/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_const4.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-fb55353 [2019-11-07 01:18:39,890 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-07 01:18:39,893 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-07 01:18:39,905 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2019-11-07 01:18:39,915 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-07 01:18:39,916 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-07 01:18:39,917 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-07 01:18:39,918 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-07 01:18:39,919 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-07 01:18:39,922 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-07 01:18:39,924 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-07 01:18:39,927 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-07 01:18:39,930 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-07 01:18:39,932 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-07 01:18:39,934 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-07 01:18:39,936 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-07 01:18:39,938 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-11-07 01:18:39,952 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-07 01:18:39,955 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-07 01:18:39,956 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-07 01:18:39,957 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 01:18:39,980 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-07 01:18:39,980 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-07 01:18:39,982 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-07 01:18:39,982 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-07 01:18:39,982 INFO L138 SettingsManager]: * Use SBE=true [2019-11-07 01:18:39,983 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-07 01:18:39,983 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-07 01:18:39,983 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-07 01:18:39,983 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-07 01:18:39,983 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-07 01:18:39,985 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-07 01:18:39,985 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-07 01:18:39,985 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-07 01:18:39,985 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-07 01:18:39,986 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-07 01:18:39,986 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-07 01:18:39,986 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-07 01:18:39,986 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-07 01:18:39,986 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-07 01:18:39,987 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-07 01:18:39,987 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-07 01:18:39,987 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-07 01:18:39,987 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-07 01:18:39,987 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-07 01:18:39,988 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-07 01:18:39,988 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-07 01:18:39,988 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-07 01:18:39,988 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-07 01:18:39,988 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 01:18:40,263 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-07 01:18:40,279 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-07 01:18:40,283 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-07 01:18:40,284 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-07 01:18:40,285 INFO L275 PluginConnector]: CDTParser initialized [2019-11-07 01:18:40,285 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-crafted/zero_sum_const4.c [2019-11-07 01:18:40,363 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a39163959/506d9e0974b74bb6866e393a025cc192/FLAG790d86d54 [2019-11-07 01:18:40,841 INFO L306 CDTParser]: Found 1 translation units. [2019-11-07 01:18:40,842 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-crafted/zero_sum_const4.c [2019-11-07 01:18:40,850 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a39163959/506d9e0974b74bb6866e393a025cc192/FLAG790d86d54 [2019-11-07 01:18:41,200 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a39163959/506d9e0974b74bb6866e393a025cc192 [2019-11-07 01:18:41,208 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-07 01:18:41,210 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-11-07 01:18:41,211 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-07 01:18:41,211 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-07 01:18:41,215 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-07 01:18:41,216 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:18:41" (1/1) ... [2019-11-07 01:18:41,219 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4ecbb40f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:18:41, skipping insertion in model container [2019-11-07 01:18:41,219 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:18:41" (1/1) ... [2019-11-07 01:18:41,226 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-11-07 01:18:41,250 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-11-07 01:18:41,435 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-07 01:18:41,447 INFO L188 MainTranslator]: Completed pre-run [2019-11-07 01:18:41,549 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-07 01:18:41,564 INFO L192 MainTranslator]: Completed translation [2019-11-07 01:18:41,564 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:18:41 WrapperNode [2019-11-07 01:18:41,564 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-07 01:18:41,565 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-07 01:18:41,565 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-07 01:18:41,565 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-07 01:18:41,576 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:18:41" (1/1) ... [2019-11-07 01:18:41,576 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:18:41" (1/1) ... [2019-11-07 01:18:41,585 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:18:41" (1/1) ... [2019-11-07 01:18:41,586 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:18:41" (1/1) ... [2019-11-07 01:18:41,595 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:18:41" (1/1) ... [2019-11-07 01:18:41,603 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:18:41" (1/1) ... [2019-11-07 01:18:41,606 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:18:41" (1/1) ... [2019-11-07 01:18:41,609 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-07 01:18:41,610 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-07 01:18:41,610 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-07 01:18:41,610 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-07 01:18:41,611 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:18:41" (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 01:18:41,659 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-11-07 01:18:41,659 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-07 01:18:41,659 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-11-07 01:18:41,660 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-11-07 01:18:41,660 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-11-07 01:18:41,660 