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/nested_1-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-c6af20d [2019-09-03 19:35:20,555 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-09-03 19:35:20,558 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-09-03 19:35:20,575 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2019-09-03 19:35:20,594 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-09-03 19:35:20,595 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-09-03 19:35:20,596 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-09-03 19:35:20,597 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-09-03 19:35:20,598 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-09-03 19:35:20,599 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-09-03 19:35:20,600 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-09-03 19:35:20,602 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-09-03 19:35:20,603 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-09-03 19:35:20,604 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-09-03 19:35:20,605 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-09-03 19:35:20,605 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-09-03 19:35:20,607 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-09-03 19:35:20,614 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-09-03 19:35:20,615 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-09-03 19:35:20,615 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-09-03 19:35:20,616 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 [2019-09-03 19:35:20,629 INFO L113 SettingsManager]: Loading preferences was successful [2019-09-03 19:35:20,630 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-09-03 19:35:20,631 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-09-03 19:35:20,631 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-09-03 19:35:20,631 INFO L138 SettingsManager]: * Use SBE=true [2019-09-03 19:35:20,631 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-09-03 19:35:20,632 INFO L138 SettingsManager]: * sizeof long=4 [2019-09-03 19:35:20,632 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-09-03 19:35:20,632 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-09-03 19:35:20,632 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-09-03 19:35:20,632 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-09-03 19:35:20,633 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-09-03 19:35:20,633 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-09-03 19:35:20,633 INFO L138 SettingsManager]: * sizeof long double=12 [2019-09-03 19:35:20,633 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-09-03 19:35:20,633 INFO L138 SettingsManager]: * Use constant arrays=true [2019-09-03 19:35:20,633 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-09-03 19:35:20,634 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-09-03 19:35:20,634 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-09-03 19:35:20,634 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-09-03 19:35:20,634 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-09-03 19:35:20,634 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-09-03 19:35:20,635 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-09-03 19:35:20,635 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-09-03 19:35:20,635 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-09-03 19:35:20,635 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-09-03 19:35:20,635 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-09-03 19:35:20,636 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-09-03 19:35:20,636 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-09-03 19:35:20,663 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-09-03 19:35:20,675 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-09-03 19:35:20,679 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-09-03 19:35:20,680 INFO L271 PluginConnector]: Initializing CDTParser... [2019-09-03 19:35:20,680 INFO L275 PluginConnector]: CDTParser initialized [2019-09-03 19:35:20,681 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/nested_1-2.c [2019-09-03 19:35:20,747 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3168f794c/a0a21dfc35604c3eaa70d10c44bbe184/FLAG0a2c8a2cd [2019-09-03 19:35:21,226 INFO L306 CDTParser]: Found 1 translation units. [2019-09-03 19:35:21,226 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/nested_1-2.c [2019-09-03 19:35:21,231 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3168f794c/a0a21dfc35604c3eaa70d10c44bbe184/FLAG0a2c8a2cd [2019-09-03 19:35:21,658 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3168f794c/a0a21dfc35604c3eaa70d10c44bbe184 [2019-09-03 19:35:21,670 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-09-03 19:35:21,672 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-09-03 19:35:21,672 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-09-03 19:35:21,672 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-09-03 19:35:21,676 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-09-03 19:35:21,677 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.09 07:35:21" (1/1) ... [2019-09-03 19:35:21,679 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4083eb64 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 07:35:21, skipping insertion in model container [2019-09-03 19:35:21,679 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.09 07:35:21" (1/1) ... [2019-09-03 19:35:21,687 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-09-03 19:35:21,707 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-09-03 19:35:21,886 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-09-03 19:35:21,896 INFO L188 MainTranslator]: Completed pre-run [2019-09-03 19:35:21,910 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-09-03 19:35:21,924 INFO L192 MainTranslator]: Completed translation [2019-09-03 19:35:21,924 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 07:35:21 WrapperNode [2019-09-03 19:35:21,924 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-09-03 19:35:21,925 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-09-03 19:35:21,925 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-09-03 19:35:21,926 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-09-03 19:35:22,028 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 07:35:21" (1/1) ... [2019-09-03 19:35:22,028 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 07:35:21" (1/1) ... [2019-09-03 19:35:22,032 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 07:35:21" (1/1) ... [2019-09-03 19:35:22,033 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 07:35:21" (1/1) ... [2019-09-03 19:35:22,036 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 07:35:21" (1/1) ... [2019-09-03 19:35:22,040 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 07:35:21" (1/1) ... [2019-09-03 19:35:22,041 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 07:35:21" (1/1) ... [2019-09-03 19:35:22,046 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-09-03 19:35:22,046 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-09-03 19:35:22,046 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-09-03 19:35:22,047 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-09-03 19:35:22,048 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 07:35:21" (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 [2019-09-03 19:35:22,099 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-09-03 19:35:22,099 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-09-03 19:35:22,099 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-09-03 19:35:22,099 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-09-03 19:35:22,100 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-09-03 19:35:22,100 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-09-03 19:35:22,100 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-09-03 19:35:22,100 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-09-03 19:35:22,100 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-09-03 19:35:22,268 INFO L278 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-09-03 19:35:22,268 INFO L283 CfgBuilder]: Removed 2 assume(true) statements. [2019-09-03 19:35:22,269 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.09 07:35:22 BoogieIcfgContainer [2019-09-03 19:35:22,270 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-09-03 19:35:22,270 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-09-03 19:35:22,270 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-09-03 19:35:22,273 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-09-03 19:35:22,274 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 03.09 07:35:21" (1/3) ... [2019-09-03 19:35:22,274 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7c374ff5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.09 07:35:22, skipping insertion in model container [2019-09-03 19:35:22,275 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 07:35:21" (2/3) ... [2019-09-03 19:35:22,275 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7c374ff5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.09 07:35:22, skipping insertion in model container [2019-09-03 19:35:22,275 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.09 07:35:22" (3/3) ... [2019-09-03 19:35:22,277 INFO L109 eAbstractionObserver]: Analyzing ICFG nested_1-2.c [2019-09-03 19:35:22,287 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-09-03 19:35:22,293 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-09-03 19:35:22,308 INFO L252 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-09-03 19:35:22,333 INFO L128 ementStrategyFactory]: Using default assertion order modulation [2019-09-03 19:35:22,333 INFO L377 AbstractCegarLoop]: Interprodecural is true [2019-09-03 