/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/recHanoi03-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 10:41:52,938 INFO L177 SettingsManager]: Resetting all preferences to default values... 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[2020-07-21 10:41:52,955 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 10:41:52,956 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 10:41:52,958 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 10:41:52,960 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 10:41:52,962 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 10:41:52,963 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 10:41:52,964 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 10:41:52,965 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 10:41:52,966 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 10:41:52,967 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 10:41:52,968 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 10:41:52,970 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 10:41:52,971 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 10:41:52,972 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 10:41:52,975 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 10:41:52,980 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 10:41:52,982 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 10:41:52,984 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 10:41:52,989 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 10:41:52,990 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 10:41:52,992 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 10:41:53,012 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 10:41:53,013 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 10:41:53,016 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 10:41:53,017 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 10:41:53,045 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 10:41:53,045 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 10:41:53,047 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 10:41:53,047 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 10:41:53,048 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 10:41:53,048 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 10:41:53,048 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 10:41:53,048 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 10:41:53,048 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 10:41:53,049 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 10:41:53,050 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 10:41:53,050 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 10:41:53,050 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 10:41:53,051 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 10:41:53,051 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 10:41:53,051 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 10:41:53,051 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 10:41:53,052 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 10:41:53,052 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 10:41:53,052 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 10:41:53,052 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 10:41:53,052 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 10:41:53,053 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 10:41:53,053 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 10:41:53,053 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 10:41:53,053 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 10:41:53,053 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:41:53,054 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 10:41:53,054 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 10:41:53,054 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 10:41:53,425 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 10:41:53,439 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 10:41:53,443 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 10:41:53,445 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 10:41:53,446 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 10:41:53,446 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive/recHanoi03-2.c [2020-07-21 10:41:53,531 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b1fa510dc/b677ddff535a49cc84adad9bfe172a5d/FLAG6e6e48624 [2020-07-21 10:41:54,026 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 10:41:54,027 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive/recHanoi03-2.c [2020-07-21 10:41:54,034 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b1fa510dc/b677ddff535a49cc84adad9bfe172a5d/FLAG6e6e48624 [2020-07-21 10:41:54,385 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b1fa510dc/b677ddff535a49cc84adad9bfe172a5d [2020-07-21 10:41:54,395 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 10:41:54,398 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 10:41:54,399 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 10:41:54,400 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 10:41:54,404 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 10:41:54,406 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 10:41:54" (1/1) ... [2020-07-21 10:41:54,409 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6d0c3774 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:41:54, skipping insertion in model container [2020-07-21 10:41:54,410 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 10:41:54" (1/1) ... [2020-07-21 10:41:54,419 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 10:41:54,440 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 10:41:54,679 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 10:41:54,687 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 10:41:54,706 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 10:41:54,719 INFO L208 MainTranslator]: Completed translation [2020-07-21 10:41:54,719 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:41:54 WrapperNode [2020-07-21 10:41:54,719 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 10:41:54,720 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 10:41:54,720 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 10:41:54,720 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 10:41:54,732 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:41:54" (1/1) ... [2020-07-21 10:41:54,732 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:41:54" (1/1) ... [2020-07-21 10:41:54,737 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:41:54" (1/1) ... [2020-07-21 10:41:54,737 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:41:54" (1/1) ... [2020-07-21 10:41:54,741 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:41:54" (1/1) ... [2020-07-21 10:41:54,743 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:41:54" (1/1) ... [2020-07-21 10:41:54,744 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:41:54" (1/1) ... [2020-07-21 10:41:54,745 