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/loops-crafted-1/Mono6_1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-0883e75 [2019-09-05 12:16:17,495 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-09-05 12:16:17,497 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-09-05 12:16:17,514 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2019-09-05 12:16:17,536 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-09-05 12:16:17,539 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-09-05 12:16:17,540 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-09-05 12:16:17,541 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-09-05 12:16:17,542 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-09-05 12:16:17,543 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-09-05 12:16:17,548 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-09-05 12:16:17,551 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-09-05 12:16:17,554 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-09-05 12:16:17,556 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-09-05 12:16:17,560 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-09-05 12:16:17,561 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-09-05 12:16:17,564 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-09-05 12:16:17,579 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-09-05 12:16:17,580 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-09-05 12:16:17,580 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-09-05 12:16:17,582 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 [2019-09-05 12:16:17,602 INFO L113 SettingsManager]: Loading preferences was successful [2019-09-05 12:16:17,602 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-09-05 12:16:17,606 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-09-05 12:16:17,606 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-09-05 12:16:17,606 INFO L138 SettingsManager]: * Use SBE=true [2019-09-05 12:16:17,607 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-09-05 12:16:17,607 INFO L138 SettingsManager]: * sizeof long=4 [2019-09-05 12:16:17,607 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-09-05 12:16:17,607 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-09-05 12:16:17,608 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-09-05 12:16:17,609 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-09-05 12:16:17,609 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-09-05 12:16:17,609 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-09-05 12:16:17,610 INFO L138 SettingsManager]: * sizeof long double=12 [2019-09-05 12:16:17,610 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-09-05 12:16:17,610 INFO L138 SettingsManager]: * Use constant arrays=true [2019-09-05 12:16:17,610 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-09-05 12:16:17,610 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-09-05 12:16:17,611 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-09-05 12:16:17,611 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-09-05 12:16:17,612 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-09-05 12:16:17,612 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-09-05 12:16:17,612 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-09-05 12:16:17,612 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-09-05 12:16:17,613 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-09-05 12:16:17,613 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-09-05 12:16:17,613 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-09-05 12:16:17,613 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-09-05 12:16:17,613 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-09-05 12:16:17,640 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-09-05 12:16:17,652 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-09-05 12:16:17,655 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-09-05 12:16:17,657 INFO L271 PluginConnector]: Initializing CDTParser... [2019-09-05 12:16:17,657 INFO L275 PluginConnector]: CDTParser initialized [2019-09-05 12:16:17,658 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/Mono6_1.c [2019-09-05 12:16:17,727 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0f591f515/9f4b1e554ec44091a1a1e4907268447b/FLAGe7bc28d39 [2019-09-05 12:16:18,174 INFO L306 CDTParser]: Found 1 translation units. [2019-09-05 12:16:18,174 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/Mono6_1.c [2019-09-05 12:16:18,180 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0f591f515/9f4b1e554ec44091a1a1e4907268447b/FLAGe7bc28d39 [2019-09-05 12:16:18,565 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0f591f515/9f4b1e554ec44091a1a1e4907268447b [2019-09-05 12:16:18,575 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-09-05 12:16:18,576 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-09-05 12:16:18,577 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-09-05 12:16:18,578 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-09-05 12:16:18,581 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-09-05 12:16:18,582 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 05.09 12:16:18" (1/1) ... [2019-09-05 12:16:18,585 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2a83a43e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 12:16:18, skipping insertion in model container [2019-09-05 12:16:18,585 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 05.09 12:16:18" (1/1) ... [2019-09-05 12:16:18,591 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-09-05 12:16:18,604 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-09-05 12:16:18,791 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-09-05 12:16:18,806 INFO L188 MainTranslator]: Completed pre-run [2019-09-05 12:16:18,823 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-09-05 12:16:18,834 INFO L192 MainTranslator]: Completed translation [2019-09-05 12:16:18,834 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 12:16:18 WrapperNode [2019-09-05 12:16:18,834 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-09-05 12:16:18,836 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-09-05 12:16:18,836 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-09-05 12:16:18,837 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-09-05 12:16:18,929 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 12:16:18" (1/1) ... [2019-09-05 12:16:18,929 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 12:16:18" (1/1) ... [2019-09-05 12:16:18,932 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 12:16:18" (1/1) ... [2019-09-05 12:16:18,933 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 12:16:18" (1/1) ... [2019-09-05 12:16:18,936 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 12:16:18" (1/1) ... [2019-09-05 12:16:18,941 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 12:16:18" (1/1) ... [2019-09-05 12:16:18,942 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 12:16:18" (1/1) ... [2019-09-05 12:16:18,943 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-09-05 12:16:18,943 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-09-05 12:16:18,944 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-09-05 12:16:18,944 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-09-05 12:16:18,945 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 12:16:18" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-09-05 12:16:18,997 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-09-05 12:16:18,997 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-09-05 12:16:18,997 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-09-05 12:16:18,998 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-09-05 12:16:18,998 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-09-05 12:16:18,998 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-09-05 12:16:18,998 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-09-05 12:16:18,998 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-09-05 12:16:18,998 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-09-05 12:16:19,177 INFO L278 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-09-05 12:16:19,178 INFO L283 CfgBuilder]: Removed 1 assume(true) statements. [2019-09-05 12:16:19,179 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 05.09 12:16:19 BoogieIcfgContainer [2019-09-05 12:16:19,179 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-09-05 12:16:19,180 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-09-05 12:16:19,180 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-09-05 12:16:19,183 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-09-05 12:16:19,184 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 05.09 12:16:18" (1/3) ... [2019-09-05 12:16:19,184 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@28313cc7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 05.09 12:16:19, skipping insertion in model container [2019-09-05 12:16:19,185 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 12:16:18" (2/3) ... [2019-09-05 12:16:19,185 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@28313cc7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 05.09 12:16:19, skipping insertion in model container [2019-09-05 12:16:19,185 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 05.09 12:16:19" (3/3) ... [2019-09-05 12:16:19,187 INFO L109 eAbstractionObserver]: Analyzing ICFG Mono6_1.c [2019-09-05 12:16:19,195 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-09-05 12:16:19,201 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-09-05 12:16:19,215 INFO L252 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-09-05 12:16:19,242 INFO L128 ementStrategyFactory]: Using default assertion order modulation [2019-09-05 12:16:19,243 INFO L377 AbstractCegarLoop]: Interprodecural is true [2019-09-05 12:16:19,243 INFO L378 AbstractCegarLoop]: Hoare is true [2019-09-05 12:16:19,243 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-09-05 12:16:19,243 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-09-05 12:16:19,243 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-09-05 12:16:19,243 INFO L382 AbstractCegarLoop]: Difference is false [2019-09-05 12:16:19,244 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-09-05 12:16:19,244 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-09-05 12:16:19,259 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2019-09-05 12:16:19,263 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2019-09-05 12:16:19,264 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 12:16:19,264 INFO L399 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 12:16:19,266 INFO L418 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 12:16:19,270 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 12:16:19,270 INFO L82 PathProgramCache]: Analyzing trace with hash -147882559, now seen corresponding path program 1 times [2019-09-05 12:16:19,272 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 12:16:19,272 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 12:16:19,317 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 