19:35:22,334 INFO L378 AbstractCegarLoop]: Hoare is true [2019-09-03 19:35:22,334 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-09-03 19:35:22,334 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-09-03 19:35:22,334 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-09-03 19:35:22,334 INFO L382 AbstractCegarLoop]: Difference is false [2019-09-03 19:35:22,334 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-09-03 19:35:22,334 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-09-03 19:35:22,348 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states. [2019-09-03 19:35:22,352 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2019-09-03 19:35:22,352 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 19:35:22,353 INFO L399 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 19:35:22,355 INFO L418 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 19:35:22,359 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 19:35:22,359 INFO L82 PathProgramCache]: Analyzing trace with hash -873786703, now seen corresponding path program 1 times [2019-09-03 19:35:22,360 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-03 19:35:22,361 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-03 19:35:22,397 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:35:22,397 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 19:35:22,397 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:35:22,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 19:35:22,568 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 19:35:22,571 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-09-03 19:35:22,572 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-09-03 19:35:22,577 INFO L454 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-09-03 19:35:22,596 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-09-03 19:35:22,597 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-09-03 19:35:22,600 INFO L87 Difference]: Start difference. First operand 19 states. Second operand 3 states. [2019-09-03 19:35:22,652 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 19:35:22,652 INFO L93 Difference]: Finished difference Result 36 states and 49 transitions. [2019-09-03 19:35:22,653 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-09-03 19:35:22,654 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2019-09-03 19:35:22,655 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 19:35:22,662 INFO L225 Difference]: With dead ends: 36 [2019-09-03 19:35:22,662 INFO L226 Difference]: Without dead ends: 16 [2019-09-03 19:35:22,665 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 [2019-09-03 19:35:22,690 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2019-09-03 19:35:22,706 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 14. [2019-09-03 19:35:22,707 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2019-09-03 19:35:22,708 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2019-09-03 19:35:22,710 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 10 [2019-09-03 19:35:22,710 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 19:35:22,710 INFO L475 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2019-09-03 19:35:22,710 INFO L476 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-09-03 19:35:22,711 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2019-09-03 19:35:22,711 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2019-09-03 19:35:22,711 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 19:35:22,712 INFO L399 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 19:35:22,712 INFO L418 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 19:35:22,713 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 19:35:22,713 INFO L82 PathProgramCache]: Analyzing trace with hash 1621360120, now seen corresponding path program 1 times [2019-09-03 19:35:22,713 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-03 19:35:22,713 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-03 19:35:22,714 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:35:22,714 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 19:35:22,715 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:35:22,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 19:35:22,810 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 19:35:22,811 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-09-03 19:35:22,811 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-09-03 19:35:22,813 INFO L454 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-09-03 19:35:22,813 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-09-03 19:35:22,814 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-09-03 19:35:22,814 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand 3 states. [2019-09-03 19:35:22,828 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 19:35:22,828 INFO L93 Difference]: Finished difference Result 23 states and 26 transitions. [2019-09-03 19:35:22,829 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-09-03 19:35:22,829 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 13 [2019-09-03 19:35:22,829 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 19:35:22,830 INFO L225 Difference]: With dead ends: 23 [2019-09-03 19:35:22,830 INFO L226 Difference]: Without dead ends: 15 [2019-09-03 19:35:22,831 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-09-03 19:35:22,831 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2019-09-03 19:35:22,834 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2019-09-03 19:35:22,835 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2019-09-03 19:35:22,835 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2019-09-03 19:35:22,836 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 13 [2019-09-03 19:35:22,836 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 19:35:22,836 INFO L475 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2019-09-03 19:35:22,836 INFO L476 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-09-03 19:35:22,837 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2019-09-03 19:35:22,837 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2019-09-03 19:35:22,837 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 19:35:22,838 INFO L399 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 19:35:22,838 INFO L418 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 19:35:22,838 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 19:35:22,838 INFO L82 PathProgramCache]: Analyzing trace with hash 1574756514, now seen corresponding path program 1 times [2019-09-03 19:35:22,838 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-03 19:35:22,839 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-03 19:35:22,839 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:35:22,840 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 19:35:22,840 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:35:22,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 19:35:22,921 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 19:35:22,921 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 19:35:22,921 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) [2019-09-03 19:35:22,942 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-03 19:35:22,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 19:35:22,971 INFO L256 TraceCheckSpWp]: Trace formula consists of 33 conjuncts, 9 conjunts are in the unsatisfiable core [2019-09-03 19:35:22,976 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 19:35:23,014 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 19:35:23,018 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-03 19:35:23,019 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5] total 7 [2019-09-03 19:35:23,019 INFO L454 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-09-03 19:35:23,019 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-09-03 19:35:23,020 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2019-09-03 19:35:23,021 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand 7 states. [2019-09-03 19:35:23,135 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 19:35:23,135 INFO L93 Difference]: Finished difference Result 34 states and 42 transitions. [2019-09-03 19:35:23,136 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-09-03 19:35:23,136 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 14 [2019-09-03 19:35:23,136 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 19:35:23,137 INFO L225 Difference]: With dead ends: 34 [2019-09-03 19:35:23,137 INFO L226 Difference]: Without dead ends: 25 [2019-09-03 19:35:23,138 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2019-09-03 19:35:23,138 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2019-09-03 19:35:23,143 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 21. [2019-09-03 19:35:23,143 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2019-09-03 19:35:23,144 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2019-09-03 19:35:23,144 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 14 [2019-09-03 19:35:23,144 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 19:35:23,145 INFO L475 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2019-09-03 19:35:23,145 INFO L476 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-09-03 19:35:23,145 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2019-09-03 19:35:23,145 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2019-09-03 19:35:23,146 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 19:35:23,146 INFO L399 BasicCegarLoop]: trace histogram [4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 19:35:23,146 INFO L418 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 19:35:23,146 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 19:35:23,146 INFO L82 PathProgramCache]: Analyzing trace with hash 93409041, now seen corresponding path program 2 times [2019-09-03 19:35:23,146 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-03 19:35:23,147 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-03 19:35:23,148 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:35:23,149 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 19:35:23,149 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:35:23,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 19:35:23,258 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 11 proven. 