/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 --traceabstraction.trace.refinement.strategy SIFA_TAIPAN --sifa.abstract.domain CompoundDomain --rcfgbuilder.size.of.a.code.block LoopFreeBlock --sifa.call.summarizer TopInputCallSummarizer --sifa.fluid SizeLimitFluid --sifa.simplification.technique SIMPLIFY_QUICK -i ../../../trunk/examples/svcomp/array-examples/standard_two_index_08.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-fb55353 [2019-11-07 01:27:24,082 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-07 01:27:24,083 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-07 01:27:24,095 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2019-11-07 01:27:24,104 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-07 01:27:24,105 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-07 01:27:24,106 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-07 01:27:24,108 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-07 01:27:24,108 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-07 01:27:24,109 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-07 01:27:24,111 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-07 01:27:24,113 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-07 01:27:24,115 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-07 01:27:24,116 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-07 01:27:24,117 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-07 01:27:24,118 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-07 01:27:24,120 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-11-07 01:27:24,129 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-07 01:27:24,130 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-07 01:27:24,130 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-07 01:27:24,131 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 01:27:24,145 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-07 01:27:24,146 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-07 01:27:24,147 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-07 01:27:24,147 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-07 01:27:24,147 INFO L138 SettingsManager]: * Use SBE=true [2019-11-07 01:27:24,148 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-07 01:27:24,148 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-07 01:27:24,148 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-07 01:27:24,148 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-07 01:27:24,148 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-07 01:27:24,149 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-07 01:27:24,149 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-07 01:27:24,149 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-07 01:27:24,149 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-07 01:27:24,149 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-07 01:27:24,150 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-07 01:27:24,150 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-07 01:27:24,150 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-07 01:27:24,150 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-07 01:27:24,150 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-07 01:27:24,151 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-07 01:27:24,151 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-07 01:27:24,151 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-07 01:27:24,151 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-07 01:27:24,151 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-07 01:27:24,152 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-07 01:27:24,152 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-07 01:27:24,152 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-07 01:27:24,152 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> SIFA_TAIPAN Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> CompoundDomain Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: Size of a code block -> LoopFreeBlock Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Call Summarizer -> TopInputCallSummarizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Fluid -> SizeLimitFluid Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Simplification Technique -> SIMPLIFY_QUICK [2019-11-07 01:27:24,437 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-07 01:27:24,454 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-07 01:27:24,459 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-07 01:27:24,461 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-07 01:27:24,461 INFO L275 PluginConnector]: CDTParser initialized [2019-11-07 01:27:24,462 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-examples/standard_two_index_08.i [2019-11-07 01:27:24,527 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/730d64b6b/422bac1a3752498da3736dd5ddc20a1a/FLAGf03449065 [2019-11-07 01:27:24,993 INFO L306 CDTParser]: Found 1 translation units. [2019-11-07 01:27:24,995 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-examples/standard_two_index_08.i [2019-11-07 01:27:25,001 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/730d64b6b/422bac1a3752498da3736dd5ddc20a1a/FLAGf03449065 [2019-11-07 01:27:25,389 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/730d64b6b/422bac1a3752498da3736dd5ddc20a1a [2019-11-07 01:27:25,398 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-07 01:27:25,399 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-11-07 01:27:25,400 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-07 01:27:25,400 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-07 01:27:25,404 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-07 01:27:25,405 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:27:25" (1/1) ... [2019-11-07 01:27:25,408 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@798903f4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:27:25, skipping insertion in model container [2019-11-07 01:27:25,408 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:27:25" (1/1) ... [2019-11-07 01:27:25,416 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-11-07 01:27:25,434 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-11-07 01:27:25,613 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-07 01:27:25,617 INFO L188 MainTranslator]: Completed pre-run [2019-11-07 01:27:25,637 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-07 01:27:25,657 INFO L192 MainTranslator]: Completed translation [2019-11-07 01:27:25,657 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:27:25 WrapperNode [2019-11-07 01:27:25,658 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-07 01:27:25,658 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-07 01:27:25,658 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-07 01:27:25,658 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-07 01:27:25,747 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:27:25" (1/1) ... [2019-11-07 01:27:25,747 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:27:25" (1/1) ... [2019-11-07 