12:16:19,317 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 12:16:19,317 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 12:16:19,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 12:16:19,392 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 12:16:19,394 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-09-05 12:16:19,394 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2019-09-05 12:16:19,397 INFO L454 AbstractCegarLoop]: Interpolant automaton has 2 states [2019-09-05 12:16:19,407 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2019-09-05 12:16:19,408 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-09-05 12:16:19,409 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 2 states. [2019-09-05 12:16:19,428 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 12:16:19,428 INFO L93 Difference]: Finished difference Result 32 states and 36 transitions. [2019-09-05 12:16:19,428 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2019-09-05 12:16:19,429 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2019-09-05 12:16:19,430 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 12:16:19,436 INFO L225 Difference]: With dead ends: 32 [2019-09-05 12:16:19,436 INFO L226 Difference]: Without dead ends: 13 [2019-09-05 12:16:19,439 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-09-05 12:16:19,456 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2019-09-05 12:16:19,471 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2019-09-05 12:16:19,472 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2019-09-05 12:16:19,473 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2019-09-05 12:16:19,475 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 10 [2019-09-05 12:16:19,475 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 12:16:19,475 INFO L475 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2019-09-05 12:16:19,475 INFO L476 AbstractCegarLoop]: Interpolant automaton has 2 states. [2019-09-05 12:16:19,476 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2019-09-05 12:16:19,476 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2019-09-05 12:16:19,476 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 12:16:19,477 INFO L399 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 12:16:19,477 INFO L418 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 12:16:19,477 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 12:16:19,478 INFO L82 PathProgramCache]: Analyzing trace with hash -158041290, now seen corresponding path program 1 times [2019-09-05 12:16:19,478 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 12:16:19,478 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 12:16:19,479 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 12:16:19,479 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 12:16:19,479 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 12:16:19,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 12:16:19,627 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 12:16:19,628 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-09-05 12:16:19,628 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-09-05 12:16:19,630 INFO L454 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-09-05 12:16:19,631 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-09-05 12:16:19,631 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-09-05 12:16:19,632 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand 3 states. [2019-09-05 12:16:19,679 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 12:16:19,679 INFO L93 Difference]: Finished difference Result 21 states and 23 transitions. [2019-09-05 12:16:19,680 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-09-05 12:16:19,680 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2019-09-05 12:16:19,681 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 12:16:19,682 INFO L225 Difference]: With dead ends: 21 [2019-09-05 12:16:19,682 INFO L226 Difference]: Without dead ends: 16 [2019-09-05 12:16:19,683 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-09-05 12:16:19,684 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2019-09-05 12:16:19,689 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 14. [2019-09-05 12:16:19,689 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2019-09-05 12:16:19,690 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2019-09-05 12:16:19,690 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 10 [2019-09-05 12:16:19,690 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 12:16:19,695 INFO L475 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2019-09-05 12:16:19,696 INFO L476 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-09-05 12:16:19,696 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2019-09-05 12:16:19,696 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2019-09-05 12:16:19,696 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 12:16:19,697 INFO L399 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 12:16:19,697 INFO L418 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 12:16:19,697 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 12:16:19,697 INFO L82 PathProgramCache]: Analyzing trace with hash 743821333, now seen corresponding path program 1 times [2019-09-05 12:16:19,698 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 12:16:19,698 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 12:16:19,701 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 12:16:19,701 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 12:16:19,701 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 12:16:19,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 12:16:19,823 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 12:16:19,823 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-09-05 12:16:19,823 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-09-05 12:16:19,824 INFO L454 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-09-05 12:16:19,826 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-09-05 12:16:19,827 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-09-05 12:16:19,827 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand 3 states. [2019-09-05 12:16:19,860 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 12:16:19,860 INFO L93 Difference]: Finished difference Result 24 states and 27 transitions. [2019-09-05 12:16:19,862 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-09-05 12:16:19,862 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 13 [2019-09-05 12:16:19,862 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 12:16:19,863 INFO L225 Difference]: With dead ends: 24 [2019-09-05 12:16:19,863 INFO L226 Difference]: Without dead ends: 16 [2019-09-05 12:16:19,864 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 2 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-09-05 12:16:19,864 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2019-09-05 12:16:19,870 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2019-09-05 12:16:19,870 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2019-09-05 12:16:19,871 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2019-09-05 12:16:19,872 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 13 [2019-09-05 12:16:19,873 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 12:16:19,873 INFO L475 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2019-09-05 12:16:19,873 INFO L476 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-09-05 12:16:19,874 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2019-09-05 12:16:19,874 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2019-09-05 12:16:19,875 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 12:16:19,875 INFO L399 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 12:16:19,875 INFO L418 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 12:16:19,875 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 12:16:19,876 INFO L82 PathProgramCache]: Analyzing trace with hash -1776138601, now seen corresponding path program 1 times [2019-09-05 12:16:19,876 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 12:16:19,876 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 12:16:19,877 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 12:16:19,877 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 12:16:19,877 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 12:16:19,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 12:16:20,054 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 12:16:20,055 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 12:16:20,058 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) [2019-09-05 12:16:20,084 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 12:16:20,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 12:16:20,111 INFO L256 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 7 conjunts are in the unsatisfiable core [2019-09-05 12:16:20,120 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 12:16:20,167 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 12:16:20,172 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-05 12:16:20,172 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 7 [2019-09-05 12:16:20,173 INFO L454 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-09-05 12:16:20,173 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-09-05 12:16:20,174 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-09-05 12:16:20,174 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand 7 states. [2019-09-05 12:16:20,225 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 12:16:20,226 INFO L93 Difference]: Finished difference Result 27 states and 31 transitions. [2019-09-05 12:16:20,226 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-09-05 12:16:20,227 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 13 [2019-09-05 12:16:20,227 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 12:16:20,227 INFO L225 Difference]: With dead ends: 27 [2019-09-05 12:16:20,227 INFO L226 Difference]: Without dead ends: 19 [2019-09-05 12:16:20,228 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-09-05 12:16:20,228 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2019-09-05 12:16:20,232 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 18. [2019-09-05 12:16:20,232 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2019-09-05 12:16:20,233 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2019-09-05 12:16:20,233 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2019-09-05 12:16:20,233 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 12:16:20,233 INFO L475 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2019-09-05 12:16:20,233 INFO L476 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-09-05 12:16:20,234 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2019-09-05 12:16:20,234 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-09-05 12:16:20,234 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 12:16:20,234 INFO L399 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 12:16:20,235 INFO L418 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 