/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/nla-digbench/cohencu.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-fb55353 [2019-11-07 00:36:21,079 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-07 00:36:21,082 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-07 00:36:21,094 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2019-11-07 00:36:21,104 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-07 00:36:21,105 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-07 00:36:21,106 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-07 00:36:21,107 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-07 00:36:21,108 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-07 00:36:21,108 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-07 00:36:21,110 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-07 00:36:21,112 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-07 00:36:21,114 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-07 00:36:21,117 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-07 00:36:21,118 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-07 00:36:21,121 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-07 00:36:21,125 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-11-07 00:36:21,138 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-07 00:36:21,141 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-07 00:36:21,143 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-07 00:36:21,144 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 [2019-11-07 00:36:21,165 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-07 00:36:21,165 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-07 00:36:21,167 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-07 00:36:21,168 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-07 00:36:21,168 INFO L138 SettingsManager]: * Use SBE=true [2019-11-07 00:36:21,168 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-07 00:36:21,168 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-07 00:36:21,168 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-07 00:36:21,169 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-07 00:36:21,169 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-07 00:36:21,170 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-07 00:36:21,170 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-07 00:36:21,170 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-07 00:36:21,170 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-07 00:36:21,171 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-07 00:36:21,171 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-07 00:36:21,171 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-07 00:36:21,171 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-07 00:36:21,171 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-07 00:36:21,172 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-07 00:36:21,172 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-07 00:36:21,172 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-07 00:36:21,172 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-07 00:36:21,173 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-07 00:36:21,173 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-07 00:36:21,173 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-07 00:36:21,173 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-07 00:36:21,173 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-07 00:36:21,174 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 [2019-11-07 00:36:21,452 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-07 00:36:21,467 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-07 00:36:21,474 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-07 00:36:21,475 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-07 00:36:21,476 INFO L275 PluginConnector]: CDTParser initialized [2019-11-07 00:36:21,477 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench/cohencu.c [2019-11-07 00:36:21,550 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/597f9c89c/093dd0c4e8634a8d80239d9f69ba0344/FLAG7a5fc99b1 [2019-11-07 00:36:22,044 INFO L306 CDTParser]: Found 1 translation units. [2019-11-07 00:36:22,046 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench/cohencu.c [2019-11-07 00:36:22,053 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/597f9c89c/093dd0c4e8634a8d80239d9f69ba0344/FLAG7a5fc99b1 [2019-11-07 00:36:22,409 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/597f9c89c/093dd0c4e8634a8d80239d9f69ba0344 [2019-11-07 00:36:22,435 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-07 00:36:22,440 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-11-07 00:36:22,444 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-07 00:36:22,445 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-07 00:36:22,448 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-07 00:36:22,449 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 12:36:22" (1/1) ... [2019-11-07 00:36:22,452 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@dd4af8d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:36:22, skipping insertion in model container [2019-11-07 00:36:22,453 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 12:36:22" (1/1) ... [2019-11-07 00:36:22,461 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-11-07 00:36:22,479 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-11-07 00:36:22,679 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-07 00:36:22,682 INFO L188 MainTranslator]: Completed pre-run [2019-11-07 00:36:22,711 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-07 00:36:22,817 INFO L192 MainTranslator]: Completed translation [2019-11-07 00:36:22,817 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:36:22 WrapperNode [2019-11-07 00:36:22,817 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-07 00:36:22,818 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-07 00:36:22,818 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-07 00:36:22,818 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-07 00:36:22,831 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:36:22" (1/1) ... [2019-11-07 00:36:22,831 