3 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2019-09-03 19:35:23,259 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 19:35:23,259 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) [2019-09-03 19:35:23,283 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-03 19:35:23,308 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-09-03 19:35:23,309 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-03 19:35:23,310 INFO L256 TraceCheckSpWp]: Trace formula consists of 48 conjuncts, 7 conjunts are in the unsatisfiable core [2019-09-03 19:35:23,311 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 19:35:23,345 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-09-03 19:35:23,349 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-03 19:35:23,350 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 8 [2019-09-03 19:35:23,350 INFO L454 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-09-03 19:35:23,350 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-09-03 19:35:23,351 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2019-09-03 19:35:23,351 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand 8 states. [2019-09-03 19:35:23,609 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 19:35:23,610 INFO L93 Difference]: Finished difference Result 46 states and 56 transitions. [2019-09-03 19:35:23,610 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-09-03 19:35:23,611 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 20 [2019-09-03 19:35:23,611 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 19:35:23,612 INFO L225 Difference]: With dead ends: 46 [2019-09-03 19:35:23,612 INFO L226 Difference]: Without dead ends: 34 [2019-09-03 19:35:23,613 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2019-09-03 19:35:23,614 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2019-09-03 19:35:23,620 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 29. [2019-09-03 19:35:23,620 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2019-09-03 19:35:23,621 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 32 transitions. [2019-09-03 19:35:23,621 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 32 transitions. Word has length 20 [2019-09-03 19:35:23,622 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 19:35:23,622 INFO L475 AbstractCegarLoop]: Abstraction has 29 states and 32 transitions. [2019-09-03 19:35:23,622 INFO L476 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-09-03 19:35:23,622 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 32 transitions. [2019-09-03 19:35:23,623 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2019-09-03 19:35:23,623 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 19:35:23,623 INFO L399 BasicCegarLoop]: trace histogram [9, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 19:35:23,623 INFO L418 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 19:35:23,624 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 19:35:23,624 INFO L82 PathProgramCache]: Analyzing trace with hash 50981508, now seen corresponding path program 3 times [2019-09-03 19:35:23,624 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-03 19:35:23,624 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-03 19:35:23,625 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:35:23,625 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-03 19:35:23,625 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:35:23,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 19:35:23,743 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 35 proven. 6 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2019-09-03 19:35:23,743 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 19:35:23,743 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) [2019-09-03 19:35:23,760 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-03 19:35:23,787 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2019-09-03 19:35:23,787 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-03 19:35:23,788 INFO L256 TraceCheckSpWp]: Trace formula consists of 54 conjuncts, 9 conjunts are in the unsatisfiable core [2019-09-03 19:35:23,790 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 19:35:23,826 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 37 proven. 6 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2019-09-03 19:35:23,830 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-03 19:35:23,830 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 7 [2019-09-03 19:35:23,830 INFO L454 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-09-03 19:35:23,831 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-09-03 19:35:23,831 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2019-09-03 19:35:23,831 INFO L87 Difference]: Start difference. First operand 29 states and 32 transitions. Second operand 7 states. [2019-09-03 19:35:23,870 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 19:35:23,870 INFO L93 Difference]: Finished difference Result 51 states and 59 transitions. [2019-09-03 19:35:23,871 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-09-03 19:35:23,871 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 28 [2019-09-03 19:35:23,871 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 19:35:23,872 INFO L225 Difference]: With dead ends: 51 [2019-09-03 19:35:23,872 INFO L226 Difference]: Without dead ends: 32 [2019-09-03 19:35:23,873 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 27 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2019-09-03 19:35:23,873 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2019-09-03 19:35:23,878 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2019-09-03 19:35:23,879 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2019-09-03 19:35:23,880 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 35 transitions. [2019-09-03 19:35:23,880 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 35 transitions. Word has length 28 [2019-09-03 19:35:23,880 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 19:35:23,880 INFO L475 AbstractCegarLoop]: Abstraction has 32 states and 35 transitions. [2019-09-03 19:35:23,880 INFO L476 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-09-03 19:35:23,880 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 35 transitions. [2019-09-03 19:35:23,881 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2019-09-03 19:35:23,881 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 19:35:23,881 INFO L399 BasicCegarLoop]: trace histogram [12, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 19:35:23,882 INFO L418 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 19:35:23,882 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 19:35:23,882 INFO L82 PathProgramCache]: Analyzing trace with hash 1418818136, now seen corresponding path program 4 times [2019-09-03 19:35:23,882 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-03 19:35:23,882 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-03 19:35:23,883 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:35:23,883 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-03 19:35:23,884 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:35:23,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 19:35:23,992 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 53 proven. 10 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2019-09-03 19:35:23,992 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 19:35:23,993 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) [2019-09-03 19:35:24,017 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 [2019-09-03 19:35:24,037 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-09-03 19:35:24,037 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-03 19:35:24,039 INFO L256 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 18 conjunts are in the unsatisfiable core [2019-09-03 19:35:24,041 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 19:35:24,156 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 94 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2019-09-03 19:35:24,159 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-03 19:35:24,160 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 10] total 15 [2019-09-03 19:35:24,160 INFO L454 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-09-03 19:35:24,161 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-09-03 19:35:24,161 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=167, Unknown=0, NotChecked=0, Total=210 [2019-09-03 19:35:24,161 INFO L87 Difference]: Start difference. First operand 32 states and 35 transitions. Second operand 15 states. [2019-09-03 19:35:24,588 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 19:35:24,589 INFO L93 Difference]: Finished difference Result 71 states and 84 transitions. [2019-09-03 19:35:24,589 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2019-09-03 19:35:24,589 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 31 [2019-09-03 19:35:24,590 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 19:35:24,590 INFO L225 Difference]: With dead ends: 71 [2019-09-03 19:35:24,591 INFO L226 Difference]: Without dead ends: 50 [2019-09-03 19:35:24,592 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 214 