/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_const2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-fb55353 [2019-11-07 01:18:37,264 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-07 01:18:37,266 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-07 01:18:37,279 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2019-11-07 01:18:37,289 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-07 01:18:37,290 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-07 01:18:37,291 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-07 01:18:37,292 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-07 01:18:37,293 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-07 01:18:37,294 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-07 01:18:37,295 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-07 01:18:37,297 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-07 01:18:37,298 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-07 01:18:37,299 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-07 01:18:37,300 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-07 01:18:37,301 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-07 01:18:37,304 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-11-07 01:18:37,317 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-07 01:18:37,318 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-07 01:18:37,318 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-07 01:18:37,319 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 01:18:37,340 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-07 01:18:37,341 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-07 01:18:37,342 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-07 01:18:37,342 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-07 01:18:37,342 INFO L138 SettingsManager]: * Use SBE=true [2019-11-07 01:18:37,343 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-07 01:18:37,343 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-07 01:18:37,343 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-07 01:18:37,343 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-07 01:18:37,343 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-07 01:18:37,343 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-07 01:18:37,344 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-07 01:18:37,344 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-07 01:18:37,344 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-07 01:18:37,344 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-07 01:18:37,344 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-07 01:18:37,345 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-07 01:18:37,345 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-07 01:18:37,345 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-07 01:18:37,345 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-07 01:18:37,345 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-07 01:18:37,346 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-07 01:18:37,346 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-07 01:18:37,346 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-07 01:18:37,346 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-07 01:18:37,346 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-07 01:18:37,347 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-07 01:18:37,347 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-07 01:18:37,347 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 01:18:37,634 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-07 01:18:37,648 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-07 01:18:37,653 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-07 01:18:37,655 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-07 01:18:37,656 INFO L275 PluginConnector]: CDTParser initialized [2019-11-07 01:18:37,656 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-crafted/zero_sum_const2.c [2019-11-07 01:18:37,733 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0cb9b97ad/99062a8e5d2a49c0b32e5c20ae4b740f/FLAGa45217ccc [2019-11-07 01:18:38,228 INFO L306 CDTParser]: Found 1 translation units. [2019-11-07 01:18:38,229 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-crafted/zero_sum_const2.c [2019-11-07 01:18:38,236 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0cb9b97ad/99062a8e5d2a49c0b32e5c20ae4b740f/FLAGa45217ccc [2019-11-07 01:18:38,596 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0cb9b97ad/99062a8e5d2a49c0b32e5c20ae4b740f [2019-11-07 01:18:38,606 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-07 01:18:38,608 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-11-07 01:18:38,609 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-07 01:18:38,609 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-07 01:18:38,612 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-07 01:18:38,613 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:18:38" (1/1) ... [2019-11-07 01:18:38,616 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@fd4c054 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:18:38, skipping insertion in model container [2019-11-07 01:18:38,617 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:18:38" (1/1) ... [2019-11-07 01:18:38,624 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-11-07 01:18:38,646 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-11-07 01:18:38,880 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-07 01:18:38,892 INFO L188 MainTranslator]: Completed pre-run [2019-11-07 01:18:38,923 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-07 01:18:38,938 INFO L192 MainTranslator]: Completed translation [2019-11-07 01:18:38,938 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:18:38 WrapperNode [2019-11-07 01:18:38,938 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-07 01:18:38,939 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-07 01:18:38,939 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-07 01:18:38,939 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-07 01:18:39,033 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:18:38" (1/1) ... [2019-11-07 01:18:39,033 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:18:38" (1/1) ... [2019-11-07 01:18:39,042 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:18:38" (1/1) ... [2019-11-07 01:18:39,044 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:18:38" (1/1) ... [2019-11-07 01:18:39,065 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:18:38" (1/1) ... [2019-11-07 01:18:39,073 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:18:38" (1/1) ... [2019-11-07 01:18:39,074 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:18:38" (1/1) ... [2019-11-07 01:18:39,076 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-07 01:18:39,077 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-07 01:18:39,077 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-07 01:18:39,077 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-07 01:18:39,078 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:18:38" (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 01:18:39,137 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-11-07 