/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 0.1.25-3af5e1f [2020-09-04 13:01:04,920 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-09-04 13:01:04,925 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-09-04 13:01:04,974 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-09-04 13:01:04,974 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-09-04 13:01:04,983 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-09-04 13:01:04,986 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-09-04 13:01:04,991 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-09-04 13:01:04,993 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-09-04 13:01:04,997 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-09-04 13:01:04,998 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-09-04 13:01:04,999 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-09-04 13:01:04,999 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-09-04 13:01:05,003 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-09-04 13:01:05,006 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-09-04 13:01:05,008 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-09-04 13:01:05,009 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-09-04 13:01:05,011 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-09-04 13:01:05,013 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-09-04 13:01:05,021 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-09-04 13:01:05,026 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-09-04 13:01:05,027 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-09-04 13:01:05,027 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-09-04 13:01:05,028 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-09-04 13:01:05,033 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-09-04 13:01:05,048 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-09-04 13:01:05,049 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-09-04 13:01:05,051 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-09-04 13:01:05,052 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-09-04 13:01:05,102 INFO L113 SettingsManager]: Loading preferences was successful [2020-09-04 13:01:05,102 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-09-04 13:01:05,105 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-09-04 13:01:05,105 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-09-04 13:01:05,106 INFO L138 SettingsManager]: * Use SBE=true [2020-09-04 13:01:05,106 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-09-04 13:01:05,106 INFO L138 SettingsManager]: * sizeof long=4 [2020-09-04 13:01:05,107 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-09-04 13:01:05,107 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-09-04 13:01:05,107 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-09-04 13:01:05,108 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-09-04 13:01:05,109 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-09-04 13:01:05,109 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-09-04 13:01:05,110 INFO L138 SettingsManager]: * sizeof long double=12 [2020-09-04 13:01:05,110 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-09-04 13:01:05,110 INFO L138 SettingsManager]: * Use constant arrays=true [2020-09-04 13:01:05,110 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-09-04 13:01:05,110 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-09-04 13:01:05,111 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-09-04 13:01:05,111 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-09-04 13:01:05,111 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-09-04 13:01:05,111 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-09-04 13:01:05,111 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-09-04 13:01:05,112 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-09-04 13:01:05,112 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-09-04 13:01:05,112 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-09-04 13:01:05,112 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-09-04 13:01:05,112 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-09-04 13:01:05,113 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-09-04 13:01:05,113 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2020-09-04 13:01:05,571 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-09-04 13:01:05,592 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-09-04 13:01:05,597 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-09-04 13:01:05,599 INFO L271 PluginConnector]: Initializing CDTParser... [2020-09-04 13:01:05,599 INFO L275 PluginConnector]: CDTParser initialized [2020-09-04 13:01:05,601 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive/Ackermann01-2.c [2020-09-04 13:01:05,687 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/89746ed98/88458970c2e34ba596d4dc51af509baa/FLAG801ef3240 [2020-09-04 13:01:06,241 INFO L306 CDTParser]: Found 1 translation units. [2020-09-04 13:01:06,241 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/recursive/Ackermann01-2.c [2020-09-04 13:01:06,250 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/89746ed98/88458970c2e34ba596d4dc51af509baa/FLAG801ef3240 [2020-09-04 13:01:06,583 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/89746ed98/88458970c2e34ba596d4dc51af509baa [2020-09-04 13:01:06,595 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-09-04 13:01:06,598 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-09-04 13:01:06,599 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-09-04 13:01:06,599 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-09-04 13:01:06,604 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-09-04 13:01:06,605 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 04.09 01:01:06" (1/1) ... [2020-09-04 13:01:06,610 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@790fb128 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:01:06, skipping insertion in model container [2020-09-04 13:01:06,610 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 04.09 01:01:06" (1/1) ... [2020-09-04 13:01:06,623 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-09-04 13:01:06,650 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-09-04 13:01:06,892 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-04 13:01:06,898 INFO L203 MainTranslator]: Completed pre-run [2020-09-04 13:01:06,924 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-04 13:01:06,946 INFO L208 MainTranslator]: Completed translation [2020-09-04 13:01:06,946 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:01:06 WrapperNode [2020-09-04 13:01:06,947 