/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/array-examples/sorting_bubblesort_2_ground.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-fb55353 [2019-11-06 18:39:40,691 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-06 18:39:40,693 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-06 18:39:40,710 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-11-06 18:39:40,711 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-11-06 18:39:40,713 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-11-06 18:39:40,715 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-11-06 18:39:40,727 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-11-06 18:39:40,729 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-11-06 18:39:40,731 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-11-06 18:39:40,732 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-11-06 18:39:40,733 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-11-06 18:39:40,733 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-06 18:39:40,734 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-06 18:39:40,735 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-06 18:39:40,736 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-06 18:39:40,737 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-06 18:39:40,737 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-06 18:39:40,739 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-06 18:39:40,741 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-06 18:39:40,742 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-06 18:39:40,743 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-06 18:39:40,744 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-06 18:39:40,745 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-06 18:39:40,747 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-11-06 18:39:40,754 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-06 18:39:40,757 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-06 18:39:40,758 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-06 18:39:40,758 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2019-11-06 18:39:40,779 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-06 18:39:40,779 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-06 18:39:40,781 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-06 18:39:40,781 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-06 18:39:40,781 INFO L138 SettingsManager]: * Use SBE=true [2019-11-06 18:39:40,782 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-06 18:39:40,782 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-06 18:39:40,782 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-06 18:39:40,782 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-06 18:39:40,782 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-06 18:39:40,783 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-06 18:39:40,784 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-06 18:39:40,784 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-06 18:39:40,784 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-06 18:39:40,784 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-06 18:39:40,784 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-06 18:39:40,785 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-06 18:39:40,785 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-06 18:39:40,785 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-06 18:39:40,785 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-06 18:39:40,786 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-06 18:39:40,786 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-06 18:39:40,786 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-06 18:39:40,786 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-06 18:39:40,786 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-06 18:39:40,787 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-06 18:39:40,787 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-06 18:39:40,787 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-06 18:39:40,787 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-11-06 18:39:41,040 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-06 18:39:41,057 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-06 18:39:41,061 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-06 18:39:41,062 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-06 18:39:41,062 INFO L275 PluginConnector]: CDTParser initialized [2019-11-06 18:39:41,063 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-examples/sorting_bubblesort_2_ground.i [2019-11-06 18:39:41,134 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/90357c3db/5c000d3423714a00994954c75fb83836/FLAG0a2e97b90 [2019-11-06 18:39:41,524 INFO L306 CDTParser]: Found 1 translation units. [2019-11-06 18:39:41,526 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-examples/sorting_bubblesort_2_ground.i [2019-11-06 18:39:41,532 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/90357c3db/5c000d3423714a00994954c75fb83836/FLAG0a2e97b90 [2019-11-06 18:39:41,955 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/90357c3db/5c000d3423714a00994954c75fb83836 [2019-11-06 18:39:41,965 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-06 18:39:41,968 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-11-06 18:39:41,968 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-06 18:39:41,969 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-06 18:39:41,972 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-06 18:39:41,973 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 06:39:41" (1/1) ... [2019-11-06 18:39:41,976 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4e5ac96 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:39:41, skipping insertion in model container [2019-11-06 18:39:41,976 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 06:39:41" (1/1) ... [2019-11-06 18:39:41,984 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-11-06 18:39:42,002 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-11-06 18:39:42,166 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-06 18:39:42,169 INFO L188 MainTranslator]: Completed pre-run [2019-11-06 18:39:42,191 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-06 18:39:42,206 INFO L192 MainTranslator]: Completed translation [2019-11-06 18:39:42,207 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:39:42 WrapperNode [2019-11-06 18:39:42,207 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-06 18:39:42,208 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-06 18:39:42,208 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-06 18:39:42,208 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-06 18:39:42,290 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:39:42" (1/1) ... [2019-11-06 18:39:42,290 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:39:42" (1/1) ... [2019-11-06 18:39:42,296 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:39:42" (1/1) ... [2019-11-06 18:39:42,297 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:39:42" (1/1) ... [2019-11-06 18:39:42,307 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:39:42" (1/1) ... [2019-11-06 18:39:42,312 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:39:42" (1/1) ... [2019-11-06 18:39:42,313 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:39:42" (1/1) ... [2019-11-06 18:39:42,315 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-06 18:39:42,316 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-06 18:39:42,316 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-06 18:39:42,316 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-06 18:39:42,317 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:39:42" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-06 18:39:42,381 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-11-06 18:39:42,382 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-06 18:39:42,382 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-11-06 18:39:42,382 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-11-06 18:39:42,382 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-11-06 18:39:42,382 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-11-06 18:39:42,382 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-11-06 18:39:42,382 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-11-06 18:39:42,383 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-11-06 18:39:42,383 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-11-06 18:39:42,383 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-11-06 18:39:42,383 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-11-06 18:39:42,383 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-11-06 18:39:42,383 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-06 18:39:42,684 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-06 18:39:42,684 INFO L284 CfgBuilder]: Removed 5 assume(true) statements. [2019-11-06 18:39:42,685 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 06:39:42 BoogieIcfgContainer [2019-11-06 18:39:42,685 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-06 18:39:42,686 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-06 18:39:42,686 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-06 18:39:42,689 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-06 18:39:42,690 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.11 06:39:41" (1/3) ... [2019-11-06 18:39:42,690 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@155b2915 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 06:39:42, skipping insertion in model container [2019-11-06 18:39:42,690 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:39:42" (2/3) ... [2019-11-06 18:39:42,691 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@155b2915 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 06:39:42, skipping insertion in model container [2019-11-06 18:39:42,691 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 06:39:42" (3/3) ... [2019-11-06 18:39:42,692 INFO L109 eAbstractionObserver]: Analyzing ICFG sorting_bubblesort_2_ground.i [2019-11-06 18:39:42,701 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-06 18:39:42,708 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-06 18:39:42,719 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-06 18:39:42,741 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-06 18:39:42,741 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-06 18:39:42,741 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-06 18:39:42,741 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-06 18:39:42,741 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-06 18:39:42,741 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-06 18:39:42,741 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-06 18:39:42,741 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-06 18:39:42,758 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states. [2019-11-06 18:39:42,764 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-11-06 18:39:42,764 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:39:42,765 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:39:42,767 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:39:42,772 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:39:42,772 INFO L82 PathProgramCache]: Analyzing trace with hash -1296691801, now seen corresponding path program 1 times [2019-11-06 18:39:42,781 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:39:42,782 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2060391695] [2019-11-06 18:39:42,782 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:39:42,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:39:42,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:39:42,932 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:39:42,933 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2060391695] [2019-11-06 18:39:42,933 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 18:39:42,934 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-06 18:39:42,934 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [313727180] [2019-11-06 18:39:42,939 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-06 18:39:42,939 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:39:42,953 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-06 18:39:42,954 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-06 18:39:42,955 INFO L87 Difference]: Start difference. First operand 31 states. Second operand 3 states. [2019-11-06 18:39:43,066 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:39:43,066 INFO L93 Difference]: Finished difference Result 54 states and 75 transitions. [2019-11-06 18:39:43,067 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-06 18:39:43,068 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 16 [2019-11-06 18:39:43,069 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:39:43,077 INFO L225 Difference]: With dead ends: 54 [2019-11-06 18:39:43,077 INFO L226 Difference]: Without dead ends: 26 [2019-11-06 18:39:43,080 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-06 18:39:43,098 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2019-11-06 18:39:43,117 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2019-11-06 18:39:43,118 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2019-11-06 18:39:43,120 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 31 transitions. [2019-11-06 18:39:43,121 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 31 transitions. Word has length 16 [2019-11-06 18:39:43,122 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:39:43,122 INFO L462 AbstractCegarLoop]: Abstraction has 26 states and 31 transitions. [2019-11-06 18:39:43,122 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-06 18:39:43,122 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 31 transitions. [2019-11-06 18:39:43,123 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-11-06 18:39:43,123 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:39:43,124 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:39:43,124 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:39:43,125 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:39:43,125 INFO L82 PathProgramCache]: Analyzing trace with hash -1547542812, now seen corresponding path program 1 times [2019-11-06 18:39:43,125 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:39:43,125 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [370068135] [2019-11-06 18:39:43,126 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:39:43,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:39:43,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:39:43,223 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:39:43,226 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [370068135] [2019-11-06 18:39:43,226 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 18:39:43,226 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-11-06 18:39:43,227 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [922099316] [2019-11-06 18:39:43,229 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-06 18:39:43,229 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:39:43,229 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-06 18:39:43,231 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-11-06 18:39:43,231 INFO L87 Difference]: Start difference. First operand 26 states and 31 transitions. Second operand 4 states. [2019-11-06 18:39:43,328 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:39:43,329 INFO L93 Difference]: Finished difference Result 46 states and 56 transitions. [2019-11-06 18:39:43,329 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-06 18:39:43,330 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 16 [2019-11-06 18:39:43,330 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:39:43,331 INFO L225 Difference]: With dead ends: 46 [2019-11-06 18:39:43,331 INFO L226 Difference]: Without dead ends: 28 [2019-11-06 18:39:43,333 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-11-06 18:39:43,333 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2019-11-06 18:39:43,344 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2019-11-06 18:39:43,344 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2019-11-06 18:39:43,346 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 32 transitions. [2019-11-06 18:39:43,346 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 32 transitions. Word has length 16 [2019-11-06 18:39:43,347 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:39:43,347 INFO L462 AbstractCegarLoop]: Abstraction has 27 states and 32 transitions. [2019-11-06 18:39:43,347 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-06 18:39:43,347 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 32 transitions. [2019-11-06 18:39:43,349 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2019-11-06 18:39:43,349 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:39:43,350 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:39:43,350 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:39:43,351 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:39:43,352 INFO L82 PathProgramCache]: Analyzing trace with hash -1387426810, now seen corresponding path program 1 times [2019-11-06 18:39:43,352 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:39:43,352 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [174769773] [2019-11-06 18:39:43,353 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:39:43,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:39:43,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:39:43,448 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-06 18:39:43,449 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [174769773] [2019-11-06 18:39:43,449 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 18:39:43,449 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-11-06 18:39:43,450 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2135726989] [2019-11-06 18:39:43,450 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-06 18:39:43,450 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:39:43,451 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-06 18:39:43,451 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-11-06 18:39:43,451 INFO L87 Difference]: Start difference. First operand 27 states and 32 transitions. Second operand 4 states. [2019-11-06 18:39:43,523 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:39:43,524 INFO L93 Difference]: Finished difference Result 44 states and 53 transitions. [2019-11-06 18:39:43,524 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-06 18:39:43,524 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 18 [2019-11-06 18:39:43,524 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:39:43,525 INFO L225 Difference]: With dead ends: 44 [2019-11-06 18:39:43,525 INFO L226 Difference]: Without dead ends: 31 [2019-11-06 18:39:43,526 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-11-06 18:39:43,526 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2019-11-06 18:39:43,531 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2019-11-06 18:39:43,532 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2019-11-06 18:39:43,533 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 38 transitions. [2019-11-06 18:39:43,533 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 38 transitions. Word has length 18 [2019-11-06 18:39:43,533 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:39:43,533 INFO L462 AbstractCegarLoop]: Abstraction has 31 states and 38 transitions. [2019-11-06 18:39:43,534 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-06 18:39:43,534 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 38 transitions. [2019-11-06 18:39:43,534 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2019-11-06 18:39:43,535 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:39:43,535 