/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-crafted/zero_sum_m2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-fb55353 [2019-11-07 01:19:22,724 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-07 01:19:22,726 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-07 01:19:22,745 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2019-11-07 01:19:22,768 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-07 01:19:22,769 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-07 01:19:22,770 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-07 01:19:22,772 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-07 01:19:22,772 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-07 01:19:22,773 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-07 01:19:22,775 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-07 01:19:22,777 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-07 01:19:22,778 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-07 01:19:22,779 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-07 01:19:22,784 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-07 01:19:22,784 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-07 01:19:22,790 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-11-07 01:19:22,806 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-07 01:19:22,807 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-07 01:19:22,808 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-07 01:19:22,810 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 01:19:22,833 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-07 01:19:22,833 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-07 01:19:22,835 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-07 01:19:22,835 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-07 01:19:22,835 INFO L138 SettingsManager]: * Use SBE=true [2019-11-07 01:19:22,835 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-07 01:19:22,836 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-07 01:19:22,836 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-07 01:19:22,836 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-07 01:19:22,836 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-07 01:19:22,837 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-07 01:19:22,838 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-07 01:19:22,838 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-07 01:19:22,838 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-07 01:19:22,839 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-07 01:19:22,839 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-07 01:19:22,839 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-07 01:19:22,839 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-07 01:19:22,839 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-07 01:19:22,840 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-07 01:19:22,840 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-07 01:19:22,840 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-07 01:19:22,841 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-07 01:19:22,841 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-07 01:19:22,841 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-07 01:19:22,841 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-07 01:19:22,841 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-07 01:19:22,842 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-07 01:19:22,842 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 01:19:23,120 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-07 01:19:23,133 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-07 01:19:23,136 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-07 01:19:23,138 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-07 01:19:23,138 INFO L275 PluginConnector]: CDTParser initialized [2019-11-07 01:19:23,139 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-crafted/zero_sum_m2.c [2019-11-07 01:19:23,213 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c4238c7e6/41fce9cb505a4eafa61bbf66cd992ba7/FLAG477f320ef [2019-11-07 01:19:23,666 INFO L306 CDTParser]: Found 1 translation units. [2019-11-07 01:19:23,667 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-crafted/zero_sum_m2.c [2019-11-07 01:19:23,676 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c4238c7e6/41fce9cb505a4eafa61bbf66cd992ba7/FLAG477f320ef [2019-11-07 01:19:24,046 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c4238c7e6/41fce9cb505a4eafa61bbf66cd992ba7 [2019-11-07 01:19:24,055 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-07 01:19:24,057 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-11-07 01:19:24,058 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-07 01:19:24,058 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-07 01:19:24,061 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-07 01:19:24,062 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:19:24" (1/1) ... [2019-11-07 01:19:24,064 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@25f9a9b4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:19:24, skipping insertion in model container [2019-11-07 01:19:24,065 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:19:24" (1/1) ... [2019-11-07 01:19:24,071 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-11-07 01:19:24,092 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-11-07 01:19:24,255 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-07 01:19:24,259 INFO L188 MainTranslator]: Completed pre-run [2019-11-07 01:19:24,282 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-07 01:19:24,378 INFO L192 MainTranslator]: Completed translation [2019-11-07 01:19:24,379 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:19:24 WrapperNode [2019-11-07 01:19:24,379 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-07 01:19:24,380 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-07 01:19:24,380 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-07 01:19:24,380 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-07 01:19:24,390 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:19:24" (1/1) ... [2019-11-07 01:19:24,391 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:19:24" (1/1) ... [2019-11-07 01:19:24,397 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:19:24" (1/1) ... [2019-11-07 01:19:24,397 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:19:24" (1/1) ... [2019-11-07 01:19:24,415 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:19:24" (1/1) ... [2019-11-07 01:19:24,423 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:19:24" (1/1) ... [2019-11-07 01:19:24,425 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:19:24" (1/1) ... [2019-11-07 01:19:24,427 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-07 01:19:24,427 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-07 01:19:24,427 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-07 01:19:24,428 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-07 01:19:24,431 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:19:24" (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 01:19:24,484 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-11-07 01:19:24,485 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-07 01:19:24,485 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-11-07 01:19:24,485 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-11-07 01:19:24,486 