/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/loop-acceleration/array_4.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-fb55353 [2019-11-06 21:20:19,022 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-06 21:20:19,026 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-06 21:20:19,046 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-11-06 21:20:19,046 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-11-06 21:20:19,048 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-11-06 21:20:19,050 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-11-06 21:20:19,060 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-11-06 21:20:19,065 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-11-06 21:20:19,068 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-11-06 21:20:19,070 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-11-06 21:20:19,072 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-11-06 21:20:19,072 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-06 21:20:19,074 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-06 21:20:19,076 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-06 21:20:19,077 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-06 21:20:19,079 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-06 21:20:19,080 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-06 21:20:19,082 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-06 21:20:19,087 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-06 21:20:19,091 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-06 21:20:19,094 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-06 21:20:19,097 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-06 21:20:19,098 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-06 21:20:19,100 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-11-06 21:20:19,111 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-06 21:20:19,112 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-06 21:20:19,113 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-06 21:20:19,114 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 21:20:19,141 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-06 21:20:19,141 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-06 21:20:19,145 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-06 21:20:19,145 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-06 21:20:19,145 INFO L138 SettingsManager]: * Use SBE=true [2019-11-06 21:20:19,146 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-06 21:20:19,146 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-06 21:20:19,146 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-06 21:20:19,146 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-06 21:20:19,146 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-06 21:20:19,147 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-06 21:20:19,148 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-06 21:20:19,148 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-06 21:20:19,148 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-06 21:20:19,149 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-06 21:20:19,149 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-06 21:20:19,149 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-06 21:20:19,149 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-06 21:20:19,149 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-06 21:20:19,149 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-06 21:20:19,150 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-06 21:20:19,150 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-06 21:20:19,150 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-06 21:20:19,151 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-06 21:20:19,151 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-06 21:20:19,151 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-06 21:20:19,151 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-06 21:20:19,151 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-06 21:20:19,151 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-11-06 21:20:19,437 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-06 21:20:19,450 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-06 21:20:19,453 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-06 21:20:19,455 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-06 21:20:19,455 INFO L275 PluginConnector]: CDTParser initialized [2019-11-06 21:20:19,456 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/array_4.i [2019-11-06 21:20:19,534 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f2c108161/e9a18e512c184f5db6da5827d7011cb1/FLAGfde842e75 [2019-11-06 21:20:19,995 INFO L306 CDTParser]: Found 1 translation units. [2019-11-06 21:20:19,996 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/array_4.i [2019-11-06 21:20:20,002 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f2c108161/e9a18e512c184f5db6da5827d7011cb1/FLAGfde842e75 [2019-11-06 21:20:20,438 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f2c108161/e9a18e512c184f5db6da5827d7011cb1 [2019-11-06 21:20:20,450 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-06 21:20:20,451 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-11-06 21:20:20,456 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-06 21:20:20,457 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-06 21:20:20,461 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-06 21:20:20,462 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 09:20:20" (1/1) ... [2019-11-06 21:20:20,465 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6aae0012 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:20:20, skipping insertion in model container [2019-11-06 21:20:20,465 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 09:20:20" (1/1) ... [2019-11-06 21:20:20,474 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-11-06 21:20:20,493 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-11-06 21:20:20,664 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-06 21:20:20,668 INFO L188 MainTranslator]: Completed pre-run [2019-11-06 21:20:20,689 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-06 21:20:20,710 INFO L192 MainTranslator]: Completed translation [2019-11-06 21:20:20,711 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:20:20 WrapperNode [2019-11-06 21:20:20,711 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-06 21:20:20,712 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-06 21:20:20,712 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-06 21:20:20,712 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-06 21:20:20,814 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:20:20" (1/1) ... [2019-11-06 21:20:20,814 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:20:20" (1/1) ... [2019-11-06 21:20:20,822 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:20:20" (1/1) ... [2019-11-06 21:20:20,823 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:20:20" (1/1) ... [2019-11-06 21:20:20,829 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:20:20" (1/1) ... [2019-11-06 21:20:20,834 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:20:20" (1/1) ... [2019-11-06 21:20:20,836 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:20:20" (1/1) ... [2019-11-06 21:20:20,838 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-06 21:20:20,838 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-06 21:20:20,838 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-06 21:20:20,839 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-06 21:20:20,845 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:20:20" (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 21:20:20,904 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-11-06 21:20:20,904 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-06 21:20:20,904 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-11-06 21:20:20,905 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-11-06 21:20:20,905 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-11-06 21:20:20,905 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-11-06 21:20:20,905 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-11-06 21:20:20,905 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-11-06 21:20:20,905 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-11-06 21:20:20,905 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-11-06 21:20:20,906 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-11-06 21:20:20,906 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-11-06 21:20:20,906 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-11-06 21:20:20,906 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-06 21:20:21,123 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-06 21:20:21,123 INFO L284 CfgBuilder]: Removed 2 assume(true) statements. [2019-11-06 21:20:21,125 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 09:20:21 BoogieIcfgContainer [2019-11-06 21:20:21,125 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-06 21:20:21,126 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-06 21:20:21,126 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-06 21:20:21,129 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-06 21:20:21,130 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.11 09:20:20" (1/3) ... [2019-11-06 21:20:21,131 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@325a30d9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 09:20:21, skipping insertion in model container [2019-11-06 21:20:21,131 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:20:20" (2/3) ... [2019-11-06 21:20:21,132 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@325a30d9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 09:20:21, skipping insertion in model container [2019-11-06 21:20:21,132 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 09:20:21" (3/3) ... [2019-11-06 21:20:21,134 INFO L109 eAbstractionObserver]: Analyzing ICFG array_4.i [2019-11-06 21:20:21,144 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-06 21:20:21,152 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-06 21:20:21,165 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-06 21:20:21,196 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-06 21:20:21,196 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-06 21:20:21,196 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-06 21:20:21,197 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-06 21:20:21,197 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-06 21:20:21,197 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-06 21:20:21,197 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-06 21:20:21,197 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-06 21:20:21,223 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states. [2019-11-06 21:20:21,231 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2019-11-06 21:20:21,232 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:21,233 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:21,235 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:21,242 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:21,243 INFO L82 PathProgramCache]: Analyzing trace with hash -1816719235, now seen corresponding path program 1 times [2019-11-06 21:20:21,252 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:21,253 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2087294222] [2019-11-06 21:20:21,253 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:21,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:21,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:21,426 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 21:20:21,426 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2087294222] [2019-11-06 21:20:21,427 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 21:20:21,428 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-06 21:20:21,428 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1422052865] [2019-11-06 21:20:21,433 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-06 21:20:21,433 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:21,444 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-06 21:20:21,445 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-06 21:20:21,448 INFO L87 Difference]: Start difference. First operand 24 states. Second operand 3 states. [2019-11-06 21:20:21,543 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:21,543 INFO L93 Difference]: Finished difference Result 40 states and 47 transitions. [2019-11-06 21:20:21,544 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-06 21:20:21,545 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 13 [2019-11-06 21:20:21,546 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:21,556 INFO L225 Difference]: With dead ends: 40 [2019-11-06 21:20:21,557 INFO L226 Difference]: Without dead ends: 17 [2019-11-06 21:20:21,562 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 21:20:21,581 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2019-11-06 21:20:21,595 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2019-11-06 21:20:21,597 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2019-11-06 21:20:21,598 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2019-11-06 21:20:21,599 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 13 [2019-11-06 21:20:21,600 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:21,600 INFO L462 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2019-11-06 21:20:21,600 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-06 21:20:21,600 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2019-11-06 21:20:21,601 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2019-11-06 21:20:21,601 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:21,601 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:21,602 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:21,602 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:21,602 INFO L82 PathProgramCache]: Analyzing trace with hash 1663088498, now seen corresponding path program 1 times [2019-11-06 21:20:21,602 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:21,603 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [755973100] [2019-11-06 21:20:21,603 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:21,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:21,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:21,729 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 21:20:21,729 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [755973100] [2019-11-06 21:20:21,730 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 21:20:21,731 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-11-06 21:20:21,732 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [619442902] [2019-11-06 21:20:21,735 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-06 21:20:21,736 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:21,736 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-06 21:20:21,737 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-11-06 21:20:21,737 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand 4 states. [2019-11-06 21:20:21,809 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:21,810 INFO L93 Difference]: Finished difference Result 32 states and 35 transitions. [2019-11-06 21:20:21,810 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-06 21:20:21,810 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 14 [2019-11-06 21:20:21,811 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:21,814 INFO L225 Difference]: With dead ends: 32 [2019-11-06 21:20:21,814 INFO L226 Difference]: Without dead ends: 23 [2019-11-06 21:20:21,816 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 21:20:21,818 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2019-11-06 21:20:21,832 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 18. [2019-11-06 21:20:21,832 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2019-11-06 21:20:21,833 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2019-11-06 21:20:21,833 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 14 [2019-11-06 21:20:21,834 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:21,834 INFO L462 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2019-11-06 21:20:21,834 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-06 21:20:21,834 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2019-11-06 21:20:21,835 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-11-06 21:20:21,835 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:21,835 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:21,836 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:21,837 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:21,838 INFO L82 PathProgramCache]: Analyzing trace with hash 845539860, now seen corresponding path program 