01:18:39,137 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-07 01:18:39,138 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-11-07 01:18:39,138 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-11-07 01:18:39,138 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-11-07 01:18:39,138 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assume [2019-11-07 01:18:39,138 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-11-07 01:18:39,138 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_long [2019-11-07 01:18:39,139 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2019-11-07 01:18:39,139 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-11-07 01:18:39,139 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2019-11-07 01:18:39,139 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-11-07 01:18:39,139 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-11-07 01:18:39,139 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-11-07 01:18:39,140 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-07 01:18:39,140 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-11-07 01:18:39,554 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-07 01:18:39,555 INFO L284 CfgBuilder]: Removed 5 assume(true) statements. [2019-11-07 01:18:39,556 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:18:39 BoogieIcfgContainer [2019-11-07 01:18:39,557 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-07 01:18:39,558 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-07 01:18:39,558 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-07 01:18:39,561 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-07 01:18:39,562 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 01:18:38" (1/3) ... [2019-11-07 01:18:39,563 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@78aaffb2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:18:39, skipping insertion in model container [2019-11-07 01:18:39,563 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:18:38" (2/3) ... [2019-11-07 01:18:39,563 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@78aaffb2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:18:39, skipping insertion in model container [2019-11-07 01:18:39,564 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:18:39" (3/3) ... [2019-11-07 01:18:39,565 INFO L109 eAbstractionObserver]: Analyzing ICFG zero_sum_const2.c [2019-11-07 01:18:39,573 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-07 01:18:39,580 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-07 01:18:39,592 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-07 01:18:39,616 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-07 01:18:39,616 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-07 01:18:39,617 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-07 01:18:39,617 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-07 01:18:39,617 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-07 01:18:39,617 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-07 01:18:39,617 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-07 01:18:39,618 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-07 01:18:39,633 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states. [2019-11-07 01:18:39,638 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-11-07 01:18:39,638 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:18:39,640 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:18:39,642 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:18:39,647 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:18:39,647 INFO L82 PathProgramCache]: Analyzing trace with hash -1821330543, now seen corresponding path program 1 times [2019-11-07 01:18:39,654 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:18:39,655 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [14283502] [2019-11-07 01:18:39,655 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:18:39,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:18:39,878 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 01:18:39,878 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [14283502] [2019-11-07 01:18:39,879 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-07 01:18:39,880 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-11-07 01:18:39,881 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [647364712] [2019-11-07 01:18:39,886 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-11-07 01:18:39,887 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:18:39,901 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-11-07 01:18:39,902 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2019-11-07 01:18:39,905 INFO L87 Difference]: Start difference. First operand 22 states. Second operand 5 states. [2019-11-07 01:18:40,004 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:18:40,005 INFO L93 Difference]: Finished difference Result 41 states and 52 transitions. [2019-11-07 01:18:40,006 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-11-07 01:18:40,007 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 15 [2019-11-07 01:18:40,008 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:18:40,017 INFO L225 Difference]: With dead ends: 41 [2019-11-07 01:18:40,017 INFO L226 Difference]: Without dead ends: 20 [2019-11-07 01:18:40,021 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 01:18:40,040 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2019-11-07 01:18:40,058 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2019-11-07 01:18:40,060 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2019-11-07 01:18:40,061 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 27 transitions. [2019-11-07 01:18:40,063 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 27 transitions. Word has length 15 [2019-11-07 01:18:40,063 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:18:40,064 INFO L462 AbstractCegarLoop]: Abstraction has 20 states and 27 transitions. [2019-11-07 01:18:40,064 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-11-07 01:18:40,064 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 27 transitions. [2019-11-07 01:18:40,065 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-11-07 01:18:40,065 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:18:40,065 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:18:40,066 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:18:40,066 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:18:40,066 INFO L82 PathProgramCache]: Analyzing trace with hash 780224693, now seen corresponding path program 1 times [2019-11-07 01:18:40,067 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:18:40,067 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [999967252] [2019-11-07 01:18:40,067 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:18:40,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:18:40,135 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 01:18:40,135 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [999967252] [2019-11-07 01:18:40,136 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-07 01:18:40,136 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-07 01:18:40,136 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2102532718] [2019-11-07 