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=135, Invalid=795, Unknown=0, NotChecked=0, Total=930 [2019-09-03 19:35:24,592 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2019-09-03 19:35:24,599 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 43. [2019-09-03 19:35:24,599 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2019-09-03 19:35:24,600 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 47 transitions. [2019-09-03 19:35:24,601 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 47 transitions. Word has length 31 [2019-09-03 19:35:24,601 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 19:35:24,601 INFO L475 AbstractCegarLoop]: Abstraction has 43 states and 47 transitions. [2019-09-03 19:35:24,601 INFO L476 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-09-03 19:35:24,602 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 47 transitions. [2019-09-03 19:35:24,603 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2019-09-03 19:35:24,603 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 19:35:24,603 INFO L399 BasicCegarLoop]: trace histogram [20, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 19:35:24,603 INFO L418 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 19:35:24,604 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 19:35:24,604 INFO L82 PathProgramCache]: Analyzing trace with hash -1949427083, now seen corresponding path program 5 times [2019-09-03 19:35:24,604 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-03 19:35:24,604 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-03 19:35:24,606 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:35:24,607 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-03 19:35:24,607 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:35:24,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 19:35:24,804 INFO L134 CoverageAnalysis]: Checked inductivity of 292 backedges. 112 proven. 15 refuted. 0 times theorem prover too weak. 165 trivial. 0 not checked. [2019-09-03 19:35:24,805 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 19:35:24,805 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) [2019-09-03 19:35:24,818 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-03 19:35:24,867 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2019-09-03 19:35:24,867 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-03 19:35:24,871 INFO L256 TraceCheckSpWp]: Trace formula consists of 38 conjuncts, 13 conjunts are in the unsatisfiable core [2019-09-03 19:35:24,874 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 19:35:24,913 INFO L134 CoverageAnalysis]: Checked inductivity of 292 backedges. 189 proven. 15 refuted. 0 times theorem prover too weak. 88 trivial. 0 not checked. [2019-09-03 19:35:24,917 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-03 19:35:24,917 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 9 [2019-09-03 19:35:24,918 INFO L454 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-09-03 19:35:24,918 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-09-03 19:35:24,920 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2019-09-03 19:35:24,920 INFO L87 Difference]: Start difference. First operand 43 states and 47 transitions. Second operand 9 states. [2019-09-03 19:35:24,975 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 19:35:24,975 INFO L93 Difference]: Finished difference Result 78 states and 89 transitions. [2019-09-03 19:35:24,978 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-09-03 19:35:24,979 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 42 [2019-09-03 19:35:24,980 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 19:35:24,981 INFO L225 Difference]: With dead ends: 78 [2019-09-03 19:35:24,981 INFO L226 Difference]: Without dead ends: 47 [2019-09-03 19:35:24,982 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 41 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2019-09-03 19:35:24,982 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2019-09-03 19:35:24,995 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2019-09-03 19:35:24,996 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2019-09-03 19:35:24,997 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 51 transitions. [2019-09-03 19:35:24,997 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 51 transitions. Word has length 42 [2019-09-03 19:35:24,997 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 19:35:24,997 INFO L475 AbstractCegarLoop]: Abstraction has 47 states and 51 transitions. [2019-09-03 19:35:24,997 INFO L476 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-09-03 19:35:24,998 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 51 transitions. [2019-09-03 19:35:25,002 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2019-09-03 19:35:25,003 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 19:35:25,003 INFO L399 BasicCegarLoop]: trace histogram [24, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 19:35:25,004 INFO L418 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 19:35:25,005 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 19:35:25,005 INFO L82 PathProgramCache]: Analyzing trace with hash -649475471, now seen corresponding path program 6 times [2019-09-03 19:35:25,005 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-03 19:35:25,005 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-03 19:35:25,006 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:35:25,007 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-03 19:35:25,007 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:35:25,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 19:35:25,177 INFO L134 CoverageAnalysis]: Checked inductivity of 394 backedges. 151 proven. 21 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2019-09-03 19:35:25,177 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 19:35:25,178 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 [2019-09-03 19:35:25,198 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2019-09-03 19:35:25,342 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 8 check-sat command(s) [2019-09-03 19:35:25,343 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-03 19:35:25,343 INFO L256 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 15 conjunts are in the unsatisfiable core [2019-09-03 19:35:25,345 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 19:35:25,375 INFO L134 CoverageAnalysis]: Checked inductivity of 394 backedges. 254 proven. 21 refuted. 0 times theorem prover too weak. 119 trivial. 0 not checked. [2019-09-03 19:35:25,378 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-03 19:35:25,378 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 10 [2019-09-03 19:35:25,382 INFO L454 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-09-03 19:35:25,382 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-09-03 19:35:25,383 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2019-09-03 19:35:25,383 INFO L87 Difference]: Start difference. First operand 47 states and 51 transitions. Second operand 10 states. [2019-09-03 19:35:25,458 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 19:35:25,458 INFO L93 Difference]: Finished difference Result 85 states and 96 transitions. [2019-09-03 19:35:25,459 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-09-03 19:35:25,459 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 46 [2019-09-03 19:35:25,459 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 19:35:25,460 INFO L225 Difference]: With dead ends: 85 [2019-09-03 19:35:25,460 INFO L226 Difference]: Without dead ends: 51 [2019-09-03 19:35:25,461 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 45 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2019-09-03 19:35:25,461 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2019-09-03 19:35:25,474 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2019-09-03 19:35:25,474 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2019-09-03 19:35:25,476 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 55 transitions. [2019-09-03 19:35:25,476 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 55 transitions. Word has length 46 [2019-09-03 19:35:25,478 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 19:35:25,478 INFO L475 AbstractCegarLoop]: Abstraction has 51 states and 55 transitions. [2019-09-03 19:35:25,478 INFO L476 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-09-03 19:35:25,479 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 55 transitions. [2019-09-03 19:35:25,481 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2019-09-03 19:35:25,481 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 19:35:25,482 INFO L399 BasicCegarLoop]: trace histogram [28, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 19:35:25,482 INFO L418 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 19:35:25,484 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 19:35:25,484 INFO L82 PathProgramCache]: Analyzing trace with hash -1892649995, now seen corresponding path program 7 times [2019-09-03 19:35:25,484 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-03 19:35:25,484 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-03 19:35:25,489 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:35:25,489 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-03 19:35:25,490 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:35:25,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 19:35:25,653 INFO L134 CoverageAnalysis]: Checked inductivity of 512 backedges. 196 proven. 28 refuted. 0 times theorem prover too weak. 288 trivial. 