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/array-examples/standard_palindrome_ground.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-673a906-m [2019-10-01 23:26:09,508 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-01 23:26:09,511 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-01 23:26:09,525 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-10-01 23:26:09,526 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-10-01 23:26:09,528 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-10-01 23:26:09,530 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-10-01 23:26:09,540 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-10-01 23:26:09,542 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-10-01 23:26:09,548 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-10-01 23:26:09,549 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-10-01 23:26:09,550 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-10-01 23:26:09,550 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-01 23:26:09,553 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-01 23:26:09,554 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-01 23:26:09,557 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-01 23:26:09,559 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-01 23:26:09,560 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-01 23:26:09,565 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-01 23:26:09,570 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-01 23:26:09,572 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-01 23:26:09,576 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-01 23:26:09,579 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-01 23:26:09,581 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-01 23:26:09,584 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-10-01 23:26:09,591 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-10-01 23:26:09,593 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-10-01 23:26:09,593 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-10-01 23:26:09,594 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-10-01 23:26:09,597 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-10-01 23:26:09,597 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-10-01 23:26:09,598 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-10-01 23:26:09,598 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-10-01 23:26:09,598 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-01 23:26:09,599 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-01 23:26:09,600 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-01 23:26:09,602 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 [2019-10-01 23:26:09,626 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-01 23:26:09,626 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-01 23:26:09,629 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-01 23:26:09,629 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-01 23:26:09,629 INFO L138 SettingsManager]: * Use SBE=true [2019-10-01 23:26:09,630 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-01 23:26:09,630 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-01 23:26:09,630 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-01 23:26:09,630 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-01 23:26:09,631 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-01 23:26:09,632 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-01 23:26:09,632 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-01 23:26:09,632 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-01 23:26:09,633 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-01 23:26:09,633 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-01 23:26:09,633 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-01 23:26:09,634 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-01 23:26:09,634 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-01 23:26:09,634 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-01 23:26:09,634 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-01 23:26:09,635 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-01 23:26:09,635 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-01 23:26:09,635 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-01 23:26:09,635 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-01 23:26:09,636 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-01 23:26:09,636 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-01 23:26:09,636 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-01 23:26:09,636 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-01 23:26:09,637 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-10-01 23:26:09,692 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-01 23:26:09,712 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-01 23:26:09,717 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-01 23:26:09,719 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-01 23:26:09,720 INFO L275 PluginConnector]: CDTParser initialized [2019-10-01 23:26:09,720 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-examples/standard_palindrome_ground.i [2019-10-01 23:26:09,802 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d0afbfd6a/7f7c616890764a31b3a8e6085d9304cb/FLAG33578db78 [2019-10-01 23:26:10,342 INFO L306 CDTParser]: Found 1 translation units. [2019-10-01 23:26:10,343 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-examples/standard_palindrome_ground.i [2019-10-01 23:26:10,354 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d0afbfd6a/7f7c616890764a31b3a8e6085d9304cb/FLAG33578db78 [2019-10-01 23:26:10,748 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d0afbfd6a/7f7c616890764a31b3a8e6085d9304cb [2019-10-01 23:26:10,759 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-01 23:26:10,760 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-01 23:26:10,761 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-01 23:26:10,762 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-01 23:26:10,765 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-01 23:26:10,766 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.10 11:26:10" (1/1) ... [2019-10-01 23:26:10,769 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@17ca079d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.10 11:26:10, skipping insertion in model container [2019-10-01 23:26:10,770 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.10 11:26:10" (1/1) ... [2019-10-01 23:26:10,778 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-01 23:26:10,794 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-01 23:26:10,997 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-01 23:26:11,001 INFO L188 MainTranslator]: Completed pre-run [2019-10-01 23:26:11,020 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-01 23:26:11,038 INFO L192 MainTranslator]: Completed translation [2019-10-01 23:26:11,038 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.10 11:26:11 WrapperNode [2019-10-01 23:26:11,038 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-01 23:26:11,039 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-01 23:26:11,039 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-01 23:26:11,040 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-01 23:26:11,142 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.10 11:26:11" (1/1) ... [2019-10-01 23:26:11,143 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.10 11:26:11" (1/1) ... [2019-10-01 23:26:11,152 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.10 11:26:11" (1/1) ... [2019-10-01 23:26:11,152 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.10 11:26:11" (1/1) ... [2019-10-01 23:26:11,159 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.10 11:26:11" (1/1) ... [2019-10-01 23:26:11,165 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.10 11:26:11" (1/1) ... [2019-10-01 23:26:11,166 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.10 11:26:11" (1/1) ... [2019-10-01 23:26:11,169 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-01 23:26:11,169 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-01 23:26:11,169 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-01 23:26:11,169 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-01 23:26:11,170 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.10 11:26:11" (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 [2019-10-01 23:26:11,228 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-01 23:26:11,229 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-01 23:26:11,229 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-10-01 23:26:11,229 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-01 23:26:11,229 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-01 23:26:11,229 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-10-01 23:26:11,229 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-10-01 23:26:11,230 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-01 23:26:11,230 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-10-01 23:26:11,230 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-10-01 23:26:11,230 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-10-01 23:26:11,230 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-10-01 23:26:11,230 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-01 23:26:11,231 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-01 23:26:11,500 INFO L278 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-01 23:26:11,506 INFO L283 CfgBuilder]: Removed 3 assume(true) statements. [2019-10-01 23:26:11,508 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.10 11:26:11 BoogieIcfgContainer [2019-10-01 23:26:11,508 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-01 23:26:11,515 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-01 23:26:11,515 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-01 23:26:11,521 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-01 23:26:11,521 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 01.10 11:26:10" (1/3) ... [2019-10-01 23:26:11,526 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@40c1c555 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.10 11:26:11, skipping insertion in model container [2019-10-01 23:26:11,527 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.10 11:26:11" (2/3) ... [2019-10-01 23:26:11,527 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@40c1c555 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.10 11:26:11, skipping insertion in model container [2019-10-01 23:26:11,527 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.10 11:26:11" (3/3) ... [2019-10-01 23:26:11,534 INFO L109 eAbstractionObserver]: Analyzing ICFG standard_palindrome_ground.i [2019-10-01 23:26:11,544 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-01 23:26:11,552 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-01 23:26:11,570 INFO L252 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-01 23:26:11,595 INFO L128 ementStrategyFactory]: Using default assertion order modulation [2019-10-01 23:26:11,596 INFO L377 AbstractCegarLoop]: Interprodecural is true [2019-10-01 23:26:11,597 INFO L378 AbstractCegarLoop]: Hoare is true [2019-10-01 23:26:11,597 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-01 23:26:11,597 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-01 23:26:11,597 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-01 23:26:11,598 INFO L382 AbstractCegarLoop]: Difference is false [2019-10-01 23:26:11,598 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-01 23:26:11,598 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-01 23:26:11,620 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states. [2019-10-01 23:26:11,626 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-10-01 23:26:11,626 INFO L403 BasicCegarLoop]: Found error trace [2019-10-01 23:26:11,627 INFO L411 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-01 23:26:11,630 INFO L418 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-01 23:26:11,636 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-01 23:26:11,636 INFO L82 PathProgramCache]: Analyzing trace with hash 1778002988, now seen corresponding path program 1 times [2019-10-01 23:26:11,638 INFO L224 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-10-01 23:26:11,639 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-10-01 23:26:11,684 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-01 23:26:11,684 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-01 23:26:11,685 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-01 23:26:11,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-01 23:26:11,765 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-01 23:26:11,767 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-01 23:26:11,768 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2019-10-01 23:26:11,771 INFO L454 AbstractCegarLoop]: Interpolant automaton has 2 states [2019-10-01 23:26:11,781 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2019-10-01 23:26:11,782 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-10-01 23:26:11,784 INFO L87 Difference]: Start difference. First operand 27 states. Second operand 2 states. [2019-10-01 23:26:11,804 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-01 23:26:11,804 INFO L93 Difference]: Finished difference Result 46 states and 57 transitions. [2019-10-01 23:26:11,805 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2019-10-01 23:26:11,806 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 15 [2019-10-01 23:26:11,806 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-01 23:26:11,815 INFO L225 Difference]: With dead ends: 46 [2019-10-01 23:26:11,815 INFO L226 Difference]: Without dead ends: 22 [2019-10-01 23:26:11,819 INFO L640 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 [2019-10-01 23:26:11,837 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2019-10-01 23:26:11,856 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2019-10-01 23:26:11,857 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2019-10-01 23:26:11,858 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2019-10-01 23:26:11,859 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 15 [2019-10-01 23:26:11,860 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-01 23:26:11,860 INFO L475 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2019-10-01 23:26:11,860 INFO L476 AbstractCegarLoop]: Interpolant automaton has 2 states. [2019-10-01 23:26:11,860 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2019-10-01 23:26:11,861 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-10-01 23:26:11,861 INFO L403 BasicCegarLoop]: Found error trace [2019-10-01 23:26:11,861 INFO L411 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-01 23:26:11,862 INFO L418 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-01 23:26:11,862 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-01 23:26:11,862 INFO L82 PathProgramCache]: Analyzing trace with hash -262172122, now seen corresponding path program 1 times [2019-10-01 23:26:11,862 INFO L224 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-10-01 23:26:11,863 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-10-01 23:26:11,865 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-01 23:26:11,865 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-01 23:26:11,865 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-01 23:26:11,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-01 23:26:11,929 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-01 23:26:11,930 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-01 23:26:11,930 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-10-01 23:26:11,934 INFO L454 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-01 23:26:11,935 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-01 23:26:11,935 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-01 23:26:11,935 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand 3 states. [2019-10-01 23:26:11,999 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-01 23:26:11,999 INFO L93 Difference]: Finished difference Result 40 states and 45 transitions. [2019-10-01 23:26:12,000 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-01 23:26:12,000 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 15 [2019-10-01 23:26:12,000 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-01 23:26:12,001 INFO L225 Difference]: With dead ends: 40 [2019-10-01 23:26:12,001 INFO L226 Difference]: Without dead ends: 26 [2019-10-01 23:26:12,003 INFO L640 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-01 23:26:12,003 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2019-10-01 23:26:12,008 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 24. [2019-10-01 23:26:12,008 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2019-10-01 23:26:12,009 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2019-10-01 23:26:12,009 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 15 [2019-10-01 23:26:12,009 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-01 23:26:12,010 INFO L475 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2019-10-01 23:26:12,010 INFO L476 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-01 23:26:12,010 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2019-10-01 23:26:12,011 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2019-10-01 23:26:12,011 INFO L403 BasicCegarLoop]: Found error trace [2019-10-01 23:26:12,011 INFO L411 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-01 23:26:12,011 INFO L418 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-01 23:26:12,011 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-01 23:26:12,012 INFO L82 PathProgramCache]: Analyzing trace with hash 1323409058, now seen corresponding path program 1 times [2019-10-01 23:26:12,012 INFO L224 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-10-01 23:26:12,012 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-10-01 23:26:12,014 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-01 23:26:12,014 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-01 23:26:12,014 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-01 23:26:12,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-01 23:26:12,100 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-01 23:26:12,101 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-10-01 23:26:12,101 INFO L224 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 [2019-10-01 23:26:12,126 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-01 23:26:12,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-01 23:26:12,159 INFO L256 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 3 conjunts are in the unsatisfiable core [2019-10-01 23:26:12,166 