12:16:20,235 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 12:16:20,235 INFO L82 PathProgramCache]: Analyzing trace with hash 199799702, now seen corresponding path program 2 times [2019-09-05 12:16:20,235 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 12:16:20,236 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 12:16:20,236 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 12:16:20,237 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 12:16:20,237 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 12:16:20,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 12:16:20,424 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 12:16:20,424 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 12:16:20,425 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) [2019-09-05 12:16:20,439 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 12:16:20,455 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2019-09-05 12:16:20,455 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 12:16:20,456 INFO L256 TraceCheckSpWp]: Trace formula consists of 26 conjuncts, 11 conjunts are in the unsatisfiable core [2019-09-05 12:16:20,459 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 12:16:20,519 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-05 12:16:20,563 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2019-09-05 12:16:20,567 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2019-09-05 12:16:20,567 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [6] imperfect sequences [6] total 10 [2019-09-05 12:16:20,568 INFO L454 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-09-05 12:16:20,568 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-09-05 12:16:20,569 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=71, Unknown=0, NotChecked=0, Total=90 [2019-09-05 12:16:20,569 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 10 states. [2019-09-05 12:16:20,793 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 12:16:20,794 INFO L93 Difference]: Finished difference Result 36 states and 42 transitions. [2019-09-05 12:16:20,794 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-09-05 12:16:20,794 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 16 [2019-09-05 12:16:20,795 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 12:16:20,795 INFO L225 Difference]: With dead ends: 36 [2019-09-05 12:16:20,795 INFO L226 Difference]: Without dead ends: 25 [2019-09-05 12:16:20,796 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 13 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=44, Invalid=166, Unknown=0, NotChecked=0, Total=210 [2019-09-05 12:16:20,797 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2019-09-05 12:16:20,801 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 24. [2019-09-05 12:16:20,801 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2019-09-05 12:16:20,802 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2019-09-05 12:16:20,802 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 16 [2019-09-05 12:16:20,802 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 12:16:20,802 INFO L475 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2019-09-05 12:16:20,803 INFO L476 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-09-05 12:16:20,803 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2019-09-05 12:16:20,803 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2019-09-05 12:16:20,804 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 12:16:20,804 INFO L399 BasicCegarLoop]: trace histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 12:16:20,804 INFO L418 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 12:16:20,804 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 12:16:20,805 INFO L82 PathProgramCache]: Analyzing trace with hash -1682133644, now seen corresponding path program 1 times [2019-09-05 12:16:20,805 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 12:16:20,805 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 12:16:20,806 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 12:16:20,806 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 12:16:20,806 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 12:16:20,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 12:16:20,943 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 7 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 12:16:20,943 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 12:16:20,943 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) [2019-09-05 12:16:20,956 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 12:16:20,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 12:16:20,967 INFO L256 TraceCheckSpWp]: Trace formula consists of 44 conjuncts, 9 conjunts are in the unsatisfiable core [2019-09-05 12:16:20,969 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 12:16:21,006 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 7 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [MP z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (4)] Exception during sending of exit command (exit): Broken pipe [2019-09-05 12:16:21,010 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-05 12:16:21,011 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 7 [2019-09-05 12:16:21,011 INFO L454 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-09-05 12:16:21,011 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-09-05 12:16:21,012 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2019-09-05 12:16:21,012 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand 7 states. [2019-09-05 12:16:21,080 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 12:16:21,081 INFO L93 Difference]: Finished difference Result 36 states and 40 transitions. [2019-09-05 12:16:21,081 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-09-05 12:16:21,081 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 22 [2019-09-05 12:16:21,082 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 12:16:21,082 INFO L225 Difference]: With dead ends: 36 [2019-09-05 12:16:21,082 INFO L226 Difference]: Without dead ends: 28 [2019-09-05 12:16:21,083 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 21 SyntacticMatches, 3 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2019-09-05 12:16:21,083 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2019-09-05 12:16:21,087 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2019-09-05 12:16:21,087 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2019-09-05 12:16:21,088 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 29 transitions. [2019-09-05 12:16:21,088 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 29 transitions. Word has length 22 [2019-09-05 12:16:21,088 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 12:16:21,089 INFO L475 AbstractCegarLoop]: Abstraction has 27 states and 29 transitions. [2019-09-05 12:16:21,089 INFO L476 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-09-05 12:16:21,089 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 29 transitions. [2019-09-05 12:16:21,089 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2019-09-05 12:16:21,090 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 12:16:21,090 INFO L399 BasicCegarLoop]: trace histogram [5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 12:16:21,090 INFO L418 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 12:16:21,090 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 12:16:21,090 INFO L82 PathProgramCache]: Analyzing trace with hash -1785237675, now seen corresponding path program 2 times [2019-09-05 12:16:21,091 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 12:16:21,091 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 12:16:21,092 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 12:16:21,092 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 12:16:21,092 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 12:16:21,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 12:16:21,231 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 9 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 12:16:21,231 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 12:16:21,231 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) [2019-09-05 12:16:21,244 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 12:16:21,257 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-09-05 12:16:21,258 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 12:16:21,258 INFO L256 TraceCheckSpWp]: Trace formula consists of 48 conjuncts, 11 conjunts are in the unsatisfiable core [2019-09-05 12:16:21,260 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 12:16:21,283 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 9 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 12:16:21,287 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-05 12:16:21,287 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 8 [2019-09-05 12:16:21,288 INFO L454 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-09-05 12:16:21,288 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-09-05 12:16:21,288 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2019-09-05 12:16:21,289 INFO L87 Difference]: Start difference. First operand 27 states and 29 transitions. Second operand 8 states. [2019-09-05 12:16:21,385 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 12:16:21,386 INFO L93 Difference]: Finished difference Result 39 states and 43 transitions. [2019-09-05 12:16:21,386 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-09-05 12:16:21,386 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 25 [2019-09-05 12:16:21,387 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 12:16:21,387 INFO L225 Difference]: With dead ends: 39 [2019-09-05 12:16:21,387 INFO L226 Difference]: Without dead ends: 31 [2019-09-05 12:16:21,390 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 24 SyntacticMatches, 3 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2019-09-05 12:16:21,390 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2019-09-05 12:16:21,397 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 30. [2019-09-05 12:16:21,398 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2019-09-05 12:16:21,399 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2019-09-05 12:16:21,400 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 25 [2019-09-05 12:16:21,400 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 12:16:21,400 INFO L475 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2019-09-05 12:16:21,401 INFO L476 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-09-05 12:16:21,401 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2019-09-05 12:16:21,401 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2019-09-05 12:16:21,402 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 12:16:21,402 INFO L399 BasicCegarLoop]: trace histogram [6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 12:16:21,402 INFO L418 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 12:16:21,402 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 12:16:21,402 INFO L82 