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:39:43,535 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:39:43,535 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:39:43,536 INFO L82 PathProgramCache]: Analyzing trace with hash 1108929549, now seen corresponding path program 1 times [2019-11-06 18:39:43,536 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:39:43,536 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1960706764] [2019-11-06 18:39:43,536 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:39:43,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:39:43,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:39:43,584 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-06 18:39:43,584 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1960706764] [2019-11-06 18:39:43,585 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 18:39:43,585 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-11-06 18:39:43,585 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [218567792] [2019-11-06 18:39:43,586 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-06 18:39:43,586 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:39:43,586 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-06 18:39:43,586 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-11-06 18:39:43,587 INFO L87 Difference]: Start difference. First operand 31 states and 38 transitions. Second operand 4 states. [2019-11-06 18:39:43,665 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:39:43,666 INFO L93 Difference]: Finished difference Result 56 states and 71 transitions. [2019-11-06 18:39:43,666 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-06 18:39:43,666 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 20 [2019-11-06 18:39:43,667 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:39:43,667 INFO L225 Difference]: With dead ends: 56 [2019-11-06 18:39:43,667 INFO L226 Difference]: Without dead ends: 35 [2019-11-06 18:39:43,668 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-11-06 18:39:43,669 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2019-11-06 18:39:43,673 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 32. [2019-11-06 18:39:43,674 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2019-11-06 18:39:43,675 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 39 transitions. [2019-11-06 18:39:43,675 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 39 transitions. Word has length 20 [2019-11-06 18:39:43,675 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:39:43,675 INFO L462 AbstractCegarLoop]: Abstraction has 32 states and 39 transitions. [2019-11-06 18:39:43,676 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-06 18:39:43,676 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 39 transitions. [2019-11-06 18:39:43,676 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2019-11-06 18:39:43,677 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:39:43,677 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:39:43,677 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:39:43,677 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:39:43,678 INFO L82 PathProgramCache]: Analyzing trace with hash -2055572838, now seen corresponding path program 1 times [2019-11-06 18:39:43,678 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:39:43,678 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1083076221] [2019-11-06 18:39:43,678 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:39:43,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:39:43,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:39:43,753 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-06 18:39:43,754 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1083076221] [2019-11-06 18:39:43,754 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1624853721] [2019-11-06 18:39:43,754 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:39:43,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:39:43,817 INFO L256 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-06 18:39:43,825 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:39:43,861 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-06 18:39:43,862 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:39:43,862 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2019-11-06 18:39:43,863 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1387748735] [2019-11-06 18:39:43,864 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-11-06 18:39:43,864 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:39:43,865 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-11-06 18:39:43,865 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-11-06 18:39:43,865 INFO L87 Difference]: Start difference. First operand 32 states and 39 transitions. Second operand 6 states. [2019-11-06 18:39:43,932 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:39:43,932 INFO L93 Difference]: Finished difference Result 58 states and 72 transitions. [2019-11-06 18:39:43,932 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-11-06 18:39:43,932 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 23 [2019-11-06 18:39:43,933 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:39:43,933 INFO L225 Difference]: With dead ends: 58 [2019-11-06 18:39:43,934 INFO L226 Difference]: Without dead ends: 35 [2019-11-06 18:39:43,934 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-11-06 18:39:43,935 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2019-11-06 18:39:43,939 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 34. [2019-11-06 18:39:43,939 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2019-11-06 18:39:43,940 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 41 transitions. [2019-11-06 18:39:43,940 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 41 transitions. Word has length 23 [2019-11-06 18:39:43,940 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:39:43,940 INFO L462 AbstractCegarLoop]: Abstraction has 34 states and 41 transitions. [2019-11-06 18:39:43,940 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-11-06 18:39:43,941 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 41 transitions. [2019-11-06 18:39:43,941 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2019-11-06 18:39:43,941 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:39:43,942 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:39:44,145 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:39:44,145 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:39:44,145 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:39:44,145 INFO L82 PathProgramCache]: Analyzing trace with hash 442145592, now seen corresponding path program 2 times [2019-11-06 18:39:44,146 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:39:44,146 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [109078020] [2019-11-06 18:39:44,146 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:39:44,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:39:44,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:39:44,230 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-06 18:39:44,230 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [109078020] [2019-11-06 18:39:44,231 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1304043177] [2019-11-06 18:39:44,231 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:39:44,281 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 18:39:44,282 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:39:44,283 INFO L256 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 4 conjunts are in the unsatisfiable core [2019-11-06 18:39:44,285 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:39:44,304 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-06 18:39:44,305 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:39:44,305 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2019-11-06 18:39:44,305 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [68807144] [2019-11-06 18:39:44,306 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-11-06 18:39:44,306 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:39:44,306 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-11-06 18:39:44,307 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-11-06 18:39:44,307 INFO L87 Difference]: Start difference. First operand 34 states and 41 transitions. Second operand 7 states. [2019-11-06 18:39:44,375 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:39:44,376 INFO L93 Difference]: Finished difference Result 60 states and 74 transitions. [2019-11-06 18:39:44,376 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-11-06 18:39:44,377 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 25 [2019-11-06 18:39:44,377 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:39:44,377 INFO L225 Difference]: With dead ends: 60 [2019-11-06 18:39:44,378 INFO L226 Difference]: Without dead ends: 37 [2019-11-06 18:39:44,378 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-11-06 18:39:44,379 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2019-11-06 18:39:44,388 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 36. [2019-11-06 18:39:44,391 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2019-11-06 18:39:44,391 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 43 transitions. [2019-11-06 18:39:44,392 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 43 transitions. Word has length 25 [2019-11-06 18:39:44,392 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:39:44,392 INFO L462 AbstractCegarLoop]: Abstraction has 36 states and 43 transitions. [2019-11-06 18:39:44,392 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-11-06 18:39:44,392 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 43 transitions. [2019-11-06 18:39:44,393 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2019-11-06 18:39:44,393 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:39:44,393 INFO L410 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:39:44,594 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:39:44,594 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:39:44,595 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:39:44,595 INFO L82 PathProgramCache]: Analyzing trace with hash -137161642, now seen corresponding path program 3 times [2019-11-06 18:39:44,595 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:39:44,596 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1502390395] [2019-11-06 18:39:44,596 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:39:44,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:39:44,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:39:44,670 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-06 18:39:44,670 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1502390395] [2019-11-06 18:39:44,671 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [186104205] [2019-11-06 18:39:44,671 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:39:44,711 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-11-06 18:39:44,711 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:39:44,712 INFO L256 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-06 18:39:44,714 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:39:44,740 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-11-06 18:39:44,741 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:39:44,741 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 4] total 9 [2019-11-06 18:39:44,741 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2019201711] [2019-11-06 18:39:44,742 INFO L442 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-11-06 18:39:44,742 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:39:44,742 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-11-06 18:39:44,743 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2019-11-06 18:39:44,743 INFO L87 Difference]: Start difference. First operand 36 states and 43 transitions. Second operand 9 states. [2019-11-06 18:39:44,872 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:39:44,873 INFO L93 Difference]: Finished difference Result 71 states and 90 transitions. [2019-11-06 18:39:44,873 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-11-06 18:39:44,873 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 27 [2019-11-06 18:39:44,873 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:39:44,874 INFO L225 Difference]: With dead ends: 71 [2019-11-06 18:39:44,874 INFO L226 Difference]: Without dead ends: 48 [2019-11-06 18:39:44,875 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2019-11-06 18:39:44,875 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2019-11-06 18:39:44,881 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 43. [2019-11-06 18:39:44,881 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2019-11-06 18:39:44,882 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 51 transitions. [2019-11-06 18:39:44,882 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 51 transitions. Word has length 27 [2019-11-06 18:39:44,882 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:39:44,882 INFO L462 AbstractCegarLoop]: Abstraction has 43 states and 51 transitions. [2019-11-06 18:39:44,882 INFO L463 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-11-06 18:39:44,882 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 51 transitions. [2019-11-06 18:39:44,883 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2019-11-06 18:39:44,883 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:39:44,884 INFO L410 BasicCegarLoop]: trace histogram [4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:39:45,084 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:39:45,085 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:39:45,085 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:39:45,085 INFO L82 PathProgramCache]: Analyzing trace with hash -890436781, now seen corresponding path program 4 times [2019-11-06 18:39:45,086 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:39:45,086 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [949318348] [2019-11-06 18:39:45,086 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:39:45,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:39:45,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:39:45,206 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-11-06 18:39:45,207 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [949318348] [2019-11-06 18:39:45,207 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [203186085] [2019-11-06 18:39:45,207 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:39:45,258 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-06 18:39:45,259 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:39:45,259 INFO L256 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 6 conjunts are in the unsatisfiable core [2019-11-06 18:39:45,265 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:39:45,292 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-11-06 18:39:45,292 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:39:45,293 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2019-11-06 18:39:45,293 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1816752489] [2019-11-06 18:39:45,294 INFO L442 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-11-06 18:39:45,294 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:39:45,294 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-11-06 18:39:45,294 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2019-11-06 18:39:45,295 INFO L87 Difference]: Start difference. First operand 43 states and 51 transitions. Second operand 9 states. [2019-11-06 18:39:45,385 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:39:45,385 INFO L93 Difference]: Finished difference Result 74 states and 90 transitions. [2019-11-06 18:39:45,386 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-11-06 18:39:45,386 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 32 [2019-11-06 18:39:45,386 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:39:45,387 INFO L225 Difference]: With dead ends: 74 [2019-11-06 18:39:45,387 INFO L226 Difference]: Without dead ends: 46 [2019-11-06 18:39:45,388 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2019-11-06 18:39:45,388 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2019-11-06 18:39:45,393 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2019-11-06 18:39:45,394 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2019-11-06 18:39:45,394 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 53 transitions. [2019-11-06 18:39:45,395 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 53 transitions. Word has length 32 [2019-11-06 18:39:45,395 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:39:45,395 INFO L462 AbstractCegarLoop]: Abstraction has 45 states and 53 transitions. [2019-11-06 18:39:45,395 INFO L463 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-11-06 18:39:45,395 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 53 transitions. [2019-11-06 18:39:45,396 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2019-11-06 18:39:45,397 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:39:45,397 INFO L410 BasicCegarLoop]: trace histogram [5, 5, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:39:45,608 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:39:45,608 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:39:45,609 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:39:45,609 INFO L82 PathProgramCache]: Analyzing trace with hash -250762123, now seen corresponding path program 5 times [2019-11-06 18:39:45,610 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:39:45,610 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [238337234] [2019-11-06 18:39:45,611 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:39:45,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:39:45,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:39:45,743 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-11-06 18:39:45,744 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [238337234] [2019-11-06 18:39:45,744 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1593444327] [2019-11-06 18:39:45,744 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:39:45,785 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2019-11-06 18:39:45,786 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:39:45,787 INFO L256 TraceCheckSpWp]: Trace formula consists of 54 conjuncts, 4 conjunts are in the unsatisfiable core [2019-11-06 18:39:45,789 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:39:45,829 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2019-11-06 18:39:45,830 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:39:45,830 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 5] total 12 [2019-11-06 18:39:45,831 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [338128697] [2019-11-06 18:39:45,831 INFO L442 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-11-06 18:39:45,832 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:39:45,832 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-11-06 18:39:45,832 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=93, Unknown=0, NotChecked=0, Total=132 [2019-11-06 18:39:45,832 INFO L87 Difference]: Start difference. First operand 45 states and 53 transitions. Second operand 12 states. [2019-11-06 18:39:45,946 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:39:45,946 INFO L93 Difference]: Finished difference Result 86 states and 108 transitions. [2019-11-06 18:39:45,947 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-11-06 18:39:45,947 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 34 [2019-11-06 18:39:45,948 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:39:45,950 INFO L225 Difference]: With dead ends: 86 [2019-11-06 18:39:45,951 INFO L226 Difference]: Without dead ends: 58 [2019-11-06 18:39:45,951 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=39, Invalid=93, Unknown=0, NotChecked=0, Total=132 [2019-11-06 18:39:45,953 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2019-11-06 18:39:45,959 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 53. [2019-11-06 18:39:45,962 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2019-11-06 18:39:45,963 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 63 transitions. [2019-11-06 18:39:45,963 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 63 transitions. Word has length 34 [2019-11-06 18:39:45,963 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:39:45,963 INFO L462 AbstractCegarLoop]: Abstraction has 53 states and 63 transitions. [2019-11-06 18:39:45,963 INFO L463 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-11-06 18:39:45,964 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 63 transitions. [2019-11-06 18:39:45,964 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2019-11-06 18:39:45,965 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:39:45,966 INFO L410 BasicCegarLoop]: trace histogram [6, 6, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:39:46,169 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:39:46,169 INFO L410 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:39:46,169 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:39:46,170 INFO L82 PathProgramCache]: Analyzing trace with hash -1537034928, now seen corresponding path program 6 times [2019-11-06 18:39:46,170 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:39:46,170 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1455174004] [2019-11-06 18:39:46,171 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:39:46,187 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:39:46,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:39:46,282 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2019-11-06 18:39:46,283 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1455174004] [2019-11-06 18:39:46,283 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1530240431] [2019-11-06 18:39:46,283 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:39:46,344 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2019-11-06 18:39:46,344 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:39:46,346 INFO L256 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 5 conjunts are in the unsatisfiable core [2019-11-06 18:39:46,348 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:39:46,400 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 1 proven. 