0 not checked. [2019-09-03 19:35:25,654 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 19:35:25,654 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-03 19:35:25,674 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 19:35:25,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 19:35:25,702 INFO L256 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 22 conjunts are in the unsatisfiable core [2019-09-03 19:35:25,707 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 19:35:25,876 INFO L134 CoverageAnalysis]: Checked inductivity of 512 backedges. 0 proven. 425 refuted. 0 times theorem prover too weak. 87 trivial. 0 not checked. [2019-09-03 19:35:25,880 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-03 19:35:25,881 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 12] total 20 [2019-09-03 19:35:25,881 INFO L454 AbstractCegarLoop]: Interpolant automaton has 20 states [2019-09-03 19:35:25,881 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2019-09-03 19:35:25,882 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=321, Unknown=0, NotChecked=0, Total=380 [2019-09-03 19:35:25,882 INFO L87 Difference]: Start difference. First operand 51 states and 55 transitions. Second operand 20 states. [2019-09-03 19:35:26,763 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 19:35:26,764 INFO L93 Difference]: Finished difference Result 113 states and 129 transitions. [2019-09-03 19:35:26,764 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2019-09-03 19:35:26,764 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 50 [2019-09-03 19:35:26,765 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 19:35:26,766 INFO L225 Difference]: With dead ends: 113 [2019-09-03 19:35:26,766 INFO L226 Difference]: Without dead ends: 76 [2019-09-03 19:35:26,768 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 815 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=264, Invalid=2706, Unknown=0, NotChecked=0, Total=2970 [2019-09-03 19:35:26,768 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2019-09-03 19:35:26,776 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 66. [2019-09-03 19:35:26,776 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2019-09-03 19:35:26,777 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 71 transitions. [2019-09-03 19:35:26,778 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 71 transitions. Word has length 50 [2019-09-03 19:35:26,778 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 19:35:26,778 INFO L475 AbstractCegarLoop]: Abstraction has 66 states and 71 transitions. [2019-09-03 19:35:26,778 INFO L476 AbstractCegarLoop]: Interpolant automaton has 20 states. [2019-09-03 19:35:26,778 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 71 transitions. [2019-09-03 19:35:26,779 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2019-09-03 19:35:26,779 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 19:35:26,779 INFO L399 BasicCegarLoop]: trace histogram [40, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 19:35:26,780 INFO L418 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 19:35:26,780 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 19:35:26,780 INFO L82 PathProgramCache]: Analyzing trace with hash 1564944312, now seen corresponding path program 8 times [2019-09-03 19:35:26,780 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-03 19:35:26,780 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-03 19:35:26,781 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:35:26,781 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 19:35:26,781 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:35:26,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 19:35:26,924 INFO L134 CoverageAnalysis]: Checked inductivity of 1015 backedges. 329 proven. 36 refuted. 0 times theorem prover too weak. 650 trivial. 0 not checked. [2019-09-03 19:35:26,924 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 19:35:26,924 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-03 19:35:26,947 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2019-09-03 19:35:26,981 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-09-03 19:35:26,981 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-03 19:35:26,983 INFO L256 TraceCheckSpWp]: Trace formula consists of 174 conjuncts, 26 conjunts are in the unsatisfiable core [2019-09-03 19:35:26,986 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 19:35:27,207 INFO L134 CoverageAnalysis]: Checked inductivity of 1015 backedges. 0 proven. 868 refuted. 0 times theorem prover too weak. 147 trivial. 0 not checked. [2019-09-03 19:35:27,217 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-03 19:35:27,217 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 14] total 23 [2019-09-03 19:35:27,217 INFO L454 AbstractCegarLoop]: Interpolant automaton has 23 states [2019-09-03 19:35:27,218 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2019-09-03 19:35:27,221 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=437, Unknown=0, NotChecked=0, Total=506 [2019-09-03 19:35:27,221 INFO L87 Difference]: Start difference. First operand 66 states and 71 transitions. Second operand 23 states. [2019-09-03 19:35:28,671 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 19:35:28,671 INFO L93 Difference]: Finished difference Result 145 states and 164 transitions. [2019-09-03 19:35:28,672 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2019-09-03 19:35:28,672 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 65 [2019-09-03 19:35:28,672 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 19:35:28,673 INFO L225 Difference]: With dead ends: 145 [2019-09-03 19:35:28,673 INFO L226 Difference]: Without dead ends: 94 [2019-09-03 19:35:28,676 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1479 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=351, Invalid=4619, Unknown=0, NotChecked=0, Total=4970 [2019-09-03 19:35:28,677 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2019-09-03 19:35:28,686 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 83. [2019-09-03 19:35:28,686 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2019-09-03 19:35:28,687 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 89 transitions. [2019-09-03 19:35:28,688 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 89 transitions. Word has length 65 [2019-09-03 19:35:28,688 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 19:35:28,688 INFO L475 AbstractCegarLoop]: Abstraction has 83 states and 89 transitions. [2019-09-03 19:35:28,688 INFO L476 AbstractCegarLoop]: Interpolant automaton has 23 states. [2019-09-03 19:35:28,688 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 89 transitions. [2019-09-03 19:35:28,689 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2019-09-03 19:35:28,689 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 19:35:28,690 INFO L399 BasicCegarLoop]: trace histogram [54, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 19:35:28,690 INFO L418 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 19:35:28,690 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 19:35:28,690 INFO L82 PathProgramCache]: Analyzing trace with hash 1497018839, now seen corresponding path program 9 times [2019-09-03 19:35:28,690 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-03 19:35:28,690 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-03 19:35:28,691 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:35:28,691 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-03 19:35:28,691 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:35:28,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 19:35:28,853 INFO L134 CoverageAnalysis]: Checked inductivity of 1806 backedges. 506 proven. 45 refuted. 0 times theorem prover too weak. 1255 trivial. 0 not checked. [2019-09-03 19:35:28,854 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 19:35:28,854 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 [2019-09-03 19:35:28,864 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-09-03 19:35:29,459 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2019-09-03 19:35:29,459 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-03 19:35:29,462 INFO L256 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 21 conjunts are in the unsatisfiable core [2019-09-03 19:35:29,465 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 19:35:29,520 INFO L134 CoverageAnalysis]: Checked inductivity of 1806 backedges. 511 proven. 45 refuted. 0 times theorem prover too weak. 1250 trivial. 0 not checked. [2019-09-03 19:35:29,528 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-03 19:35:29,528 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 13 [2019-09-03 19:35:29,529 INFO L454 AbstractCegarLoop]: Interpolant automaton has 13 states [2019-09-03 19:35:29,529 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2019-09-03 19:35:29,529 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2019-09-03 19:35:29,529 INFO L87 Difference]: Start difference. First operand 83 states and 89 transitions. Second operand 13 states. [2019-09-03 19:35:29,630 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 19:35:29,631 INFO L93 Difference]: Finished difference Result 156 states and 173 transitions. [2019-09-03 19:35:29,631 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-09-03 19:35:29,631 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 82 [2019-09-03 19:35:29,631 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 19:35:29,632 INFO L225 Difference]: With dead ends: 156 [2019-09-03 19:35:29,632 INFO L226 Difference]: Without dead ends: 89 [2019-09-03 19:35:29,633 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 81 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2019-09-03 19:35:29,633 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2019-09-03 19:35:29,642 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 89. [2019-09-03 19:35:29,643 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2019-09-03 19:35:29,644 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 95 transitions. [2019-09-03 19:35:29,644 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 95 transitions. Word has length 82 [2019-09-03 19:35:29,644 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 19:35:29,644 INFO L475 AbstractCegarLoop]: Abstraction has 89 states and 95 transitions. [2019-09-03 19:35:29,644 INFO L476 AbstractCegarLoop]: Interpolant automaton has 13 states. [2019-09-03 19:35:29,644 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 95 transitions. [2019-09-03 19:35:29,645 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2019-09-03 19:35:29,645 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 19:35:29,645 INFO L399 BasicCegarLoop]: trace histogram [60, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 19:35:29,646 INFO L418 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 19:35:29,646 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 19:35:29,646 INFO L82 PathProgramCache]: Analyzing trace with hash 642319569, now seen corresponding path program 10 times [2019-09-03 19:35:29,646 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-03 19:35:29,646 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-03 19:35:29,647 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:35:29,647 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-03 19:35:29,647 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:35:29,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 19:35:29,793 INFO L134 CoverageAnalysis]: Checked inductivity of 2181 backedges. 