/usr/bin/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 --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-lit/ddlm2013.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-18 16:24:42,365 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-18 16:24:42,368 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-18 16:24:42,408 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-18 16:24:42,409 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-18 16:24:42,419 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-18 16:24:42,420 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-18 16:24:42,424 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-18 16:24:42,426 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-18 16:24:42,429 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-18 16:24:42,430 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-18 16:24:42,431 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-18 16:24:42,431 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 16:24:42,434 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 16:24:42,437 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 16:24:42,438 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 16:24:42,439 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 16:24:42,441 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 16:24:42,443 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 16:24:42,446 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 16:24:42,451 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 16:24:42,452 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 16:24:42,454 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 16:24:42,455 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 16:24:42,459 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-18 16:24:42,470 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 16:24:42,471 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 16:24:42,472 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 16:24:42,472 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-18 16:24:42,494 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 16:24:42,494 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 16:24:42,495 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 16:24:42,495 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 16:24:42,496 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 16:24:42,496 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 16:24:42,496 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 16:24:42,496 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 16:24:42,496 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 16:24:42,497 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 16:24:42,497 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 16:24:42,497 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 16:24:42,497 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 16:24:42,497 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 16:24:42,498 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 16:24:42,498 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 16:24:42,498 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 16:24:42,498 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 16:24:42,498 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 16:24:42,499 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 16:24:42,499 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 16:24:42,499 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 16:24:42,499 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 16:24:42,499 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 16:24:42,499 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 16:24:42,500 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 16:24:42,500 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 16:24:42,500 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 16:24:42,500 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 16:24:42,500 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true [2020-08-18 16:24:42,793 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 16:24:42,811 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 16:24:42,814 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 16:24:42,816 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 16:24:42,817 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 16:24:42,818 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/ddlm2013.i [2020-08-18 16:24:42,892 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/6b457b537/b21984166e6a40b18925db01ffb81a43/FLAG4b449007a [2020-08-18 16:24:43,320 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 16:24:43,321 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-lit/ddlm2013.i [2020-08-18 16:24:43,327 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/6b457b537/b21984166e6a40b18925db01ffb81a43/FLAG4b449007a [2020-08-18 16:24:43,764 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/6b457b537/b21984166e6a40b18925db01ffb81a43 [2020-08-18 16:24:43,771 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 16:24:43,772 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 16:24:43,773 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 16:24:43,774 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 16:24:43,777 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 16:24:43,778 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 04:24:43" (1/1) ... [2020-08-18 16:24:43,780 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7105da2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:24:43, skipping insertion in model container [2020-08-18 16:24:43,781 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 04:24:43" (1/1) ... [2020-08-18 16:24:43,788 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 16:24:43,802 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 16:24:43,978 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 16:24:43,981 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 16:24:43,996 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 16:24:44,007 INFO L208 MainTranslator]: Completed translation [2020-08-18 16:24:44,008 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:24:44 WrapperNode [2020-08-18 16:24:44,008 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 16:24:44,009 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 16:24:44,009 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 16:24:44,009 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 16:24:44,018 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:24:44" (1/1) ... [2020-08-18 16:24:44,019 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:24:44" (1/1) ... [2020-08-18 16:24:44,099 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:24:44" (1/1) ... [2020-08-18 16:24:44,099 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:24:44" (1/1) ... [2020-08-18 16:24:44,105 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:24:44" (1/1) ... [2020-08-18 16:24:44,110 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:24:44" (1/1) ... [2020-08-18 16:24:44,111 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:24:44" (1/1) ... [2020-08-18 16:24:44,112 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 16:24:44,113 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 16:24:44,113 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 16:24:44,113 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 16:24:44,114 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:24:44" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/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 [2020-08-18 16:24:44,177 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 16:24:44,177 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 16:24:44,177 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-08-18 16:24:44,177 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-18 16:24:44,177 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 16:24:44,178 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 16:24:44,179 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-18 16:24:44,179 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-08-18 16:24:44,179 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-18 16:24:44,179 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-18 16:24:44,180 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 16:24:44,180 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 16:24:44,181 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 16:24:44,381 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 16:24:44,381 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-18 16:24:44,385 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 04:24:44 BoogieIcfgContainer [2020-08-18 16:24:44,385 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 16:24:44,386 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 16:24:44,386 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 16:24:44,389 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 16:24:44,390 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 04:24:43" (1/3) ... [2020-08-18 16:24:44,390 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@31c2346d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 04:24:44, skipping insertion in model container [2020-08-18 16:24:44,391 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:24:44" (2/3) ... [2020-08-18 16:24:44,391 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@31c2346d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 04:24:44, skipping insertion in model container [2020-08-18 16:24:44,391 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 04:24:44" (3/3) ... [2020-08-18 16:24:44,393 INFO L109 eAbstractionObserver]: Analyzing ICFG ddlm2013.i [2020-08-18 16:24:44,403 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 16:24:44,410 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-18 16:24:44,424 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-18 16:24:44,452 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 16:24:44,453 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 16:24:44,453 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 16:24:44,453 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 16:24:44,453 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 16:24:44,454 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 16:24:44,454 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 16:24:44,454 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 16:24:44,479 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states. [2020-08-18 16:24:44,485 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-18 16:24:44,486 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:44,487 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:44,487 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:44,494 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:44,495 INFO L82 PathProgramCache]: Analyzing trace with hash -917653371, now seen corresponding path program 1 times [2020-08-18 16:24:44,504 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:44,504 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1420195858] [2020-08-18 16:24:44,505 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:44,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:44,614 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:44,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:44,621 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:44,622 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1420195858] [2020-08-18 16:24:44,626 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 16:24:44,626 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-08-18 16:24:44,627 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1843176567] [2020-08-18 16:24:44,634 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-08-18 16:24:44,634 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:44,644 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-08-18 16:24:44,645 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-18 16:24:44,647 INFO L87 Difference]: Start difference. First operand 22 states. Second operand 2 states. [2020-08-18 16:24:44,668 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:44,668 INFO L93 Difference]: Finished difference Result 35 states and 42 transitions. [2020-08-18 16:24:44,669 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-08-18 16:24:44,670 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 12 [2020-08-18 16:24:44,670 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:44,679 INFO L225 Difference]: With dead ends: 35 [2020-08-18 16:24:44,680 INFO L226 Difference]: Without dead ends: 15 [2020-08-18 16:24:44,683 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-18 16:24:44,700 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-18 16:24:44,717 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-18 16:24:44,718 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-18 16:24:44,719 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2020-08-18 16:24:44,720 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 12 [2020-08-18 16:24:44,721 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:44,721 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2020-08-18 16:24:44,721 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-08-18 16:24:44,721 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2020-08-18 16:24:44,722 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-18 16:24:44,722 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:44,722 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:44,722 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 16:24:44,723 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:44,723 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:44,723 INFO L82 PathProgramCache]: Analyzing trace with hash -1750778295, now seen corresponding path program 1 times [2020-08-18 16:24:44,723 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:44,724 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1526625034] [2020-08-18 16:24:44,724 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:44,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:44,773 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:44,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:44,782 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:44,782 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1526625034] [2020-08-18 16:24:44,783 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 16:24:44,783 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-18 16:24:44,783 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [134304655] [2020-08-18 16:24:44,789 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-18 16:24:44,789 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:44,790 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-18 16:24:44,790 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 16:24:44,790 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 3 states. [2020-08-18 16:24:44,814 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:44,814 INFO L93 Difference]: Finished difference Result 24 states and 27 