java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-new/nested-1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-fea9116 [2019-09-20 12:58:35,530 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-09-20 12:58:35,532 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-09-20 12:58:35,544 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-09-20 12:58:35,544 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-09-20 12:58:35,545 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-09-20 12:58:35,547 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-09-20 12:58:35,548 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-09-20 12:58:35,550 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-09-20 12:58:35,551 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-09-20 12:58:35,552 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-09-20 12:58:35,553 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-09-20 12:58:35,553 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-09-20 12:58:35,554 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-09-20 12:58:35,555 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-09-20 12:58:35,556 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-09-20 12:58:35,557 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-09-20 12:58:35,558 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-09-20 12:58:35,560 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-09-20 12:58:35,562 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-09-20 12:58:35,563 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-09-20 12:58:35,564 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-09-20 12:58:35,565 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-09-20 12:58:35,566 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-09-20 12:58:35,568 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-09-20 12:58:35,575 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-09-20 12:58:35,576 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-09-20 12:58:35,577 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-09-20 12:58:35,578 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2019-09-20 12:58:35,592 INFO L113 SettingsManager]: Loading preferences was successful [2019-09-20 12:58:35,592 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-09-20 12:58:35,593 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-09-20 12:58:35,593 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-09-20 12:58:35,593 INFO L138 SettingsManager]: * Use SBE=true [2019-09-20 12:58:35,594 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-09-20 12:58:35,594 INFO L138 SettingsManager]: * sizeof long=4 [2019-09-20 12:58:35,594 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-09-20 12:58:35,594 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-09-20 12:58:35,594 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-09-20 12:58:35,595 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-09-20 12:58:35,595 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-09-20 12:58:35,595 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-09-20 12:58:35,595 INFO L138 SettingsManager]: * sizeof long double=12 [2019-09-20 12:58:35,595 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-09-20 12:58:35,596 INFO L138 SettingsManager]: * Use constant arrays=true [2019-09-20 12:58:35,596 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-09-20 12:58:35,596 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-09-20 12:58:35,596 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-09-20 12:58:35,596 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-09-20 12:58:35,597 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-09-20 12:58:35,597 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-09-20 12:58:35,597 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-09-20 12:58:35,597 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-09-20 12:58:35,598 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-09-20 12:58:35,598 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-09-20 12:58:35,598 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-09-20 12:58:35,598 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-09-20 12:58:35,598 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-09-20 12:58:35,626 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-09-20 12:58:35,639 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-09-20 12:58:35,644 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-09-20 12:58:35,645 INFO L271 PluginConnector]: Initializing CDTParser... [2019-09-20 12:58:35,646 INFO L275 PluginConnector]: CDTParser initialized [2019-09-20 12:58:35,648 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-new/nested-1.i [2019-09-20 12:58:35,708 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1337ea890/8503246cca9d43ab950dd48c2526589b/FLAG1c68bee7a [2019-09-20 12:58:36,110 INFO L306 CDTParser]: Found 1 translation units. [2019-09-20 12:58:36,110 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-new/nested-1.i [2019-09-20 12:58:36,116 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1337ea890/8503246cca9d43ab950dd48c2526589b/FLAG1c68bee7a [2019-09-20 12:58:36,522 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1337ea890/8503246cca9d43ab950dd48c2526589b [2019-09-20 12:58:36,532 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-09-20 12:58:36,534 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-09-20 12:58:36,535 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-09-20 12:58:36,535 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-09-20 12:58:36,538 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-09-20 12:58:36,539 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.09 12:58:36" (1/1) ... [2019-09-20 12:58:36,542 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@58e28d1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 12:58:36, skipping insertion in model container [2019-09-20 12:58:36,542 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.09 12:58:36" (1/1) ... [2019-09-20 12:58:36,549 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-09-20 12:58:36,565 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-09-20 12:58:36,761 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-09-20 12:58:36,768 INFO L188 MainTranslator]: Completed pre-run [2019-09-20 12:58:36,789 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-09-20 12:58:36,806 INFO L192 MainTranslator]: Completed translation [2019-09-20 12:58:36,807 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 12:58:36 WrapperNode [2019-09-20 12:58:36,807 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-09-20 12:58:36,808 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-09-20 12:58:36,808 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-09-20 12:58:36,808 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-09-20 12:58:36,908 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 12:58:36" (1/1) ... [2019-09-20 12:58:36,908 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 12:58:36" (1/1) ... [2019-09-20 12:58:36,914 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 12:58:36" (1/1) ... [2019-09-20 12:58:36,914 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 12:58:36" (1/1) ... [2019-09-20 12:58:36,918 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 12:58:36" (1/1) ... [2019-09-20 12:58:36,923 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 12:58:36" (1/1) ... [2019-09-20 12:58:36,924 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 12:58:36" (1/1) ... [2019-09-20 12:58:36,925 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-09-20 12:58:36,925 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-09-20 12:58:36,926 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-09-20 12:58:36,926 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-09-20 12:58:36,927 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 12:58:36" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-09-20 12:58:36,985 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-09-20 12:58:36,985 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-09-20 12:58:36,985 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-09-20 12:58:36,985 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-09-20 12:58:36,985 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-09-20 12:58:36,985 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assume [2019-09-20 12:58:36,985 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-09-20 12:58:36,985 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-09-20 12:58:36,986 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-09-20 12:58:36,986 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-09-20 12:58:36,986 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-09-20 12:58:37,162 INFO L278 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-09-20 12:58:37,162 INFO L283 CfgBuilder]: Removed 2 assume(true) statements. [2019-09-20 12:58:37,163 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.09 12:58:37 BoogieIcfgContainer [2019-09-20 12:58:37,164 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-09-20 12:58:37,165 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-09-20 12:58:37,165 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-09-20 12:58:37,168 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-09-20 12:58:37,169 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.09 12:58:36" (1/3) ... [2019-09-20 12:58:37,169 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@30beaa9c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.09 12:58:37, skipping insertion in model container [2019-09-20 12:58:37,170 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 12:58:36" (2/3) ... [2019-09-20 12:58:37,170 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@30beaa9c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.09 12:58:37, skipping insertion in model container [2019-09-20 12:58:37,170 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.09 12:58:37" (3/3) ... [2019-09-20 12:58:37,172 INFO L109 eAbstractionObserver]: Analyzing ICFG nested-1.i [2019-09-20 12:58:37,182 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-09-20 12:58:37,189 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-09-20 12:58:37,206 INFO L252 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-09-20 12:58:37,236 INFO L128 ementStrategyFactory]: Using default assertion order modulation [2019-09-20 12:58:37,237 INFO L377 AbstractCegarLoop]: Interprodecural is true [2019-09-20 12:58:37,237 INFO L378 AbstractCegarLoop]: Hoare is true [2019-09-20 12:58:37,237 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-09-20 12:58:37,238 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-09-20 12:58:37,238 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-09-20 12:58:37,238 INFO L382 AbstractCegarLoop]: Difference is false [2019-09-20 12:58:37,238 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-09-20 12:58:37,238 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-09-20 12:58:37,256 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states. [2019-09-20 12:58:37,261 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2019-09-20 12:58:37,262 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 12:58:37,263 INFO L407 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 12:58:37,265 INFO L418 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 12:58:37,269 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 