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:36:22" (1/1) ... [2019-11-07 00:36:22,837 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:36:22" (1/1) ... [2019-11-07 00:36:22,837 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:36:22" (1/1) ... [2019-11-07 00:36:22,845 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:36:22" (1/1) ... [2019-11-07 00:36:22,850 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:36:22" (1/1) ... [2019-11-07 00:36:22,851 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:36:22" (1/1) ... [2019-11-07 00:36:22,853 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-07 00:36:22,853 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-07 00:36:22,853 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-07 00:36:22,854 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-07 00:36:22,854 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:36:22" (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 [2019-11-07 00:36:22,910 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-11-07 00:36:22,910 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-07 00:36:22,910 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-11-07 00:36:22,910 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-11-07 00:36:22,910 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-11-07 00:36:22,911 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-11-07 00:36:22,911 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assume [2019-11-07 00:36:22,911 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-11-07 00:36:22,911 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-11-07 00:36:22,911 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-11-07 00:36:22,911 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-07 00:36:23,158 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-07 00:36:23,159 INFO L284 CfgBuilder]: Removed 1 assume(true) statements. [2019-11-07 00:36:23,160 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 12:36:23 BoogieIcfgContainer [2019-11-07 00:36:23,161 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-07 00:36:23,162 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-07 00:36:23,162 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-07 00:36:23,165 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-07 00:36:23,166 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 12:36:22" (1/3) ... [2019-11-07 00:36:23,166 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@72b18d8f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 12:36:23, skipping insertion in model container [2019-11-07 00:36:23,167 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:36:22" (2/3) ... [2019-11-07 00:36:23,167 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@72b18d8f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 12:36:23, skipping insertion in model container [2019-11-07 00:36:23,167 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 12:36:23" (3/3) ... [2019-11-07 00:36:23,169 INFO L109 eAbstractionObserver]: Analyzing ICFG cohencu.c [2019-11-07 00:36:23,179 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-07 00:36:23,188 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-07 00:36:23,205 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-07 00:36:23,236 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-07 00:36:23,236 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-07 00:36:23,236 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-07 00:36:23,236 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-07 00:36:23,236 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-07 00:36:23,237 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-07 00:36:23,237 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-07 00:36:23,237 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-07 00:36:23,266 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states. [2019-11-07 00:36:23,273 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2019-11-07 00:36:23,274 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 00:36:23,275 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 00:36:23,277 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 00:36:23,283 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 00:36:23,283 INFO L82 PathProgramCache]: Analyzing trace with hash 2145967090, now seen corresponding path program 1 times [2019-11-07 00:36:23,300 INFO L161 FreeRefinementEngine]: Executing refinement strategy TAIPAN [2019-11-07 00:36:23,302 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1646304511] [2019-11-07 00:36:23,303 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 00:36:23,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 00:36:23,411 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 00:36:23,412 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1646304511] [2019-11-07 00:36:23,413 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-07 00:36:23,413 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2019-11-07 00:36:23,414 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1599742704] [2019-11-07 00:36:23,418 INFO L442 AbstractCegarLoop]: Interpolant automaton has 2 states [2019-11-07 00:36:23,420 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-11-07 00:36:23,431 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2019-11-07 00:36:23,432 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-11-07 00:36:23,434 INFO L87 Difference]: Start difference. First operand 29 states. Second operand 2 states. [2019-11-07 00:36:23,463 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 00:36:23,464 INFO L93 Difference]: Finished difference Result 53 states and 90 transitions. [2019-11-07 00:36:23,464 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2019-11-07 00:36:23,465 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2019-11-07 00:36:23,466 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 00:36:23,475 INFO L225 Difference]: With dead ends: 53 [2019-11-07 00:36:23,476 INFO L226 Difference]: Without dead ends: 24 [2019-11-07 00:36:23,480 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-11-07 00:36:23,499 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2019-11-07 00:36:23,524 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2019-11-07 