/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf --traceabstraction.trace.refinement.strategy SIFA_TAIPAN --sifa.abstract.domain CompoundDomain --rcfgbuilder.size.of.a.code.block LoopFreeBlock --sifa.call.summarizer TopInputCallSummarizer --sifa.fluid SizeLimitFluid --sifa.simplification.technique SIMPLIFY_QUICK -i ../../../trunk/examples/svcomp/array-examples/standard_sentinel.i.v+cfa-reducer.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-fb55353 [2019-11-07 01:26:33,362 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-07 01:26:33,364 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-07 01:26:33,375 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-11-07 01:26:33,376 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-11-07 01:26:33,378 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-11-07 01:26:33,379 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-11-07 01:26:33,390 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-11-07 01:26:33,393 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-11-07 01:26:33,394 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-11-07 01:26:33,396 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-11-07 01:26:33,397 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-11-07 01:26:33,397 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-07 01:26:33,398 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-07 01:26:33,401 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-07 01:26:33,403 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-07 01:26:33,404 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-07 01:26:33,405 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-07 01:26:33,409 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-07 01:26:33,412 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-07 01:26:33,416 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-07 01:26:33,418 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-07 01:26:33,419 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-07 01:26:33,422 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-07 01:26:33,424 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-11-07 01:26:33,436 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-07 01:26:33,437 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-07 01:26:33,438 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-07 01:26:33,439 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 01:26:33,461 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-07 01:26:33,461 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-07 01:26:33,463 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-07 01:26:33,463 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-07 01:26:33,463 INFO L138 SettingsManager]: * Use SBE=true [2019-11-07 01:26:33,463 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-07 01:26:33,464 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-07 01:26:33,464 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-07 01:26:33,464 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-07 01:26:33,464 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-07 01:26:33,464 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-07 01:26:33,465 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-07 01:26:33,465 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-07 01:26:33,465 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-07 01:26:33,465 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-07 01:26:33,465 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-07 01:26:33,466 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-07 01:26:33,466 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-07 01:26:33,466 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-07 01:26:33,466 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-07 01:26:33,467 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-07 01:26:33,467 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-07 01:26:33,467 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-07 01:26:33,467 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-07 01:26:33,467 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-07 01:26:33,468 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-07 01:26:33,468 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-07 01:26:33,468 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-07 01:26:33,468 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 01:26:33,752 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-07 01:26:33,764 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-07 01:26:33,768 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-07 01:26:33,769 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-07 01:26:33,769 INFO L275 PluginConnector]: CDTParser initialized [2019-11-07 01:26:33,770 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-examples/standard_sentinel.i.v+cfa-reducer.c [2019-11-07 01:26:33,830 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e6474a575/0e11a4cad5244143954732f6d22ddc0f/FLAG6011afbc3 [2019-11-07 01:26:34,261 INFO L306 CDTParser]: Found 1 translation units. [2019-11-07 01:26:34,262 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-examples/standard_sentinel.i.v+cfa-reducer.c [2019-11-07 01:26:34,269 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e6474a575/0e11a4cad5244143954732f6d22ddc0f/FLAG6011afbc3 [2019-11-07 01:26:34,618 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e6474a575/0e11a4cad5244143954732f6d22ddc0f [2019-11-07 01:26:34,649 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-07 01:26:34,653 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-11-07 01:26:34,656 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-07 01:26:34,656 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-07 01:26:34,663 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-07 01:26:34,664 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:26:34" (1/1) ... [2019-11-07 01:26:34,672 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@19891321 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:26:34, skipping insertion in model container [2019-11-07 01:26:34,672 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:26:34" (1/1) ... [2019-11-07 01:26:34,691 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-11-07 01:26:34,715 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-11-07 