java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/functions_1-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-0883e75 [2019-09-05 11:43:37,493 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-09-05 11:43:37,496 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-09-05 11:43:37,515 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-09-05 11:43:37,515 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-09-05 11:43:37,517 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-09-05 11:43:37,519 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-09-05 11:43:37,522 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-09-05 11:43:37,524 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-09-05 11:43:37,525 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-09-05 11:43:37,526 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-09-05 11:43:37,527 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-09-05 11:43:37,527 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-09-05 11:43:37,528 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-09-05 11:43:37,529 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-09-05 11:43:37,530 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-09-05 11:43:37,531 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-09-05 11:43:37,532 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-09-05 11:43:37,534 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-09-05 11:43:37,536 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-09-05 11:43:37,537 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-09-05 11:43:37,539 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-09-05 11:43:37,540 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-09-05 11:43:37,541 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-09-05 11:43:37,543 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-09-05 11:43:37,554 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-09-05 11:43:37,555 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-09-05 11:43:37,555 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-09-05 11:43:37,556 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 11:43:37,589 INFO L113 SettingsManager]: Loading preferences was successful [2019-09-05 11:43:37,589 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-09-05 11:43:37,592 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-09-05 11:43:37,593 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-09-05 11:43:37,593 INFO L138 SettingsManager]: * Use SBE=true [2019-09-05 11:43:37,593 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-09-05 11:43:37,594 INFO L138 SettingsManager]: * sizeof long=4 [2019-09-05 11:43:37,594 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-09-05 11:43:37,594 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-09-05 11:43:37,594 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-09-05 11:43:37,595 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-09-05 11:43:37,596 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-09-05 11:43:37,596 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-09-05 11:43:37,596 INFO L138 SettingsManager]: * sizeof long double=12 [2019-09-05 11:43:37,596 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-09-05 11:43:37,597 INFO L138 SettingsManager]: * Use constant arrays=true [2019-09-05 11:43:37,597 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-09-05 11:43:37,597 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-09-05 11:43:37,597 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-09-05 11:43:37,598 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-09-05 11:43:37,598 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-09-05 11:43:37,598 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-09-05 11:43:37,599 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-09-05 11:43:37,599 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-09-05 11:43:37,600 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-09-05 11:43:37,600 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-09-05 11:43:37,600 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-09-05 11:43:37,600 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-09-05 11:43:37,600 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-09-05 11:43:37,654 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-09-05 11:43:37,667 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-09-05 11:43:37,671 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-09-05 11:43:37,672 INFO L271 PluginConnector]: Initializing CDTParser... [2019-09-05 11:43:37,673 INFO L275 PluginConnector]: CDTParser initialized [2019-09-05 11:43:37,674 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/functions_1-1.c [2019-09-05 11:43:37,735 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f7ca0759a/a1be7e68b29b494c8bdbb373bf87377b/FLAGea0fb2d8b [2019-09-05 11:43:38,155 INFO L306 CDTParser]: Found 1 translation units. [2019-09-05 11:43:38,157 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/functions_1-1.c [2019-09-05 11:43:38,163 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f7ca0759a/a1be7e68b29b494c8bdbb373bf87377b/FLAGea0fb2d8b [2019-09-05 11:43:38,550 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f7ca0759a/a1be7e68b29b494c8bdbb373bf87377b [2019-09-05 11:43:38,561 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-09-05 11:43:38,562 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-09-05 11:43:38,563 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-09-05 11:43:38,563 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-09-05 11:43:38,567 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-09-05 11:43:38,568 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 05.09 11:43:38" (1/1) ... [2019-09-05 11:43:38,570 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6595b9fe and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 11:43:38, skipping insertion in model container [2019-09-05 11:43:38,570 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 05.09 11:43:38" (1/1) ... [2019-09-05 11:43:38,576 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-09-05 11:43:38,593 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-09-05 11:43:38,768 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-09-05 11:43:38,771 INFO L188 MainTranslator]: Completed pre-run [2019-09-05 11:43:38,785 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-09-05 11:43:38,797 INFO L192 MainTranslator]: Completed translation [2019-09-05 11:43:38,797 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 11:43:38 WrapperNode [2019-09-05 11:43:38,797 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-09-05 11:43:38,798 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-09-05 11:43:38,798 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-09-05 11:43:38,798 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-09-05 11:43:38,892 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 11:43:38" (1/1) ... [2019-09-05 11:43:38,892 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 11:43:38" (1/1) ... [2019-09-05 11:43:38,896 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 11:43:38" (1/1) ... [2019-09-05 11:43:38,897 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 11:43:38" (1/1) ... [2019-09-05 11:43:38,900 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 11:43:38" (1/1) ... [2019-09-05 11:43:38,907 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 11:43:38" (1/1) ... [2019-09-05 11:43:38,908 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 11:43:38" (1/1) ... [2019-09-05 11:43:38,909 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-09-05 11:43:38,910 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-09-05 11:43:38,910 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-09-05 11:43:38,910 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-09-05 11:43:38,911 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 11:43:38" (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 11:43:38,963 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-09-05 11:43:38,963 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-09-05 11:43:38,964 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-09-05 11:43:38,964 INFO L138 BoogieDeclarations]: Found implementation of procedure f [2019-09-05 11:43:38,964 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-09-05 11:43:38,964 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-09-05 11:43:38,964 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-09-05 11:43:38,964 INFO L130 BoogieDeclarations]: Found specification of procedure f [2019-09-05 11:43:38,964 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-09-05 11:43:38,964 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-09-05 11:43:38,964 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-09-05 11:43:39,112 INFO L278 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-09-05 11:43:39,112 INFO L283 CfgBuilder]: Removed 1 assume(true) statements. [2019-09-05 11:43:39,113 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 05.09 11:43:39 BoogieIcfgContainer [2019-09-05 11:43:39,113 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-09-05 11:43:39,114 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-09-05 11:43:39,115 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-09-05 11:43:39,118 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-09-05 11:43:39,118 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 05.09 11:43:38" (1/3) ... [2019-09-05 11:43:39,119 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@34c60443 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 05.09 11:43:39, skipping insertion in model container [2019-09-05 11:43:39,119 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 11:43:38" (2/3) ... [2019-09-05 11:43:39,119 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@34c60443 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 05.09 11:43:39, skipping insertion in model container [2019-09-05 11:43:39,120 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 05.09 11:43:39" (3/3) ... [2019-09-05 11:43:39,121 INFO L109 eAbstractionObserver]: Analyzing ICFG functions_1-1.c [2019-09-05 11:43:39,130 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-09-05 11:43:39,138 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-09-05 11:43:39,154 INFO L252 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-09-05 11:43:39,185 INFO L128 ementStrategyFactory]: Using default assertion order modulation [2019-09-05 11:43:39,186 INFO L377 AbstractCegarLoop]: Interprodecural is true [2019-09-05 11:43:39,186 INFO L378 AbstractCegarLoop]: Hoare is true [2019-09-05 11:43:39,186 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-09-05 11:43:39,186 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-09-05 11:43:39,187 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-09-05 11:43:39,187 INFO L382 AbstractCegarLoop]: Difference is false [2019-09-05 11:43:39,187 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-09-05 11:43:39,187 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-09-05 11:43:39,204 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states. [2019-09-05 11:43:39,208 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2019-09-05 11:43:39,208 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 11:43:39,209 INFO L399 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 11:43:39,211 INFO L418 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 11:43:39,215 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 11:43:39,215 INFO L82 PathProgramCache]: Analyzing trace with hash -1238725826, now seen corresponding path program 1 times [2019-09-05 11:43:39,217 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 11:43:39,217 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 11:43:39,257 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:43:39,257 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 11:43:39,257 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:43:39,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 11:43:39,325 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 11:43:39,327 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-09-05 11:43:39,327 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2019-09-05 11:43:39,331 INFO L454 AbstractCegarLoop]: Interpolant automaton has 2 states [2019-09-05 11:43:39,341 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2019-09-05 11:43:39,342 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-09-05 11:43:39,344 INFO L87 Difference]: Start difference. First operand 22 states. Second operand 2 states. [2019-09-05 11:43:39,365 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 11:43:39,365 INFO L93 Difference]: Finished difference Result 33 states and 36 transitions. [2019-09-05 11:43:39,365 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2019-09-05 11:43:39,367 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2019-09-05 11:43:39,367 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 11:43:39,375 INFO L225 Difference]: With dead ends: 33 [2019-09-05 11:43:39,375 INFO L226 Difference]: Without dead ends: 16 [2019-09-05 11:43:39,379 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 11:43:39,396 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2019-09-05 11:43:39,409 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2019-09-05 11:43:39,410 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2019-09-05 11:43:39,411 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2019-09-05 11:43:39,413 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 10 [2019-09-05 11:43:39,413 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 11:43:39,413 INFO L475 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2019-09-05 11:43:39,413 INFO L476 AbstractCegarLoop]: Interpolant automaton has 2 states. [2019-09-05 11:43:39,414 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2019-09-05 11:43:39,414 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2019-09-05 11:43:39,414 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 11:43:39,414 INFO L399 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 11:43:39,415 INFO L418 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 11:43:39,415 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 11:43:39,415 INFO L82 PathProgramCache]: Analyzing trace with hash -1244266952, now seen corresponding path program 1 times [2019-09-05 11:43:39,416 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 11:43:39,416 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 11:43:39,417 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:43:39,417 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 11:43:39,417 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:43:39,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 11:43:39,566 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 