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-09-04 13:01:06,948 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-09-04 13:01:06,948 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-09-04 13:01:06,948 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-09-04 13:01:06,968 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:01:06" (1/1) ... [2020-09-04 13:01:06,969 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:01:06" (1/1) ... [2020-09-04 13:01:06,976 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:01:06" (1/1) ... [2020-09-04 13:01:06,977 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:01:06" (1/1) ... [2020-09-04 13:01:06,982 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:01:06" (1/1) ... [2020-09-04 13:01:06,985 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:01:06" (1/1) ... [2020-09-04 13:01:06,987 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:01:06" (1/1) ... [2020-09-04 13:01:06,989 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-09-04 13:01:06,990 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-09-04 13:01:06,990 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-09-04 13:01:06,990 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-09-04 13:01:06,992 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:01:06" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/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 [2020-09-04 13:01:07,223 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-09-04 13:01:07,223 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-09-04 13:01:07,223 INFO L138 BoogieDeclarations]: Found implementation of procedure ackermann [2020-09-04 13:01:07,223 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-09-04 13:01:07,224 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-09-04 13:01:07,224 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-09-04 13:01:07,224 INFO L130 BoogieDeclarations]: Found specification of procedure ackermann [2020-09-04 13:01:07,224 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-09-04 13:01:07,224 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-09-04 13:01:07,225 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-09-04 13:01:07,487 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-09-04 13:01:07,487 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-09-04 13:01:07,492 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 04.09 01:01:07 BoogieIcfgContainer [2020-09-04 13:01:07,493 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-09-04 13:01:07,494 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-09-04 13:01:07,495 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-09-04 13:01:07,498 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-09-04 13:01:07,499 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 04.09 01:01:06" (1/3) ... [2020-09-04 13:01:07,500 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@29a868f5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 04.09 01:01:07, skipping insertion in model container [2020-09-04 13:01:07,501 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:01:06" (2/3) ... [2020-09-04 13:01:07,501 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@29a868f5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 04.09 01:01:07, skipping insertion in model container [2020-09-04 13:01:07,501 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 04.09 01:01:07" (3/3) ... [2020-09-04 13:01:07,504 INFO L109 eAbstractionObserver]: Analyzing ICFG Ackermann01-2.c [2020-09-04 13:01:07,517 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-09-04 13:01:07,539 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-09-04 13:01:07,603 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-09-04 13:01:07,665 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-09-04 13:01:07,665 INFO L376 AbstractCegarLoop]: Hoare is true [2020-09-04 13:01:07,665 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-09-04 13:01:07,666 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-09-04 13:01:07,666 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-09-04 13:01:07,666 INFO L380 AbstractCegarLoop]: Difference is false [2020-09-04 13:01:07,666 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-09-04 13:01:07,666 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-09-04 13:01:07,688 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states. [2020-09-04 13:01:07,696 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-09-04 13:01:07,697 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 13:01:07,698 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 13:01:07,698 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 13:01:07,705 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 13:01:07,705 INFO L82 PathProgramCache]: Analyzing trace with hash -1796234678, now seen corresponding path program 1 times [2020-09-04 13:01:07,719 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-09-04 13:01:07,719 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1126550616] [2020-09-04 13:01:07,720 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 13:01:07,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:01:07,974 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 13:01:07,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:01:07,981 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-09-04 13:01:07,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:01:08,070 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 13:01:08,071 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1126550616] [2020-09-04 13:01:08,072 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 13:01:08,073 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2020-09-04 13:01:08,074 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1482338598] [2020-09-04 13:01:08,081 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-09-04 13:01:08,081 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-09-04 13:01:08,097 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-09-04 13:01:08,099 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-09-04 13:01:08,101 INFO L87 Difference]: Start difference. First operand 27 states. Second operand 7 states. [2020-09-04 13:01:08,356 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 13:01:08,356 INFO L93 Difference]: Finished difference Result 41 states and 51 transitions. [2020-09-04 13:01:08,357 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-09-04 13:01:08,359 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 15 [2020-09-04 13:01:08,360 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 13:01:08,375 INFO L225 