/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf --abstractinterpretationv2.abstract.domain IntervalDomain --traceabstraction.trace.refinement.strategy TAIPAN --traceabstraction.abstract.interpretation.mode USE_PREDICATES -i ../../../trunk/examples/svcomp/eca-rers2012/Problem15_label23.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-fb55353 [2019-11-06 22:52:34,263 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-06 22:52:34,266 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-06 22:52:34,278 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2019-11-06 22:52:34,297 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-06 22:52:34,299 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-06 22:52:34,301 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-06 22:52:34,304 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-06 22:52:34,306 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-06 22:52:34,309 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-06 22:52:34,310 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-06 22:52:34,316 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-06 22:52:34,320 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-06 22:52:34,322 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-06 22:52:34,324 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-06 22:52:34,325 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-06 22:52:34,327 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-11-06 22:52:34,339 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-06 22:52:34,339 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-06 22:52:34,340 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-06 22:52:34,341 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 [2019-11-06 22:52:34,356 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-06 22:52:34,356 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-06 22:52:34,357 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-06 22:52:34,358 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-06 22:52:34,358 INFO L138 SettingsManager]: * Use SBE=true [2019-11-06 22:52:34,358 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-06 22:52:34,358 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-06 22:52:34,359 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-06 22:52:34,359 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-06 22:52:34,359 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-06 22:52:34,359 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-06 22:52:34,359 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-06 22:52:34,359 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-06 22:52:34,360 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-06 22:52:34,360 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-06 22:52:34,360 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-06 22:52:34,360 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-06 22:52:34,360 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-06 22:52:34,361 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-06 22:52:34,361 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-06 22:52:34,361 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-06 22:52:34,361 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-06 22:52:34,361 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-06 22:52:34,362 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-06 22:52:34,362 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-06 22:52:34,362 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-06 22:52:34,362 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-06 22:52:34,362 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-06 22:52:34,363 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 [2019-11-06 22:52:34,652 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-06 22:52:34,674 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-06 22:52:34,678 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-06 22:52:34,679 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-06 22:52:34,680 INFO L275 PluginConnector]: CDTParser initialized [2019-11-06 22:52:34,681 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/eca-rers2012/Problem15_label23.c [2019-11-06 22:52:34,759 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3aa005247/684d5ed579b845968167b05749c8c98b/FLAG74d414d97 [2019-11-06 22:52:35,447 INFO L306 CDTParser]: Found 1 translation units. [2019-11-06 22:52:35,448 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/eca-rers2012/Problem15_label23.c [2019-11-06 22:52:35,465 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3aa005247/684d5ed579b845968167b05749c8c98b/FLAG74d414d97 [2019-11-06 22:52:35,629 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3aa005247/684d5ed579b845968167b05749c8c98b [2019-11-06 22:52:35,637 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-06 22:52:35,639 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-11-06 22:52:35,640 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-06 22:52:35,640 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-06 22:52:35,643 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-06 22:52:35,644 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 10:52:35" (1/1) ... [2019-11-06 22:52:35,647 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@254af1c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:52:35, skipping insertion in model container [2019-11-06 22:52:35,648 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 10:52:35" (1/1) ... [2019-11-06 22:52:35,655 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-11-06 22:52:35,746 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-11-06 22:52:36,636 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-06 22:52:36,651 INFO L188 MainTranslator]: Completed pre-run [2019-11-06 22:52:36,938 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-06 22:52:36,961 INFO L192 MainTranslator]: Completed translation [2019-11-06 22:52:36,962 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:52:36 WrapperNode [2019-11-06 22:52:36,962 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-06 22:52:36,963 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-06 22:52:36,963 