11:43:39,566 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-09-05 11:43:39,567 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-09-05 11:43:39,569 INFO L454 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-09-05 11:43:39,569 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-09-05 11:43:39,570 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-09-05 11:43:39,570 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 3 states. [2019-09-05 11:43:39,598 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 11:43:39,598 INFO L93 Difference]: Finished difference Result 24 states and 25 transitions. [2019-09-05 11:43:39,604 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-09-05 11:43:39,605 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2019-09-05 11:43:39,605 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 11:43:39,607 INFO L225 Difference]: With dead ends: 24 [2019-09-05 11:43:39,607 INFO L226 Difference]: Without dead ends: 19 [2019-09-05 11:43:39,608 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-09-05 11:43:39,611 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2019-09-05 11:43:39,632 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 17. [2019-09-05 11:43:39,634 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2019-09-05 11:43:39,635 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2019-09-05 11:43:39,636 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 10 [2019-09-05 11:43:39,636 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 11:43:39,636 INFO L475 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2019-09-05 11:43:39,636 INFO L476 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-09-05 11:43:39,637 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2019-09-05 11:43:39,638 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-09-05 11:43:39,638 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 11:43:39,638 INFO L399 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 11:43:39,638 INFO L418 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 11:43:39,638 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 11:43:39,639 INFO L82 PathProgramCache]: Analyzing trace with hash 1831198934, now seen corresponding path program 1 times [2019-09-05 11:43:39,639 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 11:43:39,639 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 11:43:39,640 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:43:39,640 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 11:43:39,640 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:43:39,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 11:43:39,844 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 11:43:39,845 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 11:43:39,845 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) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 11:43:39,859 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 11:43:39,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 11:43:39,884 INFO L256 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 13 conjunts are in the unsatisfiable core [2019-09-05 11:43:39,893 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 11:43:39,968 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 11:43:39,973 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-05 11:43:39,973 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 7 [2019-09-05 11:43:39,974 INFO L454 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-09-05 11:43:39,975 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-09-05 11:43:39,975 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2019-09-05 11:43:39,976 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 7 states. [2019-09-05 11:43:40,072 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 11:43:40,073 INFO L93 Difference]: Finished difference Result 27 states and 29 transitions. [2019-09-05 11:43:40,073 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-09-05 11:43:40,074 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 16 [2019-09-05 11:43:40,074 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 11:43:40,075 INFO L225 Difference]: With dead ends: 27 [2019-09-05 11:43:40,075 INFO L226 Difference]: Without dead ends: 22 [2019-09-05 11:43:40,076 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 14 SyntacticMatches, 3 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2019-09-05 11:43:40,076 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2019-09-05 11:43:40,081 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 20. [2019-09-05 11:43:40,081 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2019-09-05 11:43:40,082 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2019-09-05 11:43:40,082 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 16 [2019-09-05 11:43:40,083 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 11:43:40,083 INFO L475 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2019-09-05 11:43:40,083 INFO L476 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-09-05 11:43:40,083 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2019-09-05 11:43:40,085 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2019-09-05 11:43:40,085 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 11:43:40,085 INFO L399 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 11:43:40,085 INFO L418 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 11:43:40,086 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 11:43:40,086 INFO L82 PathProgramCache]: Analyzing trace with hash 329045236, now seen corresponding path program 2 times [2019-09-05 11:43:40,086 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 11:43:40,086 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 11:43:40,087 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:43:40,087 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 11:43:40,088 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:43:40,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 11:43:40,245 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-09-05 11:43:40,246 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 11:43:40,246 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) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 11:43:40,263 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2019-09-05 11:43:40,279 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-09-05 11:43:40,279 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 11:43:40,280 INFO L256 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 23 conjunts are in the unsatisfiable core [2019-09-05 11:43:40,282 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 11:43:40,334 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-09-05 11:43:40,339 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-05 11:43:40,339 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 9 [2019-09-05 11:43:40,340 INFO L454 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-09-05 11:43:40,340 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-09-05 11:43:40,341 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2019-09-05 11:43:40,341 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand 9 states. [2019-09-05 11:43:40,496 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 11:43:40,496 INFO L93 Difference]: Finished difference Result 30 states and 33 transitions. [2019-09-05 11:43:40,497 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-09-05 11:43:40,497 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 22 [2019-09-05 11:43:40,498 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 11:43:40,498 INFO L225 Difference]: With dead ends: 30 [2019-09-05 11:43:40,498 INFO L226 Difference]: Without dead ends: 25 [2019-09-05 11:43:40,501 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 20 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2019-09-05 11:43:40,501 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2019-09-05 11:43:40,508 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 23. [2019-09-05 11:43:40,509 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2019-09-05 11:43:40,512 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions. [2019-09-05 11:43:40,512 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 22 [2019-09-05 11:43:40,513 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 11:43:40,513 INFO L475 AbstractCegarLoop]: Abstraction has 23 states and 25 transitions. [2019-09-05 11:43:40,513 INFO L476 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-09-05 11:43:40,513 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions. [2019-09-05 11:43:40,515 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2019-09-05 11:43:40,515 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 11:43:40,516 INFO L399 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 11:43:40,516 INFO L418 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 11:43:40,516 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 11:43:40,516 INFO L82 PathProgramCache]: Analyzing trace with hash 755481234, now seen corresponding path program 3 times [2019-09-05 11:43:40,517 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 11:43:40,517 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 11:43:40,521 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:43:40,522 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 11:43:40,522 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:43:40,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 11:43:40,790 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-09-05 11:43:40,791 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 11:43:40,791 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) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 11:43:40,805 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-09-05 11:43:40,827 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2019-09-05 11:43:40,828 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 11:43:40,829 WARN L254 TraceCheckSpWp]: Trace formula consists of 64 conjuncts, 33 conjunts are in the unsatisfiable core [2019-09-05 11:43:40,832 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 11:43:40,892 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-09-05 11:43:40,896 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-05 11:43:40,897 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 11 [2019-09-05 11:43:40,897 INFO L454 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-09-05 11:43:40,898 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-09-05 11:43:40,898 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2019-09-05 11:43:40,898 INFO L87 Difference]: Start difference. First operand 23 states and 25 transitions. Second operand 11 states. [2019-09-05 11:43:41,059 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 11:43:41,059 INFO L93 Difference]: Finished difference Result 33 states and 37 transitions. [2019-09-05 11:43:41,060 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-09-05 11:43:41,060 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 28 [2019-09-05 11:43:41,060 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 11:43:41,061 INFO L225 Difference]: With dead ends: 33 [2019-09-05 11:43:41,061 INFO L226 Difference]: Without dead ends: 28 [2019-09-05 11:43:41,062 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 26 SyntacticMatches, 5 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2019-09-05 11:43:41,062 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2019-09-05 11:43:41,067 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2019-09-05 11:43:41,067 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2019-09-05 11:43:41,068 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 29 transitions. [2019-09-05 11:43:41,068 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 29 transitions. Word has length 28 [2019-09-05 11:43:41,068 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 11:43:41,069 INFO L475 AbstractCegarLoop]: Abstraction has 26 states and 29 transitions. [2019-09-05 11:43:41,069 INFO L476 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-09-05 11:43:41,069 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 29 transitions. [2019-09-05 11:43:41,070 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2019-09-05 11:43:41,070 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 11:43:41,070 INFO L399 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 11:43:41,071 INFO L418 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 11:43:41,071 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 11:43:41,071 INFO L82 PathProgramCache]: Analyzing trace with hash -1475645008, now seen corresponding path program 4 times [2019-09-05 11:43:41,071 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 11:43:41,071 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 11:43:41,072 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:43:41,073 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 11:43:41,073 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:43:41,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 11:43:41,316 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2019-09-05 11:43:41,316 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 11:43:41,317 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 11:43:41,340 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 11:43:41,368 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-09-05 11:43:41,369 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 11:43:41,370 WARN L254 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 43 conjunts are in the unsatisfiable core [2019-09-05 11:43:41,375 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 11:43:41,446 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2019-09-05 11:43:41,451 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-05 11:43:41,451 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 13 [2019-09-05 11:43:41,452 INFO L454 AbstractCegarLoop]: Interpolant automaton has 13 states [2019-09-05 11:43:41,452 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2019-09-05 11:43:41,453 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=128, Unknown=0, NotChecked=0, Total=156 [2019-09-05 11:43:41,454 INFO L87 Difference]: Start difference. First operand 26 states and 29 transitions. Second operand 13 states. [2019-09-05 11:43:41,685 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 11:43:41,685 INFO L93 Difference]: Finished difference Result 36 states and 41 transitions. [2019-09-05 11:43:41,685 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-09-05 11:43:41,685 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 34 [2019-09-05 11:43:41,686 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 11:43:41,687 INFO L225 Difference]: With dead ends: 36 [2019-09-05 11:43:41,687 INFO L226 Difference]: Without dead ends: 31 [2019-09-05 11:43:41,688 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 32 SyntacticMatches, 6 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=48, Invalid=224, Unknown=0, NotChecked=0, Total=272 [2019-09-05 11:43:41,688 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2019-09-05 11:43:41,692 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 29. [2019-09-05 11:43:41,693 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2019-09-05 11:43:41,694 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2019-09-05 11:43:41,694 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 34 [2019-09-05 11:43:41,696 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 11:43:41,696 INFO L475 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2019-09-05 11:43:41,696 INFO L476 AbstractCegarLoop]: Interpolant automaton has 13 states. [2019-09-05 11:43:41,697 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2019-09-05 11:43:41,700 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2019-09-05 11:43:41,700 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 11:43:41,700 INFO L399 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 11:43:41,700 INFO L418 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 11:43:41,701 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 11:43:41,701 INFO L82 PathProgramCache]: Analyzing trace with hash 1545919054, now seen corresponding path program 5 times [2019-09-05 11:43:41,701 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 11:43:41,701 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 11:43:41,702 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:43:41,704 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 11:43:41,704 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:43:41,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 11:43:42,005 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 0 proven. 