Difference]: With dead ends: 41 [2020-09-04 13:01:08,375 INFO L226 Difference]: Without dead ends: 25 [2020-09-04 13:01:08,381 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 [2020-09-04 13:01:08,403 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-09-04 13:01:08,434 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-09-04 13:01:08,436 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-09-04 13:01:08,438 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 31 transitions. [2020-09-04 13:01:08,440 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 31 transitions. Word has length 15 [2020-09-04 13:01:08,440 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 13:01:08,441 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 31 transitions. [2020-09-04 13:01:08,441 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-09-04 13:01:08,441 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 31 transitions. [2020-09-04 13:01:08,443 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-09-04 13:01:08,444 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 13:01:08,444 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] [2020-09-04 13:01:08,445 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-09-04 13:01:08,446 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 13:01:08,446 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 13:01:08,447 INFO L82 PathProgramCache]: Analyzing trace with hash -895156504, now seen corresponding path program 1 times [2020-09-04 13:01:08,447 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-09-04 13:01:08,447 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [270357727] [2020-09-04 13:01:08,448 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 13:01:08,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:01:08,511 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 13:01:08,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:01:08,515 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-09-04 13:01:08,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:01:08,572 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-04 13:01:08,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:01:08,677 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-09-04 13:01:08,680 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [270357727] [2020-09-04 13:01:08,680 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 13:01:08,683 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-09-04 13:01:08,683 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1807354084] [2020-09-04 13:01:08,686 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-09-04 13:01:08,687 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-09-04 13:01:08,688 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-09-04 13:01:08,688 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-09-04 13:01:08,688 INFO L87 Difference]: Start difference. First operand 25 states and 31 transitions. Second operand 8 states. [2020-09-04 13:01:08,953 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 13:01:08,954 INFO L93 Difference]: Finished difference Result 32 states and 40 transitions. [2020-09-04 13:01:08,955 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-09-04 13:01:08,955 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 22 [2020-09-04 13:01:08,955 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 13:01:08,957 INFO L225 Difference]: With dead ends: 32 [2020-09-04 13:01:08,958 INFO L226 Difference]: Without dead ends: 28 [2020-09-04 13:01:08,962 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 [2020-09-04 13:01:08,963 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-09-04 13:01:08,976 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2020-09-04 13:01:08,981 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-09-04 13:01:08,983 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 32 transitions. [2020-09-04 13:01:08,984 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 32 transitions. Word has length 22 [2020-09-04 13:01:08,984 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 13:01:08,987 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 32 transitions. [2020-09-04 13:01:08,987 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-09-04 13:01:08,987 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 32 transitions. [2020-09-04 13:01:08,990 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-09-04 13:01:08,990 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 13:01:08,991 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] [2020-09-04 13:01:08,991 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-09-04 13:01:08,991 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 13:01:08,992 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 13:01:08,992 INFO L82 PathProgramCache]: Analyzing trace with hash 408363011, now seen corresponding path program 1 times [2020-09-04 13:01:08,992 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-09-04 13:01:08,993 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [520088405] [2020-09-04 13:01:08,994 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 13:01:09,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:01:09,077 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 13:01:09,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:01:09,094 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-09-04 13:01:09,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:01:09,114 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-04 13:01:09,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:01:09,133 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2020-09-04 13:01:09,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:01:09,141 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 5 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-09-04 13:01:09,141 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [520088405] [2020-09-04 13:01:09,142 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1126538374] [2020-09-04 13:01:09,142 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate-2/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 [2020-09-04 13:01:09,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:01:09,191 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 6 conjunts are in the unsatisfiable core [2020-09-04 13:01:09,199 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-09-04 13:01:09,390 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-09-04 13:01:09,392 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-09-04 13:01:09,392 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 7] total 