12 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2019-11-06 18:39:46,401 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:39:46,401 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 6] total 14 [2019-11-06 18:39:46,401 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1576518313] [2019-11-06 18:39:46,402 INFO L442 AbstractCegarLoop]: Interpolant automaton has 14 states [2019-11-06 18:39:46,402 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:39:46,403 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2019-11-06 18:39:46,403 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=130, Unknown=0, NotChecked=0, Total=182 [2019-11-06 18:39:46,403 INFO L87 Difference]: Start difference. First operand 53 states and 63 transitions. Second operand 14 states. [2019-11-06 18:39:46,548 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:39:46,548 INFO L93 Difference]: Finished difference Result 100 states and 126 transitions. [2019-11-06 18:39:46,549 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-11-06 18:39:46,549 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 39 [2019-11-06 18:39:46,549 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:39:46,550 INFO L225 Difference]: With dead ends: 100 [2019-11-06 18:39:46,550 INFO L226 Difference]: Without dead ends: 66 [2019-11-06 18:39:46,551 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=52, Invalid=130, Unknown=0, NotChecked=0, Total=182 [2019-11-06 18:39:46,552 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2019-11-06 18:39:46,562 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 61. [2019-11-06 18:39:46,562 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2019-11-06 18:39:46,566 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 73 transitions. [2019-11-06 18:39:46,567 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 73 transitions. Word has length 39 [2019-11-06 18:39:46,567 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:39:46,567 INFO L462 AbstractCegarLoop]: Abstraction has 61 states and 73 transitions. [2019-11-06 18:39:46,567 INFO L463 AbstractCegarLoop]: Interpolant automaton has 14 states. [2019-11-06 18:39:46,567 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 73 transitions. [2019-11-06 18:39:46,568 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2019-11-06 18:39:46,569 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:39:46,569 INFO L410 BasicCegarLoop]: trace histogram [7, 7, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:39:46,772 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:39:46,773 INFO L410 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:39:46,773 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:39:46,773 INFO L82 PathProgramCache]: Analyzing trace with hash 747611417, now seen corresponding path program 7 times [2019-11-06 18:39:46,774 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:39:46,774 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1644919] [2019-11-06 18:39:46,774 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:39:46,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:39:46,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:39:46,869 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2019-11-06 18:39:46,869 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1644919] [2019-11-06 18:39:46,869 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2128472029] [2019-11-06 18:39:46,869 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:39:46,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:39:46,918 INFO L256 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 9 conjunts are in the unsatisfiable core [2019-11-06 18:39:46,921 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:39:46,953 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2019-11-06 18:39:46,954 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:39:46,954 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 12 [2019-11-06 18:39:46,954 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1740533305] [2019-11-06 18:39:46,956 INFO L442 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-11-06 18:39:46,956 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:39:46,957 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-11-06 18:39:46,957 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2019-11-06 18:39:46,957 INFO L87 Difference]: Start difference. First operand 61 states and 73 transitions. Second operand 12 states. [2019-11-06 18:39:47,033 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:39:47,034 INFO L93 Difference]: Finished difference Result 104 states and 128 transitions. [2019-11-06 18:39:47,034 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-11-06 18:39:47,034 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 44 [2019-11-06 18:39:47,034 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:39:47,035 INFO L225 Difference]: With dead ends: 104 [2019-11-06 18:39:47,035 INFO L226 Difference]: Without dead ends: 64 [2019-11-06 18:39:47,038 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2019-11-06 18:39:47,039 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2019-11-06 18:39:47,044 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2019-11-06 18:39:47,044 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2019-11-06 18:39:47,045 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 75 transitions. [2019-11-06 18:39:47,045 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 75 transitions. Word has length 44 [2019-11-06 18:39:47,045 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:39:47,045 INFO L462 AbstractCegarLoop]: Abstraction has 63 states and 75 transitions. [2019-11-06 18:39:47,045 INFO L463 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-11-06 18:39:47,046 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 75 transitions. [2019-11-06 18:39:47,049 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2019-11-06 18:39:47,049 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:39:47,049 INFO L410 BasicCegarLoop]: trace histogram [8, 8, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:39:47,250 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:39:47,250 INFO L410 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:39:47,251 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:39:47,251 INFO L82 PathProgramCache]: Analyzing trace with hash 1331800891, now seen corresponding path program 8 times [2019-11-06 18:39:47,251 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:39:47,252 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1005017008] [2019-11-06 18:39:47,252 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:39:47,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:39:47,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:39:47,390 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2019-11-06 18:39:47,390 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1005017008] [2019-11-06 18:39:47,391 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [438260807] [2019-11-06 18:39:47,391 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:39:47,444 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 18:39:47,444 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:39:47,447 INFO L256 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 10 conjunts are in the unsatisfiable core [2019-11-06 18:39:47,455 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:39:47,474 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2019-11-06 18:39:47,474 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:39:47,475 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 13 [2019-11-06 18:39:47,475 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1838444625] [2019-11-06 18:39:47,476 INFO L442 AbstractCegarLoop]: Interpolant automaton has 13 states [2019-11-06 18:39:47,476 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:39:47,476 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2019-11-06 18:39:47,476 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2019-11-06 18:39:47,477 INFO L87 Difference]: Start difference. First operand 63 states and 75 transitions. Second operand 13 states. [2019-11-06 18:39:47,547 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:39:47,547 INFO L93 Difference]: Finished difference Result 106 states and 130 transitions. [2019-11-06 18:39:47,548 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-11-06 18:39:47,548 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 46 [2019-11-06 18:39:47,548 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:39:47,549 INFO L225 Difference]: With dead ends: 106 [2019-11-06 18:39:47,549 INFO L226 Difference]: Without dead ends: 66 [2019-11-06 18:39:47,549 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2019-11-06 18:39:47,550 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2019-11-06 18:39:47,561 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2019-11-06 18:39:47,561 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2019-11-06 18:39:47,562 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 77 transitions. [2019-11-06 18:39:47,562 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 77 transitions. Word has length 46 [2019-11-06 18:39:47,562 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:39:47,562 INFO L462 AbstractCegarLoop]: Abstraction has 65 states and 77 transitions. [2019-11-06 18:39:47,562 INFO L463 AbstractCegarLoop]: Interpolant automaton has 13 states. [2019-11-06 18:39:47,562 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 77 transitions. [2019-11-06 18:39:47,563 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2019-11-06 18:39:47,563 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:39:47,563 INFO L410 BasicCegarLoop]: trace histogram [9, 9, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:39:47,766 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:39:47,767 INFO L410 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:39:47,767 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:39:47,767 INFO L82 PathProgramCache]: Analyzing trace with hash 97169629, now seen corresponding path program 9 times [2019-11-06 18:39:47,768 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:39:47,768 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [525620706] [2019-11-06 18:39:47,768 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:39:47,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:39:47,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:39:47,879 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2019-11-06 18:39:47,879 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [525620706] [2019-11-06 18:39:47,880 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [997939054] [2019-11-06 18:39:47,880 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:39:47,942 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2019-11-06 18:39:47,942 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:39:47,943 INFO L256 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 6 conjunts are in the unsatisfiable core [2019-11-06 18:39:47,949 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:39:48,021 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 1 proven. 22 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2019-11-06 18:39:48,022 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:39:48,022 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 7] total 18 [2019-11-06 18:39:48,022 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1961452018] [2019-11-06 18:39:48,022 INFO L442 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-11-06 18:39:48,023 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:39:48,023 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-11-06 18:39:48,023 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=218, Unknown=0, NotChecked=0, Total=306 [2019-11-06 18:39:48,023 INFO L87 Difference]: Start difference. First operand 65 states and 77 transitions. Second operand 18 states. [2019-11-06 18:39:48,177 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:39:48,177 INFO L93 Difference]: Finished difference Result 118 states and 148 transitions. [2019-11-06 18:39:48,177 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-11-06 18:39:48,177 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 48 [2019-11-06 18:39:48,178 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:39:48,178 INFO L225 Difference]: With dead ends: 118 [2019-11-06 18:39:48,178 INFO L226 Difference]: Without dead ends: 78 [2019-11-06 18:39:48,179 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=88, Invalid=218, Unknown=0, NotChecked=0, Total=306 [2019-11-06 18:39:48,179 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2019-11-06 18:39:48,184 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 73. [2019-11-06 18:39:48,184 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2019-11-06 18:39:48,185 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 87 transitions. [2019-11-06 18:39:48,185 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 87 transitions. Word has length 48 [2019-11-06 18:39:48,186 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:39:48,186 INFO L462 AbstractCegarLoop]: Abstraction has 73 states and 87 transitions. [2019-11-06 18:39:48,186 INFO L463 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-11-06 18:39:48,186 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 87 transitions. [2019-11-06 18:39:48,187 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2019-11-06 18:39:48,187 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:39:48,187 INFO L410 BasicCegarLoop]: trace histogram [10, 10, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:39:48,391 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:39:48,391 INFO L410 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:39:48,392 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:39:48,392 INFO L82 PathProgramCache]: Analyzing trace with hash 830729064, now seen corresponding path program 10 times [2019-11-06 18:39:48,392 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:39:48,393 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [537051415] [2019-11-06 18:39:48,393 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:39:48,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:39:48,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:39:48,541 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2019-11-06 18:39:48,541 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [537051415] [2019-11-06 18:39:48,541 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [351532627] [2019-11-06 18:39:48,541 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:39:48,593 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-06 18:39:48,593 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:39:48,594 INFO L256 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 12 conjunts are in the unsatisfiable core [2019-11-06 18:39:48,597 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:39:48,620 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2019-11-06 18:39:48,620 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:39:48,620 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 15 [2019-11-06 18:39:48,621 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1769930123] [2019-11-06 18:39:48,621 INFO L442 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-11-06 18:39:48,621 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:39:48,622 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-11-06 18:39:48,622 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2019-11-06 18:39:48,622 INFO L87 Difference]: Start difference. First operand 73 states and 87 transitions. Second operand 15 states. [2019-11-06 18:39:48,730 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:39:48,731 INFO L93 Difference]: Finished difference Result 122 states and 150 transitions. [2019-11-06 18:39:48,732 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-11-06 18:39:48,732 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 53 [2019-11-06 18:39:48,732 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:39:48,733 INFO L225 Difference]: With dead ends: 122 [2019-11-06 18:39:48,733 INFO L226 Difference]: Without dead ends: 76 [2019-11-06 18:39:48,734 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2019-11-06 18:39:48,734 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2019-11-06 18:39:48,742 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 75. [2019-11-06 18:39:48,742 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2019-11-06 18:39:48,743 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 89 transitions. [2019-11-06 18:39:48,743 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 89 transitions. Word has length 53 [2019-11-06 18:39:48,743 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:39:48,744 INFO L462 AbstractCegarLoop]: Abstraction has 75 states and 89 transitions. [2019-11-06 18:39:48,744 INFO L463 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-11-06 18:39:48,744 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 89 transitions. [2019-11-06 18:39:48,745 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2019-11-06 18:39:48,745 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:39:48,745 INFO L410 BasicCegarLoop]: trace histogram [11, 11, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:39:48,950 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:39:48,950 INFO L410 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:39:48,950 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:39:48,951 INFO L82 PathProgramCache]: Analyzing trace with hash 1163504518, now seen corresponding path program 11 times [2019-11-06 18:39:48,951 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:39:48,951 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2063116181] [2019-11-06 18:39:48,951 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:39:48,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:39:49,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:39:49,097 INFO L134 CoverageAnalysis]: Checked inductivity of 157 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2019-11-06 18:39:49,098 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2063116181] [2019-11-06 18:39:49,098 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1670638432] [2019-11-06 18:39:49,098 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:39:49,185 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 11 check-sat command(s) [2019-11-06 18:39:49,185 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:39:49,186 INFO L256 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 7 conjunts are in the unsatisfiable core [2019-11-06 18:39:49,188 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:39:49,287 INFO L134 CoverageAnalysis]: Checked inductivity of 157 backedges. 