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 10:41:54,746 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 10:41:54,746 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 10:41:54,746 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 10:41:54,747 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:41:54" (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 10:41:54,900 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 10:41:54,900 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 10:41:54,901 INFO L138 BoogieDeclarations]: Found implementation of procedure hanoi [2020-07-21 10:41:54,901 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 10:41:54,901 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 10:41:54,901 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 10:41:54,901 INFO L130 BoogieDeclarations]: Found specification of procedure hanoi [2020-07-21 10:41:54,901 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 10:41:54,901 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 10:41:54,901 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 10:41:55,089 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 10:41:55,089 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 10:41:55,093 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 10:41:55 BoogieIcfgContainer [2020-07-21 10:41:55,094 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 10:41:55,095 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 10:41:55,095 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 10:41:55,098 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 10:41:55,099 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 10:41:54" (1/3) ... [2020-07-21 10:41:55,100 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@678f9c2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 10:41:55, skipping insertion in model container [2020-07-21 10:41:55,100 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:41:54" (2/3) ... [2020-07-21 10:41:55,100 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@678f9c2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 10:41:55, skipping insertion in model container [2020-07-21 10:41:55,101 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 10:41:55" (3/3) ... [2020-07-21 10:41:55,103 INFO L109 eAbstractionObserver]: Analyzing ICFG recHanoi03-2.c [2020-07-21 10:41:55,114 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 10:41:55,123 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 10:41:55,138 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 10:41:55,164 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 10:41:55,165 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 10:41:55,165 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 10:41:55,165 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 10:41:55,165 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 10:41:55,166 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 10:41:55,166 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 10:41:55,166 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 10:41:55,184 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2020-07-21 10:41:55,190 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-21 10:41:55,191 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:41:55,192 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:41:55,192 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:41:55,198 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:41:55,199 INFO L82 PathProgramCache]: Analyzing trace with hash 913793727, now seen corresponding path program 1 times [2020-07-21 10:41:55,206 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:41:55,206 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1194649564] [2020-07-21 10:41:55,207 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 10:41:55,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:41:55,262 INFO L263 TraceCheckSpWp]: Trace formula consists of 35 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-21 10:41:55,269 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:41:55,404 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 10:41:55,405 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 10:41:55,406 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1194649564] [2020-07-21 10:41:55,407 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 10:41:55,407 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-07-21 10:41:55,409 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1382109866] [2020-07-21 10:41:55,414 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-21 10:41:55,415 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:41:55,437 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-21 10:41:55,439 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-07-21 10:41:55,443 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 6 states. [2020-07-21 10:41:55,606 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:41:55,607 INFO L93 Difference]: Finished difference Result 33 states and 37 transitions. [2020-07-21 10:41:55,607 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 10:41:55,609 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 14 [2020-07-21 10:41:55,609 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:41:55,619 INFO L225 Difference]: With dead ends: 33 [2020-07-21 10:41:55,619 INFO L226 Difference]: Without dead ends: 19 [2020-07-21 10:41:55,623 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2020-07-21 10:41:55,643 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-07-21 10:41:55,669 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-07-21 10:41:55,671 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-07-21 10:41:55,673 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2020-07-21 10:41:55,675 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 14 [2020-07-21 10:41:55,676 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:41:55,676 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2020-07-21 10:41:55,676 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-21 10:41:55,676 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2020-07-21 10:41:55,679 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-21 10:41:55,679 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:41:55,679 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:41:55,893 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:41:55,893 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:41:55,894 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:41:55,894 INFO L82 PathProgramCache]: Analyzing trace with hash -1998834103, now seen corresponding path program 1 times [2020-07-21 10:41:55,894 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:41:55,895 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1660890969] [2020-07-21 10:41:55,895 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 10:41:55,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:41:55,939 INFO L263 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-21 10:41:55,942 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:41:56,152 