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-01 23:26:12,200 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-01 23:26:12,212 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-01 23:26:12,214 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2019-10-01 23:26:12,215 INFO L454 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-10-01 23:26:12,215 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-10-01 23:26:12,216 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2019-10-01 23:26:12,216 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand 5 states. [2019-10-01 23:26:12,293 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-01 23:26:12,294 INFO L93 Difference]: Finished difference Result 45 states and 50 transitions. [2019-10-01 23:26:12,295 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-01 23:26:12,295 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 19 [2019-10-01 23:26:12,295 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-01 23:26:12,297 INFO L225 Difference]: With dead ends: 45 [2019-10-01 23:26:12,297 INFO L226 Difference]: Without dead ends: 30 [2019-10-01 23:26:12,298 INFO L640 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2019-10-01 23:26:12,298 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2019-10-01 23:26:12,308 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 28. [2019-10-01 23:26:12,309 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2019-10-01 23:26:12,312 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2019-10-01 23:26:12,312 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 19 [2019-10-01 23:26:12,313 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-01 23:26:12,313 INFO L475 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2019-10-01 23:26:12,313 INFO L476 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-10-01 23:26:12,313 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2019-10-01 23:26:12,314 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2019-10-01 23:26:12,315 INFO L403 BasicCegarLoop]: Found error trace [2019-10-01 23:26:12,315 INFO L411 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-01 23:26:12,315 INFO L418 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-01 23:26:12,315 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-01 23:26:12,316 INFO L82 PathProgramCache]: Analyzing trace with hash 1582955806, now seen corresponding path program 2 times [2019-10-01 23:26:12,316 INFO L224 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-10-01 23:26:12,316 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-10-01 23:26:12,321 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-01 23:26:12,322 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-01 23:26:12,322 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-01 23:26:12,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-01 23:26:12,426 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-01 23:26:12,427 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-10-01 23:26:12,427 INFO L224 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) [2019-10-01 23:26:12,453 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-10-01 23:26:12,481 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-01 23:26:12,482 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-01 23:26:12,483 INFO L256 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 4 conjunts are in the unsatisfiable core [2019-10-01 23:26:12,485 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-01 23:26:12,502 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [MP z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (3)] Exception during sending of exit command (exit): Stream closed [2019-10-01 23:26:12,508 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-01 23:26:12,508 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2019-10-01 23:26:12,508 INFO L454 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-10-01 23:26:12,509 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-10-01 23:26:12,509 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2019-10-01 23:26:12,509 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand 6 states. [2019-10-01 23:26:12,575 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-01 23:26:12,575 INFO L93 Difference]: Finished difference Result 51 states and 56 transitions. [2019-10-01 23:26:12,577 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-10-01 23:26:12,578 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 23 [2019-10-01 23:26:12,578 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-01 23:26:12,579 INFO L225 Difference]: With dead ends: 51 [2019-10-01 23:26:12,579 INFO L226 Difference]: Without dead ends: 34 [2019-10-01 23:26:12,580 INFO L640 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2019-10-01 23:26:12,580 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2019-10-01 23:26:12,586 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 32. [2019-10-01 23:26:12,586 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2019-10-01 23:26:12,587 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2019-10-01 23:26:12,587 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 23 [2019-10-01 23:26:12,588 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-01 23:26:12,588 INFO L475 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2019-10-01 23:26:12,588 INFO L476 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-10-01 23:26:12,588 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2019-10-01 23:26:12,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2019-10-01 23:26:12,590 INFO L403 BasicCegarLoop]: Found error trace [2019-10-01 23:26:12,591 INFO L411 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-01 23:26:12,591 INFO L418 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-01 23:26:12,591 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-01 23:26:12,591 INFO L82 PathProgramCache]: Analyzing trace with hash -657216102, now seen corresponding path program 3 times [2019-10-01 23:26:12,592 INFO L224 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-10-01 23:26:12,592 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-10-01 23:26:12,595 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-01 23:26:12,595 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-10-01 23:26:12,595 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-01 23:26:12,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-01 23:26:12,684 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-10-01 23:26:12,684 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-10-01 23:26:12,684 INFO L224 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) [2019-10-01 23:26:12,709 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 [2019-10-01 23:26:12,742 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2019-10-01 23:26:12,743 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-01 23:26:12,744 INFO L256 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 5 conjunts are in the unsatisfiable core [2019-10-01 23:26:12,746 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-01 23:26:12,767 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [MP z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (4)] Exception during sending of exit command (exit): Broken pipe [2019-10-01 23:26:12,773 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-01 23:26:12,773 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 7 [2019-10-01 23:26:12,773 INFO L454 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-10-01 23:26:12,774 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-10-01 23:26:12,774 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2019-10-01 23:26:12,774 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand 7 states. [2019-10-01 23:26:12,860 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-01 23:26:12,862 INFO L93 Difference]: Finished difference Result 57 states and 62 transitions. [2019-10-01 23:26:12,863 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-10-01 23:26:12,863 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 27 [2019-10-01 23:26:12,864 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-01 23:26:12,864 INFO L225 Difference]: With dead ends: 57 [2019-10-01 23:26:12,865 INFO L226 Difference]: Without dead ends: 38 [2019-10-01 23:26:12,865 INFO L640 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2019-10-01 23:26:12,866 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2019-10-01 23:26:12,870 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 36. [2019-10-01 23:26:12,871 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2019-10-01 23:26:12,872 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2019-10-01 23:26:12,872 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 27 [2019-10-01 23:26:12,872 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-01 23:26:12,873 INFO L475 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2019-10-01 23:26:12,873 INFO L476 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-10-01 23:26:12,873 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2019-10-01 23:26:12,874 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2019-10-01 23:26:12,874 INFO L403 BasicCegarLoop]: Found error trace [2019-10-01 23:26:12,874 INFO L411 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-01 23:26:12,874 INFO L418 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-01 23:26:12,874 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-01 23:26:12,875 INFO L82 PathProgramCache]: Analyzing trace with hash 702132246, now seen corresponding path program 4 times [2019-10-01 23:26:12,875 INFO L224 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-10-01 23:26:12,875 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-10-01 23:26:12,876 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-01 23:26:12,876 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-10-01 23:26:12,877 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-01 23:26:12,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-01 23:26:13,007 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2019-10-01 23:26:13,007 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-10-01 23:26:13,008 INFO L224 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 [2019-10-01 23:26:13,033 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-10-01 23:26:13,073 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-01 23:26:13,074 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-01 23:26:13,075 INFO L256 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 6 conjunts are in the unsatisfiable core [2019-10-01 23:26:13,079 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-01 23:26:13,104 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2019-10-01 23:26:13,111 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-01 23:26:13,112 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 8 [2019-10-01 23:26:13,113 INFO L454 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-10-01 23:26:13,113 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-10-01 23:26:13,114 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2019-10-01 23:26:13,115 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand 8 states. [2019-10-01 23:26:13,188 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-01 23:26:13,188 INFO L93 Difference]: Finished difference Result 63 states and 68 transitions. [2019-10-01 23:26:13,189 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-10-01 23:26:13,189 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 31 [2019-10-01 23:26:13,189 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-01 23:26:13,190 INFO L225 Difference]: With dead ends: 63 [2019-10-01 23:26:13,190 INFO L226 Difference]: Without dead ends: 42 [2019-10-01 23:26:13,191 INFO L640 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2019-10-01 23:26:13,191 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2019-10-01 23:26:13,196 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 40. [2019-10-01 23:26:13,196 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2019-10-01 23:26:13,197 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 42 transitions. [2019-10-01 23:26:13,197 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 42 transitions. Word has length 31 [2019-10-01 23:26:13,197 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-01 23:26:13,198 INFO L475 AbstractCegarLoop]: Abstraction has 40 states and 42 transitions. [2019-10-01 23:26:13,198 INFO L476 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-10-01 23:26:13,198 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 42 transitions. [2019-10-01 23:26:13,199 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2019-10-01 23:26:13,199 INFO L403 BasicCegarLoop]: Found error trace [2019-10-01 23:26:13,199 INFO L411 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-01 23:26:13,199 INFO L418 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-01 23:26:13,200 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-01 23:26:13,200 INFO L82 PathProgramCache]: Analyzing trace with hash -294189934, now seen corresponding path program 5 times [2019-10-01 23:26:13,200 INFO L224 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-10-01 23:26:13,200 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-10-01 23:26:13,201 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-01 23:26:13,202 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-10-01 23:26:13,202 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-01 23:26:13,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-01 23:26:13,307 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2019-10-01 23:26:13,307 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-10-01 23:26:13,308 INFO L224 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) [2019-10-01 23:26:13,329 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 [2019-10-01 23:26:13,470 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2019-10-01 23:26:13,471 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-01 23:26:13,473 INFO L256 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 7 conjunts are in the unsatisfiable core [2019-10-01 23:26:13,476 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-01 23:26:13,504 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2019-10-01 23:26:13,514 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-01 23:26:13,515 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 9 [2019-10-01 23:26:13,515 INFO L454 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-10-01 23:26:13,516 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-10-01 23:26:13,516 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2019-10-01 23:26:13,516 INFO L87 Difference]: Start difference. First operand 40 states and 42 transitions. Second operand 9 states. [2019-10-01 23:26:13,602 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-01 23:26:13,603 INFO L93 Difference]: Finished difference Result 69 states and 74 transitions. [2019-10-01 23:26:13,603 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-10-01 23:26:13,603 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 35 [2019-10-01 23:26:13,604 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-01 23:26:13,604 INFO L225 Difference]: With dead ends: 69 [2019-10-01 23:26:13,604 INFO L226 Difference]: Without dead ends: 46 [2019-10-01 23:26:13,605 INFO L640 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2019-10-01 23:26:13,606 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2019-10-01 23:26:13,610 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 44. [2019-10-01 23:26:13,611 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2019-10-01 23:26:13,611 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 46 transitions. [2019-10-01 23:26:13,612 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 46 transitions. Word has length 35 [2019-10-01 23:26:13,612 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-01 23:26:13,612 INFO L475 AbstractCegarLoop]: Abstraction has 44 states and 46 transitions. [2019-10-01 23:26:13,612 INFO L476 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-10-01 23:26:13,612 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 46 transitions. [2019-10-01 23:26:13,613 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2019-10-01 23:26:13,614 INFO L403 BasicCegarLoop]: Found error trace [2019-10-01 23:26:13,614 INFO L411 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-01 23:26:13,614 INFO L418 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-01 23:26:13,614 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-01 23:26:13,614 INFO L82 PathProgramCache]: Analyzing trace with hash 1966517006, now seen corresponding path program 6 times [2019-10-01 23:26:13,615 INFO L224 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-10-01 23:26:13,615 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-10-01 23:26:13,616 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-01 23:26:13,616 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-10-01 23:26:13,616 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-01 23:26:13,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-01 23:26:13,695 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2019-10-01 23:26:13,696 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-10-01 23:26:13,696 INFO L224 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 [2019-10-01 23:26:13,729 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2019-10-01 23:26:13,825 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2019-10-01 23:26:13,825 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-01 23:26:13,827 INFO L256 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 8 conjunts are in the unsatisfiable core [2019-10-01 23:26:13,829 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-01 23:26:13,848 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2019-10-01 23:26:13,854 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-01 23:26:13,854 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 10 [2019-10-01 23:26:13,855 INFO L454 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-10-01 23:26:13,855 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-10-01 23:26:13,855 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2019-10-01 23:26:13,856 INFO L87 Difference]: Start difference. First operand 44 states and 46 transitions. Second operand 10 states. [2019-10-01 23:26:13,951 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-01 23:26:13,951 INFO L93 Difference]: Finished difference Result 75 states and 80 transitions. [2019-10-01 23:26:13,953 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-10-01 23:26:13,953 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 39 [2019-10-01 23:26:13,954 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-01 