/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/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-32bit-Taipan_Default.epf -i ../../../trunk/examples/svcomp/array-tiling/rewnifrev2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-6598664 [2019-11-23 23:28:48,382 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-23 23:28:48,385 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-23 23:28:48,403 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2019-11-23 23:28:48,462 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-23 23:28:48,462 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-23 23:28:48,464 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-23 23:28:48,464 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-32bit-Taipan_Default.epf [2019-11-23 23:28:48,497 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-23 23:28:48,501 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-23 23:28:48,502 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2019-11-23 23:28:48,502 INFO L138 SettingsManager]: * User list type=DISABLED [2019-11-23 23:28:48,502 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2019-11-23 23:28:48,502 INFO L138 SettingsManager]: * Explicit value domain=true [2019-11-23 23:28:48,502 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2019-11-23 23:28:48,503 INFO L138 SettingsManager]: * Octagon Domain=false [2019-11-23 23:28:48,503 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2019-11-23 23:28:48,503 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2019-11-23 23:28:48,503 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2019-11-23 23:28:48,503 INFO L138 SettingsManager]: * Interval Domain=false [2019-11-23 23:28:48,505 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2019-11-23 23:28:48,505 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2019-11-23 23:28:48,505 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2019-11-23 23:28:48,506 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-23 23:28:48,506 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-23 23:28:48,506 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-23 23:28:48,506 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-23 23:28:48,507 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-23 23:28:48,507 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-23 23:28:48,507 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-23 23:28:48,507 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-23 23:28:48,507 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-23 23:28:48,508 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-23 23:28:48,508 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-23 23:28:48,508 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-23 23:28:48,509 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-23 23:28:48,509 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-23 23:28:48,509 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-23 23:28:48,509 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-23 23:28:48,509 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-23 23:28:48,510 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-23 23:28:48,510 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2019-11-23 23:28:48,510 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-23 23:28:48,510 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-23 23:28:48,510 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-11-23 23:28:48,510 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2019-11-23 23:28:48,757 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-23 23:28:48,766 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-23 23:28:48,773 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-23 23:28:48,774 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-23 23:28:48,774 INFO L275 PluginConnector]: CDTParser initialized [2019-11-23 23:28:48,774 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-tiling/rewnifrev2.c [2019-11-23 23:28:48,851 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1ddf4e47d/fa2abdd1de3747749c09c0086441e806/FLAG5ec232ba5 [2019-11-23 23:28:49,263 INFO L306 CDTParser]: Found 1 translation units. [2019-11-23 23:28:49,263 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-tiling/rewnifrev2.c [2019-11-23 23:28:49,269 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1ddf4e47d/fa2abdd1de3747749c09c0086441e806/FLAG5ec232ba5 [2019-11-23 23:28:49,645 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1ddf4e47d/fa2abdd1de3747749c09c0086441e806 [2019-11-23 23:28:49,655 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-23 23:28:49,657 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2019-11-23 23:28:49,658 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-23 23:28:49,658 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-23 23:28:49,661 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-23 23:28:49,662 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 11:28:49" (1/1) ... [2019-11-23 23:28:49,665 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@397ebe0b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 11:28:49, skipping insertion in model container [2019-11-23 23:28:49,665 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 11:28:49" (1/1) ... [2019-11-23 23:28:49,673 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2019-11-23 23:28:49,695 INFO L178 MainTranslator]: Built tables and reachable declarations [2019-11-23 23:28:49,897 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-23 23:28:49,907 INFO L203 MainTranslator]: Completed pre-run [2019-11-23 23:28:49,921 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-23 23:28:49,936 INFO L208 MainTranslator]: Completed translation [2019-11-23 23:28:49,937 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 11:28:49 WrapperNode [2019-11-23 23:28:49,937 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-23 23:28:49,938 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2019-11-23 23:28:49,938 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2019-11-23 23:28:49,938 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2019-11-23 23:28:49,947 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 11:28:49" (1/1) ... [2019-11-23 23:28:49,954 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 11:28:49" (1/1) ... [2019-11-23 23:28:50,055 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2019-11-23 23:28:50,056 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-23 23:28:50,056 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-23 23:28:50,056 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-23 23:28:50,065 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 11:28:49" (1/1) ... [2019-11-23 23:28:50,066 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 11:28:49" (1/1) ... [2019-11-23 23:28:50,073 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 11:28:49" (1/1) ... [2019-11-23 23:28:50,073 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 11:28:49" (1/1) ... [2019-11-23 23:28:50,078 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 11:28:49" (1/1) ... [2019-11-23 23:28:50,083 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 11:28:49" (1/1) ... [2019-11-23 23:28:50,084 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 11:28:49" (1/1) ... [2019-11-23 23:28:50,086 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-23 23:28:50,086 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-23 23:28:50,086 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-23 23:28:50,086 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-23 23:28:50,087 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 11:28:49" (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 [2019-11-23 23:28:50,144 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-11-23 23:28:50,147 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2019-11-23 23:28:50,147 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-23 23:28:50,148 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-23 23:28:50,148 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-11-23 23:28:50,471 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-23 23:28:50,471 INFO L284 CfgBuilder]: Removed 8 assume(true) statements. [2019-11-23 23:28:50,472 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 11:28:50 BoogieIcfgContainer [2019-11-23 23:28:50,472 