01:18:40,138 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-07 01:18:40,138 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:18:40,138 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-07 01:18:40,139 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-07 01:18:40,139 INFO L87 Difference]: Start difference. First operand 20 states and 27 transitions. Second operand 3 states. [2019-11-07 01:18:40,175 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:18:40,175 INFO L93 Difference]: Finished difference Result 34 states and 48 transitions. [2019-11-07 01:18:40,176 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-07 01:18:40,176 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 16 [2019-11-07 01:18:40,176 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:18:40,177 INFO L225 Difference]: With dead ends: 34 [2019-11-07 01:18:40,177 INFO L226 Difference]: Without dead ends: 21 [2019-11-07 01:18:40,179 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 01:18:40,179 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2019-11-07 01:18:40,184 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2019-11-07 01:18:40,184 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2019-11-07 01:18:40,185 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 28 transitions. [2019-11-07 01:18:40,186 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 28 transitions. Word has length 16 [2019-11-07 01:18:40,186 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:18:40,186 INFO L462 AbstractCegarLoop]: Abstraction has 21 states and 28 transitions. [2019-11-07 01:18:40,186 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-07 01:18:40,186 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 28 transitions. [2019-11-07 01:18:40,187 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2019-11-07 01:18:40,187 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:18:40,188 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 01:18:40,188 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:18:40,188 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:18:40,188 INFO L82 PathProgramCache]: Analyzing trace with hash 2044161761, now seen corresponding path program 1 times [2019-11-07 01:18:40,189 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:18:40,189 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [358009035] [2019-11-07 01:18:40,189 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:18:40,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:18:40,255 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 01:18:40,256 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [358009035] [2019-11-07 01:18:40,256 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-07 01:18:40,256 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-11-07 01:18:40,256 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2108390560] [2019-11-07 01:18:40,257 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-07 01:18:40,257 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:18:40,257 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-07 01:18:40,258 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-11-07 01:18:40,258 INFO L87 Difference]: Start difference. First operand 21 states and 28 transitions. Second operand 4 states. [2019-11-07 01:18:40,335 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:18:40,335 INFO L93 Difference]: Finished difference Result 32 states and 44 transitions. [2019-11-07 01:18:40,336 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-07 01:18:40,336 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 17 [2019-11-07 01:18:40,336 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:18:40,337 INFO L225 Difference]: With dead ends: 32 [2019-11-07 01:18:40,337 INFO L226 Difference]: Without dead ends: 21 [2019-11-07 01:18:40,338 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 01:18:40,338 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2019-11-07 01:18:40,350 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2019-11-07 01:18:40,350 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2019-11-07 01:18:40,351 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2019-11-07 01:18:40,351 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 17 [2019-11-07 01:18:40,352 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:18:40,352 INFO L462 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2019-11-07 01:18:40,352 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-07 01:18:40,352 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2019-11-07 01:18:40,354 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2019-11-07 01:18:40,354 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:18:40,355 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 01:18:40,355 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:18:40,355 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:18:40,355 INFO L82 PathProgramCache]: Analyzing trace with hash -791089743, now seen corresponding path program 1 times [2019-11-07 01:18:40,356 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:18:40,356 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [96170662] [2019-11-07 01:18:40,357 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:18:40,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:18:40,489 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 01:18:40,490 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [96170662] [2019-11-07 01:18:40,490 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1566322572] [2019-11-07 01:18:40,490 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 01:18:40,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:18:40,558 INFO L256 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 4 conjunts are in the unsatisfiable core [2019-11-07 01:18:40,565 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:18:40,624 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 01:18:40,624 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:18:40,660 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 01:18:40,661 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1978608237] [2019-11-07 01:18:40,699 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2019-11-07 01:18:40,699 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:18:40,706 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:18:40,714 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:18:40,714 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:18:40,880 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 30 for LOIs [2019-11-07 01:18:41,488 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2019-11-07 01:18:41,498 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 16 for LOIs [2019-11-07 01:18:41,502 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:18:42,299 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:18:42,299 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 11] total 18 [2019-11-07 01:18:42,300 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1477003016] [2019-11-07 01:18:42,302 INFO L442 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-11-07 01:18:42,302 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:18:42,302 