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assume [2019-11-07 01:18:41,660 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-11-07 01:18:41,660 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_long [2019-11-07 01:18:41,660 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2019-11-07 01:18:41,661 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-11-07 01:18:41,661 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2019-11-07 01:18:41,661 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-11-07 01:18:41,661 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-11-07 01:18:41,661 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-11-07 01:18:41,661 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-07 01:18:41,662 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-11-07 01:18:42,208 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-07 01:18:42,209 INFO L284 CfgBuilder]: Removed 9 assume(true) statements. [2019-11-07 01:18:42,210 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:18:42 BoogieIcfgContainer [2019-11-07 01:18:42,210 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-07 01:18:42,211 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-07 01:18:42,211 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-07 01:18:42,215 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-07 01:18:42,215 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 01:18:41" (1/3) ... [2019-11-07 01:18:42,216 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@175c7b48 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:18:42, skipping insertion in model container [2019-11-07 01:18:42,216 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:18:41" (2/3) ... [2019-11-07 01:18:42,216 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@175c7b48 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:18:42, skipping insertion in model container [2019-11-07 01:18:42,216 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:18:42" (3/3) ... [2019-11-07 01:18:42,218 INFO L109 eAbstractionObserver]: Analyzing ICFG zero_sum_const4.c [2019-11-07 01:18:42,226 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-07 01:18:42,233 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-07 01:18:42,243 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-07 01:18:42,268 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-07 01:18:42,269 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-07 01:18:42,269 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-07 01:18:42,269 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-07 01:18:42,269 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-07 01:18:42,270 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-07 01:18:42,270 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-07 01:18:42,270 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-07 01:18:42,291 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states. [2019-11-07 01:18:42,300 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2019-11-07 01:18:42,300 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:18:42,301 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:18:42,304 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:18:42,310 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:18:42,311 INFO L82 PathProgramCache]: Analyzing trace with hash -1007897624, now seen corresponding path program 1 times [2019-11-07 01:18:42,322 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:18:42,323 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [487840576] [2019-11-07 01:18:42,324 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:18:42,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:18:42,545 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 01:18:42,546 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [487840576] [2019-11-07 01:18:42,547 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-07 01:18:42,548 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-11-07 01:18:42,549 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [279311261] [2019-11-07 01:18:42,555 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-11-07 01:18:42,556 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:18:42,574 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-11-07 01:18:42,575 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2019-11-07 01:18:42,578 INFO L87 Difference]: Start difference. First operand 26 states. Second operand 5 states. [2019-11-07 01:18:42,724 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:18:42,724 INFO L93 Difference]: Finished difference Result 49 states and 68 transitions. [2019-11-07 01:18:42,725 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-11-07 01:18:42,727 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 19 [2019-11-07 01:18:42,728 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:18:42,741 INFO L225 Difference]: With dead ends: 49 [2019-11-07 01:18:42,741 INFO L226 Difference]: Without dead ends: 28 [2019-11-07 01:18:42,750 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 01:18:42,770 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2019-11-07 01:18:42,815 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2019-11-07 01:18:42,816 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2019-11-07 01:18:42,819 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 43 transitions. [2019-11-07 01:18:42,822 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 43 transitions. Word has length 19 [2019-11-07 01:18:42,823 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:18:42,824 INFO L462 AbstractCegarLoop]: Abstraction has 28 states and 43 transitions. [2019-11-07 01:18:42,824 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-11-07 01:18:42,824 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 43 transitions. [2019-11-07 01:18:42,826 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2019-11-07 01:18:42,826 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:18:42,827 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 01:18:42,827 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:18:42,828 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:18:42,828 INFO L82 PathProgramCache]: Analyzing trace with hash 229580911, now seen corresponding path program 1 times [2019-11-07 01:18:42,828 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:18:42,829 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [961901712] [2019-11-07 01:18:42,829 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:18:42,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:18:42,943 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 01:18:42,943 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [961901712] [2019-11-07 01:18:42,944 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-07 01:18:42,944 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-07 01:18:42,944 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [664612402] [2019-11-07 01:18:42,946 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-07 01:18:42,946 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:18:42,947 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-07 01:18:42,947 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-07 01:18:42,947 INFO L87 Difference]: Start difference. First operand 28 states and 43 transitions. Second operand 3 states. [2019-11-07 01:18:43,013 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:18:43,013 INFO L93 Difference]: Finished difference Result 50 states and 80 transitions. [2019-11-07 01:18:43,013 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-07 