/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/recursive/Ackermann01-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-72570d3 [2020-08-22 16:18:22,948 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-22 16:18:22,951 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-22 16:18:22,990 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-22 16:18:22,991 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-22 16:18:22,998 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-22 16:18:23,001 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-22 16:18:23,005 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-22 16:18:23,007 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-22 16:18:23,010 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-22 16:18:23,010 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-22 16:18:23,011 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-22 16:18:23,012 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-22 16:18:23,014 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-22 16:18:23,017 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-22 16:18:23,018 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-22 16:18:23,019 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-22 16:18:23,020 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-22 16:18:23,022 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-22 16:18:23,031 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-22 16:18:23,033 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-22 16:18:23,034 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-22 16:18:23,035 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-22 16:18:23,035 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-22 16:18:23,048 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-22 16:18:23,063 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-22 16:18:23,066 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-22 16:18:23,067 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-22 16:18:23,068 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-22 16:18:23,104 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-22 16:18:23,104 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-22 16:18:23,105 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-22 16:18:23,105 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-22 16:18:23,106 INFO L138 SettingsManager]: * Use SBE=true [2020-08-22 16:18:23,106 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-22 16:18:23,106 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-22 16:18:23,106 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-22 16:18:23,106 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-22 16:18:23,107 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-22 16:18:23,107 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-22 16:18:23,107 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-22 16:18:23,107 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-22 16:18:23,107 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-22 16:18:23,107 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-22 16:18:23,108 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-22 16:18:23,108 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-22 16:18:23,108 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-22 16:18:23,108 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-22 16:18:23,109 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-22 16:18:23,109 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-22 16:18:23,109 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-22 16:18:23,109 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-22 16:18:23,109 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-22 16:18:23,110 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-22 16:18:23,110 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-22 16:18:23,110 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-22 16:18:23,110 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-22 16:18:23,110 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-22 16:18:23,110 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2020-08-22 16:18:23,392 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-22 16:18:23,407 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-22 16:18:23,412 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-22 16:18:23,413 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-22 16:18:23,414 INFO L275 PluginConnector]: CDTParser initialized [2020-08-22 16:18:23,414 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive/Ackermann01-2.c [2020-08-22 16:18:23,475 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/42af8b08c/621e1f4170bb4561935a824a62513ab0/FLAG0e2d8828c [2020-08-22 16:18:23,891 INFO L306 CDTParser]: Found 1 translation units. [2020-08-22 16:18:23,892 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive/Ackermann01-2.c [2020-08-22 16:18:23,898 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/42af8b08c/621e1f4170bb4561935a824a62513ab0/FLAG0e2d8828c [2020-08-22 16:18:24,317 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/42af8b08c/621e1f4170bb4561935a824a62513ab0 [2020-08-22 16:18:24,327 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-22 16:18:24,329 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-22 16:18:24,332 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-22 16:18:24,332 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-22 16:18:24,336 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-22 16:18:24,337 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 04:18:24" (1/1) ... [2020-08-22 16:18:24,340 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1e46c6eb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:18:24, skipping insertion in model container [2020-08-22 16:18:24,340 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 04:18:24" (1/1) ... [2020-08-22 16:18:24,347 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-22 16:18:24,365 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-22 16:18:24,532 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 16:18:24,537 INFO L203 MainTranslator]: Completed pre-run [2020-08-22 16:18:24,554 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 16:18:24,568 INFO L208 MainTranslator]: Completed translation [2020-08-22 16:18:24,568 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:18:24 WrapperNode [2020-08-22 16:18:24,568 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-22 16:18:24,569 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-22 16:18:24,569 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-22 16:18:24,569 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-22 16:18:24,579 