PathProgramCache]: Analyzing trace with hash 1839158740, now seen corresponding path program 3 times [2019-09-05 12:16:21,403 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 12:16:21,403 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 12:16:21,404 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 12:16:21,404 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 12:16:21,404 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 12:16:21,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 12:16:21,528 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 11 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 12:16:21,528 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 12:16:21,528 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) [2019-09-05 12:16:21,550 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 12:16:21,565 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2019-09-05 12:16:21,565 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 12:16:21,566 INFO L256 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 13 conjunts are in the unsatisfiable core [2019-09-05 12:16:21,568 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 12:16:21,618 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-05 12:16:21,654 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2019-09-05 12:16:21,658 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-05 12:16:21,658 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 13 [2019-09-05 12:16:21,659 INFO L454 AbstractCegarLoop]: Interpolant automaton has 13 states [2019-09-05 12:16:21,660 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2019-09-05 12:16:21,660 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=128, Unknown=0, NotChecked=0, Total=156 [2019-09-05 12:16:21,660 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand 13 states. [2019-09-05 12:16:22,009 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 12:16:22,009 INFO L93 Difference]: Finished difference Result 48 states and 54 transitions. [2019-09-05 12:16:22,011 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2019-09-05 12:16:22,011 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 28 [2019-09-05 12:16:22,011 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 12:16:22,012 INFO L225 Difference]: With dead ends: 48 [2019-09-05 12:16:22,012 INFO L226 Difference]: Without dead ends: 37 [2019-09-05 12:16:22,013 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 24 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=70, Invalid=350, Unknown=0, NotChecked=0, Total=420 [2019-09-05 12:16:22,013 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2019-09-05 12:16:22,019 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 36. [2019-09-05 12:16:22,019 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2019-09-05 12:16:22,021 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 39 transitions. [2019-09-05 12:16:22,021 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 39 transitions. Word has length 28 [2019-09-05 12:16:22,022 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 12:16:22,022 INFO L475 AbstractCegarLoop]: Abstraction has 36 states and 39 transitions. [2019-09-05 12:16:22,022 INFO L476 AbstractCegarLoop]: Interpolant automaton has 13 states. [2019-09-05 12:16:22,022 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 39 transitions. [2019-09-05 12:16:22,023 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2019-09-05 12:16:22,023 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 12:16:22,023 INFO L399 BasicCegarLoop]: trace histogram [8, 8, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 12:16:22,024 INFO L418 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 12:16:22,024 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 12:16:22,024 INFO L82 PathProgramCache]: Analyzing trace with hash -760785930, now seen corresponding path program 4 times [2019-09-05 12:16:22,024 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 12:16:22,024 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 12:16:22,025 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 12:16:22,025 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 12:16:22,025 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 12:16:22,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 12:16:22,179 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 33 proven. 57 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-09-05 12:16:22,180 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 12:16:22,180 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 12:16:22,205 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-09-05 12:16:22,221 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-09-05 12:16:22,221 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 12:16:22,222 INFO L256 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 15 conjunts are in the unsatisfiable core [2019-09-05 12:16:22,224 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 12:16:22,251 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 33 proven. 57 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-09-05 12:16:22,255 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-05 12:16:22,255 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 10 [2019-09-05 12:16:22,255 INFO L454 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-09-05 12:16:22,256 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-09-05 12:16:22,256 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2019-09-05 12:16:22,256 INFO L87 Difference]: Start difference. First operand 36 states and 39 transitions. Second operand 10 states. [2019-09-05 12:16:22,398 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 12:16:22,398 INFO L93 Difference]: Finished difference Result 51 states and 57 transitions. [2019-09-05 12:16:22,398 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-09-05 12:16:22,399 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 34 [2019-09-05 12:16:22,399 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 12:16:22,400 INFO L225 Difference]: With dead ends: 51 [2019-09-05 12:16:22,400 INFO L226 Difference]: Without dead ends: 40 [2019-09-05 12:16:22,400 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 33 SyntacticMatches, 3 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2019-09-05 12:16:22,401 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2019-09-05 12:16:22,405 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2019-09-05 12:16:22,405 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2019-09-05 12:16:22,406 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 42 transitions. [2019-09-05 12:16:22,406 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 42 transitions. Word has length 34 [2019-09-05 12:16:22,406 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 12:16:22,406 INFO L475 AbstractCegarLoop]: Abstraction has 39 states and 42 transitions. [2019-09-05 12:16:22,407 INFO L476 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-09-05 12:16:22,407 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 42 transitions. [2019-09-05 12:16:22,408 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2019-09-05 12:16:22,408 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 12:16:22,408 INFO L399 BasicCegarLoop]: trace histogram [9, 9, 7, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 12:16:22,408 INFO L418 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 12:16:22,408 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 12:16:22,408 INFO L82 PathProgramCache]: Analyzing trace with hash 1049709655, now seen corresponding path program 5 times [2019-09-05 12:16:22,408 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 12:16:22,409 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 12:16:22,409 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 12:16:22,409 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 12:16:22,410 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 12:16:22,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 12:16:22,580 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 38 proven. 77 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-09-05 12:16:22,580 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 12:16:22,580 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 12:16:22,597 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2019-09-05 12:16:22,674 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 10 check-sat command(s) [2019-09-05 12:16:22,675 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 12:16:22,676 INFO L256 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 17 conjunts are in the unsatisfiable core [2019-09-05 12:16:22,677 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 12:16:22,708 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 38 proven. 77 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-09-05 12:16:22,712 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-05 12:16:22,712 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 11 [2019-09-05 12:16:22,713 INFO L454 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-09-05 12:16:22,713 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-09-05 12:16:22,713 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2019-09-05 12:16:22,713 INFO L87 Difference]: Start difference. First operand 39 states and 42 transitions. Second operand 11 states. [2019-09-05 12:16:22,865 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 12:16:22,866 INFO L93 Difference]: Finished difference Result 54 states and 60 transitions. [2019-09-05 12:16:22,866 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-09-05 12:16:22,866 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 37 [2019-09-05 12:16:22,866 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 12:16:22,867 INFO L225 Difference]: With dead ends: 54 [2019-09-05 12:16:22,867 INFO L226 Difference]: Without dead ends: 43 [2019-09-05 12:16:22,868 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 36 SyntacticMatches, 3 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2019-09-05 12:16:22,868 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2019-09-05 12:16:22,872 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 42. [2019-09-05 12:16:22,873 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2019-09-05 12:16:22,873 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 45 transitions. [2019-09-05 12:16:22,874 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 45 transitions. Word has length 37 [2019-09-05 12:16:22,874 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 12:16:22,874 INFO L475 AbstractCegarLoop]: Abstraction has 42 states and 45 transitions. [2019-09-05 12:16:22,874 INFO L476 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-09-05 12:16:22,874 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 45 transitions. [2019-09-05 12:16:22,875 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2019-09-05 12:16:22,875 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 12:16:22,875 INFO L399 BasicCegarLoop]: trace histogram [10, 10, 8, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 12:16:22,876 INFO L418 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 12:16:22,876 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 12:16:22,876 INFO L82 PathProgramCache]: Analyzing trace with hash 1324379222, now seen corresponding path program 6 times [2019-09-05 12:16:22,876 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 12:16:22,876 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 12:16:22,877 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 12:16:22,877 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 12:16:22,877 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 12:16:22,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 12:16:23,039 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 43 proven. 