23:26:13,954 INFO L225 Difference]: With dead ends: 75 [2019-10-01 23:26:13,954 INFO L226 Difference]: Without dead ends: 50 [2019-10-01 23:26:13,955 INFO L640 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2019-10-01 23:26:13,958 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2019-10-01 23:26:13,965 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 48. [2019-10-01 23:26:13,966 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2019-10-01 23:26:13,966 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 50 transitions. [2019-10-01 23:26:13,967 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 50 transitions. Word has length 39 [2019-10-01 23:26:13,967 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-01 23:26:13,967 INFO L475 AbstractCegarLoop]: Abstraction has 48 states and 50 transitions. [2019-10-01 23:26:13,967 INFO L476 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-10-01 23:26:13,968 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 50 transitions. [2019-10-01 23:26:13,969 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2019-10-01 23:26:13,969 INFO L403 BasicCegarLoop]: Found error trace [2019-10-01 23:26:13,969 INFO L411 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-01 23:26:13,969 INFO L418 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-01 23:26:13,970 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-01 23:26:13,970 INFO L82 PathProgramCache]: Analyzing trace with hash 1042523018, now seen corresponding path program 7 times [2019-10-01 23:26:13,970 INFO L224 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-10-01 23:26:13,970 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-10-01 23:26:13,971 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-01 23:26:13,972 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-10-01 23:26:13,972 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-01 23:26:14,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-01 23:26:14,144 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2019-10-01 23:26:14,144 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-10-01 23:26:14,144 INFO L224 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 [2019-10-01 23:26:14,174 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-01 23:26:14,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-01 23:26:14,211 INFO L256 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 9 conjunts are in the unsatisfiable core [2019-10-01 23:26:14,222 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-01 23:26:14,259 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2019-10-01 23:26:14,266 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-01 23:26:14,267 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 11 [2019-10-01 23:26:14,267 INFO L454 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-10-01 23:26:14,267 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-10-01 23:26:14,268 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2019-10-01 23:26:14,268 INFO L87 Difference]: Start difference. First operand 48 states and 50 transitions. Second operand 11 states. [2019-10-01 23:26:14,365 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-01 23:26:14,365 INFO L93 Difference]: Finished difference Result 81 states and 86 transitions. [2019-10-01 23:26:14,366 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-10-01 23:26:14,366 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 43 [2019-10-01 23:26:14,366 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-01 23:26:14,367 INFO L225 Difference]: With dead ends: 81 [2019-10-01 23:26:14,368 INFO L226 Difference]: Without dead ends: 54 [2019-10-01 23:26:14,368 INFO L640 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2019-10-01 23:26:14,369 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2019-10-01 23:26:14,373 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 52. [2019-10-01 23:26:14,374 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2019-10-01 23:26:14,375 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 54 transitions. [2019-10-01 23:26:14,375 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 54 transitions. Word has length 43 [2019-10-01 23:26:14,375 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-01 23:26:14,375 INFO L475 AbstractCegarLoop]: Abstraction has 52 states and 54 transitions. [2019-10-01 23:26:14,376 INFO L476 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-10-01 23:26:14,376 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 54 transitions. [2019-10-01 23:26:14,377 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2019-10-01 23:26:14,377 INFO L403 BasicCegarLoop]: Found error trace [2019-10-01 23:26:14,377 INFO L411 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-01 23:26:14,377 INFO L418 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-01 23:26:14,377 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-01 23:26:14,378 INFO L82 PathProgramCache]: Analyzing trace with hash 2059988486, now seen corresponding path program 8 times [2019-10-01 23:26:14,378 INFO L224 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-10-01 23:26:14,378 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-10-01 23:26:14,379 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-01 23:26:14,380 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-01 23:26:14,380 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-01 23:26:14,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-01 23:26:14,516 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2019-10-01 23:26:14,516 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-10-01 23:26:14,516 INFO L224 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 [2019-10-01 23:26:14,549 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2019-10-01 23:26:14,578 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-01 23:26:14,579 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-01 23:26:14,580 INFO L256 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 10 conjunts are in the unsatisfiable core [2019-10-01 23:26:14,583 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-01 23:26:14,602 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [MP z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (9)] Exception during sending of exit command (exit): Broken pipe [2019-10-01 23:26:14,606 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-01 23:26:14,606 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2019-10-01 23:26:14,607 INFO L454 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-10-01 23:26:14,608 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-10-01 23:26:14,609 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2019-10-01 23:26:14,609 INFO L87 Difference]: Start difference. First operand 52 states and 54 transitions. Second operand 12 states. [2019-10-01 23:26:14,725 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-01 23:26:14,725 INFO L93 Difference]: Finished difference Result 87 states and 92 transitions. [2019-10-01 23:26:14,727 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-10-01 23:26:14,727 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 47 [2019-10-01 23:26:14,727 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-01 23:26:14,728 INFO L225 Difference]: With dead ends: 87 [2019-10-01 23:26:14,728 INFO L226 Difference]: Without dead ends: 58 [2019-10-01 23:26:14,729 INFO L640 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2019-10-01 23:26:14,729 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2019-10-01 23:26:14,741 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 56. [2019-10-01 23:26:14,741 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2019-10-01 23:26:14,742 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 58 transitions. [2019-10-01 23:26:14,742 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 58 transitions. Word has length 47 [2019-10-01 23:26:14,742 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-01 23:26:14,742 INFO L475 AbstractCegarLoop]: Abstraction has 56 states and 58 transitions. [2019-10-01 23:26:14,743 INFO L476 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-10-01 23:26:14,743 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 58 transitions. [2019-10-01 23:26:14,744 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2019-10-01 23:26:14,744 INFO L403 BasicCegarLoop]: Found error trace [2019-10-01 23:26:14,744 INFO L411 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-01 23:26:14,744 INFO L418 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-01 23:26:14,744 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-01 23:26:14,745 INFO L82 PathProgramCache]: Analyzing trace with hash -1909355902, now seen corresponding path program 9 times [2019-10-01 23:26:14,745 INFO L224 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-10-01 23:26:14,745 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-10-01 23:26:14,746 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-01 23:26:14,747 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-10-01 23:26:14,747 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-01 23:26:14,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-01 23:26:14,883 INFO L134 CoverageAnalysis]: Checked inductivity of 162 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2019-10-01 23:26:14,884 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-10-01 23:26:14,884 INFO L224 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-10-01 23:26:14,905 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-10-01 23:26:15,340 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2019-10-01 23:26:15,340 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-01 23:26:15,342 INFO L256 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 11 conjunts are in the unsatisfiable core [2019-10-01 23:26:15,345 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-01 23:26:15,367 INFO L134 CoverageAnalysis]: Checked inductivity of 162 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2019-10-01 23:26:15,379 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-01 23:26:15,379 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 13 [2019-10-01 23:26:15,380 INFO L454 AbstractCegarLoop]: Interpolant automaton has 13 states [2019-10-01 23:26:15,380 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2019-10-01 23:26:15,380 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2019-10-01 23:26:15,381 INFO L87 Difference]: Start difference. First operand 56 states and 58 transitions. Second operand 13 states. [2019-10-01 23:26:15,495 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-01 23:26:15,495 INFO L93 Difference]: Finished difference Result 93 states and 98 transitions. [2019-10-01 23:26:15,495 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-10-01 23:26:15,496 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 51 [2019-10-01 23:26:15,496 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-01 23:26:15,497 INFO L225 Difference]: With dead ends: 93 [2019-10-01 23:26:15,497 INFO L226 Difference]: Without dead ends: 62 [2019-10-01 23:26:15,498 INFO L640 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2019-10-01 23:26:15,498 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2019-10-01 23:26:15,503 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 60. [2019-10-01 23:26:15,503 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2019-10-01 23:26:15,504 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 62 transitions. [2019-10-01 23:26:15,505 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 62 transitions. Word has length 51 [2019-10-01 23:26:15,505 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-01 23:26:15,505 INFO L475 AbstractCegarLoop]: Abstraction has 60 states and 62 transitions. [2019-10-01 23:26:15,505 INFO L476 AbstractCegarLoop]: Interpolant automaton has 13 states. [2019-10-01 23:26:15,505 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 62 transitions. [2019-10-01 23:26:15,506 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2019-10-01 23:26:15,506 INFO L403 BasicCegarLoop]: Found error trace [2019-10-01 23:26:15,506 INFO L411 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-01 23:26:15,507 INFO L418 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-01 23:26:15,507 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-01 23:26:15,507 INFO L82 PathProgramCache]: Analyzing trace with hash -1930921730, now seen corresponding path program 10 times [2019-10-01 23:26:15,507 INFO L224 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-10-01 23:26:15,507 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-10-01 23:26:15,508 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-01 23:26:15,509 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-10-01 23:26:15,509 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-01 23:26:15,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-01 23:26:15,652 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2019-10-01 23:26:15,652 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-10-01 23:26:15,652 INFO L224 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 [2019-10-01 23:26:15,672 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-10-01 23:26:15,715 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-01 23:26:15,715 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-01 23:26:15,716 INFO L256 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 12 conjunts are in the unsatisfiable core [2019-10-01 23:26:15,719 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-01 23:26:15,748 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [MP z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (11)] Exception during sending of exit command (exit): Broken pipe [2019-10-01 23:26:15,753 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-01 23:26:15,757 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 14 [2019-10-01 23:26:15,758 INFO L454 AbstractCegarLoop]: Interpolant automaton has 14 states [2019-10-01 23:26:15,759 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2019-10-01 23:26:15,759 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=91, Unknown=0, NotChecked=0, Total=182 [2019-10-01 23:26:15,760 INFO L87 Difference]: Start difference. First operand 60 states and 62 transitions. Second operand 14 states. [2019-10-01 23:26:15,879 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-01 23:26:15,879 INFO L93 Difference]: Finished difference Result 99 states and 104 transitions. [2019-10-01 23:26:15,881 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2019-10-01 23:26:15,881 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 55 [2019-10-01 23:26:15,881 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-01 23:26:15,882 INFO L225 Difference]: With dead ends: 99 [2019-10-01 23:26:15,882 INFO L226 Difference]: Without dead ends: 66 [2019-10-01 23:26:15,883 INFO L640 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 55 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=91, Invalid=91, Unknown=0, NotChecked=0, Total=182 [2019-10-01 23:26:15,883 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2019-10-01 23:26:15,887 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 64. [2019-10-01 23:26:15,888 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2019-10-01 23:26:15,889 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 66 transitions. [2019-10-01 23:26:15,889 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 66 transitions. Word has length 55 [2019-10-01 23:26:15,889 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-01 23:26:15,889 INFO L475 AbstractCegarLoop]: Abstraction has 64 states and 66 transitions. [2019-10-01 23:26:15,889 INFO L476 AbstractCegarLoop]: Interpolant automaton has 14 states. [2019-10-01 23:26:15,889 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 66 transitions. [2019-10-01 23:26:15,890 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2019-10-01 23:26:15,890 INFO L403 BasicCegarLoop]: Found error trace [2019-10-01 23:26:15,891 INFO L411 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-01 23:26:15,891 INFO L418 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-01 23:26:15,891 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-01 23:26:15,891 INFO L82 PathProgramCache]: Analyzing trace with hash -1124550278, now seen corresponding path program 11 times [2019-10-01 23:26:15,891 INFO L224 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-10-01 23:26:15,892 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-10-01 23:26:15,893 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-01 23:26:15,893 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-10-01 23:26:15,893 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-01 23:26:15,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-01 23:26:16,043 INFO L134 CoverageAnalysis]: Checked inductivity of 242 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2019-10-01 23:26:16,044 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-10-01 23:26:16,044 INFO L224 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 [2019-10-01 23:26:16,065 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2019-10-01 23:26:17,174 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2019-10-01 23:26:17,175 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-01 23:26:17,180 INFO L256 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 13 conjunts are in the unsatisfiable core [2019-10-01 23:26:17,182 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-01 23:26:17,202 INFO L134 CoverageAnalysis]: Checked inductivity of 242 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2019-10-01 23:26:17,208 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-01 23:26:17,209 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 15 [2019-10-01 23:26:17,209 INFO L454 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-10-01 23:26:17,209 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-10-01 23:26:17,210 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2019-10-01 23:26:17,210 INFO L87 Difference]: Start difference. First operand 64 states and 66 transitions. Second operand 15 states. [2019-10-01 23:26:17,327 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-01 23:26:17,327 INFO L93 Difference]: Finished difference Result 105 states and 110 transitions. [2019-10-01 23:26:17,327 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-10-01 23:26:17,328 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 59 [2019-10-01 23:26:17,328 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-01 23:26:17,329 INFO L225 Difference]: With dead ends: 105 [2019-10-01 23:26:17,329 INFO L226 Difference]: Without dead ends: 70 [2019-10-01 23:26:17,329 INFO L640 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 59 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2019-10-01 