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-23 23:28:50,474 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-23 23:28:50,474 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-23 23:28:50,477 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-23 23:28:50,477 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 11:28:49" (1/3) ... [2019-11-23 23:28:50,478 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7281e60a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 11:28:50, skipping insertion in model container [2019-11-23 23:28:50,478 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 11:28:49" (2/3) ... [2019-11-23 23:28:50,478 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7281e60a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 11:28:50, skipping insertion in model container [2019-11-23 23:28:50,479 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 11:28:50" (3/3) ... [2019-11-23 23:28:50,480 INFO L109 eAbstractionObserver]: Analyzing ICFG rewnifrev2.c [2019-11-23 23:28:50,490 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-23 23:28:50,497 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-23 23:28:50,508 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-23 23:28:50,528 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-23 23:28:50,528 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-23 23:28:50,528 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-23 23:28:50,528 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-23 23:28:50,528 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-23 23:28:50,528 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-23 23:28:50,528 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-23 23:28:50,529 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-23 23:28:50,540 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states. [2019-11-23 23:28:50,545 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2019-11-23 23:28:50,545 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 23:28:50,546 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2019-11-23 23:28:50,546 INFO L410 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 23:28:50,550 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 23:28:50,550 INFO L82 PathProgramCache]: Analyzing trace with hash -1969693255, now seen corresponding path program 1 times [2019-11-23 23:28:50,560 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-23 23:28:50,561 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1113972963] [2019-11-23 23:28:50,561 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 23:28:50,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 23:28:50,707 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-23 23:28:50,708 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1113972963] [2019-11-23 23:28:50,709 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-23 23:28:50,709 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-23 23:28:50,710 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [522291377] [2019-11-23 23:28:50,715 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-23 23:28:50,715 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-23 23:28:50,726 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-23 23:28:50,727 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-23 23:28:50,729 INFO L87 Difference]: Start difference. First operand 10 states. Second operand 3 states. [2019-11-23 23:28:50,818 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 23:28:50,819 INFO L93 Difference]: Finished difference Result 20 states and 24 transitions. [2019-11-23 23:28:50,820 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-23 23:28:50,822 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 6 [2019-11-23 23:28:50,823 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 23:28:50,838 INFO L225 Difference]: With dead ends: 20 [2019-11-23 23:28:50,838 INFO L226 Difference]: Without dead ends: 9 [2019-11-23 23:28:50,847 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 [2019-11-23 23:28:50,873 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2019-11-23 23:28:50,908 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2019-11-23 23:28:50,909 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2019-11-23 23:28:50,911 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 10 transitions. [2019-11-23 23:28:50,915 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 10 transitions. Word has length 6 [2019-11-23 23:28:50,915 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 23:28:50,916 INFO L462 AbstractCegarLoop]: Abstraction has 9 states and 10 transitions. [2019-11-23 23:28:50,916 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-23 23:28:50,916 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 10 transitions. [2019-11-23 23:28:50,917 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2019-11-23 23:28:50,918 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 23:28:50,918 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2019-11-23 23:28:50,919 INFO L410 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 23:28:50,919 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 23:28:50,920 INFO L82 PathProgramCache]: Analyzing trace with hash -934705340, now seen corresponding path program 1 times [2019-11-23 23:28:50,920 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-23 23:28:50,921 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1601626724] [2019-11-23 23:28:50,921 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 23:28:50,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 23:28:51,181 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-23 23:28:51,182 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1601626724] [2019-11-23 23:28:51,182 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-23 23:28:51,182 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2019-11-23 23:28:51,183 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1858805453] [2019-11-23 23:28:51,184 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-11-23 23:28:51,185 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-23 23:28:51,185 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-11-23 23:28:51,185 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-11-23 23:28:51,186 INFO L87 Difference]: Start difference. First operand 9 states and 10 transitions. Second operand 6 states. [2019-11-23 23:28:51,275 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 23:28:51,275 INFO L93 Difference]: Finished difference Result 14 states and 15 transitions. [2019-11-23 23:28:51,276 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-11-23 23:28:51,276 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 7 [2019-11-23 23:28:51,276 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 23:28:51,277 INFO L225 Difference]: With dead ends: 14 [2019-11-23 23:28:51,277 INFO L226 Difference]: Without dead ends: 12 [2019-11-23 23:28:51,278 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=24, Invalid=32, Unknown=0, NotChecked=0, Total=56 [2019-11-23 23:28:51,279 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2019-11-23 23:28:51,282 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 11. [2019-11-23 23:28:51,282 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2019-11-23 23:28:51,283 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 12 transitions. [2019-11-23 23:28:51,283 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 12 transitions. Word has length 7 [2019-11-23 23:28:51,283 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 23:28:51,284 INFO L462 AbstractCegarLoop]: Abstraction has 11 states and 12 transitions. [2019-11-23 23:28:51,284 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-11-23 23:28:51,284 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 12 transitions. [2019-11-23 23:28:51,284 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2019-11-23 23:28:51,285 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 23:28:51,285 INFO L410 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 23:28:51,285 INFO L410 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 23:28:51,285 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 23:28:51,286 INFO L82 PathProgramCache]: Analyzing trace with hash -1528563638, now seen corresponding path program 1 times [2019-11-23 23:28:51,286 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-23 23:28:51,286 