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 10:41:56,153 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:41:56,510 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:41:56,514 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:42:23,710 WARN L193 SmtUtils]: Spent 9.54 s on a formula simplification that was a NOOP. DAG size: 19 [2020-07-21 10:42:39,616 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:42:41,240 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 10:42:41,241 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1660890969] [2020-07-21 10:42:41,241 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:42:41,241 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 15 [2020-07-21 10:42:41,242 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [998778005] [2020-07-21 10:42:41,243 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 10:42:41,244 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:42:41,244 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 10:42:41,245 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=162, Unknown=9, NotChecked=0, Total=210 [2020-07-21 10:42:41,245 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand 15 states. [2020-07-21 10:42:48,971 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:42:48,971 INFO L93 Difference]: Finished difference Result 31 states and 33 transitions. [2020-07-21 10:42:48,973 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 10:42:48,974 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 20 [2020-07-21 10:42:48,974 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:42:48,975 INFO L225 Difference]: With dead ends: 31 [2020-07-21 10:42:48,975 INFO L226 Difference]: Without dead ends: 25 [2020-07-21 10:42:48,977 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 23 SyntacticMatches, 3 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 52.3s TimeCoverageRelationStatistics Valid=76, Invalid=292, Unknown=12, NotChecked=0, Total=380 [2020-07-21 10:42:48,977 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-07-21 10:42:48,984 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-07-21 10:42:48,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-07-21 10:42:48,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 26 transitions. [2020-07-21 10:42:48,986 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 26 transitions. Word has length 20 [2020-07-21 10:42:48,986 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:42:48,986 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 26 transitions. [2020-07-21 10:42:48,986 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 10:42:48,987 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 26 transitions. [2020-07-21 10:42:48,988 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-07-21 10:42:48,988 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:42:48,988 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:42:49,203 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:42:49,204 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:42:49,204 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:42:49,204 INFO L82 PathProgramCache]: Analyzing trace with hash -547108535, now seen corresponding path program 2 times [2020-07-21 10:42:49,205 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:42:49,206 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [351980830] [2020-07-21 10:42:49,206 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 10:42:49,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:42:49,242 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-21 10:42:49,244 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:42:50,289 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 10:42:50,289 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:42:52,029 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [351980830] [2020-07-21 10:42:52,030 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 10:42:52,030 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-07-21 10:42:52,030 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1433320796] [2020-07-21 10:42:52,031 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 10:42:52,032 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:42:52,032 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 10:42:52,032 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=224, Unknown=0, NotChecked=0, Total=272 [2020-07-21 10:42:52,032 INFO L87 Difference]: Start difference. First operand 25 states and 26 transitions. Second operand 12 states. [2020-07-21 10:42:53,410 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:42:53,410 INFO L93 Difference]: Finished difference Result 32 states and 33 transitions. [2020-07-21 10:42:53,413 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 10:42:53,413 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 32 [2020-07-21 10:42:53,414 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:42:53,415 INFO L225 Difference]: With dead ends: 32 [2020-07-21 10:42:53,416 INFO L226 Difference]: Without dead ends: 28 [2020-07-21 10:42:53,417 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=90, Invalid=462, Unknown=0, NotChecked=0, Total=552 [2020-07-21 10:42:53,417 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-21 10:42:53,421 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-07-21 10:42:53,422 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-07-21 10:42:53,423 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 29 transitions. [2020-07-21 10:42:53,423 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 29 transitions. Word has length 32 [2020-07-21 10:42:53,424 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:42:53,424 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 29 transitions. [2020-07-21 10:42:53,424 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 10:42:53,424 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 29 transitions. [2020-07-21 10:42:53,425 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-07-21 10:42:53,425 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:42:53,425 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:42:53,626 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:42:53,627 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:42:53,627 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:42:53,628 INFO L82 PathProgramCache]: Analyzing trace with hash -1152432193, now seen corresponding path program 3 times [2020-07-21 10:42:53,628 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:42:53,629 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [637889570] [2020-07-21 10:42:53,629 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 10:42:53,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:42:53,666 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 23 conjunts are in the unsatisfiable core [2020-07-21 10:42:53,669 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:43:16,841 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2020-07-21 10:43:16,841 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:43:18,036 