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-06 22:52:36,963 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-06 22:52:36,981 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:52:36" (1/1) ... [2019-11-06 22:52:36,982 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:52:36" (1/1) ... [2019-11-06 22:52:37,025 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:52:36" (1/1) ... [2019-11-06 22:52:37,026 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:52:36" (1/1) ... [2019-11-06 22:52:37,098 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:52:36" (1/1) ... [2019-11-06 22:52:37,128 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:52:36" (1/1) ... [2019-11-06 22:52:37,150 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:52:36" (1/1) ... [2019-11-06 22:52:37,171 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-06 22:52:37,171 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-06 22:52:37,171 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-06 22:52:37,172 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-06 22:52:37,173 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:52:36" (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 [2019-11-06 22:52:37,238 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-11-06 22:52:37,238 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-06 22:52:37,239 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output [2019-11-06 22:52:37,239 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output2 [2019-11-06 22:52:37,239 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-11-06 22:52:37,239 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output [2019-11-06 22:52:37,239 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output2 [2019-11-06 22:52:37,240 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-11-06 22:52:37,240 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-11-06 22:52:37,240 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2019-11-06 22:52:37,240 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-11-06 22:52:37,241 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-11-06 22:52:37,241 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-06 22:52:40,587 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-06 22:52:40,587 INFO L284 CfgBuilder]: Removed 1 assume(true) statements. [2019-11-06 22:52:40,589 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 10:52:40 BoogieIcfgContainer [2019-11-06 22:52:40,589 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-06 22:52:40,590 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-06 22:52:40,590 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-06 22:52:40,593 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-06 22:52:40,593 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.11 10:52:35" (1/3) ... [2019-11-06 22:52:40,594 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@286511c6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 10:52:40, skipping insertion in model container [2019-11-06 22:52:40,595 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:52:36" (2/3) ... [2019-11-06 22:52:40,595 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@286511c6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 10:52:40, skipping insertion in model container [2019-11-06 22:52:40,595 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 10:52:40" (3/3) ... [2019-11-06 22:52:40,597 INFO L109 eAbstractionObserver]: Analyzing ICFG Problem15_label23.c [2019-11-06 22:52:40,607 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-06 22:52:40,615 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-06 22:52:40,627 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-06 22:52:40,666 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-06 22:52:40,666 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-06 22:52:40,667 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-06 22:52:40,667 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-06 22:52:40,667 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-06 22:52:40,667 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-06 22:52:40,667 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-06 22:52:40,667 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-06 22:52:40,713 INFO L276 IsEmpty]: Start isEmpty. Operand 437 states. [2019-11-06 22:52:40,718 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2019-11-06 22:52:40,719 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 22:52:40,719 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 22:52:40,721 INFO L410 AbstractCegarLoop]: === Iteration 1 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 22:52:40,725 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 22:52:40,725 INFO L82 PathProgramCache]: Analyzing trace with hash 1150521477, now seen corresponding path program 1 times [2019-11-06 22:52:40,734 INFO L161 FreeRefinementEngine]: Executing refinement strategy TAIPAN [2019-11-06 22:52:40,735 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1744216248] [2019-11-06 22:52:40,735 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 22:52:40,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 22:52:40,948 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 22:52:40,951 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1744216248] [2019-11-06 22:52:40,952 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 22:52:40,953 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-11-06 22:52:40,955 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1226485774] [2019-11-06 22:52:40,960 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-06 22:52:40,962 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-11-06 22:52:40,977 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-06 22:52:40,977 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-11-06 22:52:40,980 INFO L87 Difference]: Start difference. First operand 437 states. Second operand 4 states. [2019-11-06 22:52:47,148 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 22:52:47,148 INFO L93 Difference]: Finished difference Result 1554 states and 2845 transitions. [2019-11-06 22:52:47,149 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-06 22:52:47,150 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 23 [2019-11-06 22:52:47,151 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 22:52:47,186 INFO L225 Difference]: With dead ends: 1554 [2019-11-06 22:52:47,186 INFO L226 Difference]: Without dead ends: 1036 [2019-11-06 22:52:47,195 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-11-06 22:52:47,215 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1036 states. [2019-11-06 22:52:47,313 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1036 to 697. [2019-11-06 22:52:47,315 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 697 states. [2019-11-06 22:52:47,320 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 697 states to 697 states and 1188 transitions. [2019-11-06 22:52:47,323 INFO L78 Accepts]: Start accepts. Automaton has 697 states and 1188 transitions. Word has length 23 [2019-11-06 22:52:47,324 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 22:52:47,324 INFO L462 AbstractCegarLoop]: Abstraction has 697 states and 1188 transitions. [2019-11-06 22:52:47,325 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-06 22:52:47,325 INFO L276 IsEmpty]: Start isEmpty. Operand 697 states and 1188 transitions. [2019-11-06 22:52:47,331 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2019-11-06 22:52:47,331 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 22:52:47,332 INFO L410 BasicCegarLoop]: trace histogram [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, 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] [2019-11-06 22:52:47,333 INFO L410 AbstractCegarLoop]: === Iteration 2 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 22:52:47,333 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 22:52:47,333 INFO L82 PathProgramCache]: Analyzing trace with hash 1552013474, now seen corresponding path program 1 times [2019-11-06 22:52:47,334 INFO L161 FreeRefinementEngine]: Executing refinement strategy TAIPAN [2019-11-06 22:52:47,334 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2080755782] [2019-11-06 22:52:47,334 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 22:52:47,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 22:52:47,535 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 16 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 22:52:47,536 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2080755782] [2019-11-06 22:52:47,536 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 22:52:47,536 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-06 22:52:47,536 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [144788960] [2019-11-06 22:52:47,538 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-06 22:52:47,538 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-11-06 22:52:47,539 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-06 22:52:47,539 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-06 22:52:47,539 INFO L87 Difference]: Start difference. First operand 697 states and 1188 transitions. Second operand 3 states. [2019-11-06 22:52:50,566 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 22:52:50,566 INFO L93 Difference]: Finished difference Result 2009 states and 3472 transitions. [2019-11-06 22:52:50,568 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-06 22:52:50,568 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 92 [2019-11-06 22:52:50,569 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 22:52:50,576 INFO L225 Difference]: With dead ends: 2009 [2019-11-06 22:52:50,577 INFO L226 Difference]: Without dead ends: 1318 [2019-11-06 22:52:50,579 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-06 22:52:50,581 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1318 states. [2019-11-06 22:52:50,614 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1318 to 1315. [2019-11-06 22:52:50,615 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1315 states. [2019-11-06 22:52:50,621 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1315 states to 1315 states and 1928 transitions. [2019-11-06 22:52:50,622 INFO L78 Accepts]: Start accepts. Automaton has 1315 states and 1928 transitions. Word has length 92 [2019-11-06 22:52:50,622 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 22:52:50,623 INFO L462 AbstractCegarLoop]: Abstraction has 1315 states and 1928 transitions. [2019-11-06 22:52:50,623 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-06 22:52:50,623 INFO L276 IsEmpty]: Start isEmpty. Operand 1315 states and 1928 transitions. [2019-11-06 22:52:50,626 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2019-11-06 22:52:50,626 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 22:52:50,626 INFO L410 BasicCegarLoop]: trace histogram [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, 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] [2019-11-06 22:52:50,626 INFO L410 AbstractCegarLoop]: === Iteration 3 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 22:52:50,627 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 22:52:50,627 INFO L82 PathProgramCache]: Analyzing trace with hash 317241164, now seen corresponding path program 1 times [2019-11-06 22:52:50,627 INFO L161 FreeRefinementEngine]: Executing refinement strategy TAIPAN [2019-11-06 22:52:50,627 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [595441885] [2019-11-06 22:52:50,628 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 22:52:50,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 22:52:50,770 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 16 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 22:52:50,771 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [595441885] [2019-11-06 22:52:50,771 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 22:52:50,771 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-11-06 22:52:50,772 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1336904347] [2019-11-06 22:52:50,772 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-11-06 22:52:50,772 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-11-06 22:52:50,773 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-11-06 22:52:50,773 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2019-11-06 22:52:50,773 INFO L87 Difference]: Start difference. First operand 1315 states and 1928 transitions. Second