java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf --abstractinterpretationv2.abstract.domain IntervalDomain --traceabstraction.trace.refinement.strategy TAIPAN --traceabstraction.abstract.interpretation.mode USE_PREDICATES -i ../../../trunk/examples/svcomp/eca-rers2012/Problem12_label20.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-13a467a-m [2019-10-15 00:04:38,724 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-15 00:04:38,727 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-15 00:04:38,743 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-10-15 00:04:38,744 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-10-15 00:04:38,745 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-10-15 00:04:38,746 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-10-15 00:04:38,748 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-10-15 00:04:38,749 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-10-15 00:04:38,750 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-10-15 00:04:38,751 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-10-15 00:04:38,752 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-10-15 00:04:38,752 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-15 00:04:38,753 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-15 00:04:38,754 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-15 00:04:38,755 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-15 00:04:38,756 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-15 00:04:38,757 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-15 00:04:38,759 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-15 00:04:38,761 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-15 00:04:38,762 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-15 00:04:38,763 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-15 00:04:38,764 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-15 00:04:38,765 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-15 00:04:38,767 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-10-15 00:04:38,776 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-15 00:04:38,777 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-15 00:04:38,777 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-15 00:04:38,778 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2019-10-15 00:04:38,792 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-15 00:04:38,793 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-15 00:04:38,794 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-15 00:04:38,794 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-15 00:04:38,794 INFO L138 SettingsManager]: * Use SBE=true [2019-10-15 00:04:38,794 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-15 00:04:38,795 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-15 00:04:38,795 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-15 00:04:38,795 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-15 00:04:38,795 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-15 00:04:38,795 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-15 00:04:38,796 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-15 00:04:38,796 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-15 00:04:38,796 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-15 00:04:38,796 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-15 00:04:38,796 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-15 00:04:38,796 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-15 00:04:38,797 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-15 00:04:38,797 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-15 00:04:38,797 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-15 00:04:38,797 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-15 00:04:38,797 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-15 00:04:38,798 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-15 00:04:38,798 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-15 00:04:38,798 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-15 00:04:38,798 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-15 00:04:38,798 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-15 00:04:38,799 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-15 00:04:38,799 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.analysis.abstractinterpretationv2: Abstract domain -> IntervalDomain Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> TAIPAN Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Abstract interpretation Mode -> USE_PREDICATES [2019-10-15 00:04:39,078 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-15 00:04:39,090 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-15 00:04:39,094 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-15 00:04:39,095 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-15 00:04:39,096 INFO L275 PluginConnector]: CDTParser initialized [2019-10-15 00:04:39,096 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/eca-rers2012/Problem12_label20.c [2019-10-15 00:04:39,173 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3c587a48c/95e7e76765204986a7b5754666492323/FLAGd938a7821 [2019-10-15 00:04:39,900 INFO L306 CDTParser]: Found 1 translation units. [2019-10-15 00:04:39,902 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/eca-rers2012/Problem12_label20.c [2019-10-15 00:04:39,932 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3c587a48c/95e7e76765204986a7b5754666492323/FLAGd938a7821 [2019-10-15 00:04:39,999 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3c587a48c/95e7e76765204986a7b5754666492323 [2019-10-15 00:04:40,009 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-15 00:04:40,012 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-15 00:04:40,015 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-15 00:04:40,015 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-15 00:04:40,019 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-15 00:04:40,020 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 12:04:40" (1/1) ... [2019-10-15 00:04:40,023 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@32ed2b26 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 12:04:40, skipping insertion in model container [2019-10-15 00:04:40,023 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 12:04:40" (1/1) ... [2019-10-15 00:04:40,031 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-15 00:04:40,176 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-15 00:04:41,630 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-15 00:04:41,636 INFO L188 MainTranslator]: Completed pre-run [2019-10-15 00:04:42,277 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-15 00:04:42,316 INFO L192 MainTranslator]: Completed translation [2019-10-15 00:04:42,317 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 12:04:42 WrapperNode [2019-10-15 00:04:42,317 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-15 00:04:42,318 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-15 00:04:42,318 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-15 00:04:42,318 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-15 00:04:42,338 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 12:04:42" (1/1) ... [2019-10-15 00:04:42,338 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 