transitions. [2020-08-18 16:24:44,815 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-18 16:24:44,815 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 13 [2020-08-18 16:24:44,815 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:44,816 INFO L225 Difference]: With dead ends: 24 [2020-08-18 16:24:44,816 INFO L226 Difference]: Without dead ends: 15 [2020-08-18 16:24:44,817 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 16:24:44,818 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-18 16:24:44,820 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-18 16:24:44,820 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-18 16:24:44,821 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2020-08-18 16:24:44,821 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 13 [2020-08-18 16:24:44,822 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:44,822 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2020-08-18 16:24:44,822 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-18 16:24:44,822 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2020-08-18 16:24:44,823 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-18 16:24:44,823 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:44,823 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:44,823 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 16:24:44,824 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:44,824 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:44,824 INFO L82 PathProgramCache]: Analyzing trace with hash -941431669, now seen corresponding path program 1 times [2020-08-18 16:24:44,825 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:44,825 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1007302866] [2020-08-18 16:24:44,825 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:44,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:45,082 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:45,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:45,087 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:45,088 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1007302866] [2020-08-18 16:24:45,088 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 16:24:45,088 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-18 16:24:45,089 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2103688692] [2020-08-18 16:24:45,089 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 16:24:45,090 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:45,090 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 16:24:45,090 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-18 16:24:45,091 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand 5 states. [2020-08-18 16:24:45,125 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:45,125 INFO L93 Difference]: Finished difference Result 23 states and 24 transitions. [2020-08-18 16:24:45,125 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 16:24:45,126 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-08-18 16:24:45,126 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:45,127 INFO L225 Difference]: With dead ends: 23 [2020-08-18 16:24:45,127 INFO L226 Difference]: Without dead ends: 17 [2020-08-18 16:24:45,128 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-18 16:24:45,128 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-18 16:24:45,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-18 16:24:45,131 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-18 16:24:45,132 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2020-08-18 16:24:45,132 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 13 [2020-08-18 16:24:45,133 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:45,133 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2020-08-18 16:24:45,133 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 16:24:45,133 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2020-08-18 16:24:45,134 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-18 16:24:45,134 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:45,134 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:45,134 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-18 16:24:45,135 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:45,135 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:45,135 INFO L82 PathProgramCache]: Analyzing trace with hash 447870728, now seen corresponding path program 1 times [2020-08-18 16:24:45,135 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:45,136 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1730382697] [2020-08-18 16:24:45,136 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:45,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:45,293 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:45,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:45,297 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:45,297 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1730382697] [2020-08-18 16:24:45,297 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 16:24:45,297 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 16:24:45,298 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [663528720] [2020-08-18 16:24:45,298 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 16:24:45,298 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:45,299 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 16:24:45,299 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 16:24:45,299 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand 4 states. [2020-08-18 16:24:45,318 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:45,319 INFO L93 Difference]: Finished difference Result 26 states and 28 transitions. [2020-08-18 16:24:45,319 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-18 16:24:45,320 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 16 [2020-08-18 16:24:45,320 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:45,320 INFO L225 Difference]: With dead ends: 26 [2020-08-18 16:24:45,321 INFO L226 Difference]: Without dead ends: 17 [2020-08-18 16:24:45,321 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 16:24:45,322 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-18 16:24:45,324 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-18 16:24:45,324 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-18 16:24:45,325 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-08-18 16:24:45,325 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 16 [2020-08-18 16:24:45,326 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:45,326 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-08-18 16:24:45,326 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 16:24:45,326 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-08-18 16:24:45,327 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-18 16:24:45,327 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:45,327 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:45,327 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-18 16:24:45,327 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:45,328 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:45,328 INFO L82 PathProgramCache]: Analyzing trace with hash 1257217354, now seen corresponding path program 1 times [2020-08-18 16:24:45,328 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:45,328 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1958239825] [2020-08-18 16:24:45,328 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:45,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:45,515 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:45,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:45,519 