java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/functions_1-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-0883e75 [2019-09-05 11:43:46,666 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-09-05 11:43:46,668 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-09-05 11:43:46,680 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-09-05 11:43:46,681 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-09-05 11:43:46,682 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-09-05 11:43:46,683 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-09-05 11:43:46,685 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-09-05 11:43:46,686 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-09-05 11:43:46,687 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-09-05 11:43:46,688 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-09-05 11:43:46,690 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-09-05 11:43:46,690 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-09-05 11:43:46,691 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-09-05 11:43:46,692 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-09-05 11:43:46,693 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-09-05 11:43:46,694 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-09-05 11:43:46,695 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-09-05 11:43:46,696 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-09-05 11:43:46,698 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-09-05 11:43:46,700 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-09-05 11:43:46,701 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-09-05 11:43:46,702 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-09-05 11:43:46,703 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-09-05 11:43:46,705 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-09-05 11:43:46,706 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-09-05 11:43:46,706 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-09-05 11:43:46,707 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-09-05 11:43:46,707 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-09-05 11:43:46,708 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-09-05 11:43:46,708 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-09-05 11:43:46,709 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-09-05 11:43:46,710 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-09-05 11:43:46,711 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-09-05 11:43:46,712 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-09-05 11:43:46,712 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-09-05 11:43:46,713 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-09-05 11:43:46,713 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-09-05 11:43:46,713 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-09-05 11:43:46,714 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-09-05 11:43:46,715 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-09-05 11:43:46,716 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2019-09-05 11:43:46,730 INFO L113 SettingsManager]: Loading preferences was successful [2019-09-05 11:43:46,731 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-09-05 11:43:46,732 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-09-05 11:43:46,732 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-09-05 11:43:46,733 INFO L138 SettingsManager]: * Use SBE=true [2019-09-05 11:43:46,733 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-09-05 11:43:46,733 INFO L138 SettingsManager]: * sizeof long=4 [2019-09-05 11:43:46,733 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-09-05 11:43:46,733 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-09-05 11:43:46,734 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-09-05 11:43:46,734 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-09-05 11:43:46,734 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-09-05 11:43:46,734 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-09-05 11:43:46,734 INFO L138 SettingsManager]: * sizeof long double=12 [2019-09-05 11:43:46,735 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-09-05 11:43:46,735 INFO L138 SettingsManager]: * Use constant arrays=true [2019-09-05 11:43:46,735 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-09-05 11:43:46,735 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-09-05 11:43:46,735 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-09-05 11:43:46,736 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-09-05 11:43:46,736 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-09-05 11:43:46,736 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-09-05 11:43:46,736 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-09-05 11:43:46,737 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-09-05 11:43:46,737 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-09-05 11:43:46,737 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-09-05 11:43:46,737 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-09-05 11:43:46,737 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-09-05 11:43:46,738 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-09-05 11:43:46,766 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-09-05 11:43:46,784 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-09-05 11:43:46,788 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-09-05 11:43:46,789 INFO L271 PluginConnector]: Initializing CDTParser... [2019-09-05 11:43:46,790 INFO L275 PluginConnector]: CDTParser initialized [2019-09-05 11:43:46,791 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/functions_1-2.c [2019-09-05 11:43:46,854 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f1b6d007e/422cc98066214fbb84fefbe8f5eaa260/FLAGdaac4bf87 [2019-09-05 11:43:47,287 INFO L306 CDTParser]: Found 1 translation units. [2019-09-05 11:43:47,289 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/functions_1-2.c [2019-09-05 11:43:47,295 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f1b6d007e/422cc98066214fbb84fefbe8f5eaa260/FLAGdaac4bf87 [2019-09-05 11:43:47,644 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f1b6d007e/422cc98066214fbb84fefbe8f5eaa260 [2019-09-05 11:43:47,655 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-09-05 11:43:47,657 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-09-05 11:43:47,658 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-09-05 11:43:47,658 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-09-05 11:43:47,662 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-09-05 11:43:47,663 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 05.09 11:43:47" (1/1) ... [2019-09-05 11:43:47,666 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@720701ce and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 11:43:47, skipping insertion in model container [2019-09-05 11:43:47,666 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 05.09 11:43:47" (1/1) ... [2019-09-05 11:43:47,674 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-09-05 11:43:47,690 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-09-05 11:43:47,907 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-09-05 11:43:47,922 INFO L188 MainTranslator]: Completed pre-run [2019-09-05 11:43:47,944 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-09-05 11:43:47,957 INFO L192 MainTranslator]: Completed translation [2019-09-05 11:43:47,957 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 11:43:47 WrapperNode [2019-09-05 11:43:47,957 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-09-05 11:43:47,958 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-09-05 11:43:47,958 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-09-05 11:43:47,958 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-09-05 11:43:48,063 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 11:43:47" (1/1) ... [2019-09-05 11:43:48,063 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 11:43:47" (1/1) ... [2019-09-05 11:43:48,069 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 11:43:47" (1/1) ... [2019-09-05 11:43:48,069 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 11:43:47" (1/1) ... [2019-09-05 11:43:48,074 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 11:43:47" (1/1) ... [2019-09-05 11:43:48,082 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 11:43:47" (1/1) ... [2019-09-05 11:43:48,083 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 11:43:47" (1/1) ... [2019-09-05 11:43:48,085 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-09-05 11:43:48,085 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-09-05 11:43:48,085 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-09-05 11:43:48,085 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-09-05 11:43:48,088 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 11:43:47" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-09-05 11:43:48,142 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-09-05 11:43:48,142 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-09-05 11:43:48,142 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-09-05 11:43:48,142 INFO L138 BoogieDeclarations]: Found implementation of procedure f [2019-09-05 11:43:48,142 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-09-05 11:43:48,142 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-09-05 11:43:48,143 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-09-05 11:43:48,143 INFO L130 BoogieDeclarations]: Found specification of procedure f [2019-09-05 11:43:48,143 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-09-05 11:43:48,143 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-09-05 11:43:48,143 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-09-05 11:43:48,313 INFO L278 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-09-05 11:43:48,313 INFO L283 CfgBuilder]: Removed 1 assume(true) statements. [2019-09-05 11:43:48,314 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 05.09 11:43:48 BoogieIcfgContainer [2019-09-05 11:43:48,314 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-09-05 11:43:48,315 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-09-05 11:43:48,315 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-09-05 11:43:48,318 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-09-05 11:43:48,319 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 05.09 11:43:47" (1/3) ... [2019-09-05 11:43:48,319 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@71a72562 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 05.09 11:43:48, skipping insertion in model container [2019-09-05 11:43:48,320 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 11:43:47" (2/3) ... [2019-09-05 11:43:48,320 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@71a72562 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 05.09 11:43:48, skipping insertion in model container [2019-09-05 11:43:48,320 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 05.09 11:43:48" (3/3) ... [2019-09-05 11:43:48,322 INFO L109 eAbstractionObserver]: Analyzing ICFG functions_1-2.c [2019-09-05 11:43:48,331 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-09-05 11:43:48,338 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-09-05 11:43:48,355 INFO L252 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-09-05 11:43:48,384 INFO L128 ementStrategyFactory]: Using default assertion order modulation [2019-09-05 11:43:48,384 INFO L377 AbstractCegarLoop]: Interprodecural is true [2019-09-05 11:43:48,385 INFO L378 AbstractCegarLoop]: Hoare is true [2019-09-05 11:43:48,385 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-09-05 11:43:48,385 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-09-05 11:43:48,385 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-09-05 11:43:48,385 INFO L382 AbstractCegarLoop]: Difference is false [2019-09-05 11:43:48,385 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-09-05 11:43:48,386 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-09-05 11:43:48,402 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states. [2019-09-05 11:43:48,407 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2019-09-05 11:43:48,407 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 11:43:48,408 INFO L399 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 11:43:48,410 INFO L418 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 11:43:48,415 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 11:43:48,415 INFO L82 PathProgramCache]: Analyzing trace with hash -1238725826, now seen corresponding path program 1 times [2019-09-05 11:43:48,416 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 11:43:48,417 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 11:43:48,456 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:43:48,456 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 11:43:48,457 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:43:48,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 11:43:48,509 