/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/loops/vogal-1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-6598664 [2019-11-24 04:28:33,405 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-24 04:28:33,408 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-24 04:28:33,428 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-11-24 04:28:33,429 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-11-24 04:28:33,431 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-11-24 04:28:33,433 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-11-24 04:28:33,444 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-11-24 04:28:33,448 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-11-24 04:28:33,449 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-11-24 04:28:33,450 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-11-24 04:28:33,451 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-11-24 04:28:33,451 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-24 04:28:33,452 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-24 04:28:33,453 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-24 04:28:33,454 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-24 04:28:33,455 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-24 04:28:33,456 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-24 04:28:33,458 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-24 04:28:33,460 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-24 04:28:33,461 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-24 04:28:33,462 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-24 04:28:33,464 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-24 04:28:33,464 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-24 04:28:33,467 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-11-24 04:28:33,470 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-11-24 04:28:33,470 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-11-24 04:28:33,471 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-11-24 04:28:33,472 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-11-24 04:28:33,473 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-11-24 04:28:33,473 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-11-24 04:28:33,474 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-11-24 04:28:33,474 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-11-24 04:28:33,474 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-24 04:28:33,475 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-24 04:28:33,476 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-24 04:28:33,477 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 [2019-11-24 04:28:33,492 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-24 04:28:33,492 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-24 04:28:33,493 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2019-11-24 04:28:33,493 INFO L138 SettingsManager]: * User list type=DISABLED [2019-11-24 04:28:33,493 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2019-11-24 04:28:33,493 INFO L138 SettingsManager]: * Explicit value domain=true [2019-11-24 04:28:33,494 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2019-11-24 04:28:33,494 INFO L138 SettingsManager]: * Octagon Domain=false [2019-11-24 04:28:33,494 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2019-11-24 04:28:33,494 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2019-11-24 04:28:33,494 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2019-11-24 04:28:33,494 INFO L138 SettingsManager]: * Interval Domain=false [2019-11-24 04:28:33,495 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2019-11-24 04:28:33,495 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2019-11-24 04:28:33,495 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2019-11-24 04:28:33,496 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-24 04:28:33,496 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-24 04:28:33,496 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-24 04:28:33,496 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-24 04:28:33,496 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-24 04:28:33,497 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-24 04:28:33,497 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-24 04:28:33,497 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-24 04:28:33,497 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-24 04:28:33,497 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-24 04:28:33,498 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-24 04:28:33,498 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-24 04:28:33,498 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-24 04:28:33,498 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-24 04:28:33,498 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-24 04:28:33,499 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-24 04:28:33,499 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-24 04:28:33,499 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-24 04:28:33,499 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2019-11-24 04:28:33,499 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-24 04:28:33,500 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-24 04:28:33,500 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-11-24 04:28:33,500 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2019-11-24 04:28:33,758 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-24 04:28:33,775 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-24 04:28:33,780 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-24 04:28:33,782 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-24 04:28:33,782 INFO L275 PluginConnector]: CDTParser initialized [2019-11-24 04:28:33,783 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/vogal-1.i [2019-11-24 04:28:33,857 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2c1c47189/934418f3175b4a9e9223046f81d0967f/FLAGa20b66499 [2019-11-24 04:28:34,310 INFO L306 CDTParser]: Found 1 translation units. [2019-11-24 04:28:34,311 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/vogal-1.i [2019-11-24 04:28:34,322 