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:18:24" (1/1) ... [2020-08-22 16:18:24,579 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:18:24" (1/1) ... [2020-08-22 16:18:24,660 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:18:24" (1/1) ... [2020-08-22 16:18:24,661 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:18:24" (1/1) ... [2020-08-22 16:18:24,665 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:18:24" (1/1) ... [2020-08-22 16:18:24,667 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:18:24" (1/1) ... [2020-08-22 16:18:24,672 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:18:24" (1/1) ... [2020-08-22 16:18:24,674 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-22 16:18:24,675 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-22 16:18:24,675 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-22 16:18:24,675 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-22 16:18:24,683 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:18:24" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-22 16:18:24,745 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-22 16:18:24,746 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-22 16:18:24,746 INFO L138 BoogieDeclarations]: Found implementation of procedure ackermann [2020-08-22 16:18:24,746 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-22 16:18:24,746 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-22 16:18:24,746 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-22 16:18:24,746 INFO L130 BoogieDeclarations]: Found specification of procedure ackermann [2020-08-22 16:18:24,746 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-22 16:18:24,747 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-22 16:18:24,747 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-22 16:18:24,936 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-22 16:18:24,936 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-08-22 16:18:24,941 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 04:18:24 BoogieIcfgContainer [2020-08-22 16:18:24,941 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-22 16:18:24,942 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-22 16:18:24,943 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-22 16:18:24,946 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-22 16:18:24,946 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.08 04:18:24" (1/3) ... [2020-08-22 16:18:24,947 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@36b4d317 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 04:18:24, skipping insertion in model container [2020-08-22 16:18:24,947 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:18:24" (2/3) ... [2020-08-22 16:18:24,947 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@36b4d317 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 04:18:24, skipping insertion in model container [2020-08-22 16:18:24,948 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 04:18:24" (3/3) ... [2020-08-22 16:18:24,949 INFO L109 eAbstractionObserver]: Analyzing ICFG Ackermann01-2.c [2020-08-22 16:18:24,963 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-08-22 16:18:24,974 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-22 16:18:24,993 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-22 16:18:25,021 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-22 16:18:25,021 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-22 16:18:25,021 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-08-22 16:18:25,022 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-22 16:18:25,022 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-22 16:18:25,022 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-22 16:18:25,022 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-22 16:18:25,022 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-22 16:18:25,043 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states. [2020-08-22 16:18:25,050 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-22 16:18:25,051 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 16:18:25,052 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 16:18:25,052 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 16:18:25,058 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 16:18:25,058 INFO L82 PathProgramCache]: Analyzing trace with hash -1796234678, now seen corresponding path program 1 times [2020-08-22 16:18:25,069 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-08-22 16:18:25,069 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1773916722] [2020-08-22 16:18:25,070 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 16:18:25,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:18:25,296 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 16:18:25,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:18:25,302 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-08-22 16:18:25,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:18:25,352 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 16:18:25,354 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1773916722] [2020-08-22 16:18:25,355 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 16:18:25,355 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2020-08-22 16:18:25,356 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [103923718] [2020-08-22 16:18:25,361 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-22 16:18:25,362 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-08-22 16:18:25,372 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-22 16:18:25,373 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-08-22 16:18:25,374 INFO L87 Difference]: Start difference. First operand 27 states. Second operand 7 states. [2020-08-22 16:18:25,581 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 16:18:25,581 INFO L93 Difference]: Finished difference Result 41 states and 51 transitions. [2020-08-22 16:18:25,582 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-22 16:18:25,583 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 15 [2020-08-22 16:18:25,584 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 16:18:25,595 INFO L225 Difference]: With dead ends: 41 [2020-08-22 16:18:25,595 INFO L226 Difference]: Without dead ends: 25 [2020-08-22 16:18:25,599 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2020-08-22 16:18:25,618 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-22 16:18:25,644 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-08-22 16:18:25,646 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-22 16:18:25,648 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 31 transitions. [2020-08-22 16:18:25,649 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 31 transitions. Word has length 15 [2020-08-22 