01:26:34,949 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-07 01:26:34,954 INFO L188 MainTranslator]: Completed pre-run [2019-11-07 01:26:34,974 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-07 01:26:34,990 INFO L192 MainTranslator]: Completed translation [2019-11-07 01:26:34,990 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:26:34 WrapperNode [2019-11-07 01:26:34,991 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-07 01:26:34,991 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-07 01:26:34,991 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-07 01:26:34,991 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-07 01:26:35,086 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:26:34" (1/1) ... [2019-11-07 01:26:35,086 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:26:34" (1/1) ... [2019-11-07 01:26:35,093 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:26:34" (1/1) ... [2019-11-07 01:26:35,093 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:26:34" (1/1) ... [2019-11-07 01:26:35,100 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:26:34" (1/1) ... [2019-11-07 01:26:35,108 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:26:34" (1/1) ... [2019-11-07 01:26:35,111 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:26:34" (1/1) ... [2019-11-07 01:26:35,113 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-07 01:26:35,113 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-07 01:26:35,114 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-07 01:26:35,114 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-07 01:26:35,115 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:26:34" (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 01:26:35,164 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-11-07 01:26:35,166 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-07 01:26:35,166 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-11-07 01:26:35,166 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-11-07 01:26:35,166 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-11-07 01:26:35,167 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-11-07 01:26:35,167 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-11-07 01:26:35,168 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-11-07 01:26:35,168 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-11-07 01:26:35,168 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-11-07 01:26:35,168 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-11-07 01:26:35,170 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-11-07 01:26:35,170 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-07 01:26:35,409 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-07 01:26:35,409 INFO L284 CfgBuilder]: Removed 1 assume(true) statements. [2019-11-07 01:26:35,411 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:26:35 BoogieIcfgContainer [2019-11-07 01:26:35,411 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-07 01:26:35,412 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-07 01:26:35,413 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-07 01:26:35,416 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-07 01:26:35,416 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 01:26:34" (1/3) ... [2019-11-07 01:26:35,417 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4b8fbecb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:26:35, skipping insertion in model container [2019-11-07 01:26:35,417 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:26:34" (2/3) ... [2019-11-07 01:26:35,417 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4b8fbecb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:26:35, skipping insertion in model container [2019-11-07 01:26:35,418 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:26:35" (3/3) ... [2019-11-07 01:26:35,419 INFO L109 eAbstractionObserver]: Analyzing ICFG standard_sentinel.i.v+cfa-reducer.c [2019-11-07 01:26:35,429 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-07 01:26:35,437 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-07 01:26:35,449 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-07 01:26:35,496 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-07 01:26:35,496 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-07 01:26:35,496 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-07 01:26:35,496 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-07 01:26:35,497 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-07 01:26:35,497 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-07 01:26:35,497 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-07 01:26:35,497 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-07 01:26:35,519 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2019-11-07 01:26:35,525 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2019-11-07 01:26:35,526 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:26:35,527 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:26:35,529 INFO L410 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:26:35,535 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:26:35,536 INFO L82 PathProgramCache]: Analyzing trace with hash 882124697, now seen corresponding path program 1 times [2019-11-07 01:26:35,549 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:26:35,550 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2029790452] [2019-11-07 01:26:35,550 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:26:35,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:26:35,883 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 01:26:35,884 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2029790452] [2019-11-07 01:26:35,885 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-07 01:26:35,885 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-07 01:26:35,886 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1775101928] [2019-11-07 01:26:35,891 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-07 01:26:35,892 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:26:35,913 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-07 01:26:35,914 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-07 01:26:35,917 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 3 states. [2019-11-07 01:26:35,965 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:26:35,966 INFO L93 Difference]: Finished difference Result 29 states and 37 transitions. [2019-11-07 01:26:35,969 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-07 01:26:35,970 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 12 [2019-11-07 01:26:35,971 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:26:35,985 INFO L225 Difference]: With dead ends: 29 [2019-11-07 01:26:35,986 INFO L226 Difference]: Without dead ends: 14 [2019-11-07 01:26:35,990 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 01:26:36,009 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2019-11-07 01:26:36,026 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2019-11-07 01:26:36,028 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2019-11-07 01:26:36,029 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2019-11-07 01:26:36,031 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 12 [2019-11-07 01:26:36,031 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:26:36,031 INFO L462 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2019-11-07 01:26:36,032 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-07 01:26:36,032 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2019-11-07 01:26:36,032 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2019-11-07 01:26:36,033 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:26:36,033 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:26:36,033 INFO L410 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:26:36,034 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:26:36,034 INFO L82 PathProgramCache]: Analyzing trace with hash 1345624393, now seen corresponding path program 1 times [2019-11-07 01:26:36,034 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:26:36,035 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [792661308] [2019-11-07 01:26:36,035 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:26:36,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:26:36,148 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 01:26:36,151 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [792661308] [2019-11-07 01:26:36,151 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-07 01:26:36,151 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-11-07 01:26:36,152 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [366206348] [2019-11-07 01:26:36,153 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-11-07 01:26:36,156 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:26:36,156 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-11-07 01:26:36,157 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2019-11-07 01:26:36,157 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand 5 states. [2019-11-07 01:26:36,220 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:26:36,221 INFO L93 Difference]: Finished difference Result 19 states and 20 transitions. [2019-11-07 01:26:36,222 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-11-07 01:26:36,222 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2019-11-07 01:26:36,222 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:26:36,223 INFO L225 Difference]: With dead ends: 19 [2019-11-07 01:26:36,223 INFO L226 Difference]: Without dead ends: 16 [2019-11-07 01:26:36,224 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2019-11-07 01:26:36,225 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2019-11-07 01:26:36,230 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2019-11-07 01:26:36,230 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2019-11-07 01:26:36,232 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 17 transitions. [2019-11-07 01:26:36,232 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 17 transitions. Word has length 13 [2019-11-07 01:26:36,233 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:26:36,233 INFO L462 AbstractCegarLoop]: Abstraction has 16 states and 17 transitions. [2019-11-07 01:26:36,233 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-11-07 01:26:36,233 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 17 transitions. [2019-11-07 01:26:36,234 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-11-07 01:26:36,234 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:26:36,235 INFO L410 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:26:36,235 INFO L410 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:26:36,235 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:26:36,236 INFO L82 PathProgramCache]: Analyzing trace with hash 357797452, now seen corresponding path program 1 times [2019-11-07 01:26:36,236 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:26:36,237 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [377832565] [2019-11-07 01:26:36,237 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:26:36,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:26:36,327 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-07 01:26:36,327 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [377832565] [2019-11-07 01:26:36,328 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [428033743] [2019-11-07 01:26:36,328 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 01:26:36,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:26:36,392 INFO L256 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-07 01:26:36,398 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:26:36,429 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-07 01:26:36,430 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:26:36,467 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-07 01:26:36,467 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1906940913] [2019-11-07 01:26:36,522 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2019-11-07 01:26:36,523 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:26:36,531 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:26:36,538 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:26:36,539 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:26:36,682 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 29 for LOIs [2019-11-07 01:26:36,985 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 16 for LOIs [2019-11-07 01:26:36,988 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:26:37,349 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:26:37,350 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 11] total 17 [2019-11-07 01:26:37,351 