00:36:23,526 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2019-11-07 00:36:23,529 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 34 transitions. [2019-11-07 00:36:23,533 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 34 transitions. Word has length 10 [2019-11-07 00:36:23,534 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 00:36:23,534 INFO L462 AbstractCegarLoop]: Abstraction has 24 states and 34 transitions. [2019-11-07 00:36:23,534 INFO L463 AbstractCegarLoop]: Interpolant automaton has 2 states. [2019-11-07 00:36:23,534 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 34 transitions. [2019-11-07 00:36:23,536 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2019-11-07 00:36:23,536 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 00:36:23,536 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 00:36:23,537 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 00:36:23,539 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 00:36:23,539 INFO L82 PathProgramCache]: Analyzing trace with hash 2134586928, now seen corresponding path program 1 times [2019-11-07 00:36:23,539 INFO L161 FreeRefinementEngine]: Executing refinement strategy TAIPAN [2019-11-07 00:36:23,540 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1462907095] [2019-11-07 00:36:23,540 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 00:36:23,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 00:36:23,802 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 00:36:23,802 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1462907095] [2019-11-07 00:36:23,804 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-07 00:36:23,805 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-11-07 00:36:23,805 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [12041732] [2019-11-07 00:36:23,807 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-11-07 00:36:23,807 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-11-07 00:36:23,808 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-11-07 00:36:23,808 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2019-11-07 00:36:23,808 INFO L87 Difference]: Start difference. First operand 24 states and 34 transitions. Second operand 5 states. [2019-11-07 00:36:23,973 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 00:36:23,973 INFO L93 Difference]: Finished difference Result 30 states and 39 transitions. [2019-11-07 00:36:23,973 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-11-07 00:36:23,974 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 10 [2019-11-07 00:36:23,974 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 00:36:23,975 INFO L225 Difference]: With dead ends: 30 [2019-11-07 00:36:23,975 INFO L226 Difference]: Without dead ends: 28 [2019-11-07 00:36:23,976 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2019-11-07 00:36:23,977 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2019-11-07 00:36:23,999 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2019-11-07 00:36:24,001 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2019-11-07 00:36:24,003 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 37 transitions. [2019-11-07 00:36:24,003 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 37 transitions. Word has length 10 [2019-11-07 00:36:24,004 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 00:36:24,005 INFO L462 AbstractCegarLoop]: Abstraction has 28 states and 37 transitions. [2019-11-07 00:36:24,005 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-11-07 00:36:24,005 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 37 transitions. [2019-11-07 00:36:24,005 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-11-07 00:36:24,006 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 00:36:24,006 INFO L410 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 00:36:24,006 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 00:36:24,007 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 00:36:24,007 INFO L82 PathProgramCache]: Analyzing trace with hash 1496147284, now seen corresponding path program 1 times [2019-11-07 00:36:24,007 INFO L161 FreeRefinementEngine]: Executing refinement strategy TAIPAN [2019-11-07 00:36:24,007 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1215771455] [2019-11-07 00:36:24,008 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 00:36:24,022 ERROR L268 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-11-07 00:36:24,023 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1834581266] [2019-11-07 00:36:24,023 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 [2019-11-07 00:36:24,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 00:36:24,080 INFO L256 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 17 conjunts are in the unsatisfiable core [2019-11-07 00:36:24,089 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 00:36:24,197 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 00:36:24,198 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 00:36:24,268 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-07 00:36:24,306 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-07 00:36:24,309 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-07 00:36:24,346 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 00:36:24,348 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1215771455] [2019-11-07 00:36:24,348 INFO L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-07 00:36:24,348 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1834581266] [2019-11-07 00:36:24,349 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAbstractInterpretation [1798641525] [2019-11-07 00:36:24,357 INFO L211 CegarAbsIntRunner]: Running AI on error trace of length 16 [2019-11-07 00:36:24,396 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-11-07 00:36:24,397 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-11-07 00:36:24,518 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2019-11-07 00:36:24,520 INFO L272 AbstractInterpreter]: Visited 14 different actions 19 times. Never merged. Never widened. Performed 18 root evaluator evaluations with a maximum evaluation depth of 8. Performed 18 inverse root evaluator evaluations with a maximum inverse evaluation depth of 8. Never found a fixpoint. Largest