/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks NOT_INCREMENTALLY -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/id_o100.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 11:08:35,703 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 11:08:35,707 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 11:08:35,739 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 11:08:35,740 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 11:08:35,742 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 11:08:35,744 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 11:08:35,747 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 11:08:35,750 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 11:08:35,752 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 11:08:35,754 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 11:08:35,756 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 11:08:35,757 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 11:08:35,759 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 11:08:35,761 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 11:08:35,763 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 11:08:35,765 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 11:08:35,767 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 11:08:35,770 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 11:08:35,774 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 11:08:35,777 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 11:08:35,779 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 11:08:35,781 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 11:08:35,783 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 11:08:35,788 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 11:08:35,803 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 11:08:35,805 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 11:08:35,807 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 11:08:35,808 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 [2020-07-21 11:08:35,833 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 11:08:35,834 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 11:08:35,836 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 11:08:35,837 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 11:08:35,837 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 11:08:35,837 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 11:08:35,838 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 11:08:35,838 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 11:08:35,839 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 11:08:35,839 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 11:08:35,839 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 11:08:35,839 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 11:08:35,840 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 11:08:35,840 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 11:08:35,840 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 11:08:35,840 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 11:08:35,841 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 11:08:35,841 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 11:08:35,841 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 11:08:35,841 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 11:08:35,842 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 11:08:35,842 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 11:08:35,842 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 11:08:35,842 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 11:08:35,843 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 11:08:35,843 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 11:08:35,843 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:08:35,844 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 11:08:35,844 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 11:08:35,844 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> NOT_INCREMENTALLY [2020-07-21 11:08:36,281 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 11:08:36,303 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 11:08:36,309 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 11:08:36,311 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 11:08:36,312 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 11:08:36,314 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/id_o100.c [2020-07-21 11:08:36,426 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/89def255c/d12cdf0b684e45f79851b9d1d61cc043/FLAGf3fba9e55 [2020-07-21 11:08:37,218 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 11:08:37,220 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/id_o100.c [2020-07-21 11:08:37,234 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/89def255c/d12cdf0b684e45f79851b9d1d61cc043/FLAGf3fba9e55 [2020-07-21 11:08:37,472 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/89def255c/d12cdf0b684e45f79851b9d1d61cc043 [2020-07-21 11:08:37,499 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 11:08:37,505 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 11:08:37,510 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 11:08:37,511 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 11:08:37,518 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 11:08:37,520 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 11:08:37" (1/1) ... [2020-07-21 11:08:37,527 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7adbdb49 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:08:37, skipping insertion in model container [2020-07-21 11:08:37,527 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 11:08:37" (1/1) ... [2020-07-21 11:08:37,543 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 11:08:37,575 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 11:08:37,883 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 11:08:37,897 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 11:08:37,935 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 11:08:37,964 INFO L208 MainTranslator]: Completed translation [2020-07-21 11:08:37,965 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:08:37 WrapperNode [2020-07-21 11:08:37,965 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 11:08:37,968 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 11:08:37,968 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 11:08:37,969 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 11:08:37,986 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:08:37" (1/1) ... [2020-07-21 11:08:37,987 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:08:37" (1/1) ... [2020-07-21 