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-11-07 01:19:24,486 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assume [2019-11-07 01:19:24,486 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-11-07 01:19:24,486 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_short [2019-11-07 01:19:24,487 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-11-07 01:19:24,487 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-11-07 01:19:24,487 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-11-07 01:19:24,487 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-11-07 01:19:24,487 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-11-07 01:19:24,487 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-11-07 01:19:24,488 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-07 01:19:24,918 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-07 01:19:24,918 INFO L284 CfgBuilder]: Removed 5 assume(true) statements. [2019-11-07 01:19:24,920 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:19:24 BoogieIcfgContainer [2019-11-07 01:19:24,920 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-07 01:19:24,921 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-07 01:19:24,921 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-07 01:19:24,924 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-07 01:19:24,925 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 01:19:24" (1/3) ... [2019-11-07 01:19:24,926 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3045a66c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:19:24, skipping insertion in model container [2019-11-07 01:19:24,926 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:19:24" (2/3) ... [2019-11-07 01:19:24,926 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3045a66c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:19:24, skipping insertion in model container [2019-11-07 01:19:24,926 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:19:24" (3/3) ... [2019-11-07 01:19:24,928 INFO L109 eAbstractionObserver]: Analyzing ICFG zero_sum_m2.c [2019-11-07 01:19:24,939 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-07 01:19:24,948 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-07 01:19:24,959 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-07 01:19:24,984 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-07 01:19:24,984 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-07 01:19:24,984 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-07 01:19:24,984 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-07 01:19:24,985 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-07 01:19:24,985 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-07 01:19:24,985 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-07 01:19:24,986 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-07 01:19:25,003 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states. [2019-11-07 01:19:25,009 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-11-07 01:19:25,009 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:19:25,010 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:19:25,012 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:19:25,017 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:19:25,018 INFO L82 PathProgramCache]: Analyzing trace with hash -112684807, now seen corresponding path program 1 times [2019-11-07 01:19:25,026 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:19:25,026 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1318978530] [2019-11-07 01:19:25,027 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:19:25,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:19:25,222 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 01:19:25,223 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1318978530] [2019-11-07 01:19:25,224 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-07 01:19:25,225 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-11-07 01:19:25,225 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [631786088] [2019-11-07 01:19:25,231 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-11-07 01:19:25,231 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:19:25,246 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-11-07 01:19:25,247 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2019-11-07 01:19:25,249 INFO L87 Difference]: Start difference. First operand 23 states. Second operand 5 states. [2019-11-07 01:19:25,340 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:19:25,340 INFO L93 Difference]: Finished difference Result 44 states and 55 transitions. [2019-11-07 01:19:25,341 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-11-07 01:19:25,342 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 15 [2019-11-07 01:19:25,343 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:19:25,353 INFO L225 Difference]: With dead ends: 44 [2019-11-07 01:19:25,353 INFO L226 Difference]: Without dead ends: 20 [2019-11-07 01:19:25,357 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2019-11-07 01:19:25,377 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2019-11-07 01:19:25,396 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2019-11-07 01:19:25,398 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2019-11-07 01:19:25,399 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 27 transitions. [2019-11-07 01:19:25,401 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 27 transitions. Word has length 15 [2019-11-07 01:19:25,402 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:19:25,402 INFO L462 AbstractCegarLoop]: Abstraction has 20 states and 27 transitions. [2019-11-07 01:19:25,402 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-11-07 01:19:25,402 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 27 transitions. [2019-11-07 01:19:25,403 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-11-07 01:19:25,404 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:19:25,404 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:19:25,404 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:19:25,405 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:19:25,405 INFO L82 PathProgramCache]: Analyzing trace with hash -1049806191, now seen corresponding path program 1 times [2019-11-07 01:19:25,405 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:19:25,406 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1767691329] [2019-11-07 01:19:25,406 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:19:25,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:19:25,467 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 01:19:25,468 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1767691329] [2019-11-07 01:19:25,468 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-07 01:19:25,468 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-07 01:19:25,469 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [707783207] [2019-11-07 01:19:25,471 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-07 01:19:25,471 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:19:25,472 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-07 01:19:25,472 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-07 01:19:25,472 INFO L87 Difference]: Start difference. First operand 20 states and 27 transitions. Second operand 3 states. [2019-11-07 01:19:25,511 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:19:25,511 INFO L93 Difference]: Finished difference Result 34 states and 48 transitions. [2019-11-07 01:19:25,512 