1 times [2019-11-06 21:20:21,838 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:21,838 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1948501935] [2019-11-06 21:20:21,839 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:21,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:22,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:22,007 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-06 21:20:22,010 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1948501935] [2019-11-06 21:20:22,010 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 21:20:22,010 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2019-11-06 21:20:22,011 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1125717338] [2019-11-06 21:20:22,011 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-11-06 21:20:22,012 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:22,012 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-11-06 21:20:22,012 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2019-11-06 21:20:22,012 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 6 states. [2019-11-06 21:20:22,109 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:22,109 INFO L93 Difference]: Finished difference Result 27 states and 28 transitions. [2019-11-06 21:20:22,109 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-11-06 21:20:22,110 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 16 [2019-11-06 21:20:22,110 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:22,111 INFO L225 Difference]: With dead ends: 27 [2019-11-06 21:20:22,111 INFO L226 Difference]: Without dead ends: 22 [2019-11-06 21:20:22,111 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2019-11-06 21:20:22,112 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2019-11-06 21:20:22,115 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 20. [2019-11-06 21:20:22,115 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2019-11-06 21:20:22,116 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2019-11-06 21:20:22,116 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 16 [2019-11-06 21:20:22,117 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:22,117 INFO L462 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2019-11-06 21:20:22,117 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-11-06 21:20:22,117 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2019-11-06 21:20:22,118 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2019-11-06 21:20:22,118 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:22,118 INFO L410 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:22,118 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:22,119 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:22,119 INFO L82 PathProgramCache]: Analyzing trace with hash 221784433, now seen corresponding path program 1 times [2019-11-06 21:20:22,119 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:22,119 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1529013096] [2019-11-06 21:20:22,119 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:22,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:22,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:22,206 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-06 21:20:22,206 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1529013096] [2019-11-06 21:20:22,207 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1202767982] [2019-11-06 21:20:22,207 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 21:20:22,263 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:22,265 INFO L256 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-06 21:20:22,274 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:22,320 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-06 21:20:22,321 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:22,321 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 4] total 8 [2019-11-06 21:20:22,321 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1172867005] [2019-11-06 21:20:22,323 INFO L442 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-11-06 21:20:22,324 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:22,324 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-11-06 21:20:22,326 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2019-11-06 21:20:22,326 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand 8 states. [2019-11-06 21:20:22,454 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:22,455 INFO L93 Difference]: Finished difference Result 41 states and 44 transitions. [2019-11-06 21:20:22,455 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-11-06 21:20:22,455 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 19 [2019-11-06 21:20:22,455 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:22,456 INFO L225 Difference]: With dead ends: 41 [2019-11-06 21:20:22,456 INFO L226 Difference]: Without dead ends: 27 [2019-11-06 21:20:22,457 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2019-11-06 21:20:22,458 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2019-11-06 21:20:22,463 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 25. [2019-11-06 21:20:22,464 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2019-11-06 21:20:22,466 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 26 transitions. [2019-11-06 21:20:22,466 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 26 transitions. Word has length 19 [2019-11-06 21:20:22,466 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:22,467 INFO L462 AbstractCegarLoop]: Abstraction has 25 states and 26 transitions. [2019-11-06 21:20:22,467 INFO L463 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-11-06 21:20:22,467 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 26 transitions. [2019-11-06 21:20:22,468 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2019-11-06 21:20:22,468 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:22,468 INFO L410 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:22,677 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:22,677 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:22,678 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:22,678 INFO L82 PathProgramCache]: Analyzing trace with hash 1899315606, now seen corresponding path program 2 times [2019-11-06 21:20:22,678 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:22,679 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1044510787] [2019-11-06 21:20:22,679 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:22,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:22,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:22,763 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-11-06 21:20:22,763 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1044510787] [2019-11-06 21:20:22,763 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [882648553] [2019-11-06 21:20:22,764 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 21:20:22,825 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 21:20:22,825 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:22,826 INFO L256 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 4 conjunts are in the unsatisfiable core [2019-11-06 21:20:22,828 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:22,852 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2019-11-06 21:20:22,853 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:22,853 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 5] total 9 [2019-11-06 21:20:22,853 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [409729962] [2019-11-06 21:20:22,854 INFO L442 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-11-06 21:20:22,855 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:22,855 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-11-06 21:20:22,856 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2019-11-06 21:20:22,856 INFO L87 Difference]: Start difference. First operand 25 states and 26 transitions. Second operand 9 states. [2019-11-06 21:20:22,981 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:22,981 INFO L93 Difference]: Finished difference Result 49 states and 52 transitions. [2019-11-06 21:20:22,983 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-11-06 21:20:22,983 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 24 [2019-11-06 21:20:22,983 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:22,984 INFO L225 Difference]: With dead ends: 49 [2019-11-06 21:20:22,984 INFO L226 Difference]: Without dead ends: 32 [2019-11-06 21:20:22,985 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=31, Invalid=79, Unknown=0, NotChecked=0, Total=110 [2019-11-06 21:20:22,985 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2019-11-06 21:20:22,990 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2019-11-06 21:20:22,990 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2019-11-06 21:20:22,991 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2019-11-06 21:20:22,991 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 24 [2019-11-06 21:20:22,991 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:22,991 INFO L462 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2019-11-06 21:20:22,991 INFO L463 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-11-06 21:20:22,992 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2019-11-06 21:20:22,992 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2019-11-06 21:20:22,992 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:22,993 INFO L410 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:23,197 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:23,197 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:23,198 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:23,198 INFO L82 PathProgramCache]: Analyzing trace with hash 2019962701, now seen corresponding path program 3 times [2019-11-06 21:20:23,199 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:23,199 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1424331165] [2019-11-06 21:20:23,199 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:23,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:23,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:23,316 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-11-06 21:20:23,317 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1424331165] [2019-11-06 21:20:23,317 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1477446308] [2019-11-06 21:20:23,317 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 21:20:23,384 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2019-11-06 21:20:23,385 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:23,388 INFO L256 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 5 conjunts are in the unsatisfiable core [2019-11-06 21:20:23,391 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:23,411 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2019-11-06 21:20:23,411 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:23,413 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 6] total 10 [2019-11-06 21:20:23,413 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1900964356] [2019-11-06 21:20:23,414 INFO L442 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-11-06 21:20:23,415 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:23,415 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-11-06 21:20:23,416 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2019-11-06 21:20:23,416 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand 10 states. [2019-11-06 21:20:23,555 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:23,556 INFO L93 Difference]: Finished difference Result 57 states and 60 transitions. [2019-11-06 21:20:23,556 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-11-06 21:20:23,556 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 29 [2019-11-06 21:20:23,557 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:23,557 INFO L225 Difference]: With dead ends: 57 [2019-11-06 21:20:23,557 INFO L226 Difference]: Without dead ends: 37 [2019-11-06 21:20:23,558 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=37, Invalid=95, Unknown=0, NotChecked=0, Total=132 [2019-11-06 21:20:23,558 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2019-11-06 21:20:23,568 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2019-11-06 21:20:23,568 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2019-11-06 21:20:23,570 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 36 transitions. [2019-11-06 21:20:23,570 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 36 transitions. Word has length 29 [2019-11-06 21:20:23,571 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:23,571 INFO L462 AbstractCegarLoop]: Abstraction has 35 states and 36 transitions. [2019-11-06 21:20:23,571 INFO L463 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-11-06 21:20:23,571 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 36 transitions. [2019-11-06 21:20:23,575 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2019-11-06 21:20:23,575 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:23,575 INFO L410 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:23,779 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:23,780 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:23,780 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:23,780 INFO L82 PathProgramCache]: Analyzing trace with hash -73516102, now seen corresponding path program 4 times [2019-11-06 21:20:23,780 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:23,781 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [715584000] [2019-11-06 21:20:23,781 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:23,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:23,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:23,947 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2019-11-06 21:20:23,948 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [715584000] [2019-11-06 21:20:23,948 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1633148384] [2019-11-06 21:20:23,948 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 21:20:24,004 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-06 21:20:24,004 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:24,005 INFO L256 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 6 conjunts are in the unsatisfiable core [2019-11-06 21:20:24,009 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:24,032 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2019-11-06 21:20:24,032 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:24,033 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 7] total 11 [2019-11-06 21:20:24,033 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [353714398] [2019-11-06 21:20:24,033 INFO L442 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-11-06 21:20:24,034 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:24,034 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-11-06 21:20:24,035 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2019-11-06 21:20:24,035 INFO L87 Difference]: Start difference. First operand 35 states and 36 transitions. Second operand 11 states. [2019-11-06 21:20:24,173 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:24,174 INFO L93 Difference]: Finished difference Result 65 states and 68 transitions. [2019-11-06 21:20:24,174 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-11-06 21:20:24,174 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 34 [2019-11-06 21:20:24,174 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:24,175 INFO L225 Difference]: With dead ends: 65 [2019-11-06 21:20:24,175 INFO L226 Difference]: Without dead ends: 42 [2019-11-06 21:20:24,177 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2019-11-06 21:20:24,177 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2019-11-06 21:20:24,184 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 40. [2019-11-06 21:20:24,185 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2019-11-06 21:20:24,186 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 41 transitions. [2019-11-06 21:20:24,186 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 41 transitions. Word has length 34 [2019-11-06 21:20:24,187 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:24,187 INFO L462 AbstractCegarLoop]: Abstraction has 40 states and 41 transitions. [2019-11-06 21:20:24,187 INFO L463 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-11-06 21:20:24,187 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 41 transitions. [2019-11-06 21:20:24,190 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2019-11-06 21:20:24,190 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:24,190 INFO L410 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:24,396 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:24,398 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:24,398 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:24,398 