11:08:37,995 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:08:37" (1/1) ... [2020-07-21 11:08:37,996 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:08:37" (1/1) ... [2020-07-21 11:08:38,003 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:08:37" (1/1) ... [2020-07-21 11:08:38,007 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:08:37" (1/1) ... [2020-07-21 11:08:38,009 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:08:37" (1/1) ... [2020-07-21 11:08:38,012 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 11:08:38,013 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 11:08:38,014 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 11:08:38,014 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 11:08:38,016 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:08:37" (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 [2020-07-21 11:08:38,257 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 11:08:38,258 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 11:08:38,258 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2020-07-21 11:08:38,258 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 11:08:38,259 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-07-21 11:08:38,259 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 11:08:38,259 INFO L130 BoogieDeclarations]: Found specification of procedure id [2020-07-21 11:08:38,259 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 11:08:38,260 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 11:08:38,260 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 11:08:38,535 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 11:08:38,536 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 11:08:38,543 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 11:08:38 BoogieIcfgContainer [2020-07-21 11:08:38,544 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 11:08:38,547 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 11:08:38,547 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 11:08:38,553 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 11:08:38,554 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 11:08:37" (1/3) ... [2020-07-21 11:08:38,556 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@853bb27 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 11:08:38, skipping insertion in model container [2020-07-21 11:08:38,557 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:08:37" (2/3) ... [2020-07-21 11:08:38,558 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@853bb27 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 11:08:38, skipping insertion in model container [2020-07-21 11:08:38,558 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 11:08:38" (3/3) ... [2020-07-21 11:08:38,562 INFO L109 eAbstractionObserver]: Analyzing ICFG id_o100.c [2020-07-21 11:08:38,580 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 11:08:38,595 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 11:08:38,619 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 11:08:38,663 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 11:08:38,663 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 11:08:38,664 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 11:08:38,664 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 11:08:38,664 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 11:08:38,664 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 11:08:38,664 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 11:08:38,665 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 11:08:38,698 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-07-21 11:08:38,709 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 11:08:38,710 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:08:38,712 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:08:38,713 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:08:38,721 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:08:38,722 INFO L82 PathProgramCache]: Analyzing trace with hash -872342019, now seen corresponding path program 1 times [2020-07-21 11:08:38,734 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:08:38,735 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1828472575] [2020-07-21 11:08:38,736 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 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:08:38,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:08:38,836 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-21 11:08:38,849 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:08:39,092 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:08:39,093 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 11:08:39,095 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1828472575] [2020-07-21 11:08:39,098 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 11:08:39,099 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 11:08:39,102 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1566359006] [2020-07-21 11:08:39,113 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 11:08:39,114 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:08:39,135 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 11:08:39,136 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 11:08:39,144 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 5 states. [2020-07-21 11:08:39,248 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:08:39,248 INFO L93 Difference]: Finished difference Result 32 states and 35 transitions. [2020-07-21 11:08:39,249 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 11:08:39,252 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 11:08:39,253 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:08:39,271 INFO L225 Difference]: With dead ends: 32 [2020-07-21 11:08:39,272 INFO L226 Difference]: Without dead ends: 18 [2020-07-21 11:08:39,283 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 11:08:39,312 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-07-21 11:08:39,354 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-07-21 11:08:39,356 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-07-21 11:08:39,358 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2020-07-21 11:08:39,361 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2020-07-21 11:08:39,362 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:08:39,362 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2020-07-21 11:08:39,363 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 11:08:39,363 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2020-07-21 11:08:39,366 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-21 11:08:39,366 