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-11-07 01:18:42,303 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=255, Unknown=0, NotChecked=0, Total=306 [2019-11-07 01:18:42,307 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 18 states. [2019-11-07 01:18:43,041 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:18:43,042 INFO L93 Difference]: Finished difference Result 35 states and 43 transitions. [2019-11-07 01:18:43,042 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-11-07 01:18:43,042 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 20 [2019-11-07 01:18:43,043 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:18:43,043 INFO L225 Difference]: With dead ends: 35 [2019-11-07 01:18:43,043 INFO L226 Difference]: Without dead ends: 22 [2019-11-07 01:18:43,044 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 156 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=106, Invalid=544, Unknown=0, NotChecked=0, Total=650 [2019-11-07 01:18:43,047 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2019-11-07 01:18:43,055 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2019-11-07 01:18:43,055 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2019-11-07 01:18:43,057 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 26 transitions. [2019-11-07 01:18:43,057 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 26 transitions. Word has length 20 [2019-11-07 01:18:43,057 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:18:43,057 INFO L462 AbstractCegarLoop]: Abstraction has 22 states and 26 transitions. [2019-11-07 01:18:43,057 INFO L463 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-11-07 01:18:43,058 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 26 transitions. [2019-11-07 01:18:43,059 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2019-11-07 01:18:43,059 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:18:43,061 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] [2019-11-07 01:18:43,267 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:18:43,268 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:18:43,268 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:18:43,268 INFO L82 PathProgramCache]: Analyzing trace with hash -1692918307, now seen corresponding path program 2 times [2019-11-07 01:18:43,269 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:18:43,270 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1350567297] [2019-11-07 01:18:43,270 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:18:43,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:18:43,365 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-11-07 01:18:43,365 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1350567297] [2019-11-07 01:18:43,366 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [162484925] [2019-11-07 01:18:43,367 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 01:18:43,425 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2019-11-07 01:18:43,426 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 01:18:43,427 INFO L256 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 4 conjunts are in the unsatisfiable core [2019-11-07 01:18:43,435 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:18:43,467 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-11-07 01:18:43,469 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:18:43,491 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-11-07 01:18:43,492 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [989691853] [2019-11-07 01:18:43,494 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2019-11-07 01:18:43,494 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:18:43,496 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:18:43,497 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:18:43,497 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:18:43,540 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 30 for LOIs [2019-11-07 01:18:43,905 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2019-11-07 01:18:43,912 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 16 for LOIs [2019-11-07 01:18:43,915 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:18:44,600 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:18:44,600 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 11] total 19 [2019-11-07 01:18:44,601 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1865525800] [2019-11-07 01:18:44,601 INFO L442 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-11-07 01:18:44,602 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:18:44,602 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-11-07 01:18:44,602 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=286, Unknown=0, NotChecked=0, Total=342 [2019-11-07 01:18:44,603 INFO L87 Difference]: Start difference. First operand 22 states and 26 transitions. Second operand 19 states. [2019-11-07 01:18:45,670 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:18:45,671 INFO L93 Difference]: Finished difference Result 37 states and 47 transitions. [2019-11-07 01:18:45,671 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-11-07 01:18:45,671 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 21 [2019-11-07 01:18:45,672 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:18:45,672 INFO L225 Difference]: With dead ends: 37 [2019-11-07 01:18:45,673 INFO L226 Difference]: Without dead ends: 26 [2019-11-07 01:18:45,674 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 47 SyntacticMatches, 3 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 219 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=143, Invalid=727, Unknown=0, NotChecked=0, Total=870 [2019-11-07 01:18:45,674 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2019-11-07 01:18:45,679 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2019-11-07 01:18:45,679 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2019-11-07 01:18:45,680 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 30 transitions. [2019-11-07 01:18:45,681 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 30 transitions. Word has length 21 [2019-11-07 01:18:45,681 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:18:45,681 INFO L462 AbstractCegarLoop]: Abstraction has 26 states and 30 transitions. [2019-11-07 01:18:45,681 INFO L463 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-11-07 01:18:45,681 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 30 transitions. [2019-11-07 01:18:45,682 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2019-11-07 01:18:45,682 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:18:45,682 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 01:18:45,893 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:18:45,893 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:18:45,893 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:18:45,893 INFO L82 PathProgramCache]: Analyzing trace with hash 1878882833, now seen corresponding path program 3 times [2019-11-07 01:18:45,894 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:18:45,894 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1568558118] [2019-11-07 01:18:45,894 