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-07 01:19:25,512 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 16 [2019-11-07 01:19:25,512 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:19:25,513 INFO L225 Difference]: With dead ends: 34 [2019-11-07 01:19:25,513 INFO L226 Difference]: Without dead ends: 21 [2019-11-07 01:19:25,515 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 01:19:25,515 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2019-11-07 01:19:25,520 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2019-11-07 01:19:25,521 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2019-11-07 01:19:25,522 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 28 transitions. [2019-11-07 01:19:25,522 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 28 transitions. Word has length 16 [2019-11-07 01:19:25,522 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:19:25,523 INFO L462 AbstractCegarLoop]: Abstraction has 21 states and 28 transitions. [2019-11-07 01:19:25,523 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-07 01:19:25,523 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 28 transitions. [2019-11-07 01:19:25,524 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2019-11-07 01:19:25,524 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:19:25,524 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:19:25,525 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:19:25,525 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:19:25,525 INFO L82 PathProgramCache]: Analyzing trace with hash 2044317511, now seen corresponding path program 1 times [2019-11-07 01:19:25,526 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:19:25,526 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [476683850] [2019-11-07 01:19:25,526 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:19:25,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:19:25,625 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-07 01:19:25,626 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [476683850] [2019-11-07 01:19:25,626 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-07 01:19:25,627 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-11-07 01:19:25,627 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [264477269] [2019-11-07 01:19:25,627 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-07 01:19:25,628 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:19:25,628 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-07 01:19:25,628 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-11-07 01:19:25,629 INFO L87 Difference]: Start difference. First operand 21 states and 28 transitions. Second operand 4 states. [2019-11-07 01:19:25,703 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:19:25,704 INFO L93 Difference]: Finished difference Result 32 states and 44 transitions. [2019-11-07 01:19:25,705 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-07 01:19:25,705 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 17 [2019-11-07 01:19:25,705 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:19:25,706 INFO L225 Difference]: With dead ends: 32 [2019-11-07 01:19:25,706 INFO L226 Difference]: Without dead ends: 21 [2019-11-07 01:19:25,707 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-11-07 01:19:25,708 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2019-11-07 01:19:25,716 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2019-11-07 01:19:25,721 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2019-11-07 01:19:25,723 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2019-11-07 01:19:25,723 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 17 [2019-11-07 01:19:25,723 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:19:25,724 INFO L462 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2019-11-07 01:19:25,724 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-07 01:19:25,724 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2019-11-07 01:19:25,725 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2019-11-07 01:19:25,726 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:19:25,726 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:19:25,726 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:19:25,726 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:19:25,727 INFO L82 PathProgramCache]: Analyzing trace with hash 1165736995, now seen corresponding path program 1 times [2019-11-07 01:19:25,727 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:19:25,727 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1857389] [2019-11-07 01:19:25,727 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:19:25,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:19:25,826 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-11-07 01:19:25,827 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1857389] [2019-11-07 01:19:25,827 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [603636143] [2019-11-07 01:19:25,828 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 01:19:25,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:19:25,916 INFO L256 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 4 conjunts are in the unsatisfiable core [2019-11-07 01:19:25,925 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:19:25,983 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-11-07 01:19:25,983 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:19:26,032 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-11-07 01:19:26,033 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1926852394] [2019-11-07 01:19:26,061 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2019-11-07 01:19:26,061 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:19:26,068 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:19:26,075 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:19:26,076 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:19:26,238 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 25 for LOIs [2019-11-07 01:19:26,502 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2019-11-07 01:19:26,508 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2019-11-07 01:19:26,510 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:19:26,817 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:19:26,817 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4, 4, 11] total 19 [2019-11-07 01:19:26,818 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1400333520] [2019-11-07 01:19:26,819 INFO L442 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-11-07 01:19:26,820 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:19:26,820 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-11-07 01:19:26,821 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=289, Unknown=0, NotChecked=0, Total=342 [2019-11-07 01:19:26,821 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 19 states. [2019-11-07 01:19:27,250 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:19:27,250 INFO L93 Difference]: Finished difference Result 39 states and 51 transitions. [2019-11-07 01:19:27,251 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-11-07 01:19:27,251 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 20 [2019-11-07 01:19:27,252 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:19:27,252 INFO L225 Difference]: With dead ends: 39 [2019-11-07 01:19:27,252 INFO L226 Difference]: Without dead ends: 26 [2019-11-07 01:19:27,254 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 153 