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [160022393] [2019-11-07 01:26:37,351 INFO L442 AbstractCegarLoop]: Interpolant automaton has 17 states [2019-11-07 01:26:37,352 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:26:37,352 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2019-11-07 01:26:37,353 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=215, Unknown=0, NotChecked=0, Total=272 [2019-11-07 01:26:37,353 INFO L87 Difference]: Start difference. First operand 16 states and 17 transitions. Second operand 17 states. [2019-11-07 01:26:37,818 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:26:37,818 INFO L93 Difference]: Finished difference Result 28 states and 32 transitions. [2019-11-07 01:26:37,819 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2019-11-07 01:26:37,819 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 15 [2019-11-07 01:26:37,819 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:26:37,820 INFO L225 Difference]: With dead ends: 28 [2019-11-07 01:26:37,820 INFO L226 Difference]: Without dead ends: 19 [2019-11-07 01:26:37,822 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 172 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=142, Invalid=614, Unknown=0, NotChecked=0, Total=756 [2019-11-07 01:26:37,823 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2019-11-07 01:26:37,830 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2019-11-07 01:26:37,830 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2019-11-07 01:26:37,832 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2019-11-07 01:26:37,832 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 15 [2019-11-07 01:26:37,832 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:26:37,832 INFO L462 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2019-11-07 01:26:37,832 INFO L463 AbstractCegarLoop]: Interpolant automaton has 17 states. [2019-11-07 01:26:37,833 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2019-11-07 01:26:37,835 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2019-11-07 01:26:37,835 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:26:37,835 INFO L410 BasicCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:26:38,041 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:26:38,042 INFO L410 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:26:38,042 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:26:38,042 INFO L82 PathProgramCache]: Analyzing trace with hash -1083919204, now seen corresponding path program 2 times [2019-11-07 01:26:38,043 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:26:38,043 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [270682380] [2019-11-07 01:26:38,044 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:26:38,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:26:38,134 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-07 01:26:38,136 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [270682380] [2019-11-07 01:26:38,136 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [136972307] [2019-11-07 01:26:38,137 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 01:26:38,189 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2019-11-07 01:26:38,190 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 01:26:38,191 INFO L256 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 13 conjunts are in the unsatisfiable core [2019-11-07 01:26:38,193 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:26:38,330 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-11-07 01:26:38,330 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:26:38,463 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-11-07 01:26:38,464 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [887574236] [2019-11-07 01:26:38,465 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2019-11-07 01:26:38,468 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:26:38,468 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:26:38,469 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:26:38,469 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:26:38,519 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 31 for LOIs [2019-11-07 01:26:38,686 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 16 for LOIs [2019-11-07 01:26:38,688 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:26:39,086 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:26:39,086 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 11] total 26 [2019-11-07 01:26:39,087 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1252252583] [2019-11-07 01:26:39,088 INFO L442 AbstractCegarLoop]: Interpolant automaton has 26 states [2019-11-07 01:26:39,088 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:26:39,089 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2019-11-07 01:26:39,089 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=557, Unknown=0, NotChecked=0, Total=650 [2019-11-07 01:26:39,089 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand 26 states. [2019-11-07 01:26:40,006 WARN L191 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 45 DAG size of output: 38 [2019-11-07 01:26:40,408 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:26:40,408 INFO L93 Difference]: Finished difference Result 35 states and 39 transitions. [2019-11-07 01:26:40,412 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2019-11-07 01:26:40,412 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 18 [2019-11-07 01:26:40,413 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:26:40,413 INFO L225 Difference]: With dead ends: 35 [2019-11-07 01:26:40,413 INFO L226 Difference]: Without dead ends: 24 [2019-11-07 01:26:40,419 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 445 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=330, Invalid=1740, Unknown=0, NotChecked=0, Total=2070 [2019-11-07 01:26:40,419 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2019-11-07 01:26:40,434 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2019-11-07 01:26:40,435 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2019-11-07 01:26:40,435 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2019-11-07 01:26:40,436 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 18 [2019-11-07 01:26:40,436 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:26:40,436 INFO L462 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2019-11-07 01:26:40,436 INFO L463 AbstractCegarLoop]: Interpolant automaton has 26 states. [2019-11-07 01:26:40,436 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2019-11-07 01:26:40,439 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2019-11-07 01:26:40,439 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:26:40,439 INFO L410 BasicCegarLoop]: trace histogram [5, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:26:40,644 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:26:40,645 INFO L410 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:26:40,645 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:26:40,645 INFO L82 PathProgramCache]: Analyzing trace with hash 1250401810, now seen corresponding path program 3 times [2019-11-07 01:26:40,645 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:26:40,646 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2141176669] [2019-11-07 01:26:40,647 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:26:40,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:26:40,798 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2019-11-07 01:26:40,799 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2141176669] [2019-11-07 01:26:40,799 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [160867517] [2019-11-07 01:26:40,799 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 01:26:40,863 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-07 01:26:40,863 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 01:26:40,865 INFO L256 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 7 conjunts are in the unsatisfiable core [2019-11-07 01:26:40,869 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:26:40,886 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2019-11-07 01:26:40,887 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:26:40,954 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2019-11-07 01:26:40,954 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [157844371] [2019-11-07 01:26:40,956 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2019-11-07 01:26:40,956 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:26:40,957 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:26:40,957 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:26:40,957 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:26:40,982 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 29 for LOIs [2019-11-07 01:26:41,087 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 16 for LOIs [2019-11-07 01:26:41,090 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:26:41,348 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:26:41,348 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 11] total 25 [2019-11-07 01:26:41,349 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [989469146] [2019-11-07 01:26:41,350 INFO L442 AbstractCegarLoop]: Interpolant automaton has 25 states [2019-11-07 01:26:41,350 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:26:41,350 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2019-11-07 01:26:41,351 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=459, Unknown=0, NotChecked=0, Total=600 [2019-11-07 01:26:41,351 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 25 states. [2019-11-07 01:26:42,047 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:26:42,047 INFO L93 Difference]: Finished difference Result 44 states and 52 transitions. [2019-11-07 01:26:42,048 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2019-11-07 01:26:42,049 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 23 [2019-11-07 01:26:42,049 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:26:42,050 INFO L225 Difference]: With dead ends: 44 [2019-11-07 01:26:42,050 INFO L226 Difference]: Without dead ends: 31 [2019-11-07 01:26:42,052 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 53 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 510 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=378, Invalid=1514, Unknown=0, NotChecked=0, Total=1892 [2019-11-07 01:26:42,052 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2019-11-07 01:26:42,057 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2019-11-07 01:26:42,057 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2019-11-07 01:26:42,058 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 32 transitions. [2019-11-07 01:26:42,059 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 32 transitions. Word has length 23 [2019-11-07 01:26:42,059 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:26:42,059 INFO L462 AbstractCegarLoop]: Abstraction has 31 states and 32 transitions. [2019-11-07 01:26:42,059 INFO L463 AbstractCegarLoop]: Interpolant automaton has 25 states. [2019-11-07 01:26:42,059 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 32 transitions. [2019-11-07 01:26:42,060 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2019-11-07 01:26:42,060 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:26:42,060 INFO L410 BasicCegarLoop]: trace histogram [12, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:26:42,265 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:26:42,266 INFO L410 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:26:42,266 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:26:42,266 INFO L82 PathProgramCache]: Analyzing trace with hash -900767646, now seen corresponding path program 4 times [2019-11-07 01:26:42,266 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:26:42,267 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [366972522] [2019-11-07 01:26:42,267 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:26:42,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:26:42,455 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2019-11-07 01:26:42,456 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [366972522] [2019-11-07 01:26:42,457 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [88536237] [2019-11-07 01:26:42,457 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 01:26:42,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:26:42,513 INFO L256 TraceCheckSpWp]: Trace formula consists of 164 conjuncts, 14 conjunts are in the unsatisfiable core [2019-11-07 01:26:42,515 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:26:42,540 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2019-11-07 01:26:42,540 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:26:42,801 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2019-11-07 