01:18:43,014 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2019-11-07 01:18:43,014 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:18:43,015 INFO L225 Difference]: With dead ends: 50 [2019-11-07 01:18:43,015 INFO L226 Difference]: Without dead ends: 29 [2019-11-07 01:18:43,016 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 01:18:43,017 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2019-11-07 01:18:43,023 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2019-11-07 01:18:43,023 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2019-11-07 01:18:43,024 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 44 transitions. [2019-11-07 01:18:43,024 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 44 transitions. Word has length 20 [2019-11-07 01:18:43,025 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:18:43,025 INFO L462 AbstractCegarLoop]: Abstraction has 29 states and 44 transitions. [2019-11-07 01:18:43,025 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-07 01:18:43,025 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 44 transitions. [2019-11-07 01:18:43,026 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2019-11-07 01:18:43,026 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:18:43,027 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:18:43,027 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:18:43,027 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:18:43,028 INFO L82 PathProgramCache]: Analyzing trace with hash 269324722, now seen corresponding path program 1 times [2019-11-07 01:18:43,028 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:18:43,028 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1147539119] [2019-11-07 01:18:43,028 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:18:43,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:18:43,108 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 01:18:43,108 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1147539119] [2019-11-07 01:18:43,108 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-07 01:18:43,109 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-11-07 01:18:43,109 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1825476265] [2019-11-07 01:18:43,109 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-07 01:18:43,110 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:18:43,110 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-07 01:18:43,111 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-11-07 01:18:43,112 INFO L87 Difference]: Start difference. First operand 29 states and 44 transitions. Second operand 4 states. [2019-11-07 01:18:43,208 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:18:43,208 INFO L93 Difference]: Finished difference Result 48 states and 76 transitions. [2019-11-07 01:18:43,208 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-07 01:18:43,209 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 21 [2019-11-07 01:18:43,209 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:18:43,209 INFO L225 Difference]: With dead ends: 48 [2019-11-07 01:18:43,210 INFO L226 Difference]: Without dead ends: 29 [2019-11-07 01:18:43,210 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 01:18:43,211 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2019-11-07 01:18:43,216 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2019-11-07 01:18:43,217 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2019-11-07 01:18:43,218 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 37 transitions. [2019-11-07 01:18:43,218 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 37 transitions. Word has length 21 [2019-11-07 01:18:43,218 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:18:43,218 INFO L462 AbstractCegarLoop]: Abstraction has 29 states and 37 transitions. [2019-11-07 01:18:43,219 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-07 01:18:43,219 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 37 transitions. [2019-11-07 01:18:43,219 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2019-11-07 01:18:43,220 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:18:43,220 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:18:43,220 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:18:43,220 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:18:43,221 INFO L82 PathProgramCache]: Analyzing trace with hash -2044994938, now seen corresponding path program 1 times [2019-11-07 01:18:43,221 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:18:43,221 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1370266894] [2019-11-07 01:18:43,221 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:18:43,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:18:43,340 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2019-11-07 01:18:43,340 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1370266894] [2019-11-07 01:18:43,340 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1079873673] [2019-11-07 01:18:43,341 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 01:18:43,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:18:43,405 INFO L256 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 4 conjunts are in the unsatisfiable core [2019-11-07 01:18:43,412 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:18:43,469 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2019-11-07 01:18:43,470 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:18:43,504 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2019-11-07 01:18:43,504 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1510835140] [2019-11-07 01:18:43,531 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2019-11-07 01:18:43,532 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:18:43,538 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:18:43,546 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:18:43,546 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:18:43,694 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 30 for LOIs [2019-11-07 01:18:44,719 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2019-11-07 01:18:44,726 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 16 for LOIs [2019-11-07 01:18:44,729 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:18:45,391 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:18:45,392 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 11] total 18 [2019-11-07 01:18:45,393 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [394133279] [2019-11-07 01:18:45,394 INFO L442 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-11-07 01:18:45,394 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:18:45,394 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-11-07 01:18:45,396 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=255, Unknown=0, NotChecked=0, Total=306 [2019-11-07 01:18:45,397 INFO L87 Difference]: Start difference. First operand 29 states and 37 transitions. Second operand 18 states. [2019-11-07 01:18:46,131 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:18:46,131 INFO L93 Difference]: Finished difference Result 51 states and 67 transitions. [2019-11-07 01:18:46,131 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-11-07 01:18:46,131 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 28 [2019-11-07 01:18:46,132 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:18:46,132 INFO L225 Difference]: With dead ends: 51 [2019-11-07 01:18:46,132 INFO L226 Difference]: Without dead ends: 30 [2019-11-07 01:18:46,133 