INFO L82 PathProgramCache]: Analyzing trace with hash -669211351, now seen corresponding path program 5 times [2019-11-06 21:20:24,399 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:24,399 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [896463244] [2019-11-06 21:20:24,399 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:24,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:24,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:24,526 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2019-11-06 21:20:24,526 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [896463244] [2019-11-06 21:20:24,527 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2089750424] [2019-11-06 21:20:24,527 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 21:20:24,584 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2019-11-06 21:20:24,585 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:24,586 INFO L256 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 7 conjunts are in the unsatisfiable core [2019-11-06 21:20:24,588 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:24,604 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2019-11-06 21:20:24,604 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:24,604 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 8] total 12 [2019-11-06 21:20:24,605 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [750460631] [2019-11-06 21:20:24,605 INFO L442 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-11-06 21:20:24,605 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:24,606 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-11-06 21:20:24,606 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=90, Unknown=0, NotChecked=0, Total=132 [2019-11-06 21:20:24,606 INFO L87 Difference]: Start difference. First operand 40 states and 41 transitions. Second operand 12 states. [2019-11-06 21:20:24,748 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:24,748 INFO L93 Difference]: Finished difference Result 73 states and 76 transitions. [2019-11-06 21:20:24,753 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-11-06 21:20:24,754 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 39 [2019-11-06 21:20:24,754 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:24,754 INFO L225 Difference]: With dead ends: 73 [2019-11-06 21:20:24,755 INFO L226 Difference]: Without dead ends: 47 [2019-11-06 21:20:24,755 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=52, Invalid=130, Unknown=0, NotChecked=0, Total=182 [2019-11-06 21:20:24,756 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2019-11-06 21:20:24,760 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 45. [2019-11-06 21:20:24,760 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2019-11-06 21:20:24,761 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 46 transitions. [2019-11-06 21:20:24,761 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 46 transitions. Word has length 39 [2019-11-06 21:20:24,761 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:24,762 INFO L462 AbstractCegarLoop]: Abstraction has 45 states and 46 transitions. [2019-11-06 21:20:24,762 INFO L463 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-11-06 21:20:24,762 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 46 transitions. [2019-11-06 21:20:24,763 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2019-11-06 21:20:24,763 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:24,763 INFO L410 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:24,966 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:24,967 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:24,967 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:24,967 INFO L82 PathProgramCache]: Analyzing trace with hash -37624354, now seen corresponding path program 6 times [2019-11-06 21:20:24,967 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:24,967 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [805182471] [2019-11-06 21:20:24,968 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:24,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:25,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:25,077 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2019-11-06 21:20:25,077 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [805182471] [2019-11-06 21:20:25,078 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1319975474] [2019-11-06 21:20:25,078 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 21:20:25,155 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2019-11-06 21:20:25,155 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:25,156 INFO L256 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 13 conjunts are in the unsatisfiable core [2019-11-06 21:20:25,161 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:25,182 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-06 21:20:25,205 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2019-11-06 21:20:25,206 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:25,206 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 15 [2019-11-06 21:20:25,206 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [110901416] [2019-11-06 21:20:25,207 INFO L442 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-11-06 21:20:25,207 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:25,207 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-11-06 21:20:25,208 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=153, Unknown=0, NotChecked=0, Total=210 [2019-11-06 21:20:25,208 INFO L87 Difference]: Start difference. First operand 45 states and 46 transitions. Second operand 15 states. [2019-11-06 21:20:25,382 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:25,382 INFO L93 Difference]: Finished difference Result 81 states and 84 transitions. [2019-11-06 21:20:25,382 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-11-06 21:20:25,382 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 44 [2019-11-06 21:20:25,383 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:25,383 INFO L225 Difference]: With dead ends: 81 [2019-11-06 21:20:25,383 INFO L226 Difference]: Without dead ends: 52 [2019-11-06 21:20:25,384 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=70, Invalid=202, Unknown=0, NotChecked=0, Total=272 [2019-11-06 21:20:25,384 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2019-11-06 21:20:25,389 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 50. [2019-11-06 21:20:25,389 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2019-11-06 21:20:25,390 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 51 transitions. [2019-11-06 21:20:25,390 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 51 transitions. Word has length 44 [2019-11-06 21:20:25,390 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:25,390 INFO L462 AbstractCegarLoop]: Abstraction has 50 states and 51 transitions. [2019-11-06 21:20:25,390 INFO L463 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-11-06 21:20:25,390 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 51 transitions. [2019-11-06 21:20:25,391 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2019-11-06 21:20:25,392 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:25,392 INFO L410 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:25,595 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:25,595 INFO L410 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:25,596 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:25,596 INFO L82 PathProgramCache]: Analyzing trace with hash 37047045, now seen corresponding path program 7 times [2019-11-06 21:20:25,597 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:25,597 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2079661049] [2019-11-06 21:20:25,597 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:25,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:25,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:25,754 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2019-11-06 21:20:25,754 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2079661049] [2019-11-06 21:20:25,755 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1325198682] [2019-11-06 21:20:25,755 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 21:20:25,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:25,808 INFO L256 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 9 conjunts are in the unsatisfiable core [2019-11-06 21:20:25,811 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:25,833 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2019-11-06 21:20:25,833 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:25,834 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 10] total 14 [2019-11-06 21:20:25,834 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [406084519] [2019-11-06 21:20:25,834 INFO L442 AbstractCegarLoop]: Interpolant automaton has 14 states [2019-11-06 21:20:25,835 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:25,835 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2019-11-06 21:20:25,835 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2019-11-06 21:20:25,835 INFO L87 Difference]: Start difference. First operand 50 states and 51 transitions. Second operand 14 states. [2019-11-06 21:20:25,961 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:25,961 INFO L93 Difference]: Finished difference Result 89 states and 92 transitions. [2019-11-06 21:20:25,961 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2019-11-06 21:20:25,962 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 49 [2019-11-06 21:20:25,962 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:25,963 INFO L225 Difference]: With dead ends: 89 [2019-11-06 21:20:25,963 INFO L226 Difference]: Without dead ends: 57 [2019-11-06 21:20:25,963 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=71, Invalid=169, Unknown=0, NotChecked=0, Total=240 [2019-11-06 21:20:25,964 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2019-11-06 21:20:25,968 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 55. [2019-11-06 21:20:25,968 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2019-11-06 21:20:25,969 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 56 transitions. [2019-11-06 21:20:25,969 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 56 transitions. Word has length 49 [2019-11-06 21:20:25,970 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:25,970 INFO L462 AbstractCegarLoop]: Abstraction has 55 states and 56 transitions. [2019-11-06 21:20:25,970 INFO L463 AbstractCegarLoop]: Interpolant automaton has 14 states. [2019-11-06 21:20:25,970 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 56 transitions. [2019-11-06 21:20:25,971 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2019-11-06 21:20:25,971 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:25,971 INFO L410 BasicCegarLoop]: trace histogram [9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:26,174 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:26,175 INFO L410 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:26,175 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:26,175 INFO L82 PathProgramCache]: Analyzing trace with hash -1182367742, now seen corresponding path program 8 times [2019-11-06 21:20:26,176 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:26,176 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [703292677] [2019-11-06 21:20:26,176 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:26,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:26,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:26,323 INFO L134 CoverageAnalysis]: Checked inductivity of 164 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2019-11-06 21:20:26,323 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [703292677] [2019-11-06 21:20:26,324 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1125770230] [2019-11-06 21:20:26,324 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 21:20:26,383 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 21:20:26,383 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:26,384 INFO L256 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 10 conjunts are in the unsatisfiable core [2019-11-06 21:20:26,391 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:26,416 INFO L134 CoverageAnalysis]: Checked inductivity of 164 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2019-11-06 21:20:26,417 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:26,417 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 11] total 15 [2019-11-06 21:20:26,417 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2014293579] [2019-11-06 21:20:26,419 INFO L442 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-11-06 21:20:26,420 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:26,420 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-11-06 21:20:26,421 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=138, Unknown=0, NotChecked=0, Total=210 [2019-11-06 21:20:26,421 INFO L87 Difference]: Start difference. First operand 55 states and 56 transitions. Second operand 15 states. [2019-11-06 21:20:26,571 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:26,572 INFO L93 Difference]: Finished difference Result 97 states and 100 transitions. [2019-11-06 21:20:26,572 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-11-06 21:20:26,572 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 54 [2019-11-06 21:20:26,573 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:26,573 INFO L225 Difference]: With dead ends: 97 [2019-11-06 21:20:26,573 INFO L226 Difference]: Without dead ends: 62 [2019-11-06 21:20:26,574 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 55 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=82, Invalid=190, Unknown=0, NotChecked=0, Total=272 [2019-11-06 21:20:26,574 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2019-11-06 21:20:26,579 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 60. [2019-11-06 21:20:26,579 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2019-11-06 21:20:26,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 61 transitions. [2019-11-06 21:20:26,580 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 61 transitions. Word has length 54 [2019-11-06 21:20:26,581 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:26,581 INFO L462 AbstractCegarLoop]: Abstraction has 60 states and 61 transitions. [2019-11-06 21:20:26,581 INFO L463 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-11-06 21:20:26,581 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 61 transitions. [2019-11-06 21:20:26,582 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2019-11-06 21:20:26,582 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:26,582 INFO L410 BasicCegarLoop]: trace histogram [10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:26,790 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:26,790 INFO L410 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:26,790 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:26,791 INFO L82 PathProgramCache]: Analyzing trace with hash -1274421023, now seen corresponding path program 9 times [2019-11-06 21:20:26,791 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:26,791 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1306484740] [2019-11-06 21:20:26,791 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:26,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:27,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:27,172 INFO L134 CoverageAnalysis]: Checked inductivity of 207 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2019-11-06 21:20:27,172 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1306484740] [2019-11-06 21:20:27,174 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1634159370] [2019-11-06 21:20:27,174 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 21:20:27,313 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2019-11-06 21:20:27,314 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:27,315 INFO L256 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 16 conjunts are in the unsatisfiable core [2019-11-06 21:20:27,320 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:27,351 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-06 21:20:27,379 INFO L134 CoverageAnalysis]: Checked inductivity of 207 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2019-11-06 21:20:27,379 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:27,380 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 18 [2019-11-06 21:20:27,380 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [70432081] [2019-11-06 21:20:27,380 INFO L442 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-11-06 21:20:27,381 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:27,381 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-11-06 21:20:27,382 