10 [2020-09-04 13:01:09,393 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1493292660] [2020-09-04 13:01:09,394 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-09-04 13:01:09,394 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-09-04 13:01:09,395 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-09-04 13:01:09,395 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2020-09-04 13:01:09,395 INFO L87 Difference]: Start difference. First operand 26 states and 32 transitions. Second operand 10 states. [2020-09-04 13:01:09,623 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 13:01:09,623 INFO L93 Difference]: Finished difference Result 51 states and 78 transitions. [2020-09-04 13:01:09,625 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-09-04 13:01:09,625 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 28 [2020-09-04 13:01:09,627 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 13:01:09,630 INFO L225 Difference]: With dead ends: 51 [2020-09-04 13:01:09,630 INFO L226 Difference]: Without dead ends: 33 [2020-09-04 13:01:09,633 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 [2020-09-04 13:01:09,635 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-09-04 13:01:09,650 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 28. [2020-09-04 13:01:09,650 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-09-04 13:01:09,655 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 35 transitions. [2020-09-04 13:01:09,656 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 35 transitions. Word has length 28 [2020-09-04 13:01:09,657 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 13:01:09,657 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 35 transitions. [2020-09-04 13:01:09,657 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-09-04 13:01:09,657 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 35 transitions. [2020-09-04 13:01:09,662 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-09-04 13:01:09,662 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 13:01:09,663 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] [2020-09-04 13:01:09,876 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2020-09-04 13:01:09,877 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 13:01:09,878 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 13:01:09,878 INFO L82 PathProgramCache]: Analyzing trace with hash 718507263, now seen corresponding path program 1 times [2020-09-04 13:01:09,878 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-09-04 13:01:09,879 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1479650901] [2020-09-04 13:01:09,879 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 13:01:09,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:01:09,970 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 13:01:09,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:01:09,972 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-09-04 13:01:09,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:01:10,033 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-04 13:01:10,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:01:10,069 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-04 13:01:10,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:01:10,123 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2020-09-04 13:01:10,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:01:10,163 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 13 proven. 4 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2020-09-04 13:01:10,164 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1479650901] [2020-09-04 13:01:10,164 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [598449495] [2020-09-04 13:01:10,164 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate-2/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 [2020-09-04 13:01:10,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:01:10,205 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 14 conjunts are in the unsatisfiable core [2020-09-04 13:01:10,208 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-09-04 13:01:10,279 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 6 proven. 8 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-09-04 13:01:10,279 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-09-04 13:01:10,279 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 11] total 14 [2020-09-04 13:01:10,280 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1274347639] [2020-09-04 13:01:10,280 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-09-04 13:01:10,281 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-09-04 13:01:10,281 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-09-04 13:01:10,281 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=151, Unknown=0, NotChecked=0, Total=182 [2020-09-04 13:01:10,282 INFO L87 Difference]: Start difference. First operand 28 states and 35 transitions. Second operand 14 states. [2020-09-04 13:01:10,828 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 13:01:10,828 INFO L93 Difference]: Finished difference Result 54 states and 87 transitions. [2020-09-04 13:01:10,828 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-09-04 13:01:10,828 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 35 [2020-09-04 13:01:10,829 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 13:01:10,833 INFO L225 Difference]: With dead ends: 54 [2020-09-04 13:01:10,833 INFO L226 Difference]: Without dead ends: 50 [2020-09-04 13:01:10,835 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=124, Invalid=476, Unknown=0, NotChecked=0, Total=600 [2020-09-04 13:01:10,835 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-09-04 13:01:10,849 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 36. [2020-09-04 13:01:10,849 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-09-04 13:01:10,851 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 53 transitions. [2020-09-04 13:01:10,851 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 53 transitions. Word has length 35 [2020-09-04 13:01:10,852 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 13:01:10,852 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 53 transitions. [2020-09-04 13:01:10,852 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-09-04 13:01:10,852 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 53 transitions. [2020-09-04 13:01:10,854 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-09-04 13:01:10,855 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 13:01:10,855 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] [2020-09-04 13:01:11,069 