35 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2019-09-05 11:43:42,005 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 11:43:42,005 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) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 11:43:42,018 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2019-09-05 11:43:42,047 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2019-09-05 11:43:42,047 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 11:43:42,049 WARN L254 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 53 conjunts are in the unsatisfiable core [2019-09-05 11:43:42,051 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 11:43:42,118 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 0 proven. 35 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2019-09-05 11:43:42,122 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-05 11:43:42,122 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 15 [2019-09-05 11:43:42,124 INFO L454 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-09-05 11:43:42,124 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-09-05 11:43:42,125 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=177, Unknown=0, NotChecked=0, Total=210 [2019-09-05 11:43:42,126 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand 15 states. [2019-09-05 11:43:42,440 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 11:43:42,440 INFO L93 Difference]: Finished difference Result 39 states and 45 transitions. [2019-09-05 11:43:42,441 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-09-05 11:43:42,441 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 40 [2019-09-05 11:43:42,442 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 11:43:42,444 INFO L225 Difference]: With dead ends: 39 [2019-09-05 11:43:42,444 INFO L226 Difference]: Without dead ends: 34 [2019-09-05 11:43:42,445 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 38 SyntacticMatches, 7 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=58, Invalid=322, Unknown=0, NotChecked=0, Total=380 [2019-09-05 11:43:42,446 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2019-09-05 11:43:42,453 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 32. [2019-09-05 11:43:42,454 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2019-09-05 11:43:42,455 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 37 transitions. [2019-09-05 11:43:42,456 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 37 transitions. Word has length 40 [2019-09-05 11:43:42,456 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 11:43:42,460 INFO L475 AbstractCegarLoop]: Abstraction has 32 states and 37 transitions. [2019-09-05 11:43:42,460 INFO L476 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-09-05 11:43:42,460 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 37 transitions. [2019-09-05 11:43:42,462 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2019-09-05 11:43:42,462 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 11:43:42,462 INFO L399 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 11:43:42,462 INFO L418 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 11:43:42,462 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 11:43:42,463 INFO L82 PathProgramCache]: Analyzing trace with hash 128504940, now seen corresponding path program 6 times [2019-09-05 11:43:42,463 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 11:43:42,463 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 11:43:42,466 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:43:42,466 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 11:43:42,467 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:43:42,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 11:43:42,770 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 0 proven. 51 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2019-09-05 11:43:42,770 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 11:43:42,770 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 11:43:42,786 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2019-09-05 11:43:42,819 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2019-09-05 11:43:42,820 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 11:43:42,821 WARN L254 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 63 conjunts are in the unsatisfiable core [2019-09-05 11:43:42,825 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 11:43:42,913 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 0 proven. 51 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2019-09-05 11:43:42,917 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-05 11:43:42,918 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 17 [2019-09-05 11:43:42,920 INFO L454 AbstractCegarLoop]: Interpolant automaton has 17 states [2019-09-05 11:43:42,920 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2019-09-05 11:43:42,922 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=234, Unknown=0, NotChecked=0, Total=272 [2019-09-05 11:43:42,922 INFO L87 Difference]: Start difference. First operand 32 states and 37 transitions. Second operand 17 states. [2019-09-05 11:43:43,338 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 11:43:43,338 INFO L93 Difference]: Finished difference Result 42 states and 49 transitions. [2019-09-05 11:43:43,338 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2019-09-05 11:43:43,338 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 46 [2019-09-05 11:43:43,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 11:43:43,339 INFO L225 Difference]: With dead ends: 42 [2019-09-05 11:43:43,340 INFO L226 Difference]: Without dead ends: 37 [2019-09-05 11:43:43,340 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 44 SyntacticMatches, 8 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=68, Invalid=438, Unknown=0, NotChecked=0, Total=506 [2019-09-05 11:43:43,340 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2019-09-05 11:43:43,345 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2019-09-05 11:43:43,345 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2019-09-05 11:43:43,346 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 41 transitions. [2019-09-05 11:43:43,346 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 41 transitions. Word has length 46 [2019-09-05 11:43:43,347 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 11:43:43,347 INFO L475 AbstractCegarLoop]: Abstraction has 35 states and 41 transitions. [2019-09-05 11:43:43,347 INFO L476 AbstractCegarLoop]: Interpolant automaton has 17 states. [2019-09-05 11:43:43,347 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 41 transitions. [2019-09-05 11:43:43,348 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2019-09-05 11:43:43,348 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 11:43:43,348 INFO L399 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 11:43:43,349 INFO L418 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 11:43:43,349 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 11:43:43,349 INFO L82 PathProgramCache]: Analyzing trace with hash -842776566, now seen corresponding path program 7 times [2019-09-05 11:43:43,349 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 11:43:43,349 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 11:43:43,350 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:43:43,350 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 11:43:43,350 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:43:43,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 11:43:43,614 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 0 proven. 70 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2019-09-05 11:43:43,614 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 11:43:43,614 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) [2019-09-05 11:43:43,630 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 11:43:43,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 11:43:43,652 WARN L254 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 73 conjunts are in the unsatisfiable core [2019-09-05 11:43:43,655 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 11:43:43,745 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 0 proven. 70 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2019-09-05 11:43:43,751 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-05 11:43:43,751 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 19 [2019-09-05 11:43:43,751 INFO L454 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-09-05 11:43:43,752 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-09-05 11:43:43,752 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=299, Unknown=0, NotChecked=0, Total=342 [2019-09-05 11:43:43,752 INFO L87 Difference]: Start difference. First operand 35 states and 41 transitions. Second operand 19 states. [2019-09-05 11:43:44,167 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 11:43:44,168 INFO L93 Difference]: Finished difference Result 45 states and 53 transitions. [2019-09-05 11:43:44,171 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-09-05 11:43:44,171 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 52 [2019-09-05 11:43:44,171 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 11:43:44,172 INFO L225 Difference]: With dead ends: 45 [2019-09-05 11:43:44,172 INFO L226 Difference]: Without dead ends: 40 [2019-09-05 11:43:44,173 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 50 SyntacticMatches, 9 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=78, Invalid=572, Unknown=0, NotChecked=0, Total=650 [2019-09-05 11:43:44,173 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2019-09-05 11:43:44,178 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 38. [2019-09-05 11:43:44,178 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2019-09-05 11:43:44,179 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 45 transitions. [2019-09-05 11:43:44,180 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 45 transitions. Word has length 52 [2019-09-05 11:43:44,180 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 11:43:44,180 INFO L475 AbstractCegarLoop]: Abstraction has 38 states and 45 transitions. [2019-09-05 11:43:44,180 INFO L476 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-09-05 11:43:44,180 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 45 transitions. [2019-09-05 11:43:44,181 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2019-09-05 11:43:44,181 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 11:43:44,182 INFO L399 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 11:43:44,182 INFO L418 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 11:43:44,182 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 11:43:44,182 INFO L82 PathProgramCache]: Analyzing trace with hash 880540968, now seen corresponding path program 8 times [2019-09-05 11:43:44,182 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 11:43:44,182 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 11:43:44,183 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:43:44,183 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 11:43:44,183 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:43:44,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 11:43:44,534 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2019-09-05 11:43:44,534 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 11:43:44,534 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) [2019-09-05 11:43:44,560 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 11:43:44,584 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-09-05 11:43:44,584 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 11:43:44,586 WARN L254 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 83 conjunts are in the unsatisfiable core [2019-09-05 11:43:44,589 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 11:43:44,680 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [MP z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (9)] Exception during sending of exit command (exit): Broken pipe [2019-09-05 11:43:44,687 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-05 11:43:44,687 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 21 [2019-09-05 11:43:44,689 INFO L454 AbstractCegarLoop]: Interpolant automaton has 21 states [2019-09-05 11:43:44,689 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2019-09-05 11:43:44,690 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=372, Unknown=0, NotChecked=0, Total=420 [2019-09-05 11:43:44,690 INFO L87 Difference]: Start difference. First operand 38 states and 45 transitions. Second operand 21 states. [2019-09-05 11:43:45,230 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 11:43:45,230 INFO L93 Difference]: Finished difference Result 48 states and 57 transitions. [2019-09-05 11:43:45,231 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2019-09-05 11:43:45,231 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 58 [2019-09-05 