12:58:37,270 INFO L82 PathProgramCache]: Analyzing trace with hash -1266359381, now seen corresponding path program 1 times [2019-09-20 12:58:37,271 INFO L224 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-20 12:58:37,272 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-20 12:58:37,319 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 12:58:37,320 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-20 12:58:37,320 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 12:58:37,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 12:58:37,429 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-20 12:58:37,432 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-09-20 12:58:37,432 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-09-20 12:58:37,437 INFO L454 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-09-20 12:58:37,453 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-09-20 12:58:37,454 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-09-20 12:58:37,457 INFO L87 Difference]: Start difference. First operand 23 states. Second operand 4 states. [2019-09-20 12:58:37,575 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-20 12:58:37,575 INFO L93 Difference]: Finished difference Result 45 states and 60 transitions. [2019-09-20 12:58:37,576 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-09-20 12:58:37,578 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 12 [2019-09-20 12:58:37,578 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-20 12:58:37,594 INFO L225 Difference]: With dead ends: 45 [2019-09-20 12:58:37,595 INFO L226 Difference]: Without dead ends: 20 [2019-09-20 12:58:37,598 INFO L636 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2019-09-20 12:58:37,619 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2019-09-20 12:58:37,642 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 17. [2019-09-20 12:58:37,644 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2019-09-20 12:58:37,645 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2019-09-20 12:58:37,648 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 12 [2019-09-20 12:58:37,649 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-20 12:58:37,649 INFO L475 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2019-09-20 12:58:37,649 INFO L476 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-09-20 12:58:37,649 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2019-09-20 12:58:37,650 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-09-20 12:58:37,651 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 12:58:37,652 INFO L407 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 12:58:37,652 INFO L418 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 12:58:37,653 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 12:58:37,655 INFO L82 PathProgramCache]: Analyzing trace with hash -1008321469, now seen corresponding path program 1 times [2019-09-20 12:58:37,655 INFO L224 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-20 12:58:37,655 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-20 12:58:37,661 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 12:58:37,661 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-20 12:58:37,662 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 12:58:37,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 12:58:37,746 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-20 12:58:37,746 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-09-20 12:58:37,746 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-09-20 12:58:37,748 INFO L454 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-09-20 12:58:37,749 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-09-20 12:58:37,749 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-09-20 12:58:37,750 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand 4 states. [2019-09-20 12:58:37,822 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-20 12:58:37,823 INFO L93 Difference]: Finished difference Result 28 states and 31 transitions. [2019-09-20 12:58:37,823 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-09-20 12:58:37,824 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 15 [2019-09-20 12:58:37,824 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-20 12:58:37,825 INFO L225 Difference]: With dead ends: 28 [2019-09-20 12:58:37,828 INFO L226 Difference]: Without dead ends: 19 [2019-09-20 12:58:37,831 INFO L636 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2019-09-20 12:58:37,832 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2019-09-20 12:58:37,845 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 18. [2019-09-20 12:58:37,846 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2019-09-20 12:58:37,847 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2019-09-20 12:58:37,849 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 15 [2019-09-20 12:58:37,850 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-20 12:58:37,851 INFO L475 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2019-09-20 12:58:37,851 INFO L476 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-09-20 12:58:37,851 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2019-09-20 12:58:37,852 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2019-09-20 12:58:37,852 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 12:58:37,852 INFO L407 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 12:58:37,853 INFO L418 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 12:58:37,853 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 12:58:37,854 INFO L82 PathProgramCache]: Analyzing trace with hash 1823795457, now seen corresponding path program 1 times [2019-09-20 12:58:37,854 INFO L224 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-20 12:58:37,854 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-20 12:58:37,858 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 12:58:37,858 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-20 12:58:37,859 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 12:58:37,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 12:58:38,047 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-20 12:58:38,049 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 12:58:38,050 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) [2019-09-20 12:58:38,075 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-20 12:58:38,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 12:58:38,104 INFO L256 TraceCheckSpWp]: Trace formula consists of 47 conjuncts, 4 conjunts are in the unsatisfiable core [2019-09-20 12:58:38,111 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-20 12:58:38,214 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-20 12:58:38,219 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-20 12:58:38,219 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 5] total 11 [2019-09-20 12:58:38,220 INFO L454 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-09-20 12:58:38,220 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-09-20 12:58:38,221 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=86, Unknown=0, NotChecked=0, Total=110 [2019-09-20 12:58:38,221 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 11 states. [2019-09-20 12:58:38,498 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-20 12:58:38,498 INFO L93 Difference]: Finished difference Result 38 states and 43 transitions. [2019-09-20 12:58:38,499 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-09-20 12:58:38,499 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 17 [2019-09-20 12:58:38,499 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-20 12:58:38,500 INFO L225 Difference]: With dead ends: 38 [2019-09-20 12:58:38,500 INFO L226 Difference]: Without dead ends: 28 [2019-09-20 12:58:38,502 INFO L636 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=72, Invalid=200, Unknown=0, NotChecked=0, Total=272 [2019-09-20 12:58:38,502 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2019-09-20 12:58:38,508 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 20. [2019-09-20 12:58:38,508 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2019-09-20 12:58:38,509 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2019-09-20 12:58:38,509 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 17 [2019-09-20 12:58:38,510 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-20 12:58:38,510 INFO L475 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2019-09-20 12:58:38,510 INFO L476 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-09-20 12:58:38,510 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2019-09-20 12:58:38,511 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2019-09-20 12:58:38,511 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 12:58:38,511 INFO L407 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 12:58:38,512 INFO L418 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 12:58:38,512 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 12:58:38,512 INFO L82 PathProgramCache]: Analyzing trace with hash 478895679, now seen corresponding path program 2 times [2019-09-20 12:58:38,513 INFO L224 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-20 12:58:38,513 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-20 12:58:38,514 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 12:58:38,515 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-20 12:58:38,515 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 12:58:38,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 12:58:38,634 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-20 12:58:38,635 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 12:58:38,635 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) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-20 12:58:38,674 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2019-09-20 12:58:38,692 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-09-20 12:58:38,693 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-20 12:58:38,693 INFO L256 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 5 conjunts are in the unsatisfiable core [2019-09-20 12:58:38,695 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-20 12:58:38,773 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-20 12:58:38,777 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-20 12:58:38,777 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 6] total 13 [2019-09-20 12:58:38,778 INFO L454 AbstractCegarLoop]: Interpolant automaton has 13 states [2019-09-20 12:58:38,778 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2019-09-20 12:58:38,779 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2019-09-20 12:58:38,779 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand 13 states. [2019-09-20 12:58:39,052 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-20 12:58:39,052 INFO L93 Difference]: Finished difference Result 44 states and 49 transitions. [2019-09-20 12:58:39,053 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-09-20 12:58:39,053 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 19 [2019-09-20 12:58:39,053 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-20 12:58:39,054 INFO L225 Difference]: With dead ends: 44 [2019-09-20 12:58:39,054 INFO L226 Difference]: Without dead ends: 32 [2019-09-20 12:58:39,055 INFO L636 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=109, Invalid=311, Unknown=0, NotChecked=0, Total=420 [2019-09-20 12:58:39,055 