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1441341457] [2019-11-23 23:28:51,286 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 23:28:51,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 23:28:51,421 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-23 23:28:51,421 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1441341457] [2019-11-23 23:28:51,422 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [860775542] [2019-11-23 23:28:51,423 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 [2019-11-23 23:28:51,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 23:28:51,482 INFO L255 TraceCheckSpWp]: Trace formula consists of 55 conjuncts, 20 conjunts are in the unsatisfiable core [2019-11-23 23:28:51,488 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 23:28:51,544 INFO L189 IndexEqualityManager]: detected not equals via solver [2019-11-23 23:28:51,570 INFO L343 Elim1Store]: treesize reduction 41, result has 21.2 percent of original size [2019-11-23 23:28:51,571 INFO L377 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 26 [2019-11-23 23:28:51,572 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-23 23:28:51,588 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-23 23:28:51,590 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2019-11-23 23:28:51,590 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:34, output treesize:34 [2019-11-23 23:28:51,712 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-23 23:28:51,758 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-23 23:28:51,784 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-23 23:28:51,784 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-23 23:28:51,845 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-23 23:28:51,872 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-23 23:28:51,872 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [564447057] [2019-11-23 23:28:51,915 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2019-11-23 23:28:51,915 INFO L166 IcfgInterpreter]: Building call graph [2019-11-23 23:28:51,921 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-23 23:28:51,928 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-23 23:28:51,928 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-23 23:28:54,844 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-23 23:28:55,343 WARN L192 SmtUtils]: Spent 271.00 ms on a formula simplification. DAG size of input: 101 DAG size of output: 67 [2019-11-23 23:28:55,922 INFO L343 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-23 23:28:55,922 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-11-23 23:28:55,922 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7, 7] total 15 [2019-11-23 23:28:55,923 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [977284750] [2019-11-23 23:28:55,923 INFO L442 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-11-23 23:28:55,923 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-23 23:28:55,924 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-11-23 23:28:55,925 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=343, Unknown=0, NotChecked=0, Total=420 [2019-11-23 23:28:55,925 INFO L87 Difference]: Start difference. First operand 11 states and 12 transitions. Second operand 15 states. [2019-11-23 23:28:56,236 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 23:28:56,236 INFO L93 Difference]: Finished difference Result 18 states and 19 transitions. [2019-11-23 23:28:56,236 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-11-23 23:28:56,237 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 10 [2019-11-23 23:28:56,237 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 23:28:56,237 INFO L225 Difference]: With dead ends: 18 [2019-11-23 23:28:56,237 INFO L226 Difference]: Without dead ends: 16 [2019-11-23 23:28:56,238 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 158 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=138, Invalid=564, Unknown=0, NotChecked=0, Total=702 [2019-11-23 23:28:56,239 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2019-11-23 23:28:56,241 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 14. [2019-11-23 23:28:56,242 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2019-11-23 23:28:56,242 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2019-11-23 23:28:56,242 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 10 [2019-11-23 23:28:56,243 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 23:28:56,243 INFO L462 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2019-11-23 23:28:56,243 INFO L463 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-11-23 23:28:56,243 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2019-11-23 23:28:56,244 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2019-11-23 23:28:56,244 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 23:28:56,244 INFO L410 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1] [2019-11-23 23:28:56,448 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 23:28:56,449 INFO L410 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 23:28:56,449 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 23:28:56,449 INFO L82 PathProgramCache]: Analyzing trace with hash 2104140164, now seen corresponding path program 2 times [2019-11-23 23:28:56,449 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-23 23:28:56,450 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [257811785] [2019-11-23 23:28:56,450 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 23:28:56,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 23:28:56,507 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 3 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-23 23:28:56,508 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [257811785] [2019-11-23 23:28:56,508 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [540534251] [2019-11-23 23:28:56,509 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 [2019-11-23 23:28:56,553 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-11-23 23:28:56,553 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 23:28:56,554 INFO L255 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 7 conjunts are in the unsatisfiable core [2019-11-23 23:28:56,556 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 23:28:56,588 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 7 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-23 23:28:56,588 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-23 23:28:56,616 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 7 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-23 23:28:56,617 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1386683134] [2019-11-23 23:28:56,618 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2019-11-23 23:28:56,618 INFO L166 IcfgInterpreter]: Building call graph [2019-11-23 23:28:56,618 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-23 23:28:56,619 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-23 23:28:56,619 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-23 23:28:58,558 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-23 23:28:58,950 WARN L192 SmtUtils]: Spent 244.00 ms on a formula simplification. DAG size of input: 83 DAG size of output: 65 [2019-11-23 23:28:59,310 INFO L343 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-23 23:28:59,311 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-11-23 23:28:59,311 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 12 [2019-11-23 23:28:59,311 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [30019443] [2019-11-23 23:28:59,311 INFO L442 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-11-23 23:28:59,312 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-23 23:28:59,312 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-11-23 23:28:59,312 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=234, Unknown=0, NotChecked=0, Total=306 [2019-11-23 23:28:59,312 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand 12 states. [2019-11-23 23:28:59,400 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 23:28:59,400 INFO L93 Difference]: Finished difference Result 27 states and 29 transitions. [2019-11-23 23:28:59,400 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-11-23 23:28:59,401 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 13 [2019-11-23 23:28:59,401 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 