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:08:39,367 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:08:39,583 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:08:39,584 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:08:39,585 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:08:39,585 INFO L82 PathProgramCache]: Analyzing trace with hash -953570577, now seen corresponding path program 1 times [2020-07-21 11:08:39,585 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:08:39,586 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [391776446] [2020-07-21 11:08:39,586 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 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:08:39,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:08:39,642 INFO L263 TraceCheckSpWp]: Trace formula consists of 42 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-21 11:08:39,645 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:08:39,772 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-21 11:08:39,772 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:08:40,129 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-21 11:08:40,130 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [391776446] [2020-07-21 11:08:40,131 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:08:40,131 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2020-07-21 11:08:40,132 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1320401943] [2020-07-21 11:08:40,135 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 11:08:40,136 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:08:40,137 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 11:08:40,138 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2020-07-21 11:08:40,139 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 12 states. [2020-07-21 11:08:40,309 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:08:40,310 INFO L93 Difference]: Finished difference Result 30 states and 32 transitions. [2020-07-21 11:08:40,311 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 11:08:40,311 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 19 [2020-07-21 11:08:40,312 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:08:40,313 INFO L225 Difference]: With dead ends: 30 [2020-07-21 11:08:40,314 INFO L226 Difference]: Without dead ends: 24 [2020-07-21 11:08:40,316 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2020-07-21 11:08:40,317 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-07-21 11:08:40,325 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-07-21 11:08:40,326 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-07-21 11:08:40,328 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2020-07-21 11:08:40,328 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 19 [2020-07-21 11:08:40,329 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:08:40,329 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2020-07-21 11:08:40,329 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 11:08:40,330 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2020-07-21 11:08:40,331 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-21 11:08:40,332 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:08:40,332 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:08:40,547 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:08:40,548 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:08:40,549 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:08:40,550 INFO L82 PathProgramCache]: Analyzing trace with hash 1198310127, now seen corresponding path program 2 times [2020-07-21 11:08:40,551 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:08:40,551 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [79258323] [2020-07-21 11:08:40,551 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:08:40,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:08:40,603 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-21 11:08:40,607 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:08:40,798 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-07-21 11:08:40,799 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:08:43,743 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 13 refuted. 2 times theorem prover too weak. 15 trivial. 0 not checked. [2020-07-21 11:08:43,746 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [79258323] [2020-07-21 11:08:43,747 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:08:43,747 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 20 [2020-07-21 11:08:43,747 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [744794196] [2020-07-21 11:08:43,752 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-21 11:08:43,752 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:08:43,754 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-21 11:08:43,756 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=315, Unknown=1, NotChecked=0, Total=380 [2020-07-21 11:08:43,756 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 20 states. [2020-07-21 11:08:48,544 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:08:48,545 INFO L93 Difference]: Finished difference Result 42 states and 46 transitions. [2020-07-21 11:08:48,548 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-07-21 11:08:48,548 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 31 [2020-07-21 11:08:48,549 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:08:48,551 INFO L225 Difference]: With dead ends: 42 [2020-07-21 11:08:48,551 INFO L226 Difference]: Without dead ends: 36 [2020-07-21 11:08:48,555 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 7.1s TimeCoverageRelationStatistics Valid=97, Invalid=452, Unknown=3, NotChecked=0, Total=552 [2020-07-21 11:08:48,557 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-07-21 11:08:48,574 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-07-21 11:08:48,575 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 11:08:48,581 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2020-07-21 11:08:48,582 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 31 [2020-07-21 11:08:48,583 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:08:48,583 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2020-07-21 11:08:48,583 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-21 11:08:48,585 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2020-07-21 11:08:48,595 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-07-21 11:08:48,595 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:08:48,596 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:08:48,797 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:08:48,798 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:08:48,799 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:08:48,799 INFO L82 PathProgramCache]: Analyzing trace with hash 1532150511, now seen corresponding path program 3 times [2020-07-21 11:08:48,800 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:08:48,801 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [722508047] [2020-07-21 11:08:48,801 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:08:48,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:08:48,849 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 35 conjunts are in the unsatisfiable core [2020-07-21 11:08:48,855 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:08:49,202 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2020-07-21 11:08:49,203 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:08:59,692 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 75 refuted. 