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 11:43:48,512 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-09-05 11:43:48,512 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2019-09-05 11:43:48,516 INFO L454 AbstractCegarLoop]: Interpolant automaton has 2 states [2019-09-05 11:43:48,527 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2019-09-05 11:43:48,528 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-09-05 11:43:48,530 INFO L87 Difference]: Start difference. First operand 22 states. Second operand 2 states. [2019-09-05 11:43:48,549 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 11:43:48,549 INFO L93 Difference]: Finished difference Result 33 states and 36 transitions. [2019-09-05 11:43:48,550 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2019-09-05 11:43:48,551 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2019-09-05 11:43:48,551 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 11:43:48,557 INFO L225 Difference]: With dead ends: 33 [2019-09-05 11:43:48,558 INFO L226 Difference]: Without dead ends: 16 [2019-09-05 11:43:48,561 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-09-05 11:43:48,580 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2019-09-05 11:43:48,599 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2019-09-05 11:43:48,600 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2019-09-05 11:43:48,601 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2019-09-05 11:43:48,603 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 10 [2019-09-05 11:43:48,604 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 11:43:48,604 INFO L475 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2019-09-05 11:43:48,604 INFO L476 AbstractCegarLoop]: Interpolant automaton has 2 states. [2019-09-05 11:43:48,604 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2019-09-05 11:43:48,605 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2019-09-05 11:43:48,605 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 11:43:48,605 INFO L399 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 11:43:48,605 INFO L418 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 11:43:48,606 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 11:43:48,606 INFO L82 PathProgramCache]: Analyzing trace with hash -1244266952, now seen corresponding path program 1 times [2019-09-05 11:43:48,606 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 11:43:48,606 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 11:43:48,607 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:43:48,608 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 11:43:48,608 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:43:48,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 11:43:48,890 WARN L188 SmtUtils]: Spent 176.00 ms on a formula simplification. DAG size of input: 13 DAG size of output: 5 [2019-09-05 11:43:48,895 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 11:43:48,895 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-09-05 11:43:48,895 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-09-05 11:43:48,897 INFO L454 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-09-05 11:43:48,897 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-09-05 11:43:48,898 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-09-05 11:43:48,898 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 3 states. [2019-09-05 11:43:48,935 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 11:43:48,936 INFO L93 Difference]: Finished difference Result 24 states and 25 transitions. [2019-09-05 11:43:48,937 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-09-05 11:43:48,937 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2019-09-05 11:43:48,937 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 11:43:48,940 INFO L225 Difference]: With dead ends: 24 [2019-09-05 11:43:48,940 INFO L226 Difference]: Without dead ends: 19 [2019-09-05 11:43:48,941 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-09-05 11:43:48,941 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2019-09-05 11:43:48,959 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 17. [2019-09-05 11:43:48,959 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2019-09-05 11:43:48,961 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2019-09-05 11:43:48,962 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 10 [2019-09-05 11:43:48,962 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 11:43:48,962 INFO L475 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2019-09-05 11:43:48,962 INFO L476 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-09-05 11:43:48,963 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2019-09-05 11:43:48,964 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-09-05 11:43:48,964 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 11:43:48,964 INFO L399 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 11:43:48,964 INFO L418 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 11:43:48,965 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 11:43:48,965 INFO L82 PathProgramCache]: Analyzing trace with hash 1831198934, now seen corresponding path program 1 times [2019-09-05 11:43:48,965 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 11:43:48,965 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 11:43:48,967 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:43:48,968 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 11:43:48,969 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:43:49,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 11:43:49,148 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 11:43:49,148 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 11:43:49,148 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 11:43:49,165 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 11:43:49,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 11:43:49,183 INFO L256 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 13 conjunts are in the unsatisfiable core [2019-09-05 11:43:49,188 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 11:43:49,270 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 11:43:49,275 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-05 11:43:49,275 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 7 [2019-09-05 11:43:49,276 INFO L454 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-09-05 11:43:49,276 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-09-05 11:43:49,276 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2019-09-05 11:43:49,277 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 7 states. [2019-09-05 11:43:49,377 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 11:43:49,377 INFO L93 Difference]: Finished difference Result 27 states and 29 transitions. [2019-09-05 11:43:49,379 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-09-05 11:43:49,379 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 16 [2019-09-05 11:43:49,379 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 11:43:49,380 INFO L225 Difference]: With dead ends: 27 [2019-09-05 11:43:49,380 INFO L226 Difference]: Without dead ends: 22 [2019-09-05 11:43:49,381 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 14 SyntacticMatches, 3 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2019-09-05 11:43:49,381 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2019-09-05 11:43:49,388 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 20. [2019-09-05 11:43:49,388 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2019-09-05 11:43:49,390 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2019-09-05 11:43:49,391 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 16 [2019-09-05 11:43:49,391 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 11:43:49,391 INFO L475 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2019-09-05 11:43:49,392 INFO L476 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-09-05 11:43:49,392 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2019-09-05 11:43:49,396 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2019-09-05 11:43:49,397 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 11:43:49,397 INFO L399 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 11:43:49,397 INFO L418 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 11:43:49,398 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 11:43:49,398 INFO L82 PathProgramCache]: Analyzing trace with hash 329045236, now seen corresponding path program 2 times [2019-09-05 11:43:49,398 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 11:43:49,398 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 11:43:49,399 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:43:49,399 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 11:43:49,399 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:43:49,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 11:43:49,589 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-09-05 11:43:49,590 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 11:43:49,590 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 11:43:49,607 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2019-09-05 11:43:49,629 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-09-05 11:43:49,630 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 11:43:49,631 INFO L256 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 23 conjunts are in the unsatisfiable core [2019-09-05 11:43:49,634 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 11:43:49,705 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-09-05 11:43:49,710 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-05 11:43:49,711 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 9 [2019-09-05 11:43:49,711 INFO L454 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-09-05 11:43:49,712 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-09-05 11:43:49,712 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2019-09-05 11:43:49,712 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand 9 states. [2019-09-05 11:43:49,881 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 11:43:49,881 INFO L93 Difference]: Finished difference Result 30 states and 33 transitions. [2019-09-05 11:43:49,881 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-09-05 11:43:49,882 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 22 [2019-09-05 11:43:49,882 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 11:43:49,883 INFO L225 Difference]: With dead ends: 30 [2019-09-05 11:43:49,883 INFO L226 Difference]: Without dead ends: 25 [2019-09-05 11:43:49,883 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 20 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2019-09-05 11:43:49,884 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2019-09-05 11:43:49,893 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 23. [2019-09-05 11:43:49,894 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2019-09-05 11:43:49,896 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions. [2019-09-05 11:43:49,896 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 22 [2019-09-05 11:43:49,898 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 11:43:49,898 INFO L475 AbstractCegarLoop]: Abstraction has 23 states and 25 transitions. [2019-09-05 11:43:49,898 INFO L476 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-09-05 11:43:49,898 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions. [2019-09-05 11:43:49,899 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2019-09-05 11:43:49,899 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 11:43:49,900 INFO L399 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 11:43:49,901 INFO L418 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 11:43:49,901 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 11:43:49,901 INFO L82 PathProgramCache]: Analyzing trace with hash 755481234, now seen corresponding path program 3 times [2019-09-05 11:43:49,902 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 11:43:49,902 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 11:43:49,903 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:43:49,903 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 11:43:49,903 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:43:49,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 11:43:50,113 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-09-05 11:43:50,113 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 11:43:50,114 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) [2019-09-05 11:43:50,136 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 [2019-09-05 11:43:50,181 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2019-09-05 11:43:50,182 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 11:43:50,183 WARN L254 TraceCheckSpWp]: Trace formula consists of 64 conjuncts, 33 conjunts are in the unsatisfiable core [2019-09-05 11:43:50,185 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 11:43:50,243 