23:28:59,402 INFO L225 Difference]: With dead ends: 27 [2019-11-23 23:28:59,402 INFO L226 Difference]: Without dead ends: 15 [2019-11-23 23:28:59,403 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 26 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=72, Invalid=234, Unknown=0, NotChecked=0, Total=306 [2019-11-23 23:28:59,404 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2019-11-23 23:28:59,407 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2019-11-23 23:28:59,407 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2019-11-23 23:28:59,408 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2019-11-23 23:28:59,408 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 13 [2019-11-23 23:28:59,408 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 23:28:59,408 INFO L462 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2019-11-23 23:28:59,408 INFO L463 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-11-23 23:28:59,408 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2019-11-23 23:28:59,409 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2019-11-23 23:28:59,409 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 23:28:59,409 INFO L410 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1] [2019-11-23 23:28:59,623 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 23:28:59,624 INFO L410 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 23:28:59,624 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 23:28:59,624 INFO L82 PathProgramCache]: Analyzing trace with hash -2019740263, now seen corresponding path program 3 times [2019-11-23 23:28:59,625 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-23 23:28:59,625 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [944199897] [2019-11-23 23:28:59,625 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 23:28:59,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 23:28:59,753 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-23 23:28:59,754 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [944199897] [2019-11-23 23:28:59,754 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1659123890] [2019-11-23 23:28:59,754 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 [2019-11-23 23:28:59,785 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-23 23:28:59,785 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 23:28:59,786 INFO L255 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 25 conjunts are in the unsatisfiable core [2019-11-23 23:28:59,788 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 23:29:00,109 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-23 23:29:00,109 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-23 23:29:00,181 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-23 23:29:00,181 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [638010537] [2019-11-23 23:29:00,182 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2019-11-23 23:29:00,182 INFO L166 IcfgInterpreter]: Building call graph [2019-11-23 23:29:00,183 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-23 23:29:00,183 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-23 23:29:00,183 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-23 23:29:02,132 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-23 23:29:02,656 WARN L192 SmtUtils]: Spent 274.00 ms on a formula simplification. DAG size of input: 101 DAG size of output: 67 [2019-11-23 23:29:03,229 INFO L343 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-23 23:29:03,230 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-11-23 23:29:03,230 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9, 9] total 18 [2019-11-23 23:29:03,231 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1030758469] [2019-11-23 23:29:03,232 INFO L442 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-11-23 23:29:03,232 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-23 23:29:03,232 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-11-23 23:29:03,233 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=453, Unknown=0, NotChecked=0, Total=552 [2019-11-23 23:29:03,233 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand 18 states. [2019-11-23 23:29:03,648 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 23:29:03,648 INFO L93 Difference]: Finished difference Result 22 states and 23 transitions. [2019-11-23 23:29:03,649 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2019-11-23 23:29:03,649 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 14 [2019-11-23 23:29:03,649 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 23:29:03,651 INFO L225 Difference]: With dead ends: 22 [2019-11-23 23:29:03,651 INFO L226 Difference]: Without dead ends: 20 [2019-11-23 23:29:03,652 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 24 SyntacticMatches, 2 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 217 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=182, Invalid=748, Unknown=0, NotChecked=0, Total=930 [2019-11-23 23:29:03,652 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2019-11-23 23:29:03,655 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 18. [2019-11-23 23:29:03,655 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2019-11-23 23:29:03,656 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2019-11-23 23:29:03,656 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 14 [2019-11-23 23:29:03,656 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 23:29:03,656 INFO L462 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2019-11-23 23:29:03,656 INFO L463 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-11-23 23:29:03,657 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2019-11-23 23:29:03,657 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2019-11-23 23:29:03,657 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 23:29:03,657 INFO L410 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 1, 1, 1, 1, 1] [2019-11-23 23:29:03,858 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 23:29:03,858 INFO L410 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 23:29:03,859 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 23:29:03,859 INFO L82 PathProgramCache]: Analyzing trace with hash -1880085035, now seen corresponding path program 4 times [2019-11-23 23:29:03,859 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-23 23:29:03,860 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1721462968] [2019-11-23 23:29:03,860 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 23:29:03,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 23:29:03,931 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 8 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-23 23:29:03,932 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1721462968] [2019-11-23 23:29:03,932 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1568475748] [2019-11-23 23:29:03,932 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 [2019-11-23 23:29:03,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 23:29:03,961 INFO L255 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 9 conjunts are in the unsatisfiable core [2019-11-23 23:29:03,962 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 23:29:03,999 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 15 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-23 23:29:03,999 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-23 23:29:04,033 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 15 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-23 23:29:04,034 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1911379783] [2019-11-23 23:29:04,035 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2019-11-23 23:29:04,035 INFO L166 IcfgInterpreter]: Building call graph [2019-11-23 23:29:04,036 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-23 23:29:04,036 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-23 23:29:04,036 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-23 23:29:05,939 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-23 23:29:06,565 WARN L192 SmtUtils]: Spent 343.00 ms on a formula simplification. DAG size of input: 99 DAG size of output: 65 [2019-11-23 23:29:07,144 INFO L343 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-23 23:29:07,145 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-11-23 23:29:07,145 