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=99, Invalid=551, Unknown=0, NotChecked=0, Total=650 [2019-11-07 01:19:27,254 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2019-11-07 01:19:27,264 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2019-11-07 01:19:27,264 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2019-11-07 01:19:27,267 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 30 transitions. [2019-11-07 01:19:27,268 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 30 transitions. Word has length 20 [2019-11-07 01:19:27,268 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:19:27,268 INFO L462 AbstractCegarLoop]: Abstraction has 26 states and 30 transitions. [2019-11-07 01:19:27,269 INFO L463 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-11-07 01:19:27,269 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 30 transitions. [2019-11-07 01:19:27,269 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2019-11-07 01:19:27,272 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:19:27,274 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:19:27,480 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:19:27,481 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:19:27,481 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:19:27,482 INFO L82 PathProgramCache]: Analyzing trace with hash 513164793, now seen corresponding path program 2 times [2019-11-07 01:19:27,482 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:19:27,483 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1421245234] [2019-11-07 01:19:27,483 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:19:27,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:19:28,238 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 01:19:28,239 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1421245234] [2019-11-07 01:19:28,239 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2077778071] [2019-11-07 01:19:28,239 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 01:19:28,301 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2019-11-07 01:19:28,301 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 01:19:28,303 INFO L256 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 50 conjunts are in the unsatisfiable core [2019-11-07 01:19:28,306 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:19:29,131 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-07 01:19:29,132 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:19:30,516 WARN L191 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 56 DAG size of output: 41 [2019-11-07 01:19:30,786 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-11-07 01:19:30,788 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [358380351] [2019-11-07 01:19:30,794 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2019-11-07 01:19:30,794 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:19:30,796 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:19:30,797 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:19:30,797 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:19:30,863 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 25 for LOIs [2019-11-07 01:19:31,084 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2019-11-07 01:19:31,089 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2019-11-07 01:19:31,091 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:19:31,747 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:19:31,747 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 19, 18, 11] total 56 [2019-11-07 01:19:31,748 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1732051048] [2019-11-07 01:19:31,749 INFO L442 AbstractCegarLoop]: Interpolant automaton has 56 states [2019-11-07 01:19:31,749 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:19:31,750 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2019-11-07 01:19:31,752 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=214, Invalid=2866, Unknown=0, NotChecked=0, Total=3080 [2019-11-07 01:19:31,752 INFO L87 Difference]: Start difference. First operand 26 states and 30 transitions. Second operand 56 states. [2019-11-07 01:19:33,627 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:19:33,627 INFO L93 Difference]: Finished difference Result 41 states and 48 transitions. [2019-11-07 01:19:33,628 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2019-11-07 01:19:33,628 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 25 [2019-11-07 01:19:33,629 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:19:33,630 INFO L225 Difference]: With dead ends: 41 [2019-11-07 01:19:33,630 INFO L226 Difference]: Without dead ends: 36 [2019-11-07 01:19:33,633 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 35 SyntacticMatches, 4 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1279 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=335, Invalid=4495, Unknown=0, NotChecked=0, Total=4830 [2019-11-07 01:19:33,633 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2019-11-07 01:19:33,639 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 34. [2019-11-07 01:19:33,640 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2019-11-07 01:19:33,641 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 41 transitions. [2019-11-07 01:19:33,641 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 41 transitions. Word has length 25 [2019-11-07 01:19:33,641 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:19:33,642 INFO L462 AbstractCegarLoop]: Abstraction has 34 states and 41 transitions. [2019-11-07 01:19:33,642 INFO L463 AbstractCegarLoop]: Interpolant automaton has 56 states. [2019-11-07 01:19:33,642 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 41 transitions. [2019-11-07 01:19:33,643 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2019-11-07 01:19:33,643 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:19:33,643 INFO L410 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:19:33,846 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:19:33,847 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:19:33,847 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:19:33,847 INFO L82 PathProgramCache]: Analyzing trace with hash -609919663, now seen corresponding path program 3 times [2019-11-07 01:19:33,848 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:19:33,848 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1518750965] [2019-11-07 01:19:33,849 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:19:33,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:19:33,945 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-11-07 01:19:33,946 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1518750965] [2019-11-07 01:19:33,946 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1535927180] [2019-11-07 01:19:33,946 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 01:19:34,010 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-07 01:19:34,011 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 01:19:34,012 INFO L256 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 8 conjunts are in the unsatisfiable core [2019-11-07 01:19:34,020 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:19:34,088 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-11-07 01:19:34,089 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:19:34,143 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-11-07 01:19:34,144 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2007497985] [2019-11-07 01:19:34,146 