1 proven. 35 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2019-11-06 18:39:49,287 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:39:49,287 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 8] total 21 [2019-11-06 18:39:49,287 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1714381575] [2019-11-06 18:39:49,288 INFO L442 AbstractCegarLoop]: Interpolant automaton has 21 states [2019-11-06 18:39:49,288 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:39:49,288 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2019-11-06 18:39:49,289 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=300, Unknown=0, NotChecked=0, Total=420 [2019-11-06 18:39:49,289 INFO L87 Difference]: Start difference. First operand 75 states and 89 transitions. Second operand 21 states. [2019-11-06 18:39:49,485 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:39:49,485 INFO L93 Difference]: Finished difference Result 134 states and 168 transitions. [2019-11-06 18:39:49,485 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2019-11-06 18:39:49,485 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 55 [2019-11-06 18:39:49,486 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:39:49,486 INFO L225 Difference]: With dead ends: 134 [2019-11-06 18:39:49,486 INFO L226 Difference]: Without dead ends: 88 [2019-11-06 18:39:49,488 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=120, Invalid=300, Unknown=0, NotChecked=0, Total=420 [2019-11-06 18:39:49,488 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2019-11-06 18:39:49,498 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 83. [2019-11-06 18:39:49,498 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2019-11-06 18:39:49,498 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 99 transitions. [2019-11-06 18:39:49,499 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 99 transitions. Word has length 55 [2019-11-06 18:39:49,499 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:39:49,499 INFO L462 AbstractCegarLoop]: Abstraction has 83 states and 99 transitions. [2019-11-06 18:39:49,499 INFO L463 AbstractCegarLoop]: Interpolant automaton has 21 states. [2019-11-06 18:39:49,499 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 99 transitions. [2019-11-06 18:39:49,501 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2019-11-06 18:39:49,501 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:39:49,501 INFO L410 BasicCegarLoop]: trace histogram [12, 12, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:39:49,706 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:39:49,706 INFO L410 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:39:49,706 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:39:49,707 INFO L82 PathProgramCache]: Analyzing trace with hash -264767709, now seen corresponding path program 12 times [2019-11-06 18:39:49,707 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:39:49,707 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1834567213] [2019-11-06 18:39:49,708 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:39:49,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:39:49,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:39:49,867 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2019-11-06 18:39:49,868 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1834567213] [2019-11-06 18:39:49,868 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [881629725] [2019-11-06 18:39:49,868 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:39:50,028 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2019-11-06 18:39:50,028 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:39:50,029 INFO L256 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 8 conjunts are in the unsatisfiable core [2019-11-06 18:39:50,031 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:39:50,117 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 1 proven. 51 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2019-11-06 18:39:50,117 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:39:50,117 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 9] total 23 [2019-11-06 18:39:50,117 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1140837854] [2019-11-06 18:39:50,118 INFO L442 AbstractCegarLoop]: Interpolant automaton has 23 states [2019-11-06 18:39:50,118 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:39:50,118 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2019-11-06 18:39:50,118 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=142, Invalid=364, Unknown=0, NotChecked=0, Total=506 [2019-11-06 18:39:50,119 INFO L87 Difference]: Start difference. First operand 83 states and 99 transitions. Second operand 23 states. [2019-11-06 18:39:50,312 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:39:50,312 INFO L93 Difference]: Finished difference Result 148 states and 186 transitions. [2019-11-06 18:39:50,312 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2019-11-06 18:39:50,312 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 60 [2019-11-06 18:39:50,313 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:39:50,315 INFO L225 Difference]: With dead ends: 148 [2019-11-06 18:39:50,315 INFO L226 Difference]: Without dead ends: 96 [2019-11-06 18:39:50,316 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 55 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 96 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=142, Invalid=364, Unknown=0, NotChecked=0, Total=506 [2019-11-06 18:39:50,317 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2019-11-06 18:39:50,321 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 91. [2019-11-06 18:39:50,322 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2019-11-06 18:39:50,322 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 109 transitions. [2019-11-06 18:39:50,322 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 109 transitions. Word has length 60 [2019-11-06 18:39:50,323 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:39:50,323 INFO L462 AbstractCegarLoop]: Abstraction has 91 states and 109 transitions. [2019-11-06 18:39:50,323 INFO L463 AbstractCegarLoop]: Interpolant automaton has 23 states. [2019-11-06 18:39:50,323 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 109 transitions. [2019-11-06 18:39:50,324 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2019-11-06 18:39:50,324 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:39:50,324 INFO L410 BasicCegarLoop]: trace histogram [13, 13, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:39:50,528 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:39:50,528 INFO L410 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:39:50,529 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:39:50,529 INFO L82 PathProgramCache]: Analyzing trace with hash 980957794, now seen corresponding path program 13 times [2019-11-06 18:39:50,529 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:39:50,530 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [743793716] [2019-11-06 18:39:50,530 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:39:50,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:39:50,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:39:50,707 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 71 trivial. 0 not checked. [2019-11-06 18:39:50,707 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [743793716] [2019-11-06 18:39:50,707 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [406468763] [2019-11-06 18:39:50,708 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:39:50,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:39:50,780 INFO L256 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 15 conjunts are in the unsatisfiable core [2019-11-06 18:39:50,782 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:39:50,820 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 71 trivial. 0 not checked. [2019-11-06 18:39:50,820 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:39:50,820 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 18 [2019-11-06 18:39:50,821 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1687383298] [2019-11-06 18:39:50,821 INFO L442 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-11-06 18:39:50,822 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:39:50,822 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-11-06 18:39:50,822 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2019-11-06 18:39:50,823 INFO L87 Difference]: Start difference. First operand 91 states and 109 transitions. Second operand 18 states. [2019-11-06 18:39:50,991 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:39:50,991 INFO L93 Difference]: Finished difference Result 152 states and 188 transitions. [2019-11-06 18:39:50,992 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-11-06 18:39:50,992 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 65 [2019-11-06 18:39:50,993 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:39:50,994 INFO L225 Difference]: With dead ends: 152 [2019-11-06 18:39:50,994 INFO L226 Difference]: Without dead ends: 94 [2019-11-06 18:39:50,995 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 66 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2019-11-06 18:39:50,995 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2019-11-06 18:39:51,005 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 93. [2019-11-06 18:39:51,008 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2019-11-06 18:39:51,009 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 111 transitions. [2019-11-06 18:39:51,009 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 111 transitions. Word has length 65 [2019-11-06 18:39:51,010 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:39:51,010 INFO L462 AbstractCegarLoop]: Abstraction has 93 states and 111 transitions. [2019-11-06 18:39:51,010 INFO L463 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-11-06 18:39:51,010 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 111 transitions. [2019-11-06 18:39:51,012 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2019-11-06 18:39:51,012 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:39:51,013 INFO L410 BasicCegarLoop]: trace histogram [14, 14, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:39:51,217 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:39:51,217 INFO L410 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:39:51,217 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:39:51,218 INFO L82 PathProgramCache]: Analyzing trace with hash 1862843776, now seen corresponding path program 14 times [2019-11-06 18:39:51,218 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:39:51,218 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1814581921] [2019-11-06 18:39:51,218 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:39:51,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:39:51,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:39:51,398 INFO L134 CoverageAnalysis]: Checked inductivity of 267 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 71 trivial. 0 not checked. [2019-11-06 18:39:51,398 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1814581921] [2019-11-06 18:39:51,398 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [484355195] [2019-11-06 18:39:51,398 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:39:51,464 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 18:39:51,465 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:39:51,466 INFO L256 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 16 conjunts are in the unsatisfiable core [2019-11-06 18:39:51,467 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:39:51,495 INFO L134 CoverageAnalysis]: Checked inductivity of 267 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 71 trivial. 0 not checked. [2019-11-06 18:39:51,496 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:39:51,496 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 19 [2019-11-06 18:39:51,496 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1668960796] [2019-11-06 18:39:51,496 INFO L442 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-11-06 18:39:51,497 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:39:51,497 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-11-06 18:39:51,497 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2019-11-06 18:39:51,498 INFO L87 Difference]: Start difference. First operand 93 states and 111 transitions. Second operand 19 states. [2019-11-06 18:39:51,641 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:39:51,642 INFO L93 Difference]: Finished difference Result 154 states and 190 transitions. [2019-11-06 18:39:51,642 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-11-06 18:39:51,642 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 67 [2019-11-06 18:39:51,642 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:39:51,643 INFO L225 Difference]: With dead ends: 154 [2019-11-06 18:39:51,643 INFO L226 Difference]: Without dead ends: 96 [2019-11-06 18:39:51,644 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 68 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2019-11-06 18:39:51,644 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2019-11-06 18:39:51,648 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 95. [2019-11-06 18:39:51,648 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2019-11-06 18:39:51,649 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 113 transitions. [2019-11-06 18:39:51,649 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 113 transitions. Word has length 67 [2019-11-06 18:39:51,649 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:39:51,649 INFO L462 AbstractCegarLoop]: Abstraction has 95 states and 113 transitions. [2019-11-06 18:39:51,650 INFO L463 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-11-06 18:39:51,650 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 113 transitions. [2019-11-06 18:39:51,650 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2019-11-06 18:39:51,650 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:39:51,651 INFO L410 BasicCegarLoop]: trace histogram [15, 15, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:39:51,853 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:39:51,854 INFO L410 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:39:51,854 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:39:51,854 INFO L82 PathProgramCache]: Analyzing trace with hash -1048252130, now seen corresponding path program 15 times [2019-11-06 18:39:51,855 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:39:51,855 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [962915885] [2019-11-06 18:39:51,855 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:39:51,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:39:52,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:39:52,054 INFO L134 CoverageAnalysis]: Checked inductivity of 296 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 71 trivial. 0 not checked. [2019-11-06 18:39:52,055 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [962915885] [2019-11-06 18:39:52,055 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1205983632] [2019-11-06 18:39:52,055 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:39:52,182 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2019-11-06 18:39:52,182 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:39:52,184 INFO L256 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 9 conjunts are in the unsatisfiable core [2019-11-06 18:39:52,186 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:39:52,347 INFO L134 CoverageAnalysis]: Checked inductivity of 296 backedges. 1 proven. 70 refuted. 0 times theorem prover too weak. 225 trivial. 0 not checked. [2019-11-06 18:39:52,347 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:39:52,347 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 10] total 27 [2019-11-06 18:39:52,348 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [361696771] [2019-11-06 18:39:52,349 INFO L442 AbstractCegarLoop]: Interpolant automaton has 27 states [2019-11-06 18:39:52,349 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:39:52,350 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2019-11-06 18:39:52,350 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=199, Invalid=503, Unknown=0, NotChecked=0, Total=702 [2019-11-06 18:39:52,350 INFO L87 Difference]: Start difference. First operand 95 states and 113 transitions. Second operand 27 states. [2019-11-06 18:39:52,554 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:39:52,554 INFO L93 Difference]: Finished difference Result 166 states and 208 transitions. [2019-11-06 18:39:52,554 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2019-11-06 18:39:52,555 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 69 [2019-11-06 18:39:52,555 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:39:52,556 INFO L225 Difference]: With dead ends: 166 [2019-11-06 18:39:52,556 INFO L226 Difference]: Without dead ends: 108 [2019-11-06 18:39:52,556 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 63 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 135 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=199, Invalid=503, Unknown=0, NotChecked=0, Total=702 [2019-11-06 18:39:52,559 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2019-11-06 18:39:52,563 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 103. [2019-11-06 18:39:52,563 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2019-11-06 18:39:52,564 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 123 transitions. [2019-11-06 18:39:52,564 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 123 transitions. Word has length 69 [2019-11-06 18:39:52,565 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:39:52,565 INFO L462 AbstractCegarLoop]: Abstraction has 103 states and 123 transitions. [2019-11-06 18:39:52,565 INFO L463 AbstractCegarLoop]: Interpolant automaton has 27 states. [2019-11-06 18:39:52,565 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 123 transitions. [2019-11-06 18:39:52,566 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2019-11-06 18:39:52,566 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:39:52,566 INFO L410 BasicCegarLoop]: trace histogram [16, 16, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:39:52,772 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:39:52,772 INFO L410 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:39:52,772 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:39:52,773 INFO L82 PathProgramCache]: Analyzing trace with hash -1331337461, now seen corresponding path program 16 times [2019-11-06 18:39:52,773 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:39:52,773 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [15839687] [2019-11-06 18:39:52,774 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:39:52,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:39:52,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:39:52,998 INFO L134 CoverageAnalysis]: Checked inductivity of 349 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 93 trivial. 