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9, 9] total 15 [2019-11-23 23:29:07,145 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1910412211] [2019-11-23 23:29:07,146 INFO L442 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-11-23 23:29:07,146 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-23 23:29:07,146 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-11-23 23:29:07,146 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=316, Unknown=0, NotChecked=0, Total=420 [2019-11-23 23:29:07,146 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 15 states. [2019-11-23 23:29:07,235 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 23:29:07,235 INFO L93 Difference]: Finished difference Result 34 states and 36 transitions. [2019-11-23 23:29:07,235 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-11-23 23:29:07,235 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 17 [2019-11-23 23:29:07,236 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 23:29:07,236 INFO L225 Difference]: With dead ends: 34 [2019-11-23 23:29:07,236 INFO L226 Difference]: Without dead ends: 19 [2019-11-23 23:29:07,237 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 36 SyntacticMatches, 3 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 195 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=104, Invalid=316, Unknown=0, NotChecked=0, Total=420 [2019-11-23 23:29:07,237 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2019-11-23 23:29:07,241 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2019-11-23 23:29:07,241 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2019-11-23 23:29:07,241 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2019-11-23 23:29:07,242 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 17 [2019-11-23 23:29:07,242 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 23:29:07,242 INFO L462 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2019-11-23 23:29:07,242 INFO L463 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-11-23 23:29:07,242 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2019-11-23 23:29:07,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2019-11-23 23:29:07,243 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 23:29:07,243 INFO L410 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 1, 1, 1, 1, 1] [2019-11-23 23:29:07,446 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 23:29:07,447 INFO L410 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 23:29:07,447 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 23:29:07,448 INFO L82 PathProgramCache]: Analyzing trace with hash 1474342762, now seen corresponding path program 5 times [2019-11-23 23:29:07,448 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-23 23:29:07,448 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [268382990] [2019-11-23 23:29:07,449 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 23:29:07,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 23:29:07,603 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 3 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-23 23:29:07,604 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [268382990] [2019-11-23 23:29:07,604 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [119013443] [2019-11-23 23:29:07,604 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 [2019-11-23 23:29:07,636 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2019-11-23 23:29:07,636 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 23:29:07,637 INFO L255 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 34 conjunts are in the unsatisfiable core [2019-11-23 23:29:07,639 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 23:29:08,126 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 4 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-23 23:29:08,126 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-23 23:29:08,236 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 3 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-23 23:29:08,236 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1181262303] [2019-11-23 23:29:08,238 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2019-11-23 23:29:08,238 INFO L166 IcfgInterpreter]: Building call graph [2019-11-23 23:29:08,238 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-23 23:29:08,238 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-23 23:29:08,239 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-23 23:29:10,254 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-23 23:29:10,750 WARN L192 SmtUtils]: Spent 228.00 ms on a formula simplification. DAG size of input: 83 DAG size of output: 66 [2019-11-23 23:29:11,326 INFO L343 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-23 23:29:11,327 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-11-23 23:29:11,327 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 12, 11] total 22 [2019-11-23 23:29:11,327 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1550872609] [2019-11-23 23:29:11,328 INFO L442 AbstractCegarLoop]: Interpolant automaton has 22 states [2019-11-23 23:29:11,328 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-23 23:29:11,328 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2019-11-23 23:29:11,329 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=622, Unknown=0, NotChecked=0, Total=756 [2019-11-23 23:29:11,329 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand 22 states. [2019-11-23 23:29:11,928 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 23:29:11,928 INFO L93 Difference]: Finished difference Result 26 states and 27 transitions. [2019-11-23 23:29:11,928 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2019-11-23 23:29:11,928 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 18 [2019-11-23 23:29:11,929 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 23:29:11,929 INFO L225 Difference]: With dead ends: 26 [2019-11-23 23:29:11,929 INFO L226 Difference]: Without dead ends: 24 [2019-11-23 23:29:11,930 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 31 SyntacticMatches, 5 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 318 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=262, Invalid=1070, Unknown=0, NotChecked=0, Total=1332 [2019-11-23 23:29:11,930 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2019-11-23 23:29:11,934 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 22. [2019-11-23 23:29:11,935 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2019-11-23 23:29:11,935 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 23 transitions. [2019-11-23 23:29:11,935 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 23 transitions. Word has length 18 [2019-11-23 23:29:11,936 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 23:29:11,936 INFO L462 AbstractCegarLoop]: Abstraction has 22 states and 23 transitions. [2019-11-23 23:29:11,936 INFO L463 AbstractCegarLoop]: Interpolant automaton has 22 states. [2019-11-23 23:29:11,936 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 23 transitions. [2019-11-23 23:29:11,937 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2019-11-23 23:29:11,937 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 23:29:11,937 INFO L410 BasicCegarLoop]: trace histogram [5, 4, 4, 3, 1, 1, 1, 1, 1] [2019-11-23 23:29:12,140 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 23:29:12,141 INFO L410 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 23:29:12,141 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 23:29:12,141 INFO L82 PathProgramCache]: Analyzing trace with hash 1814894180, now seen corresponding path program 6 times [2019-11-23 23:29:12,141 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-23 23:29:12,142 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [981313302] [2019-11-23 23:29:12,142 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 23:29:12,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 23:29:12,210 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 16 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-23 23:29:12,210 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [981313302] [2019-11-23 23:29:12,210 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1572910880] [2019-11-23 23:29:12,210 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 [2019-11-23 23:29:12,250 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-23 23:29:12,250 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 