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-09-04 13:01:11,070 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 13:01:11,070 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 13:01:11,071 INFO L82 PathProgramCache]: Analyzing trace with hash -1711672813, now seen corresponding path program 2 times [2020-09-04 13:01:11,071 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-09-04 13:01:11,071 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [959877933] [2020-09-04 13:01:11,072 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 13:01:11,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:01:11,118 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 13:01:11,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:01:11,120 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-09-04 13:01:11,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:01:11,163 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-04 13:01:11,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:01:11,201 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-04 13:01:11,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:01:11,234 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-04 13:01:11,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:01:11,280 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2020-09-04 13:01:11,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:01:11,323 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 20 proven. 6 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2020-09-04 13:01:11,323 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [959877933] [2020-09-04 13:01:11,324 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [231206359] [2020-09-04 13:01:11,324 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-2/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 [2020-09-04 13:01:11,363 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-09-04 13:01:11,364 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-09-04 13:01:11,365 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 16 conjunts are in the unsatisfiable core [2020-09-04 13:01:11,368 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-09-04 13:01:11,433 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 11 proven. 12 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2020-09-04 13:01:11,433 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-09-04 13:01:11,433 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12] total 15 [2020-09-04 13:01:11,434 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [503891407] [2020-09-04 13:01:11,434 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-09-04 13:01:11,435 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-09-04 13:01:11,435 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-09-04 13:01:11,435 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=176, Unknown=0, NotChecked=0, Total=210 [2020-09-04 13:01:11,436 INFO L87 Difference]: Start difference. First operand 36 states and 53 transitions. Second operand 15 states. [2020-09-04 13:01:12,125 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 13:01:12,126 INFO L93 Difference]: Finished difference Result 65 states and 116 transitions. [2020-09-04 13:01:12,126 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-09-04 13:01:12,127 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 42 [2020-09-04 13:01:12,127 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 13:01:12,129 INFO L225 Difference]: With dead ends: 65 [2020-09-04 13:01:12,130 INFO L226 Difference]: Without dead ends: 61 [2020-09-04 13:01:12,131 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=137, Invalid=565, Unknown=0, NotChecked=0, Total=702 [2020-09-04 13:01:12,132 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-09-04 13:01:12,147 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 34. [2020-09-04 13:01:12,147 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-09-04 13:01:12,148 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 47 transitions. [2020-09-04 13:01:12,148 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 47 transitions. Word has length 42 [2020-09-04 13:01:12,149 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 13:01:12,149 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 47 transitions. [2020-09-04 13:01:12,149 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-09-04 13:01:12,149 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 47 transitions. [2020-09-04 13:01:12,150 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-09-04 13:01:12,151 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 13:01:12,151 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] [2020-09-04 13:01:12,356 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-09-04 13:01:12,357 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 13:01:12,357 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 13:01:12,358 INFO L82 PathProgramCache]: Analyzing trace with hash -1051926487, now seen corresponding path program 3 times [2020-09-04 13:01:12,358 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-09-04 13:01:12,359 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [523779742] [2020-09-04 13:01:12,359 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 13:01:12,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:01:12,389 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 13:01:12,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:01:12,391 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-09-04 13:01:12,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:01:12,419 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-04 13:01:12,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:01:12,450 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-04 13:01:12,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:01:12,488 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2020-09-04 13:01:12,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:01:12,518 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-04 13:01:12,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:01:12,534 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 16 proven. 9 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2020-09-04 13:01:12,535 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [523779742] [2020-09-04 13:01:12,535 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1972698513] [2020-09-04 13:01:12,535 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate-2/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 [2020-09-04 13:01:12,572 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2020-09-04 13:01:12,573 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-09-04 13:01:12,574 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 10 conjunts are in the unsatisfiable core [2020-09-04 13:01:12,578 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-09-04 13:01:12,714 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 17 proven. 