100 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-09-05 12:16:23,040 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 12:16:23,040 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 12:16:23,059 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2019-09-05 12:16:23,097 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2019-09-05 12:16:23,097 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 12:16:23,098 INFO L256 TraceCheckSpWp]: Trace formula consists of 54 conjuncts, 15 conjunts are in the unsatisfiable core [2019-09-05 12:16:23,100 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 12:16:23,189 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-05 12:16:23,224 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2019-09-05 12:16:23,228 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-05 12:16:23,228 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 8] total 17 [2019-09-05 12:16:23,228 INFO L454 AbstractCegarLoop]: Interpolant automaton has 17 states [2019-09-05 12:16:23,229 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2019-09-05 12:16:23,229 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=233, Unknown=0, NotChecked=0, Total=272 [2019-09-05 12:16:23,229 INFO L87 Difference]: Start difference. First operand 42 states and 45 transitions. Second operand 17 states. [2019-09-05 12:16:23,786 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 12:16:23,787 INFO L93 Difference]: Finished difference Result 63 states and 71 transitions. [2019-09-05 12:16:23,787 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-09-05 12:16:23,787 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 40 [2019-09-05 12:16:23,787 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 12:16:23,788 INFO L225 Difference]: With dead ends: 63 [2019-09-05 12:16:23,788 INFO L226 Difference]: Without dead ends: 49 [2019-09-05 12:16:23,789 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 35 SyntacticMatches, 2 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=99, Invalid=657, Unknown=0, NotChecked=0, Total=756 [2019-09-05 12:16:23,789 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2019-09-05 12:16:23,794 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 48. [2019-09-05 12:16:23,794 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2019-09-05 12:16:23,795 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 52 transitions. [2019-09-05 12:16:23,795 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 52 transitions. Word has length 40 [2019-09-05 12:16:23,795 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 12:16:23,795 INFO L475 AbstractCegarLoop]: Abstraction has 48 states and 52 transitions. [2019-09-05 12:16:23,795 INFO L476 AbstractCegarLoop]: Interpolant automaton has 17 states. [2019-09-05 12:16:23,796 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 52 transitions. [2019-09-05 12:16:23,796 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2019-09-05 12:16:23,796 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 12:16:23,797 INFO L399 BasicCegarLoop]: trace histogram [12, 12, 9, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 12:16:23,797 INFO L418 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 12:16:23,797 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 12:16:23,797 INFO L82 PathProgramCache]: Analyzing trace with hash 1062711220, now seen corresponding path program 7 times [2019-09-05 12:16:23,797 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 12:16:23,797 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 12:16:23,798 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 12:16:23,798 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 12:16:23,799 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 12:16:23,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 12:16:23,991 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 53 proven. 155 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-09-05 12:16:23,992 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 12:16:23,992 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 12:16:24,005 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 12:16:24,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 12:16:24,022 INFO L256 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 21 conjunts are in the unsatisfiable core [2019-09-05 12:16:24,023 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 12:16:24,040 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 77 proven. 126 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2019-09-05 12:16:24,043 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-05 12:16:24,044 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 13 [2019-09-05 12:16:24,044 INFO L454 AbstractCegarLoop]: Interpolant automaton has 13 states [2019-09-05 12:16:24,044 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2019-09-05 12:16:24,045 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2019-09-05 12:16:24,045 INFO L87 Difference]: Start difference. First operand 48 states and 52 transitions. Second operand 13 states. [2019-09-05 12:16:24,313 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 12:16:24,314 INFO L93 Difference]: Finished difference Result 69 states and 78 transitions. [2019-09-05 12:16:24,314 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2019-09-05 12:16:24,314 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 46 [2019-09-05 12:16:24,314 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 12:16:24,315 INFO L225 Difference]: With dead ends: 69 [2019-09-05 12:16:24,315 INFO L226 Difference]: Without dead ends: 55 [2019-09-05 12:16:24,316 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 46 SyntacticMatches, 3 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2019-09-05 12:16:24,316 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2019-09-05 12:16:24,321 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 54. [2019-09-05 12:16:24,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2019-09-05 12:16:24,322 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 58 transitions. [2019-09-05 12:16:24,322 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 58 transitions. Word has length 46 [2019-09-05 12:16:24,322 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 12:16:24,322 INFO L475 AbstractCegarLoop]: Abstraction has 54 states and 58 transitions. [2019-09-05 12:16:24,323 INFO L476 AbstractCegarLoop]: Interpolant automaton has 13 states. [2019-09-05 12:16:24,323 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 58 transitions. [2019-09-05 12:16:24,324 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2019-09-05 12:16:24,324 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 12:16:24,324 INFO L399 BasicCegarLoop]: trace histogram [14, 14, 11, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 12:16:24,324 INFO L418 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 12:16:24,324 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 12:16:24,325 INFO L82 PathProgramCache]: Analyzing trace with hash 1340028948, now seen corresponding path program 8 times [2019-09-05 12:16:24,325 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 12:16:24,325 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 12:16:24,325 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 12:16:24,326 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 12:16:24,326 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 12:16:24,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 12:16:24,567 INFO L134 CoverageAnalysis]: Checked inductivity of 287 backedges. 63 proven. 222 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-09-05 12:16:24,568 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 12:16:24,568 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) [2019-09-05 12:16:24,585 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 12:16:24,603 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-09-05 12:16:24,603 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 12:16:24,604 INFO L256 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 25 conjunts are in the unsatisfiable core [2019-09-05 12:16:24,607 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 12:16:24,624 INFO L134 CoverageAnalysis]: Checked inductivity of 287 backedges. 93 proven. 187 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [MP z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (11)] Exception during sending of exit command (exit): Broken pipe [2019-09-05 12:16:24,628 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-05 12:16:24,628 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 15 [2019-09-05 12:16:24,629 INFO L454 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-09-05 12:16:24,629 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-09-05 12:16:24,629 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2019-09-05 12:16:24,630 INFO L87 Difference]: Start difference. First operand 54 states and 58 transitions. Second operand 15 states. [2019-09-05 12:16:24,975 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 12:16:24,975 INFO L93 Difference]: Finished difference Result 75 states and 84 transitions. [2019-09-05 12:16:24,976 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2019-09-05 12:16:24,976 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 52 [2019-09-05 12:16:24,976 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 12:16:24,977 INFO L225 Difference]: With dead ends: 75 [2019-09-05 12:16:24,978 INFO L226 Difference]: Without dead ends: 61 [2019-09-05 12:16:24,978 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 52 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2019-09-05 12:16:24,979 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2019-09-05 12:16:24,984 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 60. [2019-09-05 12:16:24,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2019-09-05 12:16:24,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 64 transitions. [2019-09-05 12:16:24,985 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 64 transitions. Word has length 52 [2019-09-05 12:16:24,985 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 12:16:24,986 INFO L475 AbstractCegarLoop]: Abstraction has 60 states and 64 transitions. [2019-09-05 12:16:24,986 INFO L476 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-09-05 12:16:24,986 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 64 transitions. [2019-09-05 12:16:24,986 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2019-09-05 12:16:24,987 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 12:16:24,987 INFO L399 BasicCegarLoop]: trace histogram [16, 16, 13, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 12:16:24,987 INFO L418 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 12:16:24,987 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 12:16:24,987 INFO L82 PathProgramCache]: Analyzing trace with hash -990447500, now seen corresponding path program 9 times [2019-09-05 12:16:24,987 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 12:16:24,988 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 12:16:24,988 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 12:16:24,988 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 12:16:24,989 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 12:16:25,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 12:16:25,216 INFO L134 CoverageAnalysis]: Checked inductivity of 376 backedges. 