23:29:12,251 INFO L255 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 11 conjunts are in the unsatisfiable core [2019-11-23 23:29:12,252 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 23:29:12,306 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 26 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-23 23:29:12,307 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-23 23:29:12,360 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 26 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-23 23:29:12,360 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2132596774] [2019-11-23 23:29:12,361 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2019-11-23 23:29:12,362 INFO L166 IcfgInterpreter]: Building call graph [2019-11-23 23:29:12,362 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-23 23:29:12,362 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-23 23:29:12,362 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-23 23:29:14,043 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-23 23:29:14,436 WARN L192 SmtUtils]: Spent 229.00 ms on a formula simplification. DAG size of input: 83 DAG size of output: 65 [2019-11-23 23:29:14,895 INFO L343 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-23 23:29:14,895 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-11-23 23:29:14,895 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11, 11] total 18 [2019-11-23 23:29:14,896 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1953410964] [2019-11-23 23:29:14,896 INFO L442 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-11-23 23:29:14,896 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-23 23:29:14,897 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-11-23 23:29:14,897 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=409, Unknown=0, NotChecked=0, Total=552 [2019-11-23 23:29:14,897 INFO L87 Difference]: Start difference. First operand 22 states and 23 transitions. Second operand 18 states. [2019-11-23 23:29:14,992 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 23:29:14,992 INFO L93 Difference]: Finished difference Result 41 states and 43 transitions. [2019-11-23 23:29:14,992 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2019-11-23 23:29:14,993 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 21 [2019-11-23 23:29:14,993 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 23:29:14,993 INFO L225 Difference]: With dead ends: 41 [2019-11-23 23:29:14,993 INFO L226 Difference]: Without dead ends: 23 [2019-11-23 23:29:14,994 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 46 SyntacticMatches, 4 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 282 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=143, Invalid=409, Unknown=0, NotChecked=0, Total=552 [2019-11-23 23:29:14,994 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2019-11-23 23:29:14,998 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2019-11-23 23:29:14,999 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2019-11-23 23:29:14,999 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2019-11-23 23:29:15,000 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 21 [2019-11-23 23:29:15,000 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 23:29:15,000 INFO L462 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2019-11-23 23:29:15,000 INFO L463 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-11-23 23:29:15,000 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2019-11-23 23:29:15,001 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2019-11-23 23:29:15,001 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 23:29:15,001 INFO L410 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 1, 1, 1, 1, 1] [2019-11-23 23:29:15,203 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 23:29:15,204 INFO L410 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 23:29:15,204 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 23:29:15,204 INFO L82 PathProgramCache]: Analyzing trace with hash -567753351, now seen corresponding path program 7 times [2019-11-23 23:29:15,205 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-23 23:29:15,205 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [732037085] [2019-11-23 23:29:15,205 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 23:29:15,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 23:29:15,354 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 4 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-23 23:29:15,355 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [732037085] [2019-11-23 23:29:15,355 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1158608933] [2019-11-23 23:29:15,355 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 [2019-11-23 23:29:15,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 23:29:15,391 INFO L255 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 35 conjunts are in the unsatisfiable core [2019-11-23 23:29:15,393 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 23:29:16,041 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 7 proven. 29 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-23 23:29:16,041 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-23 23:29:16,212 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 4 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-23 23:29:16,212 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [978156825] [2019-11-23 23:29:16,213 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2019-11-23 23:29:16,214 INFO L166 IcfgInterpreter]: Building call graph [2019-11-23 23:29:16,214 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-23 23:29:16,214 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-23 23:29:16,214 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-23 23:29:17,668 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-23 23:29:18,203 WARN L192 SmtUtils]: Spent 237.00 ms on a formula simplification. DAG size of input: 83 DAG size of output: 65 [2019-11-23 23:29:18,824 INFO L343 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-23 23:29:18,824 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-11-23 23:29:18,824 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13, 13] total 26 [2019-11-23 23:29:18,825 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1011885286] [2019-11-23 23:29:18,825 INFO L442 AbstractCegarLoop]: Interpolant automaton has 26 states [2019-11-23 23:29:18,825 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-23 23:29:18,826 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2019-11-23 23:29:18,826 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=174, Invalid=818, Unknown=0, NotChecked=0, Total=992 [2019-11-23 23:29:18,826 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand 26 states. [2019-11-23 23:29:19,456 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 23:29:19,456 INFO L93 Difference]: Finished difference Result 30 states and 31 transitions. [2019-11-23 23:29:19,457 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-11-23 23:29:19,457 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 22 [2019-11-23 23:29:19,457 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 23:29:19,458 INFO L225 Difference]: With dead ends: 30 [2019-11-23 23:29:19,458 INFO L226 Difference]: Without dead ends: 28 [2019-11-23 23:29:19,458 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 40 SyntacticMatches, 6 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 426 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=315, Invalid=1325, Unknown=0, NotChecked=0, Total=1640 [2019-11-23 23:29:19,459 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2019-11-23 23:29:19,462 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2019-11-23 23:29:19,462 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2019-11-23 23:29:19,463 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 27 transitions. [2019-11-23 23:29:19,463 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 27 transitions. Word has length 22 [2019-11-23 23:29:19,463 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 23:29:19,463 INFO L462 AbstractCegarLoop]: Abstraction has 26 states and 27 transitions. [2019-11-23 23:29:19,464 INFO L463 AbstractCegarLoop]: Interpolant automaton has 26 states. [2019-11-23 23:29:19,464 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 27 transitions. [2019-11-23 23:29:19,464 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2019-11-23 23:29:19,464 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 23:29:19,464 INFO L410 BasicCegarLoop]: trace histogram [6, 5, 5, 4, 1, 1, 1, 1, 1] [2019-11-23 23:29:19,666 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 23:29:19,667 INFO L410 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 23:29:19,667 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 23:29:19,667 INFO L82 PathProgramCache]: Analyzing trace with hash -353627659, now seen corresponding path program 8 times [2019-11-23 23:29:19,668 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-23 23:29:19,668 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [728880620] [2019-11-23 23:29:19,668 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 23:29:19,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 23:29:19,769 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 27 proven. 