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2019-11-07 01:19:34,148 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:19:34,149 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:19:34,149 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:19:34,150 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:19:34,212 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 25 for LOIs [2019-11-07 01:19:34,347 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2019-11-07 01:19:34,352 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2019-11-07 01:19:34,355 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:19:34,628 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:19:34,628 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 11] total 24 [2019-11-07 01:19:34,629 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1039355771] [2019-11-07 01:19:34,630 INFO L442 AbstractCegarLoop]: Interpolant automaton has 24 states [2019-11-07 01:19:34,630 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:19:34,631 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2019-11-07 01:19:34,631 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=459, Unknown=0, NotChecked=0, Total=552 [2019-11-07 01:19:34,631 INFO L87 Difference]: Start difference. First operand 34 states and 41 transitions. Second operand 24 states. [2019-11-07 01:19:35,137 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:19:35,137 INFO L93 Difference]: Finished difference Result 63 states and 76 transitions. [2019-11-07 01:19:35,137 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2019-11-07 01:19:35,137 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 26 [2019-11-07 01:19:35,138 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:19:35,144 INFO L225 Difference]: With dead ends: 63 [2019-11-07 01:19:35,147 INFO L226 Difference]: Without dead ends: 42 [2019-11-07 01:19:35,148 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 59 SyntacticMatches, 5 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 380 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=197, Invalid=1063, Unknown=0, NotChecked=0, Total=1260 [2019-11-07 01:19:35,148 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2019-11-07 01:19:35,157 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 35. [2019-11-07 01:19:35,158 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2019-11-07 01:19:35,161 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 41 transitions. [2019-11-07 01:19:35,161 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 41 transitions. Word has length 26 [2019-11-07 01:19:35,162 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:19:35,162 INFO L462 AbstractCegarLoop]: Abstraction has 35 states and 41 transitions. [2019-11-07 01:19:35,162 INFO L463 AbstractCegarLoop]: Interpolant automaton has 24 states. [2019-11-07 01:19:35,162 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 41 transitions. [2019-11-07 01:19:35,162 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2019-11-07 01:19:35,162 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:19:35,163 INFO L410 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:19:35,374 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:19:35,375 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:19:35,375 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:19:35,375 INFO L82 PathProgramCache]: Analyzing trace with hash 63235344, now seen corresponding path program 4 times [2019-11-07 01:19:35,375 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:19:35,376 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1403416435] [2019-11-07 01:19:35,376 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:19:35,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:19:35,435 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-11-07 01:19:35,436 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1403416435] [2019-11-07 01:19:35,436 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [606624868] [2019-11-07 01:19:35,436 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 01:19:35,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:19:35,507 INFO L256 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 8 conjunts are in the unsatisfiable core [2019-11-07 01:19:35,509 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:19:35,549 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-11-07 01:19:35,549 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:19:35,589 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-11-07 01:19:35,589 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1944029923] [2019-11-07 01:19:35,591 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2019-11-07 01:19:35,591 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:19:35,591 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:19:35,592 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:19:35,592 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:19:35,611 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 27 for LOIs [2019-11-07 01:19:35,746 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2019-11-07 01:19:35,750 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2019-11-07 01:19:35,751 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:19:36,027 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:19:36,028 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 11] total 23 [2019-11-07 01:19:36,028 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1363946976] [2019-11-07 01:19:36,029 INFO L442 AbstractCegarLoop]: Interpolant automaton has 23 states [2019-11-07 01:19:36,030 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:19:36,030 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2019-11-07 01:19:36,030 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=427, Unknown=0, NotChecked=0, Total=506 [2019-11-07 01:19:36,030 INFO L87 Difference]: Start difference. First operand 35 states and 41 transitions. Second operand 23 states. [2019-11-07 01:19:36,365 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:19:36,365 INFO L93 Difference]: Finished difference Result 62 states and 74 transitions. [2019-11-07 01:19:36,365 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-11-07 01:19:36,366 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 26 [2019-11-07 01:19:36,366 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:19:36,367 INFO L225 Difference]: With dead ends: 62 [2019-11-07 01:19:36,367 INFO L226 Difference]: Without dead ends: 36 [2019-11-07 01:19:36,368 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 60 SyntacticMatches, 4 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 223 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=131, Invalid=739, Unknown=0, NotChecked=0, Total=870 [2019-11-07 01:19:36,369 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2019-11-07 01:19:36,375 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2019-11-07 01:19:36,375 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2019-11-07 01:19:36,376 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 42 transitions. [2019-11-07 01:19:36,376 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 42 transitions. Word has length 26 [2019-11-07 01:19:36,377 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:19:36,377 INFO L462 AbstractCegarLoop]: Abstraction has 36 states and 42 transitions. [2019-11-07 01:19:36,377 INFO L463 AbstractCegarLoop]: Interpolant automaton has 23 states. [2019-11-07 01:19:36,377 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 