73 proven. 301 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-09-05 12:16:25,216 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 12:16:25,216 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 12:16:25,228 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-09-05 12:16:25,276 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2019-09-05 12:16:25,276 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 12:16:25,277 INFO L256 TraceCheckSpWp]: Trace formula consists of 48 conjuncts, 17 conjunts are in the unsatisfiable core [2019-09-05 12:16:25,279 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 12:16:25,466 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-05 12:16:25,543 INFO L134 CoverageAnalysis]: Checked inductivity of 376 backedges. 0 proven. 116 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [MP z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (12)] Exception during sending of exit command (exit): Broken pipe [2019-09-05 12:16:25,547 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-05 12:16:25,547 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 9] total 24 [2019-09-05 12:16:25,548 INFO L454 AbstractCegarLoop]: Interpolant automaton has 24 states [2019-09-05 12:16:25,548 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2019-09-05 12:16:25,548 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=493, Unknown=0, NotChecked=0, Total=552 [2019-09-05 12:16:25,549 INFO L87 Difference]: Start difference. First operand 60 states and 64 transitions. Second operand 24 states. [2019-09-05 12:16:26,736 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 12:16:26,736 INFO L93 Difference]: Finished difference Result 87 states and 98 transitions. [2019-09-05 12:16:26,737 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2019-09-05 12:16:26,737 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 58 [2019-09-05 12:16:26,737 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 12:16:26,738 INFO L225 Difference]: With dead ends: 87 [2019-09-05 12:16:26,738 INFO L226 Difference]: Without dead ends: 70 [2019-09-05 12:16:26,739 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 52 SyntacticMatches, 2 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 143 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=155, Invalid=1485, Unknown=0, NotChecked=0, Total=1640 [2019-09-05 12:16:26,740 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2019-09-05 12:16:26,745 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 69. [2019-09-05 12:16:26,745 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2019-09-05 12:16:26,747 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 74 transitions. [2019-09-05 12:16:26,747 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 74 transitions. Word has length 58 [2019-09-05 12:16:26,747 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 12:16:26,747 INFO L475 AbstractCegarLoop]: Abstraction has 69 states and 74 transitions. [2019-09-05 12:16:26,747 INFO L476 AbstractCegarLoop]: Interpolant automaton has 24 states. [2019-09-05 12:16:26,748 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 74 transitions. [2019-09-05 12:16:26,748 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2019-09-05 12:16:26,748 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 12:16:26,749 INFO L399 BasicCegarLoop]: trace histogram [19, 19, 15, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 12:16:26,749 INFO L418 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 12:16:26,749 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 12:16:26,749 INFO L82 PathProgramCache]: Analyzing trace with hash 1758268855, now seen corresponding path program 10 times [2019-09-05 12:16:26,749 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 12:16:26,750 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 12:16:26,750 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 12:16:26,750 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 12:16:26,751 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 12:16:26,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 12:16:27,072 INFO L134 CoverageAnalysis]: Checked inductivity of 532 backedges. 88 proven. 442 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-09-05 12:16:27,072 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 12:16:27,073 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 12:16:27,086 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-09-05 12:16:27,113 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-09-05 12:16:27,113 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 12:16:27,114 INFO L256 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 33 conjunts are in the unsatisfiable core [2019-09-05 12:16:27,116 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 12:16:27,135 INFO L134 CoverageAnalysis]: Checked inductivity of 532 backedges. 172 proven. 345 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2019-09-05 12:16:27,139 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-05 12:16:27,139 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 18] total 20 [2019-09-05 12:16:27,139 INFO L454 AbstractCegarLoop]: Interpolant automaton has 20 states [2019-09-05 12:16:27,140 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2019-09-05 12:16:27,140 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2019-09-05 12:16:27,140 INFO L87 Difference]: Start difference. First operand 69 states and 74 transitions. Second operand 20 states. [2019-09-05 12:16:27,774 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 12:16:27,775 INFO L93 Difference]: Finished difference Result 96 states and 108 transitions. [2019-09-05 12:16:27,776 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2019-09-05 12:16:27,777 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 67 [2019-09-05 12:16:27,777 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 12:16:27,778 INFO L225 Difference]: With dead ends: 96 [2019-09-05 12:16:27,778 INFO L226 Difference]: Without dead ends: 79 [2019-09-05 12:16:27,778 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 67 SyntacticMatches, 3 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2019-09-05 12:16:27,779 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2019-09-05 12:16:27,790 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 78. [2019-09-05 12:16:27,790 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2019-09-05 12:16:27,794 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 83 transitions. [2019-09-05 12:16:27,794 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 83 transitions. Word has length 67 [2019-09-05 12:16:27,795 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 12:16:27,795 INFO L475 AbstractCegarLoop]: Abstraction has 78 states and 83 transitions. [2019-09-05 12:16:27,795 INFO L476 AbstractCegarLoop]: Interpolant automaton has 20 states. [2019-09-05 12:16:27,795 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 83 transitions. [2019-09-05 12:16:27,796 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2019-09-05 12:16:27,796 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 12:16:27,798 INFO L399 BasicCegarLoop]: trace histogram [22, 22, 18, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 12:16:27,798 INFO L418 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 12:16:27,799 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 12:16:27,799 INFO L82 PathProgramCache]: Analyzing trace with hash -1281897002, now seen corresponding path program 11 times [2019-09-05 12:16:27,799 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 12:16:27,799 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 12:16:27,799 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 12:16:27,800 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 12:16:27,800 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 12:16:27,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 12:16:28,176 INFO L134 CoverageAnalysis]: Checked inductivity of 715 backedges. 103 proven. 610 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-09-05 12:16:28,176 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 12:16:28,176 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 12:16:28,187 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2019-09-05 12:20:35,580 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 23 check-sat command(s) [2019-09-05 12:20:35,581 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 12:20:39,850 INFO L256 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 39 conjunts are in the unsatisfiable core [2019-09-05 12:20:39,851 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 12:20:39,880 INFO L134 CoverageAnalysis]: Checked inductivity of 715 backedges. 205 proven. 