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=216, Unknown=0, NotChecked=0, Total=306 [2019-11-06 21:20:27,382 INFO L87 Difference]: Start difference. First operand 60 states and 61 transitions. Second operand 18 states. [2019-11-06 21:20:27,557 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:27,557 INFO L93 Difference]: Finished difference Result 105 states and 108 transitions. [2019-11-06 21:20:27,558 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2019-11-06 21:20:27,558 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 59 [2019-11-06 21:20:27,558 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:27,559 INFO L225 Difference]: With dead ends: 105 [2019-11-06 21:20:27,559 INFO L226 Difference]: Without dead ends: 67 [2019-11-06 21:20:27,560 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 58 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=103, Invalid=277, Unknown=0, NotChecked=0, Total=380 [2019-11-06 21:20:27,560 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2019-11-06 21:20:27,565 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 65. [2019-11-06 21:20:27,565 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2019-11-06 21:20:27,566 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 66 transitions. [2019-11-06 21:20:27,566 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 66 transitions. Word has length 59 [2019-11-06 21:20:27,567 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:27,567 INFO L462 AbstractCegarLoop]: Abstraction has 65 states and 66 transitions. [2019-11-06 21:20:27,567 INFO L463 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-11-06 21:20:27,567 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 66 transitions. [2019-11-06 21:20:27,568 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2019-11-06 21:20:27,568 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:27,568 INFO L410 BasicCegarLoop]: trace histogram [11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:27,772 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:27,773 INFO L410 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:27,773 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:27,774 INFO L82 PathProgramCache]: Analyzing trace with hash 1532119590, now seen corresponding path program 10 times [2019-11-06 21:20:27,774 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:27,774 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1780444428] [2019-11-06 21:20:27,775 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:27,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:27,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:27,922 INFO L134 CoverageAnalysis]: Checked inductivity of 255 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2019-11-06 21:20:27,922 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1780444428] [2019-11-06 21:20:27,922 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [454068416] [2019-11-06 21:20:27,923 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 21:20:28,006 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-06 21:20:28,006 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:28,008 INFO L256 TraceCheckSpWp]: Trace formula consists of 164 conjuncts, 12 conjunts are in the unsatisfiable core [2019-11-06 21:20:28,016 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:28,054 INFO L134 CoverageAnalysis]: Checked inductivity of 255 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2019-11-06 21:20:28,055 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:28,055 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 13] total 17 [2019-11-06 21:20:28,055 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1428035415] [2019-11-06 21:20:28,056 INFO L442 AbstractCegarLoop]: Interpolant automaton has 17 states [2019-11-06 21:20:28,056 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:28,056 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2019-11-06 21:20:28,057 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=175, Unknown=0, NotChecked=0, Total=272 [2019-11-06 21:20:28,057 INFO L87 Difference]: Start difference. First operand 65 states and 66 transitions. Second operand 17 states. [2019-11-06 21:20:28,244 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:28,245 INFO L93 Difference]: Finished difference Result 113 states and 116 transitions. [2019-11-06 21:20:28,245 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2019-11-06 21:20:28,245 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 64 [2019-11-06 21:20:28,245 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:28,246 INFO L225 Difference]: With dead ends: 113 [2019-11-06 21:20:28,246 INFO L226 Difference]: Without dead ends: 72 [2019-11-06 21:20:28,248 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 65 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 50 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=107, Invalid=235, Unknown=0, NotChecked=0, Total=342 [2019-11-06 21:20:28,248 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2019-11-06 21:20:28,264 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 70. [2019-11-06 21:20:28,264 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2019-11-06 21:20:28,265 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 71 transitions. [2019-11-06 21:20:28,265 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 71 transitions. Word has length 64 [2019-11-06 21:20:28,265 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:28,266 INFO L462 AbstractCegarLoop]: Abstraction has 70 states and 71 transitions. [2019-11-06 21:20:28,266 INFO L463 AbstractCegarLoop]: Interpolant automaton has 17 states. [2019-11-06 21:20:28,266 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 71 transitions. [2019-11-06 21:20:28,267 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2019-11-06 21:20:28,267 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:28,267 INFO L410 BasicCegarLoop]: trace histogram [12, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:28,473 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:28,473 INFO L410 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:28,473 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:28,474 INFO L82 PathProgramCache]: Analyzing trace with hash -294377795, now seen corresponding path program 11 times [2019-11-06 21:20:28,474 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:28,474 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1311900695] [2019-11-06 21:20:28,475 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:28,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:28,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:28,680 INFO L134 CoverageAnalysis]: Checked inductivity of 308 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2019-11-06 21:20:28,681 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1311900695] [2019-11-06 21:20:28,681 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2121223298] [2019-11-06 21:20:28,681 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 21:20:28,805 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2019-11-06 21:20:28,805 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:28,807 INFO L256 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 13 conjunts are in the unsatisfiable core [2019-11-06 21:20:28,812 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:28,845 INFO L134 CoverageAnalysis]: Checked inductivity of 308 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2019-11-06 21:20:28,845 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:28,845 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 14] total 18 [2019-11-06 21:20:28,846 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [773282213] [2019-11-06 21:20:28,846 INFO L442 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-11-06 21:20:28,846 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:28,847 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-11-06 21:20:28,848 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=195, Unknown=0, NotChecked=0, Total=306 [2019-11-06 21:20:28,848 INFO L87 Difference]: Start difference. First operand 70 states and 71 transitions. Second operand 18 states. [2019-11-06 21:20:29,018 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:29,019 INFO L93 Difference]: Finished difference Result 121 states and 124 transitions. [2019-11-06 21:20:29,019 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-11-06 21:20:29,019 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 69 [2019-11-06 21:20:29,020 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:29,020 INFO L225 Difference]: With dead ends: 121 [2019-11-06 21:20:29,021 INFO L226 Difference]: Without dead ends: 77 [2019-11-06 21:20:29,021 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 70 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=121, Invalid=259, Unknown=0, NotChecked=0, Total=380 [2019-11-06 21:20:29,022 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2019-11-06 21:20:29,031 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 75. [2019-11-06 21:20:29,031 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2019-11-06 21:20:29,032 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 76 transitions. [2019-11-06 21:20:29,032 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 76 transitions. Word has length 69 [2019-11-06 21:20:29,032 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:29,032 INFO L462 AbstractCegarLoop]: Abstraction has 75 states and 76 transitions. [2019-11-06 21:20:29,033 INFO L463 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-11-06 21:20:29,033 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 76 transitions. [2019-11-06 21:20:29,034 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2019-11-06 21:20:29,035 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:29,035 INFO L410 BasicCegarLoop]: trace histogram [13, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:29,246 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:29,246 INFO L410 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:29,246 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:29,246 INFO L82 PathProgramCache]: Analyzing trace with hash -1643412406, now seen corresponding path program 12 times [2019-11-06 21:20:29,246 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:29,247 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [44032417] [2019-11-06 21:20:29,247 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:29,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:29,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:29,427 INFO L134 CoverageAnalysis]: Checked inductivity of 366 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2019-11-06 21:20:29,427 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [44032417] [2019-11-06 21:20:29,427 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1728734521] [2019-11-06 21:20:29,427 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 21:20:29,662 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2019-11-06 21:20:29,663 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:29,664 INFO L256 TraceCheckSpWp]: Trace formula consists of 186 conjuncts, 19 conjunts are in the unsatisfiable core [2019-11-06 21:20:29,666 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:29,684 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-06 21:20:29,725 INFO L134 CoverageAnalysis]: Checked inductivity of 366 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2019-11-06 21:20:29,726 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:29,726 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 21 [2019-11-06 21:20:29,726 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1019143128] [2019-11-06 21:20:29,727 INFO L442 AbstractCegarLoop]: Interpolant automaton has 21 states [2019-11-06 21:20:29,728 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:29,728 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2019-11-06 21:20:29,728 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=288, Unknown=0, NotChecked=0, Total=420 [2019-11-06 21:20:29,728 INFO L87 Difference]: Start difference. First operand 75 states and 76 transitions. Second operand 21 states. [2019-11-06 21:20:29,917 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:29,918 INFO L93 Difference]: Finished difference Result 129 states and 132 transitions. [2019-11-06 21:20:29,922 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-11-06 21:20:29,922 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 74 [2019-11-06 21:20:29,923 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:29,923 INFO L225 Difference]: With dead ends: 129 [2019-11-06 21:20:29,924 INFO L226 Difference]: Without dead ends: 82 [2019-11-06 21:20:29,924 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 73 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 90 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=145, Invalid=361, Unknown=0, NotChecked=0, Total=506 [2019-11-06 21:20:29,925 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2019-11-06 21:20:29,929 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 80. [2019-11-06 21:20:29,929 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2019-11-06 21:20:29,930 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 81 transitions. [2019-11-06 21:20:29,930 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 81 transitions. Word has length 74 [2019-11-06 21:20:29,930 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:29,930 INFO L462 AbstractCegarLoop]: Abstraction has 80 states and 81 transitions. [2019-11-06 21:20:29,931 INFO L463 AbstractCegarLoop]: Interpolant automaton has 21 states. [2019-11-06 21:20:29,931 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 81 transitions. [2019-11-06 21:20:29,931 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2019-11-06 21:20:29,932 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:29,932 INFO L410 BasicCegarLoop]: trace histogram [14, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:30,141 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:30,142 INFO L410 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:30,142 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:30,143 INFO L82 PathProgramCache]: Analyzing trace with hash 1372445849, now seen corresponding path program 13 times [2019-11-06 21:20:30,143 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:30,143 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1063468332] [2019-11-06 21:20:30,144 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:30,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:30,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:30,344 INFO L134 CoverageAnalysis]: Checked inductivity of 429 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 169 trivial. 