23 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-23 23:29:19,769 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [728880620] [2019-11-23 23:29:19,770 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [924107968] [2019-11-23 23:29:19,770 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 [2019-11-23 23:29:19,847 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2019-11-23 23:29:19,847 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 23:29:19,849 INFO L255 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 13 conjunts are in the unsatisfiable core [2019-11-23 23:29:19,850 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 23:29:19,915 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 40 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-23 23:29:19,915 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-23 23:29:19,983 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 40 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-23 23:29:19,984 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1195299752] [2019-11-23 23:29:19,984 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2019-11-23 23:29:19,985 INFO L166 IcfgInterpreter]: Building call graph [2019-11-23 23:29:19,985 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-23 23:29:19,986 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-23 23:29:19,986 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-23 23:29:21,607 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-23 23:29:22,098 WARN L192 SmtUtils]: Spent 282.00 ms on a formula simplification. DAG size of input: 101 DAG size of output: 64 [2019-11-23 23:29:22,579 INFO L343 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-23 23:29:22,579 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-11-23 23:29:22,579 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13, 13] total 21 [2019-11-23 23:29:22,580 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1528799748] [2019-11-23 23:29:22,580 INFO L442 AbstractCegarLoop]: Interpolant automaton has 21 states [2019-11-23 23:29:22,580 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-23 23:29:22,581 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2019-11-23 23:29:22,581 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=189, Invalid=513, Unknown=0, NotChecked=0, Total=702 [2019-11-23 23:29:22,581 INFO L87 Difference]: Start difference. First operand 26 states and 27 transitions. Second operand 21 states. [2019-11-23 23:29:22,690 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 23:29:22,690 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2019-11-23 23:29:22,691 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-11-23 23:29:22,691 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 25 [2019-11-23 23:29:22,691 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 23:29:22,692 INFO L225 Difference]: With dead ends: 48 [2019-11-23 23:29:22,692 INFO L226 Difference]: Without dead ends: 27 [2019-11-23 23:29:22,693 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 56 SyntacticMatches, 5 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 381 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=189, Invalid=513, Unknown=0, NotChecked=0, Total=702 [2019-11-23 23:29:22,694 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2019-11-23 23:29:22,699 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2019-11-23 23:29:22,699 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2019-11-23 23:29:22,699 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2019-11-23 23:29:22,700 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 25 [2019-11-23 23:29:22,700 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 23:29:22,700 INFO L462 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2019-11-23 23:29:22,700 INFO L463 AbstractCegarLoop]: Interpolant automaton has 21 states. [2019-11-23 23:29:22,700 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2019-11-23 23:29:22,701 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2019-11-23 23:29:22,701 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 23:29:22,701 INFO L410 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 1, 1, 1, 1, 1] [2019-11-23 23:29:22,901 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 23:29:22,902 INFO L410 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 23:29:22,902 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 23:29:22,902 INFO L82 PathProgramCache]: Analyzing trace with hash -1969213814, now seen corresponding path program 9 times [2019-11-23 23:29:22,903 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-23 23:29:22,903 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2066230706] [2019-11-23 23:29:22,903 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 23:29:22,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 23:29:23,079 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 5 proven. 50 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-23 23:29:23,079 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2066230706] [2019-11-23 23:29:23,079 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [114942677] [2019-11-23 23:29:23,079 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 23:29:23,132 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-23 23:29:23,132 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 23:29:23,133 INFO L255 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 40 conjunts are in the unsatisfiable core [2019-11-23 23:29:23,135 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 23:29:24,085 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 11 proven. 44 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-23 23:29:24,086 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-23 23:29:24,326 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 5 proven. 50 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-23 23:29:24,327 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1328942564] [2019-11-23 23:29:24,327 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2019-11-23 23:29:24,328 INFO L166 IcfgInterpreter]: Building call graph [2019-11-23 23:29:24,328 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-23 23:29:24,328 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-23 23:29:24,328 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-23 23:29:25,846 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-23 23:29:26,496 WARN L192 SmtUtils]: Spent 266.00 ms on a formula simplification. DAG size of input: 99 DAG size of output: 67 [2019-11-23 23:29:27,262 INFO L343 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-23 23:29:27,263 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-11-23 23:29:27,263 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15, 15] total 30 [2019-11-23 23:29:27,263 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1170240009] [2019-11-23 23:29:27,264 INFO L442 AbstractCegarLoop]: Interpolant automaton has 30 states [2019-11-23 23:29:27,264 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-23 23:29:27,264 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2019-11-23 23:29:27,265 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=222, Invalid=1038, Unknown=0, NotChecked=0, Total=1260 [2019-11-23 23:29:27,265 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 30 states. [2019-11-23 23:29:28,067 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 23:29:28,067 INFO L93 Difference]: Finished difference Result 