11:43:45,232 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 11:43:45,232 INFO L225 Difference]: With dead ends: 48 [2019-09-05 11:43:45,232 INFO L226 Difference]: Without dead ends: 43 [2019-09-05 11:43:45,233 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 56 SyntacticMatches, 10 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=88, Invalid=724, Unknown=0, NotChecked=0, Total=812 [2019-09-05 11:43:45,234 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2019-09-05 11:43:45,239 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 41. [2019-09-05 11:43:45,239 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2019-09-05 11:43:45,240 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 49 transitions. [2019-09-05 11:43:45,240 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 49 transitions. Word has length 58 [2019-09-05 11:43:45,240 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 11:43:45,241 INFO L475 AbstractCegarLoop]: Abstraction has 41 states and 49 transitions. [2019-09-05 11:43:45,241 INFO L476 AbstractCegarLoop]: Interpolant automaton has 21 states. [2019-09-05 11:43:45,241 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 49 transitions. [2019-09-05 11:43:45,242 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2019-09-05 11:43:45,242 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 11:43:45,242 INFO L399 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 11:43:45,242 INFO L418 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 11:43:45,243 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 11:43:45,243 INFO L82 PathProgramCache]: Analyzing trace with hash -1565725754, now seen corresponding path program 9 times [2019-09-05 11:43:45,243 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 11:43:45,243 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 11:43:45,244 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:43:45,244 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 11:43:45,244 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:43:45,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 11:43:45,634 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 117 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2019-09-05 11:43:45,635 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 11:43:45,635 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 11:43:45,657 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-09-05 11:43:45,908 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2019-09-05 11:43:45,909 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 11:43:45,912 WARN L254 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 93 conjunts are in the unsatisfiable core [2019-09-05 11:43:45,915 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 11:43:46,052 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 117 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2019-09-05 11:43:46,058 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-05 11:43:46,059 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 23 [2019-09-05 11:43:46,060 INFO L454 AbstractCegarLoop]: Interpolant automaton has 23 states [2019-09-05 11:43:46,060 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2019-09-05 11:43:46,061 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=453, Unknown=0, NotChecked=0, Total=506 [2019-09-05 11:43:46,061 INFO L87 Difference]: Start difference. First operand 41 states and 49 transitions. Second operand 23 states. [2019-09-05 11:43:46,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 11:43:46,695 INFO L93 Difference]: Finished difference Result 51 states and 61 transitions. [2019-09-05 11:43:46,695 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2019-09-05 11:43:46,695 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 64 [2019-09-05 11:43:46,696 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 11:43:46,697 INFO L225 Difference]: With dead ends: 51 [2019-09-05 11:43:46,697 INFO L226 Difference]: Without dead ends: 46 [2019-09-05 11:43:46,698 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 62 SyntacticMatches, 11 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 47 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=98, Invalid=894, Unknown=0, NotChecked=0, Total=992 [2019-09-05 11:43:46,699 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2019-09-05 11:43:46,704 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 44. [2019-09-05 11:43:46,704 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2019-09-05 11:43:46,705 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 53 transitions. [2019-09-05 11:43:46,705 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 53 transitions. Word has length 64 [2019-09-05 11:43:46,705 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 11:43:46,705 INFO L475 AbstractCegarLoop]: Abstraction has 44 states and 53 transitions. [2019-09-05 11:43:46,706 INFO L476 AbstractCegarLoop]: Interpolant automaton has 23 states. [2019-09-05 11:43:46,706 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 53 transitions. [2019-09-05 11:43:46,707 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2019-09-05 11:43:46,707 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 11:43:46,707 INFO L399 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 11:43:46,707 INFO L418 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 11:43:46,707 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 11:43:46,708 INFO L82 PathProgramCache]: Analyzing trace with hash 1577839588, now seen corresponding path program 10 times [2019-09-05 11:43:46,708 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 11:43:46,708 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 11:43:46,709 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:43:46,709 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 11:43:46,709 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:43:46,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 11:43:47,167 INFO L134 CoverageAnalysis]: Checked inductivity of 280 backedges. 0 proven. 145 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2019-09-05 11:43:47,168 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 11:43:47,168 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 11:43:47,198 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 11:43:47,224 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-09-05 11:43:47,224 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 11:43:47,227 WARN L254 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 103 conjunts are in the unsatisfiable core [2019-09-05 11:43:47,230 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 11:43:47,397 INFO L134 CoverageAnalysis]: Checked inductivity of 280 backedges. 0 proven. 145 refuted. 0 times theorem prover too weak. 135 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 11:43:47,406 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-05 11:43:47,406 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24] total 25 [2019-09-05 11:43:47,406 INFO L454 AbstractCegarLoop]: Interpolant automaton has 25 states [2019-09-05 11:43:47,407 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2019-09-05 11:43:47,409 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=542, Unknown=0, NotChecked=0, Total=600 [2019-09-05 11:43:47,409 INFO L87 Difference]: Start difference. First operand 44 states and 53 transitions. Second operand 25 states. [2019-09-05 11:43:48,206 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 11:43:48,207 INFO L93 Difference]: Finished difference Result 54 states and 65 transitions. [2019-09-05 11:43:48,207 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2019-09-05 11:43:48,207 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 70 [2019-09-05 11:43:48,208 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 11:43:48,209 INFO L225 Difference]: With dead ends: 54 [2019-09-05 11:43:48,209 INFO L226 Difference]: Without dead ends: 49 [2019-09-05 11:43:48,211 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 68 SyntacticMatches, 12 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 57 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=108, Invalid=1082, Unknown=0, NotChecked=0, Total=1190 [2019-09-05 11:43:48,211 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2019-09-05 11:43:48,216 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 47. [2019-09-05 11:43:48,216 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2019-09-05 11:43:48,218 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 57 transitions. [2019-09-05 11:43:48,218 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 57 transitions. Word has length 70 [2019-09-05 11:43:48,218 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 11:43:48,218 INFO L475 AbstractCegarLoop]: Abstraction has 47 states and 57 transitions. [2019-09-05 11:43:48,219 INFO L476 AbstractCegarLoop]: Interpolant automaton has 25 states. [2019-09-05 11:43:48,219 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 57 transitions. [2019-09-05 11:43:48,220 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2019-09-05 11:43:48,220 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 11:43:48,220 INFO L399 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 11:43:48,220 INFO L418 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 11:43:48,221 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 11:43:48,221 INFO L82 PathProgramCache]: Analyzing trace with hash 153476482, now seen corresponding path program 11 times [2019-09-05 11:43:48,221 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 11:43:48,221 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 11:43:48,222 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:43:48,222 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 11:43:48,222 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:43:48,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 11:43:48,673 INFO L134 CoverageAnalysis]: Checked inductivity of 341 backedges. 0 proven. 176 refuted. 0 times theorem prover too weak. 165 trivial. 0 not checked. [2019-09-05 11:43:48,673 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 11:43:48,673 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 11:43:48,685 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2019-09-05 11:44:46,164 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2019-09-05 11:44:46,164 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 11:44:46,246 WARN L254 TraceCheckSpWp]: Trace formula consists of 176 conjuncts, 113 conjunts are in the unsatisfiable core [2019-09-05 11:44:46,248 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 11:44:46,372 INFO L134 CoverageAnalysis]: Checked inductivity of 341 backedges. 0 proven. 176 refuted. 0 times theorem prover too weak. 165 trivial. 0 not checked. [2019-09-05 11:44:46,379 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-05 11:44:46,379 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26] total 27 [2019-09-05 11:44:46,379 INFO L454 AbstractCegarLoop]: Interpolant automaton has 27 states [2019-09-05 11:44:46,380 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2019-09-05 11:44:46,380 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=639, Unknown=0, NotChecked=0, Total=702 [2019-09-05 11:44:46,380 INFO L87 Difference]: Start difference. First operand 47 states and 57 transitions. Second operand 27 states. [2019-09-05 11:44:47,265 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 11:44:47,265 INFO L93 Difference]: Finished difference Result 57 states and 69 transitions. [2019-09-05 11:44:47,266 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2019-09-05 11:44:47,266 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 76 [2019-09-05 11:44:47,266 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 11:44:47,267 INFO L225 Difference]: With dead ends: 57 [2019-09-05 11:44:47,267 INFO L226 Difference]: Without dead ends: 52 [2019-09-05 11:44:47,268 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 74 SyntacticMatches, 13 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 68 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=118, Invalid=1288, Unknown=0, NotChecked=0, Total=1406 [2019-09-05 11:44:47,268 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2019-09-05 11:44:47,274 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 50. [2019-09-05 11:44:47,274 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2019-09-05 11:44:47,275 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 61 transitions. [2019-09-05 11:44:47,275 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 61 transitions. Word has length 76 [2019-09-05 11:44:47,275 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 11:44:47,276 INFO L475 AbstractCegarLoop]: Abstraction has 50 states and 61 transitions. [2019-09-05 11:44:47,276 INFO L476 AbstractCegarLoop]: Interpolant automaton has 27 states. [2019-09-05 11:44:47,276 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 61 transitions. [2019-09-05 11:44:47,277 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2019-09-05 11:44:47,277 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 11:44:47,277 INFO L399 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 11:44:47,277 INFO L418 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 11:44:47,278 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 11:44:47,278 INFO L82 PathProgramCache]: Analyzing trace with hash -1587568480, now seen corresponding path program 12 times [2019-09-05 11:44:47,278 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 11:44:47,278 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 11:44:47,279 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:44:47,279 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 11:44:47,279 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:44:47,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 11:44:47,769 INFO L134 CoverageAnalysis]: Checked inductivity of 408 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 198 trivial. 0 not checked. [2019-09-05 11:44:47,770 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 11:44:47,770 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 11:44:47,780 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2019-09-05 11:45:18,269 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2019-09-05 11:45:18,269 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 11:45:18,348 WARN L254 TraceCheckSpWp]: Trace formula consists of 190 conjuncts, 123 conjunts are in the unsatisfiable core [2019-09-05 11:45:18,350 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 11:45:18,488 INFO L134 CoverageAnalysis]: Checked inductivity of 408 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 198 trivial. 