2 times theorem prover too weak. 77 trivial. 0 not checked. [2020-07-21 11:08:59,693 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [722508047] [2020-07-21 11:08:59,694 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:08:59,694 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 36 [2020-07-21 11:08:59,695 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [452240470] [2020-07-21 11:08:59,696 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-07-21 11:08:59,696 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:08:59,697 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-07-21 11:08:59,698 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=1072, Unknown=4, NotChecked=0, Total=1260 [2020-07-21 11:08:59,699 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand 36 states. [2020-07-21 11:09:00,606 WARN L193 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 38 DAG size of output: 13 [2020-07-21 11:09:01,454 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 36 DAG size of output: 11 [2020-07-21 11:09:16,214 WARN L193 SmtUtils]: Spent 2.11 s on a formula simplification. DAG size of input: 18 DAG size of output: 13 [2020-07-21 11:09:22,707 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:09:22,707 INFO L93 Difference]: Finished difference Result 66 states and 74 transitions. [2020-07-21 11:09:22,709 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-07-21 11:09:22,709 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 55 [2020-07-21 11:09:22,710 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:09:22,712 INFO L225 Difference]: With dead ends: 66 [2020-07-21 11:09:22,712 INFO L226 Difference]: Without dead ends: 60 [2020-07-21 11:09:22,714 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 155 ImplicationChecksByTransitivity, 32.3s TimeCoverageRelationStatistics Valid=380, Invalid=1868, Unknown=8, NotChecked=0, Total=2256 [2020-07-21 11:09:22,715 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-07-21 11:09:22,724 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2020-07-21 11:09:22,724 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-07-21 11:09:22,726 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 61 transitions. [2020-07-21 11:09:22,726 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 61 transitions. Word has length 55 [2020-07-21 11:09:22,727 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:09:22,727 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 61 transitions. [2020-07-21 11:09:22,727 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-07-21 11:09:22,727 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 61 transitions. [2020-07-21 11:09:22,729 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2020-07-21 11:09:22,730 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:09:22,730 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:09:22,933 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:09:22,935 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:09:22,935 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:09:22,935 INFO L82 PathProgramCache]: Analyzing trace with hash 1083048687, now seen corresponding path program 4 times [2020-07-21 11:09:22,936 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:09:22,937 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [170182910] [2020-07-21 11:09:22,937 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:09:23,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:09:23,012 INFO L263 TraceCheckSpWp]: Trace formula consists of 210 conjuncts, 67 conjunts are in the unsatisfiable core [2020-07-21 11:09:23,019 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:09:23,719 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2020-07-21 11:09:23,720 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:09:58,307 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 328 refuted. 17 times theorem prover too weak. 345 trivial. 0 not checked. [2020-07-21 11:09:58,308 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [170182910] [2020-07-21 11:09:58,309 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:09:58,309 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35] total 68 [2020-07-21 11:09:58,309 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [10522624] [2020-07-21 11:09:58,310 INFO L459 AbstractCegarLoop]: Interpolant automaton has 68 states [2020-07-21 11:09:58,310 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:09:58,311 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2020-07-21 11:09:58,313 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=616, Invalid=3926, Unknown=14, NotChecked=0, Total=4556 [2020-07-21 11:09:58,314 INFO L87 Difference]: Start difference. First operand 60 states and 61 transitions. Second operand 68 states. [2020-07-21 11:10:03,072 WARN L193 SmtUtils]: Spent 699.00 ms on a formula simplification. DAG size of input: 78 DAG size of output: 13 [2020-07-21 11:10:11,160 WARN L193 SmtUtils]: Spent 2.92 s on a formula simplification. DAG size of input: 76 DAG size of output: 11 [2020-07-21 11:10:14,632 WARN L193 SmtUtils]: Spent 425.00 ms on a formula simplification. DAG size of input: 73 DAG size of output: 13 [2020-07-21 11:10:19,025 WARN L193 SmtUtils]: Spent 684.00 ms on a formula simplification. DAG size of input: 71 DAG size of output: 11 [2020-07-21 11:10:25,429 WARN L193 SmtUtils]: Spent 2.60 s on a formula simplification. DAG size of input: 68 DAG size of output: 13 [2020-07-21 11:10:32,628 WARN L193 SmtUtils]: Spent 2.37 s on a formula simplification. DAG size of input: 66 DAG size of output: 11 [2020-07-21 11:10:39,571 WARN L193 SmtUtils]: Spent 1.34 s on a formula simplification. DAG size of input: 63 DAG size of output: 13 [2020-07-21 11:10:43,132 WARN L193 SmtUtils]: Spent 391.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 11 [2020-07-21 11:10:48,827 WARN L193 SmtUtils]: Spent 203.