34 states and 35 transitions. [2019-11-23 23:29:28,068 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2019-11-23 23:29:28,068 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 26 [2019-11-23 23:29:28,068 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 23:29:28,069 INFO L225 Difference]: With dead ends: 34 [2019-11-23 23:29:28,069 INFO L226 Difference]: Without dead ends: 32 [2019-11-23 23:29:28,070 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 48 SyntacticMatches, 8 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 559 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=398, Invalid=1672, Unknown=0, NotChecked=0, Total=2070 [2019-11-23 23:29:28,070 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2019-11-23 23:29:28,076 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2019-11-23 23:29:28,076 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2019-11-23 23:29:28,077 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2019-11-23 23:29:28,077 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 26 [2019-11-23 23:29:28,077 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 23:29:28,077 INFO L462 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2019-11-23 23:29:28,077 INFO L463 AbstractCegarLoop]: Interpolant automaton has 30 states. [2019-11-23 23:29:28,077 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2019-11-23 23:29:28,078 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2019-11-23 23:29:28,078 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 23:29:28,078 INFO L410 BasicCegarLoop]: trace histogram [7, 6, 6, 5, 1, 1, 1, 1, 1] [2019-11-23 23:29:28,284 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 23:29:28,284 INFO L410 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 23:29:28,285 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 23:29:28,285 INFO L82 PathProgramCache]: Analyzing trace with hash 114803524, now seen corresponding path program 10 times [2019-11-23 23:29:28,285 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-23 23:29:28,286 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [100849810] [2019-11-23 23:29:28,286 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 23:29:28,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 23:29:28,370 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 41 proven. 31 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-23 23:29:28,371 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [100849810] [2019-11-23 23:29:28,371 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [154270344] [2019-11-23 23:29:28,371 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 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 23:29:28,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 23:29:28,421 INFO L255 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 15 conjunts are in the unsatisfiable core [2019-11-23 23:29:28,423 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 23:29:28,516 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 57 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-23 23:29:28,517 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-23 23:29:28,608 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 57 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-23 23:29:28,608 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [633848867] [2019-11-23 23:29:28,609 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2019-11-23 23:29:28,609 INFO L166 IcfgInterpreter]: Building call graph [2019-11-23 23:29:28,609 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-23 23:29:28,610 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-23 23:29:28,610 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-23 23:29:30,277 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-23 23:29:30,735 WARN L192 SmtUtils]: Spent 258.00 ms on a formula simplification. DAG size of input: 99 DAG size of output: 65 [2019-11-23 23:29:31,258 INFO L343 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-23 23:29:31,258 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-11-23 23:29:31,259 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15, 15] total 24 [2019-11-23 23:29:31,259 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1782538485] [2019-11-23 23:29:31,259 INFO L442 AbstractCegarLoop]: Interpolant automaton has 24 states [2019-11-23 23:29:31,259 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-23 23:29:31,260 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2019-11-23 23:29:31,260 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=242, Invalid=628, Unknown=0, NotChecked=0, Total=870 [2019-11-23 23:29:31,260 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand 24 states. [2019-11-23 23:29:31,393 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 23:29:31,394 INFO L93 Difference]: Finished difference Result 55 states and 57 transitions. [2019-11-23 23:29:31,394 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2019-11-23 23:29:31,394 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 29 [2019-11-23 23:29:31,395 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 23:29:31,395 INFO L225 Difference]: With dead ends: 55 [2019-11-23 23:29:31,395 INFO L226 Difference]: Without dead ends: 31 [2019-11-23 23:29:31,396 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 66 SyntacticMatches, 6 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 492 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=242, Invalid=628, Unknown=0, NotChecked=0, Total=870 [2019-11-23 23:29:31,396 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2019-11-23 23:29:31,402 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2019-11-23 23:29:31,402 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2019-11-23 23:29:31,403 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 32 transitions. [2019-11-23 23:29:31,403 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 32 transitions. Word has length 29 [2019-11-23 23:29:31,403 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 23:29:31,403 INFO L462 AbstractCegarLoop]: Abstraction has 31 states and 32 transitions. [2019-11-23 23:29:31,403 INFO L463 AbstractCegarLoop]: Interpolant automaton has 24 states. [2019-11-23 23:29:31,403 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 32 transitions. [2019-11-23 23:29:31,404 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2019-11-23 23:29:31,404 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 23:29:31,404 INFO L410 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 1, 1, 1, 1, 1] [2019-11-23 23:29:31,606 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 23:29:31,609 INFO L410 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 23:29:31,609 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 23:29:31,610 INFO L82 PathProgramCache]: Analyzing trace with hash 1062309209, now seen corresponding path program 11 times [2019-11-23 23:29:31,610 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-23 23:29:31,610 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [79172436] [2019-11-23 23:29:31,610 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 23:29:31,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 23:29:31,869 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 6 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-23 23:29:31,869 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [79172436] [2019-11-23 23:29:31,869 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [22810873] [2019-11-23 23:29:31,869 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 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 23:29:32,038 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2019-11-23 23:29:32,039 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 23:29:32,041 INFO L255 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 36 conjunts are in the unsatisfiable core [2019-11-23 23:29:32,044 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 23:29:33,069 WARN L192 SmtUtils]: Spent 365.00 ms on a formula simplification. DAG size of input: 165 DAG size of output: 82 [2019-11-23 23:29:33,202 WARN L192 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 95 DAG size of output: 59 [2019-11-23 23:29:33,898 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 51 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-23 23:29:33,898 INFO L320 TraceCheckSpWp]: Computing backward predicates...