23:26:17,330 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2019-10-01 23:26:17,334 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 68. [2019-10-01 23:26:17,334 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2019-10-01 23:26:17,335 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 70 transitions. [2019-10-01 23:26:17,335 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 70 transitions. Word has length 59 [2019-10-01 23:26:17,336 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-01 23:26:17,336 INFO L475 AbstractCegarLoop]: Abstraction has 68 states and 70 transitions. [2019-10-01 23:26:17,336 INFO L476 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-10-01 23:26:17,336 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 70 transitions. [2019-10-01 23:26:17,337 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2019-10-01 23:26:17,337 INFO L403 BasicCegarLoop]: Found error trace [2019-10-01 23:26:17,337 INFO L411 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-01 23:26:17,338 INFO L418 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-01 23:26:17,338 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-01 23:26:17,338 INFO L82 PathProgramCache]: Analyzing trace with hash 367873014, now seen corresponding path program 12 times [2019-10-01 23:26:17,338 INFO L224 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-10-01 23:26:17,338 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-10-01 23:26:17,339 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-01 23:26:17,340 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-10-01 23:26:17,340 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-01 23:26:17,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-01 23:26:17,483 INFO L134 CoverageAnalysis]: Checked inductivity of 288 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2019-10-01 23:26:17,483 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-10-01 23:26:17,484 INFO L224 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 [2019-10-01 23:26:17,514 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2019-10-01 23:26:19,601 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2019-10-01 23:26:19,601 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-01 23:26:19,606 INFO L256 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 14 conjunts are in the unsatisfiable core [2019-10-01 23:26:19,608 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-01 23:26:19,630 INFO L134 CoverageAnalysis]: Checked inductivity of 288 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2019-10-01 23:26:19,636 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-01 23:26:19,637 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 16 [2019-10-01 23:26:19,637 INFO L454 AbstractCegarLoop]: Interpolant automaton has 16 states [2019-10-01 23:26:19,637 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2019-10-01 23:26:19,638 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=120, Unknown=0, NotChecked=0, Total=240 [2019-10-01 23:26:19,638 INFO L87 Difference]: Start difference. First operand 68 states and 70 transitions. Second operand 16 states. [2019-10-01 23:26:19,764 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-01 23:26:19,764 INFO L93 Difference]: Finished difference Result 111 states and 116 transitions. [2019-10-01 23:26:19,765 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2019-10-01 23:26:19,765 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 63 [2019-10-01 23:26:19,766 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-01 23:26:19,766 INFO L225 Difference]: With dead ends: 111 [2019-10-01 23:26:19,766 INFO L226 Difference]: Without dead ends: 74 [2019-10-01 23:26:19,767 INFO L640 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 63 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=120, Invalid=120, Unknown=0, NotChecked=0, Total=240 [2019-10-01 23:26:19,768 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2019-10-01 23:26:19,772 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 72. [2019-10-01 23:26:19,772 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2019-10-01 23:26:19,773 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 74 transitions. [2019-10-01 23:26:19,773 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 74 transitions. Word has length 63 [2019-10-01 23:26:19,774 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-01 23:26:19,774 INFO L475 AbstractCegarLoop]: Abstraction has 72 states and 74 transitions. [2019-10-01 23:26:19,774 INFO L476 AbstractCegarLoop]: Interpolant automaton has 16 states. [2019-10-01 23:26:19,774 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 74 transitions. [2019-10-01 23:26:19,775 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2019-10-01 23:26:19,775 INFO L403 BasicCegarLoop]: Found error trace [2019-10-01 23:26:19,775 INFO L411 BasicCegarLoop]: trace histogram [13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-01 23:26:19,776 INFO L418 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-01 23:26:19,776 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-01 23:26:19,776 INFO L82 PathProgramCache]: Analyzing trace with hash -1060032398, now seen corresponding path program 13 times [2019-10-01 23:26:19,776 INFO L224 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-10-01 23:26:19,776 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-10-01 23:26:19,777 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-01 23:26:19,777 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-10-01 23:26:19,778 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-01 23:26:19,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-01 23:26:19,954 INFO L134 CoverageAnalysis]: Checked inductivity of 338 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 169 trivial. 0 not checked. [2019-10-01 23:26:19,954 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-10-01 23:26:19,954 INFO L224 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 [2019-10-01 23:26:19,981 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-01 23:26:20,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-01 23:26:20,015 INFO L256 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 15 conjunts are in the unsatisfiable core [2019-10-01 23:26:20,017 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-01 23:26:20,046 INFO L134 CoverageAnalysis]: Checked inductivity of 338 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 169 trivial. 0 not checked. [2019-10-01 23:26:20,053 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-01 23:26:20,054 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 17 [2019-10-01 23:26:20,054 INFO L454 AbstractCegarLoop]: Interpolant automaton has 17 states [2019-10-01 23:26:20,055 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2019-10-01 23:26:20,055 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2019-10-01 23:26:20,055 INFO L87 Difference]: Start difference. First operand 72 states and 74 transitions. Second operand 17 states. [2019-10-01 23:26:20,162 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-01 23:26:20,162 INFO L93 Difference]: Finished difference Result 117 states and 122 transitions. [2019-10-01 23:26:20,164 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2019-10-01 23:26:20,164 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 67 [2019-10-01 23:26:20,164 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-01 23:26:20,165 INFO L225 Difference]: With dead ends: 117 [2019-10-01 23:26:20,165 INFO L226 Difference]: Without dead ends: 78 [2019-10-01 23:26:20,166 INFO L640 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 67 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2019-10-01 23:26:20,166 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2019-10-01 23:26:20,170 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 76. [2019-10-01 23:26:20,170 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2019-10-01 23:26:20,171 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 78 transitions. [2019-10-01 23:26:20,171 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 78 transitions. Word has length 67 [2019-10-01 23:26:20,171 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-01 23:26:20,171 INFO L475 AbstractCegarLoop]: Abstraction has 76 states and 78 transitions. [2019-10-01 23:26:20,171 INFO L476 AbstractCegarLoop]: Interpolant automaton has 17 states. [2019-10-01 23:26:20,172 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 78 transitions. [2019-10-01 23:26:20,172 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2019-10-01 23:26:20,173 INFO L403 BasicCegarLoop]: Found error trace [2019-10-01 23:26:20,173 INFO L411 BasicCegarLoop]: trace histogram [14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-01 23:26:20,173 INFO L418 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-01 23:26:20,173 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-01 23:26:20,173 INFO L82 PathProgramCache]: Analyzing trace with hash -1741723922, now seen corresponding path program 14 times [2019-10-01 23:26:20,174 INFO L224 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-10-01 23:26:20,174 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-10-01 23:26:20,175 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-01 23:26:20,175 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-01 23:26:20,175 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-01 23:26:20,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-01 23:26:20,364 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2019-10-01 23:26:20,365 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-10-01 23:26:20,365 INFO L224 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 [2019-10-01 23:26:20,399 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2019-10-01 23:26:20,434 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-01 23:26:20,435 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-01 23:26:20,436 INFO L256 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 16 conjunts are in the unsatisfiable core [2019-10-01 23:26:20,438 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-01 23:26:20,469 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2019-10-01 23:26:20,481 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-01 23:26:20,481 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 18 [2019-10-01 23:26:20,481 INFO L454 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-10-01 23:26:20,482 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-10-01 23:26:20,482 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2019-10-01 23:26:20,482 INFO L87 Difference]: Start difference. First operand 76 states and 78 transitions. Second operand 18 states. [2019-10-01 23:26:20,615 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-01 23:26:20,616 INFO L93 Difference]: Finished difference Result 123 states and 128 transitions. [2019-10-01 23:26:20,616 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-10-01 23:26:20,616 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 71 [2019-10-01 23:26:20,617 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-01 23:26:20,617 INFO L225 Difference]: With dead ends: 123 [2019-10-01 23:26:20,617 INFO L226 Difference]: Without dead ends: 82 [2019-10-01 23:26:20,618 INFO L640 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 71 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2019-10-01 23:26:20,618 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2019-10-01 23:26:20,622 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 80. [2019-10-01 23:26:20,622 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2019-10-01 23:26:20,623 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 82 transitions. [2019-10-01 23:26:20,623 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 82 transitions. Word has length 71 [2019-10-01 23:26:20,623 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-01 23:26:20,623 INFO L475 AbstractCegarLoop]: Abstraction has 80 states and 82 transitions. [2019-10-01 23:26:20,623 INFO L476 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-10-01 23:26:20,623 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 82 transitions. [2019-10-01 23:26:20,624 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2019-10-01 23:26:20,625 INFO L403 BasicCegarLoop]: Found error trace [2019-10-01 23:26:20,625 INFO L411 BasicCegarLoop]: trace histogram [15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-01 23:26:20,625 INFO L418 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-01 23:26:20,625 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-01 23:26:20,625 INFO L82 PathProgramCache]: Analyzing trace with hash -1475154070, now seen corresponding path program 15 times [2019-10-01 23:26:20,626 INFO L224 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-10-01 23:26:20,626 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-10-01 23:26:20,627 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-01 23:26:20,627 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-10-01 23:26:20,627 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-01 23:26:20,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-01 23:26:20,836 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 225 trivial. 0 not checked. [2019-10-01 23:26:20,837 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-10-01 23:26:20,837 INFO L224 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) [2019-10-01 23:26:20,873 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-10-01 23:26:26,195 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2019-10-01 23:26:26,195 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-01 23:26:26,200 INFO L256 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 19 conjunts are in the unsatisfiable core [2019-10-01 23:26:26,202 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-01 23:26:26,232 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 225 trivial. 0 not checked. [2019-10-01 23:26:26,239 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-01 23:26:26,239 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 19 [2019-10-01 23:26:26,239 INFO L454 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-10-01 23:26:26,240 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-10-01 23:26:26,240 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2019-10-01 23:26:26,240 INFO L87 Difference]: Start difference. First operand 80 states and 82 transitions. Second operand 19 states. [2019-10-01 23:26:26,387 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-01 23:26:26,387 INFO L93 Difference]: Finished difference Result 129 states and 134 transitions. [2019-10-01 23:26:26,388 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-10-01 23:26:26,388 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 75 [2019-10-01 23:26:26,389 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-01 23:26:26,390 INFO L225 Difference]: With dead ends: 129 [2019-10-01 23:26:26,390 INFO L226 Difference]: Without dead ends: 86 [2019-10-01 23:26:26,391 INFO L640 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2019-10-01 23:26:26,391 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2019-10-01 23:26:26,395 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 84. [2019-10-01 23:26:26,395 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2019-10-01 23:26:26,396 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 86 transitions. [2019-10-01 23:26:26,397 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 86 transitions. Word has length 75 [2019-10-01 23:26:26,397 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-01 23:26:26,397 INFO L475 AbstractCegarLoop]: Abstraction has 84 states and 86 transitions. [2019-10-01 23:26:26,397 INFO L476 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-10-01 23:26:26,397 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 86 transitions. [2019-10-01 23:26:26,399 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2019-10-01 23:26:26,399 INFO L403 BasicCegarLoop]: Found error trace [2019-10-01 23:26:26,399 INFO L411 BasicCegarLoop]: trace histogram [16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-01 23:26:26,399 INFO L418 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-01 23:26:26,400 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-01 23:26:26,400 INFO L82 PathProgramCache]: Analyzing trace with hash -1375286810, now seen corresponding path program 16 times [2019-10-01 23:26:26,400 INFO L224 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-10-01 23:26:26,400 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-10-01 23:26:26,402 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-01 23:26:26,403 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-10-01 23:26:26,403 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-01 23:26:26,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-01 23:26:26,645 INFO L134 CoverageAnalysis]: Checked inductivity of 512 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 256 trivial. 0 not checked. [2019-10-01 23:26:26,645 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-10-01 23:26:26,645 INFO L224 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 [2019-10-01 23:26:26,666 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-10-01 23:26:26,707 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-01 23:26:26,707 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-01 23:26:26,710 INFO L256 TraceCheckSpWp]: Trace formula consists of 217 conjuncts, 18 conjunts are in the unsatisfiable core [2019-10-01 23:26:26,711 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-01 23:26:26,729 INFO L134 CoverageAnalysis]: Checked inductivity of 512 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 256 trivial. 