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 70 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 156 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=106, Invalid=544, Unknown=0, NotChecked=0, Total=650 [2019-11-07 01:18:46,134 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2019-11-07 01:18:46,141 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2019-11-07 01:18:46,141 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2019-11-07 01:18:46,142 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 38 transitions. [2019-11-07 01:18:46,143 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 38 transitions. Word has length 28 [2019-11-07 01:18:46,143 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:18:46,143 INFO L462 AbstractCegarLoop]: Abstraction has 30 states and 38 transitions. [2019-11-07 01:18:46,143 INFO L463 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-11-07 01:18:46,143 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 38 transitions. [2019-11-07 01:18:46,144 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2019-11-07 01:18:46,144 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:18:46,144 INFO L410 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:18:46,349 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:18:46,350 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:18:46,350 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:18:46,350 INFO L82 PathProgramCache]: Analyzing trace with hash 1298290889, now seen corresponding path program 2 times [2019-11-07 01:18:46,351 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:18:46,352 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [588076471] [2019-11-07 01:18:46,352 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:18:46,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:18:46,416 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-11-07 01:18:46,417 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [588076471] [2019-11-07 01:18:46,417 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [620984863] [2019-11-07 01:18:46,417 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 01:18:46,493 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2019-11-07 01:18:46,493 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 01:18:46,494 INFO L256 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 4 conjunts are in the unsatisfiable core [2019-11-07 01:18:46,497 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:18:46,521 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-11-07 01:18:46,522 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:18:46,548 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-11-07 01:18:46,548 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1828080076] [2019-11-07 01:18:46,550 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2019-11-07 01:18:46,550 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:18:46,551 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:18:46,551 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:18:46,551 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:18:46,588 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 30 for LOIs [2019-11-07 01:18:47,135 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2019-11-07 01:18:47,141 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 16 for LOIs [2019-11-07 01:18:47,143 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:18:47,686 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:18:47,686 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 11] total 19 [2019-11-07 01:18:47,687 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1113214780] [2019-11-07 01:18:47,688 INFO L442 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-11-07 01:18:47,688 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:18:47,688 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-11-07 01:18:47,689 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=286, Unknown=0, NotChecked=0, Total=342 [2019-11-07 01:18:47,689 INFO L87 Difference]: Start difference. First operand 30 states and 38 transitions. Second operand 19 states. [2019-11-07 01:18:48,565 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:18:48,565 INFO L93 Difference]: Finished difference Result 57 states and 79 transitions. [2019-11-07 01:18:48,566 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-11-07 01:18:48,566 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 29 [2019-11-07 01:18:48,566 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:18:48,567 INFO L225 Difference]: With dead ends: 57 [2019-11-07 01:18:48,567 INFO L226 Difference]: Without dead ends: 38 [2019-11-07 01:18:48,568 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 71 SyntacticMatches, 3 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 219 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=143, Invalid=727, Unknown=0, NotChecked=0, Total=870 [2019-11-07 01:18:48,568 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2019-11-07 01:18:48,575 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2019-11-07 01:18:48,576 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2019-11-07 01:18:48,577 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 46 transitions. [2019-11-07 01:18:48,577 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 46 transitions. Word has length 29 [2019-11-07 01:18:48,577 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:18:48,578 INFO L462 AbstractCegarLoop]: Abstraction has 38 states and 46 transitions. [2019-11-07 01:18:48,578 INFO L463 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-11-07 01:18:48,578 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 46 transitions. [2019-11-07 01:18:48,579 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2019-11-07 01:18:48,579 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:18:48,579 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:18:48,782 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:18:48,783 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:18:48,783 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:18:48,784 INFO L82 PathProgramCache]: Analyzing trace with hash 1705994344, now seen corresponding path program 3 times [2019-11-07 01:18:48,784 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:18:48,784 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [829060423] [2019-11-07 01:18:48,785 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:18:48,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:18:49,999 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 01:18:50,000 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [829060423] [2019-11-07 01:18:50,000 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1770508711] [2019-11-07 01:18:50,001 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 01:18:50,077 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-07 01:18:50,077 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 01:18:50,079 INFO L256 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 77 conjunts are in the unsatisfiable core [2019-11-07 01:18:50,089 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:18:50,420 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 01:18:50,421 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:18:50,788 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-11-07 01:18:50,789 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1205320438] [2019-11-07 01:18:50,791 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2019-11-07 01:18:50,791 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:18:50,791 