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:18:45,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:18:46,830 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 01:18:46,830 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1568558118] [2019-11-07 01:18:46,831 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [925743747] [2019-11-07 01:18:46,831 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 01:18:46,888 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-07 01:18:46,888 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 01:18:46,889 INFO L256 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 45 conjunts are in the unsatisfiable core [2019-11-07 01:18:46,892 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:18:47,218 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 01:18:47,218 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:18:47,563 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 01:18:47,564 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1431008354] [2019-11-07 01:18:47,565 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2019-11-07 01:18:47,566 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:18:47,566 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:18:47,566 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:18:47,567 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:18:47,596 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 30 for LOIs [2019-11-07 01:18:48,068 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2019-11-07 01:18:48,074 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 16 for LOIs [2019-11-07 01:18:48,076 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:18:49,061 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:18:49,061 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 13, 10, 11] total 45 [2019-11-07 01:18:49,062 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [873022961] [2019-11-07 01:18:49,063 INFO L442 AbstractCegarLoop]: Interpolant automaton has 45 states [2019-11-07 01:18:49,063 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:18:49,063 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2019-11-07 01:18:49,064 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=165, Invalid=1815, Unknown=0, NotChecked=0, Total=1980 [2019-11-07 01:18:49,065 INFO L87 Difference]: Start difference. First operand 26 states and 30 transitions. Second operand 45 states. [2019-11-07 01:18:51,092 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:18:51,092 INFO L93 Difference]: Finished difference Result 41 states and 48 transitions. [2019-11-07 01:18:51,092 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2019-11-07 01:18:51,092 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 25 [2019-11-07 01:18:51,093 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:18:51,094 INFO L225 Difference]: With dead ends: 41 [2019-11-07 01:18:51,094 INFO L226 Difference]: Without dead ends: 36 [2019-11-07 01:18:51,099 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 45 SyntacticMatches, 5 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1100 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=288, Invalid=3134, Unknown=0, NotChecked=0, Total=3422 [2019-11-07 01:18:51,099 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2019-11-07 01:18:51,108 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 34. [2019-11-07 01:18:51,109 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2019-11-07 01:18:51,111 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 41 transitions. [2019-11-07 01:18:51,112 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 41 transitions. Word has length 25 [2019-11-07 01:18:51,112 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:18:51,112 INFO L462 AbstractCegarLoop]: Abstraction has 34 states and 41 transitions. [2019-11-07 01:18:51,112 INFO L463 AbstractCegarLoop]: Interpolant automaton has 45 states. [2019-11-07 01:18:51,112 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 41 transitions. [2019-11-07 01:18:51,113 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2019-11-07 01:18:51,113 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:18:51,114 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 01:18:51,325 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:18:51,326 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:18:51,326 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:18:51,326 INFO L82 PathProgramCache]: Analyzing trace with hash -220862923, now seen corresponding path program 4 times [2019-11-07 01:18:51,327 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:18:51,327 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1640056347] [2019-11-07 01:18:51,327 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:18:51,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:18:51,411 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 01:18:51,412 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1640056347] [2019-11-07 01:18:51,412 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [207239784] [2019-11-07 01:18:51,412 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 01:18:51,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:18:51,470 INFO L256 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 8 conjunts are in the unsatisfiable core [2019-11-07 01:18:51,478 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:18:51,538 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 01:18:51,538 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:18:51,596 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 01:18:51,597 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [739266594] [2019-11-07 01:18:51,599 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2019-11-07 01:18:51,599 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:18:51,599 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:18:51,600 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:18:51,600 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:18:51,632 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 32 for LOIs [2019-11-07 01:18:51,884 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2019-11-07 01:18:51,890 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 16 for LOIs [2019-11-07 01:18:51,892 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:18:52,675 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:18:52,675 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 11] total 24 [2019-11-07 01:18:52,676 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [213125330] [2019-11-07 01:18:52,677 INFO L442 AbstractCegarLoop]: Interpolant automaton has 24 states [2019-11-07 01:18:52,677 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:18:52,677 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2019-11-07 01:18:52,678 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=471, Unknown=0, NotChecked=0, Total=552 [2019-11-07 01:18:52,678 INFO L87 Difference]: Start difference. First operand 34 states and 41 transitions. Second operand 24 states. [2019-11-07 01:18:53,937 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:18:53,937 INFO L93 Difference]: Finished difference Result 66 states and 83 transitions. [2019-11-07 01:18:53,937 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2019-11-07 