0 not checked. [2019-09-05 11:45:18,495 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-05 11:45:18,495 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28] total 29 [2019-09-05 11:45:18,497 INFO L454 AbstractCegarLoop]: Interpolant automaton has 29 states [2019-09-05 11:45:18,497 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2019-09-05 11:45:18,498 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=744, Unknown=0, NotChecked=0, Total=812 [2019-09-05 11:45:18,498 INFO L87 Difference]: Start difference. First operand 50 states and 61 transitions. Second operand 29 states. [2019-09-05 11:45:19,498 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 11:45:19,499 INFO L93 Difference]: Finished difference Result 60 states and 73 transitions. [2019-09-05 11:45:19,499 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2019-09-05 11:45:19,499 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 82 [2019-09-05 11:45:19,500 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 11:45:19,500 INFO L225 Difference]: With dead ends: 60 [2019-09-05 11:45:19,501 INFO L226 Difference]: Without dead ends: 55 [2019-09-05 11:45:19,502 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 80 SyntacticMatches, 14 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 80 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=128, Invalid=1512, Unknown=0, NotChecked=0, Total=1640 [2019-09-05 11:45:19,502 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2019-09-05 11:45:19,507 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 53. [2019-09-05 11:45:19,507 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2019-09-05 11:45:19,508 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 65 transitions. [2019-09-05 11:45:19,508 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 65 transitions. Word has length 82 [2019-09-05 11:45:19,508 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 11:45:19,509 INFO L475 AbstractCegarLoop]: Abstraction has 53 states and 65 transitions. [2019-09-05 11:45:19,509 INFO L476 AbstractCegarLoop]: Interpolant automaton has 29 states. [2019-09-05 11:45:19,509 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 65 transitions. [2019-09-05 11:45:19,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2019-09-05 11:45:19,510 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 11:45:19,510 INFO L399 BasicCegarLoop]: trace histogram [13, 13, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 11:45:19,511 INFO L418 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 11:45:19,511 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 11:45:19,511 INFO L82 PathProgramCache]: Analyzing trace with hash -50981570, now seen corresponding path program 13 times [2019-09-05 11:45:19,511 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 11:45:19,511 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 11:45:19,512 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:45:19,512 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 11:45:19,512 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:45:19,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 11:45:20,129 INFO L134 CoverageAnalysis]: Checked inductivity of 481 backedges. 0 proven. 247 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2019-09-05 11:45:20,130 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 11:45:20,130 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 11:45:20,141 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 11:45:20,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 11:45:20,173 WARN L254 TraceCheckSpWp]: Trace formula consists of 204 conjuncts, 133 conjunts are in the unsatisfiable core [2019-09-05 11:45:20,175 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 11:45:20,274 INFO L134 CoverageAnalysis]: Checked inductivity of 481 backedges. 0 proven. 247 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2019-09-05 11:45:20,277 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-05 11:45:20,278 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30] total 31 [2019-09-05 11:45:20,278 INFO L454 AbstractCegarLoop]: Interpolant automaton has 31 states [2019-09-05 11:45:20,278 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2019-09-05 11:45:20,279 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=857, Unknown=0, NotChecked=0, Total=930 [2019-09-05 11:45:20,279 INFO L87 Difference]: Start difference. First operand 53 states and 65 transitions. Second operand 31 states. [2019-09-05 11:45:21,420 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 11:45:21,420 INFO L93 Difference]: Finished difference Result 63 states and 77 transitions. [2019-09-05 11:45:21,420 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2019-09-05 11:45:21,421 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 88 [2019-09-05 11:45:21,421 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 11:45:21,422 INFO L225 Difference]: With dead ends: 63 [2019-09-05 11:45:21,423 INFO L226 Difference]: Without dead ends: 58 [2019-09-05 11:45:21,424 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 86 SyntacticMatches, 15 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 93 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=138, Invalid=1754, Unknown=0, NotChecked=0, Total=1892 [2019-09-05 11:45:21,424 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2019-09-05 11:45:21,429 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 56. [2019-09-05 11:45:21,429 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2019-09-05 11:45:21,430 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 69 transitions. [2019-09-05 11:45:21,430 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 69 transitions. Word has length 88 [2019-09-05 11:45:21,431 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 11:45:21,431 INFO L475 AbstractCegarLoop]: Abstraction has 56 states and 69 transitions. [2019-09-05 11:45:21,431 INFO L476 AbstractCegarLoop]: Interpolant automaton has 31 states. [2019-09-05 11:45:21,431 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 69 transitions. [2019-09-05 11:45:21,432 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2019-09-05 11:45:21,432 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 11:45:21,433 INFO L399 BasicCegarLoop]: trace histogram [14, 14, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 11:45:21,433 INFO L418 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 11:45:21,433 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 11:45:21,433 INFO L82 PathProgramCache]: Analyzing trace with hash -922870948, now seen corresponding path program 14 times [2019-09-05 11:45:21,433 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 11:45:21,433 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 11:45:21,434 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:45:21,434 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 11:45:21,434 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:45:21,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 11:45:22,180 INFO L134 CoverageAnalysis]: Checked inductivity of 560 backedges. 0 proven. 287 refuted. 0 times theorem prover too weak. 273 trivial. 0 not checked. [2019-09-05 11:45:22,181 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 11:45:22,181 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) [2019-09-05 11:45:22,213 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 11:45:22,249 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-09-05 11:45:22,249 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 11:45:22,252 WARN L254 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 143 conjunts are in the unsatisfiable core [2019-09-05 11:45:22,256 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 11:45:22,412 INFO L134 CoverageAnalysis]: Checked inductivity of 560 backedges. 0 proven. 287 refuted. 0 times theorem prover too weak. 273 trivial. 0 not checked. [2019-09-05 11:45:22,424 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-05 11:45:22,425 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32] total 33 [2019-09-05 11:45:22,426 INFO L454 AbstractCegarLoop]: Interpolant automaton has 33 states [2019-09-05 11:45:22,427 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2019-09-05 11:45:22,434 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=978, Unknown=0, NotChecked=0, Total=1056 [2019-09-05 11:45:22,435 INFO L87 Difference]: Start difference. First operand 56 states and 69 transitions. Second operand 33 states. [2019-09-05 11:45:23,650 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 11:45:23,650 INFO L93 Difference]: Finished difference Result 66 states and 81 transitions. [2019-09-05 11:45:23,651 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2019-09-05 11:45:23,651 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 94 [2019-09-05 11:45:23,651 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 11:45:23,652 INFO L225 Difference]: With dead ends: 66 [2019-09-05 11:45:23,653 INFO L226 Difference]: Without dead ends: 61 [2019-09-05 11:45:23,654 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 153 GetRequests, 92 SyntacticMatches, 16 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 107 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=148, Invalid=2014, Unknown=0, NotChecked=0, Total=2162 [2019-09-05 11:45:23,654 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2019-09-05 11:45:23,660 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 59. [2019-09-05 11:45:23,660 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2019-09-05 11:45:23,661 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 73 transitions. [2019-09-05 11:45:23,661 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 73 transitions. Word has length 94 [2019-09-05 11:45:23,661 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 11:45:23,661 INFO L475 AbstractCegarLoop]: Abstraction has 59 states and 73 transitions. [2019-09-05 11:45:23,661 INFO L476 AbstractCegarLoop]: Interpolant automaton has 33 states. [2019-09-05 11:45:23,662 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 73 transitions. [2019-09-05 11:45:23,662 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2019-09-05 11:45:23,663 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 11:45:23,663 INFO L399 BasicCegarLoop]: trace histogram [15, 15, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 11:45:23,663 INFO L418 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 11:45:23,663 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 11:45:23,663 INFO L82 PathProgramCache]: Analyzing trace with hash 124031738, now seen corresponding path program 15 times [2019-09-05 11:45:23,664 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 11:45:23,664 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 11:45:23,664 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:45:23,665 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 11:45:23,665 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:45:23,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 11:45:24,303 INFO L134 CoverageAnalysis]: Checked inductivity of 645 backedges. 0 proven. 330 refuted. 0 times theorem prover too weak. 315 trivial. 0 not checked. [2019-09-05 11:45:24,303 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 11:45:24,303 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 11:45:24,316 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-09-05 11:46:25,952 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2019-09-05 11:46:25,952 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 11:46:26,084 WARN L254 TraceCheckSpWp]: Trace formula consists of 232 conjuncts, 154 conjunts are in the unsatisfiable core [2019-09-05 11:46:26,086 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 11:46:26,250 INFO L134 CoverageAnalysis]: Checked inductivity of 645 backedges. 0 proven. 330 refuted. 0 times theorem prover too weak. 315 trivial. 0 not checked. [2019-09-05 11:46:26,257 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-05 11:46:26,257 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34] total 35 [2019-09-05 11:46:26,257 INFO L454 AbstractCegarLoop]: Interpolant automaton has 35 states [2019-09-05 11:46:26,258 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2019-09-05 11:46:26,258 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=1107, Unknown=0, NotChecked=0, Total=1190 [2019-09-05 11:46:26,258 INFO L87 Difference]: Start difference. First operand 59 states and 73 transitions. Second operand 35 states. [2019-09-05 11:46:27,655 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 11:46:27,655 INFO L93 Difference]: Finished difference Result 69 states and 85 transitions. [2019-09-05 11:46:27,655 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2019-09-05 11:46:27,656 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 100 [2019-09-05 11:46:27,656 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 11:46:27,657 INFO L225 Difference]: With dead ends: 69 [2019-09-05 11:46:27,657 INFO L226 Difference]: Without dead ends: 64 [2019-09-05 11:46:27,659 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 97 SyntacticMatches, 18 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 124 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=158, Invalid=2292, Unknown=0, NotChecked=0, Total=2450 [2019-09-05 11:46:27,659 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2019-09-05 11:46:27,664 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 62. [2019-09-05 11:46:27,664 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2019-09-05 11:46:27,665 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 77 transitions. [2019-09-05 11:46:27,665 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 77 transitions. Word has length 100 [2019-09-05 11:46:27,666 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 11:46:27,666 INFO L475 AbstractCegarLoop]: Abstraction has 62 states and 77 transitions. [2019-09-05 11:46:27,666 INFO L476 AbstractCegarLoop]: Interpolant automaton has 35 states. [2019-09-05 11:46:27,666 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 77 transitions. [2019-09-05 11:46:27,667 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2019-09-05 11:46:27,667 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 11:46:27,667 INFO L399 BasicCegarLoop]: trace histogram [16, 16, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 11:46:27,667 INFO L418 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 11:46:27,668 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 11:46:27,668 INFO L82 PathProgramCache]: Analyzing trace with hash 216947736, now seen corresponding path program 16 times [2019-09-05 11:46:27,668 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 11:46:27,668 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 11:46:27,669 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:46:27,669 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 11:46:27,669 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:46:27,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 11:46:28,383 INFO L134 CoverageAnalysis]: Checked inductivity of 736 backedges. 