/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/eca-rers2012/Problem02_label49.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-6598664 [2019-11-23 23:33:16,831 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-23 23:33:16,835 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-23 23:33:16,855 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2019-11-23 23:33:16,914 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 23:33:16,929 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-23 23:33:16,929 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-23 23:33:16,930 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2019-11-23 23:33:16,930 INFO L138 SettingsManager]: * User list type=DISABLED [2019-11-23 23:33:16,930 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2019-11-23 23:33:16,930 INFO L138 SettingsManager]: * Explicit value domain=true [2019-11-23 23:33:16,931 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2019-11-23 23:33:16,931 INFO L138 SettingsManager]: * Octagon Domain=false [2019-11-23 23:33:16,931 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2019-11-23 23:33:16,931 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2019-11-23 23:33:16,931 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2019-11-23 23:33:16,931 INFO L138 SettingsManager]: * Interval Domain=false [2019-11-23 23:33:16,932 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2019-11-23 23:33:16,932 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2019-11-23 23:33:16,932 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2019-11-23 23:33:16,933 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-23 23:33:16,933 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-23 23:33:16,933 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-23 23:33:16,934 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-23 23:33:16,934 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-23 23:33:16,934 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-23 23:33:16,934 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-23 23:33:16,934 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-23 23:33:16,935 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-23 23:33:16,935 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-23 23:33:16,935 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-23 23:33:16,935 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-23 23:33:16,935 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-23 23:33:16,935 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-23 23:33:16,936 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-23 23:33:16,936 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-23 23:33:16,936 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-23 23:33:16,936 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-23 23:33:16,937 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2019-11-23 23:33:16,937 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-23 23:33:16,937 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-23 23:33:16,937 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-11-23 23:33:16,937 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2019-11-23 23:33:17,237 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-23 23:33:17,251 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-23 23:33:17,256 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-23 23:33:17,257 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-23 23:33:17,258 INFO L275 PluginConnector]: CDTParser initialized [2019-11-23 23:33:17,258 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/eca-rers2012/Problem02_label49.c [2019-11-23 23:33:17,320 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1b9e3cec6/3cba840c92c84cde8e5d3726b7ed6679/FLAG9cdb58cde [2019-11-23 23:33:17,888 INFO L306 CDTParser]: Found 1 translation units. [2019-11-23 23:33:17,889 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/eca-rers2012/Problem02_label49.c [2019-11-23 23:33:17,905 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1b9e3cec6/3cba840c92c84cde8e5d3726b7ed6679/FLAG9cdb58cde [2019-11-23 23:33:18,152 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1b9e3cec6/3cba840c92c84cde8e5d3726b7ed6679 [2019-11-23 23:33:18,162 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-23 23:33:18,163 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2019-11-23 23:33:18,164 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-23 23:33:18,165 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-23 23:33:18,169 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-23 23:33:18,170 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 11:33:18" (1/1) ... [2019-11-23 23:33:18,173 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2fae2f81 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 11:33:18, skipping insertion in model container [2019-11-23 23:33:18,173 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 11:33:18" (1/1) ... [2019-11-23 23:33:18,181 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2019-11-23 23:33:18,233 INFO L178 MainTranslator]: Built tables and reachable declarations [2019-11-23 23:33:18,750 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-23 23:33:18,761 INFO L203 MainTranslator]: Completed pre-run [2019-11-23 23:33:18,883 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-23 23:33:18,899 INFO L208 MainTranslator]: Completed translation [2019-11-23 23:33:18,900 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 11:33:18 WrapperNode [2019-11-23 23:33:18,900 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-23 23:33:18,901 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2019-11-23 23:33:18,901 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2019-11-23 23:33:18,901 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2019-11-23 23:33:18,908 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 11:33:18" (1/1) ... [2019-11-23 23:33:18,929 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 11:33:18" (1/1) ... [2019-11-23 23:33:18,987 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2019-11-23 23:33:18,988 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-23 23:33:18,988 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-23 23:33:18,988 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-23 23:33:18,997 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 11:33:18" (1/1) ... [2019-11-23 23:33:18,997 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 11:33:18" (1/1) ... [2019-11-23 23:33:19,001 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 11:33:18" (1/1) ... [2019-11-23 23:33:19,002 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 11:33:18" (1/1) ... [2019-11-23 23:33:19,036 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 11:33:18" (1/1) ... [2019-11-23 23:33:19,057 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 11:33:18" (1/1) ... [2019-11-23 23:33:19,070 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 11:33:18" (1/1) ... [2019-11-23 23:33:19,087 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-23 23:33:19,087 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-23 23:33:19,088 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-23 23:33:19,088 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-23 23:33:19,089 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 11:33:18" (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 23:33:19,161 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-23 23:33:19,164 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-23 23:33:21,344 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-23 23:33:21,345 INFO L284 CfgBuilder]: Removed 7 assume(true) statements. [2019-11-23 23:33:21,346 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 11:33:21 BoogieIcfgContainer [2019-11-23 23:33:21,346 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-23 23:33:21,347 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-23 23:33:21,348 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-23 23:33:21,351 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-23 23:33:21,351 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 11:33:18" (1/3) ... [2019-11-23 23:33:21,352 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7a99ae03 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 11:33:21, skipping insertion in model