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2019-09-20 12:58:39,060 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 22. [2019-09-20 12:58:39,060 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2019-09-20 12:58:39,061 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 23 transitions. [2019-09-20 12:58:39,061 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 23 transitions. Word has length 19 [2019-09-20 12:58:39,061 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-20 12:58:39,062 INFO L475 AbstractCegarLoop]: Abstraction has 22 states and 23 transitions. [2019-09-20 12:58:39,062 INFO L476 AbstractCegarLoop]: Interpolant automaton has 13 states. [2019-09-20 12:58:39,062 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 23 transitions. [2019-09-20 12:58:39,063 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2019-09-20 12:58:39,063 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 12:58:39,063 INFO L407 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 12:58:39,063 INFO L418 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 12:58:39,063 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 12:58:39,064 INFO L82 PathProgramCache]: Analyzing trace with hash 815365117, now seen corresponding path program 3 times [2019-09-20 12:58:39,064 INFO L224 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-20 12:58:39,064 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-20 12:58:39,067 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 12:58:39,067 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-20 12:58:39,067 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 12:58:39,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 12:58:39,202 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-20 12:58:39,203 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 12:58:39,203 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) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-20 12:58:39,224 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-09-20 12:58:39,237 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2019-09-20 12:58:39,238 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-20 12:58:39,238 INFO L256 TraceCheckSpWp]: Trace formula consists of 42 conjuncts, 4 conjunts are in the unsatisfiable core [2019-09-20 12:58:39,240 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-20 12:58:39,278 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-09-20 12:58:39,282 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-20 12:58:39,282 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 5] total 12 [2019-09-20 12:58:39,283 INFO L454 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-09-20 12:58:39,283 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-09-20 12:58:39,284 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=101, Unknown=0, NotChecked=0, Total=132 [2019-09-20 12:58:39,284 INFO L87 Difference]: Start difference. First operand 22 states and 23 transitions. Second operand 12 states. [2019-09-20 12:58:39,540 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-20 12:58:39,540 INFO L93 Difference]: Finished difference Result 57 states and 63 transitions. [2019-09-20 12:58:39,541 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-09-20 12:58:39,541 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 21 [2019-09-20 12:58:39,541 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-20 12:58:39,542 INFO L225 Difference]: With dead ends: 57 [2019-09-20 12:58:39,542 INFO L226 Difference]: Without dead ends: 52 [2019-09-20 12:58:39,543 INFO L636 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=106, Invalid=274, Unknown=0, NotChecked=0, Total=380 [2019-09-20 12:58:39,543 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2019-09-20 12:58:39,550 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 31. [2019-09-20 12:58:39,550 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2019-09-20 12:58:39,551 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 33 transitions. [2019-09-20 12:58:39,551 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 33 transitions. Word has length 21 [2019-09-20 12:58:39,552 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-20 12:58:39,552 INFO L475 AbstractCegarLoop]: Abstraction has 31 states and 33 transitions. [2019-09-20 12:58:39,552 INFO L476 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-09-20 12:58:39,552 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 33 transitions. [2019-09-20 12:58:39,553 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2019-09-20 12:58:39,553 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 12:58:39,553 INFO L407 BasicCegarLoop]: trace histogram [6, 6, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 12:58:39,554 INFO L418 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 12:58:39,554 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 12:58:39,554 INFO L82 PathProgramCache]: Analyzing trace with hash -441049109, now seen corresponding path program 4 times [2019-09-20 12:58:39,554 INFO L224 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-20 12:58:39,555 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-20 12:58:39,556 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 12:58:39,556 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-20 12:58:39,557 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 12:58:39,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 12:58:39,839 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 0 proven. 47 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-20 12:58:39,840 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 12:58:39,840 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 [2019-09-20 12:58:39,868 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-09-20 12:58:39,886 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-09-20 12:58:39,887 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-20 12:58:39,888 INFO L256 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 6 conjunts are in the unsatisfiable core [2019-09-20 12:58:39,890 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-20 12:58:40,009 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 27 proven. 9 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2019-09-20 12:58:40,016 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-20 12:58:40,016 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 7] total 21 [2019-09-20 12:58:40,016 INFO L454 AbstractCegarLoop]: Interpolant automaton has 21 states [2019-09-20 12:58:40,017 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2019-09-20 12:58:40,017 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=357, Unknown=0, NotChecked=0, Total=420 [2019-09-20 12:58:40,017 INFO L87 Difference]: Start difference. First operand 31 states and 33 transitions. Second operand 21 states. [2019-09-20 12:58:40,409 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-20 12:58:40,410 INFO L93 Difference]: Finished difference Result 53 states and 58 transitions. [2019-09-20 12:58:40,410 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2019-09-20 12:58:40,410 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 30 [2019-09-20 12:58:40,411 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-20 12:58:40,411 INFO L225 Difference]: With dead ends: 53 [2019-09-20 12:58:40,412 INFO L226 Difference]: Without dead ends: 37 [2019-09-20 12:58:40,413 INFO L636 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 117 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=173, Invalid=757, Unknown=0, NotChecked=0, Total=930 [2019-09-20 12:58:40,413 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2019-09-20 12:58:40,418 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2019-09-20 12:58:40,419 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2019-09-20 12:58:40,420 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 37 transitions. [2019-09-20 12:58:40,420 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 37 transitions. Word has length 30 [2019-09-20 12:58:40,420 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-20 12:58:40,420 INFO L475 AbstractCegarLoop]: Abstraction has 35 states and 37 transitions. [2019-09-20 12:58:40,420 INFO L476 AbstractCegarLoop]: Interpolant automaton has 21 states. [2019-09-20 12:58:40,421 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 37 transitions. [2019-09-20 12:58:40,421 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2019-09-20 12:58:40,421 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 12:58:40,422 INFO L407 BasicCegarLoop]: trace histogram [8, 8, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 12:58:40,422 INFO L418 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 12:58:40,422 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 12:58:40,422 INFO L82 PathProgramCache]: Analyzing trace with hash -1891685973, now seen corresponding path program 5 times [2019-09-20 12:58:40,423 INFO L224 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-20 12:58:40,423 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-20 12:58:40,424 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 12:58:40,425 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-20 12:58:40,425 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 12:58:40,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 12:58:40,671 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-20 12:58:40,671 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 12:58:40,673 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) [2019-09-20 12:58:40,697 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-20 12:58:40,723 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 11 check-sat command(s) [2019-09-20 12:58:40,724 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-20 12:58:40,725 INFO L256 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 7 conjunts are in the unsatisfiable core [2019-09-20 12:58:40,727 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-20 12:58:40,877 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 43 proven. 