4 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2020-09-04 13:01:12,714 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-09-04 13:01:12,714 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 14 [2020-09-04 13:01:12,720 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [409667089] [2020-09-04 13:01:12,721 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-09-04 13:01:12,721 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-09-04 13:01:12,721 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-09-04 13:01:12,722 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=156, Unknown=0, NotChecked=0, Total=182 [2020-09-04 13:01:12,722 INFO L87 Difference]: Start difference. First operand 34 states and 47 transitions. Second operand 14 states. [2020-09-04 13:01:13,248 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 13:01:13,249 INFO L93 Difference]: Finished difference Result 81 states and 138 transitions. [2020-09-04 13:01:13,250 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-09-04 13:01:13,251 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 42 [2020-09-04 13:01:13,251 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 13:01:13,253 INFO L225 Difference]: With dead ends: 81 [2020-09-04 13:01:13,253 INFO L226 Difference]: Without dead ends: 53 [2020-09-04 13:01:13,255 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 [2020-09-04 13:01:13,259 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-09-04 13:01:13,280 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2020-09-04 13:01:13,281 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-09-04 13:01:13,284 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 81 transitions. [2020-09-04 13:01:13,284 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 81 transitions. Word has length 42 [2020-09-04 13:01:13,287 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 13:01:13,287 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 81 transitions. [2020-09-04 13:01:13,288 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-09-04 13:01:13,288 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 81 transitions. [2020-09-04 13:01:13,296 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2020-09-04 13:01:13,296 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 13:01:13,296 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] [2020-09-04 13:01:13,513 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-09-04 13:01:13,514 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 13:01:13,514 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 13:01:13,514 INFO L82 PathProgramCache]: Analyzing trace with hash -2003160496, now seen corresponding path program 4 times [2020-09-04 13:01:13,515 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-09-04 13:01:13,516 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [251685251] [2020-09-04 13:01:13,516 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 13:01:13,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:01:13,547 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 13:01:13,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:01:13,551 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-09-04 13:01:13,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:01:13,574 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-04 13:01:13,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:01:13,594 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-04 13:01:13,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:01:13,612 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-04 13:01:13,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:01:13,647 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-04 13:01:13,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:01:13,653 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-09-04 13:01:13,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:01:13,662 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-04 13:01:13,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:01:13,667 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 43 [2020-09-04 13:01:13,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:01:13,677 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 32 proven. 22 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2020-09-04 13:01:13,677 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [251685251] [2020-09-04 13:01:13,678 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1755345882] [2020-09-04 13:01:13,678 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate-2/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 [2020-09-04 13:01:13,738 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-09-04 13:01:13,738 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-09-04 13:01:13,739 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 3 conjunts are in the unsatisfiable core [2020-09-04 13:01:13,758 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-09-04 13:01:13,803 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 71 proven. 1 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2020-09-04 13:01:13,803 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-09-04 13:01:13,804 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 6 [2020-09-04 13:01:13,808 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1543479998] [2020-09-04 13:01:13,810 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-09-04 13:01:13,812 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-09-04 13:01:13,813 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-09-04 13:01:13,813 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-09-04 13:01:13,813 INFO L87 Difference]: Start difference. First operand 53 states and 81 transitions. Second operand 6 states. [2020-09-04 13:01:13,880 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 13:01:13,880 INFO L93 Difference]: Finished difference Result 101 states and 188 transitions. [2020-09-04 13:01:13,883 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-09-04 13:01:13,883 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 62 [2020-09-04 13:01:13,884 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 13:01:13,886 INFO L225 Difference]: With dead ends: 101 [2020-09-04 13:01:13,886 INFO L226 Difference]: Without dead ends: 56 [2020-09-04 