container [2019-11-23 23:33:21,353 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 11:33:18" (2/3) ... [2019-11-23 23:33:21,353 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7a99ae03 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 11:33:21, skipping insertion in model container [2019-11-23 23:33:21,353 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 11:33:21" (3/3) ... [2019-11-23 23:33:21,355 INFO L109 eAbstractionObserver]: Analyzing ICFG Problem02_label49.c [2019-11-23 23:33:21,365 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-23 23:33:21,375 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-23 23:33:21,388 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-23 23:33:21,431 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-23 23:33:21,431 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-23 23:33:21,431 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-23 23:33:21,431 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-23 23:33:21,432 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-23 23:33:21,432 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-23 23:33:21,432 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-23 23:33:21,432 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-23 23:33:21,460 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states. [2019-11-23 23:33:21,473 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2019-11-23 23:33:21,473 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 23:33:21,475 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 23:33:21,476 INFO L410 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 23:33:21,482 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 23:33:21,483 INFO L82 PathProgramCache]: Analyzing trace with hash 925959695, now seen corresponding path program 1 times [2019-11-23 23:33:21,495 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-23 23:33:21,496 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [800793484] [2019-11-23 23:33:21,496 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 23:33:21,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 23:33:21,963 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 23:33:21,963 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [800793484] [2019-11-23 23:33:21,964 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-23 23:33:21,965 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-23 23:33:21,967 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [833774072] [2019-11-23 23:33:21,973 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-23 23:33:21,973 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-23 23:33:21,988 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-23 23:33:21,989 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-11-23 23:33:21,991 INFO L87 Difference]: Start difference. First operand 85 states. Second operand 4 states. [2019-11-23 23:33:22,830 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 23:33:22,830 INFO L93 Difference]: Finished difference Result 333 states and 641 transitions. [2019-11-23 23:33:22,831 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-23 23:33:22,832 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 80 [2019-11-23 23:33:22,833 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 23:33:22,847 INFO L225 Difference]: With dead ends: 333 [2019-11-23 23:33:22,847 INFO L226 Difference]: Without dead ends: 243 [2019-11-23 23:33:22,851 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-11-23 23:33:22,870 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 243 states. [2019-11-23 23:33:22,909 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 243 to 163. [2019-11-23 23:33:22,911 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 163 states. [2019-11-23 23:33:22,913 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 163 states to 163 states and 298 transitions. [2019-11-23 23:33:22,915 INFO L78 Accepts]: Start accepts. Automaton has 163 states and 298 transitions. Word has length 80 [2019-11-23 23:33:22,916 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 23:33:22,916 INFO L462 AbstractCegarLoop]: Abstraction has 163 states and 298 transitions. [2019-11-23 23:33:22,916 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-23 23:33:22,916 INFO L276 IsEmpty]: Start isEmpty. Operand 163 states and 298 transitions. [2019-11-23 23:33:22,920 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2019-11-23 23:33:22,920 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 23:33:22,920 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 23:33:22,920 INFO L410 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 23:33:22,921 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 23:33:22,921 INFO L82 PathProgramCache]: Analyzing trace with hash 1028680452, now seen corresponding path program 1 times [2019-11-23 23:33:22,921 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-23 23:33:22,922 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [717606438] [2019-11-23 23:33:22,922 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 23:33:22,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 23:33:23,031 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-11-23 23:33:23,032 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [717606438] [2019-11-23 23:33:23,032 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-23 23:33:23,032 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2019-11-23 23:33:23,033 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [599309974] [2019-11-23 23:33:23,035 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-23 23:33:23,036 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-23 23:33:23,036 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-23 23:33:23,036 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-23 23:33:23,037 INFO L87 Difference]: Start difference. First operand 163 states and 298 transitions. Second operand 3 states. [2019-11-23 23:33:23,438 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 23:33:23,438 INFO L93 Difference]: Finished difference Result 485 states and 891 transitions. [2019-11-23 23:33:23,438 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-23 23:33:23,439 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 84 [2019-11-23 23:33:23,439 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 23:33:23,442 INFO L225 Difference]: With dead ends: 485 [2019-11-23 23:33:23,442 INFO L226 Difference]: Without dead ends: 323 [2019-11-23 23:33:23,444 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 [2019-11-23 23:33:23,445 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 323 states. [2019-11-23 23:33:23,463 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 323 to 323. [2019-11-23 23:33:23,464 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 323 states. [2019-11-23 23:33:23,465 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 323 states to 323 states and 543 transitions. [2019-11-23 23:33:23,466 INFO L78 Accepts]: Start accepts. Automaton has 323 states and 543 transitions. Word has length 84 [2019-11-23 23:33:23,466 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 23:33:23,466 INFO L462 AbstractCegarLoop]: Abstraction has 323 states and 543 transitions. [2019-11-23 23:33:23,466 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-23 23:33:23,467 INFO L276 IsEmpty]: Start isEmpty. Operand 323 states and 543 transitions. [2019-11-23 23:33:23,470 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2019-11-23 23:33:23,470 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 23:33:23,471 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 23:33:23,471 INFO L410 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 23:33:23,471 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 23:33:23,471 INFO L82 PathProgramCache]: Analyzing trace with hash 221760174, now seen corresponding path program 1 times [2019-11-23 23:33:23,472 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-23 23:33:23,472 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1929511885] [2019-11-23 23:33:23,472 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 23:33:23,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 23:33:23,523 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-23 23:33:23,524 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1929511885] [2019-11-23 