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:45,519 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1958239825] [2020-08-18 16:24:45,520 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:45,520 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-18 16:24:45,520 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [847332463] [2020-08-18 16:24:45,521 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-18 16:24:45,521 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:45,521 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-18 16:24:45,522 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-08-18 16:24:45,522 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 7 states. [2020-08-18 16:24:45,634 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:45,634 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2020-08-18 16:24:45,635 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-18 16:24:45,635 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 16 [2020-08-18 16:24:45,635 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:45,636 INFO L225 Difference]: With dead ends: 26 [2020-08-18 16:24:45,636 INFO L226 Difference]: Without dead ends: 20 [2020-08-18 16:24:45,637 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2020-08-18 16:24:45,637 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-18 16:24:45,640 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-18 16:24:45,640 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-18 16:24:45,641 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2020-08-18 16:24:45,641 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 16 [2020-08-18 16:24:45,642 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:45,642 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2020-08-18 16:24:45,642 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-18 16:24:45,642 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2020-08-18 16:24:45,643 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-18 16:24:45,643 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:45,643 INFO L422 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:45,643 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-18 16:24:45,644 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:45,644 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:45,644 INFO L82 PathProgramCache]: Analyzing trace with hash -1335969749, now seen corresponding path program 2 times [2020-08-18 16:24:45,644 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:45,645 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1008907413] [2020-08-18 16:24:45,645 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:45,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:45,880 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:45,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:45,884 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:45,884 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1008907413] [2020-08-18 16:24:45,884 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:45,885 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-18 16:24:45,885 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [3555658] [2020-08-18 16:24:45,885 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-18 16:24:45,885 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:45,886 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-18 16:24:45,886 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-08-18 16:24:45,886 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 9 states. [2020-08-18 16:24:46,040 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:46,041 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2020-08-18 16:24:46,041 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-18 16:24:46,042 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 19 [2020-08-18 16:24:46,042 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:46,042 INFO L225 Difference]: With dead ends: 29 [2020-08-18 16:24:46,043 INFO L226 Difference]: Without dead ends: 23 [2020-08-18 16:24:46,043 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2020-08-18 16:24:46,044 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-18 16:24:46,046 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-08-18 16:24:46,047 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-18 16:24:46,047 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2020-08-18 16:24:46,048 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 19 [2020-08-18 16:24:46,048 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:46,048 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2020-08-18 16:24:46,048 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-18 16:24:46,048 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2020-08-18 16:24:46,049 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-18 16:24:46,049 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:46,049 INFO L422 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:46,049 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-18 16:24:46,050 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:46,050 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:46,050 INFO L82 PathProgramCache]: Analyzing trace with hash -1396202070, now seen corresponding path program 3 times [2020-08-18 16:24:46,050 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:46,050 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [859303750] [2020-08-18 16:24:46,051 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:46,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:46,302 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:46,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:46,307 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:46,307 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [859303750] [2020-08-18 16:24:46,307 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:46,308 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-18 16:24:46,308 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [906261620] [2020-08-18 16:24:46,308 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-18 16:24:46,308 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:46,309 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-18 16:24:46,309 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2020-08-18 16:24:46,309 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 11 states. [2020-08-18 16:24:50,722 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:50,722 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2020-08-18 16:24:50,723 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-18 16:24:50,723 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 22 [2020-08-18 16:24:50,723 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:50,724 INFO L225 Difference]: With dead ends: 32 [2020-08-18 16:24:50,724 INFO L226 Difference]: Without dead ends: 26 [2020-08-18 16:24:50,725 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=33, Invalid=148, Unknown=1, NotChecked=0, Total=182 [2020-08-18 16:24:50,725 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-18 16:24:50,729 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-08-18 16:24:50,730 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-18 16:24:50,733 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2020-08-18 16:24:50,733 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 22 [2020-08-18 16:24:50,733 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:50,734 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2020-08-18 16:24:50,734 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-18 