state had 6 variables. [2019-11-07 00:36:24,529 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 00:36:24,530 INFO L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-07 00:36:24,534 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-07 00:36:24,534 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 12 [2019-11-07 00:36:24,535 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1220269657] [2019-11-07 00:36:24,535 INFO L442 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-11-07 00:36:24,536 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-11-07 00:36:24,536 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-11-07 00:36:24,536 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2019-11-07 00:36:24,538 INFO L87 Difference]: Start difference. First operand 28 states and 37 transitions. Second operand 12 states. [2019-11-07 00:36:25,020 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 00:36:25,020 INFO L93 Difference]: Finished difference Result 53 states and 72 transitions. [2019-11-07 00:36:25,021 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-11-07 00:36:25,021 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 15 [2019-11-07 00:36:25,022 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 00:36:25,025 INFO L225 Difference]: With dead ends: 53 [2019-11-07 00:36:25,025 INFO L226 Difference]: Without dead ends: 51 [2019-11-07 00:36:25,026 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=47, Invalid=135, Unknown=0, NotChecked=0, Total=182 [2019-11-07 00:36:25,026 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2019-11-07 00:36:25,040 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 48. [2019-11-07 00:36:25,040 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2019-11-07 00:36:25,042 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 66 transitions. [2019-11-07 00:36:25,042 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 66 transitions. Word has length 15 [2019-11-07 00:36:25,042 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 00:36:25,042 INFO L462 AbstractCegarLoop]: Abstraction has 48 states and 66 transitions. [2019-11-07 00:36:25,043 INFO L463 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-11-07 00:36:25,043 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 66 transitions. [2019-11-07 00:36:25,043 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2019-11-07 00:36:25,043 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 00:36:25,044 INFO L410 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 00:36:25,252 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 00:36:25,253 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 00:36:25,253 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 00:36:25,253 INFO L82 PathProgramCache]: Analyzing trace with hash 1472996464, now seen corresponding path program 1 times [2019-11-07 00:36:25,254 INFO L161 FreeRefinementEngine]: Executing refinement strategy TAIPAN [2019-11-07 00:36:25,254 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [992623011] [2019-11-07 00:36:25,255 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 00:36:25,262 ERROR L268 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-11-07 00:36:25,263 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [384982494] [2019-11-07 00:36:25,263 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 [2019-11-07 00:36:25,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 00:36:25,291 INFO L256 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 17 conjunts are in the unsatisfiable core [2019-11-07 00:36:25,293 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 00:36:25,359 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-07 00:36:25,359 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 00:36:25,410 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-07 00:36:25,432 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-07 00:36:25,467 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-07 00:36:25,468 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [992623011] [2019-11-07 00:36:25,470 INFO L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-07 00:36:25,470 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [384982494] [2019-11-07 00:36:25,470 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAbstractInterpretation [1889613928] [2019-11-07 00:36:25,470 INFO L211 CegarAbsIntRunner]: Running AI on error trace of length 21 [2019-11-07 00:36:25,474 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-11-07 00:36:25,474 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-11-07 00:36:25,538 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2019-11-07 00:36:25,539 INFO L272 AbstractInterpreter]: Visited 15 different actions 20 times. Never merged. Never widened. Performed 19 root evaluator evaluations with a maximum evaluation depth of 9. Performed 19 inverse root evaluator evaluations with a maximum inverse evaluation depth of 9. Never found a fixpoint. Largest state had 6 variables. [2019-11-07 00:36:25,539 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 00:36:25,539 INFO L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-07 00:36:25,539 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-07 00:36:25,540 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 12 [2019-11-07 00:36:25,540 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1103393302] [2019-11-07 00:36:25,540 INFO L442 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-11-07 00:36:25,541 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-11-07 00:36:25,541 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-11-07 00:36:25,541 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2019-11-07 00:36:25,541 INFO L87 Difference]: Start difference. First operand 48 states and 66 transitions. Second operand 12 states. [2019-11-07 00:36:25,860 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 00:36:25,860 INFO L93 Difference]: Finished difference Result 55 states and 72 transitions. [2019-11-07 00:36:25,861 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-11-07 00:36:25,861 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 20 [2019-11-07 00:36:25,861 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 00:36:25,863 INFO L225 Difference]: With dead