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2c1c47189/934418f3175b4a9e9223046f81d0967f/FLAGa20b66499 [2019-11-24 04:28:34,696 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2c1c47189/934418f3175b4a9e9223046f81d0967f [2019-11-24 04:28:34,704 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-24 04:28:34,706 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2019-11-24 04:28:34,707 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-24 04:28:34,707 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-24 04:28:34,711 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-24 04:28:34,712 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.11 04:28:34" (1/1) ... [2019-11-24 04:28:34,715 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@17f20484 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 04:28:34, skipping insertion in model container [2019-11-24 04:28:34,715 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.11 04:28:34" (1/1) ... [2019-11-24 04:28:34,723 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2019-11-24 04:28:34,741 INFO L178 MainTranslator]: Built tables and reachable declarations [2019-11-24 04:28:34,929 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-24 04:28:34,933 INFO L203 MainTranslator]: Completed pre-run [2019-11-24 04:28:34,959 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-24 04:28:35,058 INFO L208 MainTranslator]: Completed translation [2019-11-24 04:28:35,058 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 04:28:35 WrapperNode [2019-11-24 04:28:35,058 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-24 04:28:35,059 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2019-11-24 04:28:35,059 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2019-11-24 04:28:35,059 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2019-11-24 04:28:35,065 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 04:28:35" (1/1) ... [2019-11-24 04:28:35,073 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 04:28:35" (1/1) ... [2019-11-24 04:28:35,101 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2019-11-24 04:28:35,101 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-24 04:28:35,102 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-24 04:28:35,102 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-24 04:28:35,112 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 04:28:35" (1/1) ... [2019-11-24 04:28:35,112 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 04:28:35" (1/1) ... [2019-11-24 04:28:35,115 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 04:28:35" (1/1) ... [2019-11-24 04:28:35,115 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 04:28:35" (1/1) ... [2019-11-24 04:28:35,122 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 04:28:35" (1/1) ... [2019-11-24 04:28:35,128 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 04:28:35" (1/1) ... [2019-11-24 04:28:35,130 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 04:28:35" (1/1) ... [2019-11-24 04:28:35,132 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-24 04:28:35,133 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-24 04:28:35,133 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-24 04:28:35,133 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-24 04:28:35,134 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 04:28:35" (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 [2019-11-24 04:28:35,197 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-11-24 04:28:35,198 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-24 04:28:35,198 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-24 04:28:35,198 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-11-24 04:28:35,198 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2019-11-24 04:28:35,199 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-11-24 04:28:35,199 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-11-24 04:28:35,685 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-24 04:28:35,686 INFO L284 CfgBuilder]: Removed 12 assume(true) statements. [2019-11-24 04:28:35,687 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.11 04:28:35 BoogieIcfgContainer [2019-11-24 04:28:35,687 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-24 04:28:35,688 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-24 04:28:35,688 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-24 04:28:35,691 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-24 04:28:35,692 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.11 04:28:34" (1/3) ... [2019-11-24 04:28:35,692 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@75ad28b4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.11 04:28:35, skipping insertion in model container [2019-11-24 04:28:35,693 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 04:28:35" (2/3) ... [2019-11-24 04:28:35,693 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@75ad28b4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.11 04:28:35, skipping insertion in model container [2019-11-24 04:28:35,693 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.11 04:28:35" (3/3) ... [2019-11-24 04:28:35,695 INFO L109 eAbstractionObserver]: Analyzing ICFG vogal-1.i [2019-11-24 04:28:35,703 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-24 04:28:35,710 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-24 04:28:35,720 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-24 04:28:35,747 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-24 04:28:35,747 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-24 04:28:35,747 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-24 04:28:35,747 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-24 04:28:35,747 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-24 04:28:35,748 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-24 04:28:35,748 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-24 04:28:35,748 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-24 04:28:35,761 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states. [2019-11-24 04:28:35,766 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2019-11-24 04:28:35,766 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 04:28:35,767 