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-09-05 11:43:50,246 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-05 11:43:50,247 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 11 [2019-09-05 11:43:50,247 INFO L454 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-09-05 11:43:50,247 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-09-05 11:43:50,248 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2019-09-05 11:43:50,248 INFO L87 Difference]: Start difference. First operand 23 states and 25 transitions. Second operand 11 states. [2019-09-05 11:43:50,410 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 11:43:50,410 INFO L93 Difference]: Finished difference Result 33 states and 37 transitions. [2019-09-05 11:43:50,410 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-09-05 11:43:50,411 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 28 [2019-09-05 11:43:50,411 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 11:43:50,412 INFO L225 Difference]: With dead ends: 33 [2019-09-05 11:43:50,412 INFO L226 Difference]: Without dead ends: 28 [2019-09-05 11:43:50,413 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 26 SyntacticMatches, 5 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2019-09-05 11:43:50,413 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2019-09-05 11:43:50,418 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2019-09-05 11:43:50,418 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2019-09-05 11:43:50,419 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 29 transitions. [2019-09-05 11:43:50,419 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 29 transitions. Word has length 28 [2019-09-05 11:43:50,420 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 11:43:50,420 INFO L475 AbstractCegarLoop]: Abstraction has 26 states and 29 transitions. [2019-09-05 11:43:50,420 INFO L476 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-09-05 11:43:50,420 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 29 transitions. [2019-09-05 11:43:50,421 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2019-09-05 11:43:50,421 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 11:43:50,421 INFO L399 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 11:43:50,422 INFO L418 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 11:43:50,422 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 11:43:50,422 INFO L82 PathProgramCache]: Analyzing trace with hash -1475645008, now seen corresponding path program 4 times [2019-09-05 11:43:50,422 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 11:43:50,422 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 11:43:50,423 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:43:50,423 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 11:43:50,424 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:43:50,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 11:43:50,683 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2019-09-05 11:43:50,684 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 11:43:50,684 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) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 11:43:50,709 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-09-05 11:43:50,729 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-09-05 11:43:50,729 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 11:43:50,731 WARN L254 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 43 conjunts are in the unsatisfiable core [2019-09-05 11:43:50,734 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 11:43:50,812 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2019-09-05 11:43:50,816 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-05 11:43:50,816 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 13 [2019-09-05 11:43:50,816 INFO L454 AbstractCegarLoop]: Interpolant automaton has 13 states [2019-09-05 11:43:50,817 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2019-09-05 11:43:50,819 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=128, Unknown=0, NotChecked=0, Total=156 [2019-09-05 11:43:50,819 INFO L87 Difference]: Start difference. First operand 26 states and 29 transitions. Second operand 13 states. [2019-09-05 11:43:51,090 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 11:43:51,090 INFO L93 Difference]: Finished difference Result 36 states and 41 transitions. [2019-09-05 11:43:51,091 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-09-05 11:43:51,091 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 34 [2019-09-05 11:43:51,092 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 11:43:51,092 INFO L225 Difference]: With dead ends: 36 [2019-09-05 11:43:51,093 INFO L226 Difference]: Without dead ends: 31 [2019-09-05 11:43:51,098 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 32 SyntacticMatches, 6 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=48, Invalid=224, Unknown=0, NotChecked=0, Total=272 [2019-09-05 11:43:51,099 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2019-09-05 11:43:51,106 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 29. [2019-09-05 11:43:51,106 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2019-09-05 11:43:51,110 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2019-09-05 11:43:51,110 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 34 [2019-09-05 11:43:51,110 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 11:43:51,110 INFO L475 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2019-09-05 11:43:51,111 INFO L476 AbstractCegarLoop]: Interpolant automaton has 13 states. [2019-09-05 11:43:51,111 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2019-09-05 11:43:51,113 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2019-09-05 11:43:51,113 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 11:43:51,116 INFO L399 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 11:43:51,116 INFO L418 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 11:43:51,117 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 11:43:51,117 INFO L82 PathProgramCache]: Analyzing trace with hash 1545919054, now seen corresponding path program 5 times [2019-09-05 11:43:51,117 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 11:43:51,117 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 11:43:51,120 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:43:51,120 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 11:43:51,120 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:43:51,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 11:43:51,381 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 0 proven. 35 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2019-09-05 11:43:51,381 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 11:43:51,381 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) [2019-09-05 11:43:51,395 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 [2019-09-05 11:43:51,434 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2019-09-05 11:43:51,434 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 11:43:51,435 WARN L254 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 53 conjunts are in the unsatisfiable core [2019-09-05 11:43:51,439 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 11:43:51,513 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 0 proven. 35 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2019-09-05 11:43:51,517 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-05 11:43:51,517 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 15 [2019-09-05 11:43:51,518 INFO L454 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-09-05 11:43:51,518 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-09-05 11:43:51,518 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=177, Unknown=0, NotChecked=0, Total=210 [2019-09-05 11:43:51,518 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand 15 states. [2019-09-05 11:43:51,776 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 11:43:51,776 INFO L93 Difference]: Finished difference Result 39 states and 45 transitions. [2019-09-05 11:43:51,776 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-09-05 11:43:51,777 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 40 [2019-09-05 11:43:51,777 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 11:43:51,778 INFO L225 Difference]: With dead ends: 39 [2019-09-05 11:43:51,778 INFO L226 Difference]: Without dead ends: 34 [2019-09-05 11:43:51,779 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 38 SyntacticMatches, 7 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=58, Invalid=322, Unknown=0, NotChecked=0, Total=380 [2019-09-05 11:43:51,779 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2019-09-05 11:43:51,784 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 32. [2019-09-05 11:43:51,784 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2019-09-05 11:43:51,785 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 37 transitions. [2019-09-05 11:43:51,785 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 37 transitions. Word has length 40 [2019-09-05 11:43:51,785 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 11:43:51,786 INFO L475 AbstractCegarLoop]: Abstraction has 32 states and 37 transitions. [2019-09-05 11:43:51,786 INFO L476 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-09-05 11:43:51,786 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 37 transitions. [2019-09-05 11:43:51,787 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2019-09-05 11:43:51,787 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 11:43:51,787 INFO L399 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 11:43:51,788 INFO L418 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 11:43:51,788 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 11:43:51,790 INFO L82 PathProgramCache]: Analyzing trace with hash 128504940, now seen corresponding path program 6 times [2019-09-05 11:43:51,790 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 11:43:51,790 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 11:43:51,791 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:43:51,792 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 11:43:51,792 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:43:51,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 11:43:52,099 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 0 proven. 51 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2019-09-05 11:43:52,100 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 11:43:52,100 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 11:43:52,122 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2019-09-05 11:43:52,163 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2019-09-05 11:43:52,163 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 11:43:52,165 WARN L254 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 63 conjunts are in the unsatisfiable core [2019-09-05 11:43:52,168 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 11:43:52,258 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 0 proven. 51 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2019-09-05 11:43:52,262 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-05 11:43:52,263 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 17 [2019-09-05 11:43:52,263 INFO L454 AbstractCegarLoop]: Interpolant automaton has 17 states [2019-09-05 11:43:52,263 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2019-09-05 11:43:52,265 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=234, Unknown=0, NotChecked=0, Total=272 [2019-09-05 11:43:52,265 INFO L87 Difference]: Start difference. First operand 32 states and 37 transitions. Second operand 17 states. [2019-09-05 11:43:52,715 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 11:43:52,715 INFO L93 Difference]: Finished difference Result 42 states and 49 transitions. [2019-09-05 11:43:52,716 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2019-09-05 11:43:52,716 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 46 [2019-09-05 11:43:52,717 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 11:43:52,719 INFO L225 Difference]: With dead ends: 42 [2019-09-05 11:43:52,719 INFO L226 Difference]: Without dead ends: 37 [2019-09-05 11:43:52,719 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 44 SyntacticMatches, 8 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=68, Invalid=438, Unknown=0, NotChecked=0, Total=506 [2019-09-05 11:43:52,720 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2019-09-05 11:43:52,726 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2019-09-05 11:43:52,727 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2019-09-05 11:43:52,728 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 41 transitions. [2019-09-05 11:43:52,728 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 41 transitions. Word has length 46 [2019-09-05 11:43:52,729 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 11:43:52,729 INFO L475 AbstractCegarLoop]: Abstraction has 35 states and 41 transitions. [2019-09-05 11:43:52,729 INFO L476 AbstractCegarLoop]: Interpolant automaton has 17 states. [2019-09-05 11:43:52,729 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 41 transitions. [2019-09-05 11:43:52,730 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2019-09-05 11:43:52,731 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 11:43:52,731 INFO L399 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 11:43:52,732 INFO L418 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 11:43:52,732 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 11:43:52,732 INFO L82 PathProgramCache]: Analyzing trace with hash -842776566, now seen corresponding path program 7 times [2019-09-05 11:43:52,732 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 11:43:52,732 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 11:43:52,733 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:43:52,733 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 11:43:52,734 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:43:52,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 11:43:53,039 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 0 proven. 