495 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2019-09-05 12:20:39,892 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-05 12:20:39,893 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 21] total 23 [2019-09-05 12:20:39,893 INFO L454 AbstractCegarLoop]: Interpolant automaton has 23 states [2019-09-05 12:20:39,894 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2019-09-05 12:20:39,894 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2019-09-05 12:20:39,894 INFO L87 Difference]: Start difference. First operand 78 states and 83 transitions. Second operand 23 states. [2019-09-05 12:20:40,720 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 12:20:40,721 INFO L93 Difference]: Finished difference Result 105 states and 117 transitions. [2019-09-05 12:20:40,721 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2019-09-05 12:20:40,721 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 76 [2019-09-05 12:20:40,722 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 12:20:40,722 INFO L225 Difference]: With dead ends: 105 [2019-09-05 12:20:40,722 INFO L226 Difference]: Without dead ends: 88 [2019-09-05 12:20:40,724 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 76 SyntacticMatches, 3 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2019-09-05 12:20:40,725 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2019-09-05 12:20:40,735 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 87. [2019-09-05 12:20:40,735 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2019-09-05 12:20:40,743 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 92 transitions. [2019-09-05 12:20:40,743 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 92 transitions. Word has length 76 [2019-09-05 12:20:40,743 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 12:20:40,744 INFO L475 AbstractCegarLoop]: Abstraction has 87 states and 92 transitions. [2019-09-05 12:20:40,744 INFO L476 AbstractCegarLoop]: Interpolant automaton has 23 states. [2019-09-05 12:20:40,744 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 92 transitions. [2019-09-05 12:20:40,747 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2019-09-05 12:20:40,747 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 12:20:40,748 INFO L399 BasicCegarLoop]: trace histogram [25, 25, 21, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 12:20:40,748 INFO L418 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 12:20:40,748 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 12:20:40,748 INFO L82 PathProgramCache]: Analyzing trace with hash -1781940073, now seen corresponding path program 12 times [2019-09-05 12:20:40,748 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 12:20:40,749 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 12:20:40,752 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 12:20:40,753 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 12:20:40,753 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 12:20:40,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 12:20:41,271 INFO L134 CoverageAnalysis]: Checked inductivity of 925 backedges. 118 proven. 805 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-09-05 12:20:41,271 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 12:20:41,272 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 12:20:41,283 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2019-09-05 12:22:00,344 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2019-09-05 12:22:00,344 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 12:22:00,838 INFO L256 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 25 conjunts are in the unsatisfiable core [2019-09-05 12:22:00,840 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 12:22:01,240 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-05 12:22:01,312 INFO L134 CoverageAnalysis]: Checked inductivity of 925 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 672 trivial. 0 not checked. [2019-09-05 12:22:01,317 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-05 12:22:01,317 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 13] total 37 [2019-09-05 12:22:01,318 INFO L454 AbstractCegarLoop]: Interpolant automaton has 37 states [2019-09-05 12:22:01,318 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2019-09-05 12:22:01,319 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=1237, Unknown=0, NotChecked=0, Total=1332 [2019-09-05 12:22:01,319 INFO L87 Difference]: Start difference. First operand 87 states and 92 transitions. Second operand 37 states. [2019-09-05 12:22:04,457 WARN L188 SmtUtils]: Spent 666.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 18 [2019-09-05 12:22:05,003 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 12:22:05,004 INFO L93 Difference]: Finished difference Result 121 states and 135 transitions. [2019-09-05 12:22:05,004 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2019-09-05 12:22:05,004 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 85 [2019-09-05 12:22:05,004 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 12:22:05,005 INFO L225 Difference]: With dead ends: 121 [2019-09-05 12:22:05,005 INFO L226 Difference]: Without dead ends: 101 [2019-09-05 12:22:05,008 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 75 SyntacticMatches, 2 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 424 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=253, Invalid=3907, Unknown=0, NotChecked=0, Total=4160 [2019-09-05 12:22:05,008 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2019-09-05 12:22:05,013 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 99. [2019-09-05 12:22:05,013 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2019-09-05 12:22:05,014 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 103 transitions. [2019-09-05 12:22:05,015 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 103 transitions. Word has length 85 [2019-09-05 12:22:05,015 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 12:22:05,015 INFO L475 AbstractCegarLoop]: Abstraction has 99 states and 103 transitions. [2019-09-05 12:22:05,015 INFO L476 AbstractCegarLoop]: Interpolant automaton has 37 states. [2019-09-05 12:22:05,015 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 103 transitions. [2019-09-05 12:22:05,016 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2019-09-05 12:22:05,017 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 12:22:05,017 INFO L399 BasicCegarLoop]: trace histogram [29, 29, 24, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 12:22:05,017 INFO L418 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 12:22:05,017 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 12:22:05,017 INFO L82 PathProgramCache]: Analyzing trace with hash 841571413, now seen corresponding path program 13 times [2019-09-05 12:22:05,018 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 12:22:05,018 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 12:22:05,018 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 12:22:05,019 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 12:22:05,019 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 12:22:05,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 12:22:05,561 INFO L134 CoverageAnalysis]: Checked inductivity of 1247 backedges. 138 proven. 1107 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-09-05 12:22:05,562 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 12:22:05,562 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 12:22:05,577 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 12:22:05,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 12:22:05,605 INFO L256 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 51 conjunts are in the unsatisfiable core [2019-09-05 12:22:05,606 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 12:22:05,632 INFO L134 CoverageAnalysis]: Checked inductivity of 1247 backedges. 345 proven. 876 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2019-09-05 12:22:05,635 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-05 12:22:05,635 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 27] total 30 [2019-09-05 12:22:05,636 INFO L454 AbstractCegarLoop]: Interpolant automaton has 30 states [2019-09-05 12:22:05,636 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2019-09-05 12:22:05,636 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=786, Unknown=0, NotChecked=0, Total=870 [2019-09-05 12:22:05,637 INFO L87 Difference]: Start difference. First operand 99 states and 103 transitions. Second operand 30 states. [2019-09-05 12:22:07,122 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 12:22:07,122 INFO L93 Difference]: Finished difference Result 132 states and 143 transitions. [2019-09-05 12:22:07,123 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2019-09-05 12:22:07,123 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 97 [2019-09-05 12:22:07,123 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 12:22:07,124 INFO L225 Difference]: With dead ends: 132 [2019-09-05 12:22:07,124 INFO L226 Difference]: Without dead ends: 112 [2019-09-05 12:22:07,125 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 97 SyntacticMatches, 3 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=84, Invalid=786, Unknown=0, NotChecked=0, Total=870 [2019-09-05 12:22:07,126 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2019-09-05 12:22:07,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 111. [2019-09-05 12:22:07,131 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 111 states. [2019-09-05 12:22:07,132 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 115 transitions. [2019-09-05 12:22:07,132 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 115 transitions. Word has length 97 [2019-09-05 12:22:07,133 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 12:22:07,133 INFO L475 AbstractCegarLoop]: Abstraction has 111 states and 115 transitions. [2019-09-05 12:22:07,133 INFO L476 AbstractCegarLoop]: Interpolant automaton has 30 states. [2019-09-05 12:22:07,133 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 115 transitions. [2019-09-05 12:22:07,134 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2019-09-05 12:22:07,134 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 12:22:07,134 INFO L399 BasicCegarLoop]: trace histogram [33, 33, 28, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 12:22:07,135 INFO L418 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 12:22:07,135 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 12:22:07,135 INFO L82 PathProgramCache]: Analyzing trace with hash -1140270187, now seen corresponding path program 14 times [2019-09-05 12:22:07,135 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 12:22:07,135 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 12:22:07,136 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 12:22:07,136 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 12:22:07,136 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 12:22:07,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 12:22:07,857 INFO L134 CoverageAnalysis]: Checked inductivity of 1617 backedges. 158 proven. 1457 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-09-05 12:22:07,858 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 12:22:07,858 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 12:22:07,868 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2019-09-05 12:22:07,896 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-09-05 12:22:07,896 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 12:22:07,898 INFO L256 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 59 conjunts are in the unsatisfiable core [2019-09-05 12:22:07,899 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 12:22:07,931 INFO L134 CoverageAnalysis]: Checked inductivity of 1617 backedges. 401 proven. 