13:01:13,889 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 [2020-09-04 13:01:13,890 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-09-04 13:01:13,907 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2020-09-04 13:01:13,907 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-09-04 13:01:13,910 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 87 transitions. [2020-09-04 13:01:13,911 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 87 transitions. Word has length 62 [2020-09-04 13:01:13,911 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 13:01:13,911 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 87 transitions. [2020-09-04 13:01:13,911 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-09-04 13:01:13,912 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 87 transitions. [2020-09-04 13:01:13,919 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2020-09-04 13:01:13,919 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 13:01:13,919 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] [2020-09-04 13:01:14,136 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2020-09-04 13:01:14,136 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 13:01:14,137 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 13:01:14,137 INFO L82 PathProgramCache]: Analyzing trace with hash 1483482771, now seen corresponding path program 5 times [2020-09-04 13:01:14,137 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-09-04 13:01:14,138 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [790025325] [2020-09-04 13:01:14,138 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 13:01:14,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:01:14,204 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 13:01:14,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:01:14,208 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-09-04 13:01:14,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:01:14,260 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-04 13:01:14,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:01:14,304 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-04 13:01:14,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:01:14,338 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-04 13:01:14,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:01:14,382 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-04 13:01:14,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:01:14,414 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-04 13:01:14,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:01:14,462 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2020-09-04 13:01:14,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:01:14,508 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 36 [2020-09-04 13:01:14,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:01:14,537 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-04 13:01:14,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:01:14,546 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 56 [2020-09-04 13:01:14,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:01:14,605 INFO L134 CoverageAnalysis]: Checked inductivity of 213 backedges. 83 proven. 50 refuted. 0 times theorem prover too weak. 80 trivial. 0 not checked. [2020-09-04 13:01:14,606 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [790025325] [2020-09-04 13:01:14,607 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1954685591] [2020-09-04 13:01:14,607 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-2/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 [2020-09-04 13:01:14,661 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2020-09-04 13:01:14,661 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-09-04 13:01:14,663 INFO L263 TraceCheckSpWp]: Trace formula consists of 150 conjuncts, 17 conjunts are in the unsatisfiable core [2020-09-04 13:01:14,679 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-09-04 13:01:14,791 INFO L134 CoverageAnalysis]: Checked inductivity of 213 backedges. 97 proven. 37 refuted. 0 times theorem prover too weak. 79 trivial. 0 not checked. [2020-09-04 13:01:14,792 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-09-04 13:01:14,792 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 12] total 19 [2020-09-04 13:01:14,792 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [470352864] [2020-09-04 13:01:14,794 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-09-04 13:01:14,794 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-09-04 13:01:14,794 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-09-04 13:01:14,795 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=296, Unknown=0, NotChecked=0, Total=342 [2020-09-04 13:01:14,795 INFO L87 Difference]: Start difference. First operand 56 states and 87 transitions. Second operand 19 states. [2020-09-04 13:01:15,582 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 13:01:15,583 INFO L93 Difference]: Finished difference Result 101 states and 206 transitions. [2020-09-04 13:01:15,583 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-09-04 13:01:15,584 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 75 [2020-09-04 13:01:15,584 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 13:01:15,584 INFO L225 Difference]: With dead ends: 101 [2020-09-04 13:01:15,585 INFO L226 Difference]: Without dead ends: 0 [2020-09-04 13:01:15,588 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 99 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 180 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=292, Invalid=1114, Unknown=0, NotChecked=0, Total=1406 [2020-09-04 13:01:15,589 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-09-04 13:01:15,589 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-09-04 13:01:15,589 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-09-04 13:01:15,589 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-09-04 13:01:15,590 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 75 [2020-09-04 13:01:15,590 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 13:01:15,590 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-09-04 13:01:15,590 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-09-04 13:01:15,590 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-09-04 13:01:15,590 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-09-04 13:01:15,791 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-09-04 13:01:15,795 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-09-04 13:01:16,535 WARN L193 SmtUtils]: Spent 235.00 ms on a formula simplification. DAG size of input: 41 DAG size