ends: 55 [2019-11-07 00:36:25,863 INFO L226 Difference]: Without dead ends: 53 [2019-11-07 00:36:25,864 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=47, Invalid=135, Unknown=0, NotChecked=0, Total=182 [2019-11-07 00:36:25,864 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2019-11-07 00:36:25,876 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 52. [2019-11-07 00:36:25,876 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2019-11-07 00:36:25,880 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 69 transitions. [2019-11-07 00:36:25,880 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 69 transitions. Word has length 20 [2019-11-07 00:36:25,880 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 00:36:25,881 INFO L462 AbstractCegarLoop]: Abstraction has 52 states and 69 transitions. [2019-11-07 00:36:25,881 INFO L463 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-11-07 00:36:25,881 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 69 transitions. [2019-11-07 00:36:25,885 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2019-11-07 00:36:25,885 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 00:36:25,885 INFO L410 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 00:36:26,086 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 00:36:26,086 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 00:36:26,087 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 00:36:26,088 INFO L82 PathProgramCache]: Analyzing trace with hash -378433900, now seen corresponding path program 1 times [2019-11-07 00:36:26,088 INFO L161 FreeRefinementEngine]: Executing refinement strategy TAIPAN [2019-11-07 00:36:26,088 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [428046279] [2019-11-07 00:36:26,089 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 00:36:26,095 ERROR L268 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-11-07 00:36:26,096 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [306147490] [2019-11-07 00:36:26,096 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 [2019-11-07 00:36:26,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 00:36:26,156 INFO L256 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 19 conjunts are in the unsatisfiable core [2019-11-07 00:36:26,158 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 00:36:26,211 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 5 proven. 7 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-11-07 00:36:26,211 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 00:36:26,274 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-07 00:36:26,305 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-07 00:36:26,342 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 5 proven. 7 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-11-07 00:36:26,343 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [428046279] [2019-11-07 00:36:26,343 INFO L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-07 00:36:26,343 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [306147490] [2019-11-07 00:36:26,343 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAbstractInterpretation [1914166492] [2019-11-07 00:36:26,358 INFO L211 CegarAbsIntRunner]: Running AI on error trace of length 26 [2019-11-07 00:36:26,360 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-11-07 00:36:26,360 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-11-07 00:36:26,388 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2019-11-07 00:36:26,391 INFO L272 AbstractInterpreter]: Visited 15 different actions 20 times. Never merged. Never widened. Performed 19 root evaluator evaluations with a maximum evaluation depth of 9. Performed 19 inverse root evaluator evaluations with a maximum inverse evaluation depth of 9. Never found a fixpoint. Largest state had 6 variables. [2019-11-07 00:36:26,391 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 00:36:26,391 INFO L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-07 00:36:26,392 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-07 00:36:26,392 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 12 [2019-11-07 00:36:26,392 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2021541031] [2019-11-07 00:36:26,393 INFO L442 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-11-07 00:36:26,393 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-11-07 00:36:26,393 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-11-07 00:36:26,395 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2019-11-07 00:36:26,395 INFO L87 Difference]: Start difference. First operand 52 states and 69 transitions. Second operand 12 states. [2019-11-07 00:36:27,497 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 00:36:27,497 INFO L93 Difference]: Finished difference Result 68 states and 87 transitions. [2019-11-07 00:36:27,497 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-11-07 00:36:27,497 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 25 [2019-11-07 00:36:27,498 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 00:36:27,499 INFO L225 Difference]: With dead ends: 68 [2019-11-07 00:36:27,500 INFO L226 Difference]: Without dead ends: 59 [2019-11-07 00:36:27,501 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=47, Invalid=135, Unknown=0, NotChecked=0, Total=182 [2019-11-07 00:36:27,501 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2019-11-07 00:36:27,512 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2019-11-07 00:36:27,512 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2019-11-07 00:36:27,513 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 71 transitions. [2019-11-07 00:36:27,513 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 71 transitions. Word has length 25 [2019-11-07 00:36:27,514 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 00:36:27,514 INFO L462 AbstractCegarLoop]: Abstraction has 59 states and 71 transitions. [2019-11-07 00:36:27,514 INFO L463 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-11-07 00:36:27,514 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 71 transitions. [2019-11-07 00:36:27,515 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2019-11-07 00:36:27,516 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 00:36:27,516 INFO