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:18:50,792 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:18:50,792 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:18:50,813 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 30 for LOIs [2019-11-07 01:18:51,263 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2019-11-07 01:18:51,272 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 16 for LOIs [2019-11-07 01:18:51,274 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:18:52,109 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:18:52,109 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 13, 10, 11] total 42 [2019-11-07 01:18:52,110 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [343819747] [2019-11-07 01:18:52,111 INFO L442 AbstractCegarLoop]: Interpolant automaton has 42 states [2019-11-07 01:18:52,111 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:18:52,111 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2019-11-07 01:18:52,112 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=144, Invalid=1578, Unknown=0, NotChecked=0, Total=1722 [2019-11-07 01:18:52,112 INFO L87 Difference]: Start difference. First operand 38 states and 46 transitions. Second operand 42 states. [2019-11-07 01:18:54,188 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:18:54,188 INFO L93 Difference]: Finished difference Result 65 states and 80 transitions. [2019-11-07 01:18:54,189 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2019-11-07 01:18:54,189 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 37 [2019-11-07 01:18:54,189 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:18:54,190 INFO L225 Difference]: With dead ends: 65 [2019-11-07 01:18:54,190 INFO L226 Difference]: Without dead ends: 60 [2019-11-07 01:18:54,192 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 74 SyntacticMatches, 27 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1099 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=262, Invalid=2818, Unknown=0, NotChecked=0, Total=3080 [2019-11-07 01:18:54,192 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2019-11-07 01:18:54,202 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 58. [2019-11-07 01:18:54,202 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2019-11-07 01:18:54,203 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 73 transitions. [2019-11-07 01:18:54,204 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 73 transitions. Word has length 37 [2019-11-07 01:18:54,204 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:18:54,204 INFO L462 AbstractCegarLoop]: Abstraction has 58 states and 73 transitions. [2019-11-07 01:18:54,204 INFO L463 AbstractCegarLoop]: Interpolant automaton has 42 states. [2019-11-07 01:18:54,204 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 73 transitions. [2019-11-07 01:18:54,205 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2019-11-07 01:18:54,205 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:18:54,206 INFO L410 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:18:54,409 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:18:54,410 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:18:54,410 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:18:54,410 INFO L82 PathProgramCache]: Analyzing trace with hash -1727052881, now seen corresponding path program 4 times [2019-11-07 01:18:54,411 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:18:54,411 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1851531954] [2019-11-07 01:18:54,411 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:18:54,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:18:54,473 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2019-11-07 01:18:54,473 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1851531954] [2019-11-07 01:18:54,474 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [787299435] [2019-11-07 01:18:54,474 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 01:18:54,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:18:54,546 INFO L256 TraceCheckSpWp]: Trace formula consists of 191 conjuncts, 8 conjunts are in the unsatisfiable core [2019-11-07 01:18:54,549 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:18:54,585 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2019-11-07 01:18:54,586 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:18:54,632 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2019-11-07 01:18:54,633 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1970084617] [2019-11-07 01:18:54,635 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2019-11-07 01:18:54,635 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:18:54,636 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:18:54,636 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:18:54,636 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:18:54,657 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 32 for LOIs [2019-11-07 01:18:55,058 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2019-11-07 01:18:55,062 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 16 for LOIs [2019-11-07 01:18:55,064 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:18:55,698 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:18:55,698 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 11] total 24 [2019-11-07 01:18:55,699 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1498047803] [2019-11-07 01:18:55,700 INFO L442 AbstractCegarLoop]: Interpolant automaton has 24 states [2019-11-07 01:18:55,700 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:18:55,700 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2019-11-07 01:18:55,701 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=471, Unknown=0, NotChecked=0, Total=552 [2019-11-07 01:18:55,701 INFO L87 Difference]: Start difference. First operand 58 states and 73 transitions. Second operand 24 states. [2019-11-07 01:18:56,967 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:18:56,967 INFO L93 Difference]: Finished difference Result 118 states and 155 transitions. [2019-11-07 01:18:56,968 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2019-11-07 01:18:56,968 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 38 [2019-11-07 01:18:56,968 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:18:56,972 INFO L225 Difference]: With dead ends: 118 [2019-11-07 01:18:56,972 INFO L226 Difference]: Without dead ends: 67 [2019-11-07 01:18:56,974 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 95 SyntacticMatches, 4 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 399 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=219, Invalid=1263, Unknown=0, NotChecked=0, Total=1482 [2019-11-07 01:18:56,974 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2019-11-07 01:18:56,984 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 64. [2019-11-07 01:18:56,985 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2019-11-07 01:18:56,986 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 78 transitions. [2019-11-07 01:18:56,986 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 78 transitions. Word has length 38 [2019-11-07 01:18:56,986 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:18:56,986 INFO L462 AbstractCegarLoop]: Abstraction has 64 states and 78 transitions. [2019-11-07 01:18:56,986 INFO L463 AbstractCegarLoop]: Interpolant automaton has 24 states. [2019-11-07 01:18:56,986 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 78 transitions. [2019-11-07 01:18:56,987 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2019-11-07 