0 not checked. [2019-10-01 23:26:26,733 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-01 23:26:26,734 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 20 [2019-10-01 23:26:26,735 INFO L454 AbstractCegarLoop]: Interpolant automaton has 20 states [2019-10-01 23:26:26,735 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2019-10-01 23:26:26,736 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2019-10-01 23:26:26,736 INFO L87 Difference]: Start difference. First operand 84 states and 86 transitions. Second operand 20 states. [2019-10-01 23:26:26,881 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-01 23:26:26,882 INFO L93 Difference]: Finished difference Result 135 states and 140 transitions. [2019-10-01 23:26:26,882 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2019-10-01 23:26:26,882 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 79 [2019-10-01 23:26:26,883 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-01 23:26:26,883 INFO L225 Difference]: With dead ends: 135 [2019-10-01 23:26:26,883 INFO L226 Difference]: Without dead ends: 90 [2019-10-01 23:26:26,885 INFO L640 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 79 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2019-10-01 23:26:26,886 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2019-10-01 23:26:26,890 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 88. [2019-10-01 23:26:26,891 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2019-10-01 23:26:26,891 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 90 transitions. [2019-10-01 23:26:26,892 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 90 transitions. Word has length 79 [2019-10-01 23:26:26,892 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-01 23:26:26,892 INFO L475 AbstractCegarLoop]: Abstraction has 88 states and 90 transitions. [2019-10-01 23:26:26,892 INFO L476 AbstractCegarLoop]: Interpolant automaton has 20 states. [2019-10-01 23:26:26,892 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 90 transitions. [2019-10-01 23:26:26,893 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2019-10-01 23:26:26,893 INFO L403 BasicCegarLoop]: Found error trace [2019-10-01 23:26:26,893 INFO L411 BasicCegarLoop]: trace histogram [17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-01 23:26:26,894 INFO L418 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-01 23:26:26,894 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-01 23:26:26,894 INFO L82 PathProgramCache]: Analyzing trace with hash -1726613918, now seen corresponding path program 17 times [2019-10-01 23:26:26,894 INFO L224 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-10-01 23:26:26,894 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-10-01 23:26:26,897 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-01 23:26:26,897 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-10-01 23:26:26,897 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-01 23:26:26,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-01 23:26:27,130 INFO L134 CoverageAnalysis]: Checked inductivity of 578 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 289 trivial. 0 not checked. [2019-10-01 23:26:27,131 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-10-01 23:26:27,131 INFO L224 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-10-01 23:26:27,164 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2019-10-01 23:26:32,084 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2019-10-01 23:26:32,085 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-01 23:26:32,101 INFO L256 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 19 conjunts are in the unsatisfiable core [2019-10-01 23:26:32,103 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-01 23:26:32,127 INFO L134 CoverageAnalysis]: Checked inductivity of 578 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 289 trivial. 0 not checked. [2019-10-01 23:26:32,137 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-01 23:26:32,137 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 21 [2019-10-01 23:26:32,138 INFO L454 AbstractCegarLoop]: Interpolant automaton has 21 states [2019-10-01 23:26:32,139 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2019-10-01 23:26:32,139 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2019-10-01 23:26:32,139 INFO L87 Difference]: Start difference. First operand 88 states and 90 transitions. Second operand 21 states. [2019-10-01 23:26:32,320 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-01 23:26:32,321 INFO L93 Difference]: Finished difference Result 141 states and 146 transitions. [2019-10-01 23:26:32,321 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2019-10-01 23:26:32,321 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 83 [2019-10-01 23:26:32,321 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-01 23:26:32,322 INFO L225 Difference]: With dead ends: 141 [2019-10-01 23:26:32,322 INFO L226 Difference]: Without dead ends: 94 [2019-10-01 23:26:32,323 INFO L640 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 83 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2019-10-01 23:26:32,323 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2019-10-01 23:26:32,326 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 92. [2019-10-01 23:26:32,326 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2019-10-01 23:26:32,327 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 94 transitions. [2019-10-01 23:26:32,327 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 94 transitions. Word has length 83 [2019-10-01 23:26:32,327 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-01 23:26:32,328 INFO L475 AbstractCegarLoop]: Abstraction has 92 states and 94 transitions. [2019-10-01 23:26:32,328 INFO L476 AbstractCegarLoop]: Interpolant automaton has 21 states. [2019-10-01 23:26:32,328 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 94 transitions. [2019-10-01 23:26:32,328 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2019-10-01 23:26:32,329 INFO L403 BasicCegarLoop]: Found error trace [2019-10-01 23:26:32,329 INFO L411 BasicCegarLoop]: trace histogram [18, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-01 23:26:32,329 INFO L418 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-01 23:26:32,329 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-01 23:26:32,329 INFO L82 PathProgramCache]: Analyzing trace with hash 164328670, now seen corresponding path program 18 times [2019-10-01 23:26:32,330 INFO L224 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-10-01 23:26:32,330 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-10-01 23:26:32,331 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-01 23:26:32,331 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-10-01 23:26:32,331 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-01 23:26:32,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-01 23:26:32,578 INFO L134 CoverageAnalysis]: Checked inductivity of 648 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 324 trivial. 0 not checked. [2019-10-01 23:26:32,579 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-10-01 23:26:32,579 INFO L224 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 [2019-10-01 23:26:32,600 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2019-10-01 23:27:07,639 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2019-10-01 23:27:07,639 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-01 23:27:07,659 INFO L256 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 22 conjunts are in the unsatisfiable core [2019-10-01 23:27:07,661 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-01 23:27:07,684 INFO L134 CoverageAnalysis]: Checked inductivity of 648 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 324 trivial. 0 not checked. [MP z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (19)] Exception during sending of exit command (exit): Broken pipe [2019-10-01 23:27:07,697 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-01 23:27:07,698 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21] total 22 [2019-10-01 23:27:07,698 INFO L454 AbstractCegarLoop]: Interpolant automaton has 22 states [2019-10-01 23:27:07,698 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2019-10-01 23:27:07,699 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=231, Invalid=231, Unknown=0, NotChecked=0, Total=462 [2019-10-01 23:27:07,699 INFO L87 Difference]: Start difference. First operand 92 states and 94 transitions. Second operand 22 states. [2019-10-01 23:27:07,856 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-01 23:27:07,857 INFO L93 Difference]: Finished difference Result 147 states and 152 transitions. [2019-10-01 23:27:07,857 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2019-10-01 23:27:07,858 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 87 [2019-10-01 23:27:07,858 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-01 23:27:07,858 INFO L225 Difference]: With dead ends: 147 [2019-10-01 23:27:07,859 INFO L226 Difference]: Without dead ends: 98 [2019-10-01 23:27:07,859 INFO L640 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 87 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=231, Invalid=231, Unknown=0, NotChecked=0, Total=462 [2019-10-01 23:27:07,860 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2019-10-01 23:27:07,862 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 96. [2019-10-01 23:27:07,863 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 96 states. [2019-10-01 23:27:07,863 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 98 transitions. [2019-10-01 23:27:07,863 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 98 transitions. Word has length 87 [2019-10-01 23:27:07,864 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-01 23:27:07,864 INFO L475 AbstractCegarLoop]: Abstraction has 96 states and 98 transitions. [2019-10-01 23:27:07,865 INFO L476 AbstractCegarLoop]: Interpolant automaton has 22 states. [2019-10-01 23:27:07,865 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 98 transitions. [2019-10-01 23:27:07,865 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2019-10-01 23:27:07,866 INFO L403 BasicCegarLoop]: Found error trace [2019-10-01 23:27:07,866 INFO L411 BasicCegarLoop]: trace histogram [19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-01 23:27:07,866 INFO L418 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-01 23:27:07,866 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-01 23:27:07,866 INFO L82 PathProgramCache]: Analyzing trace with hash -768457382, now seen corresponding path program 19 times [2019-10-01 23:27:07,867 INFO L224 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-10-01 23:27:07,867 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-10-01 23:27:07,868 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-01 23:27:07,868 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-10-01 23:27:07,868 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-01 23:27:07,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-01 23:27:08,134 INFO L134 CoverageAnalysis]: Checked inductivity of 722 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 361 trivial. 0 not checked. [2019-10-01 23:27:08,134 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-10-01 23:27:08,134 INFO L224 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 [2019-10-01 23:27:08,177 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-01 23:27:08,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-01 23:27:08,229 INFO L256 TraceCheckSpWp]: Trace formula consists of 247 conjuncts, 21 conjunts are in the unsatisfiable core [2019-10-01 23:27:08,232 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-01 23:27:08,261 INFO L134 CoverageAnalysis]: Checked inductivity of 722 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 361 trivial. 0 not checked. [2019-10-01 23:27:08,266 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-01 23:27:08,266 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 23 [2019-10-01 23:27:08,267 INFO L454 AbstractCegarLoop]: Interpolant automaton has 23 states [2019-10-01 23:27:08,268 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2019-10-01 23:27:08,268 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=253, Unknown=0, NotChecked=0, Total=506 [2019-10-01 23:27:08,268 INFO L87 Difference]: Start difference. First operand 96 states and 98 transitions. Second operand 23 states. [2019-10-01 23:27:08,420 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-01 23:27:08,420 INFO L93 Difference]: Finished difference Result 153 states and 158 transitions. [2019-10-01 23:27:08,422 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2019-10-01 23:27:08,422 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 91 [2019-10-01 23:27:08,422 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-01 23:27:08,423 INFO L225 Difference]: With dead ends: 153 [2019-10-01 23:27:08,423 INFO L226 Difference]: Without dead ends: 102 [2019-10-01 23:27:08,424 INFO L640 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 91 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=253, Invalid=253, Unknown=0, NotChecked=0, Total=506 [2019-10-01 23:27:08,424 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2019-10-01 23:27:08,427 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 100. [2019-10-01 23:27:08,428 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 100 states. [2019-10-01 23:27:08,428 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 102 transitions. [2019-10-01 23:27:08,428 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 102 transitions. Word has length 91 [2019-10-01 23:27:08,429 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-01 23:27:08,429 INFO L475 AbstractCegarLoop]: Abstraction has 100 states and 102 transitions. [2019-10-01 23:27:08,429 INFO L476 AbstractCegarLoop]: Interpolant automaton has 23 states. [2019-10-01 23:27:08,429 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 102 transitions. [2019-10-01 23:27:08,430 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2019-10-01 23:27:08,430 INFO L403 BasicCegarLoop]: Found error trace [2019-10-01 23:27:08,430 INFO L411 BasicCegarLoop]: trace histogram [20, 20, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-01 23:27:08,430 INFO L418 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-01 23:27:08,430 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-01 23:27:08,431 INFO L82 PathProgramCache]: Analyzing trace with hash 1976920022, now seen corresponding path program 20 times [2019-10-01 23:27:08,431 INFO L224 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-10-01 23:27:08,431 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-10-01 23:27:08,433 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-01 23:27:08,434 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-01 23:27:08,434 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-01 23:27:08,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-01 23:27:08,707 INFO L134 CoverageAnalysis]: Checked inductivity of 800 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 400 trivial. 0 not checked. [2019-10-01 23:27:08,707 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-10-01 23:27:08,707 INFO L224 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-10-01 23:27:08,736 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2019-10-01 23:27:08,787 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-01 23:27:08,787 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-01 23:27:08,788 INFO L256 TraceCheckSpWp]: Trace formula consists of 257 conjuncts, 22 conjunts are in the unsatisfiable core [2019-10-01 23:27:08,790 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-01 23:27:08,835 INFO L134 CoverageAnalysis]: Checked inductivity of 800 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 400 trivial. 0 not checked. [MP z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (21)] Exception during sending of exit command (exit): Broken pipe [2019-10-01 23:27:08,839 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-01 23:27:08,839 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23] total 24 [2019-10-01 23:27:08,840 INFO L454 AbstractCegarLoop]: Interpolant automaton has 24 states [2019-10-01 23:27:08,840 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2019-10-01 23:27:08,841 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2019-10-01 23:27:08,841 INFO L87 Difference]: Start difference. First operand 100 states and 102 transitions. Second operand 24 states. [2019-10-01 23:27:09,004 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-01 23:27:09,004 INFO L93 Difference]: Finished difference Result 159 states and 164 transitions. [2019-10-01 23:27:09,007 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2019-10-01 23:27:09,007 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 95 [2019-10-01 23:27:09,008 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-01 23:27:09,008 INFO L225 Difference]: With dead ends: 159 [2019-10-01 23:27:09,008 INFO L226 Difference]: Without dead ends: 106 [2019-10-01 23:27:09,009 INFO L640 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 95 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2019-10-01 23:27:09,009 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2019-10-01 23:27:09,012 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 104. [2019-10-01 23:27:09,013 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 104 states. [2019-10-01 23:27:09,013 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 106 transitions. [2019-10-01 23:27:09,013 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 106 transitions. Word has length 95 [2019-10-01 23:27:09,014 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-01 23:27:09,014 INFO L475 AbstractCegarLoop]: Abstraction has 104 states and 106 transitions. [2019-10-01 23:27:09,014 INFO L476 AbstractCegarLoop]: Interpolant automaton has 24 states. [2019-10-01 23:27:09,014 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 106 transitions. [2019-10-01 23:27:09,015 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2019-10-01 23:27:09,015 INFO L403 BasicCegarLoop]: Found error trace [2019-10-01 23:27:09,015 INFO L411 BasicCegarLoop]: trace histogram [21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-01 23:27:09,015 INFO L418 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-01 23:27:09,016 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-01 23:27:09,016 INFO L82 PathProgramCache]: Analyzing trace with hash -1447044014, now seen corresponding path program 21 times [2019-10-01 23:27:09,016 INFO L224 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-10-01 23:27:09,016 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-10-01 23:27:09,017 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-01 23:27:09,017 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-10-01 23:27:09,017 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-01 23:27:09,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-01 23:27:09,310 INFO L134 CoverageAnalysis]: Checked inductivity of 882 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 441 trivial. 0 not checked. [2019-10-01 23:27:09,310 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-10-01 23:27:09,310 INFO L224 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 [2019-10-01 23:27:09,333 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-10-01 23:27:44,290 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2019-10-01 23:27:44,290 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-01 23:27:44,305 INFO L256 TraceCheckSpWp]: Trace formula consists of 267 conjuncts, 23 conjunts are in the unsatisfiable core [2019-10-01 23:27:44,306 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-01 23:27:44,323 INFO L134 CoverageAnalysis]: Checked inductivity of 882 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 441 trivial. 