12:04:42" (1/1) ... [2019-10-15 00:04:42,408 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 12:04:42" (1/1) ... [2019-10-15 00:04:42,411 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 12:04:42" (1/1) ... [2019-10-15 00:04:42,561 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 12:04:42" (1/1) ... [2019-10-15 00:04:42,597 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 12:04:42" (1/1) ... [2019-10-15 00:04:42,636 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 12:04:42" (1/1) ... [2019-10-15 00:04:42,679 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-15 00:04:42,680 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-15 00:04:42,680 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-15 00:04:42,680 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-15 00:04:42,681 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 12:04:42" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-15 00:04:42,744 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-15 00:04:42,744 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-15 00:04:42,744 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output [2019-10-15 00:04:42,744 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output2 [2019-10-15 00:04:42,744 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output3 [2019-10-15 00:04:42,745 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output4 [2019-10-15 00:04:42,745 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-15 00:04:42,745 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output [2019-10-15 00:04:42,745 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output2 [2019-10-15 00:04:42,746 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output3 [2019-10-15 00:04:42,746 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output4 [2019-10-15 00:04:42,746 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-15 00:04:42,747 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-10-15 00:04:42,747 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2019-10-15 00:04:42,748 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-15 00:04:42,748 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-15 00:04:42,749 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-15 00:04:47,414 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-15 00:04:47,417 INFO L284 CfgBuilder]: Removed 1 assume(true) statements. [2019-10-15 00:04:47,419 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 12:04:47 BoogieIcfgContainer [2019-10-15 00:04:47,419 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-15 00:04:47,421 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-15 00:04:47,421 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-15 00:04:47,424 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-15 00:04:47,425 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 15.10 12:04:40" (1/3) ... [2019-10-15 00:04:47,425 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@35511577 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 12:04:47, skipping insertion in model container [2019-10-15 00:04:47,425 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 12:04:42" (2/3) ... [2019-10-15 00:04:47,426 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@35511577 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 12:04:47, skipping insertion in model container [2019-10-15 00:04:47,427 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 12:04:47" (3/3) ... [2019-10-15 00:04:47,436 INFO L109 eAbstractionObserver]: Analyzing ICFG Problem12_label20.c [2019-10-15 00:04:47,446 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-15 00:04:47,455 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-15 00:04:47,465 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-15 00:04:47,504 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-15 00:04:47,504 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-15 00:04:47,504 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-15 00:04:47,504 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-15 00:04:47,504 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-15 00:04:47,504 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-15 00:04:47,505 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-15 00:04:47,505 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-15 00:04:47,546 INFO L276 IsEmpty]: Start isEmpty. Operand 839 states. [2019-10-15 00:04:47,552 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2019-10-15 00:04:47,552 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 00:04:47,553 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 00:04:47,555 INFO L410 AbstractCegarLoop]: === Iteration 1 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 00:04:47,560 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 00:04:47,560 INFO L82 PathProgramCache]: Analyzing trace with hash 326484869, now seen corresponding path program 1 times [2019-10-15 00:04:47,567 INFO L157 tionRefinementEngine]: Executing refinement strategy TAIPAN [2019-10-15 00:04:47,567 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [240514349] [2019-10-15 00:04:47,567 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 00:04:47,568 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 00:04:47,568 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 00:04:47,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 00:04:47,879 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 00:04:47,879 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [240514349] [2019-10-15 00:04:47,880 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 00:04:47,881 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-10-15 00:04:47,881 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1341820377] [2019-10-15 00:04:47,886 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-15 00:04:47,888 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-10-15 00:04:47,902 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-15 00:04:47,904 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-15 00:04:47,906 INFO L87 Difference]: Start difference. First operand 839 states. Second operand 3 states. [2019-10-15 00:04:52,688 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 00:04:52,688 INFO L93 Difference]: Finished difference Result 2443 states and 4697 transitions. [2019-10-15 00:04:52,689 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-15 00:04:52,691 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 18 [2019-10-15 00:04:52,691 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 00:04:52,722 INFO L225 Difference]: With dead ends: 2443 [2019-10-15 00:04:52,722 INFO L226 Difference]: Without dead ends: 1542 [2019-10-15 00:04:52,732 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-15 00:04:52,752 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1542 states. [2019-10-15 00:04:52,863 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1542 to 1542. [2019-10-15 00:04:52,864 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1542 states. [2019-10-15 00:04:52,874 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1542 states to 1542 states and 2822 transitions. [2019-10-15 00:04:52,876 INFO L78 Accepts]: Start accepts. Automaton has 1542 states and 2822 transitions. Word has length 18 [2019-10-15 00:04:52,876 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 