23:33:23,524 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-23 23:33:23,524 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-23 23:33:23,524 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1452116844] [2019-11-23 23:33:23,525 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-23 23:33:23,525 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-23 23:33:23,525 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-23 23:33:23,526 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-11-23 23:33:23,526 INFO L87 Difference]: Start difference. First operand 323 states and 543 transitions. Second operand 4 states. [2019-11-23 23:33:24,173 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 23:33:24,173 INFO L93 Difference]: Finished difference Result 1285 states and 2167 transitions. [2019-11-23 23:33:24,175 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-23 23:33:24,175 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 98 [2019-11-23 23:33:24,175 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 23:33:24,180 INFO L225 Difference]: With dead ends: 1285 [2019-11-23 23:33:24,180 INFO L226 Difference]: Without dead ends: 963 [2019-11-23 23:33:24,182 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-11-23 23:33:24,184 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 963 states. [2019-11-23 23:33:24,212 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 963 to 643. [2019-11-23 23:33:24,213 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 643 states. [2019-11-23 23:33:24,218 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 643 states to 643 states and 1033 transitions. [2019-11-23 23:33:24,218 INFO L78 Accepts]: Start accepts. Automaton has 643 states and 1033 transitions. Word has length 98 [2019-11-23 23:33:24,218 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 23:33:24,219 INFO L462 AbstractCegarLoop]: Abstraction has 643 states and 1033 transitions. [2019-11-23 23:33:24,219 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-23 23:33:24,219 INFO L276 IsEmpty]: Start isEmpty. Operand 643 states and 1033 transitions. [2019-11-23 23:33:24,227 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2019-11-23 23:33:24,227 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 23:33:24,227 INFO L410 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 23:33:24,227 INFO L410 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 23:33:24,228 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 23:33:24,228 INFO L82 PathProgramCache]: Analyzing trace with hash 2142817718, now seen corresponding path program 1 times [2019-11-23 23:33:24,229 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-23 23:33:24,229 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1803981096] [2019-11-23 23:33:24,229 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 23:33:24,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 23:33:24,344 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 35 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-23 23:33:24,345 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1803981096] [2019-11-23 23:33:24,345 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-23 23:33:24,345 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-23 23:33:24,345 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1087920992] [2019-11-23 23:33:24,347 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-23 23:33:24,347 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-23 23:33:24,348 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-23 23:33:24,348 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-23 23:33:24,348 INFO L87 Difference]: Start difference. First operand 643 states and 1033 transitions. Second operand 3 states. [2019-11-23 23:33:24,792 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 23:33:24,793 INFO L93 Difference]: Finished difference Result 1285 states and 2065 transitions. [2019-11-23 23:33:24,793 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-23 23:33:24,793 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 113 [2019-11-23 23:33:24,794 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 23:33:24,797 INFO L225 Difference]: With dead ends: 1285 [2019-11-23 23:33:24,797 INFO L226 Difference]: Without dead ends: 643 [2019-11-23 23:33:24,799 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 23:33:24,801 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 643 states. [2019-11-23 23:33:24,817 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 643 to 643. [2019-11-23 23:33:24,817 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 643 states. [2019-11-23 23:33:24,819 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 643 states to 643 states and 953 transitions. [2019-11-23 23:33:24,820 INFO L78 Accepts]: Start accepts. Automaton has 643 states and 953 transitions. Word has length 113 [2019-11-23 23:33:24,820 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 23:33:24,820 INFO L462 AbstractCegarLoop]: Abstraction has 643 states and 953 transitions. [2019-11-23 23:33:24,820 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-23 23:33:24,821 INFO L276 IsEmpty]: Start isEmpty. Operand 643 states and 953 transitions. [2019-11-23 23:33:24,823 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2019-11-23 23:33:24,823 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 23:33:24,823 INFO L410 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 23:33:24,824 INFO L410 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 23:33:24,824 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 23:33:24,824 INFO L82 PathProgramCache]: Analyzing trace with hash -1587445226, now seen corresponding path program 1 times [2019-11-23 23:33:24,825 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-23 23:33:24,825 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [50813162] [2019-11-23 23:33:24,826 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 23:33:24,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 23:33:24,899 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 45 proven. 0 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2019-11-23 23:33:24,900 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [50813162] [2019-11-23 23:33:24,900 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-23 23:33:24,900 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-11-23 23:33:24,900 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1829075914] [2019-11-23 23:33:24,901 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-23 23:33:24,901 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-23 23:33:24,902 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-23 23:33:24,902 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-11-23 23:33:24,902 INFO L87 Difference]: Start difference. First operand 643 states and 953 transitions. Second operand 4 states. [2019-11-23 23:33:25,613 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 23:33:25,613 INFO L93 Difference]: Finished difference Result 2085 states and 3046 transitions. [2019-11-23 23:33:25,614 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-23 23:33:25,614 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 128 [2019-11-23 23:33:25,614 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 23:33:25,621 INFO L225 Difference]: With dead ends: 2085 [2019-11-23 23:33:25,622 INFO L226 Difference]: Without dead ends: 1443 [2019-11-23 23:33:25,623 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-11-23 23:33:25,625 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1443 states. [2019-11-23 23:33:25,659 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1443 to 1443. [2019-11-23 23:33:25,659 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1443 states. [2019-11-23 23:33:25,664 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1443 states to 1443 states and 1918 transitions. [2019-11-23 23:33:25,664 INFO L78 Accepts]: Start accepts. Automaton has 1443 states and 1918 transitions. Word has length 128 [2019-11-23 23:33:25,665 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 23:33:25,665 INFO L462 AbstractCegarLoop]: Abstraction has 1443 states and 1918 transitions. [2019-11-23 23:33:25,665 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-23 23:33:25,665 INFO L276 IsEmpty]: Start isEmpty. Operand 1443 states and 1918 transitions. [2019-11-23 