0 proven. 1851 refuted. 0 times theorem prover too weak. 330 trivial. 0 not checked. [2019-09-03 19:35:29,793 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 19:35:29,793 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) [2019-09-03 19:35:29,837 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 [2019-09-03 19:35:29,880 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-09-03 19:35:29,880 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-03 19:35:29,881 INFO L256 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 30 conjunts are in the unsatisfiable core [2019-09-03 19:35:29,884 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 19:35:30,037 INFO L134 CoverageAnalysis]: Checked inductivity of 2181 backedges. 0 proven. 1900 refuted. 0 times theorem prover too weak. 281 trivial. 0 not checked. [2019-09-03 19:35:30,041 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-03 19:35:30,041 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 16] total 17 [2019-09-03 19:35:30,042 INFO L454 AbstractCegarLoop]: Interpolant automaton has 17 states [2019-09-03 19:35:30,042 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2019-09-03 19:35:30,042 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=220, Unknown=0, NotChecked=0, Total=272 [2019-09-03 19:35:30,042 INFO L87 Difference]: Start difference. First operand 89 states and 95 transitions. Second operand 17 states. [2019-09-03 19:35:30,220 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 19:35:30,221 INFO L93 Difference]: Finished difference Result 119 states and 127 transitions. [2019-09-03 19:35:30,221 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2019-09-03 19:35:30,221 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 88 [2019-09-03 19:35:30,222 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 19:35:30,223 INFO L225 Difference]: With dead ends: 119 [2019-09-03 19:35:30,223 INFO L226 Difference]: Without dead ends: 114 [2019-09-03 19:35:30,224 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 80 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=52, Invalid=220, Unknown=0, NotChecked=0, Total=272 [2019-09-03 19:35:30,224 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2019-09-03 19:35:30,248 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 102. [2019-09-03 19:35:30,248 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102 states. [2019-09-03 19:35:30,249 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 109 transitions. [2019-09-03 19:35:30,250 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 109 transitions. Word has length 88 [2019-09-03 19:35:30,250 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 19:35:30,250 INFO L475 AbstractCegarLoop]: Abstraction has 102 states and 109 transitions. [2019-09-03 19:35:30,250 INFO L476 AbstractCegarLoop]: Interpolant automaton has 17 states. [2019-09-03 19:35:30,250 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 109 transitions. [2019-09-03 19:35:30,251 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2019-09-03 19:35:30,252 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 19:35:30,252 INFO L399 BasicCegarLoop]: trace histogram [70, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 19:35:30,252 INFO L418 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 19:35:30,252 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 19:35:30,252 INFO L82 PathProgramCache]: Analyzing trace with hash -284489192, now seen corresponding path program 11 times [2019-09-03 19:35:30,252 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-03 19:35:30,253 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-03 19:35:30,253 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:35:30,253 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-03 19:35:30,254 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:35:30,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 19:35:30,485 INFO L134 CoverageAnalysis]: Checked inductivity of 2975 backedges. 0 proven. 2590 refuted. 0 times theorem prover too weak. 385 trivial. 0 not checked. [2019-09-03 19:35:30,485 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 19:35:30,486 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) [2019-09-03 19:35:30,513 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-03 19:36:51,750 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 33 check-sat command(s) [2019-09-03 19:36:51,750 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-03 19:36:51,971 INFO L256 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 34 conjunts are in the unsatisfiable core [2019-09-03 19:36:51,973 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 19:36:52,172 INFO L134 CoverageAnalysis]: Checked inductivity of 2975 backedges. 0 proven. 2642 refuted. 0 times theorem prover too weak. 333 trivial. 0 not checked. [2019-09-03 19:36:52,187 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-03 19:36:52,188 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 18] total 19 [2019-09-03 19:36:52,188 INFO L454 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-09-03 19:36:52,189 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-09-03 19:36:52,190 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=283, Unknown=0, NotChecked=0, Total=342 [2019-09-03 19:36:52,190 INFO L87 Difference]: Start difference. First operand 102 states and 109 transitions. Second operand 19 states. [2019-09-03 19:36:52,541 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 19:36:52,541 INFO L93 Difference]: Finished difference Result 132 states and 141 transitions. [2019-09-03 19:36:52,541 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-09-03 19:36:52,542 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 101 [2019-09-03 19:36:52,542 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 19:36:52,543 INFO L225 Difference]: With dead ends: 132 [2019-09-03 19:36:52,543 INFO L226 Difference]: Without dead ends: 127 [2019-09-03 19:36:52,544 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 92 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=59, Invalid=283, Unknown=0, NotChecked=0, Total=342 [2019-09-03 19:36:52,544 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2019-09-03 19:36:52,554 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 115. [2019-09-03 19:36:52,554 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2019-09-03 19:36:52,555 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 123 transitions. [2019-09-03 19:36:52,555 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 123 transitions. Word has length 101 [2019-09-03 19:36:52,556 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 19:36:52,556 INFO L475 AbstractCegarLoop]: Abstraction has 115 states and 123 transitions. [2019-09-03 19:36:52,556 INFO L476 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-09-03 19:36:52,556 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 123 transitions. [2019-09-03 19:36:52,557 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2019-09-03 19:36:52,557 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 19:36:52,557 INFO L399 BasicCegarLoop]: trace histogram [80, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 19:36:52,557 INFO L418 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 19:36:52,557 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 19:36:52,558 INFO L82 PathProgramCache]: Analyzing trace with hash -352579535, now seen corresponding path program 12 times [2019-09-03 19:36:52,558 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-03 19:36:52,558 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-03 19:36:52,558 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:36:52,559 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-03 19:36:52,559 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:36:52,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 19:36:52,773 INFO L134 CoverageAnalysis]: Checked inductivity of 3892 backedges. 0 proven. 3452 refuted. 0 times theorem prover too weak. 440 trivial. 0 not checked. [2019-09-03 19:36:52,773 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 19:36:52,773 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 [2019-09-03 19:36:52,805 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2019-09-03 19:36:56,293 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 29 check-sat command(s) [2019-09-03 19:36:56,294 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-03 19:36:56,307 INFO L256 TraceCheckSpWp]: Trace formula consists of 228 conjuncts, 38 conjunts are in the unsatisfiable core [2019-09-03 19:36:56,309 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 19:36:56,540 INFO L134 CoverageAnalysis]: Checked inductivity of 3892 backedges. 