0 proven. 376 refuted. 0 times theorem prover too weak. 360 trivial. 0 not checked. [2019-09-05 11:46:28,383 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 11:46:28,384 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 11:46:28,394 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-09-05 11:46:28,430 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-09-05 11:46:28,431 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 11:46:28,434 WARN L254 TraceCheckSpWp]: Trace formula consists of 246 conjuncts, 163 conjunts are in the unsatisfiable core [2019-09-05 11:46:28,436 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 11:46:28,583 INFO L134 CoverageAnalysis]: Checked inductivity of 736 backedges. 0 proven. 376 refuted. 0 times theorem prover too weak. 360 trivial. 0 not checked. [2019-09-05 11:46:28,593 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-05 11:46:28,593 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36] total 37 [2019-09-05 11:46:28,595 INFO L454 AbstractCegarLoop]: Interpolant automaton has 37 states [2019-09-05 11:46:28,595 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2019-09-05 11:46:28,596 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=1244, Unknown=0, NotChecked=0, Total=1332 [2019-09-05 11:46:28,596 INFO L87 Difference]: Start difference. First operand 62 states and 77 transitions. Second operand 37 states. [2019-09-05 11:46:30,160 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 11:46:30,160 INFO L93 Difference]: Finished difference Result 72 states and 89 transitions. [2019-09-05 11:46:30,160 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2019-09-05 11:46:30,161 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 106 [2019-09-05 11:46:30,161 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 11:46:30,163 INFO L225 Difference]: With dead ends: 72 [2019-09-05 11:46:30,163 INFO L226 Difference]: Without dead ends: 67 [2019-09-05 11:46:30,164 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 173 GetRequests, 104 SyntacticMatches, 18 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 138 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=168, Invalid=2588, Unknown=0, NotChecked=0, Total=2756 [2019-09-05 11:46:30,164 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2019-09-05 11:46:30,169 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 65. [2019-09-05 11:46:30,169 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2019-09-05 11:46:30,170 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 81 transitions. [2019-09-05 11:46:30,170 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 81 transitions. Word has length 106 [2019-09-05 11:46:30,170 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 11:46:30,171 INFO L475 AbstractCegarLoop]: Abstraction has 65 states and 81 transitions. [2019-09-05 11:46:30,171 INFO L476 AbstractCegarLoop]: Interpolant automaton has 37 states. [2019-09-05 11:46:30,171 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 81 transitions. [2019-09-05 11:46:30,172 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2019-09-05 11:46:30,172 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 11:46:30,172 INFO L399 BasicCegarLoop]: trace histogram [17, 17, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 11:46:30,172 INFO L418 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 11:46:30,172 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 11:46:30,173 INFO L82 PathProgramCache]: Analyzing trace with hash -13085002, now seen corresponding path program 17 times [2019-09-05 11:46:30,173 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 11:46:30,173 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 11:46:30,173 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:46:30,174 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 11:46:30,174 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:46:30,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 11:46:31,065 INFO L134 CoverageAnalysis]: Checked inductivity of 833 backedges. 0 proven. 425 refuted. 0 times theorem prover too weak. 408 trivial. 0 not checked. [2019-09-05 11:46:31,066 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 11:46:31,066 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 11:46:31,076 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2019-09-05 11:48:30,912 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2019-09-05 11:48:30,913 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 11:48:31,207 WARN L254 TraceCheckSpWp]: Trace formula consists of 260 conjuncts, 173 conjunts are in the unsatisfiable core [2019-09-05 11:48:31,209 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 11:48:31,335 INFO L134 CoverageAnalysis]: Checked inductivity of 833 backedges. 0 proven. 425 refuted. 0 times theorem prover too weak. 408 trivial. 0 not checked. [2019-09-05 11:48:31,342 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-05 11:48:31,342 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38] total 39 [2019-09-05 11:48:31,342 INFO L454 AbstractCegarLoop]: Interpolant automaton has 39 states [2019-09-05 11:48:31,343 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2019-09-05 11:48:31,343 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=1389, Unknown=0, NotChecked=0, Total=1482 [2019-09-05 11:48:31,344 INFO L87 Difference]: Start difference. First operand 65 states and 81 transitions. Second operand 39 states. [2019-09-05 11:48:33,042 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 11:48:33,043 INFO L93 Difference]: Finished difference Result 75 states and 93 transitions. [2019-09-05 11:48:33,043 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2019-09-05 11:48:33,043 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 112 [2019-09-05 11:48:33,044 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 11:48:33,045 INFO L225 Difference]: With dead ends: 75 [2019-09-05 11:48:33,045 INFO L226 Difference]: Without dead ends: 70 [2019-09-05 11:48:33,047 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 183 GetRequests, 110 SyntacticMatches, 19 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 155 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=178, Invalid=2902, Unknown=0, NotChecked=0, Total=3080 [2019-09-05 11:48:33,047 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2019-09-05 11:48:33,051 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 68. [2019-09-05 11:48:33,052 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2019-09-05 11:48:33,052 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 85 transitions. [2019-09-05 11:48:33,053 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 85 transitions. Word has length 112 [2019-09-05 11:48:33,053 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 11:48:33,053 INFO L475 AbstractCegarLoop]: Abstraction has 68 states and 85 transitions. [2019-09-05 11:48:33,053 INFO L476 AbstractCegarLoop]: Interpolant automaton has 39 states. [2019-09-05 11:48:33,053 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 85 transitions. [2019-09-05 11:48:33,054 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2019-09-05 11:48:33,054 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 11:48:33,055 INFO L399 BasicCegarLoop]: trace histogram [18, 18, 18, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 11:48:33,055 INFO L418 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 11:48:33,055 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 11:48:33,055 INFO L82 PathProgramCache]: Analyzing trace with hash -759733548, now seen corresponding path program 18 times [2019-09-05 11:48:33,055 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 11:48:33,055 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 11:48:33,056 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:48:33,056 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 11:48:33,056 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:48:33,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 11:48:34,026 INFO L134 CoverageAnalysis]: Checked inductivity of 936 backedges. 0 proven. 477 refuted. 0 times theorem prover too weak. 459 trivial. 0 not checked. [2019-09-05 11:48:34,026 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 11:48:34,026 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 11:48:34,037 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2019-09-05 11:48:40,639 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2019-09-05 11:48:40,639 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 11:48:40,670 WARN L254 TraceCheckSpWp]: Trace formula consists of 274 conjuncts, 183 conjunts are in the unsatisfiable core [2019-09-05 11:48:40,672 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 11:48:40,821 INFO L134 CoverageAnalysis]: Checked inductivity of 936 backedges. 0 proven. 477 refuted. 0 times theorem prover too weak. 459 trivial. 0 not checked. [2019-09-05 11:48:40,827 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-05 11:48:40,827 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40] total 41 [2019-09-05 11:48:40,828 INFO L454 AbstractCegarLoop]: Interpolant automaton has 41 states [2019-09-05 11:48:40,828 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2019-09-05 11:48:40,829 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=1542, Unknown=0, NotChecked=0, Total=1640 [2019-09-05 11:48:40,829 INFO L87 Difference]: Start difference. First operand 68 states and 85 transitions. Second operand 41 states. [2019-09-05 11:48:42,754 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 11:48:42,754 INFO L93 Difference]: Finished difference Result 78 states and 97 transitions. [2019-09-05 11:48:42,755 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2019-09-05 11:48:42,755 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 118 [2019-09-05 11:48:42,755 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 11:48:42,756 INFO L225 Difference]: With dead ends: 78 [2019-09-05 11:48:42,757 INFO L226 Difference]: Without dead ends: 73 [2019-09-05 11:48:42,758 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 193 GetRequests, 116 SyntacticMatches, 20 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 173 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=188, Invalid=3234, Unknown=0, NotChecked=0, Total=3422 [2019-09-05 11:48:42,758 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2019-09-05 11:48:42,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 71. [2019-09-05 11:48:42,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2019-09-05 11:48:42,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 89 transitions. [2019-09-05 11:48:42,763 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 89 transitions. Word has length 118 [2019-09-05 11:48:42,764 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 11:48:42,764 INFO L475 AbstractCegarLoop]: Abstraction has 71 states and 89 transitions. [2019-09-05 11:48:42,764 INFO L476 AbstractCegarLoop]: Interpolant automaton has 41 states. [2019-09-05 11:48:42,764 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 89 transitions. [2019-09-05 11:48:42,765 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2019-09-05 11:48:42,765 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 11:48:42,765 INFO L399 BasicCegarLoop]: trace histogram [19, 19, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 11:48:42,765 INFO L418 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 11:48:42,765 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 11:48:42,766 INFO L82 PathProgramCache]: Analyzing trace with hash -927440782, now seen corresponding path program 19 times [2019-09-05 11:48:42,766 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 11:48:42,766 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 11:48:42,766 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:48:42,767 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 11:48:42,767 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:48:42,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 11:48:43,869 INFO L134 CoverageAnalysis]: Checked inductivity of 1045 backedges. 0 proven. 532 refuted. 0 times theorem prover too weak. 513 trivial. 0 not checked. [2019-09-05 11:48:43,870 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 11:48:43,870 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) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 11:48:43,878 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 11:48:43,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 11:48:43,923 WARN L254 TraceCheckSpWp]: Trace formula consists of 288 conjuncts, 193 conjunts are in the unsatisfiable core [2019-09-05 11:48:43,926 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 11:48:44,067 INFO L134 CoverageAnalysis]: Checked inductivity of 1045 backedges. 0 proven. 532 refuted. 0 times theorem prover too weak. 513 trivial. 0 not checked. [2019-09-05 11:48:44,071 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-05 11:48:44,071 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 42] total 43 [2019-09-05 11:48:44,071 INFO L454 AbstractCegarLoop]: Interpolant automaton has 43 states [2019-09-05 11:48:44,071 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2019-09-05 11:48:44,072 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=1703, Unknown=0, NotChecked=0, Total=1806 [2019-09-05 11:48:44,072 INFO L87 Difference]: Start difference. First operand 71 states and 89 transitions. Second operand 43 states. [2019-09-05 11:48:46,346 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 11:48:46,346 INFO L93 Difference]: Finished difference Result 81 states and 101 transitions. [2019-09-05 11:48:46,347 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2019-09-05 11:48:46,347 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 124 [2019-09-05 11:48:46,347 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 11:48:46,348 INFO L225 Difference]: With dead ends: 81 [2019-09-05 11:48:46,348 INFO L226 Difference]: Without dead ends: 76 [2019-09-05 11:48:46,350 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 203 GetRequests, 122 SyntacticMatches, 21 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 192 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=198, Invalid=3584, Unknown=0, NotChecked=0, Total=3782 [2019-09-05 11:48:46,350 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2019-09-05 11:48:46,354 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 74. [2019-09-05 11:48:46,354 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2019-09-05 11:48:46,355 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 93 transitions. [2019-09-05 11:48:46,355 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 93 transitions. Word has length 124 [2019-09-05 11:48:46,356 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 11:48:46,356 INFO L475 AbstractCegarLoop]: Abstraction has 74 states and 93 transitions. [2019-09-05 11:48:46,356 INFO L476 AbstractCegarLoop]: Interpolant automaton has 43 states. [2019-09-05 11:48:46,356 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 93 transitions. [2019-09-05 11:48:46,357 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2019-09-05 11:48:46,357 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 11:48:46,357 INFO L399 BasicCegarLoop]: trace histogram [20, 20, 20, 20, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 11:48:46,357 INFO L418 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 11:48:46,358 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 11:48:46,358 INFO L82 PathProgramCache]: Analyzing trace with hash 1835020176, now seen corresponding path program 20 times [2019-09-05 11:48:46,358 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 11:48:46,358 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 11:48:46,359 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:48:46,359 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 11:48:46,359 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:48:46,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 11:48:47,372 INFO L134 CoverageAnalysis]: Checked inductivity of 1160 backedges. 