0 not checked. [2019-11-06 18:39:52,998 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [15839687] [2019-11-06 18:39:52,998 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [640773744] [2019-11-06 18:39:52,998 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:39:53,062 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-06 18:39:53,062 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:39:53,063 INFO L256 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 10 conjunts are in the unsatisfiable core [2019-11-06 18:39:53,064 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:39:53,206 INFO L134 CoverageAnalysis]: Checked inductivity of 349 backedges. 1 proven. 92 refuted. 0 times theorem prover too weak. 256 trivial. 0 not checked. [2019-11-06 18:39:53,207 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:39:53,207 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 11] total 29 [2019-11-06 18:39:53,207 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [495585021] [2019-11-06 18:39:53,208 INFO L442 AbstractCegarLoop]: Interpolant automaton has 29 states [2019-11-06 18:39:53,208 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:39:53,208 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2019-11-06 18:39:53,209 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=227, Invalid=585, Unknown=0, NotChecked=0, Total=812 [2019-11-06 18:39:53,209 INFO L87 Difference]: Start difference. First operand 103 states and 123 transitions. Second operand 29 states. [2019-11-06 18:39:53,366 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:39:53,366 INFO L93 Difference]: Finished difference Result 180 states and 226 transitions. [2019-11-06 18:39:53,366 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2019-11-06 18:39:53,367 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 74 [2019-11-06 18:39:53,367 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:39:53,368 INFO L225 Difference]: With dead ends: 180 [2019-11-06 18:39:53,368 INFO L226 Difference]: Without dead ends: 116 [2019-11-06 18:39:53,369 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 67 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 160 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=227, Invalid=585, Unknown=0, NotChecked=0, Total=812 [2019-11-06 18:39:53,369 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2019-11-06 18:39:53,373 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 111. [2019-11-06 18:39:53,373 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 111 states. [2019-11-06 18:39:53,373 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 133 transitions. [2019-11-06 18:39:53,374 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 133 transitions. Word has length 74 [2019-11-06 18:39:53,374 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:39:53,374 INFO L462 AbstractCegarLoop]: Abstraction has 111 states and 133 transitions. [2019-11-06 18:39:53,374 INFO L463 AbstractCegarLoop]: Interpolant automaton has 29 states. [2019-11-06 18:39:53,374 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 133 transitions. [2019-11-06 18:39:53,375 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2019-11-06 18:39:53,375 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:39:53,375 INFO L410 BasicCegarLoop]: trace histogram [17, 17, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:39:53,579 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:39:53,580 INFO L410 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:39:53,580 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:39:53,580 INFO L82 PathProgramCache]: Analyzing trace with hash 261485818, now seen corresponding path program 17 times [2019-11-06 18:39:53,580 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:39:53,581 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1034323223] [2019-11-06 18:39:53,581 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:39:53,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:39:53,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:39:53,813 INFO L134 CoverageAnalysis]: Checked inductivity of 407 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 118 trivial. 0 not checked. [2019-11-06 18:39:53,813 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1034323223] [2019-11-06 18:39:53,813 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [459085156] [2019-11-06 18:39:53,814 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:39:54,112 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 17 check-sat command(s) [2019-11-06 18:39:54,112 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:39:54,114 INFO L256 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 11 conjunts are in the unsatisfiable core [2019-11-06 18:39:54,119 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:39:54,297 INFO L134 CoverageAnalysis]: Checked inductivity of 407 backedges. 1 proven. 117 refuted. 0 times theorem prover too weak. 289 trivial. 0 not checked. [2019-11-06 18:39:54,297 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:39:54,297 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 12] total 31 [2019-11-06 18:39:54,298 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1306895833] [2019-11-06 18:39:54,298 INFO L442 AbstractCegarLoop]: Interpolant automaton has 31 states [2019-11-06 18:39:54,298 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:39:54,298 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2019-11-06 18:39:54,299 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=257, Invalid=673, Unknown=0, NotChecked=0, Total=930 [2019-11-06 18:39:54,299 INFO L87 Difference]: Start difference. First operand 111 states and 133 transitions. Second operand 31 states. [2019-11-06 18:39:54,581 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:39:54,581 INFO L93 Difference]: Finished difference Result 194 states and 244 transitions. [2019-11-06 18:39:54,581 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2019-11-06 18:39:54,581 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 79 [2019-11-06 18:39:54,582 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:39:54,582 INFO L225 Difference]: With dead ends: 194 [2019-11-06 18:39:54,582 INFO L226 Difference]: Without dead ends: 124 [2019-11-06 18:39:54,583 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 71 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 187 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=257, Invalid=673, Unknown=0, NotChecked=0, Total=930 [2019-11-06 18:39:54,583 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2019-11-06 18:39:54,586 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 119. [2019-11-06 18:39:54,586 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 119 states. [2019-11-06 18:39:54,587 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 143 transitions. [2019-11-06 18:39:54,587 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 143 transitions. Word has length 79 [2019-11-06 18:39:54,587 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:39:54,587 INFO L462 AbstractCegarLoop]: Abstraction has 119 states and 143 transitions. [2019-11-06 18:39:54,588 INFO L463 AbstractCegarLoop]: Interpolant automaton has 31 states. [2019-11-06 18:39:54,588 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 143 transitions. [2019-11-06 18:39:54,588 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2019-11-06 18:39:54,589 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:39:54,589 INFO L410 BasicCegarLoop]: trace histogram [18, 18, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:39:54,797 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:39:54,797 INFO L410 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:39:54,797 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:39:54,798 INFO L82 PathProgramCache]: Analyzing trace with hash -1674935505, now seen corresponding path program 18 times [2019-11-06 18:39:54,798 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:39:54,798 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1237896767] [2019-11-06 18:39:54,798 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:39:54,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:39:55,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:39:55,042 INFO L134 CoverageAnalysis]: Checked inductivity of 470 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 146 trivial. 0 not checked. [2019-11-06 18:39:55,042 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1237896767] [2019-11-06 18:39:55,043 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [164822721] [2019-11-06 18:39:55,043 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:39:55,617 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2019-11-06 18:39:55,617 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:39:55,620 INFO L256 TraceCheckSpWp]: Trace formula consists of 255 conjuncts, 20 conjunts are in the unsatisfiable core [2019-11-06 18:39:55,621 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:39:55,651 INFO L134 CoverageAnalysis]: Checked inductivity of 470 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 146 trivial. 0 not checked. [2019-11-06 18:39:55,651 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:39:55,651 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21] total 23 [2019-11-06 18:39:55,654 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1005589401] [2019-11-06 18:39:55,654 INFO L442 AbstractCegarLoop]: Interpolant automaton has 23 states [2019-11-06 18:39:55,654 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:39:55,654 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2019-11-06 18:39:55,655 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2019-11-06 18:39:55,655 INFO L87 Difference]: Start difference. First operand 119 states and 143 transitions. Second operand 23 states. [2019-11-06 18:39:55,817 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:39:55,817 INFO L93 Difference]: Finished difference Result 198 states and 246 transitions. [2019-11-06 18:39:55,819 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2019-11-06 18:39:55,819 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 84 [2019-11-06 18:39:55,820 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:39:55,820 INFO L225 Difference]: With dead ends: 198 [2019-11-06 18:39:55,820 INFO L226 Difference]: Without dead ends: 122 [2019-11-06 18:39:55,821 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 85 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2019-11-06 18:39:55,821 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2019-11-06 18:39:55,825 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 121. [2019-11-06 18:39:55,825 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 121 states. [2019-11-06 18:39:55,826 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 145 transitions. [2019-11-06 18:39:55,826 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 145 transitions. Word has length 84 [2019-11-06 18:39:55,827 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:39:55,827 INFO L462 AbstractCegarLoop]: Abstraction has 121 states and 145 transitions. [2019-11-06 18:39:55,827 INFO L463 AbstractCegarLoop]: Interpolant automaton has 23 states. [2019-11-06 18:39:55,827 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 145 transitions. [2019-11-06 18:39:55,828 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2019-11-06 18:39:55,828 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:39:55,828 INFO L410 BasicCegarLoop]: trace histogram [19, 19, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:39:56,032 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:39:56,033 INFO L410 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:39:56,033 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:39:56,033 INFO L82 PathProgramCache]: Analyzing trace with hash 1933852497, now seen corresponding path program 19 times [2019-11-06 18:39:56,034 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:39:56,034 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1929818375] [2019-11-06 18:39:56,034 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:39:56,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:39:56,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:39:56,264 INFO L134 CoverageAnalysis]: Checked inductivity of 507 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 146 trivial. 0 not checked. [2019-11-06 18:39:56,264 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1929818375] [2019-11-06 18:39:56,264 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [567779453] [2019-11-06 18:39:56,264 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:39:56,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:39:56,336 INFO L256 TraceCheckSpWp]: Trace formula consists of 261 conjuncts, 21 conjunts are in the unsatisfiable core [2019-11-06 18:39:56,338 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:39:56,375 INFO L134 CoverageAnalysis]: Checked inductivity of 507 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 146 trivial. 0 not checked. [2019-11-06 18:39:56,376 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:39:56,376 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22] total 24 [2019-11-06 18:39:56,376 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1290526723] [2019-11-06 18:39:56,377 INFO L442 AbstractCegarLoop]: Interpolant automaton has 24 states [2019-11-06 18:39:56,377 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:39:56,377 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2019-11-06 18:39:56,378 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=255, Invalid=297, Unknown=0, NotChecked=0, Total=552 [2019-11-06 18:39:56,378 INFO L87 Difference]: Start difference. First operand 121 states and 145 transitions. Second operand 24 states. [2019-11-06 18:39:56,549 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:39:56,549 INFO L93 Difference]: Finished difference Result 200 states and 248 transitions. [2019-11-06 18:39:56,549 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2019-11-06 18:39:56,550 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 86 [2019-11-06 18:39:56,550 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:39:56,551 INFO L225 Difference]: With dead ends: 200 [2019-11-06 18:39:56,551 INFO L226 Difference]: Without dead ends: 124 [2019-11-06 18:39:56,552 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 87 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=255, Invalid=297, Unknown=0, NotChecked=0, Total=552 [2019-11-06 18:39:56,553 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2019-11-06 18:39:56,557 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 123. [2019-11-06 18:39:56,558 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 123 states. [2019-11-06 18:39:56,558 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 147 transitions. [2019-11-06 18:39:56,559 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 147 transitions. Word has length 86 [2019-11-06 18:39:56,559 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:39:56,559 INFO L462 AbstractCegarLoop]: Abstraction has 123 states and 147 transitions. [2019-11-06 18:39:56,559 INFO L463 AbstractCegarLoop]: Interpolant automaton has 24 states. [2019-11-06 18:39:56,559 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 147 transitions. [2019-11-06 18:39:56,560 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2019-11-06 18:39:56,560 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:39:56,560 INFO L410 BasicCegarLoop]: trace histogram [20, 20, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:39:56,764 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:39:56,764 INFO L410 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:39:56,765 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:39:56,765 INFO L82 PathProgramCache]: Analyzing trace with hash -354452749, now seen corresponding path program 20 times [2019-11-06 18:39:56,765 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:39:56,766 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [752508127] [2019-11-06 18:39:56,766 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:39:56,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:39:57,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:39:57,045 INFO L134 CoverageAnalysis]: Checked inductivity of 546 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 146 trivial. 0 not checked. [2019-11-06 18:39:57,045 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [752508127] [2019-11-06 18:39:57,045 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1575633333] [2019-11-06 18:39:57,045 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:39:57,142 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 18:39:57,142 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:39:57,144 INFO L256 TraceCheckSpWp]: Trace formula consists of 267 conjuncts, 22 conjunts are in the unsatisfiable core [2019-11-06 18:39:57,146 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:39:57,168 INFO L134 CoverageAnalysis]: Checked inductivity of 546 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 146 trivial. 0 not checked. [2019-11-06 18:39:57,169 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:39:57,169 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23] total 25 [2019-11-06 18:39:57,169 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [885063159] [2019-11-06 18:39:57,170 INFO L442 AbstractCegarLoop]: Interpolant automaton has 25 states [2019-11-06 18:39:57,170 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:39:57,170 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2019-11-06 18:39:57,170 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=278, Invalid=322, Unknown=0, NotChecked=0, Total=600 [2019-11-06 18:39:57,171 INFO L87 Difference]: Start difference. First operand 123 states and 147 transitions. Second operand 25 states. [2019-11-06 18:39:57,333 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:39:57,333 INFO L93 Difference]: Finished difference Result 202 states and 250 transitions. [2019-11-06 18:39:57,334 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2019-11-06 18:39:57,334 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 88 [2019-11-06 18:39:57,334 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:39:57,335 INFO L225 Difference]: With dead ends: 202 [2019-11-06 18:39:57,336 INFO L226 Difference]: Without dead ends: 126 [2019-11-06 18:39:57,337 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 89 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 58 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=278, Invalid=322, Unknown=0, NotChecked=0, Total=600 [2019-11-06 18:39:57,337 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2019-11-06 18:39:57,341 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 125. [2019-11-06 18:39:57,341 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 125 states. [2019-11-06 18:39:57,342 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 149 transitions. [2019-11-06 18:39:57,342 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 149 transitions. Word has length 88 [2019-11-06 18:39:57,342 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:39:57,342 INFO L462 AbstractCegarLoop]: Abstraction has 125 states and 149 transitions. [2019-11-06 18:39:57,342 INFO L463 AbstractCegarLoop]: Interpolant automaton has 25 states. [2019-11-06 18:39:57,342 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 149 transitions. [2019-11-06 18:39:57,343 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2019-11-06 18:39:57,343 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:39:57,343 INFO L410 BasicCegarLoop]: trace histogram [21, 21, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:39:57,547 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:39:57,547 INFO L410 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:39:57,547 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:39:57,548 INFO L82 PathProgramCache]: Analyzing trace with hash -392538603, now seen corresponding path program 21 times [2019-11-06 18:39:57,548 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:39:57,548 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1193902831] [2019-11-06 18:39:57,548 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:39:57,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:39:57,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:39:57,881 INFO L134 CoverageAnalysis]: Checked inductivity of 587 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 146 trivial. 