L410 BasicCegarLoop]: trace histogram [8, 7, 7, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 00:36:27,719 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 00:36:27,719 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 00:36:27,719 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 00:36:27,719 INFO L82 PathProgramCache]: Analyzing trace with hash -223920524, now seen corresponding path program 1 times [2019-11-07 00:36:27,720 INFO L161 FreeRefinementEngine]: Executing refinement strategy TAIPAN [2019-11-07 00:36:27,720 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [993142787] [2019-11-07 00:36:27,720 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 00:36:27,754 ERROR L268 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-11-07 00:36:27,755 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [144411670] [2019-11-07 00:36:27,758 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 00:36:27,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 00:36:27,826 INFO L256 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 23 conjunts are in the unsatisfiable core [2019-11-07 00:36:27,829 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 00:36:27,934 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 13 proven. 23 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2019-11-07 00:36:27,935 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 00:36:28,014 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-07 00:36:28,039 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-07 00:36:28,040 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-07 00:36:28,073 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 13 proven. 23 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2019-11-07 00:36:28,073 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [993142787] [2019-11-07 00:36:28,073 INFO L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-07 00:36:28,073 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [144411670] [2019-11-07 00:36:28,074 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAbstractInterpretation [640699516] [2019-11-07 00:36:28,074 INFO L211 CegarAbsIntRunner]: Running AI on error trace of length 48 [2019-11-07 00:36:28,077 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-11-07 00:36:28,078 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-11-07 00:36:28,112 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2019-11-07 00:36:28,112 INFO L272 AbstractInterpreter]: Visited 15 different actions 20 times. Never merged. Never widened. Performed 19 root evaluator evaluations with a maximum evaluation depth of 9. Performed 19 inverse root evaluator evaluations with a maximum inverse evaluation depth of 9. Never found a fixpoint. Largest state had 6 variables. [2019-11-07 00:36:28,112 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 00:36:28,115 INFO L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-07 00:36:28,115 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-07 00:36:28,115 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 14 [2019-11-07 00:36:28,115 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [550309009] [2019-11-07 00:36:28,116 INFO L442 AbstractCegarLoop]: Interpolant automaton has 14 states [2019-11-07 00:36:28,116 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-11-07 00:36:28,117 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2019-11-07 00:36:28,117 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=143, Unknown=0, NotChecked=0, Total=182 [2019-11-07 00:36:28,117 INFO L87 Difference]: Start difference. First operand 59 states and 71 transitions. Second operand 14 states. [2019-11-07 00:36:28,566 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 00:36:28,566 INFO L93 Difference]: Finished difference Result 76 states and 92 transitions. [2019-11-07 00:36:28,567 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-11-07 00:36:28,567 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 47 [2019-11-07 00:36:28,568 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 00:36:28,569 INFO L225 Difference]: With dead ends: 76 [2019-11-07 00:36:28,569 INFO L226 Difference]: Without dead ends: 74 [2019-11-07 00:36:28,570 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 81 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=76, Invalid=266, Unknown=0, NotChecked=0, Total=342 [2019-11-07 00:36:28,570 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2019-11-07 00:36:28,583 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 73. [2019-11-07 00:36:28,583 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2019-11-07 00:36:28,584 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 89 transitions. [2019-11-07 00:36:28,585 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 89 transitions. Word has length 47 [2019-11-07 00:36:28,585 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 00:36:28,585 INFO L462 AbstractCegarLoop]: Abstraction has 73 states and 89 transitions. [2019-11-07 00:36:28,585 INFO L463 AbstractCegarLoop]: Interpolant automaton has 14 states. [2019-11-07 00:36:28,585 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 89 transitions. [2019-11-07 00:36:28,587 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2019-11-07 00:36:28,587 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 00:36:28,587 INFO L410 BasicCegarLoop]: trace histogram [10, 9, 9, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 00:36:28,791 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 00:36:28,792 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 00:36:28,792 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 00:36:28,793 INFO L82 PathProgramCache]: Analyzing trace with hash 1224693684, now seen corresponding path program 2 times [2019-11-07 00:36:28,793 INFO L161 FreeRefinementEngine]: Executing refinement strategy TAIPAN [2019-11-07 00:36:28,793 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1073456646] [2019-11-07 00:36:28,793 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 00:36:28,807 ERROR L268 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-11-07 00:36:28,807 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1074402997] [2019-11-07 00:36:28,807 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 00:36:28,876 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2019-11-07 00:36:28,876 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 00:36:28,877 INFO L256 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 18 conjunts are in the unsatisfiable core [2019-11-07 00:36:28,885 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 00:36:28,938 INFO L134 CoverageAnalysis]: Checked inductivity of 168 backedges. 