0 not checked. [2019-10-01 23:27:44,335 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-01 23:27:44,335 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24] total 25 [2019-10-01 23:27:44,335 INFO L454 AbstractCegarLoop]: Interpolant automaton has 25 states [2019-10-01 23:27:44,335 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2019-10-01 23:27:44,336 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=300, Invalid=300, Unknown=0, NotChecked=0, Total=600 [2019-10-01 23:27:44,336 INFO L87 Difference]: Start difference. First operand 104 states and 106 transitions. Second operand 25 states. [2019-10-01 23:27:44,489 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-01 23:27:44,490 INFO L93 Difference]: Finished difference Result 165 states and 170 transitions. [2019-10-01 23:27:44,490 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2019-10-01 23:27:44,490 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 99 [2019-10-01 23:27:44,490 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-01 23:27:44,491 INFO L225 Difference]: With dead ends: 165 [2019-10-01 23:27:44,491 INFO L226 Difference]: Without dead ends: 110 [2019-10-01 23:27:44,492 INFO L640 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 99 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=300, Invalid=300, Unknown=0, NotChecked=0, Total=600 [2019-10-01 23:27:44,492 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2019-10-01 23:27:44,494 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 108. [2019-10-01 23:27:44,495 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 108 states. [2019-10-01 23:27:44,495 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 110 transitions. [2019-10-01 23:27:44,496 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 110 transitions. Word has length 99 [2019-10-01 23:27:44,496 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-01 23:27:44,496 INFO L475 AbstractCegarLoop]: Abstraction has 108 states and 110 transitions. [2019-10-01 23:27:44,496 INFO L476 AbstractCegarLoop]: Interpolant automaton has 25 states. [2019-10-01 23:27:44,496 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 110 transitions. [2019-10-01 23:27:44,497 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2019-10-01 23:27:44,497 INFO L403 BasicCegarLoop]: Found error trace [2019-10-01 23:27:44,497 INFO L411 BasicCegarLoop]: trace histogram [22, 22, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-01 23:27:44,498 INFO L418 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-01 23:27:44,498 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-01 23:27:44,498 INFO L82 PathProgramCache]: Analyzing trace with hash -730029362, now seen corresponding path program 22 times [2019-10-01 23:27:44,498 INFO L224 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-10-01 23:27:44,498 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-10-01 23:27:44,499 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-01 23:27:44,499 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-10-01 23:27:44,499 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-01 23:27:44,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-01 23:27:44,826 INFO L134 CoverageAnalysis]: Checked inductivity of 968 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 484 trivial. 0 not checked. [2019-10-01 23:27:44,827 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-10-01 23:27:44,827 INFO L224 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 [2019-10-01 23:27:44,866 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-10-01 23:27:44,915 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-01 23:27:44,915 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-01 23:27:44,916 INFO L256 TraceCheckSpWp]: Trace formula consists of 277 conjuncts, 24 conjunts are in the unsatisfiable core [2019-10-01 23:27:44,918 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-01 23:27:44,953 INFO L134 CoverageAnalysis]: Checked inductivity of 968 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 484 trivial. 0 not checked. [2019-10-01 23:27:44,957 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-01 23:27:44,957 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 26 [2019-10-01 23:27:44,958 INFO L454 AbstractCegarLoop]: Interpolant automaton has 26 states [2019-10-01 23:27:44,958 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2019-10-01 23:27:44,963 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=325, Invalid=325, Unknown=0, NotChecked=0, Total=650 [2019-10-01 23:27:44,964 INFO L87 Difference]: Start difference. First operand 108 states and 110 transitions. Second operand 26 states. [2019-10-01 23:27:45,129 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-01 23:27:45,129 INFO L93 Difference]: Finished difference Result 171 states and 176 transitions. [2019-10-01 23:27:45,130 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2019-10-01 23:27:45,130 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 103 [2019-10-01 23:27:45,130 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-01 23:27:45,131 INFO L225 Difference]: With dead ends: 171 [2019-10-01 23:27:45,131 INFO L226 Difference]: Without dead ends: 114 [2019-10-01 23:27:45,132 INFO L640 BasicCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 103 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=325, Invalid=325, Unknown=0, NotChecked=0, Total=650 [2019-10-01 23:27:45,132 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2019-10-01 23:27:45,135 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 112. [2019-10-01 23:27:45,136 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 112 states. [2019-10-01 23:27:45,136 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 114 transitions. [2019-10-01 23:27:45,137 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 114 transitions. Word has length 103 [2019-10-01 23:27:45,137 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-01 23:27:45,137 INFO L475 AbstractCegarLoop]: Abstraction has 112 states and 114 transitions. [2019-10-01 23:27:45,137 INFO L476 AbstractCegarLoop]: Interpolant automaton has 26 states. [2019-10-01 23:27:45,137 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 114 transitions. [2019-10-01 23:27:45,138 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2019-10-01 23:27:45,138 INFO L403 BasicCegarLoop]: Found error trace [2019-10-01 23:27:45,138 INFO L411 BasicCegarLoop]: trace histogram [23, 23, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-01 23:27:45,138 INFO L418 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-01 23:27:45,138 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-01 23:27:45,139 INFO L82 PathProgramCache]: Analyzing trace with hash -1911112886, now seen corresponding path program 23 times [2019-10-01 23:27:45,139 INFO L224 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-10-01 23:27:45,139 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-10-01 23:27:45,140 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-01 23:27:45,140 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-10-01 23:27:45,140 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-01 23:27:45,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-01 23:27:45,593 INFO L134 CoverageAnalysis]: Checked inductivity of 1058 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 529 trivial. 0 not checked. [2019-10-01 23:27:45,593 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-10-01 23:27:45,593 INFO L224 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 [2019-10-01 23:27:45,646 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2019-10-01 23:29:08,332 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 24 check-sat command(s) [2019-10-01 23:29:08,332 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-01 23:29:08,381 INFO L256 TraceCheckSpWp]: Trace formula consists of 287 conjuncts, 25 conjunts are in the unsatisfiable core [2019-10-01 23:29:08,383 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-01 23:29:08,408 INFO L134 CoverageAnalysis]: Checked inductivity of 1058 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 529 trivial. 0 not checked. [2019-10-01 23:29:08,432 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-01 23:29:08,432 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26] total 27 [2019-10-01 23:29:08,433 INFO L454 AbstractCegarLoop]: Interpolant automaton has 27 states [2019-10-01 23:29:08,433 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2019-10-01 23:29:08,433 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=351, Invalid=351, Unknown=0, NotChecked=0, Total=702 [2019-10-01 23:29:08,434 INFO L87 Difference]: Start difference. First operand 112 states and 114 transitions. Second operand 27 states. [2019-10-01 23:29:08,640 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-01 23:29:08,640 INFO L93 Difference]: Finished difference Result 177 states and 182 transitions. [2019-10-01 23:29:08,643 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2019-10-01 23:29:08,644 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 107 [2019-10-01 23:29:08,644 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-01 23:29:08,645 INFO L225 Difference]: With dead ends: 177 [2019-10-01 23:29:08,645 INFO L226 Difference]: Without dead ends: 118 [2019-10-01 23:29:08,645 INFO L640 BasicCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 107 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=351, Invalid=351, Unknown=0, NotChecked=0, Total=702 [2019-10-01 23:29:08,646 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2019-10-01 23:29:08,649 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 116. [2019-10-01 23:29:08,649 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 116 states. [2019-10-01 23:29:08,650 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 118 transitions. [2019-10-01 23:29:08,650 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 118 transitions. Word has length 107 [2019-10-01 23:29:08,650 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-01 23:29:08,650 INFO L475 AbstractCegarLoop]: Abstraction has 116 states and 118 transitions. [2019-10-01 23:29:08,650 INFO L476 AbstractCegarLoop]: Interpolant automaton has 27 states. [2019-10-01 23:29:08,650 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 118 transitions. [2019-10-01 23:29:08,651 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2019-10-01 23:29:08,651 INFO L403 BasicCegarLoop]: Found error trace [2019-10-01 23:29:08,651 INFO L411 BasicCegarLoop]: trace histogram [24, 24, 24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-01 23:29:08,652 INFO L418 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-01 23:29:08,652 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-01 23:29:08,652 INFO L82 PathProgramCache]: Analyzing trace with hash 538518982, now seen corresponding path program 24 times [2019-10-01 23:29:08,652 INFO L224 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-10-01 23:29:08,652 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-10-01 23:29:08,653 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-01 23:29:08,653 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-10-01 23:29:08,653 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-01 23:29:08,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-01 23:29:09,047 INFO L134 CoverageAnalysis]: Checked inductivity of 1152 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 576 trivial. 0 not checked. [2019-10-01 23:29:09,048 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-10-01 23:29:09,048 INFO L224 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-10-01 23:29:09,096 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2019-10-01 23:30:54,758 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 25 check-sat command(s) [2019-10-01 23:30:54,759 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-01 23:30:54,807 INFO L256 TraceCheckSpWp]: Trace formula consists of 297 conjuncts, 28 conjunts are in the unsatisfiable core [2019-10-01 23:30:54,810 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-01 23:30:54,873 INFO L134 CoverageAnalysis]: Checked inductivity of 1152 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 576 trivial. 0 not checked. [2019-10-01 23:30:54,895 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-01 23:30:54,895 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27] total 28 [2019-10-01 23:30:54,895 INFO L454 AbstractCegarLoop]: Interpolant automaton has 28 states [2019-10-01 23:30:54,897 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2019-10-01 23:30:54,898 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=378, Invalid=378, Unknown=0, NotChecked=0, Total=756 [2019-10-01 23:30:54,898 INFO L87 Difference]: Start difference. First operand 116 states and 118 transitions. Second operand 28 states. [2019-10-01 23:30:55,045 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-01 23:30:55,045 INFO L93 Difference]: Finished difference Result 183 states and 188 transitions. [2019-10-01 23:30:55,045 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2019-10-01 23:30:55,045 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 111 [2019-10-01 23:30:55,045 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-01 23:30:55,046 INFO L225 Difference]: With dead ends: 183 [2019-10-01 23:30:55,046 INFO L226 Difference]: Without dead ends: 122 [2019-10-01 23:30:55,047 INFO L640 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 111 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=378, Invalid=378, Unknown=0, NotChecked=0, Total=756 [2019-10-01 23:30:55,047 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2019-10-01 23:30:55,051 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 120. [2019-10-01 23:30:55,051 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 120 states. [2019-10-01 23:30:55,052 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 122 transitions. [2019-10-01 23:30:55,052 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 122 transitions. Word has length 111 [2019-10-01 23:30:55,052 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-01 23:30:55,052 INFO L475 AbstractCegarLoop]: Abstraction has 120 states and 122 transitions. [2019-10-01 23:30:55,053 INFO L476 AbstractCegarLoop]: Interpolant automaton has 28 states. [2019-10-01 23:30:55,053 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 122 transitions. [2019-10-01 23:30:55,053 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2019-10-01 23:30:55,053 INFO L403 BasicCegarLoop]: Found error trace [2019-10-01 23:30:55,054 INFO L411 BasicCegarLoop]: trace histogram [25, 25, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-01 23:30:55,054 INFO L418 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-01 23:30:55,054 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-01 23:30:55,054 INFO L82 PathProgramCache]: Analyzing trace with hash 93250114, now seen corresponding path program 25 times [2019-10-01 23:30:55,054 INFO L224 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-10-01 23:30:55,055 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-10-01 23:30:55,056 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-01 23:30:55,056 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-10-01 23:30:55,056 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-01 23:30:55,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-01 23:30:55,562 INFO L134 CoverageAnalysis]: Checked inductivity of 1250 backedges. 0 proven. 625 refuted. 0 times theorem prover too weak. 625 trivial. 0 not checked. [2019-10-01 23:30:55,562 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-10-01 23:30:55,563 INFO L224 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-10-01 23:30:55,630 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-01 23:30:55,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-01 23:30:55,704 INFO L256 TraceCheckSpWp]: Trace formula consists of 307 conjuncts, 27 conjunts are in the unsatisfiable core [2019-10-01 23:30:55,707 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-01 23:30:55,738 INFO L134 CoverageAnalysis]: Checked inductivity of 1250 backedges. 0 proven. 625 refuted. 0 times theorem prover too weak. 625 trivial. 0 not checked. [2019-10-01 23:30:55,744 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-01 23:30:55,745 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28] total 29 [2019-10-01 23:30:55,747 INFO L454 AbstractCegarLoop]: Interpolant automaton has 29 states [2019-10-01 23:30:55,749 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2019-10-01 23:30:55,749 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=406, Invalid=406, Unknown=0, NotChecked=0, Total=812 [2019-10-01 23:30:55,750 INFO L87 Difference]: Start difference. First operand 120 states and 122 transitions. Second operand 29 states. [2019-10-01 23:30:56,043 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-01 23:30:56,043 INFO L93 Difference]: Finished difference Result 189 states and 194 transitions. [2019-10-01 23:30:56,044 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2019-10-01 23:30:56,044 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 115 [2019-10-01 23:30:56,044 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-01 23:30:56,045 INFO L225 Difference]: With dead ends: 189 [2019-10-01 23:30:56,046 INFO L226 Difference]: Without dead ends: 126 [2019-10-01 23:30:56,047 INFO L640 BasicCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 115 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=406, Invalid=406, Unknown=0, NotChecked=0, Total=812 [2019-10-01 23:30:56,047 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2019-10-01 23:30:56,052 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 124. [2019-10-01 23:30:56,052 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 124 states. [2019-10-01 23:30:56,053 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 126 transitions. [2019-10-01 23:30:56,054 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 126 transitions. Word has length 115 [2019-10-01 23:30:56,054 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-01 23:30:56,054 INFO L475 AbstractCegarLoop]: Abstraction has 124 states and 126 transitions. [2019-10-01 23:30:56,054 INFO L476 AbstractCegarLoop]: Interpolant automaton has 29 states. [2019-10-01 23:30:56,055 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 126 transitions. [2019-10-01 23:30:56,056 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2019-10-01 23:30:56,056 INFO L403 BasicCegarLoop]: Found error trace [2019-10-01 23:30:56,056 INFO L411 BasicCegarLoop]: trace histogram [26, 26, 26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-01 23:30:56,057 INFO L418 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-01 23:30:56,057 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-01 23:30:56,057 INFO L82 PathProgramCache]: Analyzing trace with hash 1795354814, now seen corresponding path program 26 times [2019-10-01 23:30:56,057 INFO L224 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-10-01 23:30:56,058 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-10-01 23:30:56,059 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-01 23:30:56,060 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-01 23:30:56,060 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-01 23:30:56,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-01 23:30:56,538 INFO L134 CoverageAnalysis]: Checked inductivity of 1352 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 676 trivial. 