42 transitions. [2019-11-07 01:19:36,378 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2019-11-07 01:19:36,378 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:19:36,378 INFO L410 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:19:36,582 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:19:36,582 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:19:36,583 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:19:36,583 INFO L82 PathProgramCache]: Analyzing trace with hash 924814918, now seen corresponding path program 5 times [2019-11-07 01:19:36,583 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:19:36,584 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [893057839] [2019-11-07 01:19:36,584 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:19:36,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:19:36,652 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2019-11-07 01:19:36,653 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [893057839] [2019-11-07 01:19:36,653 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1838098263] [2019-11-07 01:19:36,653 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 01:19:36,725 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-11-07 01:19:36,725 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 01:19:36,726 INFO L256 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 8 conjunts are in the unsatisfiable core [2019-11-07 01:19:36,728 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:19:36,786 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2019-11-07 01:19:36,786 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:19:36,856 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2019-11-07 01:19:36,857 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [579993188] [2019-11-07 01:19:36,858 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2019-11-07 01:19:36,858 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:19:36,859 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:19:36,859 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:19:36,860 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:19:36,884 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 25 for LOIs [2019-11-07 01:19:37,009 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2019-11-07 01:19:37,013 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2019-11-07 01:19:37,015 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:19:37,316 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:19:37,317 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 11] total 26 [2019-11-07 01:19:37,317 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [484502499] [2019-11-07 01:19:37,318 INFO L442 AbstractCegarLoop]: Interpolant automaton has 26 states [2019-11-07 01:19:37,318 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:19:37,318 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2019-11-07 01:19:37,318 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=562, Unknown=0, NotChecked=0, Total=650 [2019-11-07 01:19:37,319 INFO L87 Difference]: Start difference. First operand 36 states and 42 transitions. Second operand 26 states. [2019-11-07 01:19:37,852 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:19:37,852 INFO L93 Difference]: Finished difference Result 42 states and 48 transitions. [2019-11-07 01:19:37,852 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2019-11-07 01:19:37,853 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 27 [2019-11-07 01:19:37,853 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:19:37,853 INFO L225 Difference]: With dead ends: 42 [2019-11-07 01:19:37,855 INFO L226 Difference]: Without dead ends: 31 [2019-11-07 01:19:37,856 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 59 SyntacticMatches, 6 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 380 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=186, Invalid=1074, Unknown=0, NotChecked=0, Total=1260 [2019-11-07 01:19:37,857 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2019-11-07 01:19:37,864 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2019-11-07 01:19:37,864 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2019-11-07 01:19:37,866 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 35 transitions. [2019-11-07 01:19:37,867 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 35 transitions. Word has length 27 [2019-11-07 01:19:37,868 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:19:37,868 INFO L462 AbstractCegarLoop]: Abstraction has 31 states and 35 transitions. [2019-11-07 01:19:37,868 INFO L463 AbstractCegarLoop]: Interpolant automaton has 26 states. [2019-11-07 01:19:37,868 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 35 transitions. [2019-11-07 01:19:37,869 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2019-11-07 01:19:37,869 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:19:37,869 INFO L410 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:19:38,072 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:19:38,073 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:19:38,073 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:19:38,074 INFO L82 PathProgramCache]: Analyzing trace with hash -902503389, now seen corresponding path program 6 times [2019-11-07 01:19:38,074 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:19:38,074 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [125286298] [2019-11-07 01:19:38,074 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:19:38,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:19:38,549 WARN L191 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 56 DAG size of output: 26 [2019-11-07 01:19:38,665 WARN L191 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 29 [2019-11-07 01:19:38,786 WARN L191 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 44 DAG size of output: 26 [2019-11-07 01:19:38,941 WARN L191 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 64 DAG size of output: 34 [2019-11-07 01:19:39,856 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 1 proven. 29 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 01:19:39,856 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [125286298] [2019-11-07 01:19:39,856 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [903922345] [2019-11-07 01:19:39,857 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 01:19:39,927 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-07 01:19:39,927 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 01:19:39,929 INFO L256 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 58 conjunts are in the unsatisfiable core [2019-11-07 01:19:39,931 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:19:40,618 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-11-07 01:19:40,618 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:19:41,618 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-11-07 01:19:41,618 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1154056292] [2019-11-07 01:19:41,619 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2019-11-07 01:19:41,620 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:19:41,620 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:19:41,620 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:19:41,621 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:19:41,663 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 27 for LOIs [2019-11-07 01:19:41,785 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2019-11-07 