0 not checked. [2019-11-06 18:39:57,881 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1193902831] [2019-11-06 18:39:57,881 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [820895876] [2019-11-06 18:39:57,882 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:39:58,005 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2019-11-06 18:39:58,005 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:39:58,006 INFO L256 TraceCheckSpWp]: Trace formula consists of 213 conjuncts, 12 conjunts are in the unsatisfiable core [2019-11-06 18:39:58,008 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:39:58,290 INFO L134 CoverageAnalysis]: Checked inductivity of 587 backedges. 1 proven. 145 refuted. 0 times theorem prover too weak. 441 trivial. 0 not checked. [2019-11-06 18:39:58,291 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:39:58,291 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 13] total 36 [2019-11-06 18:39:58,291 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [107729792] [2019-11-06 18:39:58,292 INFO L442 AbstractCegarLoop]: Interpolant automaton has 36 states [2019-11-06 18:39:58,292 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:39:58,293 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2019-11-06 18:39:58,294 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=355, Invalid=905, Unknown=0, NotChecked=0, Total=1260 [2019-11-06 18:39:58,294 INFO L87 Difference]: Start difference. First operand 125 states and 149 transitions. Second operand 36 states. [2019-11-06 18:39:58,576 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:39:58,576 INFO L93 Difference]: Finished difference Result 214 states and 268 transitions. [2019-11-06 18:39:58,576 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2019-11-06 18:39:58,576 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 90 [2019-11-06 18:39:58,577 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:39:58,578 INFO L225 Difference]: With dead ends: 214 [2019-11-06 18:39:58,578 INFO L226 Difference]: Without dead ends: 138 [2019-11-06 18:39:58,579 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 81 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 252 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=355, Invalid=905, Unknown=0, NotChecked=0, Total=1260 [2019-11-06 18:39:58,579 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2019-11-06 18:39:58,582 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 133. [2019-11-06 18:39:58,582 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 133 states. [2019-11-06 18:39:58,583 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 159 transitions. [2019-11-06 18:39:58,583 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 159 transitions. Word has length 90 [2019-11-06 18:39:58,583 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:39:58,584 INFO L462 AbstractCegarLoop]: Abstraction has 133 states and 159 transitions. [2019-11-06 18:39:58,584 INFO L463 AbstractCegarLoop]: Interpolant automaton has 36 states. [2019-11-06 18:39:58,584 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 159 transitions. [2019-11-06 18:39:58,584 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2019-11-06 18:39:58,585 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:39:58,585 INFO L410 BasicCegarLoop]: trace histogram [22, 22, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:39:58,788 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:39:58,789 INFO L410 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:39:58,789 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:39:58,789 INFO L82 PathProgramCache]: Analyzing trace with hash 1768371632, now seen corresponding path program 22 times [2019-11-06 18:39:58,790 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:39:58,790 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1460787229] [2019-11-06 18:39:58,790 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:39:58,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:39:59,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:39:59,121 INFO L134 CoverageAnalysis]: Checked inductivity of 661 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 177 trivial. 0 not checked. [2019-11-06 18:39:59,122 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1460787229] [2019-11-06 18:39:59,122 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1243466227] [2019-11-06 18:39:59,122 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:39:59,253 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-06 18:39:59,253 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:39:59,255 INFO L256 TraceCheckSpWp]: Trace formula consists of 287 conjuncts, 24 conjunts are in the unsatisfiable core [2019-11-06 18:39:59,258 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:39:59,293 INFO L134 CoverageAnalysis]: Checked inductivity of 661 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 177 trivial. 0 not checked. [2019-11-06 18:39:59,294 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:39:59,294 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 25] total 27 [2019-11-06 18:39:59,294 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1484460652] [2019-11-06 18:39:59,295 INFO L442 AbstractCegarLoop]: Interpolant automaton has 27 states [2019-11-06 18:39:59,295 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:39:59,295 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2019-11-06 18:39:59,296 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=327, Invalid=375, Unknown=0, NotChecked=0, Total=702 [2019-11-06 18:39:59,296 INFO L87 Difference]: Start difference. First operand 133 states and 159 transitions. Second operand 27 states. [2019-11-06 18:39:59,484 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:39:59,484 INFO L93 Difference]: Finished difference Result 218 states and 270 transitions. [2019-11-06 18:39:59,485 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2019-11-06 18:39:59,485 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 95 [2019-11-06 18:39:59,485 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:39:59,486 INFO L225 Difference]: With dead ends: 218 [2019-11-06 18:39:59,486 INFO L226 Difference]: Without dead ends: 136 [2019-11-06 18:39:59,487 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 96 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=327, Invalid=375, Unknown=0, NotChecked=0, Total=702 [2019-11-06 18:39:59,487 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2019-11-06 18:39:59,491 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 135. [2019-11-06 18:39:59,492 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 135 states. [2019-11-06 18:39:59,492 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 161 transitions. [2019-11-06 18:39:59,492 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 161 transitions. Word has length 95 [2019-11-06 18:39:59,493 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:39:59,493 INFO L462 AbstractCegarLoop]: Abstraction has 135 states and 161 transitions. [2019-11-06 18:39:59,493 INFO L463 AbstractCegarLoop]: Interpolant automaton has 27 states. [2019-11-06 18:39:59,493 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 161 transitions. [2019-11-06 18:39:59,494 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2019-11-06 18:39:59,494 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:39:59,494 INFO L410 BasicCegarLoop]: trace histogram [23, 23, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:39:59,697 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:39:59,698 INFO L410 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:39:59,698 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:39:59,698 INFO L82 PathProgramCache]: Analyzing trace with hash -742920114, now seen corresponding path program 23 times [2019-11-06 18:39:59,698 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:39:59,698 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [459236320] [2019-11-06 18:39:59,699 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:39:59,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:00,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:00,056 INFO L134 CoverageAnalysis]: Checked inductivity of 706 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 177 trivial. 0 not checked. [2019-11-06 18:40:00,056 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [459236320] [2019-11-06 18:40:00,057 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [83834595] [2019-11-06 18:40:00,057 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:00,720 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 23 check-sat command(s) [2019-11-06 18:40:00,720 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:40:00,724 INFO L256 TraceCheckSpWp]: Trace formula consists of 234 conjuncts, 13 conjunts are in the unsatisfiable core [2019-11-06 18:40:00,725 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:40:00,954 INFO L134 CoverageAnalysis]: Checked inductivity of 706 backedges. 1 proven. 176 refuted. 0 times theorem prover too weak. 529 trivial. 0 not checked. [2019-11-06 18:40:00,955 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:40:00,955 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 14] total 39 [2019-11-06 18:40:00,955 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1802978889] [2019-11-06 18:40:00,955 INFO L442 AbstractCegarLoop]: Interpolant automaton has 39 states [2019-11-06 18:40:00,955 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:40:00,956 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2019-11-06 18:40:00,956 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=417, Invalid=1065, Unknown=0, NotChecked=0, Total=1482 [2019-11-06 18:40:00,956 INFO L87 Difference]: Start difference. First operand 135 states and 161 transitions. Second operand 39 states. [2019-11-06 18:40:01,331 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:40:01,331 INFO L93 Difference]: Finished difference Result 230 states and 288 transitions. [2019-11-06 18:40:01,332 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2019-11-06 18:40:01,332 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 97 [2019-11-06 18:40:01,332 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:40:01,333 INFO L225 Difference]: With dead ends: 230 [2019-11-06 18:40:01,333 INFO L226 Difference]: Without dead ends: 148 [2019-11-06 18:40:01,334 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 87 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 299 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=417, Invalid=1065, Unknown=0, NotChecked=0, Total=1482 [2019-11-06 18:40:01,335 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2019-11-06 18:40:01,339 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 143. [2019-11-06 18:40:01,339 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 143 states. [2019-11-06 18:40:01,340 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 171 transitions. [2019-11-06 18:40:01,340 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 171 transitions. Word has length 97 [2019-11-06 18:40:01,340 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:40:01,341 INFO L462 AbstractCegarLoop]: Abstraction has 143 states and 171 transitions. [2019-11-06 18:40:01,341 INFO L463 AbstractCegarLoop]: Interpolant automaton has 39 states. [2019-11-06 18:40:01,341 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 171 transitions. [2019-11-06 18:40:01,341 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2019-11-06 18:40:01,342 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:40:01,342 INFO L410 BasicCegarLoop]: trace histogram [24, 24, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:40:01,547 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:01,547 INFO L410 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:40:01,548 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:40:01,548 INFO L82 PathProgramCache]: Analyzing trace with hash -1743015205, now seen corresponding path program 24 times [2019-11-06 18:40:01,548 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:40:01,548 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2027505334] [2019-11-06 18:40:01,549 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:40:01,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:01,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:01,941 INFO L134 CoverageAnalysis]: Checked inductivity of 787 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 211 trivial. 0 not checked. [2019-11-06 18:40:01,941 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2027505334] [2019-11-06 18:40:01,942 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [203552051] [2019-11-06 18:40:01,942 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:03,047 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 25 check-sat command(s) [2019-11-06 18:40:03,047 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:40:03,052 INFO L256 TraceCheckSpWp]: Trace formula consists of 307 conjuncts, 26 conjunts are in the unsatisfiable core [2019-11-06 18:40:03,054 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:40:03,075 INFO L134 CoverageAnalysis]: Checked inductivity of 787 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 211 trivial. 0 not checked. [2019-11-06 18:40:03,075 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:40:03,075 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 27] total 29 [2019-11-06 18:40:03,075 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [487984194] [2019-11-06 18:40:03,076 INFO L442 AbstractCegarLoop]: Interpolant automaton has 29 states [2019-11-06 18:40:03,076 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:40:03,076 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2019-11-06 18:40:03,077 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=380, Invalid=432, Unknown=0, NotChecked=0, Total=812 [2019-11-06 18:40:03,077 INFO L87 Difference]: Start difference. First operand 143 states and 171 transitions. Second operand 29 states. [2019-11-06 18:40:03,268 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:40:03,268 INFO L93 Difference]: Finished difference Result 234 states and 290 transitions. [2019-11-06 18:40:03,269 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2019-11-06 18:40:03,269 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 102 [2019-11-06 18:40:03,269 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:40:03,270 INFO L225 Difference]: With dead ends: 234 [2019-11-06 18:40:03,270 INFO L226 Difference]: Without dead ends: 146 [2019-11-06 18:40:03,271 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 103 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=380, Invalid=432, Unknown=0, NotChecked=0, Total=812 [2019-11-06 18:40:03,271 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2019-11-06 18:40:03,275 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 145. [2019-11-06 18:40:03,275 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 145 states. [2019-11-06 18:40:03,276 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 145 states to 145 states and 173 transitions. [2019-11-06 18:40:03,276 INFO L78 Accepts]: Start accepts. Automaton has 145 states and 173 transitions. Word has length 102 [2019-11-06 18:40:03,277 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:40:03,277 INFO L462 AbstractCegarLoop]: Abstraction has 145 states and 173 transitions. [2019-11-06 18:40:03,277 INFO L463 AbstractCegarLoop]: Interpolant automaton has 29 states. [2019-11-06 18:40:03,277 INFO L276 IsEmpty]: Start isEmpty. Operand 145 states and 173 transitions. [2019-11-06 18:40:03,278 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2019-11-06 18:40:03,278 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:40:03,278 INFO L410 BasicCegarLoop]: trace histogram [25, 25, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:40:03,483 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:03,483 INFO L410 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:40:03,483 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:40:03,484 INFO L82 PathProgramCache]: Analyzing trace with hash -1419810179, now seen corresponding path program 25 times [2019-11-06 18:40:03,484 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:40:03,484 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [178165628] [2019-11-06 18:40:03,485 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:40:03,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:03,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:03,836 INFO L134 CoverageAnalysis]: Checked inductivity of 836 backedges. 0 proven. 625 refuted. 0 times theorem prover too weak. 211 trivial. 0 not checked. [2019-11-06 18:40:03,836 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [178165628] [2019-11-06 18:40:03,836 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [103133467] [2019-11-06 18:40:03,836 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:03,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:03,919 INFO L256 TraceCheckSpWp]: Trace formula consists of 313 conjuncts, 27 conjunts are in the unsatisfiable core [2019-11-06 18:40:03,922 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:40:03,968 INFO L134 CoverageAnalysis]: Checked inductivity of 836 backedges. 0 proven. 625 refuted. 0 times theorem prover too weak. 211 trivial. 