00:04:52,877 INFO L462 AbstractCegarLoop]: Abstraction has 1542 states and 2822 transitions. [2019-10-15 00:04:52,887 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-15 00:04:52,887 INFO L276 IsEmpty]: Start isEmpty. Operand 1542 states and 2822 transitions. [2019-10-15 00:04:52,894 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2019-10-15 00:04:52,894 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 00:04:52,894 INFO L380 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 00:04:52,894 INFO L410 AbstractCegarLoop]: === Iteration 2 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 00:04:52,895 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 00:04:52,895 INFO L82 PathProgramCache]: Analyzing trace with hash -1701778415, now seen corresponding path program 1 times [2019-10-15 00:04:52,895 INFO L157 tionRefinementEngine]: Executing refinement strategy TAIPAN [2019-10-15 00:04:52,895 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [153236557] [2019-10-15 00:04:52,896 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 00:04:52,896 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 00:04:52,896 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 00:04:52,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 00:04:53,125 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 00:04:53,125 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [153236557] [2019-10-15 00:04:53,126 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 00:04:53,126 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-10-15 00:04:53,126 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [553833510] [2019-10-15 00:04:53,128 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-10-15 00:04:53,129 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-10-15 00:04:53,129 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-10-15 00:04:53,130 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2019-10-15 00:04:53,130 INFO L87 Difference]: Start difference. First operand 1542 states and 2822 transitions. Second operand 5 states. [2019-10-15 00:04:59,513 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 00:04:59,513 INFO L93 Difference]: Finished difference Result 3912 states and 7104 transitions. [2019-10-15 00:04:59,514 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-10-15 00:04:59,514 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 91 [2019-10-15 00:04:59,515 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 00:04:59,530 INFO L225 Difference]: With dead ends: 3912 [2019-10-15 00:04:59,530 INFO L226 Difference]: Without dead ends: 2376 [2019-10-15 00:04:59,535 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2019-10-15 00:04:59,538 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2376 states. [2019-10-15 00:04:59,603 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2376 to 2350. [2019-10-15 00:04:59,603 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2350 states. [2019-10-15 00:04:59,611 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2350 states to 2350 states and 3968 transitions. [2019-10-15 00:04:59,611 INFO L78 Accepts]: Start accepts. Automaton has 2350 states and 3968 transitions. Word has length 91 [2019-10-15 00:04:59,612 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 00:04:59,612 INFO L462 AbstractCegarLoop]: Abstraction has 2350 states and 3968 transitions. [2019-10-15 00:04:59,613 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-10-15 00:04:59,613 INFO L276 IsEmpty]: Start isEmpty. Operand 2350 states and 3968 transitions. [2019-10-15 00:04:59,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2019-10-15 00:04:59,619 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 00:04:59,619 INFO L380 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 00:04:59,620 INFO L410 AbstractCegarLoop]: === Iteration 3 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 00:04:59,621 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 00:04:59,621 INFO L82 PathProgramCache]: Analyzing trace with hash 2024884205, now seen corresponding path program 1 times [2019-10-15 00:04:59,621 INFO L157 tionRefinementEngine]: Executing refinement strategy TAIPAN [2019-10-15 00:04:59,621 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [96722445] [2019-10-15 00:04:59,622 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 00:04:59,622 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 00:04:59,623 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 00:04:59,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 00:04:59,824 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-10-15 00:04:59,825 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [96722445] [2019-10-15 00:04:59,825 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1979173680] [2019-10-15 00:04:59,825 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 00:04:59,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 00:04:59,913 INFO L256 TraceCheckSpWp]: Trace formula consists of 258 conjuncts, 8 conjunts are in the unsatisfiable core [2019-10-15 00:04:59,922 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 00:04:59,992 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-10-15 00:04:59,992 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 00:05:00,109 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-10-15 00:05:00,110 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2019-10-15 00:05:00,110 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [5, 4] total 7 [2019-10-15 00:05:00,111 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1306435276] [2019-10-15 00:05:00,111 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-15 00:05:00,112 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-10-15 00:05:00,112 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-15 00:05:00,112 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-10-15 00:05:00,113 INFO L87 Difference]: Start difference. First operand 2350 states and 3968 transitions. Second operand 4 states. [2019-10-15 00:05:05,301 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 00:05:05,301 INFO L93 Difference]: Finished difference Result 7080 states and 12087 transitions. [2019-10-15 00:05:05,304 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-15 00:05:05,304 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 93 [2019-10-15 00:05:05,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 00:05:05,339 INFO L225 Difference]: With dead ends: 7080 [2019-10-15 00:05:05,339 INFO L226 Difference]: Without dead ends: 4736 [2019-10-15 00:05:05,347 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 193 GetRequests, 185 SyntacticMatches, 3 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-10-15 00:05:05,352 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4736 states. [2019-10-15 00:05:05,479 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4736 to 4736. [2019-10-15 00:05:05,479 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4736 states. [2019-10-15 00:05:05,555 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4736 states to 4736 states and 7803 transitions. [2019-10-15 00:05:05,556 INFO L78 Accepts]: Start accepts. Automaton has 4736 states and 7803 transitions. Word has length 93 [2019-10-15 00:05:05,557 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 00:05:05,557 INFO L462 AbstractCegarLoop]: Abstraction has 4736 states and 7803 transitions. [2019-10-15 00:05:05,557 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-15 00:05:05,557 INFO L276 IsEmpty]: Start isEmpty. Operand 4736 states and 7803 transitions. [2019-10-15 00:05:05,567 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 183 [2019-10-15 00:05:05,567 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 00:05:05,567 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 00:05:05,774 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 00:05:05,777 INFO L410 AbstractCegarLoop]: === Iteration 4 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 00:05:05,777 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 00:05:05,778 INFO L82 PathProgramCache]: Analyzing trace with hash -1171285559, now seen corresponding path program 1 times [2019-10-15 00:05:05,778 INFO L157 tionRefinementEngine]: Executing refinement strategy TAIPAN [2019-10-15 00:05:05,778 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [340341726] [2019-10-15 00:05:05,778 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 00:05:05,778 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 00:05:05,779 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 00:05:05,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 00:05:05,987 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 22 proven. 69 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-15 00:05:05,988 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [340341726] [2019-10-15 00:05:05,988 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [239883646] [2019-10-15 00:05:05,988 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 00:05:06,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 00:05:06,087 INFO L256 TraceCheckSpWp]: Trace formula consists of 397 conjuncts, 6 conjunts are in the unsatisfiable core [2019-10-15 00:05:06,093 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 00:05:06,168 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 83 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2019-10-15 00:05:06,169 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 00:05:06,315 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 22 proven. 69 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-15 00:05:06,316 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2019-10-15 00:05:06,316 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6, 5] total 12 [2019-10-15 00:05:06,317 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1194220106] [2019-10-15 00:05:06,319 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-10-15 00:05:06,319 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-10-15 00:05:06,319 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-10-15 00:05:06,320 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2019-10-15 00:05:06,321 INFO L87 Difference]: Start difference. First operand 4736 states and 7803 transitions. Second operand 5 states. [2019-10-15 00:05:12,830 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 00:05:12,831 INFO L93 Difference]: Finished difference Result 12030 states and 19990 transitions. [2019-10-15 00:05:12,831 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-10-15 00:05:12,831 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 182 [2019-10-15 00:05:12,834 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 00:05:12,866 INFO L225 Difference]: With dead ends: 12030 [2019-10-15 00:05:12,867 INFO L226 Difference]: Without dead ends: 7300 [2019-10-15 00:05:12,878 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 371 GetRequests, 360 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=38, Invalid=118, Unknown=0, NotChecked=0, Total=156 [2019-10-15 00:05:12,885 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7300 states. [2019-10-15 00:05:13,035 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7300 to 7158. [2019-10-15 00:05:13,035 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7158 states. [2019-10-15 00:05:13,051 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7158 states to 7158 states and 10991 transitions. [2019-10-15 00:05:13,051 INFO L78 Accepts]: Start accepts. Automaton has 7158 states and 10991 transitions. Word has length 182 [2019-10-15 00:05:13,052 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 00:05:13,052 INFO L462 AbstractCegarLoop]: Abstraction has 7158 states and 10991 transitions. [2019-10-15 00:05:13,053 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-10-15 00:05:13,053 INFO L276 IsEmpty]: Start isEmpty. Operand 7158 states and 10991 transitions. [2019-10-15 00:05:13,058 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 194 [2019-10-15 00:05:13,058 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 00:05:13,059 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 00:05:13,264 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 00:05:13,265 INFO L410 AbstractCegarLoop]: === Iteration 5 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 00:05:13,265 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 00:05:13,266 INFO L82 PathProgramCache]: Analyzing trace with hash 916550728, now seen corresponding path program 1 times [2019-10-15 00:05:13,266 INFO L157 tionRefinementEngine]: Executing refinement strategy TAIPAN [2019-10-15 00:05:13,266 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2117677775] [2019-10-15 00:05:13,266 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 00:05:13,267 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 00:05:13,267 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 00:05:13,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 00:05:13,440 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 22 proven. 77 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-15 00:05:13,441 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2117677775] [2019-10-15 00:05:13,441 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1791315598] [2019-10-15 00:05:13,441 INFO L94 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 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 00:05:13,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 00:05:13,528 INFO L256 TraceCheckSpWp]: Trace formula consists of 407 conjuncts, 6 conjunts are in the unsatisfiable core [2019-10-15 00:05:13,541 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 00:05:13,610 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 91 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2019-10-15 00:05:13,611 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 00:05:13,710 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 22 proven. 77 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-15 00:05:13,710 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2019-10-15 00:05:13,710 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [5, 5] total 10 [2019-10-15 00:05:13,711 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2099573386] [2019-10-15 00:05:13,711 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-10-15 00:05:13,711 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-10-15 00:05:13,712 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-10-15 00:05:13,712 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2019-10-15 00:05:13,712 INFO L87 Difference]: Start difference. First operand 7158 states and 10991 transitions. Second operand 5 states.