23:33:25,669 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2019-11-23 23:33:25,669 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 23:33:25,669 INFO L410 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 23:33:25,670 INFO L410 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 23:33:25,670 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 23:33:25,670 INFO L82 PathProgramCache]: Analyzing trace with hash -557810632, now seen corresponding path program 1 times [2019-11-23 23:33:25,670 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-23 23:33:25,671 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1303166690] [2019-11-23 23:33:25,671 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 23:33:25,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 23:33:25,787 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 100 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2019-11-23 23:33:25,787 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1303166690] [2019-11-23 23:33:25,788 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-23 23:33:25,789 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-23 23:33:25,789 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1963493166] [2019-11-23 23:33:25,789 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-23 23:33:25,790 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-23 23:33:25,790 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-23 23:33:25,791 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-23 23:33:25,791 INFO L87 Difference]: Start difference. First operand 1443 states and 1918 transitions. Second operand 3 states. [2019-11-23 23:33:26,237 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 23:33:26,237 INFO L93 Difference]: Finished difference Result 2885 states and 3835 transitions. [2019-11-23 23:33:26,238 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-23 23:33:26,238 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 155 [2019-11-23 23:33:26,238 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 23:33:26,245 INFO L225 Difference]: With dead ends: 2885 [2019-11-23 23:33:26,246 INFO L226 Difference]: Without dead ends: 1443 [2019-11-23 23:33:26,248 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 23:33:26,250 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1443 states. [2019-11-23 23:33:26,273 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1443 to 1123. [2019-11-23 23:33:26,273 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1123 states. [2019-11-23 23:33:26,277 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1123 states to 1123 states and 1433 transitions. [2019-11-23 23:33:26,277 INFO L78 Accepts]: Start accepts. Automaton has 1123 states and 1433 transitions. Word has length 155 [2019-11-23 23:33:26,277 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 23:33:26,277 INFO L462 AbstractCegarLoop]: Abstraction has 1123 states and 1433 transitions. [2019-11-23 23:33:26,278 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-23 23:33:26,278 INFO L276 IsEmpty]: Start isEmpty. Operand 1123 states and 1433 transitions. [2019-11-23 23:33:26,281 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 158 [2019-11-23 23:33:26,281 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 23:33:26,281 INFO L410 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 23:33:26,282 INFO L410 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 23:33:26,282 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 23:33:26,282 INFO L82 PathProgramCache]: Analyzing trace with hash 351334122, now seen corresponding path program 1 times [2019-11-23 23:33:26,282 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-23 23:33:26,283 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1363201033] [2019-11-23 23:33:26,283 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 23:33:26,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 23:33:26,334 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 27 proven. 0 refuted. 0 times theorem prover too weak. 89 trivial. 0 not checked. [2019-11-23 23:33:26,335 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1363201033] [2019-11-23 23:33:26,335 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-23 23:33:26,335 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2019-11-23 23:33:26,336 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1250426386] [2019-11-23 23:33:26,336 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-23 23:33:26,336 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-23 23:33:26,337 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-23 23:33:26,337 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-23 23:33:26,337 INFO L87 Difference]: Start difference. First operand 1123 states and 1433 transitions. Second operand 3 states. [2019-11-23 23:33:26,742 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 23:33:26,742 INFO L93 Difference]: Finished difference Result 2725 states and 3435 transitions. [2019-11-23 23:33:26,742 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-23 23:33:26,743 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 157 [2019-11-23 23:33:26,743 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 23:33:26,749 INFO L225 Difference]: With dead ends: 2725 [2019-11-23 23:33:26,749 INFO L226 Difference]: Without dead ends: 1363 [2019-11-23 23:33:26,751 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 1 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 23:33:26,753 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1363 states. [2019-11-23 23:33:26,774 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1363 to 1123. [2019-11-23 23:33:26,774 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1123 states. [2019-11-23 23:33:26,777 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1123 states to 1123 states and 1376 transitions. [2019-11-23 23:33:26,777 INFO L78 Accepts]: Start accepts. Automaton has 1123 states and 1376 transitions. Word has length 157 [2019-11-23 23:33:26,777 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 23:33:26,778 INFO L462 AbstractCegarLoop]: Abstraction has 1123 states and 1376 transitions. [2019-11-23 23:33:26,778 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-23 23:33:26,778 INFO L276 IsEmpty]: Start isEmpty. Operand 1123 states and 1376 transitions. [2019-11-23 23:33:26,781 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 170 [2019-11-23 23:33:26,781 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 23:33:26,781 INFO L410 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 23:33:26,782 INFO L410 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 23:33:26,782 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 23:33:26,782 INFO L82 PathProgramCache]: Analyzing trace with hash 1836754587, now seen corresponding path program 1 times [2019-11-23 23:33:26,782 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-23 23:33:26,783 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [485297736] [2019-11-23 23:33:26,783 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 23:33:26,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 23:33:26,917 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 85 proven. 3 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2019-11-23 23:33:26,918 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [485297736] [2019-11-23 23:33:26,918 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1389395112] [2019-11-23 23:33:26,918 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 23:33:27,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 23:33:27,034 INFO L255 TraceCheckSpWp]: Trace formula consists of 343 conjuncts, 14 conjunts are in the unsatisfiable core [2019-11-23 23:33:27,050 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 23:33:27,080 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-23 23:33:27,132 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 88 proven. 0 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2019-11-23 23:33:27,132 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-23 23:33:27,152 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 4 terms [2019-11-23 23:33:27,217 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 88 proven. 