operand 5 states. [2019-11-06 22:52:54,189 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 22:52:54,190 INFO L93 Difference]: Finished difference Result 3927 states and 5836 transitions. [2019-11-06 22:52:54,190 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-11-06 22:52:54,190 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 109 [2019-11-06 22:52:54,191 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 22:52:54,210 INFO L225 Difference]: With dead ends: 3927 [2019-11-06 22:52:54,210 INFO L226 Difference]: Without dead ends: 2618 [2019-11-06 22:52:54,216 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2019-11-06 22:52:54,221 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2618 states. [2019-11-06 22:52:54,318 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2618 to 2584. [2019-11-06 22:52:54,318 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2584 states. [2019-11-06 22:52:54,333 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2584 states to 2584 states and 3371 transitions. [2019-11-06 22:52:54,342 INFO L78 Accepts]: Start accepts. Automaton has 2584 states and 3371 transitions. Word has length 109 [2019-11-06 22:52:54,343 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 22:52:54,343 INFO L462 AbstractCegarLoop]: Abstraction has 2584 states and 3371 transitions. [2019-11-06 22:52:54,345 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-11-06 22:52:54,345 INFO L276 IsEmpty]: Start isEmpty. Operand 2584 states and 3371 transitions. [2019-11-06 22:52:54,361 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 298 [2019-11-06 22:52:54,361 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 22:52:54,365 INFO L410 BasicCegarLoop]: trace histogram [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, 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, 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, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 22:52:54,365 INFO L410 AbstractCegarLoop]: === Iteration 4 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 22:52:54,366 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 22:52:54,366 INFO L82 PathProgramCache]: Analyzing trace with hash 993341937, now seen corresponding path program 1 times [2019-11-06 22:52:54,367 INFO L161 FreeRefinementEngine]: Executing refinement strategy TAIPAN [2019-11-06 22:52:54,367 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1886937021] [2019-11-06 22:52:54,367 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 22:52:54,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 22:52:55,064 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-11-06 22:52:55,065 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1886937021] [2019-11-06 22:52:55,066 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2007536517] [2019-11-06 22:52:55,066 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 [2019-11-06 22:52:55,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 22:52:55,262 INFO L256 TraceCheckSpWp]: Trace formula consists of 438 conjuncts, 8 conjunts are in the unsatisfiable core [2019-11-06 22:52:55,280 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 22:52:55,598 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-11-06 22:52:55,599 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-06 22:52:56,236 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 13 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-11-06 22:52:56,237 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2019-11-06 22:52:56,237 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [5, 4] total 7 [2019-11-06 22:52:56,237 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [292594594] [2019-11-06 22:52:56,238 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-06 22:52:56,238 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-11-06 22:52:56,239 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-06 22:52:56,239 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-11-06 22:52:56,239 INFO L87 Difference]: Start difference. First operand 2584 states and 3371 transitions. Second operand 4 states. [2019-11-06 22:53:01,945 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 22:53:01,945 INFO L93 Difference]: Finished difference Result 7366 states and 9760 transitions. [2019-11-06 22:53:01,946 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-06 22:53:01,946 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 297 [2019-11-06 22:53:01,947 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 22:53:01,972 INFO L225 Difference]: With dead ends: 7366 [2019-11-06 22:53:01,972 INFO L226 Difference]: Without dead ends: 4788 [2019-11-06 22:53:01,980 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 601 GetRequests, 596 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-11-06 22:53:01,986 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4788 states. [2019-11-06 22:53:02,127 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4788 to 4165. [2019-11-06 22:53:02,127 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4165 states. [2019-11-06 22:53:02,142 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4165 states to 4165 states and 5432 transitions. [2019-11-06 22:53:02,143 INFO L78 Accepts]: Start accepts. Automaton has 4165 states and 5432 transitions. Word has length 297 [2019-11-06 22:53:02,144 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 22:53:02,145 INFO L462 AbstractCegarLoop]: Abstraction has 4165 states and 5432 transitions. [2019-11-06 22:53:02,145 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-06 22:53:02,145 INFO L276 IsEmpty]: Start isEmpty. Operand 4165 states and 5432 transitions. [2019-11-06 22:53:02,154 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 350 [2019-11-06 22:53:02,154 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 22:53:02,155 INFO L410 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 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, 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, 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] [2019-11-06 22:53:02,360 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 22:53:02,360 INFO L410 AbstractCegarLoop]: === Iteration 5 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 22:53:02,361 