1190 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2019-09-05 12:22:07,934 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-05 12:22:07,934 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 31] total 34 [2019-09-05 12:22:07,935 INFO L454 AbstractCegarLoop]: Interpolant automaton has 34 states [2019-09-05 12:22:07,935 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2019-09-05 12:22:07,936 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=1026, Unknown=0, NotChecked=0, Total=1122 [2019-09-05 12:22:07,936 INFO L87 Difference]: Start difference. First operand 111 states and 115 transitions. Second operand 34 states. [2019-09-05 12:22:09,895 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 12:22:09,896 INFO L93 Difference]: Finished difference Result 144 states and 155 transitions. [2019-09-05 12:22:09,896 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2019-09-05 12:22:09,896 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 109 [2019-09-05 12:22:09,897 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 12:22:09,898 INFO L225 Difference]: With dead ends: 144 [2019-09-05 12:22:09,898 INFO L226 Difference]: Without dead ends: 124 [2019-09-05 12:22:09,899 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 109 SyntacticMatches, 3 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=96, Invalid=1026, Unknown=0, NotChecked=0, Total=1122 [2019-09-05 12:22:09,899 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2019-09-05 12:22:09,905 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 123. [2019-09-05 12:22:09,905 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 123 states. [2019-09-05 12:22:09,906 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 127 transitions. [2019-09-05 12:22:09,906 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 127 transitions. Word has length 109 [2019-09-05 12:22:09,907 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 12:22:09,907 INFO L475 AbstractCegarLoop]: Abstraction has 123 states and 127 transitions. [2019-09-05 12:22:09,907 INFO L476 AbstractCegarLoop]: Interpolant automaton has 34 states. [2019-09-05 12:22:09,907 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 127 transitions. [2019-09-05 12:22:09,908 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2019-09-05 12:22:09,908 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 12:22:09,909 INFO L399 BasicCegarLoop]: trace histogram [37, 37, 32, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 12:22:09,909 INFO L418 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 12:22:09,909 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 12:22:09,909 INFO L82 PathProgramCache]: Analyzing trace with hash 274954965, now seen corresponding path program 15 times [2019-09-05 12:22:09,909 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 12:22:09,910 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 12:22:09,910 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 12:22:09,910 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 12:22:09,911 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 12:22:09,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 12:22:10,797 INFO L134 CoverageAnalysis]: Checked inductivity of 2035 backedges. 178 proven. 1855 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-09-05 12:22:10,797 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 12:22:10,797 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 12:22:10,808 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-09-05 12:22:11,329 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2019-09-05 12:22:11,329 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 12:22:11,333 INFO L256 TraceCheckSpWp]: Trace formula consists of 64 conjuncts, 27 conjunts are in the unsatisfiable core [2019-09-05 12:22:11,335 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 12:22:11,925 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-05 12:22:12,032 INFO L134 CoverageAnalysis]: Checked inductivity of 2035 backedges. 0 proven. 483 refuted. 0 times theorem prover too weak. 1552 trivial. 0 not checked. [2019-09-05 12:22:12,036 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-05 12:22:12,036 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 14] total 50 [2019-09-05 12:22:12,037 INFO L454 AbstractCegarLoop]: Interpolant automaton has 50 states [2019-09-05 12:22:12,037 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2019-09-05 12:22:12,038 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=133, Invalid=2317, Unknown=0, NotChecked=0, Total=2450 [2019-09-05 12:22:12,038 INFO L87 Difference]: Start difference. First operand 123 states and 127 transitions. Second operand 50 states. [2019-09-05 12:22:16,814 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 12:22:16,815 INFO L93 Difference]: Finished difference Result 162 states and 175 transitions. [2019-09-05 12:22:16,815 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2019-09-05 12:22:16,815 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 121 [2019-09-05 12:22:16,815 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 12:22:16,817 INFO L225 Difference]: With dead ends: 162 [2019-09-05 12:22:16,817 INFO L226 Difference]: Without dead ends: 139 [2019-09-05 12:22:16,820 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 200 GetRequests, 110 SyntacticMatches, 2 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 839 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=363, Invalid=7647, Unknown=0, NotChecked=0, Total=8010 [2019-09-05 12:22:16,821 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2019-09-05 12:22:16,825 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 138. [2019-09-05 12:22:16,825 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 138 states. [2019-09-05 12:22:16,826 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 142 transitions. [2019-09-05 12:22:16,826 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 142 transitions. Word has length 121 [2019-09-05 12:22:16,826 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 12:22:16,827 INFO L475 AbstractCegarLoop]: Abstraction has 138 states and 142 transitions. [2019-09-05 12:22:16,827 INFO L476 AbstractCegarLoop]: Interpolant automaton has 50 states. [2019-09-05 12:22:16,827 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 142 transitions. [2019-09-05 12:22:16,828 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2019-09-05 12:22:16,828 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 12:22:16,828 INFO L399 BasicCegarLoop]: trace histogram [42, 42, 36, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 12:22:16,828 INFO L418 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 12:22:16,828 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 12:22:16,828 INFO L82 PathProgramCache]: Analyzing trace with hash -1247432490, now seen corresponding path program 16 times [2019-09-05 12:22:16,829 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 12:22:16,829 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 12:22:16,829 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 12:22:16,830 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 12:22:16,830 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 12:22:16,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 12:22:18,072 INFO L134 CoverageAnalysis]: Checked inductivity of 2625 backedges. 203 proven. 2420 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-09-05 12:22:18,072 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 12:22:18,073 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 12:22:18,100 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-09-05 12:22:18,160 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-09-05 12:22:18,160 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 12:22:18,162 INFO L256 TraceCheckSpWp]: Trace formula consists of 206 conjuncts, 85 conjunts are in the unsatisfiable core [2019-09-05 12:22:18,165 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 12:22:18,406 INFO L134 CoverageAnalysis]: Checked inductivity of 2625 backedges. 83 proven. 2542 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 12:22:18,419 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-05 12:22:18,419 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 44] total 45 [2019-09-05 12:22:18,420 INFO L454 AbstractCegarLoop]: Interpolant automaton has 45 states [2019-09-05 12:22:18,420 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2019-09-05 12:22:18,421 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=1852, Unknown=0, NotChecked=0, Total=1980 [2019-09-05 12:22:18,422 INFO L87 Difference]: Start difference. First operand 138 states and 142 transitions. Second operand 45 states. [2019-09-05 12:22:21,786 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 12:22:21,786 INFO L93 Difference]: Finished difference Result 180 states and 193 transitions. [2019-09-05 12:22:21,787 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2019-09-05 12:22:21,787 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 136 [2019-09-05 12:22:21,787 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 12:22:21,789 INFO L225 Difference]: With dead ends: 180 [2019-09-05 12:22:21,789 INFO L226 Difference]: Without dead ends: 157 [2019-09-05 12:22:21,790 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 180 GetRequests, 134 SyntacticMatches, 3 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=128, Invalid=1852, Unknown=0, NotChecked=0, Total=1980 [2019-09-05 12:22:21,790 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2019-09-05 12:22:21,795 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 156. [2019-09-05 12:22:21,795 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 156 states. [2019-09-05 12:22:21,796 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 160 transitions. [2019-09-05 12:22:21,796 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 160 transitions. Word has length 136 [2019-09-05 12:22:21,797 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 12:22:21,797 INFO L475 AbstractCegarLoop]: Abstraction has 156 states and 160 transitions. [2019-09-05 12:22:21,797 INFO L476 AbstractCegarLoop]: Interpolant automaton has 45 states. [2019-09-05 12:22:21,797 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 160 transitions. [2019-09-05 12:22:21,798 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 155 [2019-09-05 12:22:21,798 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 12:22:21,798 INFO L399 BasicCegarLoop]: trace histogram [48, 48, 42, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 12:22:21,798 INFO L418 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 12:22:21,799 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 12:22:21,799 INFO L82 PathProgramCache]: Analyzing trace with hash -307443210, now seen corresponding path program 17 times [2019-09-05 12:22:21,799 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 12:22:21,799 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 12:22:21,807 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 12:22:21,807 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 12:22:21,807 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 12:22:21,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 12:22:23,122 INFO L134 CoverageAnalysis]: Checked inductivity of 3432 backedges. 233 proven. 3197 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-09-05 12:22:23,122 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 12:22:23,122 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) [2019-09-05 12:22:23,144 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000