16:24:50,734 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2020-08-18 16:24:50,736 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-18 16:24:50,736 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:50,736 INFO L422 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:50,737 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-18 16:24:50,737 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:50,738 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:50,738 INFO L82 PathProgramCache]: Analyzing trace with hash -480947253, now seen corresponding path program 4 times [2020-08-18 16:24:50,738 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:50,739 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1884733146] [2020-08-18 16:24:50,739 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:50,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:51,091 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:51,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:51,096 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:51,097 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1884733146] [2020-08-18 16:24:51,097 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:51,097 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-18 16:24:51,097 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [223596144] [2020-08-18 16:24:51,098 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-18 16:24:51,098 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:51,098 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-18 16:24:51,098 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2020-08-18 16:24:51,099 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 13 states. [2020-08-18 16:24:51,299 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:51,299 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2020-08-18 16:24:51,300 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-18 16:24:51,300 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 25 [2020-08-18 16:24:51,300 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:51,301 INFO L225 Difference]: With dead ends: 35 [2020-08-18 16:24:51,301 INFO L226 Difference]: Without dead ends: 29 [2020-08-18 16:24:51,301 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=37, Invalid=203, Unknown=0, NotChecked=0, Total=240 [2020-08-18 16:24:51,302 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-18 16:24:51,304 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-08-18 16:24:51,305 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-18 16:24:51,305 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2020-08-18 16:24:51,306 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 25 [2020-08-18 16:24:51,306 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:51,306 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2020-08-18 16:24:51,306 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-18 16:24:51,306 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2020-08-18 16:24:51,307 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-18 16:24:51,307 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:51,307 INFO L422 BasicCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:51,307 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-18 16:24:51,308 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:51,308 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:51,308 INFO L82 PathProgramCache]: Analyzing trace with hash 1422910986, now seen corresponding path program 5 times [2020-08-18 16:24:51,308 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:51,308 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1744528093] [2020-08-18 16:24:51,309 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:51,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:51,685 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:51,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:51,691 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:51,691 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1744528093] [2020-08-18 16:24:51,691 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:51,692 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-18 16:24:51,694 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1956390821] [2020-08-18 16:24:51,695 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-18 16:24:51,695 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:51,695 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-18 16:24:51,696 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2020-08-18 16:24:51,696 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 15 states. [2020-08-18 16:24:56,189 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:56,189 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2020-08-18 16:24:56,189 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-18 16:24:56,189 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 28 [2020-08-18 16:24:56,190 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:56,190 INFO L225 Difference]: With dead ends: 38 [2020-08-18 16:24:56,190 INFO L226 Difference]: Without dead ends: 32 [2020-08-18 16:24:56,191 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=41, Invalid=264, Unknown=1, NotChecked=0, Total=306 [2020-08-18 16:24:56,191 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-18 16:24:56,197 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2020-08-18 16:24:56,197 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-08-18 16:24:56,202 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2020-08-18 16:24:56,202 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 28 [2020-08-18 16:24:56,202 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:56,203 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2020-08-18 16:24:56,203 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-18 16:24:56,203 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2020-08-18 16:24:56,203 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-18 16:24:56,203 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:56,205 INFO L422 BasicCegarLoop]: trace histogram [7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:56,205 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-18 16:24:56,206 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:56,206 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:56,206 INFO L82 PathProgramCache]: Analyzing trace with hash -74401941, now seen corresponding path program 6 times [2020-08-18 16:24:56,206 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:56,206 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1210244288] [2020-08-18 16:24:56,206 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:56,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:56,679 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:56,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:56,685 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:56,686 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1210244288] [2020-08-18 16:24:56,686 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:56,686 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-18 16:24:56,686 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1305581867] [2020-08-18 16:24:56,687 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-18 16:24:56,687 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:56,687 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-18 16:24:56,688 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2020-08-18 16:24:56,688 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 17 states. [2020-08-18 16:25:01,269 