0 proven. 3506 refuted. 0 times theorem prover too weak. 386 trivial. 0 not checked. [MP z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (13)] Exception during sending of exit command (exit): Broken pipe [2019-09-03 19:36:56,555 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-03 19:36:56,555 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 20] total 21 [2019-09-03 19:36:56,556 INFO L454 AbstractCegarLoop]: Interpolant automaton has 21 states [2019-09-03 19:36:56,556 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2019-09-03 19:36:56,556 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=354, Unknown=0, NotChecked=0, Total=420 [2019-09-03 19:36:56,557 INFO L87 Difference]: Start difference. First operand 115 states and 123 transitions. Second operand 21 states. [2019-09-03 19:36:56,908 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 19:36:56,908 INFO L93 Difference]: Finished difference Result 145 states and 155 transitions. [2019-09-03 19:36:56,910 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2019-09-03 19:36:56,910 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 114 [2019-09-03 19:36:56,910 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 19:36:56,911 INFO L225 Difference]: With dead ends: 145 [2019-09-03 19:36:56,911 INFO L226 Difference]: Without dead ends: 140 [2019-09-03 19:36:56,913 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 104 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=66, Invalid=354, Unknown=0, NotChecked=0, Total=420 [2019-09-03 19:36:56,913 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2019-09-03 19:36:56,941 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 128. [2019-09-03 19:36:56,941 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 128 states. [2019-09-03 19:36:56,941 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 137 transitions. [2019-09-03 19:36:56,942 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 137 transitions. Word has length 114 [2019-09-03 19:36:56,942 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 19:36:56,942 INFO L475 AbstractCegarLoop]: Abstraction has 128 states and 137 transitions. [2019-09-03 19:36:56,942 INFO L476 AbstractCegarLoop]: Interpolant automaton has 21 states. [2019-09-03 19:36:56,942 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 137 transitions. [2019-09-03 19:36:56,943 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2019-09-03 19:36:56,943 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 19:36:56,944 INFO L399 BasicCegarLoop]: trace histogram [90, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 19:36:56,944 INFO L418 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 19:36:56,944 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 19:36:56,944 INFO L82 PathProgramCache]: Analyzing trace with hash -535987528, now seen corresponding path program 13 times [2019-09-03 19:36:56,944 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-03 19:36:56,944 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-03 19:36:56,945 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:36:56,945 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-03 19:36:56,945 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:36:56,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 19:36:57,168 INFO L134 CoverageAnalysis]: Checked inductivity of 4932 backedges. 0 proven. 4437 refuted. 0 times theorem prover too weak. 495 trivial. 0 not checked. [2019-09-03 19:36:57,169 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 19:36:57,169 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) [2019-09-03 19:36:57,189 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-03 19:36:57,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 19:36:57,251 INFO L256 TraceCheckSpWp]: Trace formula consists of 348 conjuncts, 42 conjunts are in the unsatisfiable core [2019-09-03 19:36:57,253 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 19:36:57,541 INFO L134 CoverageAnalysis]: Checked inductivity of 4932 backedges. 0 proven. 4492 refuted. 0 times theorem prover too weak. 440 trivial. 0 not checked. [2019-09-03 19:36:57,544 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-03 19:36:57,545 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 22] total 23 [2019-09-03 19:36:57,545 INFO L454 AbstractCegarLoop]: Interpolant automaton has 23 states [2019-09-03 19:36:57,545 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2019-09-03 19:36:57,546 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=433, Unknown=0, NotChecked=0, Total=506 [2019-09-03 19:36:57,546 INFO L87 Difference]: Start difference. First operand 128 states and 137 transitions. Second operand 23 states. [2019-09-03 19:36:58,067 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 19:36:58,067 INFO L93 Difference]: Finished difference Result 158 states and 169 transitions. [2019-09-03 19:36:58,068 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2019-09-03 19:36:58,068 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 127 [2019-09-03 19:36:58,069 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 19:36:58,069 INFO L225 Difference]: With dead ends: 158 [2019-09-03 19:36:58,070 INFO L226 Difference]: Without dead ends: 153 [2019-09-03 19:36:58,072 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 116 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=73, Invalid=433, Unknown=0, NotChecked=0, Total=506 [2019-09-03 19:36:58,073 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 153 states. [2019-09-03 19:36:58,088 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 153 to 141. [2019-09-03 19:36:58,088 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 141 states. [2019-09-03 19:36:58,089 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 151 transitions. [2019-09-03 19:36:58,089 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 151 transitions. Word has length 127 [2019-09-03 19:36:58,091 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 19:36:58,091 INFO L475 AbstractCegarLoop]: Abstraction has 141 states and 151 transitions. [2019-09-03 19:36:58,091 INFO L476 AbstractCegarLoop]: Interpolant automaton has 23 states. [2019-09-03 19:36:58,091 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 151 transitions. [2019-09-03 19:36:58,092 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2019-09-03 19:36:58,092 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 19:36:58,092 INFO L399 BasicCegarLoop]: trace histogram [100, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 19:36:58,093 INFO L418 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 19:36:58,093 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 19:36:58,093 INFO L82 PathProgramCache]: Analyzing trace with hash 1611506577, now seen corresponding path program 14 times [2019-09-03 19:36:58,093 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-03 19:36:58,093 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-03 19:36:58,094 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:36:58,094 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 19:36:58,094 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:36:58,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 19:36:58,363 INFO L134 CoverageAnalysis]: Checked inductivity of 6095 backedges. 0 proven. 5545 refuted. 0 times theorem prover too weak. 550 trivial. 0 not checked. [2019-09-03 19:36:58,363 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 19:36:58,363 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-03 19:36:58,390 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2019-09-03 19:36:58,500 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-09-03 19:36:58,500 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-03 19:36:58,502 INFO L256 TraceCheckSpWp]: Trace formula consists of 384 conjuncts, 23 conjunts are in the unsatisfiable core [2019-09-03 19:36:58,506 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 19:36:58,615 INFO L134 CoverageAnalysis]: Checked inductivity of 6095 backedges. 0 proven. 5545 refuted. 0 times theorem prover too weak. 550 trivial. 