01:19:41,788 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2019-11-07 01:19:41,790 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:19:42,410 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:19:42,410 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 19, 19, 11] total 64 [2019-11-07 01:19:42,411 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [640676893] [2019-11-07 01:19:42,412 INFO L442 AbstractCegarLoop]: Interpolant automaton has 64 states [2019-11-07 01:19:42,412 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:19:42,412 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2019-11-07 01:19:42,414 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=224, Invalid=3808, Unknown=0, NotChecked=0, Total=4032 [2019-11-07 01:19:42,414 INFO L87 Difference]: Start difference. First operand 31 states and 35 transitions. Second operand 64 states. [2019-11-07 01:19:44,662 WARN L191 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 55 DAG size of output: 54 [2019-11-07 01:19:45,952 WARN L191 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 52 [2019-11-07 01:19:47,178 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:19:47,179 INFO L93 Difference]: Finished difference Result 88 states and 108 transitions. [2019-11-07 01:19:47,179 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2019-11-07 01:19:47,179 INFO L78 Accepts]: Start accepts. Automaton has 64 states. Word has length 30 [2019-11-07 01:19:47,179 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:19:47,182 INFO L225 Difference]: With dead ends: 88 [2019-11-07 01:19:47,182 INFO L226 Difference]: Without dead ends: 66 [2019-11-07 01:19:47,185 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 49 SyntacticMatches, 3 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2732 ImplicationChecksByTransitivity, 6.7s TimeCoverageRelationStatistics Valid=666, Invalid=9434, Unknown=0, NotChecked=0, Total=10100 [2019-11-07 01:19:47,186 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2019-11-07 01:19:47,196 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 51. [2019-11-07 01:19:47,196 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2019-11-07 01:19:47,197 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 61 transitions. [2019-11-07 01:19:47,198 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 61 transitions. Word has length 30 [2019-11-07 01:19:47,198 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:19:47,198 INFO L462 AbstractCegarLoop]: Abstraction has 51 states and 61 transitions. [2019-11-07 01:19:47,198 INFO L463 AbstractCegarLoop]: Interpolant automaton has 64 states. [2019-11-07 01:19:47,198 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 61 transitions. [2019-11-07 01:19:47,199 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2019-11-07 01:19:47,199 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:19:47,199 INFO L410 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:19:47,403 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:19:47,404 INFO L410 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:19:47,404 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:19:47,404 INFO L82 PathProgramCache]: Analyzing trace with hash 1924146806, now seen corresponding path program 7 times [2019-11-07 01:19:47,405 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:19:47,405 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [174170325] [2019-11-07 01:19:47,405 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:19:47,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:19:47,476 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 7 proven. 9 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2019-11-07 01:19:47,477 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [174170325] [2019-11-07 01:19:47,477 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [441890898] [2019-11-07 01:19:47,477 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 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 01:19:47,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:19:47,546 INFO L256 TraceCheckSpWp]: Trace formula consists of 158 conjuncts, 10 conjunts are in the unsatisfiable core [2019-11-07 01:19:47,548 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:19:47,664 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2019-11-07 01:19:47,664 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:19:47,736 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2019-11-07 01:19:47,736 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1490636304] [2019-11-07 01:19:47,740 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2019-11-07 01:19:47,740 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:19:47,741 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:19:47,741 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:19:47,741 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:19:47,762 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 27 for LOIs [2019-11-07 01:19:47,846 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2019-11-07 01:19:47,872 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2019-11-07 01:19:47,873 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:19:48,295 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:19:48,295 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11, 11] total 30 [2019-11-07 01:19:48,296 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [736257331] [2019-11-07 01:19:48,298 INFO L442 AbstractCegarLoop]: Interpolant automaton has 30 states [2019-11-07 01:19:48,298 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:19:48,298 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2019-11-07 01:19:48,299 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=124, Invalid=746, Unknown=0, NotChecked=0, Total=870 [2019-11-07 01:19:48,299 INFO L87 Difference]: Start difference. First operand 51 states and 61 transitions. Second operand 30 states. [2019-11-07 01:19:49,233 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:19:49,234 INFO L93 Difference]: Finished difference Result 94 states and 111 transitions. [2019-11-07 01:19:49,234 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2019-11-07 01:19:49,234 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 31 [2019-11-07 01:19:49,235 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:19:49,235 INFO L225 Difference]: With dead ends: 94 [2019-11-07 01:19:49,235 INFO L226 Difference]: Without dead ends: 46 [2019-11-07 01:19:49,239 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 68 SyntacticMatches, 7 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 662 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=322, Invalid=1934, Unknown=0, NotChecked=0, Total=2256 [2019-11-07 01:19:49,239 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2019-11-07 01:19:49,249 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 39. [2019-11-07 01:19:49,250 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2019-11-07 01:19:49,252 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 44 transitions. [2019-11-07 01:19:49,253 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 44 transitions. Word has length 31 [2019-11-07 01:19:49,253 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:19:49,253 INFO L462 AbstractCegarLoop]: Abstraction has 39 states and 44 transitions. [2019-11-07 01:19:49,253 INFO L463 AbstractCegarLoop]: Interpolant automaton has 30 states. [2019-11-07 01:19:49,254 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 44 transitions. [2019-11-07 01:19:49,256 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2019-11-07 01:19:49,256 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:19:49,256 INFO L410 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:19:49,461 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:19:49,461 INFO L410 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:19:49,461 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:19:49,461 INFO L82 PathProgramCache]: Analyzing trace with hash 2021025832, now seen corresponding path program 8 times [2019-11-07 01:19:49,461 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:19:49,462 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [863644423] [2019-11-07 01:19:49,462 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:19:49,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:19:49,612 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 3 proven. 