70 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2019-09-05 11:43:53,039 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 11:43:53,039 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 11:43:53,049 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 11:43:53,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 11:43:53,069 WARN L254 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 73 conjunts are in the unsatisfiable core [2019-09-05 11:43:53,072 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 11:43:53,152 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 0 proven. 70 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2019-09-05 11:43:53,156 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-05 11:43:53,156 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 19 [2019-09-05 11:43:53,157 INFO L454 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-09-05 11:43:53,157 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-09-05 11:43:53,158 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=299, Unknown=0, NotChecked=0, Total=342 [2019-09-05 11:43:53,158 INFO L87 Difference]: Start difference. First operand 35 states and 41 transitions. Second operand 19 states. [2019-09-05 11:43:53,596 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 11:43:53,597 INFO L93 Difference]: Finished difference Result 45 states and 53 transitions. [2019-09-05 11:43:53,599 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-09-05 11:43:53,600 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 52 [2019-09-05 11:43:53,600 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 11:43:53,601 INFO L225 Difference]: With dead ends: 45 [2019-09-05 11:43:53,601 INFO L226 Difference]: Without dead ends: 40 [2019-09-05 11:43:53,602 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 50 SyntacticMatches, 9 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=78, Invalid=572, Unknown=0, NotChecked=0, Total=650 [2019-09-05 11:43:53,602 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2019-09-05 11:43:53,607 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 38. [2019-09-05 11:43:53,607 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2019-09-05 11:43:53,608 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 45 transitions. [2019-09-05 11:43:53,608 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 45 transitions. Word has length 52 [2019-09-05 11:43:53,608 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 11:43:53,609 INFO L475 AbstractCegarLoop]: Abstraction has 38 states and 45 transitions. [2019-09-05 11:43:53,609 INFO L476 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-09-05 11:43:53,609 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 45 transitions. [2019-09-05 11:43:53,610 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2019-09-05 11:43:53,610 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 11:43:53,610 INFO L399 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 11:43:53,611 INFO L418 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 11:43:53,611 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 11:43:53,611 INFO L82 PathProgramCache]: Analyzing trace with hash 880540968, now seen corresponding path program 8 times [2019-09-05 11:43:53,611 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 11:43:53,611 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 11:43:53,612 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:43:53,612 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 11:43:53,612 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:43:53,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 11:43:53,970 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2019-09-05 11:43:53,974 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 11:43:53,974 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 11:43:54,003 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2019-09-05 11:43:54,029 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-09-05 11:43:54,030 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 11:43:54,032 WARN L254 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 83 conjunts are in the unsatisfiable core [2019-09-05 11:43:54,041 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 11:43:54,170 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2019-09-05 11:43:54,178 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-05 11:43:54,178 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 21 [2019-09-05 11:43:54,180 INFO L454 AbstractCegarLoop]: Interpolant automaton has 21 states [2019-09-05 11:43:54,180 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2019-09-05 11:43:54,180 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=372, Unknown=0, NotChecked=0, Total=420 [2019-09-05 11:43:54,181 INFO L87 Difference]: Start difference. First operand 38 states and 45 transitions. Second operand 21 states. [2019-09-05 11:43:54,743 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 11:43:54,744 INFO L93 Difference]: Finished difference Result 48 states and 57 transitions. [2019-09-05 11:43:54,744 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2019-09-05 11:43:54,744 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 58 [2019-09-05 11:43:54,745 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 11:43:54,745 INFO L225 Difference]: With dead ends: 48 [2019-09-05 11:43:54,746 INFO L226 Difference]: Without dead ends: 43 [2019-09-05 11:43:54,746 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 56 SyntacticMatches, 10 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=88, Invalid=724, Unknown=0, NotChecked=0, Total=812 [2019-09-05 11:43:54,747 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2019-09-05 11:43:54,752 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 41. [2019-09-05 11:43:54,752 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2019-09-05 11:43:54,753 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 49 transitions. [2019-09-05 11:43:54,753 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 49 transitions. Word has length 58 [2019-09-05 11:43:54,754 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 11:43:54,754 INFO L475 AbstractCegarLoop]: Abstraction has 41 states and 49 transitions. [2019-09-05 11:43:54,754 INFO L476 AbstractCegarLoop]: Interpolant automaton has 21 states. [2019-09-05 11:43:54,754 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 49 transitions. [2019-09-05 11:43:54,755 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2019-09-05 11:43:54,755 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 11:43:54,755 INFO L399 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 11:43:54,756 INFO L418 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 11:43:54,756 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 11:43:54,756 INFO L82 PathProgramCache]: Analyzing trace with hash -1565725754, now seen corresponding path program 9 times [2019-09-05 11:43:54,756 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 11:43:54,756 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 11:43:54,757 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:43:54,757 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 11:43:54,757 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:43:54,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 11:43:55,116 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 117 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2019-09-05 11:43:55,116 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 11:43:55,117 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) [2019-09-05 11:43:55,143 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 11:44:58,948 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2019-09-05 11:44:58,948 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 11:44:59,011 WARN L254 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 93 conjunts are in the unsatisfiable core [2019-09-05 11:44:59,015 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 11:44:59,123 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 117 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2019-09-05 11:44:59,129 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-05 11:44:59,129 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 23 [2019-09-05 11:44:59,130 INFO L454 AbstractCegarLoop]: Interpolant automaton has 23 states [2019-09-05 11:44:59,130 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2019-09-05 11:44:59,131 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=453, Unknown=0, NotChecked=0, Total=506 [2019-09-05 11:44:59,131 INFO L87 Difference]: Start difference. First operand 41 states and 49 transitions. Second operand 23 states. [2019-09-05 11:44:59,825 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 11:44:59,826 INFO L93 Difference]: Finished difference Result 51 states and 61 transitions. [2019-09-05 11:44:59,826 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2019-09-05 11:44:59,826 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 64 [2019-09-05 11:44:59,827 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 11:44:59,827 INFO L225 Difference]: With dead ends: 51 [2019-09-05 11:44:59,828 INFO L226 Difference]: Without dead ends: 46 [2019-09-05 11:44:59,829 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 62 SyntacticMatches, 11 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 47 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=98, Invalid=894, Unknown=0, NotChecked=0, Total=992 [2019-09-05 11:44:59,829 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2019-09-05 11:44:59,834 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 44. [2019-09-05 11:44:59,834 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2019-09-05 11:44:59,835 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 53 transitions. [2019-09-05 11:44:59,835 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 53 transitions. Word has length 64 [2019-09-05 11:44:59,836 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 11:44:59,836 INFO L475 AbstractCegarLoop]: Abstraction has 44 states and 53 transitions. [2019-09-05 11:44:59,836 INFO L476 AbstractCegarLoop]: Interpolant automaton has 23 states. [2019-09-05 11:44:59,836 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 53 transitions. [2019-09-05 11:44:59,837 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2019-09-05 11:44:59,837 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 11:44:59,838 INFO L399 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 11:44:59,838 INFO L418 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 11:44:59,838 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 11:44:59,838 INFO L82 PathProgramCache]: Analyzing trace with hash 1577839588, now seen corresponding path program 10 times [2019-09-05 11:44:59,838 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 11:44:59,838 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 11:44:59,839 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:44:59,839 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 11:44:59,840 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:44:59,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 11:45:00,321 INFO L134 CoverageAnalysis]: Checked inductivity of 280 backedges. 0 proven. 145 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2019-09-05 11:45:00,321 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 11:45:00,322 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) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 11:45:00,338 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-09-05 11:45:00,379 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-09-05 11:45:00,379 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 11:45:00,382 WARN L254 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 103 conjunts are in the unsatisfiable core [2019-09-05 11:45:00,386 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 11:45:00,527 INFO L134 CoverageAnalysis]: Checked inductivity of 280 backedges. 