01:27:25,754 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:27:25" (1/1) ... [2019-11-07 01:27:25,754 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:27:25" (1/1) ... [2019-11-07 01:27:25,761 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:27:25" (1/1) ... [2019-11-07 01:27:25,767 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:27:25" (1/1) ... [2019-11-07 01:27:25,768 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:27:25" (1/1) ... [2019-11-07 01:27:25,770 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-07 01:27:25,771 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-07 01:27:25,771 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-07 01:27:25,771 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-07 01:27:25,772 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:27:25" (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 01:27:25,832 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-11-07 01:27:25,833 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-07 01:27:25,833 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-11-07 01:27:25,833 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-11-07 01:27:25,833 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-11-07 01:27:25,833 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-11-07 01:27:25,834 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-11-07 01:27:25,834 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-11-07 01:27:25,834 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-11-07 01:27:25,834 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-11-07 01:27:25,834 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-11-07 01:27:25,835 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-11-07 01:27:25,835 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-11-07 01:27:25,835 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-07 01:27:26,153 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-07 01:27:26,153 INFO L284 CfgBuilder]: Removed 3 assume(true) statements. [2019-11-07 01:27:26,155 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:27:26 BoogieIcfgContainer [2019-11-07 01:27:26,155 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-07 01:27:26,156 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-07 01:27:26,156 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-07 01:27:26,160 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-07 01:27:26,160 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 01:27:25" (1/3) ... [2019-11-07 01:27:26,161 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@61f97eb1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:27:26, skipping insertion in model container [2019-11-07 01:27:26,161 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:27:25" (2/3) ... [2019-11-07 01:27:26,162 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@61f97eb1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:27:26, skipping insertion in model container [2019-11-07 01:27:26,162 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:27:26" (3/3) ... [2019-11-07 01:27:26,164 INFO L109 eAbstractionObserver]: Analyzing ICFG standard_two_index_08.i [2019-11-07 01:27:26,175 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-07 01:27:26,183 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-07 01:27:26,196 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-07 01:27:26,221 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-07 01:27:26,221 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-07 01:27:26,221 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-07 01:27:26,222 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-07 01:27:26,222 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-07 01:27:26,224 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-07 01:27:26,224 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-07 01:27:26,224 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-07 01:27:26,243 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states. [2019-11-07 01:27:26,248 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2019-11-07 01:27:26,248 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:27:26,249 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:27:26,251 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:27:26,257 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:27:26,257 INFO L82 PathProgramCache]: Analyzing trace with hash 328370140, now seen corresponding path program 1 times [2019-11-07 01:27:26,268 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:27:26,268 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [38963116] [2019-11-07 01:27:26,269 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:27:26,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:27:26,434 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 01:27:26,435 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [38963116] [2019-11-07 01:27:26,436 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-07 01:27:26,436 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-07 01:27:26,437 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1554439568] [2019-11-07 01:27:26,442 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-07 01:27:26,442 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:27:26,460 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-07 01:27:26,460 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-07 01:27:26,463 INFO L87 Difference]: Start difference. First operand 19 states. Second operand 3 states. [2019-11-07 01:27:26,511 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:27:26,511 INFO L93 Difference]: Finished difference Result 33 states and 40 transitions. [2019-11-07 01:27:26,512 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-07 01:27:26,513 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 12 [2019-11-07 01:27:26,514 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:27:26,521 INFO L225 Difference]: With dead ends: 33 [2019-11-07 01:27:26,521 INFO L226 Difference]: Without dead ends: 17 [2019-11-07 01:27:26,525 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-07 01:27:26,540 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2019-11-07 01:27:26,558 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2019-11-07 01:27:26,560 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2019-11-07 01:27:26,561 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2019-11-07 01:27:26,563 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 12 [2019-11-07 01:27:26,563 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:27:26,564 INFO L462 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2019-11-07 01:27:26,564 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-07 01:27:26,564 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2019-11-07 01:27:26,565 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2019-11-07 01:27:26,565 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:27:26,565 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:27:26,566 