16 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2019-09-20 12:58:40,881 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-20 12:58:40,881 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 8] total 24 [2019-09-20 12:58:40,881 INFO L454 AbstractCegarLoop]: Interpolant automaton has 24 states [2019-09-20 12:58:40,882 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2019-09-20 12:58:40,882 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=470, Unknown=0, NotChecked=0, Total=552 [2019-09-20 12:58:40,883 INFO L87 Difference]: Start difference. First operand 35 states and 37 transitions. Second operand 24 states. [2019-09-20 12:58:41,450 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-20 12:58:41,451 INFO L93 Difference]: Finished difference Result 59 states and 64 transitions. [2019-09-20 12:58:41,452 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2019-09-20 12:58:41,452 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 34 [2019-09-20 12:58:41,452 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-20 12:58:41,453 INFO L225 Difference]: With dead ends: 59 [2019-09-20 12:58:41,453 INFO L226 Difference]: Without dead ends: 41 [2019-09-20 12:58:41,454 INFO L636 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 172 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=232, Invalid=1028, Unknown=0, NotChecked=0, Total=1260 [2019-09-20 12:58:41,455 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2019-09-20 12:58:41,461 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 39. [2019-09-20 12:58:41,461 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2019-09-20 12:58:41,462 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 41 transitions. [2019-09-20 12:58:41,462 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 41 transitions. Word has length 34 [2019-09-20 12:58:41,463 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-20 12:58:41,463 INFO L475 AbstractCegarLoop]: Abstraction has 39 states and 41 transitions. [2019-09-20 12:58:41,463 INFO L476 AbstractCegarLoop]: Interpolant automaton has 24 states. [2019-09-20 12:58:41,463 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 41 transitions. [2019-09-20 12:58:41,464 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2019-09-20 12:58:41,464 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 12:58:41,464 INFO L407 BasicCegarLoop]: trace histogram [10, 10, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 12:58:41,465 INFO L418 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 12:58:41,465 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 12:58:41,465 INFO L82 PathProgramCache]: Analyzing trace with hash -98733461, now seen corresponding path program 6 times [2019-09-20 12:58:41,465 INFO L224 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-20 12:58:41,465 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-20 12:58:41,467 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 12:58:41,467 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-20 12:58:41,467 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 12:58:41,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 12:58:41,715 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 0 proven. 115 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-20 12:58:41,716 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 12:58:41,716 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) [2019-09-20 12:58:41,747 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-20 12:58:41,764 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2019-09-20 12:58:41,764 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-20 12:58:41,765 INFO L256 TraceCheckSpWp]: Trace formula consists of 48 conjuncts, 5 conjunts are in the unsatisfiable core [2019-09-20 12:58:41,767 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-20 12:58:41,850 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 0 proven. 65 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [MP z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (7)] Exception during sending of exit command (exit): Stream closed [2019-09-20 12:58:41,854 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-20 12:58:41,854 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 6] total 23 [2019-09-20 12:58:41,855 INFO L454 AbstractCegarLoop]: Interpolant automaton has 23 states [2019-09-20 12:58:41,855 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2019-09-20 12:58:41,856 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=425, Unknown=0, NotChecked=0, Total=506 [2019-09-20 12:58:41,856 INFO L87 Difference]: Start difference. First operand 39 states and 41 transitions. Second operand 23 states. [2019-09-20 12:58:42,821 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-20 12:58:42,821 INFO L93 Difference]: Finished difference Result 103 states and 112 transitions. [2019-09-20 12:58:42,822 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2019-09-20 12:58:42,822 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 38 [2019-09-20 12:58:42,822 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-20 12:58:42,823 INFO L225 Difference]: With dead ends: 103 [2019-09-20 12:58:42,823 INFO L226 Difference]: Without dead ends: 98 [2019-09-20 12:58:42,825 INFO L636 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 389 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=417, Invalid=1839, Unknown=0, NotChecked=0, Total=2256 [2019-09-20 12:58:42,825 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2019-09-20 12:58:42,835 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 52. [2019-09-20 12:58:42,835 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2019-09-20 12:58:42,836 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 55 transitions. [2019-09-20 12:58:42,836 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 55 transitions. Word has length 38 [2019-09-20 12:58:42,837 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-20 12:58:42,837 INFO L475 AbstractCegarLoop]: Abstraction has 52 states and 55 transitions. [2019-09-20 12:58:42,837 INFO L476 AbstractCegarLoop]: Interpolant automaton has 23 states. [2019-09-20 12:58:42,837 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 55 transitions. [2019-09-20 12:58:42,838 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2019-09-20 12:58:42,839 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 12:58:42,839 INFO L407 BasicCegarLoop]: trace histogram [15, 15, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 12:58:42,839 INFO L418 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 12:58:42,839 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 12:58:42,840 INFO L82 PathProgramCache]: Analyzing trace with hash 2002360889, now seen corresponding path program 7 times [2019-09-20 12:58:42,840 INFO L224 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-20 12:58:42,840 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-20 12:58:42,841 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 12:58:42,841 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-20 12:58:42,841 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 12:58:42,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 12:58:43,316 INFO L134 CoverageAnalysis]: Checked inductivity of 267 backedges. 0 proven. 267 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-20 12:58:43,316 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 12:58:43,317 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 [2019-09-20 12:58:43,347 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-20 12:58:43,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 12:58:43,380 INFO L256 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 8 conjunts are in the unsatisfiable core [2019-09-20 12:58:43,383 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-20 12:58:43,670 INFO L134 CoverageAnalysis]: Checked inductivity of 267 backedges. 125 proven. 25 refuted. 0 times theorem prover too weak. 117 trivial. 0 not checked. [MP z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (8)] Exception during sending of exit command (exit): Broken pipe [2019-09-20 12:58:43,674 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-20 12:58:43,674 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 9] total 35 [2019-09-20 12:58:43,675 INFO L454 AbstractCegarLoop]: Interpolant automaton has 35 states [2019-09-20 12:58:43,675 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2019-09-20 12:58:43,676 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=1054, Unknown=0, NotChecked=0, Total=1190 [2019-09-20 12:58:43,676 INFO L87 Difference]: Start difference. First operand 52 states and 55 transitions. Second operand 35 states. [2019-09-20 12:58:44,471 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-20 12:58:44,471 INFO L93 Difference]: Finished difference Result 94 states and 102 transitions. [2019-09-20 12:58:44,475 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-09-20 12:58:44,475 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 51 [2019-09-20 12:58:44,476 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-20 12:58:44,476 INFO L225 Difference]: With dead ends: 94 [2019-09-20 12:58:44,476 INFO L226 Difference]: Without dead ends: 61 [2019-09-20 12:58:44,480 INFO L636 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 385 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=332, Invalid=2020, Unknown=0, NotChecked=0, Total=2352 [2019-09-20 12:58:44,481 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2019-09-20 12:58:44,493 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 58. [2019-09-20 12:58:44,493 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2019-09-20 12:58:44,494 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 61 transitions. [2019-09-20 12:58:44,494 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 61 transitions. Word has length 51 [2019-09-20 12:58:44,495 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-20 12:58:44,495 INFO L475 AbstractCegarLoop]: Abstraction has 58 states and 61 transitions. [2019-09-20 12:58:44,495 INFO L476 AbstractCegarLoop]: Interpolant automaton has 35 states. [2019-09-20 12:58:44,495 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 61 transitions. [2019-09-20 12:58:44,502 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2019-09-20 12:58:44,502 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 12:58:44,502 INFO L407 BasicCegarLoop]: trace histogram [18, 18, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 12:58:44,502 INFO L418 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 12:58:44,503 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 12:58:44,503 INFO L82 PathProgramCache]: Analyzing trace with hash 2127028663, now seen corresponding path program 8 times [2019-09-20 12:58:44,503 INFO L224 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-20 12:58:44,504 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-20 12:58:44,506 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 12:58:44,506 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-20 12:58:44,506 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 12:58:44,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 12:58:45,033 INFO L134 CoverageAnalysis]: Checked inductivity of 372 backedges. 0 proven. 372 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-20 12:58:45,033 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 12:58:45,033 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 [2019-09-20 12:58:45,059 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2019-09-20 12:58:45,095 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-09-20 12:58:45,096 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-20 12:58:45,096 INFO L256 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 9 conjunts are in the unsatisfiable core [2019-09-20 12:58:45,099 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-20 12:58:45,366 INFO L134 CoverageAnalysis]: Checked inductivity of 372 backedges. 173 proven. 36 refuted. 0 times theorem prover too weak. 163 trivial. 