0 not checked. [2019-11-06 18:40:03,968 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:40:03,968 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28] total 30 [2019-11-06 18:40:03,968 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1347063445] [2019-11-06 18:40:03,969 INFO L442 AbstractCegarLoop]: Interpolant automaton has 30 states [2019-11-06 18:40:03,969 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:40:03,969 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2019-11-06 18:40:03,970 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=408, Invalid=462, Unknown=0, NotChecked=0, Total=870 [2019-11-06 18:40:03,970 INFO L87 Difference]: Start difference. First operand 145 states and 173 transitions. Second operand 30 states. [2019-11-06 18:40:04,206 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:40:04,207 INFO L93 Difference]: Finished difference Result 236 states and 292 transitions. [2019-11-06 18:40:04,207 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2019-11-06 18:40:04,207 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 104 [2019-11-06 18:40:04,207 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:40:04,208 INFO L225 Difference]: With dead ends: 236 [2019-11-06 18:40:04,208 INFO L226 Difference]: Without dead ends: 148 [2019-11-06 18:40:04,209 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 105 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 73 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=408, Invalid=462, Unknown=0, NotChecked=0, Total=870 [2019-11-06 18:40:04,210 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2019-11-06 18:40:04,213 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 147. [2019-11-06 18:40:04,214 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 147 states. [2019-11-06 18:40:04,214 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 175 transitions. [2019-11-06 18:40:04,215 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 175 transitions. Word has length 104 [2019-11-06 18:40:04,215 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:40:04,215 INFO L462 AbstractCegarLoop]: Abstraction has 147 states and 175 transitions. [2019-11-06 18:40:04,215 INFO L463 AbstractCegarLoop]: Interpolant automaton has 30 states. [2019-11-06 18:40:04,215 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 175 transitions. [2019-11-06 18:40:04,216 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2019-11-06 18:40:04,216 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:40:04,216 INFO L410 BasicCegarLoop]: trace histogram [26, 26, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:40:04,419 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:04,420 INFO L410 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:40:04,420 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:40:04,420 INFO L82 PathProgramCache]: Analyzing trace with hash -57425505, now seen corresponding path program 26 times [2019-11-06 18:40:04,421 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:40:04,421 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1256291148] [2019-11-06 18:40:04,421 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:40:04,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:04,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:04,791 INFO L134 CoverageAnalysis]: Checked inductivity of 887 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 211 trivial. 0 not checked. [2019-11-06 18:40:04,791 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1256291148] [2019-11-06 18:40:04,791 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2146365039] [2019-11-06 18:40:04,791 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:04,876 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 18:40:04,876 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:40:04,877 INFO L256 TraceCheckSpWp]: Trace formula consists of 319 conjuncts, 28 conjunts are in the unsatisfiable core [2019-11-06 18:40:04,879 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:40:04,921 INFO L134 CoverageAnalysis]: Checked inductivity of 887 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 211 trivial. 0 not checked. [2019-11-06 18:40:04,922 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:40:04,922 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 29] total 31 [2019-11-06 18:40:04,922 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [35313700] [2019-11-06 18:40:04,923 INFO L442 AbstractCegarLoop]: Interpolant automaton has 31 states [2019-11-06 18:40:04,923 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:40:04,923 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2019-11-06 18:40:04,924 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=437, Invalid=493, Unknown=0, NotChecked=0, Total=930 [2019-11-06 18:40:04,924 INFO L87 Difference]: Start difference. First operand 147 states and 175 transitions. Second operand 31 states. [2019-11-06 18:40:05,100 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:40:05,100 INFO L93 Difference]: Finished difference Result 238 states and 294 transitions. [2019-11-06 18:40:05,100 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2019-11-06 18:40:05,100 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 106 [2019-11-06 18:40:05,101 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:40:05,101 INFO L225 Difference]: With dead ends: 238 [2019-11-06 18:40:05,101 INFO L226 Difference]: Without dead ends: 150 [2019-11-06 18:40:05,102 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 107 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=437, Invalid=493, Unknown=0, NotChecked=0, Total=930 [2019-11-06 18:40:05,102 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2019-11-06 18:40:05,106 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 149. [2019-11-06 18:40:05,106 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 149 states. [2019-11-06 18:40:05,107 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 177 transitions. [2019-11-06 18:40:05,107 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 177 transitions. Word has length 106 [2019-11-06 18:40:05,107 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:40:05,107 INFO L462 AbstractCegarLoop]: Abstraction has 149 states and 177 transitions. [2019-11-06 18:40:05,107 INFO L463 AbstractCegarLoop]: Interpolant automaton has 31 states. [2019-11-06 18:40:05,107 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 177 transitions. [2019-11-06 18:40:05,108 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2019-11-06 18:40:05,108 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:40:05,108 INFO L410 BasicCegarLoop]: trace histogram [27, 27, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:40:05,311 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:05,312 INFO L410 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:40:05,312 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:40:05,313 INFO L82 PathProgramCache]: Analyzing trace with hash -770779071, now seen corresponding path program 27 times [2019-11-06 18:40:05,314 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:40:05,314 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [682996263] [2019-11-06 18:40:05,314 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:40:05,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:05,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:05,814 INFO L134 CoverageAnalysis]: Checked inductivity of 940 backedges. 0 proven. 729 refuted. 0 times theorem prover too weak. 211 trivial. 0 not checked. [2019-11-06 18:40:05,814 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [682996263] [2019-11-06 18:40:05,814 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [742428594] [2019-11-06 18:40:05,814 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:06,070 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2019-11-06 18:40:06,070 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:40:06,072 INFO L256 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 14 conjunts are in the unsatisfiable core [2019-11-06 18:40:06,074 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:40:06,462 INFO L134 CoverageAnalysis]: Checked inductivity of 940 backedges. 1 proven. 210 refuted. 0 times theorem prover too weak. 729 trivial. 0 not checked. [2019-11-06 18:40:06,463 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:40:06,463 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 15] total 44 [2019-11-06 18:40:06,463 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1628016491] [2019-11-06 18:40:06,464 INFO L442 AbstractCegarLoop]: Interpolant automaton has 44 states [2019-11-06 18:40:06,464 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:40:06,464 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2019-11-06 18:40:06,466 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=541, Invalid=1351, Unknown=0, NotChecked=0, Total=1892 [2019-11-06 18:40:06,466 INFO L87 Difference]: Start difference. First operand 149 states and 177 transitions. Second operand 44 states. [2019-11-06 18:40:06,844 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:40:06,844 INFO L93 Difference]: Finished difference Result 250 states and 312 transitions. [2019-11-06 18:40:06,844 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2019-11-06 18:40:06,844 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 108 [2019-11-06 18:40:06,845 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:40:06,846 INFO L225 Difference]: With dead ends: 250 [2019-11-06 18:40:06,846 INFO L226 Difference]: Without dead ends: 162 [2019-11-06 18:40:06,848 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 97 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 378 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=541, Invalid=1351, Unknown=0, NotChecked=0, Total=1892 [2019-11-06 18:40:06,848 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2019-11-06 18:40:06,852 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 157. [2019-11-06 18:40:06,852 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 157 states. [2019-11-06 18:40:06,853 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 187 transitions. [2019-11-06 18:40:06,853 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 187 transitions. Word has length 108 [2019-11-06 18:40:06,853 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:40:06,853 INFO L462 AbstractCegarLoop]: Abstraction has 157 states and 187 transitions. [2019-11-06 18:40:06,854 INFO L463 AbstractCegarLoop]: Interpolant automaton has 44 states. [2019-11-06 18:40:06,854 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 187 transitions. [2019-11-06 18:40:06,854 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2019-11-06 18:40:06,854 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:40:06,855 INFO L410 BasicCegarLoop]: trace histogram [28, 28, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:40:07,058 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:07,059 INFO L410 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:40:07,059 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:40:07,059 INFO L82 PathProgramCache]: Analyzing trace with hash 1597532292, now seen corresponding path program 28 times [2019-11-06 18:40:07,060 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:40:07,060 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1863378255] [2019-11-06 18:40:07,060 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:40:07,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:07,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:07,479 INFO L134 CoverageAnalysis]: Checked inductivity of 1032 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 248 trivial. 0 not checked. [2019-11-06 18:40:07,480 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1863378255] [2019-11-06 18:40:07,480 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1555185539] [2019-11-06 18:40:07,480 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:07,577 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-06 18:40:07,577 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:40:07,579 INFO L256 TraceCheckSpWp]: Trace formula consists of 339 conjuncts, 30 conjunts are in the unsatisfiable core [2019-11-06 18:40:07,580 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:40:07,603 INFO L134 CoverageAnalysis]: Checked inductivity of 1032 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 248 trivial. 0 not checked. [2019-11-06 18:40:07,604 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:40:07,604 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 31] total 33 [2019-11-06 18:40:07,604 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [683115823] [2019-11-06 18:40:07,605 INFO L442 AbstractCegarLoop]: Interpolant automaton has 33 states [2019-11-06 18:40:07,605 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:40:07,605 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2019-11-06 18:40:07,606 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=498, Invalid=558, Unknown=0, NotChecked=0, Total=1056 [2019-11-06 18:40:07,606 INFO L87 Difference]: Start difference. First operand 157 states and 187 transitions. Second operand 33 states. [2019-11-06 18:40:07,784 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:40:07,784 INFO L93 Difference]: Finished difference Result 254 states and 314 transitions. [2019-11-06 18:40:07,785 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2019-11-06 18:40:07,785 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 113 [2019-11-06 18:40:07,785 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:40:07,786 INFO L225 Difference]: With dead ends: 254 [2019-11-06 18:40:07,786 INFO L226 Difference]: Without dead ends: 160 [2019-11-06 18:40:07,788 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 145 GetRequests, 114 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 82 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=498, Invalid=558, Unknown=0, NotChecked=0, Total=1056 [2019-11-06 18:40:07,788 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2019-11-06 18:40:07,792 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 159. [2019-11-06 18:40:07,793 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 159 states. [2019-11-06 18:40:07,794 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 159 states to 159 states and 189 transitions. [2019-11-06 18:40:07,794 INFO L78 Accepts]: Start accepts. Automaton has 159 states and 189 transitions. Word has length 113 [2019-11-06 18:40:07,794 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:40:07,794 INFO L462 AbstractCegarLoop]: Abstraction has 159 states and 189 transitions. [2019-11-06 18:40:07,794 INFO L463 AbstractCegarLoop]: Interpolant automaton has 33 states. [2019-11-06 18:40:07,795 INFO L276 IsEmpty]: Start isEmpty. Operand 159 states and 189 transitions. [2019-11-06 18:40:07,795 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2019-11-06 18:40:07,795 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:40:07,796 INFO L410 BasicCegarLoop]: trace histogram [29, 29, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:40:08,000 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:08,000 INFO L410 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:40:08,000 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:40:08,000 INFO L82 PathProgramCache]: Analyzing trace with hash -1883834462, now seen corresponding path program 29 times [2019-11-06 18:40:08,001 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:40:08,001 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [73548873] [2019-11-06 18:40:08,001 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:40:08,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:08,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:08,560 INFO L134 CoverageAnalysis]: Checked inductivity of 1089 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 248 trivial. 0 not checked. [2019-11-06 18:40:08,560 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [73548873] [2019-11-06 18:40:08,560 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1998084184] [2019-11-06 18:40:08,560 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:09,356 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 29 check-sat command(s) [2019-11-06 18:40:09,357 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:40:09,361 INFO L256 TraceCheckSpWp]: Trace formula consists of 286 conjuncts, 15 conjunts are in the unsatisfiable core [2019-11-06 18:40:09,363 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:40:09,676 INFO L134 CoverageAnalysis]: Checked inductivity of 1089 backedges. 1 proven. 247 refuted. 0 times theorem prover too weak. 841 trivial. 0 not checked. [2019-11-06 18:40:09,676 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:40:09,677 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 16] total 47 [2019-11-06 18:40:09,677 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1753174954] [2019-11-06 18:40:09,677 INFO L442 AbstractCegarLoop]: Interpolant automaton has 47 states [2019-11-06 18:40:09,677 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:40:09,678 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2019-11-06 18:40:09,678 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=617, Invalid=1545, Unknown=0, NotChecked=0, Total=2162 [2019-11-06 18:40:09,678 INFO L87 Difference]: Start difference. First operand 159 states and 189 transitions. Second operand 47 states. [2019-11-06 18:40:09,933 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:40:09,933 INFO L93 Difference]: Finished difference Result 266 states and 332 transitions. [2019-11-06 18:40:09,934 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2019-11-06 18:40:09,934 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 115 [2019-11-06 18:40:09,934 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:40:09,936 INFO L225 Difference]: With dead ends: 266 [2019-11-06 18:40:09,936 INFO L226 Difference]: Without dead ends: 172 [2019-11-06 18:40:09,937 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 103 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 435 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=617, Invalid=1545, Unknown=0, NotChecked=0, Total=2162 [2019-11-06 18:40:09,937 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2019-11-06 18:40:09,941 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 167. [2019-11-06 18:40:09,941 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 167 states. [2019-11-06 18:40:09,942 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 199 transitions. [2019-11-06 18:40:09,943 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 199 transitions. Word has length 115 [2019-11-06 18:40:09,943 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:40:09,943 INFO L462 AbstractCegarLoop]: Abstraction has 167 states and 199 transitions. [2019-11-06 18:40:09,943 INFO L463 AbstractCegarLoop]: Interpolant automaton has 47 states. [2019-11-06 18:40:09,943 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 199 transitions. [2019-11-06 18:40:09,944 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2019-11-06 18:40:09,944 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:40:09,944 INFO L410 BasicCegarLoop]: trace histogram [30, 30, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:40:10,149 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:10,150 INFO L410 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:40:10,150 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:40:10,150 INFO L82 PathProgramCache]: Analyzing trace with hash -1764460921, now seen corresponding path program 30 times [2019-11-06 18:40:10,150 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:40:10,151 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [604316657] [2019-11-06 18:40:10,151 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:40:10,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:10,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:10,738 INFO L134 CoverageAnalysis]: Checked inductivity of 1188 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 288 trivial. 0 not checked. [2019-11-06 18:40:10,738 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [604316657] [2019-11-06 18:40:10,739 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1411936502] [2019-11-06 18:40:10,739 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:14,419 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 31 check-sat command(s) [2019-11-06 18:40:14,419 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:40:14,425 INFO L256 TraceCheckSpWp]: Trace formula consists of 359 conjuncts, 32 conjunts are in the unsatisfiable core [2019-11-06 18:40:14,428 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:40:14,504 INFO L134 CoverageAnalysis]: Checked inductivity of 1188 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 288 trivial. 