01:18:53,938 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 26 [2019-11-07 01:18:53,938 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:18:53,940 INFO L225 Difference]: With dead ends: 66 [2019-11-07 01:18:53,940 INFO L226 Difference]: Without dead ends: 39 [2019-11-07 01:18:53,942 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 59 SyntacticMatches, 4 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 400 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=219, Invalid=1263, Unknown=0, NotChecked=0, Total=1482 [2019-11-07 01:18:53,942 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2019-11-07 01:18:53,949 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 36. [2019-11-07 01:18:53,949 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2019-11-07 01:18:53,950 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 42 transitions. [2019-11-07 01:18:53,950 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 42 transitions. Word has length 26 [2019-11-07 01:18:53,951 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:18:53,951 INFO L462 AbstractCegarLoop]: Abstraction has 36 states and 42 transitions. [2019-11-07 01:18:53,951 INFO L463 AbstractCegarLoop]: Interpolant automaton has 24 states. [2019-11-07 01:18:53,951 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 42 transitions. [2019-11-07 01:18:53,952 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2019-11-07 01:18:53,952 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:18:53,952 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 01:18:54,156 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:18:54,157 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:18:54,157 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:18:54,157 INFO L82 PathProgramCache]: Analyzing trace with hash 344147297, now seen corresponding path program 5 times [2019-11-07 01:18:54,157 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:18:54,158 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1540827812] [2019-11-07 01:18:54,158 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:18:54,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:18:54,240 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 01:18:54,241 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1540827812] [2019-11-07 01:18:54,241 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [449256418] [2019-11-07 01:18:54,241 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 01:18:54,329 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-11-07 01:18:54,330 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 01:18:54,330 INFO L256 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 8 conjunts are in the unsatisfiable core [2019-11-07 01:18:54,332 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:18:54,393 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 01:18:54,393 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:18:54,457 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 01:18:54,458 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1467159434] [2019-11-07 01:18:54,459 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2019-11-07 01:18:54,459 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:18:54,460 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:18:54,460 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:18:54,460 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:18:54,487 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 30 for LOIs [2019-11-07 01:18:54,710 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2019-11-07 01:18:54,716 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 16 for LOIs [2019-11-07 01:18:54,717 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:18:55,455 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:18:55,455 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 11] total 25 [2019-11-07 01:18:55,456 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [109424082] [2019-11-07 01:18:55,457 INFO L442 AbstractCegarLoop]: Interpolant automaton has 25 states [2019-11-07 01:18:55,457 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:18:55,457 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2019-11-07 01:18:55,458 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=512, Unknown=0, NotChecked=0, Total=600 [2019-11-07 01:18:55,459 INFO L87 Difference]: Start difference. First operand 36 states and 42 transitions. Second operand 25 states. [2019-11-07 01:18:56,915 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:18:56,915 INFO L93 Difference]: Finished difference Result 42 states and 48 transitions. [2019-11-07 01:18:56,916 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2019-11-07 01:18:56,916 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 27 [2019-11-07 01:18:56,917 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:18:56,917 INFO L225 Difference]: With dead ends: 42 [2019-11-07 01:18:56,918 INFO L226 Difference]: Without dead ends: 31 [2019-11-07 01:18:56,919 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 60 SyntacticMatches, 6 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 433 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=213, Invalid=1269, Unknown=0, NotChecked=0, Total=1482 [2019-11-07 01:18:56,919 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2019-11-07 01:18:56,925 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2019-11-07 01:18:56,925 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2019-11-07 01:18:56,925 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 35 transitions. [2019-11-07 01:18:56,926 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 35 transitions. Word has length 27 [2019-11-07 01:18:56,926 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:18:56,926 INFO L462 AbstractCegarLoop]: Abstraction has 31 states and 35 transitions. [2019-11-07 01:18:56,926 INFO L463 AbstractCegarLoop]: Interpolant automaton has 25 states. [2019-11-07 01:18:56,926 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 35 transitions. [2019-11-07 01:18:56,927 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2019-11-07 01:18:56,927 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:18:56,927 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 01:18:57,129 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:18:57,130 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:18:57,130 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:18:57,130 INFO L82 PathProgramCache]: Analyzing trace with hash 339030193, now seen corresponding path program 6 times [2019-11-07 01:18:57,130 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:18:57,130 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [781067064] [2019-11-07 01:18:57,131 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:18:57,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:18:57,755 WARN L191 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 59 DAG size of output: 37 [2019-11-07 01:18:57,930 WARN L191 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 43 [2019-11-07 01:18:58,110 WARN L191 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 39 [2019-11-07 01:18:58,429 WARN L191 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 