0 not checked. [2019-09-20 12:58:45,369 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-20 12:58:45,370 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 10] total 39 [2019-09-20 12:58:45,370 INFO L454 AbstractCegarLoop]: Interpolant automaton has 39 states [2019-09-20 12:58:45,371 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2019-09-20 12:58:45,372 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=169, Invalid=1313, Unknown=0, NotChecked=0, Total=1482 [2019-09-20 12:58:45,372 INFO L87 Difference]: Start difference. First operand 58 states and 61 transitions. Second operand 39 states. [2019-09-20 12:58:46,267 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-20 12:58:46,267 INFO L93 Difference]: Finished difference Result 104 states and 112 transitions. [2019-09-20 12:58:46,269 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2019-09-20 12:58:46,269 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 57 [2019-09-20 12:58:46,269 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-20 12:58:46,269 INFO L225 Difference]: With dead ends: 104 [2019-09-20 12:58:46,270 INFO L226 Difference]: Without dead ends: 67 [2019-09-20 12:58:46,271 INFO L636 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 506 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=418, Invalid=2552, Unknown=0, NotChecked=0, Total=2970 [2019-09-20 12:58:46,271 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2019-09-20 12:58:46,282 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 64. [2019-09-20 12:58:46,282 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2019-09-20 12:58:46,283 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 67 transitions. [2019-09-20 12:58:46,283 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 67 transitions. Word has length 57 [2019-09-20 12:58:46,283 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-20 12:58:46,283 INFO L475 AbstractCegarLoop]: Abstraction has 64 states and 67 transitions. [2019-09-20 12:58:46,284 INFO L476 AbstractCegarLoop]: Interpolant automaton has 39 states. [2019-09-20 12:58:46,284 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 67 transitions. [2019-09-20 12:58:46,285 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2019-09-20 12:58:46,285 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 12:58:46,285 INFO L407 BasicCegarLoop]: trace histogram [21, 21, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 12:58:46,285 INFO L418 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 12:58:46,285 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 12:58:46,286 INFO L82 PathProgramCache]: Analyzing trace with hash -1542827339, now seen corresponding path program 9 times [2019-09-20 12:58:46,286 INFO L224 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-20 12:58:46,286 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-20 12:58:46,287 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 12:58:46,287 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-20 12:58:46,287 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 12:58:46,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 12:58:46,942 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-20 12:58:46,942 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 12:58:46,943 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 [2019-09-20 12:58:46,970 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-09-20 12:58:47,009 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 17 check-sat command(s) [2019-09-20 12:58:47,009 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-20 12:58:47,010 INFO L256 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 10 conjunts are in the unsatisfiable core [2019-09-20 12:58:47,013 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-20 12:58:47,319 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 231 proven. 49 refuted. 0 times theorem prover too weak. 215 trivial. 0 not checked. [2019-09-20 12:58:47,323 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-20 12:58:47,323 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 11] total 43 [2019-09-20 12:58:47,324 INFO L454 AbstractCegarLoop]: Interpolant automaton has 43 states [2019-09-20 12:58:47,324 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2019-09-20 12:58:47,325 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=206, Invalid=1600, Unknown=0, NotChecked=0, Total=1806 [2019-09-20 12:58:47,325 INFO L87 Difference]: Start difference. First operand 64 states and 67 transitions. Second operand 43 states. [2019-09-20 12:58:48,327 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-20 12:58:48,327 INFO L93 Difference]: Finished difference Result 114 states and 122 transitions. [2019-09-20 12:58:48,331 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2019-09-20 12:58:48,331 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 63 [2019-09-20 12:58:48,332 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-20 12:58:48,332 INFO L225 Difference]: With dead ends: 114 [2019-09-20 12:58:48,332 INFO L226 Difference]: Without dead ends: 73 [2019-09-20 12:58:48,334 INFO L636 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 55 SyntacticMatches, 0 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 643 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=518, Invalid=3142, Unknown=0, NotChecked=0, Total=3660 [2019-09-20 12:58:48,334 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2019-09-20 12:58:48,344 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 70. [2019-09-20 12:58:48,344 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2019-09-20 12:58:48,345 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 73 transitions. [2019-09-20 12:58:48,345 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 73 transitions. Word has length 63 [2019-09-20 12:58:48,345 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-20 12:58:48,345 INFO L475 AbstractCegarLoop]: Abstraction has 70 states and 73 transitions. [2019-09-20 12:58:48,346 INFO L476 AbstractCegarLoop]: Interpolant automaton has 43 states. [2019-09-20 12:58:48,346 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 73 transitions. [2019-09-20 12:58:48,346 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2019-09-20 12:58:48,347 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 12:58:48,347 INFO L407 BasicCegarLoop]: trace histogram [24, 24, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 12:58:48,347 INFO L418 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 12:58:48,347 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 12:58:48,347 INFO L82 PathProgramCache]: Analyzing trace with hash -1910289101, now seen corresponding path program 10 times [2019-09-20 12:58:48,348 INFO L224 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-20 12:58:48,348 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-20 12:58:48,349 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 12:58:48,349 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-20 12:58:48,349 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 12:58:48,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 12:58:49,119 INFO L134 CoverageAnalysis]: Checked inductivity of 636 backedges. 0 proven. 636 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-20 12:58:49,119 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 12:58:49,119 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 [2019-09-20 12:58:49,162 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-09-20 12:58:49,192 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-09-20 12:58:49,193 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-20 12:58:49,194 INFO L256 TraceCheckSpWp]: Trace formula consists of 174 conjuncts, 11 conjunts are in the unsatisfiable core [2019-09-20 12:58:49,197 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-20 12:58:49,603 INFO L134 CoverageAnalysis]: Checked inductivity of 636 backedges. 293 proven. 64 refuted. 0 times theorem prover too weak. 279 trivial. 0 not checked. [MP z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (11)] Exception during sending of exit command (exit): Broken pipe [2019-09-20 12:58:49,612 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-20 12:58:49,612 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 12] total 47 [2019-09-20 12:58:49,613 INFO L454 AbstractCegarLoop]: Interpolant automaton has 47 states [2019-09-20 12:58:49,613 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2019-09-20 12:58:49,614 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=247, Invalid=1915, Unknown=0, NotChecked=0, Total=2162 [2019-09-20 12:58:49,616 INFO L87 Difference]: Start difference. First operand 70 states and 73 transitions. Second operand 47 states. [2019-09-20 12:58:50,950 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-20 12:58:50,950 INFO L93 Difference]: Finished difference Result 124 states and 132 transitions. [2019-09-20 12:58:50,951 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2019-09-20 12:58:50,951 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 69 [2019-09-20 12:58:50,951 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-20 12:58:50,952 INFO L225 Difference]: With dead ends: 124 [2019-09-20 12:58:50,952 INFO L226 Difference]: Without dead ends: 79 [2019-09-20 12:58:50,954 INFO L636 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 60 SyntacticMatches, 0 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 796 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=633, Invalid=3789, Unknown=0, NotChecked=0, Total=4422 [2019-09-20 12:58:50,955 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2019-09-20 12:58:50,964 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 76. [2019-09-20 12:58:50,964 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2019-09-20 12:58:50,965 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 79 transitions. [2019-09-20 12:58:50,965 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 79 transitions. Word has length 69 [2019-09-20 12:58:50,965 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-20 12:58:50,966 INFO L475 AbstractCegarLoop]: Abstraction has 76 states and 79 transitions. [2019-09-20 12:58:50,966 INFO L476 AbstractCegarLoop]: Interpolant automaton has 47 states. [2019-09-20 12:58:50,966 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 79 transitions. [2019-09-20 12:58:50,967 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2019-09-20 12:58:50,967 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 12:58:50,967 INFO L407 BasicCegarLoop]: trace histogram [27, 27, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 12:58:50,967 INFO L418 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 12:58:50,967 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 12:58:50,968 INFO L82 PathProgramCache]: Analyzing trace with hash -1389547215, now seen corresponding path program 11 times [2019-09-20 12:58:50,968 INFO L224 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-20 12:58:50,968 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-20 12:58:50,969 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 12:58:50,969 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-20 12:58:50,969 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 12:58:50,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 12:58:51,895 INFO L134 CoverageAnalysis]: Checked inductivity of 795 backedges. 0 proven. 795 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-20 12:58:51,896 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 12:58:51,896 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 [2019-09-20 12:58:51,938 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2019-09-20 12:58:51,991 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 31 check-sat command(s) [2019-09-20 12:58:51,991 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-20 12:58:51,992 INFO L256 TraceCheckSpWp]: Trace formula consists of 189 conjuncts, 12 conjunts are in the unsatisfiable core [2019-09-20 12:58:51,994 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-20 12:58:52,449 INFO L134 CoverageAnalysis]: Checked inductivity of 795 backedges. 549 proven. 81 refuted. 0 times theorem prover too weak. 165 trivial. 