16:18:25,650 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 16:18:25,650 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 31 transitions. [2020-08-22 16:18:25,650 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-22 16:18:25,651 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 31 transitions. [2020-08-22 16:18:25,653 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-22 16:18:25,653 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 16:18:25,654 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 16:18:25,654 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-22 16:18:25,654 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 16:18:25,655 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 16:18:25,655 INFO L82 PathProgramCache]: Analyzing trace with hash -895156504, now seen corresponding path program 1 times [2020-08-22 16:18:25,655 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-08-22 16:18:25,656 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1099500427] [2020-08-22 16:18:25,656 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 16:18:25,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:18:25,731 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 16:18:25,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:18:25,734 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-08-22 16:18:25,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:18:25,773 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-22 16:18:25,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:18:25,836 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-22 16:18:25,837 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1099500427] [2020-08-22 16:18:25,837 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 16:18:25,837 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-08-22 16:18:25,838 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [971920794] [2020-08-22 16:18:25,839 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-22 16:18:25,840 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-08-22 16:18:25,840 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-22 16:18:25,840 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-08-22 16:18:25,841 INFO L87 Difference]: Start difference. First operand 25 states and 31 transitions. Second operand 8 states. [2020-08-22 16:18:26,016 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 16:18:26,016 INFO L93 Difference]: Finished difference Result 32 states and 40 transitions. [2020-08-22 16:18:26,017 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-22 16:18:26,017 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 22 [2020-08-22 16:18:26,018 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 16:18:26,019 INFO L225 Difference]: With dead ends: 32 [2020-08-22 16:18:26,019 INFO L226 Difference]: Without dead ends: 28 [2020-08-22 16:18:26,021 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=80, Unknown=0, NotChecked=0, Total=110 [2020-08-22 16:18:26,021 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-22 16:18:26,028 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2020-08-22 16:18:26,029 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-22 16:18:26,030 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 32 transitions. [2020-08-22 16:18:26,030 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 32 transitions. Word has length 22 [2020-08-22 16:18:26,031 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 16:18:26,031 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 32 transitions. [2020-08-22 16:18:26,031 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-22 16:18:26,031 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 32 transitions. [2020-08-22 16:18:26,033 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-22 16:18:26,033 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 16:18:26,034 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 16:18:26,034 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-22 16:18:26,034 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 16:18:26,034 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 16:18:26,035 INFO L82 PathProgramCache]: Analyzing trace with hash 408363011, now seen corresponding path program 1 times [2020-08-22 16:18:26,035 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-08-22 16:18:26,035 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2033078163] [2020-08-22 16:18:26,036 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 16:18:26,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:18:26,095 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 16:18:26,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:18:26,097 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-08-22 16:18:26,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:18:26,144 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-22 16:18:26,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:18:26,171 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2020-08-22 16:18:26,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:18:26,178 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 5 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-08-22 16:18:26,179 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2033078163] [2020-08-22 16:18:26,179 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2051651035] [2020-08-22 16:18:26,179 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-08-22 16:18:26,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:18:26,225 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 6 conjunts are in the unsatisfiable core [2020-08-22 16:18:26,231 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-08-22 16:18:26,351 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-08-22 16:18:26,352 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-08-22 16:18:26,352 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 7] total 10 [2020-08-22 16:18:26,353 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1445865313] [2020-08-22 16:18:26,353 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-22 16:18:26,354 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-08-22 16:18:26,354 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-22 16:18:26,354 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2020-08-22 16:18:26,355 INFO L87 Difference]: Start difference. First operand 26 states and 32 transitions. Second operand 10 states. [2020-08-22 16:18:26,518 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 16:18:26,518 INFO L93 Difference]: Finished difference Result 51 states and 78 transitions. [2020-08-22 16:18:26,519 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-22 16:18:26,519 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 