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-21 10:43:18,149 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-21 10:43:19,232 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [637889570] [2020-07-21 10:43:19,232 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 10:43:19,233 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-07-21 10:43:19,233 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2129036650] [2020-07-21 10:43:19,234 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 10:43:19,234 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:43:19,235 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 10:43:19,235 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=275, Unknown=11, NotChecked=0, Total=342 [2020-07-21 10:43:19,235 INFO L87 Difference]: Start difference. First operand 28 states and 29 transitions. Second operand 14 states. [2020-07-21 10:44:17,291 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:44:17,291 INFO L93 Difference]: Finished difference Result 35 states and 36 transitions. [2020-07-21 10:44:17,296 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 10:44:17,297 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 38 [2020-07-21 10:44:17,297 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:44:17,298 INFO L225 Difference]: With dead ends: 35 [2020-07-21 10:44:17,298 INFO L226 Difference]: Without dead ends: 31 [2020-07-21 10:44:17,299 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 53.1s TimeCoverageRelationStatistics Valid=110, Invalid=626, Unknown=20, NotChecked=0, Total=756 [2020-07-21 10:44:17,300 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-07-21 10:44:17,305 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2020-07-21 10:44:17,306 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-21 10:44:17,307 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 32 transitions. [2020-07-21 10:44:17,307 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 32 transitions. Word has length 38 [2020-07-21 10:44:17,307 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:44:17,307 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 32 transitions. [2020-07-21 10:44:17,308 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 10:44:17,308 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 32 transitions. [2020-07-21 10:44:17,309 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-07-21 10:44:17,309 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:44:17,309 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:44:17,513 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:44:17,513 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:44:17,514 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:44:17,514 INFO L82 PathProgramCache]: Analyzing trace with hash 1461718089, now seen corresponding path program 4 times [2020-07-21 10:44:17,515 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:44:17,517 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1661370195] [2020-07-21 10:44:17,517 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 10:44:17,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:44:17,568 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 27 conjunts are in the unsatisfiable core [2020-07-21 10:44:17,573 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:45:20,017 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-07-21 10:45:20,018 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:45:21,185 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 10:45:21,300 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 10:45:21,437 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-21 10:45:21,566 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-21 10:45:21,707 WARN L193 SmtUtils]: Spent 137.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2020-07-21 10:45:21,846 WARN L193 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2020-07-21 10:45:22,016 WARN L193 SmtUtils]: Spent 165.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-21 10:45:22,181 WARN L193 SmtUtils]: Spent 161.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-21 10:45:22,358 WARN L193 SmtUtils]: Spent 170.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-21 10:45:22,539 WARN L193 SmtUtils]: Spent 178.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-21 10:45:22,757 WARN L193 SmtUtils]: Spent 213.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-21 10:45:22,966 WARN L193 SmtUtils]: Spent 206.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-21 10:45:23,952 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-21 10:45:24,056 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-21 10:45:24,190 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 10:45:24,312 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 10:45:24,444 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-21 10:45:24,580 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-21 10:45:24,736 WARN L193 SmtUtils]: Spent 149.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2020-07-21 10:45:24,887 WARN L193 SmtUtils]: Spent 147.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2020-07-21 10:45:25,053 WARN L193 SmtUtils]: Spent 161.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-21 10:45:25,216 WARN L193 SmtUtils]: Spent 159.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-21 10:45:25,332 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-21 10:45:25,597 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1661370195] [2020-07-21 10:45:25,597 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 10:45:25,598 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-07-21 10:45:25,598 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1628027743] [2020-07-21 10:45:25,605 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 10:45:25,606 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:45:25,606 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 10:45:25,607 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=327, Unknown=29, NotChecked=0, Total=420 [2020-07-21 10:45:25,607 INFO L87 Difference]: Start difference. First operand 31 states and 32 transitions. Second operand 16 states. [2020-07-21 10:48:21,682 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:48:21,683 INFO L93 Difference]: Finished difference Result 38 states and 39 transitions. [2020-07-21 10:48:21,692 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-21 10:48:21,692 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 44 [2020-07-21 10:48:21,693 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:48:21,694 INFO L225 Difference]: With dead ends: 38 [2020-07-21 10:48:21,694 INFO L226 Difference]: Without dead ends: 34 [2020-07-21 10:48:21,696 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 79 ImplicationChecksByTransitivity, 158.2s TimeCoverageRelationStatistics Valid=130, Invalid=806, Unknown=56, NotChecked=0, Total=992 [2020-07-21 10:48:21,696 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-07-21 10:48:21,701 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-07-21 10:48:21,701 