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-24 04:28:35,768 INFO L410 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 04:28:35,772 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 04:28:35,773 INFO L82 PathProgramCache]: Analyzing trace with hash 2011337302, now seen corresponding path program 1 times [2019-11-24 04:28:35,780 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 04:28:35,781 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [58378304] [2019-11-24 04:28:35,781 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 04:28:35,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 04:28:35,925 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-24 04:28:35,926 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [58378304] [2019-11-24 04:28:35,927 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-24 04:28:35,928 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2019-11-24 04:28:35,929 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1033244824] [2019-11-24 04:28:35,934 INFO L442 AbstractCegarLoop]: Interpolant automaton has 2 states [2019-11-24 04:28:35,935 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 04:28:35,949 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2019-11-24 04:28:35,950 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-11-24 04:28:35,954 INFO L87 Difference]: Start difference. First operand 18 states. Second operand 2 states. [2019-11-24 04:28:35,976 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 04:28:35,977 INFO L93 Difference]: Finished difference Result 31 states and 45 transitions. [2019-11-24 04:28:35,977 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2019-11-24 04:28:35,979 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2019-11-24 04:28:35,980 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 04:28:35,991 INFO L225 Difference]: With dead ends: 31 [2019-11-24 04:28:35,992 INFO L226 Difference]: Without dead ends: 15 [2019-11-24 04:28:35,996 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-11-24 04:28:36,017 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2019-11-24 04:28:36,032 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2019-11-24 04:28:36,034 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2019-11-24 04:28:36,035 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 20 transitions. [2019-11-24 04:28:36,037 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 20 transitions. Word has length 10 [2019-11-24 04:28:36,037 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 04:28:36,038 INFO L462 AbstractCegarLoop]: Abstraction has 15 states and 20 transitions. [2019-11-24 04:28:36,038 INFO L463 AbstractCegarLoop]: Interpolant automaton has 2 states. [2019-11-24 04:28:36,038 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 20 transitions. [2019-11-24 04:28:36,039 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2019-11-24 04:28:36,039 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 04:28:36,040 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-24 04:28:36,040 INFO L410 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 04:28:36,040 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 04:28:36,041 INFO L82 PathProgramCache]: Analyzing trace with hash 564779890, now seen corresponding path program 1 times [2019-11-24 04:28:36,041 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 04:28:36,041 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2123848995] [2019-11-24 04:28:36,042 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 04:28:36,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 04:28:36,142 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-24 04:28:36,142 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2123848995] [2019-11-24 04:28:36,143 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-24 04:28:36,143 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2019-11-24 04:28:36,143 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1488555457] [2019-11-24 04:28:36,145 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-24 04:28:36,146 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 04:28:36,146 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-24 04:28:36,146 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-24 04:28:36,147 INFO L87 Difference]: Start difference. First operand 15 states and 20 transitions. Second operand 3 states. [2019-11-24 04:28:36,202 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 04:28:36,202 INFO L93 Difference]: Finished difference Result 38 states and 51 transitions. [2019-11-24 04:28:36,203 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-24 04:28:36,203 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 12 [2019-11-24 04:28:36,204 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 04:28:36,204 INFO L225 Difference]: With dead ends: 38 [2019-11-24 04:28:36,205 INFO L226 Difference]: Without dead ends: 25 [2019-11-24 04:28:36,206 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-24 04:28:36,206 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2019-11-24 04:28:36,210 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 16. [2019-11-24 04:28:36,210 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2019-11-24 04:28:36,211 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 21 transitions. [2019-11-24 04:28:36,211 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 21 transitions. Word has length 12 [2019-11-24 04:28:36,212 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 04:28:36,212 INFO L462 AbstractCegarLoop]: Abstraction has 16 states and 21 transitions. [2019-11-24 04:28:36,212 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-24 04:28:36,212 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 21 transitions. [2019-11-24 04:28:36,213 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2019-11-24 04:28:36,213 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 04:28:36,213 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-24 04:28:36,213 INFO L410 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 04:28:36,214 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 04:28:36,214 INFO L82 PathProgramCache]: Analyzing trace with hash 1393502561, now seen corresponding path program 1 times [2019-11-24 04:28:36,214 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 04:28:36,215 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [273005562] [2019-11-24 04:28:36,215 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 04:28:36,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 04:28:36,352 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-24 04:28:36,352 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [273005562] [2019-11-24 04:28:36,353 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [937915535] [2019-11-24 04:28:36,353 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 [2019-11-24 04:28:36,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 04:28:36,436 INFO L255 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 12 conjunts are in the unsatisfiable core [2019-11-24 04:28:36,445 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-24 04:28:36,493 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-24 04:28:36,493 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-24 04:28:36,558 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-24 04:28:36,558 INFO L220 FreeRefinementEngine]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2019-11-24 04:28:36,559 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [3] total 10 [2019-11-24 04:28:36,559 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [342474837] [2019-11-24 04:28:36,560 INFO L442 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-11-24 04:28:36,560 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 04:28:36,560 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-11-24 04:28:36,561 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2019-11-24 04:28:36,561 INFO L87 Difference]: Start difference. First operand 16 states and 21 transitions. Second operand 8 states. [2019-11-24 04:28:36,635 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 04:28:36,635 INFO L93 Difference]: Finished difference Result 32 states and 41 transitions. [2019-11-24 04:28:36,635 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-11-24 04:28:36,636 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 13 [2019-11-24 04:28:36,636 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 04:28:36,637 INFO L225 Difference]: With dead ends: 32 [2019-11-24 04:28:36,637 INFO L226 Difference]: Without dead ends: 28 [2019-11-24 04:28:36,638 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=79, Unknown=0, NotChecked=0, Total=110 [2019-11-24 04:28:36,638 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2019-11-24 04:28:36,643 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 21. [2019-11-24 04:28:36,662 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2019-11-24 04:28:36,662 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 29 transitions. [2019-11-24 04:28:36,663 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 29 transitions. Word has length 13 [2019-11-24 04:28:36,663 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 04:28:36,663 INFO L462 AbstractCegarLoop]: Abstraction has 21 states and 29 transitions. [2019-11-24 04:28:36,663 INFO L463 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-11-24 04:28:36,663 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 29 transitions. [2019-11-24 04:28:36,664 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-11-24 04:28:36,664 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 04:28:36,664 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-24 04:28:36,865 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-24 04:28:36,865 INFO L410 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 04:28:36,866 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 04:28:36,866 INFO L82 PathProgramCache]: Analyzing trace with hash -1174863264, now seen corresponding path program 1 times [2019-11-24 04:28:36,867 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 04:28:36,867 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1370392885] [2019-11-24 04:28:36,868 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 04:28:36,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 04:28:36,959 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-24 04:28:36,960 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1370392885] [2019-11-24 04:28:36,960 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [115654300] [2019-11-24 04:28:36,960 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 [2019-11-24 04:28:37,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 04:28:37,027 INFO L255 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 7 conjunts are in the unsatisfiable core [2019-11-24 04:28:37,029 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-24 04:28:37,052 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-24 04:28:37,053 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-24 04:28:37,076 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-24 04:28:37,077 INFO L220 FreeRefinementEngine]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2019-11-24 04:28:37,077 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [3] total 8 [2019-11-24 04:28:37,077 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [762980103] [2019-11-24 04:28:37,078 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-11-24 04:28:37,078 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 04:28:37,078 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-11-24 04:28:37,078 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2019-11-24 04:28:37,079 INFO L87 Difference]: Start difference. First operand 21 states and 29 transitions. Second operand 6 states. [2019-11-24 04:28:37,166 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 04:28:37,166 INFO L93 Difference]: Finished difference Result 53 states and 73 transitions. [2019-11-24 04:28:37,167 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-24 04:28:37,167 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 16 [2019-11-24 04:28:37,167 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 04:28:37,168 INFO L225 Difference]: With dead ends: 53 [2019-11-24 04:28:37,168 INFO L226 Difference]: Without dead ends: 39 [2019-11-24 04:28:37,168 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2019-11-24 04:28:37,169 