0 not checked. [2019-09-20 12:58:52,453 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-20 12:58:52,453 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 13] total 51 [2019-09-20 12:58:52,453 INFO L454 AbstractCegarLoop]: Interpolant automaton has 51 states [2019-09-20 12:58:52,454 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2019-09-20 12:58:52,454 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=292, Invalid=2258, Unknown=0, NotChecked=0, Total=2550 [2019-09-20 12:58:52,455 INFO L87 Difference]: Start difference. First operand 76 states and 79 transitions. Second operand 51 states. [2019-09-20 12:58:54,009 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-20 12:58:54,009 INFO L93 Difference]: Finished difference Result 134 states and 142 transitions. [2019-09-20 12:58:54,010 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2019-09-20 12:58:54,010 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 75 [2019-09-20 12:58:54,010 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-20 12:58:54,011 INFO L225 Difference]: With dead ends: 134 [2019-09-20 12:58:54,011 INFO L226 Difference]: Without dead ends: 85 [2019-09-20 12:58:54,013 INFO L636 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 65 SyntacticMatches, 0 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 987 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=901, Invalid=4501, Unknown=0, NotChecked=0, Total=5402 [2019-09-20 12:58:54,013 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2019-09-20 12:58:54,022 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 82. [2019-09-20 12:58:54,022 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2019-09-20 12:58:54,023 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 85 transitions. [2019-09-20 12:58:54,023 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 85 transitions. Word has length 75 [2019-09-20 12:58:54,023 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-20 12:58:54,023 INFO L475 AbstractCegarLoop]: Abstraction has 82 states and 85 transitions. [2019-09-20 12:58:54,023 INFO L476 AbstractCegarLoop]: Interpolant automaton has 51 states. [2019-09-20 12:58:54,023 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 85 transitions. [2019-09-20 12:58:54,024 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2019-09-20 12:58:54,024 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 12:58:54,024 INFO L407 BasicCegarLoop]: trace histogram [30, 30, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 12:58:54,024 INFO L418 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 12:58:54,025 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 12:58:54,025 INFO L82 PathProgramCache]: Analyzing trace with hash 1348099759, now seen corresponding path program 12 times [2019-09-20 12:58:54,025 INFO L224 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-20 12:58:54,025 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-20 12:58:54,026 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 12:58:54,026 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-20 12:58:54,027 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 12:58:54,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 12:58:54,097 INFO L134 CoverageAnalysis]: Checked inductivity of 972 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 300 trivial. 0 not checked. [2019-09-20 12:58:54,098 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 12:58:54,098 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 [2019-09-20 12:58:54,151 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2019-09-20 12:58:54,216 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 24 check-sat command(s) [2019-09-20 12:58:54,217 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-20 12:58:54,218 INFO L256 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 6 conjunts are in the unsatisfiable core [2019-09-20 12:58:54,221 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-20 12:58:54,291 INFO L134 CoverageAnalysis]: Checked inductivity of 972 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 300 trivial. 0 not checked. [MP z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (13)] Exception during sending of exit command (exit): Broken pipe [2019-09-20 12:58:54,294 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-20 12:58:54,295 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 11 [2019-09-20 12:58:54,295 INFO L454 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-09-20 12:58:54,295 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-09-20 12:58:54,296 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=65, Unknown=0, NotChecked=0, Total=110 [2019-09-20 12:58:54,296 INFO L87 Difference]: Start difference. First operand 82 states and 85 transitions. Second operand 11 states. [2019-09-20 12:58:54,340 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-20 12:58:54,340 INFO L93 Difference]: Finished difference Result 132 states and 137 transitions. [2019-09-20 12:58:54,341 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-09-20 12:58:54,341 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 81 [2019-09-20 12:58:54,341 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-20 12:58:54,342 INFO L225 Difference]: With dead ends: 132 [2019-09-20 12:58:54,342 INFO L226 Difference]: Without dead ends: 127 [2019-09-20 12:58:54,343 INFO L636 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 78 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=45, Invalid=65, Unknown=0, NotChecked=0, Total=110 [2019-09-20 12:58:54,343 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2019-09-20 12:58:54,354 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 105. [2019-09-20 12:58:54,354 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2019-09-20 12:58:54,355 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 109 transitions. [2019-09-20 12:58:54,355 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 109 transitions. Word has length 81 [2019-09-20 12:58:54,355 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-20 12:58:54,355 INFO L475 AbstractCegarLoop]: Abstraction has 105 states and 109 transitions. [2019-09-20 12:58:54,355 INFO L476 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-09-20 12:58:54,356 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 109 transitions. [2019-09-20 12:58:54,356 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2019-09-20 12:58:54,357 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 12:58:54,357 INFO L407 BasicCegarLoop]: trace histogram [40, 40, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 12:58:54,357 INFO L418 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 12:58:54,357 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 12:58:54,357 INFO L82 PathProgramCache]: Analyzing trace with hash -1467049301, now seen corresponding path program 13 times [2019-09-20 12:58:54,358 INFO L224 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-20 12:58:54,358 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-20 12:58:54,359 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 12:58:54,359 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-20 12:58:54,359 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 12:58:54,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 12:58:54,467 INFO L134 CoverageAnalysis]: Checked inductivity of 1742 backedges. 0 proven. 1342 refuted. 0 times theorem prover too weak. 400 trivial. 0 not checked. [2019-09-20 12:58:54,467 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 12:58:54,467 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 [2019-09-20 12:58:54,517 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-20 12:58:54,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 12:58:54,566 INFO L256 TraceCheckSpWp]: Trace formula consists of 260 conjuncts, 7 conjunts are in the unsatisfiable core [2019-09-20 12:58:54,568 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-20 12:58:54,647 INFO L134 CoverageAnalysis]: Checked inductivity of 1742 backedges. 0 proven. 1342 refuted. 0 times theorem prover too weak. 400 trivial. 0 not checked. [MP z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (14)] Exception during sending of exit command (exit): Stream closed [2019-09-20 12:58:54,651 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-20 12:58:54,651 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 13 [2019-09-20 12:58:54,652 INFO L454 AbstractCegarLoop]: Interpolant automaton has 13 states [2019-09-20 12:58:54,652 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2019-09-20 12:58:54,652 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=93, Unknown=0, NotChecked=0, Total=156 [2019-09-20 12:58:54,652 INFO L87 Difference]: Start difference. First operand 105 states and 109 transitions. Second operand 13 states. [2019-09-20 12:58:54,705 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-20 12:58:54,705 INFO L93 Difference]: Finished difference Result 155 states and 161 transitions. [2019-09-20 12:58:54,706 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-09-20 12:58:54,706 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 104 [2019-09-20 12:58:54,706 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-20 12:58:54,707 INFO L225 Difference]: With dead ends: 155 [2019-09-20 12:58:54,707 INFO L226 Difference]: Without dead ends: 150 [2019-09-20 12:58:54,708 INFO L636 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 100 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=63, Invalid=93, Unknown=0, NotChecked=0, Total=156 [2019-09-20 12:58:54,708 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2019-09-20 12:58:54,719 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 128. [2019-09-20 12:58:54,719 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 128 states. [2019-09-20 12:58:54,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 133 transitions. [2019-09-20 12:58:54,721 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 133 transitions. Word has length 104 [2019-09-20 12:58:54,721 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-20 12:58:54,721 INFO L475 AbstractCegarLoop]: Abstraction has 128 states and 133 transitions. [2019-09-20 12:58:54,721 INFO L476 AbstractCegarLoop]: Interpolant automaton has 13 states. [2019-09-20 12:58:54,721 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 133 transitions. [2019-09-20 12:58:54,722 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2019-09-20 12:58:54,723 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 12:58:54,723 INFO L407 BasicCegarLoop]: trace histogram [50, 50, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 12:58:54,723 INFO L418 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 12:58:54,723 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 12:58:54,723 INFO L82 PathProgramCache]: Analyzing trace with hash -1018125521, now seen corresponding path program 14 times [2019-09-20 12:58:54,724 INFO L224 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-20 12:58:54,724 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-20 12:58:54,725 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 12:58:54,725 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-20 12:58:54,725 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 12:58:54,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 12:58:54,867 INFO L134 CoverageAnalysis]: Checked inductivity of 2735 backedges. 0 proven. 2235 refuted. 0 times theorem prover too weak. 500 trivial. 