43 [2019-11-07 01:18:58,567 WARN L191 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 41 [2019-11-07 01:18:58,714 WARN L191 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 38 [2019-11-07 01:18:59,188 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 01:18:59,188 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [781067064] [2019-11-07 01:18:59,188 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [204627688] [2019-11-07 01:18:59,189 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 01:18:59,253 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-07 01:18:59,253 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 01:18:59,254 INFO L256 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 63 conjunts are in the unsatisfiable core [2019-11-07 01:18:59,257 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:18:59,889 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 01:18:59,889 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:19:00,328 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 01:19:00,329 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [750210043] [2019-11-07 01:19:00,330 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2019-11-07 01:19:00,330 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:19:00,331 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:19:00,331 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:19:00,331 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:19:00,363 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 32 for LOIs [2019-11-07 01:19:00,622 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2019-11-07 01:19:00,627 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 16 for LOIs [2019-11-07 01:19:00,629 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:19:01,910 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:19:01,910 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 16, 12, 11] total 52 [2019-11-07 01:19:01,911 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1542717466] [2019-11-07 01:19:01,912 INFO L442 AbstractCegarLoop]: Interpolant automaton has 52 states [2019-11-07 01:19:01,912 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:19:01,912 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2019-11-07 01:19:01,913 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=176, Invalid=2476, Unknown=0, NotChecked=0, Total=2652 [2019-11-07 01:19:01,913 INFO L87 Difference]: Start difference. First operand 31 states and 35 transitions. Second operand 52 states. [2019-11-07 01:19:02,755 WARN L191 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 67 DAG size of output: 61 [2019-11-07 01:19:02,938 WARN L191 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 80 DAG size of output: 46 [2019-11-07 01:19:03,225 WARN L191 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 97 DAG size of output: 50 [2019-11-07 01:19:03,474 WARN L191 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 94 DAG size of output: 56 [2019-11-07 01:19:03,681 WARN L191 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 78 DAG size of output: 50 [2019-11-07 01:19:03,858 WARN L191 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 68 DAG size of output: 44 [2019-11-07 01:19:04,035 WARN L191 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 51 [2019-11-07 01:19:04,405 WARN L191 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 99 DAG size of output: 49 [2019-11-07 01:19:04,656 WARN L191 SmtUtils]: Spent 181.00 ms on a formula simplification. DAG size of input: 89 DAG size of output: 69 [2019-11-07 01:19:04,883 WARN L191 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 102 DAG size of output: 57 [2019-11-07 01:19:05,074 WARN L191 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 78 DAG size of output: 54 [2019-11-07 01:19:05,257 WARN L191 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 65 DAG size of output: 33 [2019-11-07 01:19:06,184 WARN L191 SmtUtils]: Spent 225.00 ms on a formula simplification. DAG size of input: 102 DAG size of output: 82 [2019-11-07 01:19:06,457 WARN L191 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 69 DAG size of output: 44 [2019-11-07 01:19:06,892 WARN L191 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 72 DAG size of output: 48 [2019-11-07 01:19:07,285 WARN L191 SmtUtils]: Spent 199.00 ms on a formula simplification. DAG size of input: 94 DAG size of output: 69 [2019-11-07 01:19:07,555 WARN L191 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 80 DAG size of output: 53 [2019-11-07 01:19:07,962 WARN L191 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 68 DAG size of output: 48 [2019-11-07 01:19:09,838 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:19:09,839 INFO L93 Difference]: Finished difference Result 79 states and 94 transitions. [2019-11-07 01:19:09,845 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2019-11-07 01:19:09,845 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 30 [2019-11-07 01:19:09,846 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:19:09,846 INFO L225 Difference]: With dead ends: 79 [2019-11-07 01:19:09,847 INFO L226 Difference]: Without dead ends: 71 [2019-11-07 01:19:09,849 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 53 SyntacticMatches, 11 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2462 ImplicationChecksByTransitivity, 10.3s TimeCoverageRelationStatistics Valid=797, Invalid=7945, Unknown=0, NotChecked=0, Total=8742 [2019-11-07 01:19:09,850 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2019-11-07 01:19:09,859 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 42. [2019-11-07 01:19:09,859 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2019-11-07 01:19:09,860 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 50 transitions. [2019-11-07 01:19:09,860 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 50 transitions. Word has length 30 [2019-11-07 01:19:09,860 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:19:09,860 INFO L462 AbstractCegarLoop]: Abstraction has 42 states and 50 transitions. [2019-11-07 01:19:09,860 INFO L463 AbstractCegarLoop]: Interpolant automaton has 52 states. [2019-11-07 01:19:09,860 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 50 transitions. [2019-11-07 01:19:09,862 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2019-11-07 01:19:09,862 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:19:09,862 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 01:19:10,063 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:19:10,063 INFO L410 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:19:10,064 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:19:10,064 INFO L82 PathProgramCache]: Analyzing trace with hash -344141442, now seen corresponding path program 7 times [2019-11-07 01:19:10,064 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:19:10,064 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [496082977] [2019-11-07 01:19:10,064 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:19:10,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:19:10,225 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 01:19:10,226 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [496082977] [2019-11-07 01:19:10,226 