0 proven. 145 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [MP z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (11)] Exception during sending of exit command (exit): Broken pipe [2019-09-05 11:45:00,541 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-05 11:45:00,541 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24] total 25 [2019-09-05 11:45:00,542 INFO L454 AbstractCegarLoop]: Interpolant automaton has 25 states [2019-09-05 11:45:00,543 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2019-09-05 11:45:00,544 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=542, Unknown=0, NotChecked=0, Total=600 [2019-09-05 11:45:00,544 INFO L87 Difference]: Start difference. First operand 44 states and 53 transitions. Second operand 25 states. [2019-09-05 11:45:01,286 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 11:45:01,286 INFO L93 Difference]: Finished difference Result 54 states and 65 transitions. [2019-09-05 11:45:01,287 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2019-09-05 11:45:01,287 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 70 [2019-09-05 11:45:01,288 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 11:45:01,289 INFO L225 Difference]: With dead ends: 54 [2019-09-05 11:45:01,289 INFO L226 Difference]: Without dead ends: 49 [2019-09-05 11:45:01,290 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 68 SyntacticMatches, 12 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 57 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=108, Invalid=1082, Unknown=0, NotChecked=0, Total=1190 [2019-09-05 11:45:01,290 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2019-09-05 11:45:01,295 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 47. [2019-09-05 11:45:01,295 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2019-09-05 11:45:01,296 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 57 transitions. [2019-09-05 11:45:01,297 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 57 transitions. Word has length 70 [2019-09-05 11:45:01,297 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 11:45:01,297 INFO L475 AbstractCegarLoop]: Abstraction has 47 states and 57 transitions. [2019-09-05 11:45:01,297 INFO L476 AbstractCegarLoop]: Interpolant automaton has 25 states. [2019-09-05 11:45:01,297 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 57 transitions. [2019-09-05 11:45:01,299 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2019-09-05 11:45:01,299 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 11:45:01,299 INFO L399 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 11:45:01,299 INFO L418 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 11:45:01,300 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 11:45:01,300 INFO L82 PathProgramCache]: Analyzing trace with hash 153476482, now seen corresponding path program 11 times [2019-09-05 11:45:01,300 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 11:45:01,300 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 11:45:01,301 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:45:01,301 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 11:45:01,301 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:45:01,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 11:45:01,885 INFO L134 CoverageAnalysis]: Checked inductivity of 341 backedges. 0 proven. 176 refuted. 0 times theorem prover too weak. 165 trivial. 0 not checked. [2019-09-05 11:45:01,885 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 11:45:01,885 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 11:45:01,901 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2019-09-05 11:46:07,069 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2019-09-05 11:46:07,069 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 11:46:07,110 WARN L254 TraceCheckSpWp]: Trace formula consists of 176 conjuncts, 113 conjunts are in the unsatisfiable core [2019-09-05 11:46:07,112 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 11:46:07,221 INFO L134 CoverageAnalysis]: Checked inductivity of 341 backedges. 0 proven. 176 refuted. 0 times theorem prover too weak. 165 trivial. 0 not checked. [2019-09-05 11:46:07,227 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-05 11:46:07,227 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26] total 27 [2019-09-05 11:46:07,227 INFO L454 AbstractCegarLoop]: Interpolant automaton has 27 states [2019-09-05 11:46:07,228 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2019-09-05 11:46:07,228 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=639, Unknown=0, NotChecked=0, Total=702 [2019-09-05 11:46:07,228 INFO L87 Difference]: Start difference. First operand 47 states and 57 transitions. Second operand 27 states. [2019-09-05 11:46:08,097 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 11:46:08,097 INFO L93 Difference]: Finished difference Result 57 states and 69 transitions. [2019-09-05 11:46:08,098 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2019-09-05 11:46:08,098 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 76 [2019-09-05 11:46:08,098 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 11:46:08,099 INFO L225 Difference]: With dead ends: 57 [2019-09-05 11:46:08,100 INFO L226 Difference]: Without dead ends: 52 [2019-09-05 11:46:08,101 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 74 SyntacticMatches, 13 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 68 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=118, Invalid=1288, Unknown=0, NotChecked=0, Total=1406 [2019-09-05 11:46:08,101 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2019-09-05 11:46:08,106 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 50. [2019-09-05 11:46:08,106 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2019-09-05 11:46:08,107 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 61 transitions. [2019-09-05 11:46:08,107 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 61 transitions. Word has length 76 [2019-09-05 11:46:08,108 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 11:46:08,108 INFO L475 AbstractCegarLoop]: Abstraction has 50 states and 61 transitions. [2019-09-05 11:46:08,108 INFO L476 AbstractCegarLoop]: Interpolant automaton has 27 states. [2019-09-05 11:46:08,108 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 61 transitions. [2019-09-05 11:46:08,109 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2019-09-05 11:46:08,109 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 11:46:08,110 INFO L399 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 11:46:08,110 INFO L418 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 11:46:08,110 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 11:46:08,110 INFO L82 PathProgramCache]: Analyzing trace with hash -1587568480, now seen corresponding path program 12 times [2019-09-05 11:46:08,110 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 11:46:08,110 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 11:46:08,111 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:46:08,111 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 11:46:08,111 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:46:08,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 11:46:08,607 INFO L134 CoverageAnalysis]: Checked inductivity of 408 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 198 trivial. 0 not checked. [2019-09-05 11:46:08,608 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 11:46:08,608 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 11:46:08,619 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2019-09-05 11:46:08,735 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2019-09-05 11:46:08,735 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 11:46:08,738 WARN L254 TraceCheckSpWp]: Trace formula consists of 190 conjuncts, 123 conjunts are in the unsatisfiable core [2019-09-05 11:46:08,740 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 11:46:08,854 INFO L134 CoverageAnalysis]: Checked inductivity of 408 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 198 trivial. 0 not checked. [MP z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (13)] Exception during sending of exit command (exit): Broken pipe [2019-09-05 11:46:08,859 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-05 11:46:08,859 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28] total 29 [2019-09-05 11:46:08,860 INFO L454 AbstractCegarLoop]: Interpolant automaton has 29 states [2019-09-05 11:46:08,860 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2019-09-05 11:46:08,861 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=744, Unknown=0, NotChecked=0, Total=812 [2019-09-05 11:46:08,861 INFO L87 Difference]: Start difference. First operand 50 states and 61 transitions. Second operand 29 states. [2019-09-05 11:46:09,883 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 11:46:09,883 INFO L93 Difference]: Finished difference Result 60 states and 73 transitions. [2019-09-05 11:46:09,884 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2019-09-05 11:46:09,884 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 82 [2019-09-05 11:46:09,884 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 11:46:09,885 INFO L225 Difference]: With dead ends: 60 [2019-09-05 11:46:09,887 INFO L226 Difference]: Without dead ends: 55 [2019-09-05 11:46:09,888 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 80 SyntacticMatches, 14 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 80 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=128, Invalid=1512, Unknown=0, NotChecked=0, Total=1640 [2019-09-05 11:46:09,888 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2019-09-05 11:46:09,901 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 53. [2019-09-05 11:46:09,901 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2019-09-05 11:46:09,902 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 65 transitions. [2019-09-05 11:46:09,903 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 65 transitions. Word has length 82 [2019-09-05 11:46:09,906 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 11:46:09,906 INFO L475 AbstractCegarLoop]: Abstraction has 53 states and 65 transitions. [2019-09-05 11:46:09,907 INFO L476 AbstractCegarLoop]: Interpolant automaton has 29 states. [2019-09-05 11:46:09,907 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 65 transitions. [2019-09-05 11:46:09,908 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2019-09-05 11:46:09,908 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 11:46:09,908 INFO L399 BasicCegarLoop]: trace histogram [13, 13, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 11:46:09,908 INFO L418 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 11:46:09,909 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 11:46:09,909 INFO L82 PathProgramCache]: Analyzing trace with hash -50981570, now seen corresponding path program 13 times [2019-09-05 11:46:09,909 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 11:46:09,912 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 11:46:09,913 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:46:09,913 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 11:46:09,913 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:46:09,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 11:46:10,509 INFO L134 CoverageAnalysis]: Checked inductivity of 481 backedges. 0 proven. 247 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2019-09-05 11:46:10,509 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 11:46:10,509 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 11:46:10,529 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 11:46:10,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 11:46:10,579 WARN L254 TraceCheckSpWp]: Trace formula consists of 204 conjuncts, 133 conjunts are in the unsatisfiable core [2019-09-05 11:46:10,582 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 11:46:10,718 INFO L134 CoverageAnalysis]: Checked inductivity of 481 backedges. 0 proven. 