28 [2020-08-22 16:18:26,519 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 16:18:26,521 INFO L225 Difference]: With dead ends: 51 [2020-08-22 16:18:26,522 INFO L226 Difference]: Without dead ends: 33 [2020-08-22 16:18:26,523 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=52, Invalid=130, Unknown=0, NotChecked=0, Total=182 [2020-08-22 16:18:26,523 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-22 16:18:26,531 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 28. [2020-08-22 16:18:26,532 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-22 16:18:26,533 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 35 transitions. [2020-08-22 16:18:26,533 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 35 transitions. Word has length 28 [2020-08-22 16:18:26,534 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 16:18:26,534 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 35 transitions. [2020-08-22 16:18:26,534 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-22 16:18:26,534 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 35 transitions. [2020-08-22 16:18:26,536 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-08-22 16:18:26,537 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 16:18:26,537 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 16:18:26,750 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2020-08-22 16:18:26,750 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 16:18:26,751 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 16:18:26,751 INFO L82 PathProgramCache]: Analyzing trace with hash 718507263, now seen corresponding path program 1 times [2020-08-22 16:18:26,752 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-08-22 16:18:26,752 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [83160010] [2020-08-22 16:18:26,753 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 16:18:26,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:18:26,800 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 16:18:26,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:18:26,803 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-08-22 16:18:26,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:18:26,851 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-22 16:18:26,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:18:26,881 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-22 16:18:26,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:18:26,928 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2020-08-22 16:18:26,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:18:26,963 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 13 proven. 4 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2020-08-22 16:18:26,964 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [83160010] [2020-08-22 16:18:26,964 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1507043059] [2020-08-22 16:18:26,964 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-08-22 16:18:26,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:18:26,999 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 14 conjunts are in the unsatisfiable core [2020-08-22 16:18:27,002 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-08-22 16:18:27,064 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 6 proven. 8 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-08-22 16:18:27,065 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-08-22 16:18:27,065 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 11] total 14 [2020-08-22 16:18:27,065 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1233807674] [2020-08-22 16:18:27,066 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-22 16:18:27,066 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-08-22 16:18:27,067 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-22 16:18:27,067 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=151, Unknown=0, NotChecked=0, Total=182 [2020-08-22 16:18:27,067 INFO L87 Difference]: Start difference. First operand 28 states and 35 transitions. Second operand 14 states. [2020-08-22 16:18:27,530 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 16:18:27,531 INFO L93 Difference]: Finished difference Result 54 states and 87 transitions. [2020-08-22 16:18:27,531 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-22 16:18:27,531 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 35 [2020-08-22 16:18:27,531 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 16:18:27,535 INFO L225 Difference]: With dead ends: 54 [2020-08-22 16:18:27,535 INFO L226 Difference]: Without dead ends: 50 [2020-08-22 16:18:27,536 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=124, Invalid=476, Unknown=0, NotChecked=0, Total=600 [2020-08-22 16:18:27,537 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-08-22 16:18:27,549 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 36. [2020-08-22 16:18:27,550 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-22 16:18:27,551 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 53 transitions. [2020-08-22 16:18:27,552 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 53 transitions. Word has length 35 [2020-08-22 16:18:27,552 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 16:18:27,552 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 53 transitions. [2020-08-22 16:18:27,552 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-22 16:18:27,553 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 53 transitions. [2020-08-22 16:18:27,554 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-22 16:18:27,554 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 16:18:27,555 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 16:18:27,768 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-08-22 16:18:27,768 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 16:18:27,768 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 16:18:27,769 INFO L82 PathProgramCache]: Analyzing trace with hash -1711672813, now seen corresponding path program 2 times [2020-08-22 16:18:27,769 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-08-22 16:18:27,770 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [833629460] [2020-08-22 16:18:27,770 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 16:18:27,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:18:27,810 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 16:18:27,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:18:27,812 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-08-22 16:18:27,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:18:27,851 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-22 16:18:27,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:18:27,882 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-22 16:18:27,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:18:27,910 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-22 16:18:27,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:18:27,950 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2020-08-22 16:18:27,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:18:27,985 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 20 proven. 