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2019-11-24 04:28:37,174 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 25. [2019-11-24 04:28:37,175 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2019-11-24 04:28:37,175 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 34 transitions. [2019-11-24 04:28:37,175 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 34 transitions. Word has length 16 [2019-11-24 04:28:37,176 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 04:28:37,176 INFO L462 AbstractCegarLoop]: Abstraction has 25 states and 34 transitions. [2019-11-24 04:28:37,176 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-11-24 04:28:37,176 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 34 transitions. [2019-11-24 04:28:37,177 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2019-11-24 04:28:37,177 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 04:28:37,177 INFO L410 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-24 04:28:37,383 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-24 04:28:37,383 INFO L410 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 04:28:37,383 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 04:28:37,384 INFO L82 PathProgramCache]: Analyzing trace with hash 1704135482, now seen corresponding path program 1 times [2019-11-24 04:28:37,384 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 04:28:37,384 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1449055821] [2019-11-24 04:28:37,385 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 04:28:37,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 04:28:37,456 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-11-24 04:28:37,459 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1449055821] [2019-11-24 04:28:37,459 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1723711327] [2019-11-24 04:28:37,460 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 [2019-11-24 04:28:37,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 04:28:37,537 INFO L255 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 17 conjunts are in the unsatisfiable core [2019-11-24 04:28:37,540 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-24 04:28:37,619 INFO L377 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2019-11-24 04:28:37,619 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-24 04:28:37,626 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-24 04:28:37,626 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-11-24 04:28:37,627 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:15, output treesize:3 [2019-11-24 04:28:37,695 INFO L377 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2019-11-24 04:28:37,695 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-24 04:28:37,699 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-24 04:28:37,699 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-11-24 04:28:37,699 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:15, output treesize:3 [2019-11-24 04:28:37,710 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-24 04:28:37,711 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-24 04:28:37,826 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-24 04:28:37,827 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2019-11-24 04:28:37,827 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [3, 8] total 15 [2019-11-24 04:28:37,827 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1931215] [2019-11-24 04:28:37,827 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-11-24 04:28:37,828 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 04:28:37,828 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-11-24 04:28:37,828 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=160, Unknown=0, NotChecked=0, Total=210 [2019-11-24 04:28:37,828 INFO L87 Difference]: Start difference. First operand 25 states and 34 transitions. Second operand 7 states. [2019-11-24 04:28:38,042 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 04:28:38,043 INFO L93 Difference]: Finished difference Result 37 states and 48 transitions. [2019-11-24 04:28:38,043 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-11-24 04:28:38,043 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 17 [2019-11-24 04:28:38,044 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 04:28:38,044 INFO L225 Difference]: With dead ends: 37 [2019-11-24 04:28:38,045 INFO L226 Difference]: Without dead ends: 23 [2019-11-24 04:28:38,045 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 72 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=74, Invalid=232, Unknown=0, NotChecked=0, Total=306 [2019-11-24 04:28:38,046 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2019-11-24 04:28:38,049 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2019-11-24 04:28:38,050 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2019-11-24 04:28:38,050 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 31 transitions. [2019-11-24 04:28:38,050 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 31 transitions. Word has length 17 [2019-11-24 04:28:38,051 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 04:28:38,051 INFO L462 AbstractCegarLoop]: Abstraction has 23 states and 31 transitions. [2019-11-24 04:28:38,051 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-11-24 04:28:38,051 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 31 transitions. [2019-11-24 04:28:38,052 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2019-11-24 04:28:38,052 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 04:28:38,052 INFO L410 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-24 04:28:38,256 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-24 04:28:38,256 INFO L410 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 04:28:38,257 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 04:28:38,257 INFO L82 PathProgramCache]: Analyzing trace with hash -1463330203, now seen corresponding path program 1 times [2019-11-24 04:28:38,257 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 04:28:38,257 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1860123826] [2019-11-24 04:28:38,258 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 04:28:38,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 