of output: 25 [2020-09-04 13:01:16,606 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-09-04 13:01:16,607 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-09-04 13:01:16,607 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-09-04 13:01:16,607 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-09-04 13:01:16,607 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-09-04 13:01:16,607 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-09-04 13:01:16,608 INFO L268 CegarLoopResult]: For program point ackermannEXIT(lines 15 23) no Hoare annotation was computed. [2020-09-04 13:01:16,608 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|)) [2020-09-04 13:01:16,608 INFO L271 CegarLoopResult]: At program point ackermannENTRY(lines 15 23) the Hoare annotation is: true [2020-09-04 13:01:16,609 INFO L268 CegarLoopResult]: For program point L22-1(line 22) no Hoare annotation was computed. [2020-09-04 13:01:16,609 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|)) [2020-09-04 13:01:16,609 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))))) [2020-09-04 13:01:16,610 INFO L268 CegarLoopResult]: For program point L19(lines 19 21) no Hoare annotation was computed. [2020-09-04 13:01:16,610 INFO L268 CegarLoopResult]: For program point L20-1(line 20) no Hoare annotation was computed. [2020-09-04 13:01:16,610 INFO L268 CegarLoopResult]: For program point L22-3(line 22) no Hoare annotation was computed. [2020-09-04 13:01:16,610 INFO L268 CegarLoopResult]: For program point L16(lines 16 18) no Hoare annotation was computed. [2020-09-04 13:01:16,610 INFO L268 CegarLoopResult]: For program point ackermannFINAL(lines 15 23) no Hoare annotation was computed. [2020-09-04 13:01:16,611 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 44) no Hoare annotation was computed. [2020-09-04 13:01:16,611 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 26 46) the Hoare annotation is: true [2020-09-04 13:01:16,611 INFO L268 CegarLoopResult]: For program point L28(lines 28 32) no Hoare annotation was computed. [2020-09-04 13:01:16,611 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 26 46) no Hoare annotation was computed. [2020-09-04 13:01:16,612 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 26 46) no Hoare annotation was computed. [2020-09-04 13:01:16,612 INFO L268 CegarLoopResult]: For program point L44(line 44) no Hoare annotation was computed. [2020-09-04 13:01:16,612 INFO L268 CegarLoopResult]: For program point L41(lines 41 45) no Hoare annotation was computed. [2020-09-04 13:01:16,612 INFO L264 CegarLoopResult]: At program point L40(line 40) the Hoare annotation is: (<= 0 main_~n~0) [2020-09-04 13:01:16,613 INFO L268 CegarLoopResult]: For program point L40-1(line 40) no Hoare annotation was computed. [2020-09-04 13:01:16,613 INFO L268 CegarLoopResult]: For program point L34(lines 34 39) no Hoare annotation was computed. [2020-09-04 13:01:16,621 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 04.09 01:01:16 BoogieIcfgContainer [2020-09-04 13:01:16,621 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-09-04 13:01:16,624 INFO L168 Benchmark]: Toolchain (without parser) took 10026.52 ms. Allocated memory was 141.6 MB in the beginning and 278.9 MB in the end (delta: 137.4 MB). Free memory was 103.6 MB in the beginning and 147.7 MB in the end (delta: -44.2 MB). Peak memory consumption was 93.2 MB. Max. memory is 7.1 GB. [2020-09-04 13:01:16,625 INFO L168 Benchmark]: CDTParser took 0.66 ms. Allocated memory is still 141.6 MB. Free memory was 121.8 MB in the beginning and 121.6 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. [2020-09-04 13:01:16,625 INFO L168 Benchmark]: CACSL2BoogieTranslator took 348.43 ms. Allocated memory is still 141.6 MB. Free memory was 103.1 MB in the beginning and 93.7 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.5 MB. Max. memory is 7.1 GB. [2020-09-04 13:01:16,626 INFO L168 Benchmark]: Boogie Preprocessor took 41.95 ms. Allocated memory is still 141.6 MB. Free memory was 93.7 MB in the beginning and 92.3 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. [2020-09-04 13:01:16,627 INFO L168 Benchmark]: RCFGBuilder took 503.15 ms. Allocated memory was 141.6 MB in the beginning and 207.6 MB in the end (delta: 66.1 MB). Free memory was 92.3 MB in the beginning and 174.1 MB in the end (delta: -81.8 MB). Peak memory consumption was 12.4 MB. Max. memory is 7.1 GB. [2020-09-04 13:01:16,628 INFO L168 Benchmark]: TraceAbstraction took 9127.03 ms. Allocated memory was 207.6 MB in the beginning and 278.9 MB in the end (delta: 71.3 MB). Free memory was 173.4 MB in the beginning and 147.7 MB in the end (delta: 25.7 MB). Peak memory consumption was 97.0 MB. Max. memory is 7.1 GB. [2020-09-04 13:01:16,632 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.66 ms. Allocated memory is still 141.6 MB. Free memory was 121.8 MB in the beginning and 121.6 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 348.43 ms. Allocated memory is still 141.6 MB. Free memory was 103.1 MB in the beginning and 93.7 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.5 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 41.95 ms. Allocated memory is still 141.6 MB. Free memory was 93.7 MB in the beginning and 92.3 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 503.15 ms. Allocated memory was 141.6 MB in the beginning and 207.6 MB in the end (delta: 66.1 MB). Free memory was 92.3 MB in the beginning and 174.1 MB in the end (delta: -81.8 MB). Peak memory consumption was 12.4 MB. Max. memory is 7.1 GB. * TraceAbstraction took 9127.03 ms. Allocated memory was 207.6 MB in the beginning and 278.9 MB in the end (delta: 71.3 MB). Free memory was 173.4 MB in the beginning and 147.7 MB in the end (delta: 25.7 MB). Peak memory consumption was 97.0 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: 8.1s, OverallIterations: 8, TraceHistogramMax: 10, AutomataDifference: 3.4s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.8s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 174 SDtfs, 193 SDslu, 849 SDs, 0 SdLazy, 1587 SolverSat, 301 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.5s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 517 GetRequests, 377 SyntacticMatches, 0 SemanticMatches, 140 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 369 ImplicationChecksByTransitivity, 2.2s 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, 0.4s HoareSimplificationTime, 9 FomulaSimplificationsInter, 317 FormulaSimplificationTreeSizeReductionInter, 0.3s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.3s SatisfiabilityAnalysisTime, 2.4s 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...