0 not checked. [2019-11-06 21:20:30,344 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1063468332] [2019-11-06 21:20:30,344 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2070141775] [2019-11-06 21:20:30,344 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 21:20:30,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:30,420 INFO L256 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 15 conjunts are in the unsatisfiable core [2019-11-06 21:20:30,436 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:30,467 INFO L134 CoverageAnalysis]: Checked inductivity of 429 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2019-11-06 21:20:30,467 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:30,467 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 16] total 20 [2019-11-06 21:20:30,468 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [306391532] [2019-11-06 21:20:30,468 INFO L442 AbstractCegarLoop]: Interpolant automaton has 20 states [2019-11-06 21:20:30,468 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:30,468 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2019-11-06 21:20:30,469 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=142, Invalid=238, Unknown=0, NotChecked=0, Total=380 [2019-11-06 21:20:30,469 INFO L87 Difference]: Start difference. First operand 80 states and 81 transitions. Second operand 20 states. [2019-11-06 21:20:30,631 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:30,631 INFO L93 Difference]: Finished difference Result 137 states and 140 transitions. [2019-11-06 21:20:30,632 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2019-11-06 21:20:30,632 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 79 [2019-11-06 21:20:30,632 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:30,633 INFO L225 Difference]: With dead ends: 137 [2019-11-06 21:20:30,633 INFO L226 Difference]: Without dead ends: 87 [2019-11-06 21:20:30,635 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 80 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=152, Invalid=310, Unknown=0, NotChecked=0, Total=462 [2019-11-06 21:20:30,635 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2019-11-06 21:20:30,639 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 85. [2019-11-06 21:20:30,639 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2019-11-06 21:20:30,640 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 86 transitions. [2019-11-06 21:20:30,640 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 86 transitions. Word has length 79 [2019-11-06 21:20:30,640 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:30,640 INFO L462 AbstractCegarLoop]: Abstraction has 85 states and 86 transitions. [2019-11-06 21:20:30,641 INFO L463 AbstractCegarLoop]: Interpolant automaton has 20 states. [2019-11-06 21:20:30,641 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 86 transitions. [2019-11-06 21:20:30,641 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2019-11-06 21:20:30,642 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:30,642 INFO L410 BasicCegarLoop]: trace histogram [15, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:30,846 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:30,846 INFO L410 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:30,847 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:30,847 INFO L82 PathProgramCache]: Analyzing trace with hash 1863872110, now seen corresponding path program 14 times [2019-11-06 21:20:30,847 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:30,848 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2085150761] [2019-11-06 21:20:30,848 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:30,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:31,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:31,036 INFO L134 CoverageAnalysis]: Checked inductivity of 497 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2019-11-06 21:20:31,037 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2085150761] [2019-11-06 21:20:31,037 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [744957767] [2019-11-06 21:20:31,037 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 21:20:31,095 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 21:20:31,095 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:31,096 INFO L256 TraceCheckSpWp]: Trace formula consists of 208 conjuncts, 16 conjunts are in the unsatisfiable core [2019-11-06 21:20:31,097 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:31,131 INFO L134 CoverageAnalysis]: Checked inductivity of 497 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 301 trivial. 0 not checked. [2019-11-06 21:20:31,131 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:31,131 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 17] total 21 [2019-11-06 21:20:31,131 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [425807291] [2019-11-06 21:20:31,132 INFO L442 AbstractCegarLoop]: Interpolant automaton has 21 states [2019-11-06 21:20:31,132 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:31,132 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2019-11-06 21:20:31,133 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=159, Invalid=261, Unknown=0, NotChecked=0, Total=420 [2019-11-06 21:20:31,133 INFO L87 Difference]: Start difference. First operand 85 states and 86 transitions. Second operand 21 states. [2019-11-06 21:20:31,297 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:31,297 INFO L93 Difference]: Finished difference Result 145 states and 148 transitions. [2019-11-06 21:20:31,297 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2019-11-06 21:20:31,297 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 84 [2019-11-06 21:20:31,297 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:31,298 INFO L225 Difference]: With dead ends: 145 [2019-11-06 21:20:31,298 INFO L226 Difference]: Without dead ends: 92 [2019-11-06 21:20:31,299 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 85 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=169, Invalid=337, Unknown=0, NotChecked=0, Total=506 [2019-11-06 21:20:31,299 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2019-11-06 21:20:31,303 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 90. [2019-11-06 21:20:31,303 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2019-11-06 21:20:31,304 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 91 transitions. [2019-11-06 21:20:31,304 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 91 transitions. Word has length 84 [2019-11-06 21:20:31,304 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:31,304 INFO L462 AbstractCegarLoop]: Abstraction has 90 states and 91 transitions. [2019-11-06 21:20:31,304 INFO L463 AbstractCegarLoop]: Interpolant automaton has 21 states. [2019-11-06 21:20:31,305 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 91 transitions. [2019-11-06 21:20:31,305 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2019-11-06 21:20:31,306 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:31,306 INFO L410 BasicCegarLoop]: trace histogram [16, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:31,509 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:31,509 INFO L410 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:31,510 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:31,510 INFO L82 PathProgramCache]: Analyzing trace with hash 2045821557, now seen corresponding path program 15 times [2019-11-06 21:20:31,511 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:31,511 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1374637956] [2019-11-06 21:20:31,511 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:31,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:31,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:31,760 INFO L134 CoverageAnalysis]: Checked inductivity of 570 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 225 trivial. 0 not checked. [2019-11-06 21:20:31,761 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1374637956] [2019-11-06 21:20:31,761 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1742760643] [2019-11-06 21:20:31,761 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 21:20:32,107 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2019-11-06 21:20:32,108 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:32,110 INFO L256 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 17 conjunts are in the unsatisfiable core [2019-11-06 21:20:32,113 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:32,144 INFO L134 CoverageAnalysis]: Checked inductivity of 570 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2019-11-06 21:20:32,145 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:32,145 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 18] total 22 [2019-11-06 21:20:32,145 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [268738201] [2019-11-06 21:20:32,146 INFO L442 AbstractCegarLoop]: Interpolant automaton has 22 states [2019-11-06 21:20:32,146 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:32,146 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2019-11-06 21:20:32,147 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=177, Invalid=285, Unknown=0, NotChecked=0, Total=462 [2019-11-06 21:20:32,147 INFO L87 Difference]: Start difference. First operand 90 states and 91 transitions. Second operand 22 states. [2019-11-06 21:20:32,310 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:32,310 INFO L93 Difference]: Finished difference Result 153 states and 156 transitions. [2019-11-06 21:20:32,311 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2019-11-06 21:20:32,311 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 89 [2019-11-06 21:20:32,311 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:32,312 INFO L225 Difference]: With dead ends: 153 [2019-11-06 21:20:32,312 INFO L226 Difference]: Without dead ends: 97 [2019-11-06 21:20:32,313 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 90 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 75 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=187, Invalid=365, Unknown=0, NotChecked=0, Total=552 [2019-11-06 21:20:32,314 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2019-11-06 21:20:32,317 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 95. [2019-11-06 21:20:32,317 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2019-11-06 21:20:32,318 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 96 transitions. [2019-11-06 21:20:32,318 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 96 transitions. Word has length 89 [2019-11-06 21:20:32,318 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:32,318 INFO L462 AbstractCegarLoop]: Abstraction has 95 states and 96 transitions. [2019-11-06 21:20:32,319 INFO L463 AbstractCegarLoop]: Interpolant automaton has 22 states. [2019-11-06 21:20:32,319 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 96 transitions. [2019-11-06 21:20:32,320 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2019-11-06 21:20:32,320 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:32,320 INFO L410 BasicCegarLoop]: trace histogram [17, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:32,524 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:32,525 INFO L410 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:32,525 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:32,526 INFO L82 PathProgramCache]: Analyzing trace with hash -1839249262, now seen corresponding path program 16 times [2019-11-06 21:20:32,526 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:32,526 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [793928803] [2019-11-06 21:20:32,527 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:32,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:32,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:32,748 INFO L134 CoverageAnalysis]: Checked inductivity of 648 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 256 trivial. 0 not checked. [2019-11-06 21:20:32,748 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [793928803] [2019-11-06 21:20:32,749 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [21333993] [2019-11-06 21:20:32,749 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 21:20:32,814 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-06 21:20:32,815 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:32,816 INFO L256 TraceCheckSpWp]: Trace formula consists of 230 conjuncts, 18 conjunts are in the unsatisfiable core [2019-11-06 21:20:32,817 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:32,840 INFO L134 CoverageAnalysis]: Checked inductivity of 648 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2019-11-06 21:20:32,841 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:32,841 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 19] total 23 [2019-11-06 21:20:32,841 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1760578098] [2019-11-06 21:20:32,842 INFO L442 AbstractCegarLoop]: Interpolant automaton has 23 states [2019-11-06 21:20:32,842 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:32,842 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2019-11-06 21:20:32,843 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=196, Invalid=310, Unknown=0, NotChecked=0, Total=506 [2019-11-06 21:20:32,843 INFO L87 Difference]: Start difference. First operand 95 states and 96 transitions. Second operand 23 states. [2019-11-06 21:20:33,051 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:33,051 INFO L93 Difference]: Finished difference Result 161 states and 164 transitions. [2019-11-06 21:20:33,051 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2019-11-06 21:20:33,051 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 94 [2019-11-06 21:20:33,052 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:33,052 INFO L225 Difference]: With dead ends: 161 [2019-11-06 21:20:33,052 INFO L226 Difference]: Without dead ends: 102 [2019-11-06 21:20:33,053 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 95 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 80 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=206, Invalid=394, Unknown=0, NotChecked=0, Total=600 [2019-11-06 21:20:33,053 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2019-11-06 21:20:33,056 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 100. [2019-11-06 21:20:33,056 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 100 states. [2019-11-06 21:20:33,057 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 101 transitions. [2019-11-06 21:20:33,057 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 101 transitions. Word has length 94 [2019-11-06 21:20:33,057 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:33,057 INFO L462 AbstractCegarLoop]: Abstraction has 100 states and 101 transitions. [2019-11-06 21:20:33,057 INFO L463 AbstractCegarLoop]: Interpolant automaton has 23 states. [2019-11-06 21:20:33,058 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 101 transitions. [2019-11-06 21:20:33,058 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2019-11-06 21:20:33,058 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:33,058 INFO L410 BasicCegarLoop]: trace histogram [18, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:33,259 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:33,259 INFO L410 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:33,260 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:33,260 INFO L82 PathProgramCache]: Analyzing trace with hash 1513527377, now seen corresponding path program 17 times [2019-11-06 21:20:33,260 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:33,261 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1702751558] [2019-11-06 21:20:33,261 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:33,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:33,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:33,490 INFO L134 CoverageAnalysis]: Checked inductivity of 731 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 289 trivial. 0 not checked. [2019-11-06 21:20:33,490 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1702751558] [2019-11-06 21:20:33,490 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1172937618] [2019-11-06 21:20:33,490 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 21:20:33,666 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2019-11-06 21:20:33,666 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:33,668 INFO L256 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 19 conjunts are in the unsatisfiable core [2019-11-06 21:20:33,670 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:33,722 INFO L134 CoverageAnalysis]: Checked inductivity of 731 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2019-11-06 21:20:33,722 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:33,722 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 20] total 24 [2019-11-06 21:20:33,723 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2077047835] [2019-11-06 21:20:33,723 INFO L442 AbstractCegarLoop]: Interpolant automaton has 24 states [2019-11-06 21:20:33,729 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:33,729 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2019-11-06 21:20:33,730 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=216, Invalid=336, Unknown=0, NotChecked=0, Total=552 [2019-11-06 21:20:33,730 INFO L87 Difference]: Start difference. First operand 100 states and 101 transitions. Second operand 24 states. [2019-11-06 21:20:33,944 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:33,944 INFO L93 Difference]: Finished difference Result 169 states and 172 transitions. [2019-11-06 21:20:33,944 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2019-11-06 21:20:33,945 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 99 [2019-11-06 21:20:33,945 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:33,946 INFO L225 Difference]: With dead ends: 169 [2019-11-06 21:20:33,946 INFO L226 Difference]: Without dead ends: 107 [2019-11-06 21:20:33,947 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 100 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=226, Invalid=424, Unknown=0, NotChecked=0, Total=650 [2019-11-06 21:20:33,948 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2019-11-06 21:20:33,951 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 105. [2019-11-06 21:20:33,951 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2019-11-06 21:20:33,952 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 106 transitions. [2019-11-06 21:20:33,952 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 106 transitions. Word has length 99 [2019-11-06 21:20:33,952 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:33,952 INFO L462 AbstractCegarLoop]: Abstraction has 105 states and 106 transitions. [2019-11-06 21:20:33,952 INFO L463 AbstractCegarLoop]: Interpolant automaton has 24 states. [2019-11-06 21:20:33,952 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 106 transitions. [2019-11-06 21:20:33,953 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2019-11-06 21:20:33,953 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:33,953 INFO L410 BasicCegarLoop]: trace histogram [19, 18, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:34,158 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:34,158 INFO L410 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:34,158 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:34,158 INFO L82 PathProgramCache]: Analyzing trace with hash 1179013814, now seen corresponding path program 18 times [2019-11-06 21:20:34,159 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:34,159 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [548476172] [2019-11-06 21:20:34,159 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:34,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:34,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:34,460 INFO L134 CoverageAnalysis]: Checked inductivity of 819 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 324 trivial. 