13 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2019-11-07 01:19:49,613 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [863644423] [2019-11-07 01:19:49,613 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1709711522] [2019-11-07 01:19:49,613 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 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:19:49,697 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-11-07 01:19:49,698 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 01:19:49,699 INFO L256 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 10 conjunts are in the unsatisfiable core [2019-11-07 01:19:49,700 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:19:49,756 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2019-11-07 01:19:49,756 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:19:49,800 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2019-11-07 01:19:49,800 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [978560589] [2019-11-07 01:19:49,801 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2019-11-07 01:19:49,801 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:19:49,801 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:19:49,802 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:19:49,802 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:19:49,833 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 27 for LOIs [2019-11-07 01:19:49,925 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2019-11-07 01:19:49,928 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2019-11-07 01:19:49,929 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:19:50,189 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:19:50,189 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11, 11] total 26 [2019-11-07 01:19:50,190 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [849532096] [2019-11-07 01:19:50,190 INFO L442 AbstractCegarLoop]: Interpolant automaton has 26 states [2019-11-07 01:19:50,191 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:19:50,191 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2019-11-07 01:19:50,192 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=549, Unknown=0, NotChecked=0, Total=650 [2019-11-07 01:19:50,192 INFO L87 Difference]: Start difference. First operand 39 states and 44 transitions. Second operand 26 states. [2019-11-07 01:19:50,761 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:19:50,761 INFO L93 Difference]: Finished difference Result 45 states and 50 transitions. [2019-11-07 01:19:50,762 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2019-11-07 01:19:50,762 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 33 [2019-11-07 01:19:50,762 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:19:50,763 INFO L225 Difference]: With dead ends: 45 [2019-11-07 01:19:50,763 INFO L226 Difference]: Without dead ends: 36 [2019-11-07 01:19:50,764 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 78 SyntacticMatches, 8 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 411 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=176, Invalid=1014, Unknown=0, NotChecked=0, Total=1190 [2019-11-07 01:19:50,764 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2019-11-07 01:19:50,772 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2019-11-07 01:19:50,772 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2019-11-07 01:19:50,774 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 40 transitions. [2019-11-07 01:19:50,775 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 40 transitions. Word has length 33 [2019-11-07 01:19:50,775 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:19:50,775 INFO L462 AbstractCegarLoop]: Abstraction has 36 states and 40 transitions. [2019-11-07 01:19:50,775 INFO L463 AbstractCegarLoop]: Interpolant automaton has 26 states. [2019-11-07 01:19:50,775 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 40 transitions. [2019-11-07 01:19:50,778 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2019-11-07 01:19:50,778 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:19:50,778 INFO L410 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:19:50,982 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:19:50,982 INFO L410 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:19:50,982 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:19:50,982 INFO L82 PathProgramCache]: Analyzing trace with hash -1919390983, now seen corresponding path program 9 times [2019-11-07 01:19:50,983 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:19:50,983 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [184035968] [2019-11-07 01:19:50,983 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:19:51,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:19:51,553 WARN L191 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 56 DAG size of output: 25 [2019-11-07 01:19:51,717 WARN L191 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 59 DAG size of output: 27 [2019-11-07 01:19:51,862 WARN L191 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 57 DAG size of output: 31 [2019-11-07 01:19:52,112 WARN L191 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 37 [2019-11-07 01:19:52,272 WARN L191 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 67 DAG size of output: 46 [2019-11-07 01:19:52,413 WARN L191 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 46 [2019-11-07 01:19:52,568 WARN L191 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 41 [2019-11-07 01:19:52,712 WARN L191 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 38 [2019-11-07 01:19:52,847 WARN L191 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 38 [2019-11-07 01:19:53,791 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 1 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 01:19:53,792 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [184035968] [2019-11-07 01:19:53,792 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1347780229] [2019-11-07 01:19:53,792 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 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:19:53,875 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-07 01:19:53,875 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 01:19:53,877 INFO L256 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 74 conjunts are in the unsatisfiable core [2019-11-07 01:19:53,880 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:19:54,813 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-11-07 01:19:54,813 INFO L321 TraceCheckSpWp]: Computing backward predicates...