0 not checked. [2019-11-06 18:40:14,504 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:40:14,504 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 33] total 35 [2019-11-06 18:40:14,504 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [836240165] [2019-11-06 18:40:14,505 INFO L442 AbstractCegarLoop]: Interpolant automaton has 35 states [2019-11-06 18:40:14,505 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:40:14,505 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2019-11-06 18:40:14,506 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=563, Invalid=627, Unknown=0, NotChecked=0, Total=1190 [2019-11-06 18:40:14,506 INFO L87 Difference]: Start difference. First operand 167 states and 199 transitions. Second operand 35 states. [2019-11-06 18:40:14,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:40:14,790 INFO L93 Difference]: Finished difference Result 270 states and 334 transitions. [2019-11-06 18:40:14,790 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2019-11-06 18:40:14,790 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 120 [2019-11-06 18:40:14,791 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:40:14,792 INFO L225 Difference]: With dead ends: 270 [2019-11-06 18:40:14,792 INFO L226 Difference]: Without dead ends: 170 [2019-11-06 18:40:14,793 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 121 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=563, Invalid=627, Unknown=0, NotChecked=0, Total=1190 [2019-11-06 18:40:14,794 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 170 states. [2019-11-06 18:40:14,800 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 170 to 169. [2019-11-06 18:40:14,800 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 169 states. [2019-11-06 18:40:14,801 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 201 transitions. [2019-11-06 18:40:14,801 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 201 transitions. Word has length 120 [2019-11-06 18:40:14,801 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:40:14,802 INFO L462 AbstractCegarLoop]: Abstraction has 169 states and 201 transitions. [2019-11-06 18:40:14,802 INFO L463 AbstractCegarLoop]: Interpolant automaton has 35 states. [2019-11-06 18:40:14,802 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 201 transitions. [2019-11-06 18:40:14,803 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2019-11-06 18:40:14,803 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:40:14,803 INFO L410 BasicCegarLoop]: trace histogram [31, 31, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:40:15,012 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:15,013 INFO L410 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:40:15,013 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:40:15,014 INFO L82 PathProgramCache]: Analyzing trace with hash 1896499625, now seen corresponding path program 31 times [2019-11-06 18:40:15,014 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:40:15,014 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [387758501] [2019-11-06 18:40:15,014 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:40:15,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:15,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:15,826 INFO L134 CoverageAnalysis]: Checked inductivity of 1249 backedges. 0 proven. 961 refuted. 0 times theorem prover too weak. 288 trivial. 0 not checked. [2019-11-06 18:40:15,826 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [387758501] [2019-11-06 18:40:15,826 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2113646959] [2019-11-06 18:40:15,826 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:15,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:15,928 INFO L256 TraceCheckSpWp]: Trace formula consists of 365 conjuncts, 33 conjunts are in the unsatisfiable core [2019-11-06 18:40:15,929 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:40:15,950 INFO L134 CoverageAnalysis]: Checked inductivity of 1249 backedges. 0 proven. 961 refuted. 0 times theorem prover too weak. 288 trivial. 0 not checked. [2019-11-06 18:40:15,950 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:40:15,950 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 34] total 36 [2019-11-06 18:40:15,951 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [660423594] [2019-11-06 18:40:15,951 INFO L442 AbstractCegarLoop]: Interpolant automaton has 36 states [2019-11-06 18:40:15,951 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:40:15,951 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2019-11-06 18:40:15,952 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=597, Invalid=663, Unknown=0, NotChecked=0, Total=1260 [2019-11-06 18:40:15,952 INFO L87 Difference]: Start difference. First operand 169 states and 201 transitions. Second operand 36 states. [2019-11-06 18:40:16,235 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:40:16,235 INFO L93 Difference]: Finished difference Result 272 states and 336 transitions. [2019-11-06 18:40:16,236 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2019-11-06 18:40:16,236 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 122 [2019-11-06 18:40:16,236 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:40:16,237 INFO L225 Difference]: With dead ends: 272 [2019-11-06 18:40:16,237 INFO L226 Difference]: Without dead ends: 172 [2019-11-06 18:40:16,238 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 157 GetRequests, 123 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=597, Invalid=663, Unknown=0, NotChecked=0, Total=1260 [2019-11-06 18:40:16,238 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2019-11-06 18:40:16,245 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 171. [2019-11-06 18:40:16,245 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 171 states. [2019-11-06 18:40:16,246 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 171 states to 171 states and 203 transitions. [2019-11-06 18:40:16,246 INFO L78 Accepts]: Start accepts. Automaton has 171 states and 203 transitions. Word has length 122 [2019-11-06 18:40:16,247 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:40:16,247 INFO L462 AbstractCegarLoop]: Abstraction has 171 states and 203 transitions. [2019-11-06 18:40:16,247 INFO L463 AbstractCegarLoop]: Interpolant automaton has 36 states. [2019-11-06 18:40:16,247 INFO L276 IsEmpty]: Start isEmpty. Operand 171 states and 203 transitions. [2019-11-06 18:40:16,248 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2019-11-06 18:40:16,248 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:40:16,248 INFO L410 BasicCegarLoop]: trace histogram [32, 32, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:40:16,452 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:16,452 INFO L410 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:40:16,453 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:40:16,453 INFO L82 PathProgramCache]: Analyzing trace with hash -1793598389, now seen corresponding path program 32 times [2019-11-06 18:40:16,457 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:40:16,457 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1530446771] [2019-11-06 18:40:16,457 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:40:16,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:16,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:16,942 INFO L134 CoverageAnalysis]: Checked inductivity of 1312 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 288 trivial. 0 not checked. [2019-11-06 18:40:16,942 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1530446771] [2019-11-06 18:40:16,943 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2057873099] [2019-11-06 18:40:16,943 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:17,055 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 18:40:17,056 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:40:17,057 INFO L256 TraceCheckSpWp]: Trace formula consists of 371 conjuncts, 34 conjunts are in the unsatisfiable core [2019-11-06 18:40:17,059 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:40:17,089 INFO L134 CoverageAnalysis]: Checked inductivity of 1312 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 288 trivial. 0 not checked. [2019-11-06 18:40:17,089 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:40:17,090 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 35] total 37 [2019-11-06 18:40:17,090 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1415707720] [2019-11-06 18:40:17,090 INFO L442 AbstractCegarLoop]: Interpolant automaton has 37 states [2019-11-06 18:40:17,090 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:40:17,091 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2019-11-06 18:40:17,091 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=632, Invalid=700, Unknown=0, NotChecked=0, Total=1332 [2019-11-06 18:40:17,091 INFO L87 Difference]: Start difference. First operand 171 states and 203 transitions. Second operand 37 states. [2019-11-06 18:40:17,378 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:40:17,378 INFO L93 Difference]: Finished difference Result 274 states and 338 transitions. [2019-11-06 18:40:17,379 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2019-11-06 18:40:17,379 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 124 [2019-11-06 18:40:17,379 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:40:17,380 INFO L225 Difference]: With dead ends: 274 [2019-11-06 18:40:17,380 INFO L226 Difference]: Without dead ends: 174 [2019-11-06 18:40:17,383 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 125 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 94 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=632, Invalid=700, Unknown=0, NotChecked=0, Total=1332 [2019-11-06 18:40:17,383 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 174 states. [2019-11-06 18:40:17,386 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 174 to 173. [2019-11-06 18:40:17,386 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 173 states. [2019-11-06 18:40:17,387 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 173 states and 205 transitions. [2019-11-06 18:40:17,387 INFO L78 Accepts]: Start accepts. Automaton has 173 states and 205 transitions. Word has length 124 [2019-11-06 18:40:17,387 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:40:17,387 INFO L462 AbstractCegarLoop]: Abstraction has 173 states and 205 transitions. [2019-11-06 18:40:17,388 INFO L463 AbstractCegarLoop]: Interpolant automaton has 37 states. [2019-11-06 18:40:17,388 INFO L276 IsEmpty]: Start isEmpty. Operand 173 states and 205 transitions. [2019-11-06 18:40:17,388 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2019-11-06 18:40:17,389 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:40:17,389 INFO L410 BasicCegarLoop]: trace histogram [33, 33, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:40:17,592 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:17,592 INFO L410 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:40:17,593 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:40:17,593 INFO L82 PathProgramCache]: Analyzing trace with hash -334803347, now seen corresponding path program 33 times [2019-11-06 18:40:17,593 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:40:17,593 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1168983118] [2019-11-06 18:40:17,594 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:40:17,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:18,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:18,099 INFO L134 CoverageAnalysis]: Checked inductivity of 1377 backedges. 0 proven. 1089 refuted. 0 times theorem prover too weak. 288 trivial. 0 not checked. [2019-11-06 18:40:18,099 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1168983118] [2019-11-06 18:40:18,099 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [677466767] [2019-11-06 18:40:18,099 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:18,408 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2019-11-06 18:40:18,409 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:40:18,411 INFO L256 TraceCheckSpWp]: Trace formula consists of 269 conjuncts, 16 conjunts are in the unsatisfiable core [2019-11-06 18:40:18,412 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:40:18,751 INFO L134 CoverageAnalysis]: Checked inductivity of 1377 backedges. 1 proven. 287 refuted. 0 times theorem prover too weak. 1089 trivial. 0 not checked. [2019-11-06 18:40:18,751 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:40:18,751 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 17] total 52 [2019-11-06 18:40:18,752 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1656322301] [2019-11-06 18:40:18,752 INFO L442 AbstractCegarLoop]: Interpolant automaton has 52 states [2019-11-06 18:40:18,752 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:40:18,753 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2019-11-06 18:40:18,753 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=767, Invalid=1885, Unknown=0, NotChecked=0, Total=2652 [2019-11-06 18:40:18,754 INFO L87 Difference]: Start difference. First operand 173 states and 205 transitions. Second operand 52 states. [2019-11-06 18:40:19,243 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:40:19,243 INFO L93 Difference]: Finished difference Result 286 states and 356 transitions. [2019-11-06 18:40:19,243 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2019-11-06 18:40:19,243 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 126 [2019-11-06 18:40:19,244 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:40:19,245 INFO L225 Difference]: With dead ends: 286 [2019-11-06 18:40:19,245 INFO L226 Difference]: Without dead ends: 186 [2019-11-06 18:40:19,246 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 113 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 528 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=767, Invalid=1885, Unknown=0, NotChecked=0, Total=2652 [2019-11-06 18:40:19,246 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 186 states. [2019-11-06 18:40:19,250 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 186 to 181. [2019-11-06 18:40:19,250 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 181 states. [2019-11-06 18:40:19,251 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 181 states to 181 states and 215 transitions. [2019-11-06 18:40:19,251 INFO L78 Accepts]: Start accepts. Automaton has 181 states and 215 transitions. Word has length 126 [2019-11-06 18:40:19,252 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:40:19,252 INFO L462 AbstractCegarLoop]: Abstraction has 181 states and 215 transitions. [2019-11-06 18:40:19,252 INFO L463 AbstractCegarLoop]: Interpolant automaton has 52 states. [2019-11-06 18:40:19,252 INFO L276 IsEmpty]: Start isEmpty. Operand 181 states and 215 transitions. [2019-11-06 18:40:19,253 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2019-11-06 18:40:19,253 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:40:19,253 INFO L410 BasicCegarLoop]: trace histogram [34, 34, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:40:19,457 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:19,458 INFO L410 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:40:19,458 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:40:19,458 INFO L82 PathProgramCache]: Analyzing trace with hash 912852824, now seen corresponding path program 34 times [2019-11-06 18:40:19,459 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:40:19,459 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1984641752] [2019-11-06 18:40:19,459 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:40:19,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:20,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:20,185 INFO L134 CoverageAnalysis]: Checked inductivity of 1487 backedges. 0 proven. 1156 refuted. 0 times theorem prover too weak. 331 trivial. 0 not checked. [2019-11-06 18:40:20,185 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1984641752] [2019-11-06 18:40:20,185 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [162564906] [2019-11-06 18:40:20,185 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:20,297 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-06 18:40:20,297 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:40:20,298 INFO L256 TraceCheckSpWp]: Trace formula consists of 391 conjuncts, 36 conjunts are in the unsatisfiable core [2019-11-06 18:40:20,312 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:40:20,361 INFO L134 CoverageAnalysis]: Checked inductivity of 1487 backedges. 0 proven. 1156 refuted. 0 times theorem prover too weak. 331 trivial. 0 not checked. [2019-11-06 18:40:20,362 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:40:20,362 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 37] total 39 [2019-11-06 18:40:20,362 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [931360153] [2019-11-06 18:40:20,362 INFO L442 AbstractCegarLoop]: Interpolant automaton has 39 states [2019-11-06 18:40:20,362 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:40:20,363 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2019-11-06 18:40:20,363 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=705, Invalid=777, Unknown=0, NotChecked=0, Total=1482 [2019-11-06 18:40:20,363 INFO L87 Difference]: Start difference. First operand 181 states and 215 transitions. Second operand 39 states. [2019-11-06 18:40:20,604 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:40:20,604 INFO L93 Difference]: Finished difference Result 290 states and 358 transitions. [2019-11-06 18:40:20,604 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2019-11-06 18:40:20,605 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 131 [2019-11-06 18:40:20,605 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:40:20,606 INFO L225 Difference]: With dead ends: 290 [2019-11-06 18:40:20,606 INFO L226 Difference]: Without dead ends: 184 [2019-11-06 18:40:20,607 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 169 GetRequests, 132 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 100 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=705, Invalid=777, Unknown=0, NotChecked=0, Total=1482 [2019-11-06 18:40:20,607 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2019-11-06 18:40:20,611 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 183. [2019-11-06 18:40:20,611 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 183 states. [2019-11-06 18:40:20,612 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 183 states to 183 states and 217 transitions. [2019-11-06 18:40:20,612 INFO L78 Accepts]: Start accepts. Automaton has 183 states and 217 transitions. Word has length 131 [2019-11-06 18:40:20,612 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:40:20,612 INFO L462 AbstractCegarLoop]: Abstraction has 183 states and 217 transitions. [2019-11-06 18:40:20,612 INFO L463 AbstractCegarLoop]: Interpolant automaton has 39 states. [2019-11-06 18:40:20,613 INFO L276 IsEmpty]: Start isEmpty. Operand 183 states and 217 transitions. [2019-11-06 18:40:20,613 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2019-11-06 18:40:20,613 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:40:20,614 INFO L410 BasicCegarLoop]: trace histogram [35, 35, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:40:20,814 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:20,814 INFO L410 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:40:20,815 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:40:20,815 INFO L82 PathProgramCache]: Analyzing trace with hash -906409226, now seen corresponding path program 35 times [2019-11-06 18:40:20,815 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:40:20,815 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [638890868] [2019-11-06 18:40:20,816 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:40:20,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:21,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:21,585 INFO L134 CoverageAnalysis]: Checked inductivity of 1556 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 331 trivial. 0 not checked. [2019-11-06 18:40:21,586 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [638890868] [2019-11-06 18:40:21,586 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1627989812] [2019-11-06 18:40:21,586 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true