0 not checked. [2019-11-06 21:20:34,460 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [548476172] [2019-11-06 21:20:34,460 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1418056758] [2019-11-06 21:20:34,460 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 21:20:35,823 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2019-11-06 21:20:35,824 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:35,830 INFO L256 TraceCheckSpWp]: Trace formula consists of 252 conjuncts, 20 conjunts are in the unsatisfiable core [2019-11-06 21:20:35,832 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:35,871 INFO L134 CoverageAnalysis]: Checked inductivity of 819 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 495 trivial. 0 not checked. [2019-11-06 21:20:35,871 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:35,871 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 21] total 25 [2019-11-06 21:20:35,872 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1674945860] [2019-11-06 21:20:35,873 INFO L442 AbstractCegarLoop]: Interpolant automaton has 25 states [2019-11-06 21:20:35,873 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:35,874 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2019-11-06 21:20:35,875 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=237, Invalid=363, Unknown=0, NotChecked=0, Total=600 [2019-11-06 21:20:35,875 INFO L87 Difference]: Start difference. First operand 105 states and 106 transitions. Second operand 25 states. [2019-11-06 21:20:36,150 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:36,150 INFO L93 Difference]: Finished difference Result 177 states and 180 transitions. [2019-11-06 21:20:36,150 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2019-11-06 21:20:36,151 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 104 [2019-11-06 21:20:36,151 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:36,151 INFO L225 Difference]: With dead ends: 177 [2019-11-06 21:20:36,152 INFO L226 Difference]: Without dead ends: 112 [2019-11-06 21:20:36,152 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 105 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 90 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=247, Invalid=455, Unknown=0, NotChecked=0, Total=702 [2019-11-06 21:20:36,152 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2019-11-06 21:20:36,154 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 110. [2019-11-06 21:20:36,154 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 110 states. [2019-11-06 21:20:36,155 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 111 transitions. [2019-11-06 21:20:36,155 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 111 transitions. Word has length 104 [2019-11-06 21:20:36,155 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:36,155 INFO L462 AbstractCegarLoop]: Abstraction has 110 states and 111 transitions. [2019-11-06 21:20:36,155 INFO L463 AbstractCegarLoop]: Interpolant automaton has 25 states. [2019-11-06 21:20:36,155 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 111 transitions. [2019-11-06 21:20:36,156 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2019-11-06 21:20:36,156 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:36,157 INFO L410 BasicCegarLoop]: trace histogram [20, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:36,361 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:36,362 INFO L410 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:36,362 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:36,363 INFO L82 PathProgramCache]: Analyzing trace with hash -1720115667, now seen corresponding path program 19 times [2019-11-06 21:20:36,363 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:36,363 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [315500197] [2019-11-06 21:20:36,363 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:36,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:36,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:36,640 INFO L134 CoverageAnalysis]: Checked inductivity of 912 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 361 trivial. 0 not checked. [2019-11-06 21:20:36,640 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [315500197] [2019-11-06 21:20:36,640 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [241319841] [2019-11-06 21:20:36,640 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 21:20:36,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:36,718 INFO L256 TraceCheckSpWp]: Trace formula consists of 263 conjuncts, 21 conjunts are in the unsatisfiable core [2019-11-06 21:20:36,721 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:36,753 INFO L134 CoverageAnalysis]: Checked inductivity of 912 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 551 trivial. 0 not checked. [2019-11-06 21:20:36,754 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:36,754 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 22] total 26 [2019-11-06 21:20:36,754 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1831244762] [2019-11-06 21:20:36,755 INFO L442 AbstractCegarLoop]: Interpolant automaton has 26 states [2019-11-06 21:20:36,755 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:36,755 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2019-11-06 21:20:36,755 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=259, Invalid=391, Unknown=0, NotChecked=0, Total=650 [2019-11-06 21:20:36,756 INFO L87 Difference]: Start difference. First operand 110 states and 111 transitions. Second operand 26 states. [2019-11-06 21:20:36,986 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:36,986 INFO L93 Difference]: Finished difference Result 185 states and 188 transitions. [2019-11-06 21:20:36,989 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2019-11-06 21:20:36,989 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 109 [2019-11-06 21:20:36,989 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:36,990 INFO L225 Difference]: With dead ends: 185 [2019-11-06 21:20:36,991 INFO L226 Difference]: Without dead ends: 117 [2019-11-06 21:20:36,991 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 110 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 95 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=269, Invalid=487, Unknown=0, NotChecked=0, Total=756 [2019-11-06 21:20:36,992 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2019-11-06 21:20:36,994 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 115. [2019-11-06 21:20:36,994 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2019-11-06 21:20:36,995 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 116 transitions. [2019-11-06 21:20:36,995 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 116 transitions. Word has length 109 [2019-11-06 21:20:36,995 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:36,995 INFO L462 AbstractCegarLoop]: Abstraction has 115 states and 116 transitions. [2019-11-06 21:20:36,995 INFO L463 AbstractCegarLoop]: Interpolant automaton has 26 states. [2019-11-06 21:20:36,995 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 116 transitions. [2019-11-06 21:20:36,997 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2019-11-06 21:20:36,997 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:36,997 INFO L410 BasicCegarLoop]: trace histogram [21, 20, 20, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:37,200 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:37,201 INFO L410 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:37,201 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:37,201 INFO L82 PathProgramCache]: Analyzing trace with hash -407647014, now seen corresponding path program 20 times [2019-11-06 21:20:37,201 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:37,201 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1590706404] [2019-11-06 21:20:37,202 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:37,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:37,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:37,611 INFO L134 CoverageAnalysis]: Checked inductivity of 1010 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 400 trivial. 0 not checked. [2019-11-06 21:20:37,612 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1590706404] [2019-11-06 21:20:37,612 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [913244414] [2019-11-06 21:20:37,612 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 21:20:37,749 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 21:20:37,750 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:37,752 INFO L256 TraceCheckSpWp]: Trace formula consists of 274 conjuncts, 22 conjunts are in the unsatisfiable core [2019-11-06 21:20:37,755 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:37,800 INFO L134 CoverageAnalysis]: Checked inductivity of 1010 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 610 trivial. 0 not checked. [2019-11-06 21:20:37,800 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:37,801 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 23] total 27 [2019-11-06 21:20:37,803 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1484660148] [2019-11-06 21:20:37,804 INFO L442 AbstractCegarLoop]: Interpolant automaton has 27 states [2019-11-06 21:20:37,804 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:37,805 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2019-11-06 21:20:37,805 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=282, Invalid=420, Unknown=0, NotChecked=0, Total=702 [2019-11-06 21:20:37,805 INFO L87 Difference]: Start difference. First operand 115 states and 116 transitions. Second operand 27 states. [2019-11-06 21:20:38,155 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:38,156 INFO L93 Difference]: Finished difference Result 193 states and 196 transitions. [2019-11-06 21:20:38,156 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2019-11-06 21:20:38,156 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 114 [2019-11-06 21:20:38,157 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:38,158 INFO L225 Difference]: With dead ends: 193 [2019-11-06 21:20:38,158 INFO L226 Difference]: Without dead ends: 122 [2019-11-06 21:20:38,159 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 115 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 100 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=292, Invalid=520, Unknown=0, NotChecked=0, Total=812 [2019-11-06 21:20:38,160 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2019-11-06 21:20:38,165 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 120. [2019-11-06 21:20:38,166 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 120 states. [2019-11-06 21:20:38,167 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 121 transitions. [2019-11-06 21:20:38,168 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 121 transitions. Word has length 114 [2019-11-06 21:20:38,168 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:38,168 INFO L462 AbstractCegarLoop]: Abstraction has 120 states and 121 transitions. [2019-11-06 21:20:38,168 INFO L463 AbstractCegarLoop]: Interpolant automaton has 27 states. [2019-11-06 21:20:38,169 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 121 transitions. [2019-11-06 21:20:38,170 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2019-11-06 21:20:38,170 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:38,170 INFO L410 BasicCegarLoop]: trace histogram [22, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:38,376 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:38,376 INFO L410 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:38,377 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:38,377 INFO L82 PathProgramCache]: Analyzing trace with hash -300805111, now seen corresponding path program 21 times [2019-11-06 21:20:38,377 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:38,378 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1203291829] [2019-11-06 21:20:38,378 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:38,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:38,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:38,737 INFO L134 CoverageAnalysis]: Checked inductivity of 1113 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 441 trivial. 0 not checked. [2019-11-06 21:20:38,737 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1203291829] [2019-11-06 21:20:38,737 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [554877676] [2019-11-06 21:20:38,737 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 21:20:40,650 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2019-11-06 21:20:40,650 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:40,654 INFO L256 TraceCheckSpWp]: Trace formula consists of 285 conjuncts, 23 conjunts are in the unsatisfiable core [2019-11-06 21:20:40,656 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:40,685 INFO L134 CoverageAnalysis]: Checked inductivity of 1113 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 672 trivial. 0 not checked. [2019-11-06 21:20:40,689 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:40,689 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 24] total 28 [2019-11-06 21:20:40,689 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1078074602] [2019-11-06 21:20:40,690 INFO L442 AbstractCegarLoop]: Interpolant automaton has 28 states [2019-11-06 21:20:40,690 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:40,690 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2019-11-06 21:20:40,691 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=306, Invalid=450, Unknown=0, NotChecked=0, Total=756 [2019-11-06 21:20:40,691 INFO L87 Difference]: Start difference. First operand 120 states and 121 transitions. Second operand 28 states. [2019-11-06 21:20:40,928 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:40,928 INFO L93 Difference]: Finished difference Result 201 states and 204 transitions. [2019-11-06 21:20:40,929 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2019-11-06 21:20:40,929 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 119 [2019-11-06 21:20:40,929 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:40,930 INFO L225 Difference]: With dead ends: 201 [2019-11-06 21:20:40,930 INFO L226 Difference]: Without dead ends: 127 [2019-11-06 21:20:40,931 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 120 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 105 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=316, Invalid=554, Unknown=0, NotChecked=0, Total=870 [2019-11-06 21:20:40,932 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2019-11-06 21:20:40,935 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 125. [2019-11-06 21:20:40,935 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 125 states. [2019-11-06 21:20:40,936 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 126 transitions. [2019-11-06 21:20:40,936 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 126 transitions. Word has length 119 [2019-11-06 21:20:40,936 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:40,936 INFO L462 AbstractCegarLoop]: Abstraction has 125 states and 126 transitions. [2019-11-06 21:20:40,936 INFO L463 AbstractCegarLoop]: Interpolant automaton has 28 states. [2019-11-06 21:20:40,936 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 126 transitions. [2019-11-06 21:20:40,937 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2019-11-06 21:20:40,937 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:40,937 INFO L410 BasicCegarLoop]: trace histogram [23, 22, 22, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:41,143 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:41,144 INFO L410 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:41,144 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:41,144 INFO L82 PathProgramCache]: Analyzing trace with hash -1777469698, now seen corresponding path program 22 times [2019-11-06 21:20:41,145 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:41,145 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [475436595] [2019-11-06 21:20:41,145 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:41,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:41,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:41,562 INFO L134 CoverageAnalysis]: Checked inductivity of 1221 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 484 trivial. 