0 not checked. [2019-09-03 19:36:58,627 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-03 19:36:58,628 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 14 [2019-09-03 19:36:58,628 INFO L454 AbstractCegarLoop]: Interpolant automaton has 14 states [2019-09-03 19:36:58,629 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2019-09-03 19:36:58,635 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2019-09-03 19:36:58,635 INFO L87 Difference]: Start difference. First operand 141 states and 151 transitions. Second operand 14 states. [2019-09-03 19:36:58,823 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 19:36:58,823 INFO L93 Difference]: Finished difference Result 171 states and 183 transitions. [2019-09-03 19:36:58,823 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2019-09-03 19:36:58,823 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 140 [2019-09-03 19:36:58,824 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 19:36:58,825 INFO L225 Difference]: With dead ends: 171 [2019-09-03 19:36:58,825 INFO L226 Difference]: Without dead ends: 166 [2019-09-03 19:36:58,826 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 153 GetRequests, 139 SyntacticMatches, 2 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2019-09-03 19:36:58,826 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2019-09-03 19:36:58,838 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 154. [2019-09-03 19:36:58,838 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 154 states. [2019-09-03 19:36:58,839 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 165 transitions. [2019-09-03 19:36:58,839 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 165 transitions. Word has length 140 [2019-09-03 19:36:58,839 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 19:36:58,839 INFO L475 AbstractCegarLoop]: Abstraction has 154 states and 165 transitions. [2019-09-03 19:36:58,840 INFO L476 AbstractCegarLoop]: Interpolant automaton has 14 states. [2019-09-03 19:36:58,840 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 165 transitions. [2019-09-03 19:36:58,841 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 154 [2019-09-03 19:36:58,841 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 19:36:58,841 INFO L399 BasicCegarLoop]: trace histogram [110, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 19:36:58,842 INFO L418 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 19:36:58,842 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 19:36:58,842 INFO L82 PathProgramCache]: Analyzing trace with hash -57777320, now seen corresponding path program 15 times [2019-09-03 19:36:58,842 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-03 19:36:58,842 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-03 19:36:58,843 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:36:58,843 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-03 19:36:58,843 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:36:58,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 19:36:59,159 INFO L134 CoverageAnalysis]: Checked inductivity of 7381 backedges. 0 proven. 6776 refuted. 0 times theorem prover too weak. 605 trivial. 0 not checked. [2019-09-03 19:36:59,160 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 19:36:59,160 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) [2019-09-03 19:36:59,180 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-03 19:43:46,070 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 52 check-sat command(s) [2019-09-03 19:43:46,071 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-03 19:43:47,338 INFO L256 TraceCheckSpWp]: Trace formula consists of 420 conjuncts, 25 conjunts are in the unsatisfiable core [2019-09-03 19:43:47,340 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 19:43:47,401 INFO L134 CoverageAnalysis]: Checked inductivity of 7381 backedges. 0 proven. 6776 refuted. 0 times theorem prover too weak. 605 trivial. 0 not checked. [2019-09-03 19:43:47,411 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-03 19:43:47,411 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 15 [2019-09-03 19:43:47,412 INFO L454 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-09-03 19:43:47,412 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-09-03 19:43:47,412 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2019-09-03 19:43:47,412 INFO L87 Difference]: Start difference. First operand 154 states and 165 transitions. Second operand 15 states. [2019-09-03 19:43:47,627 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 19:43:47,628 INFO L93 Difference]: Finished difference Result 184 states and 197 transitions. [2019-09-03 19:43:47,628 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-09-03 19:43:47,628 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 153 [2019-09-03 19:43:47,629 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 19:43:47,630 INFO L225 Difference]: With dead ends: 184 [2019-09-03 19:43:47,630 INFO L226 Difference]: Without dead ends: 179 [2019-09-03 19:43:47,630 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 152 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2019-09-03 19:43:47,631 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179 states. [2019-09-03 19:43:47,643 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 179 to 167. [2019-09-03 19:43:47,643 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 167 states. [2019-09-03 19:43:47,644 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 179 transitions. [2019-09-03 19:43:47,644 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 179 transitions. Word has length 153 [2019-09-03 19:43:47,645 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 19:43:47,645 INFO L475 AbstractCegarLoop]: Abstraction has 167 states and 179 transitions. [2019-09-03 19:43:47,645 INFO L476 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-09-03 19:43:47,645 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 179 transitions. [2019-09-03 19:43:47,646 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 167 [2019-09-03 19:43:47,646 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 19:43:47,647 INFO L399 BasicCegarLoop]: trace histogram [120, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 19:43:47,647 INFO L418 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 19:43:47,647 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 19:43:47,647 INFO L82 PathProgramCache]: Analyzing trace with hash -1125925135, now seen corresponding path program 16 times [2019-09-03 19:43:47,647 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-03 19:43:47,648 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-03 19:43:47,648 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:43:47,648 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-03 19:43:47,649 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:43:47,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 19:43:48,024 INFO L134 CoverageAnalysis]: Checked inductivity of 8790 backedges. 0 proven. 8130 refuted. 0 times theorem prover too weak. 660 trivial. 0 not checked. [2019-09-03 19:43:48,025 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 19:43:48,025 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) [2019-09-03 19:43:48,052 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-03 19:43:48,135 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-09-03 19:43:48,135 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-03 19:43:48,137 INFO L256 TraceCheckSpWp]: Trace formula consists of 456 conjuncts, 27 conjunts are in the unsatisfiable core [2019-09-03 19:43:48,139 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 19:43:48,214 INFO L134 CoverageAnalysis]: Checked inductivity of 8790 backedges. 0 proven. 8130 refuted. 0 times theorem prover too weak. 660 trivial. 0 not checked. [2019-09-03 19:43:48,218 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-03 19:43:48,218 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 16 [2019-09-03 19:43:48,218 INFO L454 AbstractCegarLoop]: Interpolant automaton has 16 states [2019-09-03 19:43:48,219 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2019-09-03 19:43:48,219 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2019-09-03 19:43:48,219 INFO L87 Difference]: Start difference. First operand 167 states and 179 transitions. Second operand 16 states. [2019-09-03 19:43:48,481 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 19:43:48,481 INFO L93 Difference]: Finished difference Result 197 states and 211 transitions. [2019-09-03 19:43:48,482 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2019-09-03 19:43:48,482 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 166 [2019-09-03 19:43:48,482 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 19:43:48,483 INFO L225 Difference]: With dead ends: 197 [2019-09-03 19:43:48,483 INFO L226 Difference]: Without dead ends: 192 [2019-09-03 19:43:48,484 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 181 GetRequests, 165 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2019-09-03 19:43:48,484 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 192 states. [2019-09-03 19:43:48,499 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 192 to 180. [2019-09-03 19:43:48,499 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 180 states. [2019-09-03 19:43:48,500 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 180 states to 180 states and 193 transitions. [2019-09-03 19:43:48,500 INFO L78 Accepts]: Start accepts. Automaton has 180 states and 193 transitions. Word has length 166 [2019-09-03 19:43:48,500 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 19:43:48,501 INFO L475 AbstractCegarLoop]: Abstraction has 180 states and 193 transitions. [2019-09-03 19:43:48,501 INFO L476 AbstractCegarLoop]: Interpolant automaton has 16 states. [2019-09-03 19:43:48,501 INFO L276 IsEmpty]: Start isEmpty. Operand 180 states and 193 transitions. [2019-09-03 19:43:48,502 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 180 [2019-09-03 19:43:48,502 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 19:43:48,503 INFO L399 BasicCegarLoop]: trace histogram [130, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 19:43:48,503 INFO L418 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 19:43:48,503 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 19:43:48,503 INFO L82 PathProgramCache]: Analyzing trace with hash -1024998408, now seen corresponding path program 17 times [2019-09-03 19:43:48,503 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-03 19:43:48,504 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-03 19:43:48,504 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:43:48,504 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-03 19:43:48,504 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:43:48,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 19:43:48,862 INFO L134 CoverageAnalysis]: Checked inductivity of 10322 backedges. 0 proven. 9607 refuted. 0 times theorem prover too weak. 715 trivial. 0 not checked. [2019-09-03 19:43:48,863 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 19:43:48,863 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 [2019-09-03 19:43:48,872 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1