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 13 [2020-07-21 11:10:53,159 WARN L193 SmtUtils]: Spent 1.18 s on a formula simplification. DAG size of input: 56 DAG size of output: 11 [2020-07-21 11:10:56,443 WARN L193 SmtUtils]: Spent 332.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 13 [2020-07-21 11:11:01,722 WARN L193 SmtUtils]: Spent 2.57 s on a formula simplification. DAG size of input: 51 DAG size of output: 11 [2020-07-21 11:11:14,680 WARN L193 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 48 DAG size of output: 13 [2020-07-21 11:11:17,868 WARN L193 SmtUtils]: Spent 396.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 11 [2020-07-21 11:11:20,317 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 43 DAG size of output: 13 [2020-07-21 11:11:25,986 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 41 DAG size of output: 11 [2020-07-21 11:11:31,282 WARN L193 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 38 DAG size of output: 13 [2020-07-21 11:11:43,844 WARN L193 SmtUtils]: Spent 6.50 s on a formula simplification. DAG size of input: 36 DAG size of output: 11 [2020-07-21 11:11:51,538 WARN L193 SmtUtils]: Spent 2.16 s on a formula simplification. DAG size of input: 33 DAG size of output: 13 [2020-07-21 11:11:59,878 WARN L193 SmtUtils]: Spent 188.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 11 [2020-07-21 11:12:08,562 WARN L193 SmtUtils]: Spent 2.17 s on a formula simplification. DAG size of input: 26 DAG size of output: 11 [2020-07-21 11:12:26,580 WARN L193 SmtUtils]: Spent 2.16 s on a formula simplification. DAG size of input: 21 DAG size of output: 11 [2020-07-21 11:12:44,833 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:12:44,834 INFO L93 Difference]: Finished difference Result 114 states and 130 transitions. [2020-07-21 11:12:44,838 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2020-07-21 11:12:44,839 INFO L78 Accepts]: Start accepts. Automaton has 68 states. Word has length 103 [2020-07-21 11:12:44,840 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:12:44,844 INFO L225 Difference]: With dead ends: 114 [2020-07-21 11:12:44,844 INFO L226 Difference]: Without dead ends: 108 [2020-07-21 11:12:44,849 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 233 GetRequests, 139 SyntacticMatches, 0 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 699 ImplicationChecksByTransitivity, 194.3s TimeCoverageRelationStatistics Valid=1521, Invalid=7571, Unknown=28, NotChecked=0, Total=9120 [2020-07-21 11:12:44,850 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-07-21 11:12:44,866 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 108. [2020-07-21 11:12:44,866 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 108 states. [2020-07-21 11:12:44,869 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 109 transitions. [2020-07-21 11:12:44,869 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 109 transitions. Word has length 103 [2020-07-21 11:12:44,870 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:12:44,871 INFO L479 AbstractCegarLoop]: Abstraction has 108 states and 109 transitions. [2020-07-21 11:12:44,871 INFO L480 AbstractCegarLoop]: Interpolant automaton has 68 states. [2020-07-21 11:12:44,871 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 109 transitions. [2020-07-21 11:12:44,876 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 200 [2020-07-21 11:12:44,877 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:12:44,877 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 31, 31, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:12:45,090 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:12:45,092 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:12:45,092 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:12:45,093 INFO L82 PathProgramCache]: Analyzing trace with hash -935230737, now seen corresponding path program 5 times [2020-07-21 11:12:45,093 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:12:45,094 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [177881210] [2020-07-21 11:12:45,094 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:12:45,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:12:45,218 INFO L263 TraceCheckSpWp]: Trace formula consists of 402 conjuncts, 131 conjunts are in the unsatisfiable core [2020-07-21 11:12:45,228 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:12:49,337 INFO L134 CoverageAnalysis]: Checked inductivity of 2914 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 1457 trivial. 0 not checked. [2020-07-21 11:12:49,339 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:15:29,470 INFO L134 CoverageAnalysis]: Checked inductivity of 2914 backedges. 0 proven. 1398 refuted. 59 times theorem prover too weak. 1457 trivial. 0 not checked. [2020-07-21 11:15:29,472 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [177881210] [2020-07-21 11:15:29,472 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:15:29,472 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 67] total 132 [2020-07-21 11:15:29,473 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1316729698] [2020-07-21 11:15:29,475 INFO L459 AbstractCegarLoop]: Interpolant automaton has 132 states [2020-07-21 11:15:29,475 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:15:29,477 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 132 interpolants. [2020-07-21 11:15:29,483 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2248, Invalid=14985, Unknown=59, NotChecked=0, Total=17292 [2020-07-21 11:15:29,484 INFO L87 Difference]: Start difference. First operand 108 states and 109 transitions. Second operand 132 states. [2020-07-21 11:16:37,494 WARN L193 SmtUtils]: Spent 6.88 s on a formula simplification. DAG size of input: 158 DAG size of output: 13 [2020-07-21 11:17:32,892 WARN L193 SmtUtils]: Spent 7.42 s on a formula simplification. DAG size of input: 156 DAG size of output: 11 [2020-07-21 11:18:32,943 WARN L193 SmtUtils]: Spent 5.15 s on a formula simplification. DAG size of input: 153 DAG size of output: 13 [2020-07-21 11:19:33,523 WARN L193 SmtUtils]: Spent 4.27 s on a formula simplification. DAG size of input: 151 DAG size of output: 11 [2020-07-21 11:20:25,231 WARN L193 SmtUtils]: Spent 6.64 s on a formula simplification. DAG size of input: 148 DAG size of output: 13 [2020-07-21 11:21:17,704 WARN L193 SmtUtils]: Spent 2.72 s on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2020-07-21 11:22:13,904 WARN L193 SmtUtils]: Spent 3.38 s on a formula simplification. DAG size of input: 143 DAG size of output: 13 [2020-07-21 11:22:59,064 WARN L193 SmtUtils]: Spent 2.28 s on a formula simplification. DAG size of input: 141 DAG size of output: 11