0 not checked. [2019-11-06 21:20:41,562 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [475436595] [2019-11-06 21:20:41,563 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1318765347] [2019-11-06 21:20:41,563 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 21:20:41,683 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-06 21:20:41,683 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:41,686 INFO L256 TraceCheckSpWp]: Trace formula consists of 296 conjuncts, 24 conjunts are in the unsatisfiable core [2019-11-06 21:20:41,690 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:41,749 INFO L134 CoverageAnalysis]: Checked inductivity of 1221 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 737 trivial. 0 not checked. [2019-11-06 21:20:41,749 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:41,750 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 25] total 29 [2019-11-06 21:20:41,750 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2066346110] [2019-11-06 21:20:41,751 INFO L442 AbstractCegarLoop]: Interpolant automaton has 29 states [2019-11-06 21:20:41,751 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:41,751 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2019-11-06 21:20:41,752 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=331, Invalid=481, Unknown=0, NotChecked=0, Total=812 [2019-11-06 21:20:41,752 INFO L87 Difference]: Start difference. First operand 125 states and 126 transitions. Second operand 29 states. [2019-11-06 21:20:42,083 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:42,083 INFO L93 Difference]: Finished difference Result 209 states and 212 transitions. [2019-11-06 21:20:42,083 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2019-11-06 21:20:42,083 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 124 [2019-11-06 21:20:42,084 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:42,084 INFO L225 Difference]: With dead ends: 209 [2019-11-06 21:20:42,084 INFO L226 Difference]: Without dead ends: 132 [2019-11-06 21:20:42,085 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 125 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 110 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=341, Invalid=589, Unknown=0, NotChecked=0, Total=930 [2019-11-06 21:20:42,085 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2019-11-06 21:20:42,088 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 130. [2019-11-06 21:20:42,088 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 130 states. [2019-11-06 21:20:42,089 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 131 transitions. [2019-11-06 21:20:42,089 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 131 transitions. Word has length 124 [2019-11-06 21:20:42,090 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:42,090 INFO L462 AbstractCegarLoop]: Abstraction has 130 states and 131 transitions. [2019-11-06 21:20:42,090 INFO L463 AbstractCegarLoop]: Interpolant automaton has 29 states. [2019-11-06 21:20:42,090 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 131 transitions. [2019-11-06 21:20:42,090 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2019-11-06 21:20:42,091 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:42,091 INFO L410 BasicCegarLoop]: trace histogram [24, 23, 23, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:42,294 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:42,295 INFO L410 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:42,295 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:42,295 INFO L82 PathProgramCache]: Analyzing trace with hash 2044410341, now seen corresponding path program 23 times [2019-11-06 21:20:42,296 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:42,296 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [973085409] [2019-11-06 21:20:42,296 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:42,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:42,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:42,685 INFO L134 CoverageAnalysis]: Checked inductivity of 1334 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 529 trivial. 0 not checked. [2019-11-06 21:20:42,686 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [973085409] [2019-11-06 21:20:42,686 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [342898827] [2019-11-06 21:20:42,686 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 21:20:43,171 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 24 check-sat command(s) [2019-11-06 21:20:43,171 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:43,174 INFO L256 TraceCheckSpWp]: Trace formula consists of 307 conjuncts, 25 conjunts are in the unsatisfiable core [2019-11-06 21:20:43,176 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:43,203 INFO L134 CoverageAnalysis]: Checked inductivity of 1334 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 805 trivial. 0 not checked. [2019-11-06 21:20:43,204 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:43,204 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 26] total 30 [2019-11-06 21:20:43,204 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1167085031] [2019-11-06 21:20:43,205 INFO L442 AbstractCegarLoop]: Interpolant automaton has 30 states [2019-11-06 21:20:43,205 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:43,205 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2019-11-06 21:20:43,206 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=357, Invalid=513, Unknown=0, NotChecked=0, Total=870 [2019-11-06 21:20:43,206 INFO L87 Difference]: Start difference. First operand 130 states and 131 transitions. Second operand 30 states. [2019-11-06 21:20:43,425 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:43,425 INFO L93 Difference]: Finished difference Result 217 states and 220 transitions. [2019-11-06 21:20:43,425 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2019-11-06 21:20:43,425 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 129 [2019-11-06 21:20:43,426 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:43,427 INFO L225 Difference]: With dead ends: 217 [2019-11-06 21:20:43,427 INFO L226 Difference]: Without dead ends: 137 [2019-11-06 21:20:43,428 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 130 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 115 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=367, Invalid=625, Unknown=0, NotChecked=0, Total=992 [2019-11-06 21:20:43,428 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2019-11-06 21:20:43,432 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 135. [2019-11-06 21:20:43,432 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 135 states. [2019-11-06 21:20:43,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 136 transitions. [2019-11-06 21:20:43,433 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 136 transitions. Word has length 129 [2019-11-06 21:20:43,433 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:43,434 INFO L462 AbstractCegarLoop]: Abstraction has 135 states and 136 transitions. [2019-11-06 21:20:43,434 INFO L463 AbstractCegarLoop]: Interpolant automaton has 30 states. [2019-11-06 21:20:43,434 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 136 transitions. [2019-11-06 21:20:43,434 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2019-11-06 21:20:43,434 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:43,435 INFO L410 BasicCegarLoop]: trace histogram [25, 24, 24, 24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:43,639 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:43,640 INFO L410 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:43,640 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:43,640 INFO L82 PathProgramCache]: Analyzing trace with hash -683994846, now seen corresponding path program 24 times [2019-11-06 21:20:43,641 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:43,641 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2035106441] [2019-11-06 21:20:43,641 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:43,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:44,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:44,194 INFO L134 CoverageAnalysis]: Checked inductivity of 1452 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 576 trivial. 0 not checked. [2019-11-06 21:20:44,194 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2035106441] [2019-11-06 21:20:44,194 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [503273757] [2019-11-06 21:20:44,195 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 21:20:49,039 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 25 check-sat command(s) [2019-11-06 21:20:49,039 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:49,045 INFO L256 TraceCheckSpWp]: Trace formula consists of 318 conjuncts, 26 conjunts are in the unsatisfiable core [2019-11-06 21:20:49,047 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:49,072 INFO L134 CoverageAnalysis]: Checked inductivity of 1452 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 876 trivial. 0 not checked. [2019-11-06 21:20:49,073 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:49,073 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 27] total 31 [2019-11-06 21:20:49,073 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [812452550] [2019-11-06 21:20:49,073 INFO L442 AbstractCegarLoop]: Interpolant automaton has 31 states [2019-11-06 21:20:49,073 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:49,074 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2019-11-06 21:20:49,074 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=384, Invalid=546, Unknown=0, NotChecked=0, Total=930 [2019-11-06 21:20:49,074 INFO L87 Difference]: Start difference. First operand 135 states and 136 transitions. Second operand 31 states. [2019-11-06 21:20:49,327 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:49,328 INFO L93 Difference]: Finished difference Result 225 states and 228 transitions. [2019-11-06 21:20:49,328 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2019-11-06 21:20:49,328 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 134 [2019-11-06 21:20:49,328 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:49,329 INFO L225 Difference]: With dead ends: 225 [2019-11-06 21:20:49,330 INFO L226 Difference]: Without dead ends: 142 [2019-11-06 21:20:49,331 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 135 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=394, Invalid=662, Unknown=0, NotChecked=0, Total=1056 [2019-11-06 21:20:49,331 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2019-11-06 21:20:49,334 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 140. [2019-11-06 21:20:49,334 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 140 states. [2019-11-06 21:20:49,335 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 141 transitions. [2019-11-06 21:20:49,335 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 141 transitions. Word has length 134 [2019-11-06 21:20:49,335 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:49,335 INFO L462 AbstractCegarLoop]: Abstraction has 140 states and 141 transitions. [2019-11-06 21:20:49,335 INFO L463 AbstractCegarLoop]: Interpolant automaton has 31 states. [2019-11-06 21:20:49,336 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 141 transitions. [2019-11-06 21:20:49,336 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2019-11-06 21:20:49,336 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:49,337 INFO L410 BasicCegarLoop]: trace histogram [26, 25, 25, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:49,543 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:49,543 INFO L410 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:49,543 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:49,544 INFO L82 PathProgramCache]: Analyzing trace with hash 640569281, now seen corresponding path program 25 times [2019-11-06 21:20:49,544 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:49,544 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [689417778] [2019-11-06 21:20:49,545 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:49,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:50,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:50,042 INFO L134 CoverageAnalysis]: Checked inductivity of 1575 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 625 trivial. 0 not checked. [2019-11-06 21:20:50,043 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [689417778] [2019-11-06 21:20:50,043 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1336453868] [2019-11-06 21:20:50,043 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 21:20:50,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:50,148 INFO L256 TraceCheckSpWp]: Trace formula consists of 329 conjuncts, 27 conjunts are in the unsatisfiable core [2019-11-06 21:20:50,151 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:50,181 INFO L134 CoverageAnalysis]: Checked inductivity of 1575 backedges. 0 proven. 625 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2019-11-06 21:20:50,182 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:50,182 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 28] total 32 [2019-11-06 21:20:50,182 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1121448457] [2019-11-06 21:20:50,183 INFO L442 AbstractCegarLoop]: Interpolant automaton has 32 states [2019-11-06 21:20:50,183 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:50,183 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2019-11-06 21:20:50,183 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=412, Invalid=580, Unknown=0, NotChecked=0, Total=992 [2019-11-06 21:20:50,184 INFO L87 Difference]: Start difference. First operand 140 states and 141 transitions. Second operand 32 states. [2019-11-06 21:20:50,457 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:50,457 INFO L93 Difference]: Finished difference Result 233 states and 236 transitions. [2019-11-06 21:20:50,457 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2019-11-06 21:20:50,458 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 139 [2019-11-06 21:20:50,458 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:50,459 INFO L225 Difference]: With dead ends: 233 [2019-11-06 21:20:50,459 INFO L226 Difference]: Without dead ends: 147 [2019-11-06 21:20:50,460 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 140 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 125 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=422, Invalid=700, Unknown=0, NotChecked=0, Total=1122 [2019-11-06 21:20:50,461 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 147 states. [2019-11-06 21:20:50,464 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 147 to 145. [2019-11-06 21:20:50,465 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 145 states. [2019-11-06 21:20:50,465 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 145 states to 145 states and 146 transitions. [2019-11-06 21:20:50,465 INFO L78 Accepts]: Start accepts. Automaton has 145 states and 146 transitions. Word has length 139 [2019-11-06 21:20:50,466 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:50,466 INFO L462 AbstractCegarLoop]: Abstraction has 145 states and 146 transitions. [2019-11-06 21:20:50,466 INFO L463 AbstractCegarLoop]: Interpolant automaton has 32 states. [2019-11-06 21:20:50,466 INFO L276 IsEmpty]: Start isEmpty. Operand 145 states and 146 transitions. [2019-11-06 21:20:50,467 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2019-11-06 21:20:50,467 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:50,467 INFO L410 BasicCegarLoop]: trace histogram [27, 26, 26, 26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:50,667 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:50,668 INFO L410 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:50,668 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:50,668 INFO L82 PathProgramCache]: Analyzing trace with hash 1000430406, now seen corresponding path program 26 times [2019-11-06 21:20:50,669 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:50,669 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1030232538] [2019-11-06 21:20:50,669 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:50,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:51,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:51,103 INFO L134 CoverageAnalysis]: Checked inductivity of 1703 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 676 trivial. 