0 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2019-11-23 23:33:27,217 INFO L220 FreeRefinementEngine]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2019-11-23 23:33:27,218 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [6] total 6 [2019-11-23 23:33:27,218 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [732697159] [2019-11-23 23:33:27,219 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-11-23 23:33:27,219 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-23 23:33:27,219 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-11-23 23:33:27,219 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2019-11-23 23:33:27,219 INFO L87 Difference]: Start difference. First operand 1123 states and 1376 transitions. Second operand 5 states. [2019-11-23 23:33:27,855 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 23:33:27,855 INFO L93 Difference]: Finished difference Result 2447 states and 2990 transitions. [2019-11-23 23:33:27,855 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-11-23 23:33:27,855 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 169 [2019-11-23 23:33:27,856 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 23:33:27,862 INFO L225 Difference]: With dead ends: 2447 [2019-11-23 23:33:27,862 INFO L226 Difference]: Without dead ends: 1325 [2019-11-23 23:33:27,864 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 344 GetRequests, 335 SyntacticMatches, 2 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2019-11-23 23:33:27,866 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1325 states. [2019-11-23 23:33:27,890 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1325 to 1203. [2019-11-23 23:33:27,890 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1203 states. [2019-11-23 23:33:27,892 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1203 states to 1203 states and 1460 transitions. [2019-11-23 23:33:27,893 INFO L78 Accepts]: Start accepts. Automaton has 1203 states and 1460 transitions. Word has length 169 [2019-11-23 23:33:27,893 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 23:33:27,893 INFO L462 AbstractCegarLoop]: Abstraction has 1203 states and 1460 transitions. [2019-11-23 23:33:27,893 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-11-23 23:33:27,893 INFO L276 IsEmpty]: Start isEmpty. Operand 1203 states and 1460 transitions. [2019-11-23 23:33:27,896 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 175 [2019-11-23 23:33:27,897 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 23:33:27,897 INFO L410 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 23:33:28,101 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 23:33:28,101 INFO L410 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 23:33:28,102 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 23:33:28,102 INFO L82 PathProgramCache]: Analyzing trace with hash -1200794441, now seen corresponding path program 1 times [2019-11-23 23:33:28,102 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-23 23:33:28,103 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [119243989] [2019-11-23 23:33:28,103 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 23:33:28,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 23:33:28,180 INFO L134 CoverageAnalysis]: Checked inductivity of 172 backedges. 116 proven. 0 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2019-11-23 23:33:28,181 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [119243989] [2019-11-23 23:33:28,181 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-23 23:33:28,181 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-11-23 23:33:28,181 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [277860632] [2019-11-23 23:33:28,182 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-23 23:33:28,182 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-23 23:33:28,182 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-23 23:33:28,182 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-11-23 23:33:28,183 INFO L87 Difference]: Start difference. First operand 1203 states and 1460 transitions. Second operand 4 states. [2019-11-23 23:33:28,769 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 23:33:28,769 INFO L93 Difference]: Finished difference Result 2805 states and 3420 transitions. [2019-11-23 23:33:28,770 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-23 23:33:28,770 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 174 [2019-11-23 23:33:28,770 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 23:33:28,777 INFO L225 Difference]: With dead ends: 2805 [2019-11-23 23:33:28,777 INFO L226 Difference]: Without dead ends: 1363 [2019-11-23 23:33:28,780 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-11-23 23:33:28,782 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1363 states. [2019-11-23 23:33:28,802 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1363 to 1043. [2019-11-23 23:33:28,802 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1043 states. [2019-11-23 23:33:28,804 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1043 states to 1043 states and 1216 transitions. [2019-11-23 23:33:28,804 INFO L78 Accepts]: Start accepts. Automaton has 1043 states and 1216 transitions. Word has length 174 [2019-11-23 23:33:28,805 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 23:33:28,805 INFO L462 AbstractCegarLoop]: Abstraction has 1043 states and 1216 transitions. [2019-11-23 23:33:28,805 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-23 23:33:28,805 INFO L276 IsEmpty]: Start isEmpty. Operand 1043 states and 1216 transitions. [2019-11-23 23:33:28,808 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 198 [2019-11-23 23:33:28,809 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 23:33:28,809 INFO L410 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 23:33:28,809 INFO L410 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 23:33:28,809 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 23:33:28,810 INFO L82 PathProgramCache]: Analyzing trace with hash 703208840, now seen corresponding path program 1 times [2019-11-23 23:33:28,810 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-23 23:33:28,814 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1674354110] [2019-11-23 23:33:28,817 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 23:33:28,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 23:33:28,906 INFO L134 CoverageAnalysis]: Checked inductivity of 215 backedges. 103 proven. 0 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2019-11-23 23:33:28,907 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1674354110] [2019-11-23 23:33:28,908 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-23 23:33:28,908 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2019-11-23 23:33:28,917 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [657288862] [2019-11-23 23:33:28,917 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-23 23:33:28,918 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-23 23:33:28,918 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-23 23:33:28,918 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-23 23:33:28,918 INFO L87 Difference]: Start difference. First operand 1043 states and 1216 transitions. Second operand 3 states. [2019-11-23 23:33:29,251 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 23:33:29,251 INFO L93 Difference]: Finished difference Result 2405 states and 2812 transitions. [2019-11-23 23:33:29,251 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-23 23:33:29,252 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 197 [2019-11-23 23:33:29,252 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 23:33:29,256 INFO L225 Difference]: With dead ends: 2405 [2019-11-23 23:33:29,257 INFO L226 Difference]: Without dead ends: 1283 [2019-11-23 23:33:29,259 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 2 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 23:33:29,260 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1283 states. [2019-11-23 23:33:29,281 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1283 to 1203. [2019-11-23 23:33:29,282 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1203 states. [2019-11-23 23:33:29,284 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1203 states to 1203 states and 1347 transitions. [2019-11-23 23:33:29,284 INFO L78 Accepts]: Start accepts. Automaton has 1203 states and 1347 transitions. Word has length 197 [2019-11-23 23:33:29,284 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 23:33:29,284 INFO L462 AbstractCegarLoop]: Abstraction has 1203 states and 1347 transitions. [2019-11-23 23:33:29,285 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-23 23:33:29,285 INFO L276 IsEmpty]: Start isEmpty. Operand 1203 states and 1347 transitions. [2019-11-23 23:33:29,288 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 203 [2019-11-23 23:33:29,288 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 23:33:29,289 INFO L410 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 23:33:29,289 INFO L410 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 23:33:29,289 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 23:33:29,289 INFO L82 PathProgramCache]: Analyzing trace with hash 1804154703, now seen corresponding path program 1 times [2019-11-23 23:33:29,289 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-23 23:33:29,290 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2085882225] [2019-11-23 23:33:29,290 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 23:33:29,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 23:33:29,507 INFO L134 CoverageAnalysis]: Checked inductivity of 234 backedges. 177 proven. 9 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2019-11-23 23:33:29,508 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2085882225] [2019-11-23 23:33:29,508 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1884677064] [2019-11-23 23:33:29,508 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 [2019-11-23 23:33:29,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 23:33:29,598 INFO L255 TraceCheckSpWp]: Trace formula consists of 398 conjuncts, 2 conjunts are in the unsatisfiable core [2019-11-23 23:33:29,603 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 23:33:29,651 INFO L134 CoverageAnalysis]: Checked inductivity of 234 backedges. 154 proven. 0 refuted. 0 times theorem prover too weak. 80 trivial. 0 not checked. [2019-11-23 23:33:29,651 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-23 23:33:29,693 INFO L134 CoverageAnalysis]: Checked inductivity of 234 backedges. 154 proven. 0 refuted. 0 times theorem prover too weak. 80 trivial. 0 not checked. [2019-11-23 23:33:29,694 INFO L220 FreeRefinementEngine]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2019-11-23 23:33:29,694 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [7] total 10 [2019-11-23 23:33:29,694 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1866187437] [2019-11-23 23:33:29,695 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-23 23:33:29,695 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-23 23:33:29,695 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-23 23:33:29,695 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2019-11-23 23:33:29,695 INFO L87 Difference]: Start difference. First operand 1203 states and 1347 transitions. Second operand 4 states. [2019-11-23 23:33:30,189 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 23:33:30,190 INFO L93 Difference]: Finished difference Result 2565 states and 2878 transitions. [2019-11-23 23:33:30,190 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-23 23:33:30,190 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 202 [2019-11-23 23:33:30,191 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 23:33:30,194 INFO L225 Difference]: With dead ends: 2565 [2019-11-23 23:33:30,194 INFO L226 Difference]: Without dead ends: 883 [2019-11-23 23:33:30,197 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 409 GetRequests, 401 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2019-11-23 23:33:30,198 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 883 states. [2019-11-23 23:33:30,213 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 883 to 883. [2019-11-23 23:33:30,213 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 883 states. [2019-11-23 23:33:30,215 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 883 states to 883 states and 934 transitions. [2019-11-23 23:33:30,215 INFO L78 Accepts]: Start accepts. Automaton has 883 states and 934 transitions. Word has length 202 [2019-11-23 23:33:30,216 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 23:33:30,216 INFO L462 AbstractCegarLoop]: Abstraction has 883 states and 934 transitions. [2019-11-23 23:33:30,216 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-23 23:33:30,216 INFO L276 IsEmpty]: Start isEmpty. Operand 883 states and 934 transitions. [2019-11-23 23:33:30,219 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 214 [2019-11-23 23:33:30,219 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 23:33:30,220 INFO L410 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 23:33:30,427 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 23:33:30,427 INFO L410 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 23:33:30,428 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 23:33:30,428 INFO L82 PathProgramCache]: Analyzing trace with hash -1227007920, now seen corresponding path program 1 times [2019-11-23 23:33:30,428 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-23 23:33:30,429 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2133647956] [2019-11-23 23:33:30,429 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 23:33:30,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 23:33:30,776 INFO L134 CoverageAnalysis]: Checked inductivity of 242 backedges. 174 proven. 68 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-23 23:33:30,776 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2133647956] [2019-11-23 23:33:30,777 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1964879964] [2019-11-23 23:33:30,777 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 [2019-11-23 23:33:30,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 23:33:30,867 INFO L255 TraceCheckSpWp]: Trace formula consists of 387 conjuncts, 13 conjunts are in the unsatisfiable core [2019-11-23 23:33:30,871 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 23:33:30,909 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 3 terms [2019-11-23 23:33:31,008 INFO L134 CoverageAnalysis]: Checked inductivity of 242 backedges. 190 proven. 52 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-23 23:33:31,008 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-23 23:33:31,018 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 6 terms [2019-11-23 23:33:31,037 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 3 terms [2019-11-23 23:33:31,174 INFO L134 CoverageAnalysis]: Checked inductivity of 242 backedges. 190 proven. 52 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-23 23:33:31,175 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1527186296] [2019-11-23 23:33:31,233 INFO L159 IcfgInterpreter]: Started Sifa with 82 locations of interest [2019-11-23 23:33:31,234 INFO L166 IcfgInterpreter]: Building call graph [2019-11-23 23:33:31,239 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-23 23:33:31,247 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-23 23:33:31,247 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-23 23:33:36,903 WARN L138 XnfTransformerHelper]: expecting exponential blowup for input size 46 [2019-11-23 23:33:37,195 WARN L138 XnfTransformerHelper]: expecting exponential blowup for input size 46 [2019-11-23 23:33:37,421 WARN L138 XnfTransformerHelper]: expecting exponential blowup for input size 46 [2019-11-23 23:33:39,026 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-23 23:33:40,112 WARN L192 SmtUtils]: Spent 1.06 s on a formula simplification. DAG size of input: 120 DAG size of output: 107 [2019-11-23 23:33:41,131 WARN L192 SmtUtils]: Spent 980.00 ms on a formula simplification. DAG size of input: 122 DAG size of output: 111 [2019-11-23 23:33:42,035 WARN L192 SmtUtils]: Spent 850.00 ms on a formula simplification. DAG size of input: 120 DAG size of output: 105 [2019-11-23 23:33:42,444 WARN L192 SmtUtils]: Spent 365.00 ms on a formula simplification that was a NOOP. DAG size: 95 [2019-11-23 23:33:42,601 WARN L192 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 80 [2019-11-23 23:33:42,965 WARN L192 SmtUtils]: Spent 274.00 ms on a formula simplification. DAG size of input: 92 DAG size of output: 87 [2019-11-23 23:33:43,309 WARN L192 SmtUtils]: Spent 302.00 ms on a formula simplification. DAG size of input: 99 DAG size of output: 92 [2019-11-23 23:33:43,667 WARN L192 SmtUtils]: Spent 307.00 ms on a formula simplification. DAG size of input: 100 DAG size of output: 95 [2019-11-23 23:33:43,986 WARN L192 SmtUtils]: Spent 273.00 ms on a formula simplification. DAG size of input: 93 DAG size of output: 88 [2019-11-23 23:33:44,443 WARN L192 SmtUtils]: Spent 311.00 ms on a formula simplification. DAG size of input: 99 DAG size of output: 94 [2019-11-23 23:33:44,795 WARN L192 SmtUtils]: Spent 294.00 ms on a formula simplification. DAG size of input: 99 DAG size of output: 92 [2019-11-23 23:33:45,170 WARN L192 SmtUtils]: Spent 277.00 ms on a formula simplification. DAG size of input: 93 DAG size of output: 88 [2019-11-23 23:33:45,526 WARN L192 SmtUtils]: Spent 296.00 ms on a formula simplification. DAG size of input: 99 DAG size of output: 92 [2019-11-23 23:33:45,881 WARN L192 SmtUtils]: Spent 299.00 ms on a formula simplification. DAG size of input: 93 DAG size of output: 88 [2019-11-23 23:33:46,271 WARN L192 SmtUtils]: Spent 324.00 ms on a formula simplification. DAG size of input: 94 DAG size of output: 89 [2019-11-23 23:33:46,663 WARN L192 SmtUtils]: Spent 294.00 ms on a formula simplification. DAG size of input: 108 DAG size of output: 87 [2019-11-23 23:33:47,044 WARN L192 SmtUtils]: Spent 282.00 ms on a formula simplification. DAG size of input: 94 DAG size of output: 89 [2019-11-23 23:33:47,401 WARN L192 SmtUtils]: Spent 268.00 ms on a formula simplification. DAG size of input: 92 DAG size of output: 87 [2019-11-23 23:33:47,760 WARN L192 SmtUtils]: Spent 283.00 ms on a formula simplification. DAG size of input: 93 DAG size of output: 88 [2019-11-23 23:33:48,208 WARN L192 SmtUtils]: Spent 283.00 ms on a formula simplification. DAG size of input: 100 DAG size of output: 88 [2019-11-23 23:33:48,557 WARN L192 SmtUtils]: Spent 269.00 ms on a formula simplification. DAG size of input: 93 DAG size of output: 88 [2019-11-23 23:33:48,943 WARN L192 SmtUtils]: Spent 291.00 ms on a formula simplification. DAG size of input: 99 DAG size of output: 94 [2019-11-23 23:33:49,334 WARN L192 SmtUtils]: Spent 264.00 ms on a formula simplification. DAG size of input: 94 DAG size of output: 89 [2019-11-23 23:33:50,390 WARN L192 SmtUtils]: Spent 945.00 ms on a formula simplification. DAG size of input: 99 DAG size of output: 90 [2019-11-23 23:33:51,383 WARN L192 SmtUtils]: Spent 275.00 ms on a formula simplification. DAG size of input: 93 DAG size of output: 88 [2019-11-23 23:33:51,764 WARN L192 SmtUtils]: Spent 267.00 ms on a formula simplification. DAG size of input: 92 DAG size of output: 87 [2019-11-23 23:33:52,135 WARN L192 SmtUtils]: Spent 278.00 ms on a formula simplification. DAG size of input: 94 DAG size of output: 89 [2019-11-23 23:33:52,712 WARN L192 SmtUtils]: Spent 281.00 ms on a formula simplification. DAG size of input: 94 DAG size of output: 89 [2019-11-23 23:33:53,165 WARN L192 SmtUtils]: Spent 276.00 ms on a formula simplification. DAG size of input: 94 DAG size of output: 89 [2019-11-23 23:33:53,615 WARN L192 SmtUtils]: Spent 314.00 ms on a formula simplification. DAG size of input: 94 DAG size of output: 89 [2019-11-23 23:33:53,655 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 3 imperfect interpolant sequences. [2019-11-23 23:33:53,655 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [31] imperfect sequences [7, 5, 5] total 39 [2019-11-23 23:33:53,656 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [292626214] [2019-11-23 23:33:53,657 INFO L442 AbstractCegarLoop]: Interpolant automaton has 32 states [2019-11-23 23:33:53,658 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-23 23:33:53,658 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2019-11-23 23:33:53,659 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=204, Invalid=1356, Unknown=0, NotChecked=0, Total=1560 [2019-11-23 23:33:53,659 INFO L87 Difference]: Start difference. First operand 883 states and 934 transitions. Second operand 32 states. [2019-11-23 23:33:54,674 WARN L192 SmtUtils]: Spent 712.00 ms on a formula simplification. DAG size of input: 126 DAG size of output: 101 [2019-11-23 23:33:55,572 WARN L192 SmtUtils]: Spent 742.00 ms on a formula simplification. DAG size of input: 130 DAG size of output: 105 [2019-11-23 23:33:56,622 WARN L192 SmtUtils]: Spent 761.00 ms on a formula simplification. DAG size of input: 133 DAG size of output: 110 [2019-11-23 23:33:57,594 WARN L192 SmtUtils]: Spent 777.00 ms on a formula simplification. DAG size of input: 136 DAG size of output: 113 [2019-11-23 23:33:58,477 WARN L192 SmtUtils]: Spent 788.00 ms on a formula simplification. DAG size of input: 137 DAG size of output: 114 [2019-11-23 23:33:59,363 WARN L192 SmtUtils]: Spent 781.00 ms on a formula simplification. DAG size of input: 138 DAG size of output: 115 [2019-11-23 23:34:00,347 WARN L192 SmtUtils]: Spent 789.00 ms on a formula simplification. DAG size of input: 139 DAG size of output: 115 [2019-11-23 23:34:01,611 WARN L192 SmtUtils]: Spent 1.10 s on a formula simplification. DAG size of input: 142 DAG size of output: 118 [2019-11-23 23:34:02,977 WARN L192 SmtUtils]: Spent 1.29 s on a formula simplification. DAG size of input: 130 DAG size of output: 128 [2019-11-23 23:34:04,211 WARN L192 SmtUtils]: Spent 1.07 s on a formula simplification. DAG size of input: 119 DAG size of output: 86 [2019-11-23 23:34:05,417 WARN L192 SmtUtils]: Spent 1.13 s on a formula simplification. DAG size of input: 143 DAG size of output: 119 [2019-11-23 23:34:06,389 WARN L192 SmtUtils]: Spent 892.00 ms on a formula simplification. DAG size of input: 153 DAG size of output: 90 [2019-11-23 23:34:07,673 WARN L192 SmtUtils]: Spent 1.14 s on a formula simplification. DAG size of input: 144 DAG size of output: 120 [2019-11-23 23:34:09,077 WARN L192 SmtUtils]: Spent 1.11 s on a formula simplification. DAG size of input: 145 DAG size of output: 115 [2019-11-23 23:34:10,381 WARN L192 SmtUtils]: Spent 989.00 ms on a formula simplification. DAG size of input: 103 DAG size of output: 87 [2019-11-23 23:34:11,295 WARN L192 SmtUtils]: Spent 832.00 ms on a formula simplification. DAG size of input: 153 DAG size of output: 94 [2019-11-23 23:34:12,281 WARN L192 SmtUtils]: Spent 787.00 ms on a formula simplification. DAG size of input: 131 DAG size of output: 129 [2019-11-23 23:34:13,502 WARN L192 SmtUtils]: Spent 1.06 s on a formula simplification. DAG size of input: 144 DAG size of output: 114 [2019-11-23 23:34:13,852 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 23:34:13,852 INFO L93 Difference]: Finished difference Result 1930 states and 2041 transitions. [2019-11-23 23:34:13,853 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2019-11-23 23:34:13,853 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 213 [2019-11-23 23:34:13,853 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 23:34:13,859 INFO L225 Difference]: With dead ends: 1930 [2019-11-23 23:34:13,859 INFO L226 Difference]: Without dead ends: 1128 [2019-11-23 23:34:13,861 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 662 GetRequests, 575 SyntacticMatches, 31 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1308 ImplicationChecksByTransitivity, 32.5s TimeCoverageRelationStatistics Valid=753, Invalid=2553, Unknown=0, NotChecked=0, Total=3306 [2019-11-23 23:34:13,863 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1128 states. [2019-11-23 23:34:13,881 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1128 to 1023. [2019-11-23 23:34:13,881 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1023 states. [2019-11-23 23:34:13,883 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1023 states to 1023 states and 1079 transitions. [2019-11-23 23:34:13,883 INFO L78 Accepts]: Start accepts. Automaton has 1023 states and 1079 transitions. Word has length 213 [2019-11-23 23:34:13,884 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 23:34:13,884 INFO L462 AbstractCegarLoop]: Abstraction has 1023 states and 1079 transitions. [2019-11-23 23:34:13,884 INFO L463 AbstractCegarLoop]: Interpolant automaton has 32 states. [2019-11-23 23:34:13,884 INFO L276 IsEmpty]: Start isEmpty. Operand 1023 states and 1079 transitions. [2019-11-23 23:34:13,888 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 248 [2019-11-23 23:34:13,888 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 23:34:13,888 INFO L410 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 23:34:14,093 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 23:34:14,093 INFO L410 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 23:34:14,093 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 23:34:14,093 INFO L82 PathProgramCache]: Analyzing trace with hash -469547753, now seen corresponding path program 1 times [2019-11-23 23:34:14,093 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-23 23:34:14,094 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [628937533] [2019-11-23 23:34:14,094 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 23:34:14,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 23:34:14,611 INFO L134 CoverageAnalysis]: Checked inductivity of 375 backedges. 247 proven. 96 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2019-11-23 23:34:14,611 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [628937533] [2019-11-23 23:34:14,612 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1841256309] [2019-11-23 23:34:14,612 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 [2019-11-23 23:34:14,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 23:34:14,764 INFO L255 TraceCheckSpWp]: Trace formula consists of 445 conjuncts, 13 conjunts are in the unsatisfiable core [2019-11-23 23:34:14,771 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 23:34:15,033 INFO L134 CoverageAnalysis]: Checked inductivity of 375 backedges. 271 proven. 72 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2019-11-23 23:34:15,034 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-23 23:34:15,200 INFO L134 CoverageAnalysis]: Checked inductivity of 375 backedges. 271 proven. 72 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2019-11-23 23:34:15,205 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1790679396] [2019-11-23 23:34:15,211 INFO L159 IcfgInterpreter]: Started Sifa with 82 locations of interest [2019-11-23 23:34:15,211 INFO L166 IcfgInterpreter]: Building call graph [2019-11-23 23:34:15,212 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-23 23:34:15,213 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-23 23:34:15,213 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-23 23:34:18,624 WARN L138 XnfTransformerHelper]: expecting exponential blowup for input size 46 [2019-11-23 23:34:18,785 WARN L138 XnfTransformerHelper]: expecting exponential blowup for input size 46 [2019-11-23 23:34:18,956 WARN L138 XnfTransformerHelper]: expecting exponential blowup for input size 46 [2019-11-23 23:34:20,532 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-23 23:34:21,774 WARN L192 SmtUtils]: Spent 1.21 s on a formula simplification. DAG size of input: 132 DAG size of output: 113 [2019-11-23 23:34:22,997 WARN L192 SmtUtils]: Spent 1.19 s on a formula simplification. DAG size of input: 134 DAG size of output: 117 [2019-11-23 23:34:24,067 WARN L192 SmtUtils]: Spent 1.02 s on a formula simplification. DAG size of input: 131 DAG size of output: 110 [2019-11-23 23:34:24,433 WARN L192 SmtUtils]: Spent 326.00 ms on a formula simplification that was a NOOP. DAG size: 95 [2019-11-23 23:34:24,582 WARN L192 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 80 [2019-11-23 23:34:24,945 WARN L192 SmtUtils]: Spent 269.00 ms on a formula simplification. DAG size of input: 92 DAG size of output: 87 [2019-11-23 23:34:25,291 WARN L192 SmtUtils]: Spent 303.00 ms on a formula simplification. DAG size of input: 99 DAG size of output: 92 [2019-11-23 23:34:25,655 WARN L192 SmtUtils]: Spent 311.00 ms on a formula simplification. DAG size of input: 100 DAG size of output: 95 [2019-11-23 23:34:25,972 WARN L192 SmtUtils]: Spent 272.00 ms on a formula simplification. DAG size of input: 93 DAG size of output: 88 [2019-11-23 23:34:26,408 WARN L192 SmtUtils]: Spent 298.00 ms on a formula simplification. DAG size of input: 99 DAG size of output: 94 [2019-11-23 23:34:26,760 WARN L192 SmtUtils]: Spent 296.00 ms on a formula simplification. DAG size of input: 99 DAG size of output: 92 [2019-11-23 23:34:27,151 WARN L192 SmtUtils]: Spent 279.00 ms on a formula simplification. DAG size of input: 93 DAG size of output: 88 [2019-11-23 23:34:27,501 WARN L192 SmtUtils]: Spent 292.00 ms on a formula simplification. DAG size of input: 99 DAG size of output: 92 [2019-11-23 23:34:27,839 WARN L192 SmtUtils]: Spent 273.00 ms on a formula simplification. DAG size of input: 93 DAG size of output: 88 [2019-11-23 23:34:28,189 WARN L192 SmtUtils]: Spent 277.00 ms on a formula simplification. DAG size of input: 94 DAG size of output: 89 [2019-11-23 23:34:28,571 WARN L192 SmtUtils]: Spent 293.00 ms on a formula simplification. DAG size of input: 108 DAG size of output: 87 [2019-11-23 23:34:28,932 WARN L192 SmtUtils]: Spent 275.00 ms on a formula simplification. DAG size of input: 94 DAG size of output: 89 [2019-11-23 23:34:29,313 WARN L192 SmtUtils]: Spent 279.00 ms on a formula simplification. DAG size of input: 92 DAG size of output: 87 [2019-11-23 23:34:29,665 WARN L192 SmtUtils]: Spent 271.00 ms on a formula simplification. DAG size of input: 93 DAG size of output: 88 [2019-11-23 23:34:30,132 WARN L192 SmtUtils]: Spent 298.00 ms on a formula simplification. DAG size of input: 100 DAG size of output: 88 [2019-11-23 23:34:30,469 WARN L192 SmtUtils]: Spent 257.00 ms on a formula simplification. DAG size of input: 93 DAG size of output: 88 [2019-11-23 23:34:30,850 WARN L192 SmtUtils]: Spent 277.00 ms on a formula simplification. DAG size of input: 99 DAG size of output: 94 [2019-11-23 23:34:31,234 WARN L192 SmtUtils]: Spent 272.00 ms on a formula simplification. DAG size of input: 94 DAG size of output: 89 [2019-11-23 23:34:32,557 WARN L192 SmtUtils]: Spent 1.20 s on a formula simplification. DAG size of input: 112 DAG size of output: 96 [2019-11-23 23:34:33,712 WARN L192 SmtUtils]: Spent 288.00 ms on a formula simplification. DAG size of input: 93 DAG size of output: 88 [2019-11-23 23:34:34,088 WARN L192 SmtUtils]: Spent 266.00 ms on a formula simplification. DAG size of input: 92 DAG size of output: 87 [2019-11-23 23:34:34,482 WARN L192 SmtUtils]: Spent 274.00 ms on a formula simplification. DAG size of input: 94 DAG size of output: 89 [2019-11-23 23:34:35,067 WARN L192 SmtUtils]: Spent 291.00 ms on a formula simplification. DAG size of input: 94 DAG size of output: 89 [2019-11-23 23:34:35,517 WARN L192 SmtUtils]: Spent 281.00 ms on a formula simplification. DAG size of input: 94 DAG size of output: 89 [2019-11-23 23:34:35,929 WARN L192 SmtUtils]: Spent 269.00 ms on a formula simplification. DAG size of input: 94 DAG size of output: 89 [2019-11-23 23:34:35,973 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 3 imperfect interpolant sequences. [2019-11-23 23:34:35,974 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [31] imperfect sequences [9, 5, 5] total 41 [2019-11-23 23:34:35,974 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [411765671] [2019-11-23 23:34:35,975 INFO L442 AbstractCegarLoop]: Interpolant automaton has 32 states [2019-11-23 23:34:35,976 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-23 23:34:35,976 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2019-11-23 23:34:35,977 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=245, Invalid=1477, Unknown=0, NotChecked=0, Total=1722 [2019-11-23 23:34:35,977 INFO L87 Difference]: Start difference. First operand 1023 states and 1079 transitions. Second operand 32 states. [2019-11-23 23:34:37,163 WARN L192 SmtUtils]: Spent 850.00 ms on a formula simplification. DAG size of input: 129 DAG size of output: 110 [2019-11-23 23:34:38,255 WARN L192 SmtUtils]: Spent 939.00 ms on a formula simplification. DAG size of input: 133 DAG size of output: 114 [2019-11-23 23:34:39,454 WARN L192 SmtUtils]: Spent 930.00 ms on a formula simplification. DAG size of input: 136 DAG size of output: 117 [2019-11-23 23:34:40,600 WARN L192 SmtUtils]: Spent 948.00 ms on a formula simplification. DAG size of input: 139 DAG size of output: 120 [2019-11-23 23:34:41,699 WARN L192 SmtUtils]: Spent 992.00 ms on a formula simplification. DAG size of input: 140 DAG size of output: 121 [2019-11-23 23:34:42,808 WARN L192 SmtUtils]: Spent 1.01 s on a formula simplification. DAG size of input: 141 DAG size of output: 122 [2019-11-23 23:34:43,987 WARN L192 SmtUtils]: Spent 998.00 ms on a formula simplification. DAG size of input: 142 DAG size of output: 122