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:27:26,566 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:27:26,567 INFO L82 PathProgramCache]: Analyzing trace with hash 1896737256, now seen corresponding path program 1 times [2019-11-07 01:27:26,567 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:27:26,567 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [380551862] [2019-11-07 01:27:26,568 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:27:26,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:27:26,615 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-07 01:27:26,616 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [380551862] [2019-11-07 01:27:26,616 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-07 01:27:26,617 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-07 01:27:26,617 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [786964168] [2019-11-07 01:27:26,619 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-07 01:27:26,619 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:27:26,620 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-07 01:27:26,620 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-07 01:27:26,620 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand 3 states. [2019-11-07 01:27:26,647 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:27:26,648 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2019-11-07 01:27:26,648 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-07 01:27:26,649 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 13 [2019-11-07 01:27:26,649 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:27:26,652 INFO L225 Difference]: With dead ends: 30 [2019-11-07 01:27:26,652 INFO L226 Difference]: Without dead ends: 21 [2019-11-07 01:27:26,653 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-07 01:27:26,654 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2019-11-07 01:27:26,663 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 18. [2019-11-07 01:27:26,663 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2019-11-07 01:27:26,664 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2019-11-07 01:27:26,665 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 13 [2019-11-07 01:27:26,665 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:27:26,665 INFO L462 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2019-11-07 01:27:26,665 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-07 01:27:26,666 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2019-11-07 01:27:26,666 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2019-11-07 01:27:26,666 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:27:26,667 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:27:26,667 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:27:26,667 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:27:26,668 INFO L82 PathProgramCache]: Analyzing trace with hash -1718311367, now seen corresponding path program 1 times [2019-11-07 01:27:26,668 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:27:26,668 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1329241648] [2019-11-07 01:27:26,669 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:27:26,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:27:26,796 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-07 01:27:26,797 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1329241648] [2019-11-07 01:27:26,797 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2015239753] [2019-11-07 01:27:26,797 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 01:27:26,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:27:26,853 INFO L256 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-07 01:27:26,859 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:27:26,910 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-07 01:27:26,911 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:27:26,942 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-07 01:27:26,943 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1056413542] [2019-11-07 01:27:26,969 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2019-11-07 01:27:26,969 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:27:26,974 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:27:26,980 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:27:26,980 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:27:27,108 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 01:27:27,528 WARN L191 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 49 DAG size of output: 44 [2019-11-07 01:27:27,622 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 32 for LOIs [2019-11-07 01:27:27,634 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 01:27:27,637 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:27:27,932 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:27:27,932 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 11] total 18 [2019-11-07 01:27:27,933 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1831448252] [2019-11-07 01:27:27,934 INFO L442 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-11-07 01:27:27,935 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:27:27,935 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-11-07 01:27:27,936 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=239, Unknown=0, NotChecked=0, Total=306 [2019-11-07 01:27:27,936 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 18 states. [2019-11-07 01:27:28,690 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:27:28,691 INFO L93 Difference]: Finished difference Result 50 states and 61 transitions. [2019-11-07 01:27:28,691 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2019-11-07 01:27:28,691 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 14 [2019-11-07 01:27:28,692 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:27:28,693 INFO L225 Difference]: With dead ends: 50 [2019-11-07 01:27:28,693 INFO L226 Difference]: Without dead ends: 39 [2019-11-07 01:27:28,694 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 283 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=234, Invalid=888, Unknown=0, NotChecked=0, Total=1122 [2019-11-07 01:27:28,695 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2019-11-07 01:27:28,707 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 24. [2019-11-07 01:27:28,707 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2019-11-07 01:27:28,709 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2019-11-07 01:27:28,709 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 14 [2019-11-07 01:27:28,710 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:27:28,711 INFO L462 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2019-11-07 01:27:28,711 INFO L463 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-11-07 01:27:28,711 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2019-11-07 01:27:28,712 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2019-11-07 01:27:28,712 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:27:28,713 INFO L410 BasicCegarLoop]: trace