0 not checked. [2019-11-06 21:20:51,103 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1030232538] [2019-11-06 21:20:51,103 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [614285969] [2019-11-06 21:20:51,103 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 21:20:51,208 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 21:20:51,208 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:51,210 INFO L256 TraceCheckSpWp]: Trace formula consists of 340 conjuncts, 28 conjunts are in the unsatisfiable core [2019-11-06 21:20:51,212 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:51,246 INFO L134 CoverageAnalysis]: Checked inductivity of 1703 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 1027 trivial. 0 not checked. [2019-11-06 21:20:51,246 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:51,246 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 29] total 33 [2019-11-06 21:20:51,246 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [556961948] [2019-11-06 21:20:51,247 INFO L442 AbstractCegarLoop]: Interpolant automaton has 33 states [2019-11-06 21:20:51,247 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:51,247 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2019-11-06 21:20:51,248 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=441, Invalid=615, Unknown=0, NotChecked=0, Total=1056 [2019-11-06 21:20:51,248 INFO L87 Difference]: Start difference. First operand 145 states and 146 transitions. Second operand 33 states. [2019-11-06 21:20:51,552 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:51,552 INFO L93 Difference]: Finished difference Result 241 states and 244 transitions. [2019-11-06 21:20:51,553 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2019-11-06 21:20:51,553 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 144 [2019-11-06 21:20:51,553 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:51,554 INFO L225 Difference]: With dead ends: 241 [2019-11-06 21:20:51,554 INFO L226 Difference]: Without dead ends: 152 [2019-11-06 21:20:51,556 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 145 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 130 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=451, Invalid=739, Unknown=0, NotChecked=0, Total=1190 [2019-11-06 21:20:51,556 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2019-11-06 21:20:51,560 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 150. [2019-11-06 21:20:51,560 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 150 states. [2019-11-06 21:20:51,561 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 151 transitions. [2019-11-06 21:20:51,561 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 151 transitions. Word has length 144 [2019-11-06 21:20:51,562 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:51,562 INFO L462 AbstractCegarLoop]: Abstraction has 150 states and 151 transitions. [2019-11-06 21:20:51,562 INFO L463 AbstractCegarLoop]: Interpolant automaton has 33 states. [2019-11-06 21:20:51,562 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 151 transitions. [2019-11-06 21:20:51,563 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2019-11-06 21:20:51,563 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:51,563 INFO L410 BasicCegarLoop]: trace histogram [28, 27, 27, 27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:51,766 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:51,766 INFO L410 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:51,767 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:51,767 INFO L82 PathProgramCache]: Analyzing trace with hash -1763939, now seen corresponding path program 27 times [2019-11-06 21:20:51,767 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:51,767 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [715749597] [2019-11-06 21:20:51,768 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:51,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:52,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:52,206 INFO L134 CoverageAnalysis]: Checked inductivity of 1836 backedges. 0 proven. 1107 refuted. 0 times theorem prover too weak. 729 trivial. 0 not checked. [2019-11-06 21:20:52,206 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [715749597] [2019-11-06 21:20:52,206 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1980395997] [2019-11-06 21:20:52,206 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 21:20:57,390 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 28 check-sat command(s) [2019-11-06 21:20:57,390 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:57,397 INFO L256 TraceCheckSpWp]: Trace formula consists of 351 conjuncts, 29 conjunts are in the unsatisfiable core [2019-11-06 21:20:57,400 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:57,444 INFO L134 CoverageAnalysis]: Checked inductivity of 1836 backedges. 0 proven. 729 refuted. 0 times theorem prover too weak. 1107 trivial. 0 not checked. [2019-11-06 21:20:57,444 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:57,444 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 30] total 34 [2019-11-06 21:20:57,444 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1735927209] [2019-11-06 21:20:57,445 INFO L442 AbstractCegarLoop]: Interpolant automaton has 34 states [2019-11-06 21:20:57,445 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:57,445 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2019-11-06 21:20:57,446 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=471, Invalid=651, Unknown=0, NotChecked=0, Total=1122 [2019-11-06 21:20:57,446 INFO L87 Difference]: Start difference. First operand 150 states and 151 transitions. Second operand 34 states. [2019-11-06 21:20:57,780 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:57,780 INFO L93 Difference]: Finished difference Result 249 states and 252 transitions. [2019-11-06 21:20:57,781 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2019-11-06 21:20:57,781 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 149 [2019-11-06 21:20:57,781 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:57,782 INFO L225 Difference]: With dead ends: 249 [2019-11-06 21:20:57,782 INFO L226 Difference]: Without dead ends: 157 [2019-11-06 21:20:57,784 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 184 GetRequests, 150 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 135 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=481, Invalid=779, Unknown=0, NotChecked=0, Total=1260 [2019-11-06 21:20:57,784 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2019-11-06 21:20:57,787 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 155. [2019-11-06 21:20:57,788 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 155 states. [2019-11-06 21:20:57,788 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 155 states to 155 states and 156 transitions. [2019-11-06 21:20:57,789 INFO L78 Accepts]: Start accepts. Automaton has 155 states and 156 transitions. Word has length 149 [2019-11-06 21:20:57,789 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:57,789 INFO L462 AbstractCegarLoop]: Abstraction has 155 states and 156 transitions. [2019-11-06 21:20:57,789 INFO L463 AbstractCegarLoop]: Interpolant automaton has 34 states. [2019-11-06 21:20:57,790 INFO L276 IsEmpty]: Start isEmpty. Operand 155 states and 156 transitions. [2019-11-06 21:20:57,791 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 155 [2019-11-06 21:20:57,791 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:57,791 INFO L410 BasicCegarLoop]: trace histogram [29, 28, 28, 28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:58,000 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:58,000 INFO L410 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:58,001 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:58,001 INFO L82 PathProgramCache]: Analyzing trace with hash 36115818, now seen corresponding path program 28 times [2019-11-06 21:20:58,001 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:58,002 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1771216975] [2019-11-06 21:20:58,002 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:58,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:58,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:58,525 INFO L134 CoverageAnalysis]: Checked inductivity of 1974 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 784 trivial. 0 not checked. [2019-11-06 21:20:58,526 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1771216975] [2019-11-06 21:20:58,526 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [431268792] [2019-11-06 21:20:58,526 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 21:20:58,635 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-06 21:20:58,635 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:58,637 INFO L256 TraceCheckSpWp]: Trace formula consists of 362 conjuncts, 30 conjunts are in the unsatisfiable core [2019-11-06 21:20:58,640 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:58,670 INFO L134 CoverageAnalysis]: Checked inductivity of 1974 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 1190 trivial. 0 not checked. [2019-11-06 21:20:58,670 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:58,671 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 31] total 35 [2019-11-06 21:20:58,671 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [594120467] [2019-11-06 21:20:58,671 INFO L442 AbstractCegarLoop]: Interpolant automaton has 35 states [2019-11-06 21:20:58,671 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:58,672 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2019-11-06 21:20:58,672 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=502, Invalid=688, Unknown=0, NotChecked=0, Total=1190 [2019-11-06 21:20:58,672 INFO L87 Difference]: Start difference. First operand 155 states and 156 transitions. Second operand 35 states. [2019-11-06 21:20:59,023 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:59,024 INFO L93 Difference]: Finished difference Result 257 states and 260 transitions. [2019-11-06 21:20:59,024 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2019-11-06 21:20:59,024 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 154 [2019-11-06 21:20:59,025 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:59,026 INFO L225 Difference]: With dead ends: 257 [2019-11-06 21:20:59,026 INFO L226 Difference]: Without dead ends: 162 [2019-11-06 21:20:59,027 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 190 GetRequests, 155 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=512, Invalid=820, Unknown=0, NotChecked=0, Total=1332 [2019-11-06 21:20:59,028 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2019-11-06 21:20:59,032 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 160. [2019-11-06 21:20:59,032 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 160 states. [2019-11-06 21:20:59,033 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 161 transitions. [2019-11-06 21:20:59,033 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 161 transitions. Word has length 154 [2019-11-06 21:20:59,033 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:59,033 INFO L462 AbstractCegarLoop]: Abstraction has 160 states and 161 transitions. [2019-11-06 21:20:59,033 INFO L463 AbstractCegarLoop]: Interpolant automaton has 35 states. [2019-11-06 21:20:59,033 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 161 transitions. [2019-11-06 21:20:59,034 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2019-11-06 21:20:59,034 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:59,035 INFO L410 BasicCegarLoop]: trace histogram [30, 29, 29, 29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:59,238 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:59,239 INFO L410 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:59,239 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:59,239 INFO L82 PathProgramCache]: Analyzing trace with hash -1822864519, now seen corresponding path program 29 times [2019-11-06 21:20:59,239 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:59,239 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [895690933] [2019-11-06 21:20:59,239 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:59,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:59,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:59,862 INFO L134 CoverageAnalysis]: Checked inductivity of 2117 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 841 trivial. 0 not checked. [2019-11-06 21:20:59,862 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [895690933] [2019-11-06 21:20:59,862 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [226711838] [2019-11-06 21:20:59,863 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 21:21:00,510 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 30 check-sat command(s) [2019-11-06 21:21:00,510 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:21:00,514 INFO L256 TraceCheckSpWp]: Trace formula consists of 373 conjuncts, 31 conjunts are in the unsatisfiable core [2019-11-06 21:21:00,516 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:21:00,547 INFO L134 CoverageAnalysis]: Checked inductivity of 2117 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 1276 trivial. 0 not checked. [2019-11-06 21:21:00,547 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:21:00,547 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 32] total 36 [2019-11-06 21:21:00,548 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1326709179] [2019-11-06 21:21:00,548 INFO L442 AbstractCegarLoop]: Interpolant automaton has 36 states [2019-11-06 21:21:00,548 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:21:00,549 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2019-11-06 21:21:00,549 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=534, Invalid=726, Unknown=0, NotChecked=0, Total=1260 [2019-11-06 21:21:00,549 INFO L87 Difference]: Start difference. First operand 160 states and 161 transitions. Second operand 36 states. [2019-11-06 21:21:00,966 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:21:00,966 INFO L93 Difference]: Finished difference Result 265 states and 268 transitions. [2019-11-06 21:21:00,967 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2019-11-06 21:21:00,967 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 159 [2019-11-06 21:21:00,967 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:21:00,969 INFO L225 Difference]: With dead ends: 265 [2019-11-06 21:21:00,969 INFO L226 Difference]: Without dead ends: 167 [2019-11-06 21:21:00,970 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 160 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 145 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=544, Invalid=862, Unknown=0, NotChecked=0, Total=1406 [2019-11-06 21:21:00,970 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 167 states. [2019-11-06 21:21:00,976 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 167 to 165. [2019-11-06 21:21:00,976 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 165 states. [2019-11-06 21:21:00,977 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 165 states to 165 states and 166 transitions. [2019-11-06 21:21:00,978 INFO L78 Accepts]: Start accepts. Automaton has 165 states and 166 transitions. Word has length 159 [2019-11-06 21:21:00,978 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:21:00,978 INFO L462 AbstractCegarLoop]: Abstraction has 165 states and 166 transitions. [2019-11-06 21:21:00,978 INFO L463 AbstractCegarLoop]: Interpolant automaton has 36 states. [2019-11-06 21:21:00,979 INFO L276 IsEmpty]: Start isEmpty. Operand 165 states and 166 transitions. [2019-11-06 21:21:00,980 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2019-11-06 21:21:00,980 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:21:00,981 INFO L410 BasicCegarLoop]: trace histogram [31, 30, 30, 30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:21:01,187 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:21:01,188 INFO L410 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:21:01,188 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:21:01,188 INFO L82 PathProgramCache]: Analyzing trace with hash -1137541234, now seen corresponding path program 30 times [2019-11-06 21:21:01,188 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:21:01,189 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1871434845] [2019-11-06 21:21:01,189 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:21:01,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:21:01,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:21:01,754 INFO L134 CoverageAnalysis]: Checked inductivity of 2265 backedges. 0 proven. 1365 refuted. 0 times theorem prover too weak. 900 trivial. 0 not checked. [2019-11-06 21:21:01,754 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1871434845] [2019-11-06 21:21:01,754 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2066701514] [2019-11-06 21:21:01,754 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