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2146010846] [2019-11-07 01:19:10,226 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 01:19:10,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:19:10,323 INFO L256 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 10 conjunts are in the unsatisfiable core [2019-11-07 01:19:10,327 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:19:10,403 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 01:19:10,404 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:19:10,475 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 01:19:10,476 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [567693104] [2019-11-07 01:19:10,477 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2019-11-07 01:19:10,477 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:19:10,478 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:19:10,478 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:19:10,478 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:19:10,508 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 32 for LOIs [2019-11-07 01:19:10,730 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2019-11-07 01:19:10,735 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 16 for LOIs [2019-11-07 01:19:10,737 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:19:11,567 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:19:11,567 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11, 11] total 28 [2019-11-07 01:19:11,568 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [234127815] [2019-11-07 01:19:11,569 INFO L442 AbstractCegarLoop]: Interpolant automaton has 28 states [2019-11-07 01:19:11,569 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:19:11,569 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2019-11-07 01:19:11,569 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=643, Unknown=0, NotChecked=0, Total=756 [2019-11-07 01:19:11,570 INFO L87 Difference]: Start difference. First operand 42 states and 50 transitions. Second operand 28 states. [2019-11-07 01:19:12,950 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:19:12,950 INFO L93 Difference]: Finished difference Result 76 states and 92 transitions. [2019-11-07 01:19:12,951 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2019-11-07 01:19:12,951 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 31 [2019-11-07 01:19:12,951 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:19:12,952 INFO L225 Difference]: With dead ends: 76 [2019-11-07 01:19:12,952 INFO L226 Difference]: Without dead ends: 36 [2019-11-07 01:19:12,954 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 70 SyntacticMatches, 7 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 643 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=292, Invalid=1688, Unknown=0, NotChecked=0, Total=1980 [2019-11-07 01:19:12,954 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2019-11-07 01:19:12,963 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2019-11-07 01:19:12,963 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2019-11-07 01:19:12,964 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 40 transitions. [2019-11-07 01:19:12,964 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 40 transitions. Word has length 31 [2019-11-07 01:19:12,964 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:19:12,964 INFO L462 AbstractCegarLoop]: Abstraction has 36 states and 40 transitions. [2019-11-07 01:19:12,964 INFO L463 AbstractCegarLoop]: Interpolant automaton has 28 states. [2019-11-07 01:19:12,965 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 40 transitions. [2019-11-07 01:19:12,965 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2019-11-07 01:19:12,965 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:19:12,966 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 01:19:13,174 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:19:13,174 INFO L410 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:19:13,175 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:19:13,175 INFO L82 PathProgramCache]: Analyzing trace with hash -1011736431, now seen corresponding path program 8 times [2019-11-07 01:19:13,175 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:19:13,176 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [789199255] [2019-11-07 01:19:13,176 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:19:13,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:19:14,165 WARN L191 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 64 DAG size of output: 47 [2019-11-07 01:19:14,583 WARN L191 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 67 DAG size of output: 53 [2019-11-07 01:19:14,843 WARN L191 SmtUtils]: Spent 220.00 ms on a formula simplification. DAG size of input: 68 DAG size of output: 58 [2019-11-07 01:19:15,045 WARN L191 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 65 DAG size of output: 46 [2019-11-07 01:19:15,309 WARN L191 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 56 DAG size of output: 38 [2019-11-07 01:19:15,529 WARN L191 SmtUtils]: Spent 177.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 57 [2019-11-07 01:19:15,703 WARN L191 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 68 DAG size of output: 53 [2019-11-07 01:19:15,917 WARN L191 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 65 DAG size of output: 56 [2019-11-07 01:19:16,072 WARN L191 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 55 DAG size of output: 45 [2019-11-07 01:19:16,607 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 01:19:16,607 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [789199255] [2019-11-07 01:19:16,607 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [621922617] [2019-11-07 01:19:16,608 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 01:19:16,718 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-11-07 01:19:16,719 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 01:19:16,721 INFO L256 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 84 conjunts are in the unsatisfiable core [2019-11-07 01:19:16,737 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:19:17,890 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 4 proven. 40 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-11-07 01:19:17,890 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:19:19,928 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 44 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-11-07 01:19:19,928 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1837631185] [2019-11-07 01:19:19,929 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2019-11-07 01:19:19,930 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:19:19,930 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:19:19,930 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:19:19,930 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:19:19,960 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 32 for LOIs [2019-11-07 01:19:20,275 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2019-11-07 01:19:20,282 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 16 for LOIs [2019-11-07 01:19:20,284 INFO L180 IcfgInterpreter]: Interpretation finished