histogram [5, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:27:28,918 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:27:28,919 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:27:28,920 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:27:28,920 INFO L82 PathProgramCache]: Analyzing trace with hash -1363999975, now seen corresponding path program 2 times [2019-11-07 01:27:28,920 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:27:28,921 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1322921897] [2019-11-07 01:27:28,921 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:27:28,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:27:28,998 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2019-11-07 01:27:28,998 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1322921897] [2019-11-07 01:27:28,999 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1117088527] [2019-11-07 01:27:28,999 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 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 01:27:29,060 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-11-07 01:27:29,061 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 01:27:29,062 INFO L256 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 5 conjunts are in the unsatisfiable core [2019-11-07 01:27:29,064 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:27:29,076 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2019-11-07 01:27:29,076 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:27:29,119 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2019-11-07 01:27:29,119 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1830775288] [2019-11-07 01:27:29,121 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2019-11-07 01:27:29,121 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:27:29,121 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:27:29,122 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:27:29,122 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:27:29,155 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 01:27:29,461 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 32 for LOIs [2019-11-07 01:27:29,467 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 01:27:29,469 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:27:29,694 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:27:29,694 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 11] total 21 [2019-11-07 01:27:29,694 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [998053987] [2019-11-07 01:27:29,695 INFO L442 AbstractCegarLoop]: Interpolant automaton has 21 states [2019-11-07 01:27:29,695 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:27:29,696 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2019-11-07 01:27:29,696 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=317, Unknown=0, NotChecked=0, Total=420 [2019-11-07 01:27:29,696 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand 21 states. [2019-11-07 01:27:30,689 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:27:30,690 INFO L93 Difference]: Finished difference Result 73 states and 90 transitions. [2019-11-07 01:27:30,690 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2019-11-07 01:27:30,690 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 20 [2019-11-07 01:27:30,691 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:27:30,692 INFO L225 Difference]: With dead ends: 73 [2019-11-07 01:27:30,692 INFO L226 Difference]: Without dead ends: 60 [2019-11-07 01:27:30,693 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 512 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=436, Invalid=1456, Unknown=0, NotChecked=0, Total=1892 [2019-11-07 01:27:30,694 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2019-11-07 01:27:30,703 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 32. [2019-11-07 01:27:30,703 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2019-11-07 01:27:30,704 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2019-11-07 01:27:30,704 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 20 [2019-11-07 01:27:30,705 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:27:30,705 INFO L462 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2019-11-07 01:27:30,705 INFO L463 AbstractCegarLoop]: Interpolant automaton has 21 states. [2019-11-07 01:27:30,705 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2019-11-07 01:27:30,706 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2019-11-07 01:27:30,706 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:27:30,706 INFO L410 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:27:30,910 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:27:30,910 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:27:30,911 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:27:30,911 INFO L82 PathProgramCache]: Analyzing trace with hash 311824988, now seen corresponding path program 3 times [2019-11-07 01:27:30,911 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:27:30,911 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [315545373] [2019-11-07 01:27:30,912 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:27:30,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:27:31,046 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2019-11-07 01:27:31,046 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [315545373] [2019-11-07 01:27:31,047 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [552313528] [2019-11-07 01:27:31,047 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST 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 01:27:31,106 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-07 01:27:31,106 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 01:27:31,107 INFO L256 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 10 conjunts are in the unsatisfiable core [2019-11-07 01:27:31,109 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:27:31,176 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2019-11-07 01:27:31,177 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:27:31,293 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2019-11-07 01:27:31,293 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [463533448] [2019-11-07 01:27:31,295 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2019-11-07 01:27:31,295 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:27:31,296 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:27:31,296 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:27:31,297 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:27:31,322 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 01:27:31,649 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 32 for LOIs [2019-11-07 01:27:31,655 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 01:27:31,657 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:27:31,913 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:27:31,914 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11, 11] total 39 [2019-11-07 01:27:31,914 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [210850440] [2019-11-07 