0 proven. 590 refuted. 0 times theorem prover too weak. 570 trivial. 0 not checked. [2019-09-05 11:48:47,372 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 11:48:47,372 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 11:48:47,382 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2019-09-05 11:48:47,437 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-09-05 11:48:47,438 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 11:48:47,444 WARN L254 TraceCheckSpWp]: Trace formula consists of 302 conjuncts, 203 conjunts are in the unsatisfiable core [2019-09-05 11:48:47,446 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 11:48:47,614 INFO L134 CoverageAnalysis]: Checked inductivity of 1160 backedges. 0 proven. 590 refuted. 0 times theorem prover too weak. 570 trivial. 0 not checked. [2019-09-05 11:48:47,627 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-05 11:48:47,628 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44] total 45 [2019-09-05 11:48:47,628 INFO L454 AbstractCegarLoop]: Interpolant automaton has 45 states [2019-09-05 11:48:47,628 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2019-09-05 11:48:47,630 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=1872, Unknown=0, NotChecked=0, Total=1980 [2019-09-05 11:48:47,630 INFO L87 Difference]: Start difference. First operand 74 states and 93 transitions. Second operand 45 states. [2019-09-05 11:48:49,904 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 11:48:49,905 INFO L93 Difference]: Finished difference Result 84 states and 105 transitions. [2019-09-05 11:48:49,907 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2019-09-05 11:48:49,908 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 130 [2019-09-05 11:48:49,908 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 11:48:49,908 INFO L225 Difference]: With dead ends: 84 [2019-09-05 11:48:49,909 INFO L226 Difference]: Without dead ends: 79 [2019-09-05 11:48:49,910 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 213 GetRequests, 128 SyntacticMatches, 22 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 212 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=208, Invalid=3952, Unknown=0, NotChecked=0, Total=4160 [2019-09-05 11:48:49,910 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2019-09-05 11:48:49,914 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 77. [2019-09-05 11:48:49,914 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2019-09-05 11:48:49,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 97 transitions. [2019-09-05 11:48:49,915 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 97 transitions. Word has length 130 [2019-09-05 11:48:49,915 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 11:48:49,915 INFO L475 AbstractCegarLoop]: Abstraction has 77 states and 97 transitions. [2019-09-05 11:48:49,916 INFO L476 AbstractCegarLoop]: Interpolant automaton has 45 states. [2019-09-05 11:48:49,916 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 97 transitions. [2019-09-05 11:48:49,917 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2019-09-05 11:48:49,917 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 11:48:49,917 INFO L399 BasicCegarLoop]: trace histogram [21, 21, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 11:48:49,917 INFO L418 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 11:48:49,917 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 11:48:49,917 INFO L82 PathProgramCache]: Analyzing trace with hash 363573294, now seen corresponding path program 21 times [2019-09-05 11:48:49,918 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 11:48:49,918 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 11:48:49,918 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:48:49,918 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 11:48:49,919 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:48:49,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 11:48:51,006 INFO L134 CoverageAnalysis]: Checked inductivity of 1281 backedges. 0 proven. 651 refuted. 0 times theorem prover too weak. 630 trivial. 0 not checked. [2019-09-05 11:48:51,006 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 11:48:51,006 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 11:48:51,017 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-09-05 11:50:06,813 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2019-09-05 11:50:06,813 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 11:50:07,240 WARN L254 TraceCheckSpWp]: Trace formula consists of 316 conjuncts, 214 conjunts are in the unsatisfiable core [2019-09-05 11:50:07,244 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 11:50:07,426 INFO L134 CoverageAnalysis]: Checked inductivity of 1281 backedges. 0 proven. 651 refuted. 0 times theorem prover too weak. 630 trivial. 0 not checked. [2019-09-05 11:50:07,434 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-05 11:50:07,434 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 46] total 47 [2019-09-05 11:50:07,434 INFO L454 AbstractCegarLoop]: Interpolant automaton has 47 states [2019-09-05 11:50:07,435 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2019-09-05 11:50:07,435 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=2049, Unknown=0, NotChecked=0, Total=2162 [2019-09-05 11:50:07,436 INFO L87 Difference]: Start difference. First operand 77 states and 97 transitions. Second operand 47 states. [2019-09-05 11:50:09,915 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 11:50:09,915 INFO L93 Difference]: Finished difference Result 87 states and 109 transitions. [2019-09-05 11:50:09,916 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2019-09-05 11:50:09,916 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 136 [2019-09-05 11:50:09,916 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 11:50:09,918 INFO L225 Difference]: With dead ends: 87 [2019-09-05 11:50:09,918 INFO L226 Difference]: Without dead ends: 82 [2019-09-05 11:50:09,920 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 223 GetRequests, 133 SyntacticMatches, 24 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 235 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=218, Invalid=4338, Unknown=0, NotChecked=0, Total=4556 [2019-09-05 11:50:09,920 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2019-09-05 11:50:09,923 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 80. [2019-09-05 11:50:09,924 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2019-09-05 11:50:09,924 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 101 transitions. [2019-09-05 11:50:09,925 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 101 transitions. Word has length 136 [2019-09-05 11:50:09,925 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 11:50:09,925 INFO L475 AbstractCegarLoop]: Abstraction has 80 states and 101 transitions. [2019-09-05 11:50:09,925 INFO L476 AbstractCegarLoop]: Interpolant automaton has 47 states. [2019-09-05 11:50:09,925 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 101 transitions. [2019-09-05 11:50:09,926 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 143 [2019-09-05 11:50:09,926 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 11:50:09,927 INFO L399 BasicCegarLoop]: trace histogram [22, 22, 22, 22, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 11:50:09,927 INFO L418 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 11:50:09,927 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 11:50:09,927 INFO L82 PathProgramCache]: Analyzing trace with hash -579878324, now seen corresponding path program 22 times [2019-09-05 11:50:09,927 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 11:50:09,927 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 11:50:09,928 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:50:09,928 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 11:50:09,928 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:50:09,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 11:50:11,194 INFO L134 CoverageAnalysis]: Checked inductivity of 1408 backedges. 0 proven. 715 refuted. 0 times theorem prover too weak. 693 trivial. 0 not checked. [2019-09-05 11:50:11,195 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 11:50:11,195 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 11:50:11,208 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-09-05 11:50:11,257 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-09-05 11:50:11,258 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 11:50:11,261 WARN L254 TraceCheckSpWp]: Trace formula consists of 330 conjuncts, 223 conjunts are in the unsatisfiable core [2019-09-05 11:50:11,264 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 11:50:11,440 INFO L134 CoverageAnalysis]: Checked inductivity of 1408 backedges. 0 proven. 715 refuted. 0 times theorem prover too weak. 693 trivial. 0 not checked. [2019-09-05 11:50:11,443 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-05 11:50:11,444 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48] total 49 [2019-09-05 11:50:11,444 INFO L454 AbstractCegarLoop]: Interpolant automaton has 49 states [2019-09-05 11:50:11,444 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2019-09-05 11:50:11,445 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=2234, Unknown=0, NotChecked=0, Total=2352 [2019-09-05 11:50:11,445 INFO L87 Difference]: Start difference. First operand 80 states and 101 transitions. Second operand 49 states. [2019-09-05 11:50:14,116 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 11:50:14,117 INFO L93 Difference]: Finished difference Result 90 states and 113 transitions. [2019-09-05 11:50:14,117 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2019-09-05 11:50:14,117 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 142 [2019-09-05 11:50:14,118 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 11:50:14,119 INFO L225 Difference]: With dead ends: 90 [2019-09-05 11:50:14,119 INFO L226 Difference]: Without dead ends: 85 [2019-09-05 11:50:14,121 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 233 GetRequests, 140 SyntacticMatches, 24 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 255 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=228, Invalid=4742, Unknown=0, NotChecked=0, Total=4970 [2019-09-05 11:50:14,122 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2019-09-05 11:50:14,125 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 83. [2019-09-05 11:50:14,125 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2019-09-05 11:50:14,126 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 105 transitions. [2019-09-05 11:50:14,126 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 105 transitions. Word has length 142 [2019-09-05 11:50:14,127 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 11:50:14,127 INFO L475 AbstractCegarLoop]: Abstraction has 83 states and 105 transitions. [2019-09-05 11:50:14,127 INFO L476 AbstractCegarLoop]: Interpolant automaton has 49 states. [2019-09-05 11:50:14,127 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 105 transitions. [2019-09-05 11:50:14,128 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 149 [2019-09-05 11:50:14,128 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 11:50:14,128 INFO L399 BasicCegarLoop]: trace histogram [23, 23, 23, 23, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 11:50:14,128 INFO L418 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 11:50:14,129 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 11:50:14,129 INFO L82 PathProgramCache]: Analyzing trace with hash 626607594, now seen corresponding path program 23 times [2019-09-05 11:50:14,129 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 11:50:14,129 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 11:50:14,129 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:50:14,130 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 11:50:14,130 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:50:14,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 11:50:15,595 INFO L134 CoverageAnalysis]: Checked inductivity of 1541 backedges. 0 proven. 782 refuted. 0 times theorem prover too weak. 759 trivial. 0 not checked. [2019-09-05 11:50:15,596 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 11:50:15,596 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 11:50:15,605 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2019-09-05 11:54:04,797 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 24 check-sat command(s) [2019-09-05 11:54:04,797 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 11:54:04,886 WARN L254 TraceCheckSpWp]: Trace formula consists of 344 conjuncts, 233 conjunts are in the unsatisfiable core [2019-09-05 11:54:04,889 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 11:54:05,072 INFO L134 CoverageAnalysis]: Checked inductivity of 1541 backedges. 0 proven. 782 refuted. 0 times theorem prover too weak. 759 trivial. 