18 proven. 6 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2019-11-07 00:36:28,939 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 00:36:29,074 INFO L134 CoverageAnalysis]: Checked inductivity of 168 backedges. 18 proven. 0 refuted. 0 times theorem prover too weak. 150 trivial. 0 not checked. [2019-11-07 00:36:29,074 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1073456646] [2019-11-07 00:36:29,075 INFO L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-07 00:36:29,075 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1074402997] [2019-11-07 00:36:29,075 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2019-11-07 00:36:29,075 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 9 [2019-11-07 00:36:29,075 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [235173506] [2019-11-07 00:36:29,076 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-11-07 00:36:29,076 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-11-07 00:36:29,076 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-11-07 00:36:29,077 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2019-11-07 00:36:29,077 INFO L87 Difference]: Start difference. First operand 73 states and 89 transitions. Second operand 5 states. [2019-11-07 00:36:29,303 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 00:36:29,303 INFO L93 Difference]: Finished difference Result 83 states and 97 transitions. [2019-11-07 00:36:29,304 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-11-07 00:36:29,304 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 57 [2019-11-07 00:36:29,304 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 00:36:29,305 INFO L225 Difference]: With dead ends: 83 [2019-11-07 00:36:29,305 INFO L226 Difference]: Without dead ends: 79 [2019-11-07 00:36:29,306 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 105 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2019-11-07 00:36:29,307 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2019-11-07 00:36:29,325 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2019-11-07 00:36:29,326 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2019-11-07 00:36:29,327 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 90 transitions. [2019-11-07 00:36:29,327 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 90 transitions. Word has length 57 [2019-11-07 00:36:29,328 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 00:36:29,328 INFO L462 AbstractCegarLoop]: Abstraction has 79 states and 90 transitions. [2019-11-07 00:36:29,328 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-11-07 00:36:29,328 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 90 transitions. [2019-11-07 00:36:29,329 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2019-11-07 00:36:29,329 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 00:36:29,330 INFO L410 BasicCegarLoop]: trace histogram [12, 11, 11, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 00:36:29,533 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 00:36:29,534 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 00:36:29,534 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 00:36:29,534 INFO L82 PathProgramCache]: Analyzing trace with hash -1975458643, now seen corresponding path program 1 times [2019-11-07 00:36:29,535 INFO L161 FreeRefinementEngine]: Executing refinement strategy TAIPAN [2019-11-07 00:36:29,535 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [909556369] [2019-11-07 00:36:29,536 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 00:36:29,543 ERROR L268 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-11-07 00:36:29,543 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1966409494] [2019-11-07 00:36:29,544 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 00:36:29,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 00:36:29,595 INFO L256 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 26 conjunts are in the unsatisfiable core [2019-11-07 00:36:29,605 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 00:36:29,660 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-07 00:36:29,703 INFO L134 CoverageAnalysis]: Checked inductivity of 249 backedges. 21 proven. 38 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2019-11-07 00:36:29,703 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 00:36:31,676 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-07 00:36:31,686 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-07 00:36:31,810 INFO L134 CoverageAnalysis]: Checked inductivity of 249 backedges. 23 proven. 36 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2019-11-07 00:36:31,810 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [909556369] [2019-11-07 00:36:31,810 INFO L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-07 00:36:31,811 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1966409494] [2019-11-07 00:36:31,811 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAbstractInterpretation [1433945990] [2019-11-07 00:36:31,811 INFO L211 CegarAbsIntRunner]: Running AI on error trace of length 69 [2019-11-07 00:36:31,813 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-11-07 00:36:31,813 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-11-07 00:36:31,829 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2019-11-07 00:36:31,830 INFO L272 AbstractInterpreter]: Visited 15 different actions 20 times. Never merged. Never widened. Performed 19 root evaluator evaluations with a maximum evaluation depth of 9. Performed 19 inverse root evaluator evaluations with a maximum inverse evaluation depth of 9. Never found a fixpoint. Largest state had 6 variables. [2019-11-07 00:36:31,830 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 00:36:31,830 INFO L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-07 00:36:31,830 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-07 