04:28:38,352 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-11-24 04:28:38,352 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1860123826] [2019-11-24 04:28:38,353 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [141938214] [2019-11-24 04:28:38,353 INFO L94 rtionOrderModulation]: Keeping assertion order 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 [2019-11-24 04:28:38,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 04:28:38,409 INFO L255 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 17 conjunts are in the unsatisfiable core [2019-11-24 04:28:38,411 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-24 04:28:38,429 INFO L377 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2019-11-24 04:28:38,430 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-24 04:28:38,434 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-24 04:28:38,435 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-11-24 04:28:38,435 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:15, output treesize:3 [2019-11-24 04:28:38,514 INFO L377 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 8 [2019-11-24 04:28:38,515 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-24 04:28:38,518 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-24 04:28:38,518 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-11-24 04:28:38,518 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:16, output treesize:4 [2019-11-24 04:28:38,547 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-24 04:28:38,547 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-24 04:28:38,637 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-11-24 04:28:38,638 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2019-11-24 04:28:38,638 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [3, 8] total 15 [2019-11-24 04:28:38,638 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [818166724] [2019-11-24 04:28:38,639 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-11-24 04:28:38,639 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 04:28:38,639 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-11-24 04:28:38,639 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=160, Unknown=0, NotChecked=0, Total=210 [2019-11-24 04:28:38,640 INFO L87 Difference]: Start difference. First operand 23 states and 31 transitions. Second operand 7 states. [2019-11-24 04:28:38,812 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 04:28:38,812 INFO L93 Difference]: Finished difference Result 36 states and 49 transitions. [2019-11-24 04:28:38,814 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-11-24 04:28:38,815 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 18 [2019-11-24 04:28:38,815 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 04:28:38,816 INFO L225 Difference]: With dead ends: 36 [2019-11-24 04:28:38,816 INFO L226 Difference]: Without dead ends: 32 [2019-11-24 04:28:38,818 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 72 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=74, Invalid=232, Unknown=0, NotChecked=0, Total=306 [2019-11-24 04:28:38,818 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2019-11-24 04:28:38,823 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 25. [2019-11-24 04:28:38,823 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2019-11-24 04:28:38,825 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 33 transitions. [2019-11-24 04:28:38,825 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 33 transitions. Word has length 18 [2019-11-24 04:28:38,826 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 04:28:38,826 INFO L462 AbstractCegarLoop]: Abstraction has 25 states and 33 transitions. [2019-11-24 04:28:38,826 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-11-24 04:28:38,826 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 33 transitions. [2019-11-24 04:28:38,827 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2019-11-24 04:28:38,827 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 04:28:38,827 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-24 04:28:39,030 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-24 04:28:39,031 INFO L410 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 04:28:39,031 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 04:28:39,031 INFO L82 PathProgramCache]: Analyzing trace with hash 1351594965, now seen corresponding path program 1 times [2019-11-24 04:28:39,031 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 04:28:39,031 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1205216176] [2019-11-24 04:28:39,032 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 04:28:39,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 04:28:39,091 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2019-11-24 04:28:39,091 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1205216176] [2019-11-24 04:28:39,091 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [733430441] [2019-11-24 04:28:39,092 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 [2019-11-24 04:28:39,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 04:28:39,145 INFO L255 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 13 conjunts are in the unsatisfiable core [2019-11-24 04:28:39,147 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-24 04:28:39,157 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2019-11-24 04:28:39,157 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-24 04:28:39,186 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-11-24 04:28:39,186 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [123882654] [2019-11-24 04:28:39,230 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2019-11-24 04:28:39,230 INFO L166 IcfgInterpreter]: Building call graph [2019-11-24 04:28:39,239 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-24 04:28:39,249 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-24 04:28:39,249 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-24 04:28:39,624 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:28:40,143 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:28:40,160 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:28:40,563 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:28:40,581 