0 not checked. [2019-09-20 12:58:54,868 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 12:58:54,868 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 [2019-09-20 12:58:54,907 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2019-09-20 12:58:54,966 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-09-20 12:58:54,966 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-20 12:58:54,967 INFO L256 TraceCheckSpWp]: Trace formula consists of 316 conjuncts, 8 conjunts are in the unsatisfiable core [2019-09-20 12:58:54,968 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-20 12:58:55,071 INFO L134 CoverageAnalysis]: Checked inductivity of 2735 backedges. 0 proven. 2235 refuted. 0 times theorem prover too weak. 500 trivial. 0 not checked. [2019-09-20 12:58:55,082 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-20 12:58:55,083 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 15 [2019-09-20 12:58:55,083 INFO L454 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-09-20 12:58:55,083 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-09-20 12:58:55,084 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=126, Unknown=0, NotChecked=0, Total=210 [2019-09-20 12:58:55,084 INFO L87 Difference]: Start difference. First operand 128 states and 133 transitions. Second operand 15 states. [2019-09-20 12:58:55,138 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-20 12:58:55,138 INFO L93 Difference]: Finished difference Result 178 states and 185 transitions. [2019-09-20 12:58:55,138 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-09-20 12:58:55,139 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 127 [2019-09-20 12:58:55,139 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-20 12:58:55,140 INFO L225 Difference]: With dead ends: 178 [2019-09-20 12:58:55,140 INFO L226 Difference]: Without dead ends: 173 [2019-09-20 12:58:55,140 INFO L636 BasicCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 122 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 60 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=84, Invalid=126, Unknown=0, NotChecked=0, Total=210 [2019-09-20 12:58:55,141 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 173 states. [2019-09-20 12:58:55,151 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 173 to 151. [2019-09-20 12:58:55,151 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 151 states. [2019-09-20 12:58:55,152 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 151 states to 151 states and 157 transitions. [2019-09-20 12:58:55,152 INFO L78 Accepts]: Start accepts. Automaton has 151 states and 157 transitions. Word has length 127 [2019-09-20 12:58:55,153 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-20 12:58:55,153 INFO L475 AbstractCegarLoop]: Abstraction has 151 states and 157 transitions. [2019-09-20 12:58:55,153 INFO L476 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-09-20 12:58:55,153 INFO L276 IsEmpty]: Start isEmpty. Operand 151 states and 157 transitions. [2019-09-20 12:58:55,154 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 151 [2019-09-20 12:58:55,155 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 12:58:55,155 INFO L407 BasicCegarLoop]: trace histogram [60, 60, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 12:58:55,155 INFO L418 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 12:58:55,155 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 12:58:55,155 INFO L82 PathProgramCache]: Analyzing trace with hash -1416411605, now seen corresponding path program 15 times [2019-09-20 12:58:55,156 INFO L224 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-20 12:58:55,156 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-20 12:58:55,157 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 12:58:55,157 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-20 12:58:55,157 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 12:58:55,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 12:58:55,341 INFO L134 CoverageAnalysis]: Checked inductivity of 3951 backedges. 0 proven. 3351 refuted. 0 times theorem prover too weak. 600 trivial. 0 not checked. [2019-09-20 12:58:55,342 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 12:58:55,342 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) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-20 12:58:55,384 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-09-20 12:58:55,511 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 47 check-sat command(s) [2019-09-20 12:58:55,511 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-20 12:58:55,513 INFO L256 TraceCheckSpWp]: Trace formula consists of 322 conjuncts, 9 conjunts are in the unsatisfiable core [2019-09-20 12:58:55,517 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-20 12:58:55,656 INFO L134 CoverageAnalysis]: Checked inductivity of 3951 backedges. 0 proven. 3351 refuted. 0 times theorem prover too weak. 600 trivial. 0 not checked. [MP z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (16)] Exception during sending of exit command (exit): Broken pipe [2019-09-20 12:58:55,669 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-20 12:58:55,670 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 17 [2019-09-20 12:58:55,670 INFO L454 AbstractCegarLoop]: Interpolant automaton has 17 states [2019-09-20 12:58:55,671 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2019-09-20 12:58:55,671 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=164, Unknown=0, NotChecked=0, Total=272 [2019-09-20 12:58:55,671 INFO L87 Difference]: Start difference. First operand 151 states and 157 transitions. Second operand 17 states. [2019-09-20 12:58:55,718 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-20 12:58:55,718 INFO L93 Difference]: Finished difference Result 201 states and 209 transitions. [2019-09-20 12:58:55,719 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-09-20 12:58:55,719 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 150 [2019-09-20 12:58:55,719 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-20 12:58:55,720 INFO L225 Difference]: With dead ends: 201 [2019-09-20 12:58:55,720 INFO L226 Difference]: Without dead ends: 196 [2019-09-20 12:58:55,721 INFO L636 BasicCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 144 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 84 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=108, Invalid=164, Unknown=0, NotChecked=0, Total=272 [2019-09-20 12:58:55,721 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2019-09-20 12:58:55,734 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 174. [2019-09-20 12:58:55,735 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 174 states. [2019-09-20 12:58:55,736 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 181 transitions. [2019-09-20 12:58:55,736 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 181 transitions. Word has length 150 [2019-09-20 12:58:55,736 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-20 12:58:55,736 INFO L475 AbstractCegarLoop]: Abstraction has 174 states and 181 transitions. [2019-09-20 12:58:55,736 INFO L476 AbstractCegarLoop]: Interpolant automaton has 17 states. [2019-09-20 12:58:55,737 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 181 transitions. [2019-09-20 12:58:55,738 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 174 [2019-09-20 12:58:55,738 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 12:58:55,738 INFO L407 BasicCegarLoop]: trace histogram [70, 70, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 12:58:55,739 INFO L418 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 12:58:55,739 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 12:58:55,739 INFO L82 PathProgramCache]: Analyzing trace with hash -1492973649, now seen corresponding path program 16 times [2019-09-20 12:58:55,739 INFO L224 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-20 12:58:55,739 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-20 12:58:55,740 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 12:58:55,740 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-20 12:58:55,741 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 12:58:55,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 12:58:55,915 INFO L134 CoverageAnalysis]: Checked inductivity of 5390 backedges. 0 proven. 4690 refuted. 0 times theorem prover too weak. 700 trivial. 0 not checked. [2019-09-20 12:58:55,916 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 12:58:55,916 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 [2019-09-20 12:58:55,962 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-09-20 12:58:56,036 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-09-20 12:58:56,036 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-20 12:58:56,038 INFO L256 TraceCheckSpWp]: Trace formula consists of 428 conjuncts, 10 conjunts are in the unsatisfiable core [2019-09-20 12:58:56,041 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-20 12:58:56,203 INFO L134 CoverageAnalysis]: Checked inductivity of 5390 backedges. 0 proven. 4690 refuted. 0 times theorem prover too weak. 700 trivial. 0 not checked. [2019-09-20 12:58:56,206 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-20 12:58:56,206 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 19 [2019-09-20 12:58:56,207 INFO L454 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-09-20 12:58:56,207 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-09-20 12:58:56,207 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=207, Unknown=0, NotChecked=0, Total=342 [2019-09-20 12:58:56,207 INFO L87 Difference]: Start difference. First operand 174 states and 181 transitions. Second operand 19 states. [2019-09-20 12:58:56,288 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-20 12:58:56,288 INFO L93 Difference]: Finished difference Result 224 states and 233 transitions. [2019-09-20 12:58:56,288 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-09-20 12:58:56,288 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 173 [2019-09-20 12:58:56,289 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-20 12:58:56,290 INFO L225 Difference]: With dead ends: 224 [2019-09-20 12:58:56,290 INFO L226 Difference]: Without dead ends: 219 [2019-09-20 12:58:56,291 INFO L636 BasicCegarLoop]: 0 DeclaredPredicates, 183 GetRequests, 166 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 112 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=135, Invalid=207, Unknown=0, NotChecked=0, Total=342 [2019-09-20 12:58:56,291 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 219 states. [2019-09-20 12:58:56,306 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 219 to 197. [2019-09-20 12:58:56,307 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 197 states. [2019-09-20 12:58:56,308 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 197 states to 197 states and 205 transitions. [2019-09-20 12:58:56,308 INFO L78 Accepts]: Start accepts. Automaton has 197 states and 205 transitions. Word has length 173 [2019-09-20 12:58:56,308 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-20 12:58:56,308 INFO L475 AbstractCegarLoop]: Abstraction has 197 states and 205 transitions. [2019-09-20 12:58:56,309 INFO L476 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-09-20 12:58:56,309 INFO L276 IsEmpty]: Start isEmpty. Operand 197 states and 205 transitions. [2019-09-20 12:58:56,310 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 197 [2019-09-20 12:58:56,310 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 12:58:56,311 INFO L407 BasicCegarLoop]: trace histogram [80, 80, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 12:58:56,311 INFO L418 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 12:58:56,311 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 12:58:56,311 INFO L82 PathProgramCache]: Analyzing trace with hash 1547162027, now seen corresponding path program 17 times [2019-09-20 12:58:56,311 INFO L224 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-20 12:58:56,312 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-20 12:58:56,313 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 12:58:56,313 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-20 12:58:56,313 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 12:58:56,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 12:58:56,517 INFO L134 CoverageAnalysis]: Checked inductivity of 7052 backedges. 