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:25:01,270 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2020-08-18 16:25:01,270 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-18 16:25:01,270 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 31 [2020-08-18 16:25:01,270 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:25:01,271 INFO L225 Difference]: With dead ends: 41 [2020-08-18 16:25:01,271 INFO L226 Difference]: Without dead ends: 35 [2020-08-18 16:25:01,272 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=45, Invalid=334, Unknown=1, NotChecked=0, Total=380 [2020-08-18 16:25:01,272 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-18 16:25:01,275 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-08-18 16:25:01,275 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-18 16:25:01,276 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2020-08-18 16:25:01,276 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 31 [2020-08-18 16:25:01,276 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:25:01,276 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2020-08-18 16:25:01,276 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-18 16:25:01,276 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2020-08-18 16:25:01,277 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-18 16:25:01,277 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:25:01,277 INFO L422 BasicCegarLoop]: trace histogram [8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:25:01,278 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-18 16:25:01,278 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:25:01,278 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:25:01,278 INFO L82 PathProgramCache]: Analyzing trace with hash 1006526058, now seen corresponding path program 7 times [2020-08-18 16:25:01,278 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:25:01,279 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [239711863] [2020-08-18 16:25:01,279 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:25:01,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:25:01,767 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:25:01,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:25:01,773 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:25:01,774 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [239711863] [2020-08-18 16:25:01,774 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:25:01,774 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-18 16:25:01,774 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1840019669] [2020-08-18 16:25:01,774 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-18 16:25:01,775 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:25:01,775 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-18 16:25:01,776 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=307, Unknown=0, NotChecked=0, Total=342 [2020-08-18 16:25:01,776 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 19 states. [2020-08-18 16:25:16,723 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:25:16,723 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2020-08-18 16:25:16,723 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-18 16:25:16,724 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 34 [2020-08-18 16:25:16,724 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:25:16,724 INFO L225 Difference]: With dead ends: 44 [2020-08-18 16:25:16,724 INFO L226 Difference]: Without dead ends: 38 [2020-08-18 16:25:16,725 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 8.8s TimeCoverageRelationStatistics Valid=49, Invalid=409, Unknown=4, NotChecked=0, Total=462 [2020-08-18 16:25:16,725 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-18 16:25:16,731 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-08-18 16:25:16,735 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-18 16:25:16,735 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2020-08-18 16:25:16,736 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 34 [2020-08-18 16:25:16,736 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:25:16,736 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2020-08-18 16:25:16,736 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-18 16:25:16,736 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2020-08-18 16:25:16,738 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-18 16:25:16,738 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:25:16,738 INFO L422 BasicCegarLoop]: trace histogram [9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:25:16,738 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-18 16:25:16,738 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:25:16,739 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:25:16,742 INFO L82 PathProgramCache]: Analyzing trace with hash -732241141, now seen corresponding path program 8 times [2020-08-18 16:25:16,742 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:25:16,742 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [492655248] [2020-08-18 16:25:16,742 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:25:16,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:25:17,318 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:25:17,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:25:17,325 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:25:17,325 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [492655248] [2020-08-18 16:25:17,325 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:25:17,325 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-18 16:25:17,326 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [106591363] [2020-08-18 16:25:17,326 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-18 16:25:17,326 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:25:17,327 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-18 16:25:17,327 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=381, Unknown=0, NotChecked=0, Total=420 [2020-08-18 16:25:17,327 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 21 states. [2020-08-18 16:25:17,757 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:25:17,757 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2020-08-18 16:25:17,758 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-18 16:25:17,758 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 37 [2020-08-18 16:25:17,758 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:25:17,759 INFO L225 Difference]: With dead ends: 47 [2020-08-18 16:25:17,759 INFO L226 Difference]: Without dead ends: 41 [2020-08-18 16:25:17,760 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=53, Invalid=499, Unknown=0, NotChecked=0, Total=552 [2020-08-18 16:25:17,760 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-18 16:25:17,763 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-08-18 16:25:17,763 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-18 16:25:17,764 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2020-08-18 16:25:17,764 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 37 [2020-08-18 16:25:17,764 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:25:17,765 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2020-08-18 16:25:17,765 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-18 16:25:17,765 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2020-08-18 16:25:17,766 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-18 16:25:17,766 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:25:17,766 INFO L422 BasicCegarLoop]: trace histogram [10, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:25:17,766 