6 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2020-08-22 16:18:27,986 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [833629460] [2020-08-22 16:18:27,986 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1664267932] [2020-08-22 16:18:27,986 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-08-22 16:18:28,021 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-08-22 16:18:28,021 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-08-22 16:18:28,022 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 16 conjunts are in the unsatisfiable core [2020-08-22 16:18:28,025 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-08-22 16:18:28,085 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 11 proven. 12 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2020-08-22 16:18:28,085 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-08-22 16:18:28,085 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12] total 15 [2020-08-22 16:18:28,086 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [143607302] [2020-08-22 16:18:28,086 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-22 16:18:28,086 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-08-22 16:18:28,087 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-22 16:18:28,087 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=176, Unknown=0, NotChecked=0, Total=210 [2020-08-22 16:18:28,087 INFO L87 Difference]: Start difference. First operand 36 states and 53 transitions. Second operand 15 states. [2020-08-22 16:18:28,596 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 16:18:28,597 INFO L93 Difference]: Finished difference Result 65 states and 116 transitions. [2020-08-22 16:18:28,597 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-22 16:18:28,597 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 42 [2020-08-22 16:18:28,598 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 16:18:28,600 INFO L225 Difference]: With dead ends: 65 [2020-08-22 16:18:28,600 INFO L226 Difference]: Without dead ends: 61 [2020-08-22 16:18:28,601 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=137, Invalid=565, Unknown=0, NotChecked=0, Total=702 [2020-08-22 16:18:28,602 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-08-22 16:18:28,614 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 34. [2020-08-22 16:18:28,614 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-22 16:18:28,615 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 47 transitions. [2020-08-22 16:18:28,616 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 47 transitions. Word has length 42 [2020-08-22 16:18:28,616 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 16:18:28,616 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 47 transitions. [2020-08-22 16:18:28,617 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-22 16:18:28,617 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 47 transitions. [2020-08-22 16:18:28,618 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-22 16:18:28,618 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 16:18:28,619 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 16:18:28,832 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-08-22 16:18:28,833 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 16:18:28,833 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 16:18:28,834 INFO L82 PathProgramCache]: Analyzing trace with hash -1051926487, now seen corresponding path program 3 times [2020-08-22 16:18:28,834 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-08-22 16:18:28,835 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [516339514] [2020-08-22 16:18:28,836 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 16:18:28,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:18:28,874 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 16:18:28,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:18:28,879 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-08-22 16:18:28,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:18:28,913 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-22 16:18:28,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:18:28,937 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-22 16:18:28,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:18:28,949 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2020-08-22 16:18:28,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:18:28,966 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-22 16:18:28,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:18:28,974 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 16 proven. 9 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2020-08-22 16:18:28,974 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [516339514] [2020-08-22 16:18:28,975 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [115501432] [2020-08-22 16:18:28,975 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-08-22 16:18:29,003 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2020-08-22 16:18:29,003 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-08-22 16:18:29,004 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 10 conjunts are in the unsatisfiable core [2020-08-22 16:18:29,007 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-08-22 16:18:29,121 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 17 proven. 