247 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [MP z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (14)] Exception during sending of exit command (exit): Broken pipe [2019-09-05 11:46:10,731 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-05 11:46:10,731 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30] total 31 [2019-09-05 11:46:10,732 INFO L454 AbstractCegarLoop]: Interpolant automaton has 31 states [2019-09-05 11:46:10,732 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2019-09-05 11:46:10,732 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=857, Unknown=0, NotChecked=0, Total=930 [2019-09-05 11:46:10,733 INFO L87 Difference]: Start difference. First operand 53 states and 65 transitions. Second operand 31 states. [2019-09-05 11:46:11,828 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 11:46:11,828 INFO L93 Difference]: Finished difference Result 63 states and 77 transitions. [2019-09-05 11:46:11,829 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2019-09-05 11:46:11,829 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 88 [2019-09-05 11:46:11,829 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 11:46:11,830 INFO L225 Difference]: With dead ends: 63 [2019-09-05 11:46:11,831 INFO L226 Difference]: Without dead ends: 58 [2019-09-05 11:46:11,833 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 86 SyntacticMatches, 15 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 93 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=138, Invalid=1754, Unknown=0, NotChecked=0, Total=1892 [2019-09-05 11:46:11,833 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2019-09-05 11:46:11,838 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 56. [2019-09-05 11:46:11,838 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2019-09-05 11:46:11,839 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 69 transitions. [2019-09-05 11:46:11,839 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 69 transitions. Word has length 88 [2019-09-05 11:46:11,840 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 11:46:11,840 INFO L475 AbstractCegarLoop]: Abstraction has 56 states and 69 transitions. [2019-09-05 11:46:11,840 INFO L476 AbstractCegarLoop]: Interpolant automaton has 31 states. [2019-09-05 11:46:11,840 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 69 transitions. [2019-09-05 11:46:11,841 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2019-09-05 11:46:11,841 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 11:46:11,841 INFO L399 BasicCegarLoop]: trace histogram [14, 14, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 11:46:11,842 INFO L418 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 11:46:11,842 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 11:46:11,842 INFO L82 PathProgramCache]: Analyzing trace with hash -922870948, now seen corresponding path program 14 times [2019-09-05 11:46:11,842 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 11:46:11,842 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 11:46:11,843 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:46:11,843 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 11:46:11,843 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:46:11,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 11:46:12,508 INFO L134 CoverageAnalysis]: Checked inductivity of 560 backedges. 0 proven. 287 refuted. 0 times theorem prover too weak. 273 trivial. 0 not checked. [2019-09-05 11:46:12,509 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 11:46:12,509 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 11:46:12,519 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2019-09-05 11:46:12,551 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-09-05 11:46:12,551 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 11:46:12,553 WARN L254 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 143 conjunts are in the unsatisfiable core [2019-09-05 11:46:12,556 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 11:46:12,693 INFO L134 CoverageAnalysis]: Checked inductivity of 560 backedges. 0 proven. 287 refuted. 0 times theorem prover too weak. 273 trivial. 0 not checked. [2019-09-05 11:46:12,697 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-05 11:46:12,697 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32] total 33 [2019-09-05 11:46:12,699 INFO L454 AbstractCegarLoop]: Interpolant automaton has 33 states [2019-09-05 11:46:12,700 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2019-09-05 11:46:12,709 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=978, Unknown=0, NotChecked=0, Total=1056 [2019-09-05 11:46:12,710 INFO L87 Difference]: Start difference. First operand 56 states and 69 transitions. Second operand 33 states. [2019-09-05 11:46:13,952 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 11:46:13,953 INFO L93 Difference]: Finished difference Result 66 states and 81 transitions. [2019-09-05 11:46:13,953 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2019-09-05 11:46:13,953 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 94 [2019-09-05 11:46:13,954 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 11:46:13,955 INFO L225 Difference]: With dead ends: 66 [2019-09-05 11:46:13,955 INFO L226 Difference]: Without dead ends: 61 [2019-09-05 11:46:13,956 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 153 GetRequests, 92 SyntacticMatches, 16 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 107 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=148, Invalid=2014, Unknown=0, NotChecked=0, Total=2162 [2019-09-05 11:46:13,956 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2019-09-05 11:46:13,962 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 59. [2019-09-05 11:46:13,963 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2019-09-05 11:46:13,963 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 73 transitions. [2019-09-05 11:46:13,964 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 73 transitions. Word has length 94 [2019-09-05 11:46:13,964 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 11:46:13,964 INFO L475 AbstractCegarLoop]: Abstraction has 59 states and 73 transitions. [2019-09-05 11:46:13,964 INFO L476 AbstractCegarLoop]: Interpolant automaton has 33 states. [2019-09-05 11:46:13,965 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 73 transitions. [2019-09-05 11:46:13,966 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2019-09-05 11:46:13,966 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 11:46:13,966 INFO L399 BasicCegarLoop]: trace histogram [15, 15, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 11:46:13,966 INFO L418 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 11:46:13,966 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 11:46:13,966 INFO L82 PathProgramCache]: Analyzing trace with hash 124031738, now seen corresponding path program 15 times [2019-09-05 11:46:13,967 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 11:46:13,967 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 11:46:13,967 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:46:13,968 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 11:46:13,968 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:46:13,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 11:46:14,814 INFO L134 CoverageAnalysis]: Checked inductivity of 645 backedges. 0 proven. 330 refuted. 0 times theorem prover too weak. 315 trivial. 0 not checked. [2019-09-05 11:46:14,814 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 11:46:14,814 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 11:46:14,827 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-09-05 11:48:34,146 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2019-09-05 11:48:34,147 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 11:48:34,375 WARN L254 TraceCheckSpWp]: Trace formula consists of 232 conjuncts, 153 conjunts are in the unsatisfiable core [2019-09-05 11:48:34,378 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 11:48:34,505 INFO L134 CoverageAnalysis]: Checked inductivity of 645 backedges. 0 proven. 330 refuted. 0 times theorem prover too weak. 315 trivial. 0 not checked. [2019-09-05 11:48:34,512 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-05 11:48:34,513 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34] total 35 [2019-09-05 11:48:34,513 INFO L454 AbstractCegarLoop]: Interpolant automaton has 35 states [2019-09-05 11:48:34,513 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2019-09-05 11:48:34,514 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=1107, Unknown=0, NotChecked=0, Total=1190 [2019-09-05 11:48:34,514 INFO L87 Difference]: Start difference. First operand 59 states and 73 transitions. Second operand 35 states. [2019-09-05 11:48:35,921 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 11:48:35,921 INFO L93 Difference]: Finished difference Result 69 states and 85 transitions. [2019-09-05 11:48:35,922 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2019-09-05 11:48:35,922 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 100 [2019-09-05 11:48:35,923 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 11:48:35,924 INFO L225 Difference]: With dead ends: 69 [2019-09-05 11:48:35,924 INFO L226 Difference]: Without dead ends: 64 [2019-09-05 11:48:35,925 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 98 SyntacticMatches, 17 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 122 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=158, Invalid=2292, Unknown=0, NotChecked=0, Total=2450 [2019-09-05 11:48:35,925 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2019-09-05 11:48:35,930 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 62. [2019-09-05 11:48:35,930 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2019-09-05 11:48:35,931 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 77 transitions. [2019-09-05 11:48:35,931 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 77 transitions. Word has length 100 [2019-09-05 11:48:35,931 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 11:48:35,931 INFO L475 AbstractCegarLoop]: Abstraction has 62 states and 77 transitions. [2019-09-05 11:48:35,932 INFO L476 AbstractCegarLoop]: Interpolant automaton has 35 states. [2019-09-05 11:48:35,932 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 77 transitions. [2019-09-05 11:48:35,933 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2019-09-05 11:48:35,933 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 11:48:35,933 INFO L399 BasicCegarLoop]: trace histogram [16, 16, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 11:48:35,933 INFO L418 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 11:48:35,934 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 11:48:35,934 INFO L82 PathProgramCache]: Analyzing trace with hash 216947736, now seen corresponding path program 16 times [2019-09-05 11:48:35,934 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 11:48:35,934 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 11:48:35,935 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:48:35,935 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 11:48:35,935 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:48:35,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 11:48:36,833 INFO L134 CoverageAnalysis]: Checked inductivity of 736 backedges. 0 proven. 376 refuted. 0 times theorem prover too weak. 360 trivial. 0 not checked. [2019-09-05 11:48:36,833 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 11:48:36,833 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 11:48:36,844 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-09-05 11:48:36,887 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-09-05 11:48:36,887 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 11:48:36,890 WARN L254 TraceCheckSpWp]: Trace formula consists of 246 conjuncts, 163 conjunts are in the unsatisfiable core [2019-09-05 11:48:36,892 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 11:48:37,045 INFO L134 CoverageAnalysis]: Checked inductivity of 736 backedges. 0 proven. 376 refuted. 0 times theorem prover too weak. 360 trivial. 0 not checked. [2019-09-05 11:48:37,049 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-05 11:48:37,049 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36] total 37 [2019-09-05 11:48:37,050 INFO L454 AbstractCegarLoop]: Interpolant automaton has 37 states [2019-09-05 11:48:37,050 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2019-09-05 11:48:37,051 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=1244, Unknown=0, NotChecked=0, Total=1332 [2019-09-05 11:48:37,051 INFO L87 Difference]: Start difference. First operand 62 states and 77 transitions. Second operand 37 states. [2019-09-05 11:48:38,647 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 11:48:38,647 INFO L93 Difference]: Finished difference Result 72 states and 89 transitions. [2019-09-05 11:48:38,648 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2019-09-05 11:48:38,648 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 106 [2019-09-05 11:48:38,649 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 11:48:38,650 INFO L225 Difference]: With dead ends: 72 [2019-09-05 11:48:38,650 INFO L226 Difference]: Without dead ends: 67 [2019-09-05 11:48:38,651 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 173 GetRequests, 104 SyntacticMatches, 18 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 138 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=168, Invalid=2588, Unknown=0, NotChecked=0, Total=2756 [2019-09-05 11:48:38,652 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2019-09-05 11:48:38,656 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 65. [2019-09-05 11:48:38,657 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2019-09-05 11:48:38,658 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 81 transitions. [2019-09-05 11:48:38,658 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 81 transitions. Word has length 106 [2019-09-05 11:48:38,658 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 11:48:38,658 INFO L475 AbstractCegarLoop]: Abstraction has 65 states and 81 transitions. [2019-09-05 11:48:38,658 INFO L476 AbstractCegarLoop]: Interpolant automaton has 37 states. [2019-09-05 11:48:38,659 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 81 transitions. [2019-09-05 11:48:38,660 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2019-09-05 11:48:38,660 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 11:48:38,660 INFO L399 BasicCegarLoop]: trace histogram [17, 17, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 11:48:38,660 INFO L418 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 11:48:38,660 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 11:48:38,661 INFO L82 PathProgramCache]: Analyzing trace with hash -13085002, now seen corresponding path program 17 times [2019-09-05 11:48:38,661 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 11:48:38,661 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 11:48:38,661 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:48:38,662 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 11:48:38,662 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:48:38,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 11:48:39,673 INFO L134 CoverageAnalysis]: Checked inductivity of 833 backedges. 