01:18:56,988 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:18:56,988 INFO L410 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:18:57,191 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:18:57,192 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:18:57,192 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:18:57,192 INFO L82 PathProgramCache]: Analyzing trace with hash 145426994, now seen corresponding path program 5 times [2019-11-07 01:18:57,193 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:18:57,193 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1855417835] [2019-11-07 01:18:57,193 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:18:57,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:18:57,263 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2019-11-07 01:18:57,263 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1855417835] [2019-11-07 01:18:57,264 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1761216442] [2019-11-07 01:18:57,264 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 01:18:57,341 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-11-07 01:18:57,342 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 01:18:57,342 INFO L256 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 8 conjunts are in the unsatisfiable core [2019-11-07 01:18:57,345 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:18:57,393 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2019-11-07 01:18:57,393 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:18:57,431 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2019-11-07 01:18:57,432 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2089881172] [2019-11-07 01:18:57,433 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2019-11-07 01:18:57,434 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:18:57,434 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:18:57,434 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:18:57,434 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:18:57,461 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 30 for LOIs [2019-11-07 01:18:57,842 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2019-11-07 01:18:57,848 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 16 for LOIs [2019-11-07 01:18:57,850 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:18:58,386 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:18:58,387 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 11] total 25 [2019-11-07 01:18:58,387 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [405261662] [2019-11-07 01:18:58,388 INFO L442 AbstractCegarLoop]: Interpolant automaton has 25 states [2019-11-07 01:18:58,389 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:18:58,389 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2019-11-07 01:18:58,390 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=512, Unknown=0, NotChecked=0, Total=600 [2019-11-07 01:18:58,390 INFO L87 Difference]: Start difference. First operand 64 states and 78 transitions. Second operand 25 states. [2019-11-07 01:18:59,702 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:18:59,703 INFO L93 Difference]: Finished difference Result 70 states and 84 transitions. [2019-11-07 01:18:59,703 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2019-11-07 01:18:59,704 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 39 [2019-11-07 01:18:59,704 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:18:59,705 INFO L225 Difference]: With dead ends: 70 [2019-11-07 01:18:59,705 INFO L226 Difference]: Without dead ends: 47 [2019-11-07 01:18:59,706 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 96 SyntacticMatches, 6 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 433 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=213, Invalid=1269, Unknown=0, NotChecked=0, Total=1482 [2019-11-07 01:18:59,707 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2019-11-07 01:18:59,714 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2019-11-07 01:18:59,714 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2019-11-07 01:18:59,715 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 55 transitions. [2019-11-07 01:18:59,715 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 55 transitions. Word has length 39 [2019-11-07 01:18:59,715 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:18:59,715 INFO L462 AbstractCegarLoop]: Abstraction has 47 states and 55 transitions. [2019-11-07 01:18:59,715 INFO L463 AbstractCegarLoop]: Interpolant automaton has 25 states. [2019-11-07 01:18:59,715 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 55 transitions. [2019-11-07 01:18:59,716 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2019-11-07 01:18:59,717 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:18:59,717 INFO L410 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:18:59,920 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:18:59,921 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:18:59,921 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:18:59,921 INFO L82 PathProgramCache]: Analyzing trace with hash -119252730, now seen corresponding path program 6 times [2019-11-07 01:18:59,921 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:18:59,922 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1423643960] [2019-11-07 01:18:59,922 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:18:59,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:19:00,767 WARN L191 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 57 DAG size of output: 42 [2019-11-07 01:19:01,743 WARN L191 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 44 [2019-11-07 01:19:02,058 WARN L191 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 64 DAG size of output: 56 [2019-11-07 01:19:02,222 WARN L191 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 42 [2019-11-07 01:19:03,303 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 54 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 01:19:03,304 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1423643960] [2019-11-07 01:19:03,304 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1353550171] [2019-11-07 01:19:03,304 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 01:19:03,396 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-07 01:19:03,397 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 01:19:03,399 WARN L254 TraceCheckSpWp]: Trace formula consists of 217 conjuncts, 111 conjunts are in the unsatisfiable core [2019-11-07 01:19:03,409 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:19:04,108 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 54 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 01:19:04,108 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:19:04,848 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 48 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-11-07 01:19:04,848 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [479151077] [2019-11-07 01:19:04,852 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2019-11-07 01:19:04,852 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:19:04,853 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:19:04,853 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:19:04,854 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:19:04,895 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 32 for LOIs [2019-11-07 01:19:05,446 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2019-11-07 01:19:05,450 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 