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-18 16:25:17,766 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:25:17,766 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:25:17,767 INFO L82 PathProgramCache]: Analyzing trace with hash 1254690506, now seen corresponding path program 9 times [2020-08-18 16:25:17,767 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:25:17,767 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [503967010] [2020-08-18 16:25:17,767 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:25:17,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:25:18,510 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:25:18,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:25:18,523 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:25:18,523 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [503967010] [2020-08-18 16:25:18,523 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:25:18,523 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-18 16:25:18,524 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [347746096] [2020-08-18 16:25:18,524 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-18 16:25:18,525 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:25:18,525 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-18 16:25:18,526 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=463, Unknown=0, NotChecked=0, Total=506 [2020-08-18 16:25:18,526 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 23 states. [2020-08-18 16:25:37,865 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:25:37,865 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2020-08-18 16:25:37,866 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-18 16:25:37,866 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 40 [2020-08-18 16:25:37,866 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:25:37,867 INFO L225 Difference]: With dead ends: 50 [2020-08-18 16:25:37,867 INFO L226 Difference]: Without dead ends: 44 [2020-08-18 16:25:37,868 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 9.1s TimeCoverageRelationStatistics Valid=57, Invalid=589, Unknown=4, NotChecked=0, Total=650 [2020-08-18 16:25:37,869 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-18 16:25:37,871 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-08-18 16:25:37,874 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-18 16:25:37,874 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2020-08-18 16:25:37,875 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 40 [2020-08-18 16:25:37,875 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:25:37,875 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2020-08-18 16:25:37,875 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-18 16:25:37,875 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2020-08-18 16:25:37,876 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-18 16:25:37,876 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:25:37,876 INFO L422 BasicCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:25:37,876 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-18 16:25:37,876 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:25:37,877 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:25:37,877 INFO L82 PathProgramCache]: Analyzing trace with hash 696112811, now seen corresponding path program 10 times [2020-08-18 16:25:37,877 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:25:37,877 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1379937558] [2020-08-18 16:25:37,877 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:25:37,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:25:38,631 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:25:38,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:25:38,640 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:25:38,640 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1379937558] [2020-08-18 16:25:38,640 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:25:38,640 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-18 16:25:38,641 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [158784895] [2020-08-18 16:25:38,641 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-18 16:25:38,641 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:25:38,642 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-18 16:25:38,642 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=553, Unknown=0, NotChecked=0, Total=600 [2020-08-18 16:25:38,642 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 25 states. [2020-08-18 16:25:57,954 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:25:57,955 INFO L93 Difference]: Finished difference Result 53 states and 53 transitions. [2020-08-18 16:25:57,955 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-18 16:25:57,956 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 43 [2020-08-18 16:25:57,956 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:25:57,956 INFO L225 Difference]: With dead ends: 53 [2020-08-18 16:25:57,957 INFO L226 Difference]: Without dead ends: 47 [2020-08-18 16:25:57,957 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 7.1s TimeCoverageRelationStatistics Valid=61, Invalid=692, Unknown=3, NotChecked=0, Total=756 [2020-08-18 16:25:57,959 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-18 16:25:57,965 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2020-08-18 16:25:57,965 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-18 16:25:57,965 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2020-08-18 16:25:57,966 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 43 [2020-08-18 16:25:57,966 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:25:57,966 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2020-08-18 16:25:57,966 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-18 16:25:57,966 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2020-08-18 16:25:57,967 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-18 16:25:57,967 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:25:57,967 INFO L422 BasicCegarLoop]: trace histogram [12, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:25:57,967 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-18 16:25:57,967 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:25:57,967 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:25:57,968 INFO L82 PathProgramCache]: Analyzing trace with hash -1188694230, now seen corresponding path program 11 times [2020-08-18 16:25:57,968 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:25:57,968 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2030922712] [2020-08-18 16:25:57,968 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:25:58,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:25:58,907 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:25:58,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:25:58,915 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:25:58,915 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2030922712] [2020-08-18 16:25:58,915 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:25:58,915 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-18 16:25:58,915 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1647655242] [2020-08-18 16:25:58,916 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-18 16:25:58,916 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:25:58,916 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-18 16:25:58,917 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=651, Unknown=0, NotChecked=0, Total=702 [2020-08-18 16:25:58,917 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 27 states.