01:27:31,916 INFO L442 AbstractCegarLoop]: Interpolant automaton has 39 states [2019-11-07 01:27:31,916 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:27:31,916 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2019-11-07 01:27:31,918 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=487, Invalid=995, Unknown=0, NotChecked=0, Total=1482 [2019-11-07 01:27:31,918 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand 39 states. [2019-11-07 01:27:33,922 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:27:33,922 INFO L93 Difference]: Finished difference Result 108 states and 141 transitions. [2019-11-07 01:27:33,922 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2019-11-07 01:27:33,923 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 28 [2019-11-07 01:27:33,923 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:27:33,924 INFO L225 Difference]: With dead ends: 108 [2019-11-07 01:27:33,924 INFO L226 Difference]: Without dead ends: 90 [2019-11-07 01:27:33,928 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 58 SyntacticMatches, 0 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2179 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1816, Invalid=4990, Unknown=0, NotChecked=0, Total=6806 [2019-11-07 01:27:33,928 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2019-11-07 01:27:33,940 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 53. [2019-11-07 01:27:33,940 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2019-11-07 01:27:33,941 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 55 transitions. [2019-11-07 01:27:33,941 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 55 transitions. Word has length 28 [2019-11-07 01:27:33,942 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:27:33,942 INFO L462 AbstractCegarLoop]: Abstraction has 53 states and 55 transitions. [2019-11-07 01:27:33,942 INFO L463 AbstractCegarLoop]: Interpolant automaton has 39 states. [2019-11-07 01:27:33,942 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 55 transitions. [2019-11-07 01:27:33,943 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2019-11-07 01:27:33,943 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:27:33,944 INFO L410 BasicCegarLoop]: trace histogram [26, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:27:34,154 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:27:34,156 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:27:34,157 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:27:34,157 INFO L82 PathProgramCache]: Analyzing trace with hash -1394133595, now seen corresponding path program 4 times [2019-11-07 01:27:34,158 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:27:34,158 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1011130805] [2019-11-07 01:27:34,158 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:27:34,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:27:34,387 INFO L134 CoverageAnalysis]: Checked inductivity of 417 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 351 trivial. 0 not checked. [2019-11-07 01:27:34,388 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1011130805] [2019-11-07 01:27:34,388 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [93872668] [2019-11-07 01:27:34,388 INFO L92 rtionOrderModulation]: Changing assertion order to 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 01:27:34,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:27:34,478 INFO L256 TraceCheckSpWp]: Trace formula consists of 288 conjuncts, 28 conjunts are in the unsatisfiable core [2019-11-07 01:27:34,482 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:27:34,666 INFO L134 CoverageAnalysis]: Checked inductivity of 417 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2019-11-07 01:27:34,667 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:27:35,427 INFO L134 CoverageAnalysis]: Checked inductivity of 417 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2019-11-07 01:27:35,427 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1196283881] [2019-11-07 01:27:35,428 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2019-11-07 01:27:35,429 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:27:35,429 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:27:35,429 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:27:35,430 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:27:35,461 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 01:27:35,778 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 32 for LOIs [2019-11-07 01:27:35,790 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 01:27:35,794 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:27:36,042 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:27:36,043 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 29, 29, 11] total 75 [2019-11-07 01:27:36,043 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1945165751] [2019-11-07 01:27:36,044 INFO L442 AbstractCegarLoop]: Interpolant automaton has 75 states [2019-11-07 01:27:36,044 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:27:36,046 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2019-11-07 01:27:36,048 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2233, Invalid=3317, Unknown=0, NotChecked=0, Total=5550 [2019-11-07 01:27:36,048 INFO L87 Difference]: Start difference. First operand 53 states and 55 transitions. Second operand 75 states. [2019-11-07 01:27:40,805 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:27:40,805 INFO L93 Difference]: Finished difference Result 169 states and 228 transitions. [2019-11-07 01:27:40,805 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 91 states. [2019-11-07 01:27:40,806 INFO L78 Accepts]: Start accepts. Automaton has 75 states. Word has length 49 [2019-11-07 01:27:40,806 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:27:40,809 INFO L225 Difference]: With dead ends: 169 [2019-11-07 01:27:40,809 INFO L226 Difference]: Without dead ends: 148 [2019-11-07 01:27:40,819 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 247 GetRequests, 88 SyntacticMatches, 0 SemanticMatches, 159 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9281 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=7837, Invalid=17923, Unknown=0, NotChecked=0, Total=25760 [2019-11-07 01:27:40,820 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2019-11-07 01:27:40,857 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 94. [2019-11-07 01:27:40,857 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 94 states. [2019-11-07 01:27:40,866 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 96 transitions. [2019-11-07 01:27:40,866 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 96 transitions. Word has length 49 [2019-11-07 01:27:40,867 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:27:40,867 INFO L462 AbstractCegarLoop]: Abstraction has 94 states and 96 transitions. [2019-11-07 01:27:40,867 INFO L463 AbstractCegarLoop]: Interpolant automaton has 75 states. [2019-11-07 01:27:40,867 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 96 transitions. [2019-11-07 01:27:40,872 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2019-11-07 01:27:40,873 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:27:40,873 INFO L410 BasicCegarLoop]: trace histogram [62, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:27:41,085 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:27:41,087 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:27:41,088 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:27:41,088 INFO L82 PathProgramCache]: Analyzing trace with hash -1422778532, now seen corresponding path program 5 times [2019-11-07 01:27:41,088 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:27:41,088 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1489949507] [2019-11-07 01:27:41,089 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:27:41,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:27:41,435 INFO L134 CoverageAnalysis]: Checked inductivity of 2089 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 1953 trivial. 