0 not checked. [2019-10-01 23:30:56,538 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-10-01 23:30:56,538 INFO L224 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-10-01 23:30:56,569 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2019-10-01 23:30:56,631 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-01 23:30:56,631 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-01 23:30:56,633 INFO L256 TraceCheckSpWp]: Trace formula consists of 317 conjuncts, 28 conjunts are in the unsatisfiable core [2019-10-01 23:30:56,635 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-01 23:30:56,660 INFO L134 CoverageAnalysis]: Checked inductivity of 1352 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 676 trivial. 0 not checked. [2019-10-01 23:30:56,664 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-01 23:30:56,665 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29] total 30 [2019-10-01 23:30:56,665 INFO L454 AbstractCegarLoop]: Interpolant automaton has 30 states [2019-10-01 23:30:56,666 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2019-10-01 23:30:56,666 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=435, Invalid=435, Unknown=0, NotChecked=0, Total=870 [2019-10-01 23:30:56,666 INFO L87 Difference]: Start difference. First operand 124 states and 126 transitions. Second operand 30 states. [2019-10-01 23:30:56,873 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-01 23:30:56,874 INFO L93 Difference]: Finished difference Result 195 states and 200 transitions. [2019-10-01 23:30:56,874 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2019-10-01 23:30:56,874 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 119 [2019-10-01 23:30:56,874 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-01 23:30:56,875 INFO L225 Difference]: With dead ends: 195 [2019-10-01 23:30:56,875 INFO L226 Difference]: Without dead ends: 130 [2019-10-01 23:30:56,876 INFO L640 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 119 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 50 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=435, Invalid=435, Unknown=0, NotChecked=0, Total=870 [2019-10-01 23:30:56,876 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2019-10-01 23:30:56,879 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 128. [2019-10-01 23:30:56,880 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 128 states. [2019-10-01 23:30:56,880 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 130 transitions. [2019-10-01 23:30:56,881 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 130 transitions. Word has length 119 [2019-10-01 23:30:56,881 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-01 23:30:56,881 INFO L475 AbstractCegarLoop]: Abstraction has 128 states and 130 transitions. [2019-10-01 23:30:56,881 INFO L476 AbstractCegarLoop]: Interpolant automaton has 30 states. [2019-10-01 23:30:56,881 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 130 transitions. [2019-10-01 23:30:56,882 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2019-10-01 23:30:56,882 INFO L403 BasicCegarLoop]: Found error trace [2019-10-01 23:30:56,882 INFO L411 BasicCegarLoop]: trace histogram [27, 27, 27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-01 23:30:56,882 INFO L418 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-01 23:30:56,883 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-01 23:30:56,883 INFO L82 PathProgramCache]: Analyzing trace with hash -1367322310, now seen corresponding path program 27 times [2019-10-01 23:30:56,883 INFO L224 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-10-01 23:30:56,883 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-10-01 23:30:56,884 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-01 23:30:56,884 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-10-01 23:30:56,885 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-01 23:30:56,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-01 23:30:57,394 INFO L134 CoverageAnalysis]: Checked inductivity of 1458 backedges. 0 proven. 729 refuted. 0 times theorem prover too weak. 729 trivial. 0 not checked. [2019-10-01 23:30:57,395 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-10-01 23:30:57,395 INFO L224 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-10-01 23:30:57,450 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-10-01 23:32:18,709 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 28 check-sat command(s) [2019-10-01 23:32:18,710 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-01 23:32:18,729 INFO L256 TraceCheckSpWp]: Trace formula consists of 327 conjuncts, 31 conjunts are in the unsatisfiable core [2019-10-01 23:32:18,731 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-01 23:32:18,754 INFO L134 CoverageAnalysis]: Checked inductivity of 1458 backedges. 0 proven. 729 refuted. 0 times theorem prover too weak. 729 trivial. 0 not checked. [2019-10-01 23:32:18,772 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-01 23:32:18,773 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30] total 31 [2019-10-01 23:32:18,773 INFO L454 AbstractCegarLoop]: Interpolant automaton has 31 states [2019-10-01 23:32:18,774 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2019-10-01 23:32:18,774 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=465, Invalid=465, Unknown=0, NotChecked=0, Total=930 [2019-10-01 23:32:18,774 INFO L87 Difference]: Start difference. First operand 128 states and 130 transitions. Second operand 31 states. [2019-10-01 23:32:18,993 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-01 23:32:18,993 INFO L93 Difference]: Finished difference Result 201 states and 206 transitions. [2019-10-01 23:32:18,993 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2019-10-01 23:32:18,994 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 123 [2019-10-01 23:32:18,994 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-01 23:32:18,995 INFO L225 Difference]: With dead ends: 201 [2019-10-01 23:32:18,995 INFO L226 Difference]: Without dead ends: 134 [2019-10-01 23:32:18,996 INFO L640 BasicCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 123 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=465, Invalid=465, Unknown=0, NotChecked=0, Total=930 [2019-10-01 23:32:18,996 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2019-10-01 23:32:18,999 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 132. [2019-10-01 23:32:19,000 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 132 states. [2019-10-01 23:32:19,000 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 134 transitions. [2019-10-01 23:32:19,000 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 134 transitions. Word has length 123 [2019-10-01 23:32:19,001 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-01 23:32:19,001 INFO L475 AbstractCegarLoop]: Abstraction has 132 states and 134 transitions. [2019-10-01 23:32:19,001 INFO L476 AbstractCegarLoop]: Interpolant automaton has 31 states. [2019-10-01 23:32:19,001 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 134 transitions. [2019-10-01 23:32:19,002 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2019-10-01 23:32:19,002 INFO L403 BasicCegarLoop]: Found error trace [2019-10-01 23:32:19,002 INFO L411 BasicCegarLoop]: trace histogram [28, 28, 28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-01 23:32:19,002 INFO L418 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-01 23:32:19,003 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-01 23:32:19,003 INFO L82 PathProgramCache]: Analyzing trace with hash -544078922, now seen corresponding path program 28 times [2019-10-01 23:32:19,003 INFO L224 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-10-01 23:32:19,003 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-10-01 23:32:19,004 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-01 23:32:19,004 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-10-01 23:32:19,004 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-01 23:32:19,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-01 23:32:19,552 INFO L134 CoverageAnalysis]: Checked inductivity of 1568 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 784 trivial. 0 not checked. [2019-10-01 23:32:19,554 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-10-01 23:32:19,554 INFO L224 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-10-01 23:32:19,618 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-10-01 23:32:19,693 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-01 23:32:19,694 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-01 23:32:19,696 INFO L256 TraceCheckSpWp]: Trace formula consists of 337 conjuncts, 30 conjunts are in the unsatisfiable core [2019-10-01 23:32:19,699 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-01 23:32:19,738 INFO L134 CoverageAnalysis]: Checked inductivity of 1568 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 784 trivial. 0 not checked. [2019-10-01 23:32:19,742 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-01 23:32:19,742 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31] total 32 [2019-10-01 23:32:19,743 INFO L454 AbstractCegarLoop]: Interpolant automaton has 32 states [2019-10-01 23:32:19,743 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2019-10-01 23:32:19,744 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=496, Invalid=496, Unknown=0, NotChecked=0, Total=992 [2019-10-01 23:32:19,744 INFO L87 Difference]: Start difference. First operand 132 states and 134 transitions. Second operand 32 states. [2019-10-01 23:32:19,967 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-01 23:32:19,967 INFO L93 Difference]: Finished difference Result 207 states and 212 transitions. [2019-10-01 23:32:19,967 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2019-10-01 23:32:19,967 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 127 [2019-10-01 23:32:19,968 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-01 23:32:19,968 INFO L225 Difference]: With dead ends: 207 [2019-10-01 23:32:19,969 INFO L226 Difference]: Without dead ends: 138 [2019-10-01 23:32:19,970 INFO L640 BasicCegarLoop]: 0 DeclaredPredicates, 157 GetRequests, 127 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=496, Invalid=496, Unknown=0, NotChecked=0, Total=992 [2019-10-01 23:32:19,970 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2019-10-01 23:32:19,974 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 136. [2019-10-01 23:32:19,974 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 136 states. [2019-10-01 23:32:19,975 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 138 transitions. [2019-10-01 23:32:19,975 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 138 transitions. Word has length 127 [2019-10-01 23:32:19,975 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-01 23:32:19,976 INFO L475 AbstractCegarLoop]: Abstraction has 136 states and 138 transitions. [2019-10-01 23:32:19,976 INFO L476 AbstractCegarLoop]: Interpolant automaton has 32 states. [2019-10-01 23:32:19,976 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 138 transitions. [2019-10-01 23:32:19,976 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2019-10-01 23:32:19,976 INFO L403 BasicCegarLoop]: Found error trace [2019-10-01 23:32:19,977 INFO L411 BasicCegarLoop]: trace histogram [29, 29, 29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-01 23:32:19,977 INFO L418 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-01 23:32:19,977 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-01 23:32:19,978 INFO L82 PathProgramCache]: Analyzing trace with hash 1061357618, now seen corresponding path program 29 times [2019-10-01 23:32:19,978 INFO L224 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-10-01 23:32:19,978 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-10-01 23:32:19,979 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-01 23:32:19,979 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-10-01 23:32:19,980 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-01 23:32:20,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-01 23:32:20,403 INFO L134 CoverageAnalysis]: Checked inductivity of 1682 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 841 trivial. 0 not checked. [2019-10-01 23:32:20,404 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-10-01 23:32:20,404 INFO L224 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-10-01 23:32:20,449 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2019-10-01 23:34:35,009 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 30 check-sat command(s) [2019-10-01 23:34:35,010 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-01 23:34:35,069 INFO L256 TraceCheckSpWp]: Trace formula consists of 347 conjuncts, 31 conjunts are in the unsatisfiable core [2019-10-01 23:34:35,071 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-01 23:34:35,118 INFO L134 CoverageAnalysis]: Checked inductivity of 1682 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 841 trivial. 0 not checked. [2019-10-01 23:34:35,148 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-01 23:34:35,148 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32] total 33 [2019-10-01 23:34:35,149 INFO L454 AbstractCegarLoop]: Interpolant automaton has 33 states [2019-10-01 23:34:35,149 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2019-10-01 23:34:35,150 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=528, Invalid=528, Unknown=0, NotChecked=0, Total=1056 [2019-10-01 23:34:35,151 INFO L87 Difference]: Start difference. First operand 136 states and 138 transitions. Second operand 33 states. [2019-10-01 23:34:35,400 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-01 23:34:35,400 INFO L93 Difference]: Finished difference Result 213 states and 218 transitions. [2019-10-01 23:34:35,401 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2019-10-01 23:34:35,401 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 131 [2019-10-01 23:34:35,401 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-01 23:34:35,402 INFO L225 Difference]: With dead ends: 213 [2019-10-01 23:34:35,403 INFO L226 Difference]: Without dead ends: 142 [2019-10-01 23:34:35,404 INFO L640 BasicCegarLoop]: 0 DeclaredPredicates, 162 GetRequests, 131 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=528, Invalid=528, Unknown=0, NotChecked=0, Total=1056 [2019-10-01 23:34:35,404 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2019-10-01 23:34:35,409 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 140. [2019-10-01 23:34:35,409 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 140 states. [2019-10-01 23:34:35,410 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 142 transitions. [2019-10-01 23:34:35,410 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 142 transitions. Word has length 131 [2019-10-01 23:34:35,411 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-01 23:34:35,411 INFO L475 AbstractCegarLoop]: Abstraction has 140 states and 142 transitions. [2019-10-01 23:34:35,411 INFO L476 AbstractCegarLoop]: Interpolant automaton has 33 states. [2019-10-01 23:34:35,411 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 142 transitions. [2019-10-01 23:34:35,412 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2019-10-01 23:34:35,412 INFO L403 BasicCegarLoop]: Found error trace [2019-10-01 23:34:35,413 INFO L411 BasicCegarLoop]: trace histogram [30, 30, 30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-01 23:34:35,414 INFO L418 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-01 23:34:35,415 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-01 23:34:35,415 INFO L82 PathProgramCache]: Analyzing trace with hash -1071751506, now seen corresponding path program 30 times [2019-10-01 23:34:35,416 INFO L224 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-10-01 23:34:35,416 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-10-01 23:34:35,417 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-01 23:34:35,418 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-10-01 23:34:35,418 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-01 23:34:35,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-01 23:34:36,102 INFO L134 CoverageAnalysis]: Checked inductivity of 1800 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 900 trivial. 0 not checked. [2019-10-01 23:34:36,103 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-10-01 23:34:36,103 INFO L224 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-10-01 23:34:36,147 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2019-10-01 23:37:31,343 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 31 check-sat command(s) [2019-10-01 23:37:31,344 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-01 23:37:31,415 INFO L256 TraceCheckSpWp]: Trace formula consists of 357 conjuncts, 32 conjunts are in the unsatisfiable core [2019-10-01 23:37:31,417 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-01 23:37:31,445 INFO L134 CoverageAnalysis]: Checked inductivity of 1800 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 900 trivial. 