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:28:40,856 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:28:41,077 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:28:41,414 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:28:41,449 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:28:41,468 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:28:41,484 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:28:41,736 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:28:42,792 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:28:43,186 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:28:43,203 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:28:43,222 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:28:43,552 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:28:43,908 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:28:43,927 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:28:43,943 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:28:45,240 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:28:45,549 WARN L192 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 190 [2019-11-24 04:28:45,683 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:28:45,889 WARN L192 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 193 [2019-11-24 04:28:45,920 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:28:46,288 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-24 04:28:47,317 WARN L192 SmtUtils]: Spent 892.00 ms on a formula simplification. DAG size of input: 141 DAG size of output: 107 [2019-11-24 04:28:50,903 WARN L192 SmtUtils]: Spent 3.52 s on a formula simplification. DAG size of input: 130 DAG size of output: 107 [2019-11-24 04:28:52,486 WARN L192 SmtUtils]: Spent 1.49 s on a formula simplification. DAG size of input: 134 DAG size of output: 111 [2019-11-24 04:28:54,310 WARN L192 SmtUtils]: Spent 1.71 s on a formula simplification. DAG size of input: 131 DAG size of output: 108 [2019-11-24 04:28:54,593 WARN L192 SmtUtils]: Spent 196.00 ms on a formula simplification. DAG size of input: 134 DAG size of output: 40 [2019-11-24 04:28:54,878 WARN L192 SmtUtils]: Spent 201.00 ms on a formula simplification. DAG size of input: 142 DAG size of output: 50 [2019-11-24 04:28:55,266 WARN L192 SmtUtils]: Spent 209.00 ms on a formula simplification. DAG size of input: 154 DAG size of output: 49 [2019-11-24 04:28:55,268 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 3 imperfect interpolant sequences. [2019-11-24 04:28:55,268 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [3, 3, 5] total 17 [2019-11-24 04:28:55,269 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [674839746] [2019-11-24 04:28:55,270 INFO L442 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-11-24 04:28:55,270 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 04:28:55,270 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-11-24 04:28:55,270 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=208, Unknown=0, NotChecked=0, Total=272 [2019-11-24 04:28:55,271 INFO L87 Difference]: Start difference. First operand 25 states and 33 transitions. Second operand 11 states. [2019-11-24 04:28:55,529 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 04:28:55,530 INFO L93 Difference]: Finished difference Result 46 states and 63 transitions. [2019-11-24 04:28:55,530 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-11-24 04:28:55,530 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 19 [2019-11-24 04:28:55,530 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 04:28:55,532 INFO L225 Difference]: With dead ends: 46 [2019-11-24 04:28:55,533 INFO L226 Difference]: Without dead ends: 34 [2019-11-24 04:28:55,534 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 42 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 9.0s TimeCoverageRelationStatistics Valid=64, Invalid=208, Unknown=0, NotChecked=0, Total=272 [2019-11-24 04:28:55,534 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2019-11-24 04:28:55,539 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 26. [2019-11-24 04:28:55,539 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2019-11-24 04:28:55,540 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2019-11-24 04:28:55,540 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 19 [2019-11-24 04:28:55,540 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 04:28:55,541 INFO L462 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2019-11-24 04:28:55,541 INFO L463 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-11-24 04:28:55,541 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2019-11-24 04:28:55,541 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2019-11-24 04:28:55,541 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 04:28:55,542 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-24 04:28:55,744 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-24 04:28:55,745 INFO L410 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 04:28:55,746 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 04:28:55,746 INFO L82 PathProgramCache]: Analyzing trace with hash -1957049657, now seen corresponding path program 1 times [2019-11-24 04:28:55,746 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 04:28:55,747 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1674680244] [2019-11-24 04:28:55,747 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 04:28:55,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 04:28:55,814 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-11-24 04:28:55,814 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1674680244] [2019-11-24 04:28:55,815 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2115909021] [2019-11-24 04:28:55,815 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 [2019-11-24 04:28:55,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 04:28:55,860 INFO L255 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 8 conjunts are in the unsatisfiable core [2019-11-24 04:28:55,861 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-24 04:28:55,865 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-11-24 04:28:55,866 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-24 