01:26:42,802 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1707888324] [2019-11-07 01:26:42,803 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2019-11-07 01:26:42,803 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:26:42,804 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:26:42,804 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:26:42,804 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:26:42,834 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 31 for LOIs [2019-11-07 01:26:42,940 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 16 for LOIs [2019-11-07 01:26:42,943 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:26:43,247 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:26:43,248 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15, 11] total 39 [2019-11-07 01:26:43,248 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1786604643] [2019-11-07 01:26:43,249 INFO L442 AbstractCegarLoop]: Interpolant automaton has 39 states [2019-11-07 01:26:43,249 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:26:43,249 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2019-11-07 01:26:43,250 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=442, Invalid=1040, Unknown=0, NotChecked=0, Total=1482 [2019-11-07 01:26:43,250 INFO L87 Difference]: Start difference. First operand 31 states and 32 transitions. Second operand 39 states. [2019-11-07 01:26:44,580 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:26:44,581 INFO L93 Difference]: Finished difference Result 58 states and 73 transitions. [2019-11-07 01:26:44,581 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2019-11-07 01:26:44,581 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 30 [2019-11-07 01:26:44,582 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:26:44,582 INFO L225 Difference]: With dead ends: 58 [2019-11-07 01:26:44,582 INFO L226 Difference]: Without dead ends: 45 [2019-11-07 01:26:44,585 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 67 SyntacticMatches, 0 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1294 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1253, Invalid=3859, Unknown=0, NotChecked=0, Total=5112 [2019-11-07 01:26:44,585 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2019-11-07 01:26:44,592 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2019-11-07 01:26:44,592 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2019-11-07 01:26:44,593 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 46 transitions. [2019-11-07 01:26:44,593 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 46 transitions. Word has length 30 [2019-11-07 01:26:44,594 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:26:44,594 INFO L462 AbstractCegarLoop]: Abstraction has 45 states and 46 transitions. [2019-11-07 01:26:44,594 INFO L463 AbstractCegarLoop]: Interpolant automaton has 39 states. [2019-11-07 01:26:44,594 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 46 transitions. [2019-11-07 01:26:44,595 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2019-11-07 01:26:44,595 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:26:44,596 INFO L410 BasicCegarLoop]: trace histogram [26, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:26:44,799 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:26:44,800 INFO L410 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:26:44,800 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:26:44,801 INFO L82 PathProgramCache]: Analyzing trace with hash -1717249438, now seen corresponding path program 5 times [2019-11-07 01:26:44,801 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:26:44,802 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1615126853] [2019-11-07 01:26:44,802 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:26:44,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:26:45,224 INFO L134 CoverageAnalysis]: Checked inductivity of 363 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2019-11-07 01:26:45,225 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1615126853] [2019-11-07 01:26:45,225 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [289575950] [2019-11-07 01:26:45,225 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 01:26:45,293 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2019-11-07 01:26:45,294 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 01:26:45,295 INFO L256 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 26 conjunts are in the unsatisfiable core [2019-11-07 01:26:45,298 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:26:45,764 INFO L134 CoverageAnalysis]: Checked inductivity of 363 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 351 trivial. 0 not checked. [2019-11-07 01:26:45,764 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:26:46,133 INFO L134 CoverageAnalysis]: Checked inductivity of 363 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 351 trivial. 0 not checked. [2019-11-07 01:26:46,134 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [80403866] [2019-11-07 01:26:46,135 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2019-11-07 01:26:46,135 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:26:46,136 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:26:46,136 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:26:46,136 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:26:46,173 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 31 for LOIs [2019-11-07 01:26:46,300 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 16 for LOIs [2019-11-07 01:26:46,301 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:26:46,898 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:26:46,899 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 11, 11, 11] total 56 [2019-11-07 01:26:46,899 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [584619739] [2019-11-07 01:26:46,900 INFO L442 AbstractCegarLoop]: Interpolant automaton has 56 states [2019-11-07 01:26:46,900 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:26:46,901 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2019-11-07 01:26:46,902 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=532, Invalid=2548, Unknown=0, NotChecked=0, Total=3080 [2019-11-07 01:26:46,902 INFO L87 Difference]: Start difference. First operand 45 states and 46 transitions. Second operand 56 states. [2019-11-07 01:26:49,655 