0 proven. 425 refuted. 0 times theorem prover too weak. 408 trivial. 0 not checked. [2019-09-05 11:48:39,673 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 11:48:39,674 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) [2019-09-05 11:48:39,694 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 11:50:38,689 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2019-09-05 11:50:38,689 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 11:50:40,077 WARN L254 TraceCheckSpWp]: Trace formula consists of 260 conjuncts, 173 conjunts are in the unsatisfiable core [2019-09-05 11:50:40,079 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 11:50:40,224 INFO L134 CoverageAnalysis]: Checked inductivity of 833 backedges. 0 proven. 425 refuted. 0 times theorem prover too weak. 408 trivial. 0 not checked. [2019-09-05 11:50:40,232 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-05 11:50:40,232 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38] total 39 [2019-09-05 11:50:40,232 INFO L454 AbstractCegarLoop]: Interpolant automaton has 39 states [2019-09-05 11:50:40,233 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2019-09-05 11:50:40,233 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=1389, Unknown=0, NotChecked=0, Total=1482 [2019-09-05 11:50:40,233 INFO L87 Difference]: Start difference. First operand 65 states and 81 transitions. Second operand 39 states. [2019-09-05 11:50:41,944 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 11:50:41,945 INFO L93 Difference]: Finished difference Result 75 states and 93 transitions. [2019-09-05 11:50:41,945 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2019-09-05 11:50:41,945 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 112 [2019-09-05 11:50:41,946 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 11:50:41,947 INFO L225 Difference]: With dead ends: 75 [2019-09-05 11:50:41,947 INFO L226 Difference]: Without dead ends: 70 [2019-09-05 11:50:41,949 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 183 GetRequests, 110 SyntacticMatches, 19 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 155 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=178, Invalid=2902, Unknown=0, NotChecked=0, Total=3080 [2019-09-05 11:50:41,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2019-09-05 11:50:41,954 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 68. [2019-09-05 11:50:41,954 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2019-09-05 11:50:41,955 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 85 transitions. [2019-09-05 11:50:41,955 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 85 transitions. Word has length 112 [2019-09-05 11:50:41,956 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 11:50:41,956 INFO L475 AbstractCegarLoop]: Abstraction has 68 states and 85 transitions. [2019-09-05 11:50:41,956 INFO L476 AbstractCegarLoop]: Interpolant automaton has 39 states. [2019-09-05 11:50:41,956 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 85 transitions. [2019-09-05 11:50:41,957 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2019-09-05 11:50:41,957 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 11:50:41,958 INFO L399 BasicCegarLoop]: trace histogram [18, 18, 18, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 11:50:41,958 INFO L418 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 11:50:41,958 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 11:50:41,958 INFO L82 PathProgramCache]: Analyzing trace with hash -759733548, now seen corresponding path program 18 times [2019-09-05 11:50:41,958 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 11:50:41,958 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 11:50:41,959 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:50:41,959 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 11:50:41,959 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:50:41,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 11:50:43,024 INFO L134 CoverageAnalysis]: Checked inductivity of 936 backedges. 0 proven. 477 refuted. 0 times theorem prover too weak. 459 trivial. 0 not checked. [2019-09-05 11:50:43,024 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 11:50:43,024 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 11:50:43,035 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2019-09-05 11:51:35,812 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2019-09-05 11:51:35,812 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 11:51:35,837 WARN L254 TraceCheckSpWp]: Trace formula consists of 274 conjuncts, 184 conjunts are in the unsatisfiable core [2019-09-05 11:51:35,840 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 11:51:36,011 INFO L134 CoverageAnalysis]: Checked inductivity of 936 backedges. 0 proven. 477 refuted. 0 times theorem prover too weak. 459 trivial. 0 not checked. [2019-09-05 11:51:36,018 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-05 11:51:36,018 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40] total 41 [2019-09-05 11:51:36,018 INFO L454 AbstractCegarLoop]: Interpolant automaton has 41 states [2019-09-05 11:51:36,019 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2019-09-05 11:51:36,019 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=1542, Unknown=0, NotChecked=0, Total=1640 [2019-09-05 11:51:36,019 INFO L87 Difference]: Start difference. First operand 68 states and 85 transitions. Second operand 41 states. [2019-09-05 11:51:38,018 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 11:51:38,018 INFO L93 Difference]: Finished difference Result 78 states and 97 transitions. [2019-09-05 11:51:38,023 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2019-09-05 11:51:38,024 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 118 [2019-09-05 11:51:38,024 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 11:51:38,025 INFO L225 Difference]: With dead ends: 78 [2019-09-05 11:51:38,025 INFO L226 Difference]: Without dead ends: 73 [2019-09-05 11:51:38,026 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 193 GetRequests, 115 SyntacticMatches, 21 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 175 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=188, Invalid=3234, Unknown=0, NotChecked=0, Total=3422 [2019-09-05 11:51:38,026 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2019-09-05 11:51:38,031 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 71. [2019-09-05 11:51:38,031 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2019-09-05 11:51:38,032 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 89 transitions. [2019-09-05 11:51:38,032 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 89 transitions. Word has length 118 [2019-09-05 11:51:38,033 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 11:51:38,033 INFO L475 AbstractCegarLoop]: Abstraction has 71 states and 89 transitions. [2019-09-05 11:51:38,033 INFO L476 AbstractCegarLoop]: Interpolant automaton has 41 states. [2019-09-05 11:51:38,034 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 89 transitions. [2019-09-05 11:51:38,037 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2019-09-05 11:51:38,037 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 11:51:38,038 INFO L399 BasicCegarLoop]: trace histogram [19, 19, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 11:51:38,038 INFO L418 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 11:51:38,038 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 11:51:38,038 INFO L82 PathProgramCache]: Analyzing trace with hash -927440782, now seen corresponding path program 19 times [2019-09-05 11:51:38,038 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 11:51:38,038 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 11:51:38,039 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:51:38,039 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 11:51:38,039 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:51:38,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 11:51:38,988 INFO L134 CoverageAnalysis]: Checked inductivity of 1045 backedges. 0 proven. 532 refuted. 0 times theorem prover too weak. 513 trivial. 0 not checked. [2019-09-05 11:51:38,988 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 11:51:38,988 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 11:51:38,998 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 11:51:39,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 11:51:39,039 WARN L254 TraceCheckSpWp]: Trace formula consists of 288 conjuncts, 193 conjunts are in the unsatisfiable core [2019-09-05 11:51:39,042 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 11:51:39,172 INFO L134 CoverageAnalysis]: Checked inductivity of 1045 backedges. 0 proven. 532 refuted. 0 times theorem prover too weak. 513 trivial. 0 not checked. [2019-09-05 11:51:39,175 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-05 11:51:39,175 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 42] total 43 [2019-09-05 11:51:39,176 INFO L454 AbstractCegarLoop]: Interpolant automaton has 43 states [2019-09-05 11:51:39,176 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2019-09-05 11:51:39,177 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=1703, Unknown=0, NotChecked=0, Total=1806 [2019-09-05 11:51:39,177 INFO L87 Difference]: Start difference. First operand 71 states and 89 transitions. Second operand 43 states. [2019-09-05 11:51:41,589 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 11:51:41,589 INFO L93 Difference]: Finished difference Result 81 states and 101 transitions. [2019-09-05 11:51:41,590 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2019-09-05 11:51:41,590 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 124 [2019-09-05 11:51:41,590 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 11:51:41,591 INFO L225 Difference]: With dead ends: 81 [2019-09-05 11:51:41,591 INFO L226 Difference]: Without dead ends: 76 [2019-09-05 11:51:41,593 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 203 GetRequests, 122 SyntacticMatches, 21 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 192 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=198, Invalid=3584, Unknown=0, NotChecked=0, Total=3782 [2019-09-05 11:51:41,594 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2019-09-05 11:51:41,598 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 74. [2019-09-05 11:51:41,598 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2019-09-05 11:51:41,599 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 93 transitions. [2019-09-05 11:51:41,599 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 93 transitions. Word has length 124 [2019-09-05 11:51:41,600 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 11:51:41,600 INFO L475 AbstractCegarLoop]: Abstraction has 74 states and 93 transitions. [2019-09-05 11:51:41,600 INFO L476 AbstractCegarLoop]: Interpolant automaton has 43 states. [2019-09-05 11:51:41,600 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 93 transitions. [2019-09-05 11:51:41,601 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2019-09-05 11:51:41,601 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 11:51:41,601 INFO L399 BasicCegarLoop]: trace histogram [20, 20, 20, 20, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 11:51:41,601 INFO L418 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 11:51:41,602 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 11:51:41,602 INFO L82 PathProgramCache]: Analyzing trace with hash 1835020176, now seen corresponding path program 20 times [2019-09-05 11:51:41,602 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 11:51:41,602 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 11:51:41,603 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:51:41,603 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 11:51:41,603 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:51:41,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 11:51:42,999 INFO L134 CoverageAnalysis]: Checked inductivity of 1160 backedges. 