0 not checked. [2019-11-07 01:27:41,435 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1489949507] [2019-11-07 01:27:41,435 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1426718667] [2019-11-07 01:27:41,436 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 01:27:59,861 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2019-11-07 01:27:59,862 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 01:27:59,872 INFO L256 TraceCheckSpWp]: Trace formula consists of 258 conjuncts, 18 conjunts are in the unsatisfiable core [2019-11-07 01:27:59,877 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:27:59,900 INFO L134 CoverageAnalysis]: Checked inductivity of 2089 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 1953 trivial. 0 not checked. [2019-11-07 01:27:59,901 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:28:00,288 INFO L134 CoverageAnalysis]: Checked inductivity of 2089 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 1953 trivial. 0 not checked. [2019-11-07 01:28:00,288 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1993525952] [2019-11-07 01:28:00,289 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2019-11-07 01:28:00,289 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:28:00,290 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:28:00,290 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:28:00,290 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:28:00,307 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 01:28:00,514 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 32 for LOIs [2019-11-07 01:28:00,524 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 01:28:00,527 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:28:00,922 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:28:00,923 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19, 11] total 47 [2019-11-07 01:28:00,923 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [206094466] [2019-11-07 01:28:00,924 INFO L442 AbstractCegarLoop]: Interpolant automaton has 47 states [2019-11-07 01:28:00,925 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:28:00,925 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2019-11-07 01:28:00,932 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=766, Invalid=1396, Unknown=0, NotChecked=0, Total=2162 [2019-11-07 01:28:00,932 INFO L87 Difference]: Start difference. First operand 94 states and 96 transitions. Second operand 47 states. [2019-11-07 01:28:04,971 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:28:04,971 INFO L93 Difference]: Finished difference Result 227 states and 279 transitions. [2019-11-07 01:28:04,971 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 80 states. [2019-11-07 01:28:04,972 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 90 [2019-11-07 01:28:04,973 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:28:04,975 INFO L225 Difference]: With dead ends: 227 [2019-11-07 01:28:04,976 INFO L226 Difference]: Without dead ends: 218 [2019-11-07 01:28:04,980 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 364 GetRequests, 244 SyntacticMatches, 0 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4035 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=4206, Invalid=10556, Unknown=0, NotChecked=0, Total=14762 [2019-11-07 01:28:04,980 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 218 states. [2019-11-07 01:28:05,003 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 218 to 112. [2019-11-07 01:28:05,004 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 112 states. [2019-11-07 01:28:05,004 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 114 transitions. [2019-11-07 01:28:05,005 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 114 transitions. Word has length 90 [2019-11-07 01:28:05,005 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:28:05,005 INFO L462 AbstractCegarLoop]: Abstraction has 112 states and 114 transitions. [2019-11-07 01:28:05,005 INFO L463 AbstractCegarLoop]: Interpolant automaton has 47 states. [2019-11-07 01:28:05,005 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 114 transitions. [2019-11-07 01:28:05,007 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2019-11-07 01:28:05,007 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:28:05,007 INFO L410 BasicCegarLoop]: trace histogram [62, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:28:05,211 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:28:05,213 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:28:05,214 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:28:05,214 INFO L82 PathProgramCache]: Analyzing trace with hash 1547036028, now seen corresponding path program 6 times [2019-11-07 01:28:05,215 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:28:05,215 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1793796951] [2019-11-07 01:28:05,215 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:28:05,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:28:05,943 INFO L134 CoverageAnalysis]: Checked inductivity of 2548 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 1953 trivial. 0 not checked. [2019-11-07 01:28:05,944 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1793796951] [2019-11-07 01:28:05,944 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1775701434] [2019-11-07 01:28:05,944 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST 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 01:28:06,120 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-07 01:28:06,120 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 01:28:06,123 INFO L256 TraceCheckSpWp]: Trace formula consists of 642 conjuncts, 64 conjunts are in the unsatisfiable core [2019-11-07 01:28:06,129 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:28:06,612 INFO L134 CoverageAnalysis]: Checked inductivity of 2548 backedges. 0 proven. 1953 refuted. 0 times theorem prover too weak. 595 trivial. 0 not checked. [2019-11-07 01:28:06,612 INFO L321 TraceCheckSpWp]: Computing backward predicates...