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 22:53:02,361 INFO L82 PathProgramCache]: Analyzing trace with hash 2040498893, now seen corresponding path program 1 times [2019-11-06 22:53:02,362 INFO L161 FreeRefinementEngine]: Executing refinement strategy TAIPAN [2019-11-06 22:53:02,362 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1416755062] [2019-11-06 22:53:02,363 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 22:53:02,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 22:53:02,731 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 154 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 22:53:02,732 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1416755062] [2019-11-06 22:53:02,732 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [332863994] [2019-11-06 22:53:02,732 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 [2019-11-06 22:53:02,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 22:53:02,859 INFO L256 TraceCheckSpWp]: Trace formula consists of 529 conjuncts, 2 conjunts are in the unsatisfiable core [2019-11-06 22:53:02,880 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 22:53:02,977 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 35 proven. 0 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2019-11-06 22:53:02,977 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-06 22:53:03,106 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 35 proven. 0 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2019-11-06 22:53:03,107 INFO L218 FreeRefinementEngine]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2019-11-06 22:53:03,107 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [6] total 8 [2019-11-06 22:53:03,107 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1637213175] [2019-11-06 22:53:03,108 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-06 22:53:03,109 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-11-06 22:53:03,109 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-06 22:53:03,109 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2019-11-06 22:53:03,109 INFO L87 Difference]: Start difference. First operand 4165 states and 5432 transitions. Second operand 4 states. [2019-11-06 22:53:06,689 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 22:53:06,690 INFO L93 Difference]: Finished difference Result 10815 states and 14653 transitions. [2019-11-06 22:53:06,691 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-06 22:53:06,691 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 349 [2019-11-06 22:53:06,692 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 22:53:06,721 INFO L225 Difference]: With dead ends: 10815 [2019-11-06 22:53:06,721 INFO L226 Difference]: Without dead ends: 6656 [2019-11-06 22:53:06,732 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 703 GetRequests, 697 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2019-11-06 22:53:06,739 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6656 states. [2019-11-06 22:53:06,880 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6656 to 6343. [2019-11-06 22:53:06,881 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6343 states. [2019-11-06 22:53:06,896 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6343 states to 6343 states and 8261 transitions. [2019-11-06 22:53:06,896 INFO L78 Accepts]: Start accepts. Automaton has 6343 states and 8261 transitions. Word has length 349 [2019-11-06 22:53:06,897 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 22:53:06,897 INFO L462 AbstractCegarLoop]: Abstraction has 6343 states and 8261 transitions. [2019-11-06 22:53:06,897 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-06 22:53:06,898 INFO L276 IsEmpty]: Start isEmpty. Operand 6343 states and 8261 transitions. [2019-11-06 22:53:06,907 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 397 [2019-11-06 22:53:06,907 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 22:53:06,908 INFO L410 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 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, 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, 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, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 22:53:07,112 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 22:53:07,112 INFO L410 AbstractCegarLoop]: === Iteration 6 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 22:53:07,113 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 22:53:07,113 INFO L82 PathProgramCache]: Analyzing trace with hash 1962388647, now seen corresponding path program 1 times [2019-11-06 22:53:07,113 INFO L161 FreeRefinementEngine]: Executing refinement strategy TAIPAN [2019-11-06 22:53:07,113 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1674279149] [2019-11-06 22:53:07,114 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 22:53:07,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 22:53:07,548 INFO L134 CoverageAnalysis]: Checked inductivity of 131 backedges. 129 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 22:53:07,549 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1674279149] [2019-11-06 22:53:07,549 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [607855245] [2019-11-06 22:53:07,549 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 [2019-11-06 22:53:07,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 22:53:07,762 INFO L256 TraceCheckSpWp]: Trace formula consists of 578 conjuncts, 4 conjunts are in the unsatisfiable core [2019-11-06 22:53:07,768 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 22:53:07,977 INFO L134 CoverageAnalysis]: Checked inductivity of 131 backedges. 129 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 22:53:07,978 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-06 22:53:08,161 INFO L134 CoverageAnalysis]: Checked inductivity of 131 backedges. 129 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 22:53:08,161 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAbstractInterpretation [48368760] [2019-11-06 22:53:08,169 INFO L211 CegarAbsIntRunner]: Running AI on error trace of length 397 [2019-11-06 22:53:08,245 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-11-06 22:53:08,246 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2)