0 proven. 590 refuted. 0 times theorem prover too weak. 570 trivial. 0 not checked. [2019-09-05 11:51:42,999 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 11:51:42,999 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) [2019-09-05 11:51:43,015 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 11:51:43,069 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-09-05 11:51:43,069 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 11:51:43,075 WARN L254 TraceCheckSpWp]: Trace formula consists of 302 conjuncts, 203 conjunts are in the unsatisfiable core [2019-09-05 11:51:43,080 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 11:51:43,256 INFO L134 CoverageAnalysis]: Checked inductivity of 1160 backedges. 0 proven. 590 refuted. 0 times theorem prover too weak. 570 trivial. 0 not checked. [2019-09-05 11:51:43,260 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-05 11:51:43,260 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44] total 45 [2019-09-05 11:51:43,261 INFO L454 AbstractCegarLoop]: Interpolant automaton has 45 states [2019-09-05 11:51:43,261 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2019-09-05 11:51:43,262 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=1872, Unknown=0, NotChecked=0, Total=1980 [2019-09-05 11:51:43,262 INFO L87 Difference]: Start difference. First operand 74 states and 93 transitions. Second operand 45 states. [2019-09-05 11:51:45,546 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 11:51:45,546 INFO L93 Difference]: Finished difference Result 84 states and 105 transitions. [2019-09-05 11:51:45,550 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2019-09-05 11:51:45,550 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 130 [2019-09-05 11:51:45,550 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 11:51:45,551 INFO L225 Difference]: With dead ends: 84 [2019-09-05 11:51:45,551 INFO L226 Difference]: Without dead ends: 79 [2019-09-05 11:51:45,552 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 213 GetRequests, 128 SyntacticMatches, 22 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 212 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=208, Invalid=3952, Unknown=0, NotChecked=0, Total=4160 [2019-09-05 11:51:45,553 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2019-09-05 11:51:45,557 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 77. [2019-09-05 11:51:45,557 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2019-09-05 11:51:45,558 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 97 transitions. [2019-09-05 11:51:45,558 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 97 transitions. Word has length 130 [2019-09-05 11:51:45,559 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 11:51:45,559 INFO L475 AbstractCegarLoop]: Abstraction has 77 states and 97 transitions. [2019-09-05 11:51:45,559 INFO L476 AbstractCegarLoop]: Interpolant automaton has 45 states. [2019-09-05 11:51:45,559 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 97 transitions. [2019-09-05 11:51:45,560 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2019-09-05 11:51:45,561 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 11:51:45,561 INFO L399 BasicCegarLoop]: trace histogram [21, 21, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 11:51:45,561 INFO L418 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 11:51:45,561 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 11:51:45,561 INFO L82 PathProgramCache]: Analyzing trace with hash 363573294, now seen corresponding path program 21 times [2019-09-05 11:51:45,561 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 11:51:45,562 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 11:51:45,562 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:51:45,562 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 11:51:45,562 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:51:45,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 11:51:46,844 INFO L134 CoverageAnalysis]: Checked inductivity of 1281 backedges. 0 proven. 651 refuted. 0 times theorem prover too weak. 630 trivial. 0 not checked. [2019-09-05 11:51:46,844 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 11:51:46,844 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 11:51:46,855 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-09-05 11:54:22,418 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2019-09-05 11:54:22,419 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 11:54:22,533 WARN L254 TraceCheckSpWp]: Trace formula consists of 316 conjuncts, 213 conjunts are in the unsatisfiable core [2019-09-05 11:54:22,536 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 11:54:22,692 INFO L134 CoverageAnalysis]: Checked inductivity of 1281 backedges. 0 proven. 651 refuted. 0 times theorem prover too weak. 630 trivial. 0 not checked. [2019-09-05 11:54:22,699 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-05 11:54:22,700 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 46] total 47 [2019-09-05 11:54:22,700 INFO L454 AbstractCegarLoop]: Interpolant automaton has 47 states [2019-09-05 11:54:22,700 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2019-09-05 11:54:22,701 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=2049, Unknown=0, NotChecked=0, Total=2162 [2019-09-05 11:54:22,701 INFO L87 Difference]: Start difference. First operand 77 states and 97 transitions. Second operand 47 states. [2019-09-05 11:54:25,181 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 11:54:25,181 INFO L93 Difference]: Finished difference Result 87 states and 109 transitions. [2019-09-05 11:54:25,181 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2019-09-05 11:54:25,181 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 136 [2019-09-05 11:54:25,182 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 11:54:25,183 INFO L225 Difference]: With dead ends: 87 [2019-09-05 11:54:25,183 INFO L226 Difference]: Without dead ends: 82 [2019-09-05 11:54:25,185 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 223 GetRequests, 134 SyntacticMatches, 23 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 233 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=218, Invalid=4338, Unknown=0, NotChecked=0, Total=4556 [2019-09-05 11:54:25,185 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2019-09-05 11:54:25,189 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 80. [2019-09-05 11:54:25,189 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2019-09-05 11:54:25,190 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 101 transitions. [2019-09-05 11:54:25,190 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 101 transitions. Word has length 136 [2019-09-05 11:54:25,191 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 11:54:25,191 INFO L475 AbstractCegarLoop]: Abstraction has 80 states and 101 transitions. [2019-09-05 11:54:25,191 INFO L476 AbstractCegarLoop]: Interpolant automaton has 47 states. [2019-09-05 11:54:25,191 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 101 transitions. [2019-09-05 11:54:25,192 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 143 [2019-09-05 11:54:25,192 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 11:54:25,193 INFO L399 BasicCegarLoop]: trace histogram [22, 22, 22, 22, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 11:54:25,193 INFO L418 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 11:54:25,193 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 11:54:25,193 INFO L82 PathProgramCache]: Analyzing trace with hash -579878324, now seen corresponding path program 22 times [2019-09-05 11:54:25,193 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 11:54:25,193 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 11:54:25,194 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:54:25,194 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 11:54:25,194 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:54:25,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 11:54:26,502 INFO L134 CoverageAnalysis]: Checked inductivity of 1408 backedges. 0 proven. 715 refuted. 0 times theorem prover too weak. 693 trivial. 0 not checked. [2019-09-05 11:54:26,503 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 11:54:26,503 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 11:54:26,514 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-09-05 11:54:26,560 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-09-05 11:54:26,561 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 11:54:26,564 WARN L254 TraceCheckSpWp]: Trace formula consists of 330 conjuncts, 223 conjunts are in the unsatisfiable core [2019-09-05 11:54:26,567 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 11:54:26,741 INFO L134 CoverageAnalysis]: Checked inductivity of 1408 backedges. 0 proven. 715 refuted. 0 times theorem prover too weak. 693 trivial. 0 not checked. [MP z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (23)] Exception during sending of exit command (exit): Broken pipe [2019-09-05 11:54:26,746 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-05 11:54:26,746 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48] total 49 [2019-09-05 11:54:26,747 INFO L454 AbstractCegarLoop]: Interpolant automaton has 49 states [2019-09-05 11:54:26,747 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2019-09-05 11:54:26,748 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=2234, Unknown=0, NotChecked=0, Total=2352 [2019-09-05 11:54:26,748 INFO L87 Difference]: Start difference. First operand 80 states and 101 transitions. Second operand 49 states. [2019-09-05 11:54:29,711 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 11:54:29,711 INFO L93 Difference]: Finished difference Result 90 states and 113 transitions. [2019-09-05 11:54:29,712 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2019-09-05 11:54:29,712 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 142 [2019-09-05 11:54:29,712 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 11:54:29,714 INFO L225 Difference]: With dead ends: 90 [2019-09-05 11:54:29,714 INFO L226 Difference]: Without dead ends: 85 [2019-09-05 11:54:29,716 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 233 GetRequests, 140 SyntacticMatches, 24 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 255 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=228, Invalid=4742, Unknown=0, NotChecked=0, Total=4970 [2019-09-05 11:54:29,716 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2019-09-05 11:54:29,720 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 83. [2019-09-05 11:54:29,720 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2019-09-05 11:54:29,721 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 105 transitions. [2019-09-05 11:54:29,721 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 105 transitions. Word has length 142 [2019-09-05 11:54:29,722 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 11:54:29,722 INFO L475 AbstractCegarLoop]: Abstraction has 83 states and 105 transitions. [2019-09-05 11:54:29,722 INFO L476 AbstractCegarLoop]: Interpolant automaton has 49 states. [2019-09-05 11:54:29,722 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 105 transitions. [2019-09-05 11:54:29,723 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 149 [2019-09-05 11:54:29,723 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 11:54:29,723 INFO L399 BasicCegarLoop]: trace histogram [23, 23, 23, 23, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 11:54:29,723 INFO L418 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 11:54:29,724 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 11:54:29,724 INFO L82 PathProgramCache]: Analyzing trace with hash 626607594, now seen corresponding path program 23 times [2019-09-05 11:54:29,724 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 11:54:29,724 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 11:54:29,724 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:54:29,725 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 11:54:29,725 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:54:29,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 11:54:31,258 INFO L134 CoverageAnalysis]: Checked inductivity of 1541 backedges. 0 proven. 782 refuted. 0 times theorem prover too weak. 759 trivial. 0 not checked. [2019-09-05 11:54:31,258 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 11:54:31,258 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 11:54:31,268 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1