0 not checked. [2019-09-05 11:54:05,078 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-05 11:54:05,079 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50] total 51 [2019-09-05 11:54:05,079 INFO L454 AbstractCegarLoop]: Interpolant automaton has 51 states [2019-09-05 11:54:05,079 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2019-09-05 11:54:05,080 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=2427, Unknown=0, NotChecked=0, Total=2550 [2019-09-05 11:54:05,080 INFO L87 Difference]: Start difference. First operand 83 states and 105 transitions. Second operand 51 states. [2019-09-05 11:54:07,978 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 11:54:07,978 INFO L93 Difference]: Finished difference Result 93 states and 117 transitions. [2019-09-05 11:54:07,979 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2019-09-05 11:54:07,979 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 148 [2019-09-05 11:54:07,979 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 11:54:07,980 INFO L225 Difference]: With dead ends: 93 [2019-09-05 11:54:07,980 INFO L226 Difference]: Without dead ends: 88 [2019-09-05 11:54:07,981 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 243 GetRequests, 146 SyntacticMatches, 25 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 278 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=238, Invalid=5164, Unknown=0, NotChecked=0, Total=5402 [2019-09-05 11:54:07,982 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2019-09-05 11:54:07,985 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 86. [2019-09-05 11:54:07,985 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2019-09-05 11:54:07,986 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 109 transitions. [2019-09-05 11:54:07,986 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 109 transitions. Word has length 148 [2019-09-05 11:54:07,987 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 11:54:07,987 INFO L475 AbstractCegarLoop]: Abstraction has 86 states and 109 transitions. [2019-09-05 11:54:07,987 INFO L476 AbstractCegarLoop]: Interpolant automaton has 51 states. [2019-09-05 11:54:07,987 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 109 transitions. [2019-09-05 11:54:07,988 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 155 [2019-09-05 11:54:07,988 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 11:54:07,988 INFO L399 BasicCegarLoop]: trace histogram [24, 24, 24, 24, 24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 11:54:07,989 INFO L418 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 11:54:07,989 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 11:54:07,989 INFO L82 PathProgramCache]: Analyzing trace with hash -1863509240, now seen corresponding path program 24 times [2019-09-05 11:54:07,989 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 11:54:07,989 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 11:54:07,990 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:54:07,990 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 11:54:07,990 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:54:08,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 11:54:09,332 INFO L134 CoverageAnalysis]: Checked inductivity of 1680 backedges. 0 proven. 852 refuted. 0 times theorem prover too weak. 828 trivial. 0 not checked. [2019-09-05 11:54:09,332 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 11:54:09,332 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 11:54:09,343 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2019-09-05 11:56:41,648 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 25 check-sat command(s) [2019-09-05 11:56:41,649 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 11:56:42,279 WARN L254 TraceCheckSpWp]: Trace formula consists of 358 conjuncts, 243 conjunts are in the unsatisfiable core [2019-09-05 11:56:42,282 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 11:56:42,432 INFO L134 CoverageAnalysis]: Checked inductivity of 1680 backedges. 0 proven. 852 refuted. 0 times theorem prover too weak. 828 trivial. 0 not checked. [2019-09-05 11:56:42,439 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-05 11:56:42,439 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 52] total 53 [2019-09-05 11:56:42,439 INFO L454 AbstractCegarLoop]: Interpolant automaton has 53 states [2019-09-05 11:56:42,439 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2019-09-05 11:56:42,440 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=2628, Unknown=0, NotChecked=0, Total=2756 [2019-09-05 11:56:42,440 INFO L87 Difference]: Start difference. First operand 86 states and 109 transitions. Second operand 53 states. [2019-09-05 11:56:45,603 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 11:56:45,604 INFO L93 Difference]: Finished difference Result 96 states and 121 transitions. [2019-09-05 11:56:45,604 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2019-09-05 11:56:45,604 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 154 [2019-09-05 11:56:45,605 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 11:56:45,606 INFO L225 Difference]: With dead ends: 96 [2019-09-05 11:56:45,606 INFO L226 Difference]: Without dead ends: 91 [2019-09-05 11:56:45,607 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 253 GetRequests, 152 SyntacticMatches, 26 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 302 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=248, Invalid=5604, Unknown=0, NotChecked=0, Total=5852 [2019-09-05 11:56:45,608 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2019-09-05 11:56:45,612 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 89. [2019-09-05 11:56:45,612 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2019-09-05 11:56:45,613 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 113 transitions. [2019-09-05 11:56:45,613 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 113 transitions. Word has length 154 [2019-09-05 11:56:45,613 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 11:56:45,613 INFO L475 AbstractCegarLoop]: Abstraction has 89 states and 113 transitions. [2019-09-05 11:56:45,614 INFO L476 AbstractCegarLoop]: Interpolant automaton has 53 states. [2019-09-05 11:56:45,614 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 113 transitions. [2019-09-05 11:56:45,615 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 161 [2019-09-05 11:56:45,615 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 11:56:45,615 INFO L399 BasicCegarLoop]: trace histogram [25, 25, 25, 25, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 11:56:45,615 INFO L418 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 11:56:45,615 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 11:56:45,615 INFO L82 PathProgramCache]: Analyzing trace with hash -2071453274, now seen corresponding path program 25 times [2019-09-05 11:56:45,616 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 11:56:45,616 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 11:56:45,616 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:56:45,616 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 11:56:45,617 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:56:45,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 11:56:47,166 INFO L134 CoverageAnalysis]: Checked inductivity of 1825 backedges. 0 proven. 925 refuted. 0 times theorem prover too weak. 900 trivial. 0 not checked. [2019-09-05 11:56:47,167 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 11:56:47,167 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 11:56:47,177 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 11:56:47,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 11:56:47,234 WARN L254 TraceCheckSpWp]: Trace formula consists of 372 conjuncts, 253 conjunts are in the unsatisfiable core [2019-09-05 11:56:47,236 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 11:56:47,403 INFO L134 CoverageAnalysis]: Checked inductivity of 1825 backedges. 0 proven. 925 refuted. 0 times theorem prover too weak. 900 trivial. 0 not checked. [2019-09-05 11:56:47,405 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-05 11:56:47,406 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 54] total 55 [2019-09-05 11:56:47,406 INFO L454 AbstractCegarLoop]: Interpolant automaton has 55 states [2019-09-05 11:56:47,406 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2019-09-05 11:56:47,407 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=133, Invalid=2837, Unknown=0, NotChecked=0, Total=2970 [2019-09-05 11:56:47,407 INFO L87 Difference]: Start difference. First operand 89 states and 113 transitions. Second operand 55 states. [2019-09-05 11:56:50,779 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 11:56:50,780 INFO L93 Difference]: Finished difference Result 99 states and 125 transitions. [2019-09-05 11:56:50,780 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2019-09-05 11:56:50,780 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 160 [2019-09-05 11:56:50,781 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 11:56:50,782 INFO L225 Difference]: With dead ends: 99 [2019-09-05 11:56:50,782 INFO L226 Difference]: Without dead ends: 94 [2019-09-05 11:56:50,783 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 263 GetRequests, 158 SyntacticMatches, 27 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 327 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=258, Invalid=6062, Unknown=0, NotChecked=0, Total=6320 [2019-09-05 11:56:50,783 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2019-09-05 11:56:50,786 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 92. [2019-09-05 11:56:50,787 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2019-09-05 11:56:50,788 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 117 transitions. [2019-09-05 11:56:50,788 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 117 transitions. Word has length 160 [2019-09-05 11:56:50,788 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 11:56:50,788 INFO L475 AbstractCegarLoop]: Abstraction has 92 states and 117 transitions. [2019-09-05 11:56:50,788 INFO L476 AbstractCegarLoop]: Interpolant automaton has 55 states. [2019-09-05 11:56:50,788 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 117 transitions. [2019-09-05 11:56:50,789 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 167 [2019-09-05 11:56:50,790 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 11:56:50,790 INFO L399 BasicCegarLoop]: trace histogram [26, 26, 26, 26, 26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 11:56:50,790 INFO L418 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 11:56:50,790 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 11:56:50,790 INFO L82 PathProgramCache]: Analyzing trace with hash 593443268, now seen corresponding path program 26 times [2019-09-05 11:56:50,791 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 11:56:50,791 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 11:56:50,791 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:56:50,791 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 11:56:50,792 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:56:50,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 11:56:52,432 INFO L134 CoverageAnalysis]: Checked inductivity of 1976 backedges. 0 proven. 1001 refuted. 0 times theorem prover too weak. 975 trivial. 0 not checked. [2019-09-05 11:56:52,432 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 11:56:52,432 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 11:56:52,442 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2019-09-05 11:56:52,500 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-09-05 11:56:52,500 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 11:56:52,504 WARN L254 TraceCheckSpWp]: Trace formula consists of 386 conjuncts, 263 conjunts are in the unsatisfiable core [2019-09-05 11:56:52,507 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 11:56:52,736 INFO L134 CoverageAnalysis]: Checked inductivity of 1976 backedges. 0 proven. 1001 refuted. 0 times theorem prover too weak. 975 trivial. 0 not checked. [2019-09-05 11:56:52,749 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-05 11:56:52,749 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 56] total 57 [2019-09-05 11:56:52,750 INFO L454 AbstractCegarLoop]: Interpolant automaton has 57 states [2019-09-05 11:56:52,750 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2019-09-05 11:56:52,751 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=3054, Unknown=0, NotChecked=0, Total=3192 [2019-09-05 11:56:52,751 INFO L87 Difference]: Start difference. First operand 92 states and 117 transitions. Second operand 57 states. [2019-09-05 11:56:56,524 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 11:56:56,524 INFO L93 Difference]: Finished difference Result 102 states and 129 transitions. [2019-09-05 11:56:56,525 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2019-09-05 11:56:56,525 INFO L78 Accepts]: Start accepts. Automaton has 57 states. Word has length 166 [2019-09-05 11:56:56,525 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 11:56:56,526 INFO L225 Difference]: With dead ends: 102 [2019-09-05 11:56:56,526 INFO L226 Difference]: Without dead ends: 97 [2019-09-05 11:56:56,527 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 273 GetRequests, 164 SyntacticMatches, 28 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 353 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=268, Invalid=6538, Unknown=0, NotChecked=0, Total=6806 [2019-09-05 11:56:56,527 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2019-09-05 11:56:56,531 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 95. [2019-09-05 11:56:56,531 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2019-09-05 11:56:56,532 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 121 transitions. [2019-09-05 11:56:56,533 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 121 transitions. Word has length 166 [2019-09-05 11:56:56,533 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 11:56:56,533 INFO L475 AbstractCegarLoop]: Abstraction has 95 states and 121 transitions. [2019-09-05 11:56:56,533 INFO L476 AbstractCegarLoop]: Interpolant automaton has 57 states. [2019-09-05 11:56:56,533 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 121 transitions. [2019-09-05 11:56:56,534 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 173 [2019-09-05 11:56:56,534 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 11:56:56,535 INFO L399 BasicCegarLoop]: trace histogram [27, 27, 27, 27, 27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 11:56:56,535 INFO L418 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 11:56:56,535 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 11:56:56,535 INFO L82 PathProgramCache]: Analyzing trace with hash -847297694, now seen corresponding path program 27 times [2019-09-05 11:56:56,535 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 11:56:56,536 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 11:56:56,536 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:56:56,536 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 11:56:56,536 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:56:56,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 11:56:58,330 INFO L134 CoverageAnalysis]: Checked inductivity of 2133 backedges. 0 proven. 1080 refuted. 0 times theorem prover too weak. 1053 trivial. 0 not checked. [2019-09-05 11:56:58,331 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 11:56:58,331 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 11:56:58,343 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2