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-07-21 10:48:21,702 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 35 transitions. [2020-07-21 10:48:21,702 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 35 transitions. Word has length 44 [2020-07-21 10:48:21,703 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:48:21,703 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 35 transitions. [2020-07-21 10:48:21,703 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 10:48:21,703 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 35 transitions. [2020-07-21 10:48:21,705 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-07-21 10:48:21,705 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:48:21,705 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:48:21,907 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:48:21,908 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:48:21,908 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:48:21,909 INFO L82 PathProgramCache]: Analyzing trace with hash -269168065, now seen corresponding path program 5 times [2020-07-21 10:48:21,909 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:48:21,910 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1074463144] [2020-07-21 10:48:21,910 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 10:48:21,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:48:21,975 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 31 conjunts are in the unsatisfiable core [2020-07-21 10:48:21,978 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:50:22,855 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 10:50:22,910 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2020-07-21 10:50:22,910 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:50:23,818 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 25 [2020-07-21 10:50:23,931 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 25 [2020-07-21 10:50:24,080 WARN L193 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 31 [2020-07-21 10:50:24,224 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 31 [2020-07-21 10:50:24,400 WARN L193 SmtUtils]: Spent 171.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-21 10:50:24,565 WARN L193 SmtUtils]: Spent 161.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-21 10:50:24,752 WARN L193 SmtUtils]: Spent 182.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 10:50:24,949 WARN L193 SmtUtils]: Spent 192.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 10:50:25,165 WARN L193 SmtUtils]: Spent 209.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-21 10:50:25,381 WARN L193 SmtUtils]: Spent 212.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-21 10:50:25,620 WARN L193 SmtUtils]: Spent 231.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2020-07-21 10:50:25,844 WARN L193 SmtUtils]: Spent 220.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2020-07-21 10:50:26,109 WARN L193 SmtUtils]: Spent 258.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-21 10:50:26,379 WARN L193 SmtUtils]: Spent 266.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-21 10:50:26,676 WARN L193 SmtUtils]: Spent 291.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-21 10:50:26,968 WARN L193 SmtUtils]: Spent 288.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-21 10:50:27,262 WARN L193 SmtUtils]: Spent 288.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2020-07-21 10:50:27,579 WARN L193 SmtUtils]: Spent 313.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2020-07-21 10:50:27,966 WARN L193 SmtUtils]: Spent 380.00 ms on a formula simplification that was a NOOP. DAG size: 75 [2020-07-21 10:50:28,338 WARN L193 SmtUtils]: Spent 367.00 ms on a formula simplification that was a NOOP. DAG size: 75 [2020-07-21 10:50:28,714 WARN L193 SmtUtils]: Spent 369.00 ms on a formula simplification that was a NOOP. DAG size: 79 [2020-07-21 10:50:29,074 WARN L193 SmtUtils]: Spent 356.00 ms on a formula simplification that was a NOOP. DAG size: 79 [2020-07-21 10:50:30,049 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 25 [2020-07-21 10:50:30,161 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 25 [2020-07-21 10:50:30,293 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 31 [2020-07-21 10:50:30,420 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 31 [2020-07-21 10:50:30,582 WARN L193 SmtUtils]: Spent 157.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-21 10:50:30,742 WARN L193 SmtUtils]: Spent 156.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-21 10:50:30,921 WARN L193 SmtUtils]: Spent 175.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 10:50:31,108 WARN L193 SmtUtils]: Spent 180.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 10:50:31,319 WARN L193 SmtUtils]: Spent 206.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-21 10:50:31,537 WARN L193 SmtUtils]: Spent 214.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-21 10:50:31,777 WARN L193 SmtUtils]: Spent 234.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2020-07-21 10:50:32,015 WARN L193 SmtUtils]: Spent 233.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2020-07-21 10:50:32,279 WARN L193 SmtUtils]: Spent 259.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-21 10:50:32,544 WARN L193 SmtUtils]: Spent 259.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-21 10:50:32,833 WARN L193 SmtUtils]: Spent 284.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-21 10:50:33,127 WARN L193 SmtUtils]: Spent 290.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-21 10:50:33,445 WARN L193 SmtUtils]: Spent 313.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2020-07-21 10:50:33,775 WARN L193 SmtUtils]: Spent 326.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2020-07-21 10:50:33,984 WARN L193 SmtUtils]: Spent 200.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-21 10:50:34,239 WARN L193 SmtUtils]: Spent 249.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-21 10:50:34,448 WARN L193 SmtUtils]: Spent 204.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-21 10:50:34,635 WARN L193 SmtUtils]: Spent 181.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-07-21 10:50:34,800 WARN L193 SmtUtils]: Spent 160.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 10:50:34,950 WARN L193 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-21 10:50:35,318 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1074463144] [2020-07-21 10:50:35,318 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 10:50:35,319 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-07-21 10:50:35,319 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2133774407] [2020-07-21 10:50:35,319 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 10:50:35,319 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:50:35,320 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 10:50:35,320 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=385, Unknown=49, NotChecked=0, Total=506 [2020-07-21 10:50:35,320 INFO L87 Difference]: Start difference. First operand 34 states and 35 transitions. Second operand 18 states.