16 for LOIs [2019-11-07 01:19:05,452 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:19:06,595 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:19:06,595 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 16, 12, 11] total 62 [2019-11-07 01:19:06,596 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [753359844] [2019-11-07 01:19:06,597 INFO L442 AbstractCegarLoop]: Interpolant automaton has 62 states [2019-11-07 01:19:06,597 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:19:06,598 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2019-11-07 01:19:06,599 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=317, Invalid=3465, Unknown=0, NotChecked=0, Total=3782 [2019-11-07 01:19:06,599 INFO L87 Difference]: Start difference. First operand 47 states and 55 transitions. Second operand 62 states. [2019-11-07 01:19:07,533 WARN L191 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 78 DAG size of output: 54 [2019-11-07 01:19:07,933 WARN L191 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 79 DAG size of output: 50 [2019-11-07 01:19:08,118 WARN L191 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 80 DAG size of output: 51 [2019-11-07 01:19:08,313 WARN L191 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 77 DAG size of output: 49 [2019-11-07 01:19:08,493 WARN L191 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 56 [2019-11-07 01:19:09,126 WARN L191 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 77 DAG size of output: 56 [2019-11-07 01:19:09,638 WARN L191 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 79 DAG size of output: 50 [2019-11-07 01:19:10,003 WARN L191 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 73 DAG size of output: 59 [2019-11-07 01:19:11,812 WARN L191 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 79 DAG size of output: 46 [2019-11-07 01:19:12,426 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:19:12,426 INFO L93 Difference]: Finished difference Result 105 states and 131 transitions. [2019-11-07 01:19:12,427 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2019-11-07 01:19:12,427 INFO L78 Accepts]: Start accepts. Automaton has 62 states. Word has length 46 [2019-11-07 01:19:12,427 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:19:12,429 INFO L225 Difference]: With dead ends: 105 [2019-11-07 01:19:12,429 INFO L226 Difference]: Without dead ends: 100 [2019-11-07 01:19:12,432 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 204 GetRequests, 90 SyntacticMatches, 28 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3456 ImplicationChecksByTransitivity, 8.8s TimeCoverageRelationStatistics Valid=677, Invalid=6979, Unknown=0, NotChecked=0, Total=7656 [2019-11-07 01:19:12,433 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2019-11-07 01:19:12,449 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 73. [2019-11-07 01:19:12,449 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2019-11-07 01:19:12,450 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 88 transitions. [2019-11-07 01:19:12,450 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 88 transitions. Word has length 46 [2019-11-07 01:19:12,450 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:19:12,451 INFO L462 AbstractCegarLoop]: Abstraction has 73 states and 88 transitions. [2019-11-07 01:19:12,451 INFO L463 AbstractCegarLoop]: Interpolant automaton has 62 states. [2019-11-07 01:19:12,451 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 88 transitions. [2019-11-07 01:19:12,452 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2019-11-07 01:19:12,452 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:19:12,452 INFO L410 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:19:12,656 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:19:12,657 INFO L410 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:19:12,657 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:19:12,657 INFO L82 PathProgramCache]: Analyzing trace with hash 1270554803, now seen corresponding path program 7 times [2019-11-07 01:19:12,658 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:19:12,658 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [917453933] [2019-11-07 01:19:12,659 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:19:12,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:19:12,755 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 7 proven. 9 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2019-11-07 01:19:12,755 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [917453933] [2019-11-07 01:19:12,756 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1046504755] [2019-11-07 01:19:12,756 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 01:19:12,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:19:12,870 INFO L256 TraceCheckSpWp]: Trace formula consists of 235 conjuncts, 10 conjunts are in the unsatisfiable core [2019-11-07 01:19:12,882 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:19:12,942 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2019-11-07 01:19:12,943 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:19:12,996 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2019-11-07 01:19:12,996 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [476008871] [2019-11-07 01:19:12,997 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2019-11-07 01:19:12,998 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:19:12,998 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:19:12,998 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:19:12,999 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:19:13,014 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 32 for LOIs [2019-11-07 01:19:13,481 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2019-11-07 01:19:13,484 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 16 for LOIs [2019-11-07 01:19:13,486 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:19:14,095 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:19:14,096 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10, 11] total 27 [2019-11-07 01:19:14,096 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [245562001] [2019-11-07 01:19:14,097 INFO L442 AbstractCegarLoop]: Interpolant automaton has 27 states [2019-11-07 01:19:14,098 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:19:14,098 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2019-11-07 01:19:14,099 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=599, Unknown=0, NotChecked=0, Total=702 [2019-11-07 01:19:14,099 INFO L87 Difference]: Start difference. First operand 73 states and 88 transitions. Second operand 27 states. [2019-11-07 01:19:15,583 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:19:15,583 INFO L93 Difference]: Finished difference Result 148 states and 185 transitions. [2019-11-07 01:19:15,583 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2019-11-07 01:19:15,584 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 47 [2019-11-07 01:19:15,584 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:19:15,584 INFO L225 Difference]: With dead ends: 148 [2019-11-07 01:19:15,584 INFO L226 Difference]: Without dead ends: 82 [2019-11-07 01:19:15,586 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 168 GetRequests, 119 SyntacticMatches, 6 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 584 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=289, Invalid=1691, Unknown=0, NotChecked=0, Total=1980 [2019-11-07 01:19:15,586 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2019-11-07 