WARN L191 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 86 DAG size of output: 47 [2019-11-07 01:26:50,029 WARN L191 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 67 [2019-11-07 01:26:50,453 WARN L191 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 57 DAG size of output: 42 [2019-11-07 01:26:51,477 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:26:51,478 INFO L93 Difference]: Finished difference Result 69 states and 75 transitions. [2019-11-07 01:26:51,478 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2019-11-07 01:26:51,478 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 44 [2019-11-07 01:26:51,479 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:26:51,480 INFO L225 Difference]: With dead ends: 69 [2019-11-07 01:26:51,480 INFO L226 Difference]: Without dead ends: 54 [2019-11-07 01:26:51,484 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 210 GetRequests, 105 SyntacticMatches, 1 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2713 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=1746, Invalid=9384, Unknown=0, NotChecked=0, Total=11130 [2019-11-07 01:26:51,484 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2019-11-07 01:26:51,491 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2019-11-07 01:26:51,491 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2019-11-07 01:26:51,492 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 55 transitions. [2019-11-07 01:26:51,492 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 55 transitions. Word has length 44 [2019-11-07 01:26:51,492 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:26:51,492 INFO L462 AbstractCegarLoop]: Abstraction has 54 states and 55 transitions. [2019-11-07 01:26:51,492 INFO L463 AbstractCegarLoop]: Interpolant automaton has 56 states. [2019-11-07 01:26:51,493 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 55 transitions. [2019-11-07 01:26:51,494 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2019-11-07 01:26:51,494 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:26:51,494 INFO L410 BasicCegarLoop]: trace histogram [27, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:26:51,696 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:26:51,697 INFO L410 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:26:51,697 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:26:51,697 INFO L82 PathProgramCache]: Analyzing trace with hash -1906505058, now seen corresponding path program 6 times [2019-11-07 01:26:51,700 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:26:51,700 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [570058103] [2019-11-07 01:26:51,700 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:26:51,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:26:52,188 INFO L134 CoverageAnalysis]: Checked inductivity of 434 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2019-11-07 01:26:52,189 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [570058103] [2019-11-07 01:26:52,189 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1892417447] [2019-11-07 01:26:52,189 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 01:26:52,280 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-07 01:26:52,280 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 01:26:52,281 INFO L256 TraceCheckSpWp]: Trace formula consists of 274 conjuncts, 29 conjunts are in the unsatisfiable core [2019-11-07 01:26:52,284 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:26:52,299 INFO L134 CoverageAnalysis]: Checked inductivity of 434 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2019-11-07 01:26:52,300 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:26:53,175 INFO L134 CoverageAnalysis]: Checked inductivity of 434 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2019-11-07 01:26:53,175 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [526101273] [2019-11-07 01:26:53,177 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2019-11-07 01:26:53,177 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:26:53,178 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:26:53,178 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:26:53,178 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:26:53,200 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 29 for LOIs [2019-11-07 01:26:53,282 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 16 for LOIs [2019-11-07 01:26:53,283 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:26:53,650 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:26:53,651 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30, 11] total 69 [2019-11-07 01:26:53,651 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2036838940] [2019-11-07 01:26:53,652 INFO L442 AbstractCegarLoop]: Interpolant automaton has 69 states [2019-11-07 01:26:53,652 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:26:53,653 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2019-11-07 01:26:53,655 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1747, Invalid=2945, Unknown=0, NotChecked=0, Total=4692 [2019-11-07 01:26:53,656 INFO L87 Difference]: Start difference. First operand 54 states and 55 transitions. Second operand 69 states. [2019-11-07 01:26:57,058 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:26:57,058 INFO L93 Difference]: Finished difference Result 104 states and 134 transitions. [2019-11-07 01:26:57,059 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2019-11-07 01:26:57,059 INFO L78 Accepts]: Start accepts. Automaton has 69 states. Word has length 53 [2019-11-07 01:26:57,060 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:26:57,060 INFO L225 Difference]: With dead ends: 104 [2019-11-07 01:26:57,061 INFO L226 Difference]: Without dead ends: 83 [2019-11-07 01:26:57,065 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 251 GetRequests, 121 SyntacticMatches, 0 SemanticMatches, 130 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3799 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=5108, Invalid=12184, Unknown=0, NotChecked=0, Total=17292 [2019-11-07 01:26:57,066 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2019-11-07 01:26:57,075 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 83. [2019-11-07 01:26:57,076 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2019-11-07 01:26:57,077 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 84 