00:36:31,830 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 14 [2019-11-07 00:36:31,831 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [38095996] [2019-11-07 00:36:31,831 INFO L442 AbstractCegarLoop]: Interpolant automaton has 14 states [2019-11-07 00:36:31,832 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-11-07 00:36:31,832 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2019-11-07 00:36:31,832 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2019-11-07 00:36:31,832 INFO L87 Difference]: Start difference. First operand 79 states and 90 transitions. Second operand 14 states. [2019-11-07 00:36:32,695 WARN L191 SmtUtils]: Spent 754.00 ms on a formula simplification that was a NOOP. DAG size: 27 [2019-11-07 00:36:40,527 WARN L191 SmtUtils]: Spent 2.18 s on a formula simplification that was a NOOP. DAG size: 27 [2019-11-07 00:37:01,860 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 00:37:01,860 INFO L93 Difference]: Finished difference Result 85 states and 95 transitions. [2019-11-07 00:37:01,860 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-11-07 00:37:01,861 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 68 [2019-11-07 00:37:01,861 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 00:37:01,862 INFO L225 Difference]: With dead ends: 85 [2019-11-07 00:37:01,862 INFO L226 Difference]: Without dead ends: 83 [2019-11-07 00:37:01,863 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 122 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 15.7s TimeCoverageRelationStatistics Valid=80, Invalid=297, Unknown=3, NotChecked=0, Total=380 [2019-11-07 00:37:01,863 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2019-11-07 00:37:01,876 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 83. [2019-11-07 00:37:01,876 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2019-11-07 00:37:01,877 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 93 transitions. [2019-11-07 00:37:01,878 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 93 transitions. Word has length 68 [2019-11-07 00:37:01,878 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 00:37:01,878 INFO L462 AbstractCegarLoop]: Abstraction has 83 states and 93 transitions. [2019-11-07 00:37:01,878 INFO L463 AbstractCegarLoop]: Interpolant automaton has 14 states. [2019-11-07 00:37:01,879 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 93 transitions. [2019-11-07 00:37:01,880 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2019-11-07 00:37:01,880 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 00:37:01,880 INFO L410 BasicCegarLoop]: trace histogram [13, 12, 12, 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] [2019-11-07 00:37:02,083 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 00:37:02,084 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 00:37:02,084 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 00:37:02,085 INFO L82 PathProgramCache]: Analyzing trace with hash 713083767, now seen corresponding path program 1 times [2019-11-07 00:37:02,085 INFO L161 FreeRefinementEngine]: Executing refinement strategy TAIPAN [2019-11-07 00:37:02,085 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [977762606] [2019-11-07 00:37:02,085 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 00:37:02,093 ERROR L268 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-11-07 00:37:02,094 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [834196669] [2019-11-07 00:37:02,094 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 00:37:02,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 00:37:02,141 INFO L256 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 24 conjunts are in the unsatisfiable core [2019-11-07 00:37:02,144 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 00:37:02,232 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-07 00:37:02,260 INFO L134 CoverageAnalysis]: Checked inductivity of 295 backedges. 23 proven. 41 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2019-11-07 00:37:02,260 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 00:37:02,453 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-07 00:37:02,487 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-07 00:37:02,523 INFO L134 CoverageAnalysis]: Checked inductivity of 295 backedges. 23 proven. 41 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2019-11-07 00:37:02,524 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [977762606] [2019-11-07 00:37:02,524 INFO L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-07 00:37:02,524 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [834196669] [2019-11-07 00:37:02,524 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAbstractInterpretation [1767620879] [2019-11-07 00:37:02,525 INFO L211 CegarAbsIntRunner]: Running AI on error trace of length 74 [2019-11-07 00:37:02,528 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-11-07 00:37:02,529 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-11-07 00:37:02,554 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2019-11-07 00:37:02,555 INFO L272 AbstractInterpreter]: Visited 15 different actions 20 times. Never merged. Never widened. Performed 19 root evaluator evaluations with a maximum evaluation depth of 9. Performed 19 inverse root evaluator evaluations with a maximum inverse evaluation depth of 9. Never found a fixpoint. Largest state had 6 variables. [2019-11-07 00:37:02,555 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 00:37:02,555 INFO L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-07 00:37:02,556 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-07 00:37:02,556 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 15 [2019-11-07 00:37:02,556 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [931522587] [2019-11-07 00:37:02,557 INFO L442 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-11-07 00:37:02,558 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-11-07 00:37:02,558 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-11-07 00:37:02,558 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=167, Unknown=0, NotChecked=0, Total=210 [2019-11-07 00:37:02,558 INFO L87 Difference]: Start difference. First operand 83 states and 93 transitions. Second operand 15 states.