01:19:15,601 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 79. [2019-11-07 01:19:15,602 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2019-11-07 01:19:15,602 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 93 transitions. [2019-11-07 01:19:15,602 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 93 transitions. Word has length 47 [2019-11-07 01:19:15,603 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:19:15,603 INFO L462 AbstractCegarLoop]: Abstraction has 79 states and 93 transitions. [2019-11-07 01:19:15,603 INFO L463 AbstractCegarLoop]: Interpolant automaton has 27 states. [2019-11-07 01:19:15,603 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 93 transitions. [2019-11-07 01:19:15,604 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2019-11-07 01:19:15,604 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:19:15,604 INFO L410 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:19:15,807 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:19:15,808 INFO L410 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:19:15,808 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:19:15,808 INFO L82 PathProgramCache]: Analyzing trace with hash 160628112, now seen corresponding path program 8 times [2019-11-07 01:19:15,809 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:19:15,809 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [723492567] [2019-11-07 01:19:15,809 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:19:15,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:19:15,895 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 3 proven. 13 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2019-11-07 01:19:15,895 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [723492567] [2019-11-07 01:19:15,895 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1170379750] [2019-11-07 01:19:15,895 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 01:19:16,000 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-11-07 01:19:16,000 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 01:19:16,001 INFO L256 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 10 conjunts are in the unsatisfiable core [2019-11-07 01:19:16,002 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:19:16,075 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2019-11-07 01:19:16,075 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:19:16,122 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2019-11-07 01:19:16,122 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1701923475] [2019-11-07 01:19:16,124 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2019-11-07 01:19:16,124 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:19:16,124 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:19:16,125 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:19:16,125 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:19:16,146 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 32 for LOIs [2019-11-07 01:19:16,479 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2019-11-07 01:19:16,483 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 16 for LOIs [2019-11-07 01:19:16,487 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:19:17,061 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:19:17,061 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11, 11] total 28 [2019-11-07 01:19:17,062 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1542968676] [2019-11-07 01:19:17,062 INFO L442 AbstractCegarLoop]: Interpolant automaton has 28 states [2019-11-07 01:19:17,063 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:19:17,063 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2019-11-07 01:19:17,064 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=646, Unknown=0, NotChecked=0, Total=756 [2019-11-07 01:19:17,064 INFO L87 Difference]: Start difference. First operand 79 states and 93 transitions. Second operand 28 states. [2019-11-07 01:19:18,648 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:19:18,648 INFO L93 Difference]: Finished difference Result 85 states and 99 transitions. [2019-11-07 01:19:18,649 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2019-11-07 01:19:18,649 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 48 [2019-11-07 01:19:18,649 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:19:18,650 INFO L225 Difference]: With dead ends: 85 [2019-11-07 01:19:18,650 INFO L226 Difference]: Without dead ends: 56 [2019-11-07 01:19:18,652 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 120 SyntacticMatches, 8 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 601 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=266, Invalid=1626, Unknown=0, NotChecked=0, Total=1892 [2019-11-07 01:19:18,652 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2019-11-07 01:19:18,663 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2019-11-07 01:19:18,663 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2019-11-07 01:19:18,663 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 64 transitions. [2019-11-07 01:19:18,663 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 64 transitions. Word has length 48 [2019-11-07 01:19:18,664 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:19:18,664 INFO L462 AbstractCegarLoop]: Abstraction has 56 states and 64 transitions. [2019-11-07 01:19:18,664 INFO L463 AbstractCegarLoop]: Interpolant automaton has 28 states. [2019-11-07 01:19:18,664 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 64 transitions. [2019-11-07 01:19:18,665 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2019-11-07 01:19:18,665 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:19:18,665 INFO L410 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:19:18,869 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:19:18,869 INFO L410 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:19:18,869 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:19:18,869 INFO L82 PathProgramCache]: Analyzing trace with hash 866036968, now seen corresponding path program 9 times [2019-11-07 01:19:18,869 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:19:18,870 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1077571835] [2019-11-07 01:19:18,870 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:19:19,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:19:19,741 WARN L191 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 68 DAG size of output: 41 [2019-11-07 01:19:19,862 WARN L191 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 42 [2019-11-07 01:19:20,093 WARN L191 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 68 DAG size of output: 44 [2019-11-07 01:19:20,219 WARN L191 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 59 DAG size of output: 40 [2019-11-07 01:19:20,530 WARN L191 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 44 [2019-11-07 01:19:20,729 WARN L191 SmtUtils]: Spent 167.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 42 [2019-11-07 01:19:20,940 WARN L191 SmtUtils]: Spent 177.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 49 [2019-11-07 01:19:21,128 WARN L191 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 38 [2019-11-07 01:19:21,348 WARN L191 SmtUtils]: Spent 167.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 37 [2019-11-07 01:19:21,575 WARN L191 SmtUtils]: Spent 179.00 ms on a formula simplification. DAG size of input: 76 DAG size of output: 44 [2019-11-07 01:19:21,849 WARN L191 SmtUtils]: Spent 202.00 ms on a formula simplification. DAG size of input: 73 DAG size of output: 45