transitions. [2019-11-07 01:26:57,077 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 84 transitions. Word has length 53 [2019-11-07 01:26:57,077 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:26:57,077 INFO L462 AbstractCegarLoop]: Abstraction has 83 states and 84 transitions. [2019-11-07 01:26:57,078 INFO L463 AbstractCegarLoop]: Interpolant automaton has 69 states. [2019-11-07 01:26:57,078 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 84 transitions. [2019-11-07 01:26:57,079 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2019-11-07 01:26:57,079 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:26:57,079 INFO L410 BasicCegarLoop]: trace histogram [56, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:26:57,285 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:26:57,285 INFO L410 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:26:57,285 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:26:57,286 INFO L82 PathProgramCache]: Analyzing trace with hash 1261810414, now seen corresponding path program 7 times [2019-11-07 01:26:57,286 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:26:57,286 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1465026625] [2019-11-07 01:26:57,286 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:26:57,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:26:58,618 INFO L134 CoverageAnalysis]: Checked inductivity of 1652 backedges. 0 proven. 1596 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2019-11-07 01:26:58,619 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1465026625] [2019-11-07 01:26:58,619 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [30087172] [2019-11-07 01:26:58,619 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 01:26:58,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:26:58,745 INFO L256 TraceCheckSpWp]: Trace formula consists of 448 conjuncts, 58 conjunts are in the unsatisfiable core [2019-11-07 01:26:58,749 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:26:58,783 INFO L134 CoverageAnalysis]: Checked inductivity of 1652 backedges. 0 proven. 1596 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2019-11-07 01:26:58,783 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:27:02,652 INFO L134 CoverageAnalysis]: Checked inductivity of 1652 backedges. 0 proven. 1596 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2019-11-07 01:27:02,653 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1532526345] [2019-11-07 01:27:02,654 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2019-11-07 01:27:02,654 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:27:02,655 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:27:02,655 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:27:02,655 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:27:02,679 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 31 for LOIs [2019-11-07 01:27:02,749 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 16 for LOIs [2019-11-07 01:27:02,751 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:27:03,282 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:27:03,283 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 59, 59, 11] total 127 [2019-11-07 01:27:03,283 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [346291586] [2019-11-07 01:27:03,285 INFO L442 AbstractCegarLoop]: Interpolant automaton has 127 states [2019-11-07 01:27:03,285 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:27:03,286 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 127 interpolants. [2019-11-07 01:27:03,291 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6822, Invalid=9180, Unknown=0, NotChecked=0, Total=16002 [2019-11-07 01:27:03,291 INFO L87 Difference]: Start difference. First operand 83 states and 84 transitions. Second operand 127 states. [2019-11-07 01:27:13,159 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:27:13,159 INFO L93 Difference]: Finished difference Result 162 states and 221 transitions. [2019-11-07 01:27:13,160 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 126 states. [2019-11-07 01:27:13,160 INFO L78 Accepts]: Start accepts. Automaton has 127 states. Word has length 82 [2019-11-07 01:27:13,160 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:27:13,162 INFO L225 Difference]: With dead ends: 162 [2019-11-07 01:27:13,162 INFO L226 Difference]: Without dead ends: 141 [2019-11-07 01:27:13,169 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 425 GetRequests, 179 SyntacticMatches, 0 SemanticMatches, 246 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11832 ImplicationChecksByTransitivity, 14.9s TimeCoverageRelationStatistics Valid=20217, Invalid=41039, Unknown=0, NotChecked=0, Total=61256 [2019-11-07 01:27:13,169 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2019-11-07 01:27:13,183 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 141. [2019-11-07 01:27:13,183 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 141 states. [2019-11-07 01:27:13,185 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 142 transitions. [2019-11-07 01:27:13,185 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 142 transitions. Word has length 82 [2019-11-07 01:27:13,185 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:27:13,186 INFO L462 AbstractCegarLoop]: Abstraction has 141 states and 142 transitions. [2019-11-07 01:27:13,186 INFO L463 AbstractCegarLoop]: Interpolant automaton has 127 states. [2019-11-07 01:27:13,186 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 142 transitions. [2019-11-07 01:27:13,188 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2019-11-07 01:27:13,188 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:27:13,188 INFO L410 BasicCegarLoop]: trace histogram [114, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:27:13,398 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:27:13,399 INFO L410 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:27:13,399 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:27:13,399 INFO L82 PathProgramCache]: Analyzing trace with hash 1778012398, now seen corresponding path program 8 times [2019-11-07 01:27:13,399 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:27:13,400 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1171428007] [2019-11-07 01:27:13,400 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:27:13,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat