/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/array-examples/standard_init1_ground-1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-fb55353 [2019-11-06 18:43:18,269 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-06 18:43:18,272 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-06 18:43:18,284 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-11-06 18:43:18,285 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-11-06 18:43:18,286 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-11-06 18:43:18,288 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-11-06 18:43:18,290 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-11-06 18:43:18,295 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-11-06 18:43:18,296 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-11-06 18:43:18,298 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-11-06 18:43:18,299 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-11-06 18:43:18,300 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-06 18:43:18,302 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-06 18:43:18,304 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-06 18:43:18,306 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-06 18:43:18,309 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-06 18:43:18,311 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-06 18:43:18,315 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-06 18:43:18,317 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-06 18:43:18,321 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-06 18:43:18,325 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-06 18:43:18,328 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-06 18:43:18,328 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-06 18:43:18,333 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-11-06 18:43:18,348 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-06 18:43:18,348 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-06 18:43:18,349 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-06 18:43:18,350 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2019-11-06 18:43:18,372 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-06 18:43:18,372 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-06 18:43:18,375 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-06 18:43:18,375 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-06 18:43:18,375 INFO L138 SettingsManager]: * Use SBE=true [2019-11-06 18:43:18,376 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-06 18:43:18,376 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-06 18:43:18,376 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-06 18:43:18,376 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-06 18:43:18,376 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-06 18:43:18,378 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-06 18:43:18,378 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-06 18:43:18,378 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-06 18:43:18,379 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-06 18:43:18,379 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-06 18:43:18,379 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-06 18:43:18,379 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-06 18:43:18,380 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-06 18:43:18,380 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-06 18:43:18,380 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-06 18:43:18,380 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-06 18:43:18,380 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-06 18:43:18,381 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-06 18:43:18,381 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-06 18:43:18,381 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-06 18:43:18,381 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-06 18:43:18,382 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-06 18:43:18,382 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-06 18:43:18,382 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-11-06 18:43:18,748 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-06 18:43:18,771 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-06 18:43:18,778 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-06 18:43:18,780 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-06 18:43:18,780 INFO L275 PluginConnector]: CDTParser initialized [2019-11-06 18:43:18,781 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-examples/standard_init1_ground-1.i [2019-11-06 18:43:18,862 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5f6b51575/d427228fda924da7b320888f60c5f2dd/FLAGa9a8dd173 [2019-11-06 18:43:19,265 INFO L306 CDTParser]: Found 1 translation units. [2019-11-06 18:43:19,266 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-examples/standard_init1_ground-1.i [2019-11-06 18:43:19,273 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5f6b51575/d427228fda924da7b320888f60c5f2dd/FLAGa9a8dd173 [2019-11-06 18:43:19,627 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5f6b51575/d427228fda924da7b320888f60c5f2dd [2019-11-06 18:43:19,639 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-06 18:43:19,640 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-11-06 18:43:19,641 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-06 18:43:19,642 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-06 18:43:19,646 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-06 18:43:19,648 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 06:43:19" (1/1) ... [2019-11-06 18:43:19,651 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@25f9a9b4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:43:19, skipping insertion in model container [2019-11-06 18:43:19,651 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 06:43:19" (1/1) ... [2019-11-06 18:43:19,659 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-11-06 18:43:19,678 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-11-06 18:43:19,881 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-06 18:43:19,892 INFO L188 MainTranslator]: Completed pre-run [2019-11-06 18:43:19,919 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-06 18:43:19,942 INFO L192 MainTranslator]: Completed translation [2019-11-06 18:43:19,943 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:43:19 WrapperNode [2019-11-06 18:43:19,944 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-06 18:43:19,945 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-06 18:43:19,945 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-06 18:43:19,945 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-06 18:43:20,057 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:43:19" (1/1) ... [2019-11-06 18:43:20,058 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:43:19" (1/1) ... [2019-11-06 18:43:20,066 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:43:19" (1/1) ... [2019-11-06 18:43:20,068 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:43:19" (1/1) ... [2019-11-06 18:43:20,075 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:43:19" (1/1) ... [2019-11-06 18:43:20,080 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:43:19" (1/1) ... [2019-11-06 18:43:20,081 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:43:19" (1/1) ... [2019-11-06 18:43:20,083 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-06 18:43:20,083 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-06 18:43:20,084 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-06 18:43:20,084 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-06 18:43:20,085 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:43:19" (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 [2019-11-06 18:43:20,147 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-11-06 18:43:20,147 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-06 18:43:20,147 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-11-06 18:43:20,147 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-11-06 18:43:20,148 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-11-06 18:43:20,148 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-11-06 18:43:20,148 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-11-06 18:43:20,148 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-11-06 18:43:20,148 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-11-06 18:43:20,148 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-11-06 18:43:20,148 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-11-06 18:43:20,149 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-11-06 18:43:20,149 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-06 18:43:20,384 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-06 18:43:20,384 INFO L284 CfgBuilder]: Removed 2 assume(true) statements. [2019-11-06 18:43:20,385 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 06:43:20 BoogieIcfgContainer [2019-11-06 18:43:20,386 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-06 18:43:20,387 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-06 18:43:20,387 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-06 18:43:20,391 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-06 18:43:20,391 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.11 06:43:19" (1/3) ... [2019-11-06 18:43:20,392 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3d449b20 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 06:43:20, skipping insertion in model container [2019-11-06 18:43:20,392 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:43:19" (2/3) ... [2019-11-06 18:43:20,393 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3d449b20 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 06:43:20, skipping insertion in model container [2019-11-06 18:43:20,393 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 06:43:20" (3/3) ... [2019-11-06 18:43:20,395 INFO L109 eAbstractionObserver]: Analyzing ICFG standard_init1_ground-1.i [2019-11-06 18:43:20,407 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-06 18:43:20,416 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-06 18:43:20,429 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-06 18:43:20,467 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-06 18:43:20,468 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-06 18:43:20,468 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-06 18:43:20,468 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-06 18:43:20,468 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-06 18:43:20,468 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-06 18:43:20,468 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-06 18:43:20,469 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-06 18:43:20,500 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states. [2019-11-06 18:43:20,505 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2019-11-06 18:43:20,505 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:20,506 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:20,508 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:20,512 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:20,512 INFO L82 PathProgramCache]: Analyzing trace with hash -441053002, now seen corresponding path program 1 times [2019-11-06 18:43:20,520 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:20,521 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [990659095] [2019-11-06 18:43:20,521 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:20,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:20,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:20,705 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:43:20,706 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [990659095] [2019-11-06 18:43:20,708 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 18:43:20,708 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-06 18:43:20,709 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [197302046] [2019-11-06 18:43:20,714 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-06 18:43:20,715 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:20,726 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-06 18:43:20,727 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-06 18:43:20,729 INFO L87 Difference]: Start difference. First operand 23 states. Second operand 3 states. [2019-11-06 18:43:20,817 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:20,818 INFO L93 Difference]: Finished difference Result 39 states and 46 transitions. [2019-11-06 18:43:20,818 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-06 18:43:20,820 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 13 [2019-11-06 18:43:20,820 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:20,827 INFO L225 Difference]: With dead ends: 39 [2019-11-06 18:43:20,828 INFO L226 Difference]: Without dead ends: 18 [2019-11-06 18:43:20,831 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-06 18:43:20,847 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2019-11-06 18:43:20,864 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2019-11-06 18:43:20,865 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2019-11-06 18:43:20,866 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2019-11-06 18:43:20,868 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2019-11-06 18:43:20,868 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:20,868 INFO L462 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2019-11-06 18:43:20,868 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-06 18:43:20,869 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2019-11-06 18:43:20,869 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2019-11-06 18:43:20,869 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:20,870 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:20,870 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:20,871 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:20,871 INFO L82 PathProgramCache]: Analyzing trace with hash 303899570, now seen corresponding path program 1 times [2019-11-06 18:43:20,871 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:20,871 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [221042767] [2019-11-06 18:43:20,872 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:20,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:20,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:20,953 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:43:20,953 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [221042767] [2019-11-06 18:43:20,954 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 18:43:20,954 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-11-06 18:43:20,954 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1760415203] [2019-11-06 18:43:20,957 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-06 18:43:20,958 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:20,958 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-06 18:43:20,958 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-11-06 18:43:20,959 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 4 states. [2019-11-06 18:43:21,025 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:21,025 INFO L93 Difference]: Finished difference Result 30 states and 32 transitions. [2019-11-06 18:43:21,026 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-06 18:43:21,026 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 13 [2019-11-06 18:43:21,026 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:21,027 INFO L225 Difference]: With dead ends: 30 [2019-11-06 18:43:21,027 INFO L226 Difference]: Without dead ends: 19 [2019-11-06 18:43:21,028 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-11-06 18:43:21,029 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2019-11-06 18:43:21,033 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2019-11-06 18:43:21,034 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2019-11-06 18:43:21,034 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2019-11-06 18:43:21,035 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 13 [2019-11-06 18:43:21,035 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:21,035 INFO L462 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2019-11-06 18:43:21,035 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-06 18:43:21,035 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2019-11-06 18:43:21,036 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2019-11-06 18:43:21,036 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:21,036 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:21,036 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:21,037 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:21,037 INFO L82 PathProgramCache]: Analyzing trace with hash -1260126610, now seen corresponding path program 1 times [2019-11-06 18:43:21,037 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:21,038 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [995289829] [2019-11-06 18:43:21,038 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:21,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:21,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:21,120 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:43:21,121 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [995289829] [2019-11-06 18:43:21,121 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [738510150] [2019-11-06 18:43:21,121 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 [2019-11-06 18:43:21,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:21,191 INFO L256 TraceCheckSpWp]: Trace formula consists of 56 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-06 18:43:21,198 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:43:21,247 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:43:21,248 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:43:21,248 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2019-11-06 18:43:21,248 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [609199236] [2019-11-06 18:43:21,249 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-11-06 18:43:21,249 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:21,250 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-11-06 18:43:21,250 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-11-06 18:43:21,250 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand 6 states. [2019-11-06 18:43:21,313 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:21,313 INFO L93 Difference]: Finished difference Result 31 states and 33 transitions. [2019-11-06 18:43:21,314 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-11-06 18:43:21,314 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 14 [2019-11-06 18:43:21,314 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:21,315 INFO L225 Difference]: With dead ends: 31 [2019-11-06 18:43:21,315 INFO L226 Difference]: Without dead ends: 20 [2019-11-06 18:43:21,316 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-11-06 18:43:21,316 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2019-11-06 18:43:21,320 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2019-11-06 18:43:21,320 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2019-11-06 18:43:21,321 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2019-11-06 18:43:21,321 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 14 [2019-11-06 18:43:21,322 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:21,322 INFO L462 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2019-11-06 18:43:21,322 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-11-06 18:43:21,322 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2019-11-06 18:43:21,323 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-11-06 18:43:21,323 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:21,323 INFO L410 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:21,534 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:21,534 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:21,535 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:21,535 INFO L82 PathProgramCache]: Analyzing trace with hash 1794669362, now seen corresponding path program 2 times [2019-11-06 18:43:21,535 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:21,535 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [902541162] [2019-11-06 18:43:21,535 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:21,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:21,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:21,633 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:43:21,634 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [902541162] [2019-11-06 18:43:21,634 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1676987781] [2019-11-06 18:43:21,635 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 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 [2019-11-06 18:43:21,675 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 18:43:21,676 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:43:21,676 INFO L256 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 4 conjunts are in the unsatisfiable core [2019-11-06 18:43:21,678 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:43:21,694 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:43:21,694 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:43:21,695 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2019-11-06 18:43:21,695 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [463950996] [2019-11-06 18:43:21,696 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-11-06 18:43:21,696 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:21,696 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-11-06 18:43:21,697 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-11-06 18:43:21,697 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand 7 states. [2019-11-06 18:43:21,784 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:21,784 INFO L93 Difference]: Finished difference Result 32 states and 34 transitions. [2019-11-06 18:43:21,786 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-11-06 18:43:21,787 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 15 [2019-11-06 18:43:21,787 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:21,787 INFO L225 Difference]: With dead ends: 32 [2019-11-06 18:43:21,788 INFO L226 Difference]: Without dead ends: 21 [2019-11-06 18:43:21,789 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-11-06 18:43:21,790 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2019-11-06 18:43:21,795 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2019-11-06 18:43:21,798 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2019-11-06 18:43:21,799 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2019-11-06 18:43:21,799 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 15 [2019-11-06 18:43:21,799 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:21,799 INFO L462 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2019-11-06 18:43:21,799 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-11-06 18:43:21,800 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2019-11-06 18:43:21,800 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-11-06 18:43:21,800 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:21,800 INFO L410 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:22,002 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:22,004 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:22,005 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:22,005 INFO L82 PathProgramCache]: Analyzing trace with hash 2004063982, now seen corresponding path program 3 times [2019-11-06 18:43:22,005 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:22,005 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [292286012] [2019-11-06 18:43:22,006 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:22,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:22,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:22,100 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:43:22,100 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [292286012] [2019-11-06 18:43:22,101 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1958022238] [2019-11-06 18:43:22,101 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2019-11-06 18:43:22,145 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-11-06 18:43:22,146 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:43:22,147 INFO L256 TraceCheckSpWp]: Trace formula consists of 64 conjuncts, 5 conjunts are in the unsatisfiable core [2019-11-06 18:43:22,149 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:43:22,171 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:43:22,172 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:43:22,172 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2019-11-06 18:43:22,172 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1936835387] [2019-11-06 18:43:22,173 INFO L442 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-11-06 18:43:22,173 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:22,174 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-11-06 18:43:22,174 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2019-11-06 18:43:22,174 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 8 states. [2019-11-06 18:43:22,248 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:22,248 INFO L93 Difference]: Finished difference Result 33 states and 35 transitions. [2019-11-06 18:43:22,249 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-11-06 18:43:22,249 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 16 [2019-11-06 18:43:22,249 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:22,250 INFO L225 Difference]: With dead ends: 33 [2019-11-06 18:43:22,250 INFO L226 Difference]: Without dead ends: 22 [2019-11-06 18:43:22,250 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2019-11-06 18:43:22,251 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2019-11-06 18:43:22,254 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2019-11-06 18:43:22,255 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2019-11-06 18:43:22,255 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 23 transitions. [2019-11-06 18:43:22,256 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 23 transitions. Word has length 16 [2019-11-06 18:43:22,256 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:22,256 INFO L462 AbstractCegarLoop]: Abstraction has 22 states and 23 transitions. [2019-11-06 18:43:22,256 INFO L463 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-11-06 18:43:22,256 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 23 transitions. [2019-11-06 18:43:22,257 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2019-11-06 18:43:22,257 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:22,257 INFO L410 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:22,462 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:22,462 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:22,463 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:22,463 INFO L82 PathProgramCache]: Analyzing trace with hash -94637390, now seen corresponding path program 4 times [2019-11-06 18:43:22,463 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:22,464 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [385863209] [2019-11-06 18:43:22,464 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:22,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:22,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:22,579 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:43:22,579 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [385863209] [2019-11-06 18:43:22,580 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1420711851] [2019-11-06 18:43:22,580 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2019-11-06 18:43:22,617 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-06 18:43:22,618 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:43:22,619 INFO L256 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 6 conjunts are in the unsatisfiable core [2019-11-06 18:43:22,620 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:43:22,637 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:43:22,638 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:43:22,638 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2019-11-06 18:43:22,638 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1143671829] [2019-11-06 18:43:22,639 INFO L442 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-11-06 18:43:22,639 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:22,639 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-11-06 18:43:22,639 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2019-11-06 18:43:22,639 INFO L87 Difference]: Start difference. First operand 22 states and 23 transitions. Second operand 9 states. [2019-11-06 18:43:22,712 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:22,713 INFO L93 Difference]: Finished difference Result 34 states and 36 transitions. [2019-11-06 18:43:22,713 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-11-06 18:43:22,713 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 17 [2019-11-06 18:43:22,714 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:22,714 INFO L225 Difference]: With dead ends: 34 [2019-11-06 18:43:22,714 INFO L226 Difference]: Without dead ends: 23 [2019-11-06 18:43:22,715 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2019-11-06 18:43:22,715 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2019-11-06 18:43:22,722 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2019-11-06 18:43:22,722 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2019-11-06 18:43:22,723 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2019-11-06 18:43:22,724 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 17 [2019-11-06 18:43:22,725 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:22,726 INFO L462 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2019-11-06 18:43:22,726 INFO L463 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-11-06 18:43:22,726 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2019-11-06 18:43:22,726 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2019-11-06 18:43:22,727 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:22,727 INFO L410 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:22,927 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:22,928 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:22,928 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:22,929 INFO L82 PathProgramCache]: Analyzing trace with hash -729870482, now seen corresponding path program 5 times [2019-11-06 18:43:22,929 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:22,929 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [619497363] [2019-11-06 18:43:22,929 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:22,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:23,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:23,020 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:43:23,020 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [619497363] [2019-11-06 18:43:23,021 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1040714043] [2019-11-06 18:43:23,021 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:23,065 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2019-11-06 18:43:23,065 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:43:23,067 INFO L256 TraceCheckSpWp]: Trace formula consists of 72 conjuncts, 7 conjunts are in the unsatisfiable core [2019-11-06 18:43:23,068 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:43:23,096 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:43:23,096 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:43:23,097 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2019-11-06 18:43:23,097 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [632599128] [2019-11-06 18:43:23,097 INFO L442 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-11-06 18:43:23,098 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:23,098 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-11-06 18:43:23,098 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2019-11-06 18:43:23,098 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand 10 states. [2019-11-06 18:43:23,194 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:23,194 INFO L93 Difference]: Finished difference Result 35 states and 37 transitions. [2019-11-06 18:43:23,194 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-11-06 18:43:23,194 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 18 [2019-11-06 18:43:23,195 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:23,195 INFO L225 Difference]: With dead ends: 35 [2019-11-06 18:43:23,195 INFO L226 Difference]: Without dead ends: 24 [2019-11-06 18:43:23,197 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2019-11-06 18:43:23,197 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2019-11-06 18:43:23,202 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2019-11-06 18:43:23,203 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2019-11-06 18:43:23,203 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2019-11-06 18:43:23,204 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 18 [2019-11-06 18:43:23,204 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:23,204 INFO L462 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2019-11-06 18:43:23,204 INFO L463 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-11-06 18:43:23,204 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2019-11-06 18:43:23,205 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2019-11-06 18:43:23,205 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:23,205 INFO L410 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:23,409 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:23,409 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:23,409 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:23,410 INFO L82 PathProgramCache]: Analyzing trace with hash 1052740146, now seen corresponding path program 6 times [2019-11-06 18:43:23,410 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:23,410 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [380039379] [2019-11-06 18:43:23,411 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:23,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:23,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:23,538 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:43:23,538 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [380039379] [2019-11-06 18:43:23,538 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1686953539] [2019-11-06 18:43:23,539 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:23,585 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2019-11-06 18:43:23,585 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:43:23,586 INFO L256 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 8 conjunts are in the unsatisfiable core [2019-11-06 18:43:23,587 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:43:23,602 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:43:23,602 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:43:23,602 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 11 [2019-11-06 18:43:23,603 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1437861175] [2019-11-06 18:43:23,603 INFO L442 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-11-06 18:43:23,604 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:23,604 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-11-06 18:43:23,604 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2019-11-06 18:43:23,604 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 11 states. [2019-11-06 18:43:23,695 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:23,696 INFO L93 Difference]: Finished difference Result 36 states and 38 transitions. [2019-11-06 18:43:23,696 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-11-06 18:43:23,696 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 19 [2019-11-06 18:43:23,696 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:23,697 INFO L225 Difference]: With dead ends: 36 [2019-11-06 18:43:23,697 INFO L226 Difference]: Without dead ends: 25 [2019-11-06 18:43:23,697 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2019-11-06 18:43:23,698 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2019-11-06 18:43:23,701 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2019-11-06 18:43:23,701 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2019-11-06 18:43:23,702 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 26 transitions. [2019-11-06 18:43:23,702 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 26 transitions. Word has length 19 [2019-11-06 18:43:23,703 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:23,703 INFO L462 AbstractCegarLoop]: Abstraction has 25 states and 26 transitions. [2019-11-06 18:43:23,703 INFO L463 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-11-06 18:43:23,703 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 26 transitions. [2019-11-06 18:43:23,704 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2019-11-06 18:43:23,704 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:23,704 INFO L410 BasicCegarLoop]: trace histogram [7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:23,912 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:23,913 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:23,913 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:23,914 INFO L82 PathProgramCache]: Analyzing trace with hash 479094766, now seen corresponding path program 7 times [2019-11-06 18:43:23,914 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:23,914 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1322099332] [2019-11-06 18:43:23,915 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:23,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:24,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:24,045 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:43:24,045 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1322099332] [2019-11-06 18:43:24,046 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [184010238] [2019-11-06 18:43:24,046 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:24,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:24,079 INFO L256 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 9 conjunts are in the unsatisfiable core [2019-11-06 18:43:24,080 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:43:24,092 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:43:24,093 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:43:24,093 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 12 [2019-11-06 18:43:24,093 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1601280351] [2019-11-06 18:43:24,094 INFO L442 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-11-06 18:43:24,094 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:24,094 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-11-06 18:43:24,095 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2019-11-06 18:43:24,095 INFO L87 Difference]: Start difference. First operand 25 states and 26 transitions. Second operand 12 states. [2019-11-06 18:43:24,188 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:24,188 INFO L93 Difference]: Finished difference Result 37 states and 39 transitions. [2019-11-06 18:43:24,188 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-11-06 18:43:24,188 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 20 [2019-11-06 18:43:24,189 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:24,189 INFO L225 Difference]: With dead ends: 37 [2019-11-06 18:43:24,189 INFO L226 Difference]: Without dead ends: 26 [2019-11-06 18:43:24,190 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2019-11-06 18:43:24,190 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2019-11-06 18:43:24,193 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2019-11-06 18:43:24,193 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2019-11-06 18:43:24,194 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 27 transitions. [2019-11-06 18:43:24,194 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 27 transitions. Word has length 20 [2019-11-06 18:43:24,194 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:24,195 INFO L462 AbstractCegarLoop]: Abstraction has 26 states and 27 transitions. [2019-11-06 18:43:24,195 INFO L463 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-11-06 18:43:24,195 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 27 transitions. [2019-11-06 18:43:24,195 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2019-11-06 18:43:24,195 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:24,196 INFO L410 BasicCegarLoop]: trace histogram [8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:24,398 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:24,399 INFO L410 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:24,399 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:24,399 INFO L82 PathProgramCache]: Analyzing trace with hash -124042830, now seen corresponding path program 8 times [2019-11-06 18:43:24,399 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:24,399 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1812565501] [2019-11-06 18:43:24,400 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:24,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:24,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:24,503 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:43:24,504 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1812565501] [2019-11-06 18:43:24,504 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1117785169] [2019-11-06 18:43:24,504 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:24,543 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 18:43:24,543 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:43:24,544 INFO L256 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 10 conjunts are in the unsatisfiable core [2019-11-06 18:43:24,546 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:43:24,573 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:43:24,573 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:43:24,573 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 13 [2019-11-06 18:43:24,574 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1177763746] [2019-11-06 18:43:24,574 INFO L442 AbstractCegarLoop]: Interpolant automaton has 13 states [2019-11-06 18:43:24,574 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:24,575 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2019-11-06 18:43:24,575 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2019-11-06 18:43:24,575 INFO L87 Difference]: Start difference. First operand 26 states and 27 transitions. Second operand 13 states. [2019-11-06 18:43:24,634 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:24,634 INFO L93 Difference]: Finished difference Result 38 states and 40 transitions. [2019-11-06 18:43:24,634 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-11-06 18:43:24,635 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 21 [2019-11-06 18:43:24,635 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:24,636 INFO L225 Difference]: With dead ends: 38 [2019-11-06 18:43:24,636 INFO L226 Difference]: Without dead ends: 27 [2019-11-06 18:43:24,637 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2019-11-06 18:43:24,637 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2019-11-06 18:43:24,641 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2019-11-06 18:43:24,641 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2019-11-06 18:43:24,641 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2019-11-06 18:43:24,642 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 21 [2019-11-06 18:43:24,642 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:24,642 INFO L462 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2019-11-06 18:43:24,642 INFO L463 AbstractCegarLoop]: Interpolant automaton has 13 states. [2019-11-06 18:43:24,642 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2019-11-06 18:43:24,643 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2019-11-06 18:43:24,643 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:24,643 INFO L410 BasicCegarLoop]: trace histogram [9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:24,846 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:24,846 INFO L410 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:24,847 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:24,847 INFO L82 PathProgramCache]: Analyzing trace with hash -1641439122, now seen corresponding path program 9 times [2019-11-06 18:43:24,847 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:24,848 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1523366983] [2019-11-06 18:43:24,848 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:24,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:25,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:25,028 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:43:25,030 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1523366983] [2019-11-06 18:43:25,030 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1270809459] [2019-11-06 18:43:25,031 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:25,074 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2019-11-06 18:43:25,075 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:43:25,075 INFO L256 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 11 conjunts are in the unsatisfiable core [2019-11-06 18:43:25,077 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:43:25,089 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:43:25,090 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:43:25,090 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 14 [2019-11-06 18:43:25,090 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [294213234] [2019-11-06 18:43:25,091 INFO L442 AbstractCegarLoop]: Interpolant automaton has 14 states [2019-11-06 18:43:25,091 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:25,091 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2019-11-06 18:43:25,091 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2019-11-06 18:43:25,092 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 14 states. [2019-11-06 18:43:25,183 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:25,183 INFO L93 Difference]: Finished difference Result 39 states and 41 transitions. [2019-11-06 18:43:25,184 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2019-11-06 18:43:25,184 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 22 [2019-11-06 18:43:25,185 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:25,185 INFO L225 Difference]: With dead ends: 39 [2019-11-06 18:43:25,185 INFO L226 Difference]: Without dead ends: 28 [2019-11-06 18:43:25,186 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2019-11-06 18:43:25,186 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2019-11-06 18:43:25,189 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2019-11-06 18:43:25,189 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2019-11-06 18:43:25,190 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 29 transitions. [2019-11-06 18:43:25,190 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 29 transitions. Word has length 22 [2019-11-06 18:43:25,190 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:25,191 INFO L462 AbstractCegarLoop]: Abstraction has 28 states and 29 transitions. [2019-11-06 18:43:25,191 INFO L463 AbstractCegarLoop]: Interpolant automaton has 14 states. [2019-11-06 18:43:25,191 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 29 transitions. [2019-11-06 18:43:25,191 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2019-11-06 18:43:25,192 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:25,192 INFO L410 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:25,401 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:25,401 INFO L410 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:25,402 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:25,402 INFO L82 PathProgramCache]: Analyzing trace with hash -1436083918, now seen corresponding path program 10 times [2019-11-06 18:43:25,402 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:25,403 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [744729762] [2019-11-06 18:43:25,403 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:25,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:25,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:25,519 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:43:25,519 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [744729762] [2019-11-06 18:43:25,519 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [265816648] [2019-11-06 18:43:25,519 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:25,569 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-06 18:43:25,569 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:43:25,570 INFO L256 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 12 conjunts are in the unsatisfiable core [2019-11-06 18:43:25,571 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:43:25,586 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:43:25,586 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:43:25,586 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 15 [2019-11-06 18:43:25,587 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [594440381] [2019-11-06 18:43:25,587 INFO L442 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-11-06 18:43:25,587 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:25,587 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-11-06 18:43:25,588 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2019-11-06 18:43:25,588 INFO L87 Difference]: Start difference. First operand 28 states and 29 transitions. Second operand 15 states. [2019-11-06 18:43:25,693 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:25,694 INFO L93 Difference]: Finished difference Result 40 states and 42 transitions. [2019-11-06 18:43:25,694 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-11-06 18:43:25,694 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 23 [2019-11-06 18:43:25,694 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:25,695 INFO L225 Difference]: With dead ends: 40 [2019-11-06 18:43:25,695 INFO L226 Difference]: Without dead ends: 29 [2019-11-06 18:43:25,695 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2019-11-06 18:43:25,696 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2019-11-06 18:43:25,699 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2019-11-06 18:43:25,699 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2019-11-06 18:43:25,699 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 30 transitions. [2019-11-06 18:43:25,700 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 30 transitions. Word has length 23 [2019-11-06 18:43:25,700 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:25,700 INFO L462 AbstractCegarLoop]: Abstraction has 29 states and 30 transitions. [2019-11-06 18:43:25,700 INFO L463 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-11-06 18:43:25,700 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 30 transitions. [2019-11-06 18:43:25,701 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2019-11-06 18:43:25,701 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:25,701 INFO L410 BasicCegarLoop]: trace histogram [11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:25,901 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:25,902 INFO L410 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:25,903 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:25,903 INFO L82 PathProgramCache]: Analyzing trace with hash 634960110, now seen corresponding path program 11 times [2019-11-06 18:43:25,903 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:25,903 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2077478047] [2019-11-06 18:43:25,904 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:25,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:26,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:26,091 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:43:26,092 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2077478047] [2019-11-06 18:43:26,092 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1873243864] [2019-11-06 18:43:26,092 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:26,180 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 7 check-sat command(s) [2019-11-06 18:43:26,180 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:43:26,181 INFO L256 TraceCheckSpWp]: Trace formula consists of 96 conjuncts, 13 conjunts are in the unsatisfiable core [2019-11-06 18:43:26,186 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:43:26,206 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:43:26,207 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:43:26,207 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 16 [2019-11-06 18:43:26,207 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1911222147] [2019-11-06 18:43:26,208 INFO L442 AbstractCegarLoop]: Interpolant automaton has 16 states [2019-11-06 18:43:26,209 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:26,209 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2019-11-06 18:43:26,209 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2019-11-06 18:43:26,210 INFO L87 Difference]: Start difference. First operand 29 states and 30 transitions. Second operand 16 states. [2019-11-06 18:43:26,308 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:26,308 INFO L93 Difference]: Finished difference Result 41 states and 43 transitions. [2019-11-06 18:43:26,309 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2019-11-06 18:43:26,309 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 24 [2019-11-06 18:43:26,310 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:26,310 INFO L225 Difference]: With dead ends: 41 [2019-11-06 18:43:26,311 INFO L226 Difference]: Without dead ends: 30 [2019-11-06 18:43:26,311 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2019-11-06 18:43:26,312 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2019-11-06 18:43:26,315 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2019-11-06 18:43:26,315 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2019-11-06 18:43:26,315 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2019-11-06 18:43:26,316 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 24 [2019-11-06 18:43:26,316 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:26,316 INFO L462 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2019-11-06 18:43:26,316 INFO L463 AbstractCegarLoop]: Interpolant automaton has 16 states. [2019-11-06 18:43:26,316 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2019-11-06 18:43:26,317 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2019-11-06 18:43:26,317 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:26,317 INFO L410 BasicCegarLoop]: trace histogram [12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:26,521 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:26,521 INFO L410 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:26,522 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:26,522 INFO L82 PathProgramCache]: Analyzing trace with hash 412815538, now seen corresponding path program 12 times [2019-11-06 18:43:26,522 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:26,522 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [475027698] [2019-11-06 18:43:26,522 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:26,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:26,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:26,657 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:43:26,657 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [475027698] [2019-11-06 18:43:26,658 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [55051969] [2019-11-06 18:43:26,658 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:26,739 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2019-11-06 18:43:26,740 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:43:26,740 INFO L256 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 14 conjunts are in the unsatisfiable core [2019-11-06 18:43:26,742 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:43:26,755 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:43:26,755 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:43:26,756 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 17 [2019-11-06 18:43:26,756 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [873656297] [2019-11-06 18:43:26,756 INFO L442 AbstractCegarLoop]: Interpolant automaton has 17 states [2019-11-06 18:43:26,756 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:26,757 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2019-11-06 18:43:26,757 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2019-11-06 18:43:26,757 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand 17 states. [2019-11-06 18:43:26,827 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:26,827 INFO L93 Difference]: Finished difference Result 42 states and 44 transitions. [2019-11-06 18:43:26,827 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2019-11-06 18:43:26,827 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 25 [2019-11-06 18:43:26,828 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:26,828 INFO L225 Difference]: With dead ends: 42 [2019-11-06 18:43:26,828 INFO L226 Difference]: Without dead ends: 31 [2019-11-06 18:43:26,829 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2019-11-06 18:43:26,829 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2019-11-06 18:43:26,832 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2019-11-06 18:43:26,832 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2019-11-06 18:43:26,833 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 32 transitions. [2019-11-06 18:43:26,833 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 32 transitions. Word has length 25 [2019-11-06 18:43:26,833 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:26,833 INFO L462 AbstractCegarLoop]: Abstraction has 31 states and 32 transitions. [2019-11-06 18:43:26,834 INFO L463 AbstractCegarLoop]: Interpolant automaton has 17 states. [2019-11-06 18:43:26,834 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 32 transitions. [2019-11-06 18:43:26,834 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2019-11-06 18:43:26,834 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:26,835 INFO L410 BasicCegarLoop]: trace histogram [13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:27,038 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:27,039 INFO L410 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:27,039 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:27,039 INFO L82 PathProgramCache]: Analyzing trace with hash 2116268398, now seen corresponding path program 13 times [2019-11-06 18:43:27,039 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:27,039 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2010770143] [2019-11-06 18:43:27,039 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:27,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:27,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:27,206 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:43:27,207 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2010770143] [2019-11-06 18:43:27,207 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [53709527] [2019-11-06 18:43:27,207 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:27,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:27,250 INFO L256 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 15 conjunts are in the unsatisfiable core [2019-11-06 18:43:27,257 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:43:27,294 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:43:27,295 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:43:27,295 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 18 [2019-11-06 18:43:27,296 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [616399883] [2019-11-06 18:43:27,296 INFO L442 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-11-06 18:43:27,296 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:27,296 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-11-06 18:43:27,297 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2019-11-06 18:43:27,297 INFO L87 Difference]: Start difference. First operand 31 states and 32 transitions. Second operand 18 states. [2019-11-06 18:43:27,412 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:27,412 INFO L93 Difference]: Finished difference Result 43 states and 45 transitions. [2019-11-06 18:43:27,412 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-11-06 18:43:27,413 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 26 [2019-11-06 18:43:27,413 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:27,414 INFO L225 Difference]: With dead ends: 43 [2019-11-06 18:43:27,414 INFO L226 Difference]: Without dead ends: 32 [2019-11-06 18:43:27,415 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2019-11-06 18:43:27,415 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2019-11-06 18:43:27,418 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2019-11-06 18:43:27,418 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2019-11-06 18:43:27,419 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 33 transitions. [2019-11-06 18:43:27,419 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 33 transitions. Word has length 26 [2019-11-06 18:43:27,419 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:27,419 INFO L462 AbstractCegarLoop]: Abstraction has 32 states and 33 transitions. [2019-11-06 18:43:27,419 INFO L463 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-11-06 18:43:27,419 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 33 transitions. [2019-11-06 18:43:27,420 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2019-11-06 18:43:27,420 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:27,420 INFO L410 BasicCegarLoop]: trace histogram [14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:27,627 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:27,627 INFO L410 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:27,628 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:27,628 INFO L82 PathProgramCache]: Analyzing trace with hash -911267790, now seen corresponding path program 14 times [2019-11-06 18:43:27,628 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:27,629 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1164934048] [2019-11-06 18:43:27,629 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:27,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:28,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:28,096 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:43:28,097 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1164934048] [2019-11-06 18:43:28,097 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [160114288] [2019-11-06 18:43:28,097 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:28,153 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 18:43:28,154 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:43:28,155 INFO L256 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 16 conjunts are in the unsatisfiable core [2019-11-06 18:43:28,163 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:43:28,193 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:43:28,196 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:43:28,197 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 19 [2019-11-06 18:43:28,197 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2064660974] [2019-11-06 18:43:28,198 INFO L442 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-11-06 18:43:28,198 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:28,198 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-11-06 18:43:28,201 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2019-11-06 18:43:28,202 INFO L87 Difference]: Start difference. First operand 32 states and 33 transitions. Second operand 19 states. [2019-11-06 18:43:28,305 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:28,305 INFO L93 Difference]: Finished difference Result 44 states and 46 transitions. [2019-11-06 18:43:28,305 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-11-06 18:43:28,306 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 27 [2019-11-06 18:43:28,306 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:28,306 INFO L225 Difference]: With dead ends: 44 [2019-11-06 18:43:28,306 INFO L226 Difference]: Without dead ends: 33 [2019-11-06 18:43:28,309 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2019-11-06 18:43:28,309 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2019-11-06 18:43:28,313 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2019-11-06 18:43:28,313 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2019-11-06 18:43:28,314 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2019-11-06 18:43:28,314 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 27 [2019-11-06 18:43:28,314 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:28,314 INFO L462 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2019-11-06 18:43:28,314 INFO L463 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-11-06 18:43:28,315 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2019-11-06 18:43:28,315 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2019-11-06 18:43:28,315 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:28,315 INFO L410 BasicCegarLoop]: trace histogram [15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:28,516 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:28,517 INFO L410 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:28,517 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:28,517 INFO L82 PathProgramCache]: Analyzing trace with hash -275609106, now seen corresponding path program 15 times [2019-11-06 18:43:28,517 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:28,518 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [729172720] [2019-11-06 18:43:28,518 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:28,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:28,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:28,747 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:43:28,747 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [729172720] [2019-11-06 18:43:28,748 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1778545193] [2019-11-06 18:43:28,748 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:28,989 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2019-11-06 18:43:28,990 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:43:28,991 INFO L256 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 17 conjunts are in the unsatisfiable core [2019-11-06 18:43:28,993 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:43:29,015 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:43:29,016 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:43:29,016 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 20 [2019-11-06 18:43:29,016 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1270692450] [2019-11-06 18:43:29,017 INFO L442 AbstractCegarLoop]: Interpolant automaton has 20 states [2019-11-06 18:43:29,017 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:29,017 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2019-11-06 18:43:29,017 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2019-11-06 18:43:29,018 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 20 states. [2019-11-06 18:43:29,140 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:29,140 INFO L93 Difference]: Finished difference Result 45 states and 47 transitions. [2019-11-06 18:43:29,140 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2019-11-06 18:43:29,141 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 28 [2019-11-06 18:43:29,141 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:29,141 INFO L225 Difference]: With dead ends: 45 [2019-11-06 18:43:29,141 INFO L226 Difference]: Without dead ends: 34 [2019-11-06 18:43:29,142 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2019-11-06 18:43:29,142 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2019-11-06 18:43:29,145 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2019-11-06 18:43:29,146 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2019-11-06 18:43:29,146 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 35 transitions. [2019-11-06 18:43:29,147 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 35 transitions. Word has length 28 [2019-11-06 18:43:29,147 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:29,147 INFO L462 AbstractCegarLoop]: Abstraction has 34 states and 35 transitions. [2019-11-06 18:43:29,147 INFO L463 AbstractCegarLoop]: Interpolant automaton has 20 states. [2019-11-06 18:43:29,147 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 35 transitions. [2019-11-06 18:43:29,148 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2019-11-06 18:43:29,148 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:29,148 INFO L410 BasicCegarLoop]: trace histogram [16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:29,353 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:29,353 INFO L410 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:29,354 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:29,354 INFO L82 PathProgramCache]: Analyzing trace with hash -2045026382, now seen corresponding path program 16 times [2019-11-06 18:43:29,354 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:29,354 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2027601556] [2019-11-06 18:43:29,354 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:29,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:29,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:29,556 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:43:29,556 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2027601556] [2019-11-06 18:43:29,557 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [968965403] [2019-11-06 18:43:29,557 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:29,595 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-06 18:43:29,595 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:43:29,596 INFO L256 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 18 conjunts are in the unsatisfiable core [2019-11-06 18:43:29,597 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:43:29,613 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:43:29,614 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:43:29,614 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19] total 21 [2019-11-06 18:43:29,614 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1759975846] [2019-11-06 18:43:29,615 INFO L442 AbstractCegarLoop]: Interpolant automaton has 21 states [2019-11-06 18:43:29,615 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:29,615 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2019-11-06 18:43:29,615 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2019-11-06 18:43:29,616 INFO L87 Difference]: Start difference. First operand 34 states and 35 transitions. Second operand 21 states. [2019-11-06 18:43:29,737 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:29,738 INFO L93 Difference]: Finished difference Result 46 states and 48 transitions. [2019-11-06 18:43:29,738 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2019-11-06 18:43:29,738 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 29 [2019-11-06 18:43:29,739 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:29,739 INFO L225 Difference]: With dead ends: 46 [2019-11-06 18:43:29,740 INFO L226 Difference]: Without dead ends: 35 [2019-11-06 18:43:29,740 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2019-11-06 18:43:29,741 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2019-11-06 18:43:29,744 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2019-11-06 18:43:29,745 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2019-11-06 18:43:29,745 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 36 transitions. [2019-11-06 18:43:29,745 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 36 transitions. Word has length 29 [2019-11-06 18:43:29,746 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:29,746 INFO L462 AbstractCegarLoop]: Abstraction has 35 states and 36 transitions. [2019-11-06 18:43:29,746 INFO L463 AbstractCegarLoop]: Interpolant automaton has 21 states. [2019-11-06 18:43:29,746 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 36 transitions. [2019-11-06 18:43:29,747 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2019-11-06 18:43:29,747 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:29,747 INFO L410 BasicCegarLoop]: trace histogram [17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:29,954 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:29,955 INFO L410 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:29,955 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:29,955 INFO L82 PathProgramCache]: Analyzing trace with hash -1062387090, now seen corresponding path program 17 times [2019-11-06 18:43:29,956 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:29,956 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [541796514] [2019-11-06 18:43:29,957 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:29,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:30,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:30,222 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:43:30,223 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [541796514] [2019-11-06 18:43:30,223 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1962151465] [2019-11-06 18:43:30,224 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:30,345 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 10 check-sat command(s) [2019-11-06 18:43:30,345 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:43:30,347 INFO L256 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 19 conjunts are in the unsatisfiable core [2019-11-06 18:43:30,348 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:43:30,364 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:43:30,365 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:43:30,365 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20] total 22 [2019-11-06 18:43:30,365 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1647639814] [2019-11-06 18:43:30,366 INFO L442 AbstractCegarLoop]: Interpolant automaton has 22 states [2019-11-06 18:43:30,366 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:30,366 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2019-11-06 18:43:30,366 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2019-11-06 18:43:30,367 INFO L87 Difference]: Start difference. First operand 35 states and 36 transitions. Second operand 22 states. [2019-11-06 18:43:30,471 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:30,472 INFO L93 Difference]: Finished difference Result 47 states and 49 transitions. [2019-11-06 18:43:30,472 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2019-11-06 18:43:30,472 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 30 [2019-11-06 18:43:30,473 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:30,473 INFO L225 Difference]: With dead ends: 47 [2019-11-06 18:43:30,473 INFO L226 Difference]: Without dead ends: 36 [2019-11-06 18:43:30,474 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2019-11-06 18:43:30,474 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2019-11-06 18:43:30,482 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2019-11-06 18:43:30,482 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2019-11-06 18:43:30,486 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2019-11-06 18:43:30,486 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 30 [2019-11-06 18:43:30,486 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:30,487 INFO L462 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2019-11-06 18:43:30,487 INFO L463 AbstractCegarLoop]: Interpolant automaton has 22 states. [2019-11-06 18:43:30,487 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2019-11-06 18:43:30,487 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2019-11-06 18:43:30,487 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:30,488 INFO L410 BasicCegarLoop]: trace histogram [18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:30,690 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:30,691 INFO L410 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:30,691 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:30,691 INFO L82 PathProgramCache]: Analyzing trace with hash -665340110, now seen corresponding path program 18 times [2019-11-06 18:43:30,691 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:30,692 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1404291199] [2019-11-06 18:43:30,692 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:30,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:30,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:30,916 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:43:30,916 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1404291199] [2019-11-06 18:43:30,916 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1125539157] [2019-11-06 18:43:30,917 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:31,207 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 10 check-sat command(s) [2019-11-06 18:43:31,207 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:43:31,212 INFO L256 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 20 conjunts are in the unsatisfiable core [2019-11-06 18:43:31,213 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:43:31,238 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:43:31,238 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:43:31,239 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21] total 23 [2019-11-06 18:43:31,239 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [80303434] [2019-11-06 18:43:31,239 INFO L442 AbstractCegarLoop]: Interpolant automaton has 23 states [2019-11-06 18:43:31,239 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:31,240 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2019-11-06 18:43:31,240 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2019-11-06 18:43:31,240 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand 23 states. [2019-11-06 18:43:31,340 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:31,341 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2019-11-06 18:43:31,341 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2019-11-06 18:43:31,341 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 31 [2019-11-06 18:43:31,341 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:31,342 INFO L225 Difference]: With dead ends: 48 [2019-11-06 18:43:31,342 INFO L226 Difference]: Without dead ends: 37 [2019-11-06 18:43:31,343 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2019-11-06 18:43:31,343 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2019-11-06 18:43:31,346 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2019-11-06 18:43:31,346 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2019-11-06 18:43:31,347 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 38 transitions. [2019-11-06 18:43:31,347 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 38 transitions. Word has length 31 [2019-11-06 18:43:31,347 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:31,347 INFO L462 AbstractCegarLoop]: Abstraction has 37 states and 38 transitions. [2019-11-06 18:43:31,347 INFO L463 AbstractCegarLoop]: Interpolant automaton has 23 states. [2019-11-06 18:43:31,347 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 38 transitions. [2019-11-06 18:43:31,348 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2019-11-06 18:43:31,348 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:31,348 INFO L410 BasicCegarLoop]: trace histogram [19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:31,548 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:31,549 INFO L410 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:31,549 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:31,549 INFO L82 PathProgramCache]: Analyzing trace with hash -1241785618, now seen corresponding path program 19 times [2019-11-06 18:43:31,550 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:31,550 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1405897840] [2019-11-06 18:43:31,550 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:31,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:31,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:31,792 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:43:31,792 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1405897840] [2019-11-06 18:43:31,792 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [968253254] [2019-11-06 18:43:31,792 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:31,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:31,865 INFO L256 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 21 conjunts are in the unsatisfiable core [2019-11-06 18:43:31,867 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:43:31,888 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:43:31,888 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:43:31,888 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22] total 24 [2019-11-06 18:43:31,889 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [115561985] [2019-11-06 18:43:31,889 INFO L442 AbstractCegarLoop]: Interpolant automaton has 24 states [2019-11-06 18:43:31,889 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:31,889 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2019-11-06 18:43:31,889 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=255, Invalid=297, Unknown=0, NotChecked=0, Total=552 [2019-11-06 18:43:31,889 INFO L87 Difference]: Start difference. First operand 37 states and 38 transitions. Second operand 24 states. [2019-11-06 18:43:31,977 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:31,978 INFO L93 Difference]: Finished difference Result 49 states and 51 transitions. [2019-11-06 18:43:31,978 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2019-11-06 18:43:31,978 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 32 [2019-11-06 18:43:31,978 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:31,979 INFO L225 Difference]: With dead ends: 49 [2019-11-06 18:43:31,979 INFO L226 Difference]: Without dead ends: 38 [2019-11-06 18:43:31,979 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=255, Invalid=297, Unknown=0, NotChecked=0, Total=552 [2019-11-06 18:43:31,980 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2019-11-06 18:43:31,982 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2019-11-06 18:43:31,982 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2019-11-06 18:43:31,983 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 39 transitions. [2019-11-06 18:43:31,983 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 39 transitions. Word has length 32 [2019-11-06 18:43:31,983 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:31,983 INFO L462 AbstractCegarLoop]: Abstraction has 38 states and 39 transitions. [2019-11-06 18:43:31,983 INFO L463 AbstractCegarLoop]: Interpolant automaton has 24 states. [2019-11-06 18:43:31,983 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 39 transitions. [2019-11-06 18:43:31,984 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2019-11-06 18:43:31,984 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:31,984 INFO L410 BasicCegarLoop]: trace histogram [20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:32,187 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:32,187 INFO L410 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:32,187 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:32,188 INFO L82 PathProgramCache]: Analyzing trace with hash -1931727182, now seen corresponding path program 20 times [2019-11-06 18:43:32,188 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:32,188 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [502414111] [2019-11-06 18:43:32,188 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:32,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:32,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:32,532 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:43:32,532 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [502414111] [2019-11-06 18:43:32,532 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1352191165] [2019-11-06 18:43:32,532 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:32,581 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 18:43:32,582 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:43:32,583 INFO L256 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 22 conjunts are in the unsatisfiable core [2019-11-06 18:43:32,584 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:43:32,597 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:43:32,598 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:43:32,598 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23] total 25 [2019-11-06 18:43:32,598 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1871163350] [2019-11-06 18:43:32,598 INFO L442 AbstractCegarLoop]: Interpolant automaton has 25 states [2019-11-06 18:43:32,598 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:32,599 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2019-11-06 18:43:32,599 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=278, Invalid=322, Unknown=0, NotChecked=0, Total=600 [2019-11-06 18:43:32,599 INFO L87 Difference]: Start difference. First operand 38 states and 39 transitions. Second operand 25 states. [2019-11-06 18:43:32,721 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:32,722 INFO L93 Difference]: Finished difference Result 50 states and 52 transitions. [2019-11-06 18:43:32,723 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2019-11-06 18:43:32,724 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 33 [2019-11-06 18:43:32,724 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:32,724 INFO L225 Difference]: With dead ends: 50 [2019-11-06 18:43:32,724 INFO L226 Difference]: Without dead ends: 39 [2019-11-06 18:43:32,725 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 58 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=278, Invalid=322, Unknown=0, NotChecked=0, Total=600 [2019-11-06 18:43:32,725 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2019-11-06 18:43:32,727 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2019-11-06 18:43:32,727 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2019-11-06 18:43:32,727 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2019-11-06 18:43:32,728 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 33 [2019-11-06 18:43:32,728 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:32,728 INFO L462 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2019-11-06 18:43:32,728 INFO L463 AbstractCegarLoop]: Interpolant automaton has 25 states. [2019-11-06 18:43:32,728 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2019-11-06 18:43:32,729 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2019-11-06 18:43:32,729 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:32,729 INFO L410 BasicCegarLoop]: trace histogram [21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:32,933 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:32,933 INFO L410 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:32,934 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:32,934 INFO L82 PathProgramCache]: Analyzing trace with hash -1845079186, now seen corresponding path program 21 times [2019-11-06 18:43:32,934 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:32,934 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1928035956] [2019-11-06 18:43:32,935 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:32,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:33,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:33,258 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:43:33,258 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1928035956] [2019-11-06 18:43:33,258 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1984346717] [2019-11-06 18:43:33,259 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:34,043 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2019-11-06 18:43:34,043 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:43:34,045 INFO L256 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 23 conjunts are in the unsatisfiable core [2019-11-06 18:43:34,047 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:43:34,065 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:43:34,066 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:43:34,066 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 24] total 26 [2019-11-06 18:43:34,066 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [75938813] [2019-11-06 18:43:34,067 INFO L442 AbstractCegarLoop]: Interpolant automaton has 26 states [2019-11-06 18:43:34,067 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:34,067 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2019-11-06 18:43:34,068 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=302, Invalid=348, Unknown=0, NotChecked=0, Total=650 [2019-11-06 18:43:34,068 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 26 states. [2019-11-06 18:43:34,191 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:34,192 INFO L93 Difference]: Finished difference Result 51 states and 53 transitions. [2019-11-06 18:43:34,192 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2019-11-06 18:43:34,192 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 34 [2019-11-06 18:43:34,192 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:34,193 INFO L225 Difference]: With dead ends: 51 [2019-11-06 18:43:34,193 INFO L226 Difference]: Without dead ends: 40 [2019-11-06 18:43:34,194 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=302, Invalid=348, Unknown=0, NotChecked=0, Total=650 [2019-11-06 18:43:34,194 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2019-11-06 18:43:34,197 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2019-11-06 18:43:34,197 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2019-11-06 18:43:34,198 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 41 transitions. [2019-11-06 18:43:34,198 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 41 transitions. Word has length 34 [2019-11-06 18:43:34,198 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:34,198 INFO L462 AbstractCegarLoop]: Abstraction has 40 states and 41 transitions. [2019-11-06 18:43:34,198 INFO L463 AbstractCegarLoop]: Interpolant automaton has 26 states. [2019-11-06 18:43:34,199 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 41 transitions. [2019-11-06 18:43:34,199 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2019-11-06 18:43:34,199 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:34,199 INFO L410 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:34,404 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:34,405 INFO L410 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:34,405 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:34,405 INFO L82 PathProgramCache]: Analyzing trace with hash 841008690, now seen corresponding path program 22 times [2019-11-06 18:43:34,406 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:34,406 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1728295343] [2019-11-06 18:43:34,406 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:34,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:34,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:34,805 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:43:34,805 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1728295343] [2019-11-06 18:43:34,806 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [180141468] [2019-11-06 18:43:34,806 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:34,869 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-06 18:43:34,870 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:43:34,871 INFO L256 TraceCheckSpWp]: Trace formula consists of 140 conjuncts, 24 conjunts are in the unsatisfiable core [2019-11-06 18:43:34,872 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:43:34,886 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:43:34,887 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:43:34,887 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 25] total 27 [2019-11-06 18:43:34,887 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1958503319] [2019-11-06 18:43:34,887 INFO L442 AbstractCegarLoop]: Interpolant automaton has 27 states [2019-11-06 18:43:34,888 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:34,888 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2019-11-06 18:43:34,888 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=327, Invalid=375, Unknown=0, NotChecked=0, Total=702 [2019-11-06 18:43:34,888 INFO L87 Difference]: Start difference. First operand 40 states and 41 transitions. Second operand 27 states. [2019-11-06 18:43:35,028 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:35,028 INFO L93 Difference]: Finished difference Result 52 states and 54 transitions. [2019-11-06 18:43:35,028 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2019-11-06 18:43:35,029 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 35 [2019-11-06 18:43:35,029 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:35,030 INFO L225 Difference]: With dead ends: 52 [2019-11-06 18:43:35,030 INFO L226 Difference]: Without dead ends: 41 [2019-11-06 18:43:35,030 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=327, Invalid=375, Unknown=0, NotChecked=0, Total=702 [2019-11-06 18:43:35,032 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2019-11-06 18:43:35,035 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2019-11-06 18:43:35,035 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2019-11-06 18:43:35,036 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 42 transitions. [2019-11-06 18:43:35,036 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 42 transitions. Word has length 35 [2019-11-06 18:43:35,036 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:35,036 INFO L462 AbstractCegarLoop]: Abstraction has 41 states and 42 transitions. [2019-11-06 18:43:35,036 INFO L463 AbstractCegarLoop]: Interpolant automaton has 27 states. [2019-11-06 18:43:35,036 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 42 transitions. [2019-11-06 18:43:35,037 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2019-11-06 18:43:35,037 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:35,037 INFO L410 BasicCegarLoop]: trace histogram [23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:35,240 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:35,241 INFO L410 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:35,241 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:35,242 INFO L82 PathProgramCache]: Analyzing trace with hash -1789613074, now seen corresponding path program 23 times [2019-11-06 18:43:35,242 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:35,242 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1238616454] [2019-11-06 18:43:35,242 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:35,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:35,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:35,590 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:43:35,590 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1238616454] [2019-11-06 18:43:35,590 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1947213775] [2019-11-06 18:43:35,591 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:35,837 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 13 check-sat command(s) [2019-11-06 18:43:35,837 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:43:35,839 INFO L256 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 25 conjunts are in the unsatisfiable core [2019-11-06 18:43:35,840 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:43:35,855 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:43:35,856 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:43:35,856 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26] total 28 [2019-11-06 18:43:35,856 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [713563846] [2019-11-06 18:43:35,856 INFO L442 AbstractCegarLoop]: Interpolant automaton has 28 states [2019-11-06 18:43:35,857 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:35,857 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2019-11-06 18:43:35,857 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=353, Invalid=403, Unknown=0, NotChecked=0, Total=756 [2019-11-06 18:43:35,857 INFO L87 Difference]: Start difference. First operand 41 states and 42 transitions. Second operand 28 states. [2019-11-06 18:43:35,972 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:35,972 INFO L93 Difference]: Finished difference Result 53 states and 55 transitions. [2019-11-06 18:43:35,972 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2019-11-06 18:43:35,973 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 36 [2019-11-06 18:43:35,973 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:35,973 INFO L225 Difference]: With dead ends: 53 [2019-11-06 18:43:35,973 INFO L226 Difference]: Without dead ends: 42 [2019-11-06 18:43:35,974 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=353, Invalid=403, Unknown=0, NotChecked=0, Total=756 [2019-11-06 18:43:35,974 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2019-11-06 18:43:35,977 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2019-11-06 18:43:35,977 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2019-11-06 18:43:35,977 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 43 transitions. [2019-11-06 18:43:35,978 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 43 transitions. Word has length 36 [2019-11-06 18:43:35,978 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:35,978 INFO L462 AbstractCegarLoop]: Abstraction has 42 states and 43 transitions. [2019-11-06 18:43:35,978 INFO L463 AbstractCegarLoop]: Interpolant automaton has 28 states. [2019-11-06 18:43:35,978 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 43 transitions. [2019-11-06 18:43:35,979 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2019-11-06 18:43:35,979 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:35,979 INFO L410 BasicCegarLoop]: trace histogram [24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:36,184 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:36,184 INFO L410 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:36,185 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:36,185 INFO L82 PathProgramCache]: Analyzing trace with hash -1734509134, now seen corresponding path program 24 times [2019-11-06 18:43:36,185 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:36,185 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1644752312] [2019-11-06 18:43:36,185 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:36,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:36,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:36,500 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:43:36,501 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1644752312] [2019-11-06 18:43:36,501 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1071105010] [2019-11-06 18:43:36,501 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:36,903 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2019-11-06 18:43:36,903 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:43:36,905 INFO L256 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 26 conjunts are in the unsatisfiable core [2019-11-06 18:43:36,906 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:43:36,925 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:43:36,925 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:43:36,925 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 27] total 29 [2019-11-06 18:43:36,925 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [541763831] [2019-11-06 18:43:36,926 INFO L442 AbstractCegarLoop]: Interpolant automaton has 29 states [2019-11-06 18:43:36,926 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:36,926 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2019-11-06 18:43:36,927 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=380, Invalid=432, Unknown=0, NotChecked=0, Total=812 [2019-11-06 18:43:36,927 INFO L87 Difference]: Start difference. First operand 42 states and 43 transitions. Second operand 29 states. [2019-11-06 18:43:37,056 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:37,057 INFO L93 Difference]: Finished difference Result 54 states and 56 transitions. [2019-11-06 18:43:37,057 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2019-11-06 18:43:37,057 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 37 [2019-11-06 18:43:37,057 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:37,058 INFO L225 Difference]: With dead ends: 54 [2019-11-06 18:43:37,058 INFO L226 Difference]: Without dead ends: 43 [2019-11-06 18:43:37,059 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=380, Invalid=432, Unknown=0, NotChecked=0, Total=812 [2019-11-06 18:43:37,059 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2019-11-06 18:43:37,061 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2019-11-06 18:43:37,061 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2019-11-06 18:43:37,062 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 44 transitions. [2019-11-06 18:43:37,062 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 44 transitions. Word has length 37 [2019-11-06 18:43:37,062 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:37,062 INFO L462 AbstractCegarLoop]: Abstraction has 43 states and 44 transitions. [2019-11-06 18:43:37,062 INFO L463 AbstractCegarLoop]: Interpolant automaton has 29 states. [2019-11-06 18:43:37,063 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 44 transitions. [2019-11-06 18:43:37,063 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2019-11-06 18:43:37,063 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:37,063 INFO L410 BasicCegarLoop]: trace histogram [25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:37,284 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:37,284 INFO L410 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:37,285 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:37,285 INFO L82 PathProgramCache]: Analyzing trace with hash -26286994, now seen corresponding path program 25 times [2019-11-06 18:43:37,285 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:37,285 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [558343985] [2019-11-06 18:43:37,286 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:37,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:37,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:37,620 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:43:37,620 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [558343985] [2019-11-06 18:43:37,620 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [606071143] [2019-11-06 18:43:37,620 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:37,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:37,679 INFO L256 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 27 conjunts are in the unsatisfiable core [2019-11-06 18:43:37,680 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:43:37,691 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:43:37,691 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:43:37,691 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28] total 30 [2019-11-06 18:43:37,691 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [688806397] [2019-11-06 18:43:37,691 INFO L442 AbstractCegarLoop]: Interpolant automaton has 30 states [2019-11-06 18:43:37,692 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:37,692 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2019-11-06 18:43:37,692 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=408, Invalid=462, Unknown=0, NotChecked=0, Total=870 [2019-11-06 18:43:37,692 INFO L87 Difference]: Start difference. First operand 43 states and 44 transitions. Second operand 30 states. [2019-11-06 18:43:37,852 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:37,852 INFO L93 Difference]: Finished difference Result 55 states and 57 transitions. [2019-11-06 18:43:37,852 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2019-11-06 18:43:37,853 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 38 [2019-11-06 18:43:37,853 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:37,853 INFO L225 Difference]: With dead ends: 55 [2019-11-06 18:43:37,853 INFO L226 Difference]: Without dead ends: 44 [2019-11-06 18:43:37,854 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 73 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=408, Invalid=462, Unknown=0, NotChecked=0, Total=870 [2019-11-06 18:43:37,854 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2019-11-06 18:43:37,858 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2019-11-06 18:43:37,859 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2019-11-06 18:43:37,859 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 45 transitions. [2019-11-06 18:43:37,859 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 45 transitions. Word has length 38 [2019-11-06 18:43:37,859 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:37,859 INFO L462 AbstractCegarLoop]: Abstraction has 44 states and 45 transitions. [2019-11-06 18:43:37,860 INFO L463 AbstractCegarLoop]: Interpolant automaton has 30 states. [2019-11-06 18:43:37,860 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 45 transitions. [2019-11-06 18:43:37,860 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2019-11-06 18:43:37,860 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:37,860 INFO L410 BasicCegarLoop]: trace histogram [26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:38,064 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:38,064 INFO L410 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:38,064 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:38,065 INFO L82 PathProgramCache]: Analyzing trace with hash 1388991794, now seen corresponding path program 26 times [2019-11-06 18:43:38,065 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:38,065 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [737878668] [2019-11-06 18:43:38,065 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:38,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:38,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:38,471 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:43:38,471 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [737878668] [2019-11-06 18:43:38,472 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [252522214] [2019-11-06 18:43:38,472 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:38,532 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 18:43:38,532 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:43:38,533 INFO L256 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 28 conjunts are in the unsatisfiable core [2019-11-06 18:43:38,534 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:43:38,551 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:43:38,551 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:43:38,552 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 29] total 31 [2019-11-06 18:43:38,552 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1224701123] [2019-11-06 18:43:38,552 INFO L442 AbstractCegarLoop]: Interpolant automaton has 31 states [2019-11-06 18:43:38,552 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:38,553 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2019-11-06 18:43:38,553 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=437, Invalid=493, Unknown=0, NotChecked=0, Total=930 [2019-11-06 18:43:38,553 INFO L87 Difference]: Start difference. First operand 44 states and 45 transitions. Second operand 31 states. [2019-11-06 18:43:38,720 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:38,720 INFO L93 Difference]: Finished difference Result 56 states and 58 transitions. [2019-11-06 18:43:38,721 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2019-11-06 18:43:38,721 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 39 [2019-11-06 18:43:38,721 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:38,721 INFO L225 Difference]: With dead ends: 56 [2019-11-06 18:43:38,721 INFO L226 Difference]: Without dead ends: 45 [2019-11-06 18:43:38,722 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=437, Invalid=493, Unknown=0, NotChecked=0, Total=930 [2019-11-06 18:43:38,722 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2019-11-06 18:43:38,724 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2019-11-06 18:43:38,724 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2019-11-06 18:43:38,724 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 46 transitions. [2019-11-06 18:43:38,724 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 46 transitions. Word has length 39 [2019-11-06 18:43:38,724 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:38,724 INFO L462 AbstractCegarLoop]: Abstraction has 45 states and 46 transitions. [2019-11-06 18:43:38,724 INFO L463 AbstractCegarLoop]: Interpolant automaton has 31 states. [2019-11-06 18:43:38,725 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 46 transitions. [2019-11-06 18:43:38,725 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2019-11-06 18:43:38,725 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:38,725 INFO L410 BasicCegarLoop]: trace histogram [27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:38,925 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:38,926 INFO L410 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:38,926 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:38,926 INFO L82 PathProgramCache]: Analyzing trace with hash -1982006034, now seen corresponding path program 27 times [2019-11-06 18:43:38,927 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:38,927 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1148168163] [2019-11-06 18:43:38,927 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:38,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:39,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:39,451 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:43:39,452 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1148168163] [2019-11-06 18:43:39,452 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1094863509] [2019-11-06 18:43:39,452 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:41,462 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2019-11-06 18:43:41,463 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:43:41,467 INFO L256 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 29 conjunts are in the unsatisfiable core [2019-11-06 18:43:41,468 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:43:41,485 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:43:41,485 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:43:41,485 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 30] total 32 [2019-11-06 18:43:41,486 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [99908928] [2019-11-06 18:43:41,486 INFO L442 AbstractCegarLoop]: Interpolant automaton has 32 states [2019-11-06 18:43:41,486 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:41,486 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2019-11-06 18:43:41,487 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=467, Invalid=525, Unknown=0, NotChecked=0, Total=992 [2019-11-06 18:43:41,487 INFO L87 Difference]: Start difference. First operand 45 states and 46 transitions. Second operand 32 states. [2019-11-06 18:43:41,671 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:41,671 INFO L93 Difference]: Finished difference Result 57 states and 59 transitions. [2019-11-06 18:43:41,672 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2019-11-06 18:43:41,672 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 40 [2019-11-06 18:43:41,672 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:41,672 INFO L225 Difference]: With dead ends: 57 [2019-11-06 18:43:41,672 INFO L226 Difference]: Without dead ends: 46 [2019-11-06 18:43:41,673 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 79 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=467, Invalid=525, Unknown=0, NotChecked=0, Total=992 [2019-11-06 18:43:41,673 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2019-11-06 18:43:41,675 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2019-11-06 18:43:41,675 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2019-11-06 18:43:41,676 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 47 transitions. [2019-11-06 18:43:41,676 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 47 transitions. Word has length 40 [2019-11-06 18:43:41,676 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:41,676 INFO L462 AbstractCegarLoop]: Abstraction has 46 states and 47 transitions. [2019-11-06 18:43:41,676 INFO L463 AbstractCegarLoop]: Interpolant automaton has 32 states. [2019-11-06 18:43:41,677 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 47 transitions. [2019-11-06 18:43:41,677 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2019-11-06 18:43:41,677 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:41,677 INFO L410 BasicCegarLoop]: trace histogram [28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:41,878 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:41,878 INFO L410 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:41,879 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:41,879 INFO L82 PathProgramCache]: Analyzing trace with hash 891243698, now seen corresponding path program 28 times [2019-11-06 18:43:41,879 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:41,880 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [418861496] [2019-11-06 18:43:41,880 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:41,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:42,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:42,257 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:43:42,258 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [418861496] [2019-11-06 18:43:42,258 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2125473616] [2019-11-06 18:43:42,258 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:42,321 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-06 18:43:42,321 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:43:42,322 INFO L256 TraceCheckSpWp]: Trace formula consists of 164 conjuncts, 30 conjunts are in the unsatisfiable core [2019-11-06 18:43:42,323 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:43:42,335 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:43:42,335 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:43:42,335 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 31] total 33 [2019-11-06 18:43:42,336 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [669376695] [2019-11-06 18:43:42,336 INFO L442 AbstractCegarLoop]: Interpolant automaton has 33 states [2019-11-06 18:43:42,336 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:42,336 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2019-11-06 18:43:42,337 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=498, Invalid=558, Unknown=0, NotChecked=0, Total=1056 [2019-11-06 18:43:42,337 INFO L87 Difference]: Start difference. First operand 46 states and 47 transitions. Second operand 33 states. [2019-11-06 18:43:42,480 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:42,481 INFO L93 Difference]: Finished difference Result 58 states and 60 transitions. [2019-11-06 18:43:42,481 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2019-11-06 18:43:42,481 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 41 [2019-11-06 18:43:42,481 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:42,482 INFO L225 Difference]: With dead ends: 58 [2019-11-06 18:43:42,482 INFO L226 Difference]: Without dead ends: 47 [2019-11-06 18:43:42,483 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 82 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=498, Invalid=558, Unknown=0, NotChecked=0, Total=1056 [2019-11-06 18:43:42,483 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2019-11-06 18:43:42,485 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2019-11-06 18:43:42,486 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2019-11-06 18:43:42,486 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 48 transitions. [2019-11-06 18:43:42,486 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 48 transitions. Word has length 41 [2019-11-06 18:43:42,486 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:42,486 INFO L462 AbstractCegarLoop]: Abstraction has 47 states and 48 transitions. [2019-11-06 18:43:42,486 INFO L463 AbstractCegarLoop]: Interpolant automaton has 33 states. [2019-11-06 18:43:42,486 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 48 transitions. [2019-11-06 18:43:42,487 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2019-11-06 18:43:42,487 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:42,487 INFO L410 BasicCegarLoop]: trace histogram [29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:42,687 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:42,688 INFO L410 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:42,688 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:42,688 INFO L82 PathProgramCache]: Analyzing trace with hash -232327826, now seen corresponding path program 29 times [2019-11-06 18:43:42,688 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:42,689 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [64891514] [2019-11-06 18:43:42,689 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:42,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:43,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:43,133 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:43:43,133 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [64891514] [2019-11-06 18:43:43,133 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [603353282] [2019-11-06 18:43:43,134 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:43,942 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 16 check-sat command(s) [2019-11-06 18:43:43,943 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:43:43,946 INFO L256 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 31 conjunts are in the unsatisfiable core [2019-11-06 18:43:43,947 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:43:43,959 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:43:43,959 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:43:43,960 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 32] total 34 [2019-11-06 18:43:43,960 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1750615915] [2019-11-06 18:43:43,960 INFO L442 AbstractCegarLoop]: Interpolant automaton has 34 states [2019-11-06 18:43:43,960 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:43,960 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2019-11-06 18:43:43,961 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=530, Invalid=592, Unknown=0, NotChecked=0, Total=1122 [2019-11-06 18:43:43,961 INFO L87 Difference]: Start difference. First operand 47 states and 48 transitions. Second operand 34 states. [2019-11-06 18:43:44,037 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:44,037 INFO L93 Difference]: Finished difference Result 59 states and 61 transitions. [2019-11-06 18:43:44,038 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2019-11-06 18:43:44,038 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 42 [2019-11-06 18:43:44,038 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:44,038 INFO L225 Difference]: With dead ends: 59 [2019-11-06 18:43:44,039 INFO L226 Difference]: Without dead ends: 48 [2019-11-06 18:43:44,039 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=530, Invalid=592, Unknown=0, NotChecked=0, Total=1122 [2019-11-06 18:43:44,039 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2019-11-06 18:43:44,041 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2019-11-06 18:43:44,042 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2019-11-06 18:43:44,042 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 49 transitions. [2019-11-06 18:43:44,042 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 49 transitions. Word has length 42 [2019-11-06 18:43:44,042 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:44,042 INFO L462 AbstractCegarLoop]: Abstraction has 48 states and 49 transitions. [2019-11-06 18:43:44,043 INFO L463 AbstractCegarLoop]: Interpolant automaton has 34 states. [2019-11-06 18:43:44,043 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 49 transitions. [2019-11-06 18:43:44,043 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2019-11-06 18:43:44,043 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:44,043 INFO L410 BasicCegarLoop]: trace histogram [30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:44,245 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:44,245 INFO L410 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:44,246 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:44,246 INFO L82 PathProgramCache]: Analyzing trace with hash -703306702, now seen corresponding path program 30 times [2019-11-06 18:43:44,246 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:44,247 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [171516259] [2019-11-06 18:43:44,247 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:44,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:44,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:44,657 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:43:44,657 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [171516259] [2019-11-06 18:43:44,658 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [859664474] [2019-11-06 18:43:44,658 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:47,062 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 16 check-sat command(s) [2019-11-06 18:43:47,062 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:43:47,068 INFO L256 TraceCheckSpWp]: Trace formula consists of 172 conjuncts, 32 conjunts are in the unsatisfiable core [2019-11-06 18:43:47,069 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:43:47,084 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:43:47,085 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:43:47,085 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 33] total 35 [2019-11-06 18:43:47,085 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [623569054] [2019-11-06 18:43:47,086 INFO L442 AbstractCegarLoop]: Interpolant automaton has 35 states [2019-11-06 18:43:47,086 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:47,087 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2019-11-06 18:43:47,088 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=563, Invalid=627, Unknown=0, NotChecked=0, Total=1190 [2019-11-06 18:43:47,088 INFO L87 Difference]: Start difference. First operand 48 states and 49 transitions. Second operand 35 states. [2019-11-06 18:43:47,269 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:47,270 INFO L93 Difference]: Finished difference Result 60 states and 62 transitions. [2019-11-06 18:43:47,270 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2019-11-06 18:43:47,270 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 43 [2019-11-06 18:43:47,271 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:47,271 INFO L225 Difference]: With dead ends: 60 [2019-11-06 18:43:47,271 INFO L226 Difference]: Without dead ends: 49 [2019-11-06 18:43:47,272 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=563, Invalid=627, Unknown=0, NotChecked=0, Total=1190 [2019-11-06 18:43:47,273 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2019-11-06 18:43:47,275 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2019-11-06 18:43:47,275 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2019-11-06 18:43:47,275 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 50 transitions. [2019-11-06 18:43:47,275 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 50 transitions. Word has length 43 [2019-11-06 18:43:47,276 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:47,276 INFO L462 AbstractCegarLoop]: Abstraction has 49 states and 50 transitions. [2019-11-06 18:43:47,276 INFO L463 AbstractCegarLoop]: Interpolant automaton has 35 states. [2019-11-06 18:43:47,276 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 50 transitions. [2019-11-06 18:43:47,276 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2019-11-06 18:43:47,276 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:47,277 INFO L410 BasicCegarLoop]: trace histogram [31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:47,482 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:47,483 INFO L410 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:47,483 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:47,483 INFO L82 PathProgramCache]: Analyzing trace with hash 1876217326, now seen corresponding path program 31 times [2019-11-06 18:43:47,484 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:47,484 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1185685223] [2019-11-06 18:43:47,484 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:47,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:48,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:48,160 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:43:48,160 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1185685223] [2019-11-06 18:43:48,161 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1708817068] [2019-11-06 18:43:48,161 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:48,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:48,276 INFO L256 TraceCheckSpWp]: Trace formula consists of 176 conjuncts, 33 conjunts are in the unsatisfiable core [2019-11-06 18:43:48,278 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:43:48,308 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:43:48,309 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:43:48,309 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 34] total 36 [2019-11-06 18:43:48,310 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1451440505] [2019-11-06 18:43:48,311 INFO L442 AbstractCegarLoop]: Interpolant automaton has 36 states [2019-11-06 18:43:48,311 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:48,312 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2019-11-06 18:43:48,312 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=597, Invalid=663, Unknown=0, NotChecked=0, Total=1260 [2019-11-06 18:43:48,313 INFO L87 Difference]: Start difference. First operand 49 states and 50 transitions. Second operand 36 states. [2019-11-06 18:43:48,394 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:48,394 INFO L93 Difference]: Finished difference Result 61 states and 63 transitions. [2019-11-06 18:43:48,395 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2019-11-06 18:43:48,395 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 44 [2019-11-06 18:43:48,395 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:48,396 INFO L225 Difference]: With dead ends: 61 [2019-11-06 18:43:48,396 INFO L226 Difference]: Without dead ends: 50 [2019-11-06 18:43:48,397 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=597, Invalid=663, Unknown=0, NotChecked=0, Total=1260 [2019-11-06 18:43:48,399 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2019-11-06 18:43:48,402 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2019-11-06 18:43:48,402 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2019-11-06 18:43:48,402 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 51 transitions. [2019-11-06 18:43:48,403 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 51 transitions. Word has length 44 [2019-11-06 18:43:48,403 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:48,403 INFO L462 AbstractCegarLoop]: Abstraction has 50 states and 51 transitions. [2019-11-06 18:43:48,403 INFO L463 AbstractCegarLoop]: Interpolant automaton has 36 states. [2019-11-06 18:43:48,404 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 51 transitions. [2019-11-06 18:43:48,404 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2019-11-06 18:43:48,404 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:48,405 INFO L410 BasicCegarLoop]: trace histogram [32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:48,608 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:48,608 INFO L410 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:48,609 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:48,609 INFO L82 PathProgramCache]: Analyzing trace with hash 237083570, now seen corresponding path program 32 times [2019-11-06 18:43:48,609 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:48,609 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1597102063] [2019-11-06 18:43:48,609 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:48,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:49,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:49,095 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:43:49,095 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1597102063] [2019-11-06 18:43:49,095 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [493303865] [2019-11-06 18:43:49,095 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:49,166 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 18:43:49,166 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:43:49,168 INFO L256 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 34 conjunts are in the unsatisfiable core [2019-11-06 18:43:49,169 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:43:49,184 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:43:49,184 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:43:49,185 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 35] total 37 [2019-11-06 18:43:49,185 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [110345630] [2019-11-06 18:43:49,185 INFO L442 AbstractCegarLoop]: Interpolant automaton has 37 states [2019-11-06 18:43:49,185 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:49,186 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2019-11-06 18:43:49,186 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=632, Invalid=700, Unknown=0, NotChecked=0, Total=1332 [2019-11-06 18:43:49,186 INFO L87 Difference]: Start difference. First operand 50 states and 51 transitions. Second operand 37 states. [2019-11-06 18:43:49,352 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:49,352 INFO L93 Difference]: Finished difference Result 62 states and 64 transitions. [2019-11-06 18:43:49,352 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2019-11-06 18:43:49,353 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 45 [2019-11-06 18:43:49,353 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:49,353 INFO L225 Difference]: With dead ends: 62 [2019-11-06 18:43:49,354 INFO L226 Difference]: Without dead ends: 51 [2019-11-06 18:43:49,355 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 94 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=632, Invalid=700, Unknown=0, NotChecked=0, Total=1332 [2019-11-06 18:43:49,355 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2019-11-06 18:43:49,357 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2019-11-06 18:43:49,357 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2019-11-06 18:43:49,358 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 52 transitions. [2019-11-06 18:43:49,358 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 52 transitions. Word has length 45 [2019-11-06 18:43:49,358 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:49,358 INFO L462 AbstractCegarLoop]: Abstraction has 51 states and 52 transitions. [2019-11-06 18:43:49,358 INFO L463 AbstractCegarLoop]: Interpolant automaton has 37 states. [2019-11-06 18:43:49,359 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 52 transitions. [2019-11-06 18:43:49,359 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2019-11-06 18:43:49,359 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:49,359 INFO L410 BasicCegarLoop]: trace histogram [33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:49,563 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:49,563 INFO L410 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:49,563 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:49,564 INFO L82 PathProgramCache]: Analyzing trace with hash 963544686, now seen corresponding path program 33 times [2019-11-06 18:43:49,564 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:49,564 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [976833088] [2019-11-06 18:43:49,565 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:49,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:50,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:50,147 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:43:50,147 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [976833088] [2019-11-06 18:43:50,147 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1062541825] [2019-11-06 18:43:50,148 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:58,399 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2019-11-06 18:43:58,400 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:43:58,409 INFO L256 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 35 conjunts are in the unsatisfiable core [2019-11-06 18:43:58,410 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:43:58,423 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:43:58,423 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:43:58,423 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 36] total 38 [2019-11-06 18:43:58,423 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1019449760] [2019-11-06 18:43:58,424 INFO L442 AbstractCegarLoop]: Interpolant automaton has 38 states [2019-11-06 18:43:58,424 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:58,424 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2019-11-06 18:43:58,425 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=668, Invalid=738, Unknown=0, NotChecked=0, Total=1406 [2019-11-06 18:43:58,425 INFO L87 Difference]: Start difference. First operand 51 states and 52 transitions. Second operand 38 states. [2019-11-06 18:43:58,596 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:58,596 INFO L93 Difference]: Finished difference Result 63 states and 65 transitions. [2019-11-06 18:43:58,596 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2019-11-06 18:43:58,596 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 46 [2019-11-06 18:43:58,597 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:58,597 INFO L225 Difference]: With dead ends: 63 [2019-11-06 18:43:58,597 INFO L226 Difference]: Without dead ends: 52 [2019-11-06 18:43:58,598 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=668, Invalid=738, Unknown=0, NotChecked=0, Total=1406 [2019-11-06 18:43:58,598 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2019-11-06 18:43:58,601 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2019-11-06 18:43:58,601 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2019-11-06 18:43:58,602 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 53 transitions. [2019-11-06 18:43:58,602 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 53 transitions. Word has length 46 [2019-11-06 18:43:58,603 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:58,603 INFO L462 AbstractCegarLoop]: Abstraction has 52 states and 53 transitions. [2019-11-06 18:43:58,603 INFO L463 AbstractCegarLoop]: Interpolant automaton has 38 states. [2019-11-06 18:43:58,603 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 53 transitions. [2019-11-06 18:43:58,603 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2019-11-06 18:43:58,603 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:58,603 INFO L410 BasicCegarLoop]: trace histogram [34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:58,805 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:58,805 INFO L410 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:58,806 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:58,806 INFO L82 PathProgramCache]: Analyzing trace with hash 2009002802, now seen corresponding path program 34 times [2019-11-06 18:43:58,806 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:58,807 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1227956163] [2019-11-06 18:43:58,807 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:58,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:59,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:59,341 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:43:59,341 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1227956163] [2019-11-06 18:43:59,341 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1973779834] [2019-11-06 18:43:59,341 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:59,417 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-06 18:43:59,417 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:43:59,418 INFO L256 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 36 conjunts are in the unsatisfiable core [2019-11-06 18:43:59,419 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:43:59,454 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:43:59,454 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:43:59,454 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 37] total 39 [2019-11-06 18:43:59,454 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1231729203] [2019-11-06 18:43:59,455 INFO L442 AbstractCegarLoop]: Interpolant automaton has 39 states [2019-11-06 18:43:59,455 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:59,455 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2019-11-06 18:43:59,456 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=705, Invalid=777, Unknown=0, NotChecked=0, Total=1482 [2019-11-06 18:43:59,456 INFO L87 Difference]: Start difference. First operand 52 states and 53 transitions. Second operand 39 states. [2019-11-06 18:43:59,604 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:59,605 INFO L93 Difference]: Finished difference Result 64 states and 66 transitions. [2019-11-06 18:43:59,605 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2019-11-06 18:43:59,605 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 47 [2019-11-06 18:43:59,606 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:59,606 INFO L225 Difference]: With dead ends: 64 [2019-11-06 18:43:59,606 INFO L226 Difference]: Without dead ends: 53 [2019-11-06 18:43:59,607 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 100 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=705, Invalid=777, Unknown=0, NotChecked=0, Total=1482 [2019-11-06 18:43:59,608 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2019-11-06 18:43:59,610 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2019-11-06 18:43:59,610 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2019-11-06 18:43:59,610 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 54 transitions. [2019-11-06 18:43:59,611 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 54 transitions. Word has length 47 [2019-11-06 18:43:59,611 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:59,611 INFO L462 AbstractCegarLoop]: Abstraction has 53 states and 54 transitions. [2019-11-06 18:43:59,611 INFO L463 AbstractCegarLoop]: Interpolant automaton has 39 states. [2019-11-06 18:43:59,611 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 54 transitions. [2019-11-06 18:43:59,612 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2019-11-06 18:43:59,612 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:59,612 INFO L410 BasicCegarLoop]: trace histogram [35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:59,815 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:59,815 INFO L410 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:59,815 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:59,816 INFO L82 PathProgramCache]: Analyzing trace with hash 58466030, now seen corresponding path program 35 times [2019-11-06 18:43:59,816 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:59,816 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [698656805] [2019-11-06 18:43:59,817 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:59,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:44:00,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:44:00,598 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:44:00,598 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [698656805] [2019-11-06 18:44:00,599 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [635211309] [2019-11-06 18:44:00,599 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:44:01,268 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 19 check-sat command(s) [2019-11-06 18:44:01,268 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:44:01,271 INFO L256 TraceCheckSpWp]: Trace formula consists of 192 conjuncts, 37 conjunts are in the unsatisfiable core [2019-11-06 18:44:01,272 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:44:01,299 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:44:01,299 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:44:01,299 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 38] total 40 [2019-11-06 18:44:01,299 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1804189460] [2019-11-06 18:44:01,300 INFO L442 AbstractCegarLoop]: Interpolant automaton has 40 states [2019-11-06 18:44:01,300 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:44:01,300 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2019-11-06 18:44:01,301 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=743, Invalid=817, Unknown=0, NotChecked=0, Total=1560 [2019-11-06 18:44:01,301 INFO L87 Difference]: Start difference. First operand 53 states and 54 transitions. Second operand 40 states. [2019-11-06 18:44:01,493 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:44:01,493 INFO L93 Difference]: Finished difference Result 65 states and 67 transitions. [2019-11-06 18:44:01,493 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2019-11-06 18:44:01,493 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 48 [2019-11-06 18:44:01,493 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:44:01,494 INFO L225 Difference]: With dead ends: 65 [2019-11-06 18:44:01,494 INFO L226 Difference]: Without dead ends: 54 [2019-11-06 18:44:01,495 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 103 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=743, Invalid=817, Unknown=0, NotChecked=0, Total=1560 [2019-11-06 18:44:01,495 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2019-11-06 18:44:01,498 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2019-11-06 18:44:01,498 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2019-11-06 18:44:01,498 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 55 transitions. [2019-11-06 18:44:01,499 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 55 transitions. Word has length 48 [2019-11-06 18:44:01,499 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:44:01,499 INFO L462 AbstractCegarLoop]: Abstraction has 54 states and 55 transitions. [2019-11-06 18:44:01,499 INFO L463 AbstractCegarLoop]: Interpolant automaton has 40 states. [2019-11-06 18:44:01,499 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 55 transitions. [2019-11-06 18:44:01,499 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2019-11-06 18:44:01,500 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:44:01,500 INFO L410 BasicCegarLoop]: trace histogram [36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:44:01,704 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:44:01,705 INFO L410 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:44:01,705 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:44:01,706 INFO L82 PathProgramCache]: Analyzing trace with hash -278631758, now seen corresponding path program 36 times [2019-11-06 18:44:01,706 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:44:01,706 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1714037437] [2019-11-06 18:44:01,707 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:44:01,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:44:02,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:44:02,362 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:44:02,362 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1714037437] [2019-11-06 18:44:02,362 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [575325661] [2019-11-06 18:44:02,363 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true