04:28:55,873 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2019-11-24 04:28:55,873 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2019-11-24 04:28:55,874 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3, 3] total 6 [2019-11-24 04:28:55,874 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [932865398] [2019-11-24 04:28:55,874 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-24 04:28:55,875 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 04:28:55,875 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-24 04:28:55,875 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2019-11-24 04:28:55,875 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 3 states. [2019-11-24 04:28:55,900 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 04:28:55,900 INFO L93 Difference]: Finished difference Result 40 states and 54 transitions. [2019-11-24 04:28:55,901 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-24 04:28:55,901 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2019-11-24 04:28:55,901 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 04:28:55,901 INFO L225 Difference]: With dead ends: 40 [2019-11-24 04:28:55,902 INFO L226 Difference]: Without dead ends: 24 [2019-11-24 04:28:55,902 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2019-11-24 04:28:55,902 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2019-11-24 04:28:55,907 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2019-11-24 04:28:55,907 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2019-11-24 04:28:55,907 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 28 transitions. [2019-11-24 04:28:55,907 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 28 transitions. Word has length 21 [2019-11-24 04:28:55,908 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 04:28:55,908 INFO L462 AbstractCegarLoop]: Abstraction has 23 states and 28 transitions. [2019-11-24 04:28:55,908 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-24 04:28:55,908 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 28 transitions. [2019-11-24 04:28:55,909 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2019-11-24 04:28:55,909 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 04:28:55,909 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-24 04:28:56,112 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-24 04:28:56,113 INFO L410 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 04:28:56,113 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 04:28:56,113 INFO L82 PathProgramCache]: Analyzing trace with hash -771548610, now seen corresponding path program 1 times [2019-11-24 04:28:56,114 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 04:28:56,114 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [471930728] [2019-11-24 04:28:56,114 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 04:28:56,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 04:28:56,173 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2019-11-24 04:28:56,173 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [471930728] [2019-11-24 04:28:56,173 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1888120698] [2019-11-24 04:28:56,174 INFO L94 rtionOrderModulation]: Keeping assertion order 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 [2019-11-24 04:28:56,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 04:28:56,230 INFO L255 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 32 conjunts are in the unsatisfiable core [2019-11-24 04:28:56,233 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-24 04:28:56,423 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-24 04:28:56,423 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-24 04:28:56,615 WARN L192 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 46 [2019-11-24 04:28:57,601 WARN L192 SmtUtils]: Spent 564.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 75 [2019-11-24 04:28:57,815 WARN L192 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 100 [2019-11-24 04:28:57,823 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-11-24 04:28:57,824 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1411942625] [2019-11-24 04:28:57,825 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2019-11-24 04:28:57,826 INFO L166 IcfgInterpreter]: Building call graph [2019-11-24 04:28:57,826 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-24 04:28:57,826 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-24 04:28:57,826 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-24 04:28:57,899 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:28:57,989 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:28:57,997 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:28:58,374 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:28:58,387 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:28:58,989 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:28:59,159 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:28:59,470 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:29:01,597 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:29:01,628 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:29:01,644 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:29:01,658 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:29:02,879 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:29:03,124 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:29:03,141 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:29:03,175 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:29:04,496 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:29:04,512 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:29:06,709 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:29:07,230 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:29:07,492 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:29:07,734 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:29:07,884 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:29:10,467 WARN L177 XnfTransformerHelper]: Simplifying disjunction of 25573 conjuctions. This might take some time... [2019-11-24 04:30:07,308 WARN L177 XnfTransformerHelper]: Simplifying disjunction of 26816 conjuctions. This might take some time...