0 not checked. [2019-10-01 23:37:31,470 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-01 23:37:31,470 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33] total 34 [2019-10-01 23:37:31,471 INFO L454 AbstractCegarLoop]: Interpolant automaton has 34 states [2019-10-01 23:37:31,471 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2019-10-01 23:37:31,472 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=561, Invalid=561, Unknown=0, NotChecked=0, Total=1122 [2019-10-01 23:37:31,472 INFO L87 Difference]: Start difference. First operand 140 states and 142 transitions. Second operand 34 states. [2019-10-01 23:37:31,667 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-01 23:37:31,668 INFO L93 Difference]: Finished difference Result 219 states and 224 transitions. [2019-10-01 23:37:31,668 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2019-10-01 23:37:31,668 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 135 [2019-10-01 23:37:31,669 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-01 23:37:31,669 INFO L225 Difference]: With dead ends: 219 [2019-10-01 23:37:31,670 INFO L226 Difference]: Without dead ends: 146 [2019-10-01 23:37:31,671 INFO L640 BasicCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 135 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 58 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=561, Invalid=561, Unknown=0, NotChecked=0, Total=1122 [2019-10-01 23:37:31,671 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2019-10-01 23:37:31,675 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 144. [2019-10-01 23:37:31,675 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 144 states. [2019-10-01 23:37:31,676 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 146 transitions. [2019-10-01 23:37:31,676 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 146 transitions. Word has length 135 [2019-10-01 23:37:31,676 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-01 23:37:31,676 INFO L475 AbstractCegarLoop]: Abstraction has 144 states and 146 transitions. [2019-10-01 23:37:31,676 INFO L476 AbstractCegarLoop]: Interpolant automaton has 34 states. [2019-10-01 23:37:31,677 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 146 transitions. [2019-10-01 23:37:31,677 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2019-10-01 23:37:31,677 INFO L403 BasicCegarLoop]: Found error trace [2019-10-01 23:37:31,678 INFO L411 BasicCegarLoop]: trace histogram [31, 31, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-01 23:37:31,678 INFO L418 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-01 23:37:31,678 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-01 23:37:31,678 INFO L82 PathProgramCache]: Analyzing trace with hash -2043738326, now seen corresponding path program 31 times [2019-10-01 23:37:31,678 INFO L224 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-10-01 23:37:31,678 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-10-01 23:37:31,680 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-01 23:37:31,680 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-10-01 23:37:31,680 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-01 23:37:31,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-01 23:37:32,275 INFO L134 CoverageAnalysis]: Checked inductivity of 1922 backedges. 0 proven. 961 refuted. 0 times theorem prover too weak. 961 trivial. 0 not checked. [2019-10-01 23:37:32,276 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-10-01 23:37:32,276 INFO L224 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-10-01 23:37:32,321 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-01 23:37:32,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-01 23:37:32,384 INFO L256 TraceCheckSpWp]: Trace formula consists of 367 conjuncts, 33 conjunts are in the unsatisfiable core [2019-10-01 23:37:32,387 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-01 23:37:32,428 INFO L134 CoverageAnalysis]: Checked inductivity of 1922 backedges. 0 proven. 961 refuted. 0 times theorem prover too weak. 961 trivial. 0 not checked. [2019-10-01 23:37:32,433 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-01 23:37:32,433 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34] total 35 [2019-10-01 23:37:32,434 INFO L454 AbstractCegarLoop]: Interpolant automaton has 35 states [2019-10-01 23:37:32,434 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2019-10-01 23:37:32,435 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=595, Invalid=595, Unknown=0, NotChecked=0, Total=1190 [2019-10-01 23:37:32,435 INFO L87 Difference]: Start difference. First operand 144 states and 146 transitions. Second operand 35 states. [2019-10-01 23:37:32,659 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-01 23:37:32,659 INFO L93 Difference]: Finished difference Result 225 states and 230 transitions. [2019-10-01 23:37:32,660 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2019-10-01 23:37:32,660 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 139 [2019-10-01 23:37:32,661 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-01 23:37:32,662 INFO L225 Difference]: With dead ends: 225 [2019-10-01 23:37:32,662 INFO L226 Difference]: Without dead ends: 150 [2019-10-01 23:37:32,663 INFO L640 BasicCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 139 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 60 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=595, Invalid=595, Unknown=0, NotChecked=0, Total=1190 [2019-10-01 23:37:32,663 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2019-10-01 23:37:32,668 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 148. [2019-10-01 23:37:32,668 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 148 states. [2019-10-01 23:37:32,669 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 150 transitions. [2019-10-01 23:37:32,669 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 150 transitions. Word has length 139 [2019-10-01 23:37:32,669 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-01 23:37:32,669 INFO L475 AbstractCegarLoop]: Abstraction has 148 states and 150 transitions. [2019-10-01 23:37:32,669 INFO L476 AbstractCegarLoop]: Interpolant automaton has 35 states. [2019-10-01 23:37:32,670 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 150 transitions. [2019-10-01 23:37:32,670 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2019-10-01 23:37:32,670 INFO L403 BasicCegarLoop]: Found error trace [2019-10-01 23:37:32,671 INFO L411 BasicCegarLoop]: trace histogram [32, 32, 32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-01 23:37:32,671 INFO L418 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-01 23:37:32,671 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-01 23:37:32,671 INFO L82 PathProgramCache]: Analyzing trace with hash 1728053670, now seen corresponding path program 32 times [2019-10-01 23:37:32,672 INFO L224 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-10-01 23:37:32,672 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-10-01 23:37:32,673 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-01 23:37:32,674 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-01 23:37:32,674 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-01 23:37:32,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-01 23:37:33,378 INFO L134 CoverageAnalysis]: Checked inductivity of 2048 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 1024 trivial. 0 not checked. [2019-10-01 23:37:33,378 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-10-01 23:37:33,378 INFO L224 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-10-01 23:37:33,419 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2019-10-01 23:37:33,486 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-01 23:37:33,486 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-01 23:37:33,488 INFO L256 TraceCheckSpWp]: Trace formula consists of 377 conjuncts, 34 conjunts are in the unsatisfiable core [2019-10-01 23:37:33,490 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-01 23:37:33,526 INFO L134 CoverageAnalysis]: Checked inductivity of 2048 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 1024 trivial. 0 not checked. [2019-10-01 23:37:33,538 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-01 23:37:33,539 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35] total 36 [2019-10-01 23:37:33,539 INFO L454 AbstractCegarLoop]: Interpolant automaton has 36 states [2019-10-01 23:37:33,540 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2019-10-01 23:37:33,540 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=630, Invalid=630, Unknown=0, NotChecked=0, Total=1260 [2019-10-01 23:37:33,540 INFO L87 Difference]: Start difference. First operand 148 states and 150 transitions. Second operand 36 states. [2019-10-01 23:37:33,772 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-01 23:37:33,773 INFO L93 Difference]: Finished difference Result 231 states and 236 transitions. [2019-10-01 23:37:33,773 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2019-10-01 23:37:33,773 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 143 [2019-10-01 23:37:33,773 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-01 23:37:33,774 INFO L225 Difference]: With dead ends: 231 [2019-10-01 23:37:33,774 INFO L226 Difference]: Without dead ends: 154 [2019-10-01 23:37:33,775 INFO L640 BasicCegarLoop]: 0 DeclaredPredicates, 177 GetRequests, 143 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 62 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=630, Invalid=630, Unknown=0, NotChecked=0, Total=1260 [2019-10-01 23:37:33,776 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 154 states. [2019-10-01 23:37:33,779 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 154 to 152. [2019-10-01 23:37:33,779 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 152 states. [2019-10-01 23:37:33,780 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 154 transitions. [2019-10-01 23:37:33,780 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 154 transitions. Word has length 143 [2019-10-01 23:37:33,781 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-01 23:37:33,781 INFO L475 AbstractCegarLoop]: Abstraction has 152 states and 154 transitions. [2019-10-01 23:37:33,781 INFO L476 AbstractCegarLoop]: Interpolant automaton has 36 states. [2019-10-01 23:37:33,781 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 154 transitions. [2019-10-01 23:37:33,782 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2019-10-01 23:37:33,782 INFO L403 BasicCegarLoop]: Found error trace [2019-10-01 23:37:33,782 INFO L411 BasicCegarLoop]: trace histogram [33, 33, 33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-01 23:37:33,782 INFO L418 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-01 23:37:33,783 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-01 23:37:33,783 INFO L82 PathProgramCache]: Analyzing trace with hash 1771851298, now seen corresponding path program 33 times [2019-10-01 23:37:33,783 INFO L224 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-10-01 23:37:33,783 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-10-01 23:37:33,784 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-01 23:37:33,784 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-10-01 23:37:33,785 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-01 23:37:33,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-01 23:37:34,577 INFO L134 CoverageAnalysis]: Checked inductivity of 2178 backedges. 0 proven. 1089 refuted. 0 times theorem prover too weak. 1089 trivial. 0 not checked. [2019-10-01 23:37:34,577 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-10-01 23:37:34,578 INFO L224 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-10-01 23:37:34,645 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-10-01 23:40:20,597 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 34 check-sat command(s) [2019-10-01 23:40:20,598 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-01 23:40:20,637 INFO L256 TraceCheckSpWp]: Trace formula consists of 387 conjuncts, 37 conjunts are in the unsatisfiable core [2019-10-01 23:40:20,639 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-01 23:40:20,679 INFO L134 CoverageAnalysis]: Checked inductivity of 2178 backedges. 0 proven. 1089 refuted. 0 times theorem prover too weak. 1089 trivial. 0 not checked. [2019-10-01 23:40:20,700 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-01 23:40:20,700 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36] total 37 [2019-10-01 23:40:20,700 INFO L454 AbstractCegarLoop]: Interpolant automaton has 37 states [2019-10-01 23:40:20,701 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2019-10-01 23:40:20,701 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=666, Invalid=666, Unknown=0, NotChecked=0, Total=1332 [2019-10-01 23:40:20,702 INFO L87 Difference]: Start difference. First operand 152 states and 154 transitions. Second operand 37 states. [2019-10-01 23:40:20,956 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-01 23:40:20,956 INFO L93 Difference]: Finished difference Result 237 states and 242 transitions. [2019-10-01 23:40:20,957 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2019-10-01 23:40:20,957 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 147 [2019-10-01 23:40:20,957 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-01 23:40:20,958 INFO L225 Difference]: With dead ends: 237 [2019-10-01 23:40:20,958 INFO L226 Difference]: Without dead ends: 158 [2019-10-01 23:40:20,959 INFO L640 BasicCegarLoop]: 0 DeclaredPredicates, 182 GetRequests, 147 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=666, Invalid=666, Unknown=0, NotChecked=0, Total=1332 [2019-10-01 23:40:20,959 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 158 states. [2019-10-01 23:40:20,963 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 158 to 156. [2019-10-01 23:40:20,963 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 156 states. [2019-10-01 23:40:20,964 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 158 transitions. [2019-10-01 23:40:20,964 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 158 transitions. Word has length 147 [2019-10-01 23:40:20,964 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-01 23:40:20,965 INFO L475 AbstractCegarLoop]: Abstraction has 156 states and 158 transitions. [2019-10-01 23:40:20,965 INFO L476 AbstractCegarLoop]: Interpolant automaton has 37 states. [2019-10-01 23:40:20,965 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 158 transitions. [2019-10-01 23:40:20,966 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 152 [2019-10-01 23:40:20,966 INFO L403 BasicCegarLoop]: Found error trace [2019-10-01 23:40:20,966 INFO L411 BasicCegarLoop]: trace histogram [34, 34, 34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-01 23:40:20,966 INFO L418 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-01 23:40:20,966 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-01 23:40:20,966 INFO L82 PathProgramCache]: Analyzing trace with hash 1183771806, now seen corresponding path program 34 times [2019-10-01 23:40:20,967 INFO L224 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-10-01 23:40:20,967 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-10-01 23:40:20,968 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-01 23:40:20,968 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-10-01 23:40:20,968 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-01 23:40:20,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-01 23:40:21,620 INFO L134 CoverageAnalysis]: Checked inductivity of 2312 backedges. 0 proven. 1156 refuted. 0 times theorem prover too weak. 1156 trivial. 0 not checked. [2019-10-01 23:40:21,620 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-10-01 23:40:21,621 INFO L224 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-10-01 23:40:21,676 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-10-01 23:40:21,747 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-01 23:40:21,747 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-01 23:40:21,749 INFO L256 TraceCheckSpWp]: Trace formula consists of 397 conjuncts, 36 conjunts are in the unsatisfiable core [2019-10-01 23:40:21,751 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-01 23:40:21,783 INFO L134 CoverageAnalysis]: Checked inductivity of 2312 backedges. 0 proven. 1156 refuted. 0 times theorem prover too weak. 1156 trivial. 0 not checked. [2019-10-01 23:40:21,788 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-01 23:40:21,788 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37] total 38 [2019-10-01 23:40:21,789 INFO L454 AbstractCegarLoop]: Interpolant automaton has 38 states [2019-10-01 23:40:21,789 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2019-10-01 23:40:21,790 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=703, Invalid=703, Unknown=0, NotChecked=0, Total=1406 [2019-10-01 23:40:21,790 INFO L87 Difference]: Start difference. First operand 156 states and 158 transitions. Second operand 38 states. [2019-10-01 23:40:22,040 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-01 23:40:22,040 INFO L93 Difference]: Finished difference Result 243 states and 248 transitions. [2019-10-01 23:40:22,041 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2019-10-01 23:40:22,041 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 151 [2019-10-01 23:40:22,041 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-01 23:40:22,042 INFO L225 Difference]: With dead ends: 243 [2019-10-01 23:40:22,042 INFO L226 Difference]: Without dead ends: 162 [2019-10-01 23:40:22,043 INFO L640 BasicCegarLoop]: 0 DeclaredPredicates, 187 GetRequests, 151 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=703, Invalid=703, Unknown=0, NotChecked=0, Total=1406 [2019-10-01 23:40:22,044 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2019-10-01 23:40:22,047 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 160. [2019-10-01 23:40:22,047 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 160 states. [2019-10-01 23:40:22,048 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 162 transitions. [2019-10-01 23:40:22,049 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 162 transitions. Word has length 151 [2019-10-01 23:40:22,049 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-01 23:40:22,049 INFO L475 AbstractCegarLoop]: Abstraction has 160 states and 162 transitions. [2019-10-01 23:40:22,049 INFO L476 AbstractCegarLoop]: Interpolant automaton has 38 states. [2019-10-01 23:40:22,049 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 162 transitions. [2019-10-01 23:40:22,050 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2019-10-01 23:40:22,050 INFO L403 BasicCegarLoop]: Found error trace [2019-10-01 23:40:22,050 INFO L411 BasicCegarLoop]: trace histogram [35, 35, 35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-01 23:40:22,050 INFO L418 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-01 23:40:22,051 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-01 23:40:22,051 INFO L82 PathProgramCache]: Analyzing trace with hash -404562662, now seen corresponding path program 35 times [2019-10-01 23:40:22,051 INFO L224 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-10-01 23:40:22,051 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-10-01 23:40:22,052 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-01 23:40:22,052 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-10-01 23:40:22,053 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-01 23:40:22,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-01 23:40:22,629 INFO L134 CoverageAnalysis]: Checked inductivity of 2450 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 1225 trivial. 0 not checked. [2019-10-01 23:40:22,630 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-10-01 23:40:22,630 INFO L224 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-10-01 23:40:22,672 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1