4 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2020-08-22 16:18:29,122 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-08-22 16:18:29,122 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 14 [2020-08-22 16:18:29,122 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [697746064] [2020-08-22 16:18:29,123 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-22 16:18:29,123 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-08-22 16:18:29,123 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-22 16:18:29,123 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=156, Unknown=0, NotChecked=0, Total=182 [2020-08-22 16:18:29,124 INFO L87 Difference]: Start difference. First operand 34 states and 47 transitions. Second operand 14 states. [2020-08-22 16:18:29,542 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 16:18:29,542 INFO L93 Difference]: Finished difference Result 81 states and 138 transitions. [2020-08-22 16:18:29,544 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-22 16:18:29,544 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 42 [2020-08-22 16:18:29,544 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 16:18:29,546 INFO L225 Difference]: With dead ends: 81 [2020-08-22 16:18:29,546 INFO L226 Difference]: Without dead ends: 53 [2020-08-22 16:18:29,548 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=111, Invalid=441, Unknown=0, NotChecked=0, Total=552 [2020-08-22 16:18:29,548 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-08-22 16:18:29,558 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2020-08-22 16:18:29,559 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-22 16:18:29,560 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 81 transitions. [2020-08-22 16:18:29,561 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 81 transitions. Word has length 42 [2020-08-22 16:18:29,561 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 16:18:29,561 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 81 transitions. [2020-08-22 16:18:29,561 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-22 16:18:29,561 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 81 transitions. [2020-08-22 16:18:29,564 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2020-08-22 16:18:29,564 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 16:18:29,565 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 5, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 16:18:29,778 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-08-22 16:18:29,779 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 16:18:29,779 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 16:18:29,780 INFO L82 PathProgramCache]: Analyzing trace with hash -2003160496, now seen corresponding path program 4 times [2020-08-22 16:18:29,780 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-08-22 16:18:29,781 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [98671004] [2020-08-22 16:18:29,781 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 16:18:29,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:18:29,799 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 16:18:29,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:18:29,801 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-08-22 16:18:29,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:18:29,813 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-22 16:18:29,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:18:29,824 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-22 16:18:29,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:18:29,830 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-22 16:18:29,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:18:29,844 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-22 16:18:29,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:18:29,849 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-08-22 16:18:29,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:18:29,853 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-22 16:18:29,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:18:29,857 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 43 [2020-08-22 16:18:29,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:18:29,864 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 32 proven. 22 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2020-08-22 16:18:29,864 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [98671004] [2020-08-22 16:18:29,864 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [270720812] [2020-08-22 16:18:29,865 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-08-22 16:18:29,916 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-08-22 16:18:29,917 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-08-22 16:18:29,918 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 3 conjunts are in the unsatisfiable core [2020-08-22 16:18:29,928 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-08-22 16:18:29,969 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 71 proven. 1 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2020-08-22 16:18:29,969 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-08-22 16:18:29,969 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 6 [2020-08-22 16:18:29,970 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [322774046] [2020-08-22 16:18:29,970 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-22 16:18:29,971 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-08-22 16:18:29,971 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-22 16:18:29,971 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-22 16:18:29,971 INFO L87 Difference]: Start difference. First operand 53 states and 81 transitions. Second operand 6 states. [2020-08-22 16:18:30,030 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 16:18:30,030 INFO L93 Difference]: Finished difference Result 101 states and 188 transitions. [2020-08-22 16:18:30,032 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-22 16:18:30,032 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 62 [2020-08-22 16:18:30,033 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 16:18:30,036 INFO L225 Difference]: With dead ends: 101 [2020-08-22 16:18:30,036 INFO L226 Difference]: Without dead ends: 56 [2020-08-22 16:18:30,041 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 81 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-08-22 16:18:30,041 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-08-22 16:18:30,055 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2020-08-22 16:18:30,055 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-08-22 16:18:30,056 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 87 transitions. [2020-08-22 16:18:30,056 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 87 transitions. Word has length 62 [2020-08-22 16:18:30,057 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 16:18:30,057 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 87 transitions. [2020-08-22 16:18:30,057 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-22 16:18:30,057 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 87 transitions. [2020-08-22 16:18:30,060 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2020-08-22 16:18:30,061 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 16:18:30,061 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 6, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 16:18:30,275 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2020-08-22 16:18:30,276 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 16:18:30,276 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 16:18:30,277 INFO L82 PathProgramCache]: Analyzing trace with hash 1483482771, now seen corresponding path program 5 times [2020-08-22 16:18:30,277 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-08-22 16:18:30,278 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1234955377] [2020-08-22 16:18:30,278 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 16:18:30,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:18:30,312 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 16:18:30,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:18:30,313 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-08-22 16:18:30,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:18:30,345 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-22 16:18:30,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:18:30,369 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-22 16:18:30,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:18:30,393 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-22 16:18:30,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:18:30,418 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-22 16:18:30,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:18:30,443 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-22 16:18:30,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:18:30,491 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2020-08-22 16:18:30,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:18:30,531 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 36 [2020-08-22 16:18:30,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:18:30,555 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-22 16:18:30,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:18:30,563 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 56 [2020-08-22 16:18:30,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:18:30,641 INFO L134 CoverageAnalysis]: Checked inductivity of 213 backedges. 83 proven. 50 refuted. 0 times theorem prover too weak. 80 trivial. 0 not checked. [2020-08-22 16:18:30,641 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1234955377] [2020-08-22 16:18:30,642 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1550048334] [2020-08-22 16:18:30,642 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-08-22 16:18:30,704 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2020-08-22 16:18:30,705 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-08-22 16:18:30,706 INFO L263 TraceCheckSpWp]: Trace formula consists of 150 conjuncts, 17 conjunts are in the unsatisfiable core [2020-08-22 16:18:30,720 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-08-22 16:18:30,827 INFO L134 CoverageAnalysis]: Checked inductivity of 213 backedges. 97 proven. 37 refuted. 0 times theorem prover too weak. 79 trivial. 0 not checked. [2020-08-22 16:18:30,828 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-08-22 16:18:30,828 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 12] total 19 [2020-08-22 16:18:30,828 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [426283363] [2020-08-22 16:18:30,830 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-22 16:18:30,830 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-08-22 16:18:30,830 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-22 16:18:30,830 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=296, Unknown=0, NotChecked=0, Total=342 [2020-08-22 16:18:30,831 INFO L87 Difference]: Start difference. First operand 56 states and 87 transitions. Second operand 19 states. [2020-08-22 16:18:31,437 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 16:18:31,437 INFO L93 Difference]: Finished difference Result 101 states and 206 transitions. [2020-08-22 16:18:31,438 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-22 16:18:31,438 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 75 [2020-08-22 16:18:31,438 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 16:18:31,439 INFO L225 Difference]: With dead ends: 101 [2020-08-22 16:18:31,439 INFO L226 Difference]: Without dead ends: 0 [2020-08-22 16:18:31,441 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 99 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 182 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=292, Invalid=1114, Unknown=0, NotChecked=0, Total=1406 [2020-08-22 16:18:31,441 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-08-22 16:18:31,441 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-08-22 16:18:31,442 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-08-22 16:18:31,442 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-08-22 16:18:31,442 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 75 [2020-08-22 16:18:31,442 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 16:18:31,442 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-08-22 16:18:31,443 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-22 16:18:31,443 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-08-22 16:18:31,443 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-08-22 16:18:31,643 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-08-22 16:18:31,647 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-08-22 16:18:32,112 WARN L193 SmtUtils]: Spent 167.00 ms on a formula simplification. DAG size of input: 41 DAG size of output: 25 [2020-08-22 16:18:32,160 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-08-22 16:18:32,160 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-08-22 16:18:32,160 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-08-22 16:18:32,160 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-08-22 16:18:32,160 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-08-22 16:18:32,160 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-08-22 16:18:32,160 INFO L268 CegarLoopResult]: For program point ackermannEXIT(lines 15 23) no Hoare annotation was computed. [2020-08-22 16:18:32,161 INFO L264 CegarLoopResult]: At program point L22(line 22) the Hoare annotation is: (and (not (= ackermann_~m 0)) (= ackermann_~m |ackermann_#in~m|) (= ackermann_~n |ackermann_#in~n|)) [2020-08-22 16:18:32,161 INFO L271 CegarLoopResult]: At program point ackermannENTRY(lines 15 23) the Hoare annotation is: true [2020-08-22 16:18:32,161 INFO L268 CegarLoopResult]: For program point L22-1(line 22) no Hoare annotation was computed. [2020-08-22 16:18:32,161 INFO L264 CegarLoopResult]: At program point L20(line 20) the Hoare annotation is: (and (= |ackermann_#in~n| 0) (not (= ackermann_~m 0)) (= ackermann_~m |ackermann_#in~m|) (= ackermann_~n |ackermann_#in~n|)) [2020-08-22 16:18:32,161 INFO L264 CegarLoopResult]: At program point L22-2(line 22) the Hoare annotation is: (let ((.cse0 (<= 3 |ackermann_#t~ret1|))) (and (or (= |ackermann_#in~n| 1) .cse0 (and (<= 2 |ackermann_#res|) (<= (+ |ackermann_#in~n| 1) |ackermann_#res|))) (let ((.cse1 (<= 1 |ackermann_#in~m|)) (.cse2 (= ackermann_~m |ackermann_#in~m|)) (.cse3 (= ackermann_~n |ackermann_#in~n|))) (or (and (<= 2 |ackermann_#t~ret1|) (<= ackermann_~m 1) .cse1 .cse2 .cse3) (and .cse0 .cse1 .cse2 .cse3))))) [2020-08-22 16:18:32,162 INFO L268 CegarLoopResult]: For program point L19(lines 19 21) no Hoare annotation was computed. [2020-08-22 16:18:32,162 INFO L268 CegarLoopResult]: For program point L20-1(line 20) no Hoare annotation was computed. [2020-08-22 16:18:32,162 INFO L268 CegarLoopResult]: For program point L22-3(line 22) no Hoare annotation was computed. [2020-08-22 16:18:32,162 INFO L268 CegarLoopResult]: For program point L16(lines 16 18) no Hoare annotation was computed. [2020-08-22 16:18:32,162 INFO L268 CegarLoopResult]: For program point ackermannFINAL(lines 15 23) no Hoare annotation was computed. [2020-08-22 16:18:32,162 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 44) no Hoare annotation was computed. [2020-08-22 16:18:32,163 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 26 46) the Hoare annotation is: true [2020-08-22 16:18:32,163 INFO L268 CegarLoopResult]: For program point L28(lines 28 32) no Hoare annotation was computed. [2020-08-22 16:18:32,163 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 26 46) no Hoare annotation was computed. [2020-08-22 16:18:32,163 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 26 46) no Hoare annotation was computed. [2020-08-22 16:18:32,163 INFO L268 CegarLoopResult]: For program point L44(line 44) no Hoare annotation was computed. [2020-08-22 16:18:32,163 INFO L268 CegarLoopResult]: For program point L41(lines 41 45) no Hoare annotation was computed. [2020-08-22 16:18:32,163 INFO L264 CegarLoopResult]: At program point L40(line 40) the Hoare annotation is: (<= 0 main_~n~0) [2020-08-22 16:18:32,163 INFO L268 CegarLoopResult]: For program point L40-1(line 40) no Hoare annotation was computed. [2020-08-22 16:18:32,164 INFO L268 CegarLoopResult]: For program point L34(lines 34 39) no Hoare annotation was computed. [2020-08-22 16:18:32,169 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 22.08 04:18:32 BoogieIcfgContainer [2020-08-22 16:18:32,169 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-22 16:18:32,171 INFO L168 Benchmark]: Toolchain (without parser) took 7842.42 ms. Allocated memory was 141.0 MB in the beginning and 295.2 MB in the end (delta: 154.1 MB). Free memory was 104.1 MB in the beginning and 204.6 MB in the end (delta: -100.5 MB). Peak memory consumption was 138.1 MB. Max. memory is 7.1 GB. [2020-08-22 16:18:32,172 INFO L168 Benchmark]: CDTParser took 0.22 ms. Allocated memory is still 141.0 MB. Free memory was 122.5 MB in the beginning and 122.1 MB in the end (delta: 419.5 kB). Peak memory consumption was 419.5 kB. Max. memory is 7.1 GB. [2020-08-22 16:18:32,173 INFO L168 Benchmark]: CACSL2BoogieTranslator took 236.75 ms. Allocated memory is still 141.0 MB. Free memory was 103.7 MB in the beginning and 94.1 MB in the end (delta: 9.6 MB). Peak memory consumption was 9.6 MB. Max. memory is 7.1 GB. [2020-08-22 16:18:32,174 INFO L168 Benchmark]: Boogie Preprocessor took 105.22 ms. Allocated memory was 141.0 MB in the beginning and 203.4 MB in the end (delta: 62.4 MB). Free memory was 94.1 MB in the beginning and 181.8 MB in the end (delta: -87.8 MB). Peak memory consumption was 12.7 MB. Max. memory is 7.1 GB. [2020-08-22 16:18:32,174 INFO L168 Benchmark]: RCFGBuilder took 266.33 ms. Allocated memory is still 203.4 MB. Free memory was 181.8 MB in the beginning and 168.6 MB in the end (delta: 13.3 MB). Peak memory consumption was 13.3 MB. Max. memory is 7.1 GB. [2020-08-22 16:18:32,175 INFO L168 Benchmark]: TraceAbstraction took 7226.97 ms. Allocated memory was 203.4 MB in the beginning and 295.2 MB in the end (delta: 91.8 MB). Free memory was 168.6 MB in the beginning and 204.6 MB in the end (delta: -36.1 MB). Peak memory consumption was 140.1 MB. Max. memory is 7.1 GB. [2020-08-22 16:18:32,179 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.22 ms. Allocated memory is still 141.0 MB. Free memory was 122.5 MB in the beginning and 122.1 MB in the end (delta: 419.5 kB). Peak memory consumption was 419.5 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 236.75 ms. Allocated memory is still 141.0 MB. Free memory was 103.7 MB in the beginning and 94.1 MB in the end (delta: 9.6 MB). Peak memory consumption was 9.6 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 105.22 ms. Allocated memory was 141.0 MB in the beginning and 203.4 MB in the end (delta: 62.4 MB). Free memory was 94.1 MB in the beginning and 181.8 MB in the end (delta: -87.8 MB). Peak memory consumption was 12.7 MB. Max. memory is 7.1 GB. * RCFGBuilder took 266.33 ms. Allocated memory is still 203.4 MB. Free memory was 181.8 MB in the beginning and 168.6 MB in the end (delta: 13.3 MB). Peak memory consumption was 13.3 MB. Max. memory is 7.1 GB. * TraceAbstraction took 7226.97 ms. Allocated memory was 203.4 MB in the beginning and 295.2 MB in the end (delta: 91.8 MB). Free memory was 168.6 MB in the beginning and 204.6 MB in the end (delta: -36.1 MB). Peak memory consumption was 140.1 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 44]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 27 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 6.6s, OverallIterations: 8, TraceHistogramMax: 10, AutomataDifference: 2.6s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.5s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 173 SDtfs, 195 SDslu, 849 SDs, 0 SdLazy, 1561 SolverSat, 311 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 517 GetRequests, 377 SyntacticMatches, 0 SemanticMatches, 140 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 371 ImplicationChecksByTransitivity, 1.8s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=56occurred in iteration=7, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 8 MinimizatonAttempts, 48 StatesRemovedByMinimization, 4 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 9 LocationsWithAnnotation, 125 PreInvPairs, 152 NumberOfFragments, 80 HoareAnnotationTreeSize, 125 FomulaSimplifications, 8461 FormulaSimplificationTreeSizeReduction, 0.2s HoareSimplificationTime, 9 FomulaSimplificationsInter, 317 FormulaSimplificationTreeSizeReductionInter, 0.2s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 1.9s InterpolantComputationTime, 605 NumberOfCodeBlocks, 557 NumberOfCodeBlocksAsserted, 22 NumberOfCheckSat, 591 ConstructedInterpolants, 0 QuantifiedInterpolants, 52611 SizeOfPredicates, 19 NumberOfNonLiveVariables, 695 ConjunctsInSsa, 66 ConjunctsInUnsatCore, 14 InterpolantComputations, 2 PerfectInterpolantSequences, 789/948 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...