0 proven. 6252 refuted. 0 times theorem prover too weak. 800 trivial. 0 not checked. [2019-09-20 12:58:56,517 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 12:58:56,517 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 [2019-09-20 12:58:56,561 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2019-09-20 12:58:56,737 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 69 check-sat command(s) [2019-09-20 12:58:56,737 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-20 12:58:56,739 INFO L256 TraceCheckSpWp]: Trace formula consists of 484 conjuncts, 11 conjunts are in the unsatisfiable core [2019-09-20 12:58:56,742 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-20 12:58:56,922 INFO L134 CoverageAnalysis]: Checked inductivity of 7052 backedges. 0 proven. 6252 refuted. 0 times theorem prover too weak. 800 trivial. 0 not checked. [2019-09-20 12:58:56,926 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-20 12:58:56,927 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 21 [2019-09-20 12:58:56,927 INFO L454 AbstractCegarLoop]: Interpolant automaton has 21 states [2019-09-20 12:58:56,927 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2019-09-20 12:58:56,928 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=165, Invalid=255, Unknown=0, NotChecked=0, Total=420 [2019-09-20 12:58:56,928 INFO L87 Difference]: Start difference. First operand 197 states and 205 transitions. Second operand 21 states. [2019-09-20 12:58:56,998 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-20 12:58:56,998 INFO L93 Difference]: Finished difference Result 247 states and 257 transitions. [2019-09-20 12:58:56,998 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-09-20 12:58:56,998 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 196 [2019-09-20 12:58:56,999 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-20 12:58:57,000 INFO L225 Difference]: With dead ends: 247 [2019-09-20 12:58:57,000 INFO L226 Difference]: Without dead ends: 242 [2019-09-20 12:58:57,001 INFO L636 BasicCegarLoop]: 0 DeclaredPredicates, 207 GetRequests, 188 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 144 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=165, Invalid=255, Unknown=0, NotChecked=0, Total=420 [2019-09-20 12:58:57,001 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 242 states. [2019-09-20 12:58:57,019 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 242 to 220. [2019-09-20 12:58:57,019 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 220 states. [2019-09-20 12:58:57,020 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 220 states to 220 states and 229 transitions. [2019-09-20 12:58:57,020 INFO L78 Accepts]: Start accepts. Automaton has 220 states and 229 transitions. Word has length 196 [2019-09-20 12:58:57,021 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-20 12:58:57,021 INFO L475 AbstractCegarLoop]: Abstraction has 220 states and 229 transitions. [2019-09-20 12:58:57,021 INFO L476 AbstractCegarLoop]: Interpolant automaton has 21 states. [2019-09-20 12:58:57,021 INFO L276 IsEmpty]: Start isEmpty. Operand 220 states and 229 transitions. [2019-09-20 12:58:57,023 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 220 [2019-09-20 12:58:57,023 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 12:58:57,023 INFO L407 BasicCegarLoop]: trace histogram [90, 90, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 12:58:57,024 INFO L418 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 12:58:57,024 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 12:58:57,024 INFO L82 PathProgramCache]: Analyzing trace with hash 1463389231, now seen corresponding path program 18 times [2019-09-20 12:58:57,024 INFO L224 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-20 12:58:57,024 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-20 12:58:57,025 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 12:58:57,025 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-20 12:58:57,026 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 12:58:57,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 12:58:57,293 INFO L134 CoverageAnalysis]: Checked inductivity of 8937 backedges. 0 proven. 8037 refuted. 0 times theorem prover too weak. 900 trivial. 0 not checked. [2019-09-20 12:58:57,294 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 12:58:57,294 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 [2019-09-20 12:58:57,336 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2019-09-20 12:58:57,489 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 70 check-sat command(s) [2019-09-20 12:58:57,489 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-20 12:58:57,491 INFO L256 TraceCheckSpWp]: Trace formula consists of 490 conjuncts, 12 conjunts are in the unsatisfiable core [2019-09-20 12:58:57,498 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-20 12:58:57,793 INFO L134 CoverageAnalysis]: Checked inductivity of 8937 backedges. 0 proven. 8037 refuted. 0 times theorem prover too weak. 900 trivial. 0 not checked. [2019-09-20 12:58:57,798 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-20 12:58:57,798 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 23 [2019-09-20 12:58:57,799 INFO L454 AbstractCegarLoop]: Interpolant automaton has 23 states [2019-09-20 12:58:57,799 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2019-09-20 12:58:57,800 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=198, Invalid=308, Unknown=0, NotChecked=0, Total=506 [2019-09-20 12:58:57,800 INFO L87 Difference]: Start difference. First operand 220 states and 229 transitions. Second operand 23 states. [2019-09-20 12:58:57,931 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-20 12:58:57,932 INFO L93 Difference]: Finished difference Result 270 states and 281 transitions. [2019-09-20 12:58:57,932 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-09-20 12:58:57,932 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 219 [2019-09-20 12:58:57,933 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-20 12:58:57,934 INFO L225 Difference]: With dead ends: 270 [2019-09-20 12:58:57,934 INFO L226 Difference]: Without dead ends: 265 [2019-09-20 12:58:57,935 INFO L636 BasicCegarLoop]: 0 DeclaredPredicates, 232 GetRequests, 210 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 189 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=212, Invalid=340, Unknown=0, NotChecked=0, Total=552 [2019-09-20 12:58:57,935 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 265 states. [2019-09-20 12:58:57,956 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 265 to 243. [2019-09-20 12:58:57,956 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 243 states. [2019-09-20 12:58:57,957 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 243 states to 243 states and 253 transitions. [2019-09-20 12:58:57,957 INFO L78 Accepts]: Start accepts. Automaton has 243 states and 253 transitions. Word has length 219 [2019-09-20 12:58:57,958 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-20 12:58:57,958 INFO L475 AbstractCegarLoop]: Abstraction has 243 states and 253 transitions. [2019-09-20 12:58:57,958 INFO L476 AbstractCegarLoop]: Interpolant automaton has 23 states. [2019-09-20 12:58:57,958 INFO L276 IsEmpty]: Start isEmpty. Operand 243 states and 253 transitions. [2019-09-20 12:58:57,960 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 243 [2019-09-20 12:58:57,961 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 12:58:57,961 INFO L407 BasicCegarLoop]: trace histogram [100, 100, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 12:58:57,961 INFO L418 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 12:58:57,961 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 12:58:57,961 INFO L82 PathProgramCache]: Analyzing trace with hash -1649132245, now seen corresponding path program 19 times [2019-09-20 12:58:57,962 INFO L224 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-20 12:58:57,962 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-20 12:58:57,963 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 12:58:57,963 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-20 12:58:57,963 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 12:58:58,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 12:59:04,700 INFO L134 CoverageAnalysis]: Checked inductivity of 11045 backedges. 11036 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-09-20 12:59:04,700 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-09-20 12:59:04,700 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [105] imperfect sequences [] total 105 [2019-09-20 12:59:04,701 INFO L454 AbstractCegarLoop]: Interpolant automaton has 105 states [2019-09-20 12:59:04,702 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 105 interpolants. [2019-09-20 12:59:04,705 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5257, Invalid=5663, Unknown=0, NotChecked=0, Total=10920 [2019-09-20 12:59:04,706 INFO L87 Difference]: Start difference. First operand 243 states and 253 transitions. Second operand 105 states. [2019-09-20 12:59:06,724 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-20 12:59:06,724 INFO L93 Difference]: Finished difference Result 9783 states and 10243 transitions. [2019-09-20 12:59:06,724 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 105 states. [2019-09-20 12:59:06,725 INFO L78 Accepts]: Start accepts. Automaton has 105 states. Word has length 242 [2019-09-20 12:59:06,726 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-20 12:59:06,726 INFO L225 Difference]: With dead ends: 9783 [2019-09-20 12:59:06,726 INFO L226 Difference]: Without dead ends: 0 [2019-09-20 12:59:06,756 INFO L636 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 300 ImplicationChecksByTransitivity, 6.5s TimeCoverageRelationStatistics Valid=5261, Invalid=5869, Unknown=0, NotChecked=0, Total=11130 [2019-09-20 12:59:06,757 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2019-09-20 12:59:06,757 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2019-09-20 12:59:06,757 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2019-09-20 12:59:06,757 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2019-09-20 12:59:06,758 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 242 [2019-09-20 12:59:06,758 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-20 12:59:06,758 INFO L475 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2019-09-20 12:59:06,758 INFO L476 AbstractCegarLoop]: Interpolant automaton has 105 states. [2019-09-20 12:59:06,758 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2019-09-20 12:59:06,759 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2019-09-20 12:59:06,766 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2019-09-20 12:59:08,977 WARN L191 SmtUtils]: Spent 2.17 s on a formula simplification. DAG size of input: 699 DAG size of output: 676