/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 --traceabstraction.additional.smt.options enumeration-timeout=5000 --traceabstraction.additional.smt.options interpolation-heuristic=SMALLESTAMONGWIDE --traceabstraction.additional.smt.options tolerance=0.4 --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-lit/ddlm2013.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-22 05:36:15,612 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-22 05:36:15,614 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-22 05:36:15,639 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-22 05:36:15,639 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-22 05:36:15,641 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-22 05:36:15,642 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-22 05:36:15,644 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-22 05:36:15,645 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-22 05:36:15,646 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-22 05:36:15,647 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-22 05:36:15,649 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-22 05:36:15,649 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-22 05:36:15,650 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-22 05:36:15,651 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-22 05:36:15,652 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-22 05:36:15,653 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-22 05:36:15,654 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-22 05:36:15,656 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-22 05:36:15,659 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-22 05:36:15,661 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-22 05:36:15,662 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-22 05:36:15,664 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-22 05:36:15,665 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-22 05:36:15,668 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-22 05:36:15,679 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-22 05:36:15,680 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-22 05:36:15,681 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-22 05:36:15,682 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 [2020-08-22 05:36:15,706 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-22 05:36:15,707 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-22 05:36:15,708 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-22 05:36:15,708 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-22 05:36:15,708 INFO L138 SettingsManager]: * Use SBE=true [2020-08-22 05:36:15,709 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-22 05:36:15,709 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-22 05:36:15,709 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-22 05:36:15,709 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-22 05:36:15,709 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-22 05:36:15,710 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-22 05:36:15,710 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-22 05:36:15,710 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-22 05:36:15,710 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-22 05:36:15,710 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-22 05:36:15,711 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-22 05:36:15,711 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-22 05:36:15,711 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-22 05:36:15,711 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-22 05:36:15,711 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-22 05:36:15,712 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-22 05:36:15,712 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-22 05:36:15,712 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-22 05:36:15,712 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-22 05:36:15,712 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-22 05:36:15,713 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-22 05:36:15,713 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-22 05:36:15,713 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-22 05:36:15,713 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-22 05:36:15,713 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 Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.4;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.4;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.4;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.4;log-additional-information=true; [2020-08-22 05:36:16,003 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-22 05:36:16,015 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-22 05:36:16,018 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-22 05:36:16,020 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-22 05:36:16,020 INFO L275 PluginConnector]: CDTParser initialized [2020-08-22 05:36:16,021 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/ddlm2013.i [2020-08-22 05:36:16,085 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/b983e9aff/0c0d12de47d946faa44c064e2b09bb3c/FLAGb6469b809 [2020-08-22 05:36:16,508 INFO L306 CDTParser]: Found 1 translation units. [2020-08-22 05:36:16,509 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-lit/ddlm2013.i [2020-08-22 05:36:16,516 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/b983e9aff/0c0d12de47d946faa44c064e2b09bb3c/FLAGb6469b809 [2020-08-22 05:36:16,865 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/b983e9aff/0c0d12de47d946faa44c064e2b09bb3c [2020-08-22 05:36:16,878 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-22 05:36:16,880 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-22 05:36:16,881 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-22 05:36:16,881 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-22 05:36:16,885 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-22 05:36:16,886 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 05:36:16" (1/1) ... [2020-08-22 05:36:16,889 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@28b610eb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 05:36:16, skipping insertion in model container [2020-08-22 05:36:16,889 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 05:36:16" (1/1) ... [2020-08-22 05:36:16,897 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-22 05:36:16,915 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-22 05:36:17,094 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 05:36:17,100 INFO L203 MainTranslator]: Completed pre-run [2020-08-22 05:36:17,123 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 05:36:17,139 INFO L208 MainTranslator]: Completed translation [2020-08-22 05:36:17,140 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 05:36:17 WrapperNode [2020-08-22 05:36:17,140 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-22 05:36:17,141 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-22 05:36:17,141 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-22 05:36:17,141 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-22 05:36:17,150 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 05:36:17" (1/1) ... [2020-08-22 05:36:17,151 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 05:36:17" (1/1) ... [2020-08-22 05:36:17,229 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 05:36:17" (1/1) ... [2020-08-22 05:36:17,230 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 05:36:17" (1/1) ... [2020-08-22 05:36:17,240 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 05:36:17" (1/1) ... [2020-08-22 05:36:17,245 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 05:36:17" (1/1) ... [2020-08-22 05:36:17,246 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 05:36:17" (1/1) ... [2020-08-22 05:36:17,248 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-22 05:36:17,248 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-22 05:36:17,249 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-22 05:36:17,249 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-22 05:36:17,250 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 05:36:17" (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 [2020-08-22 05:36:17,311 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-22 05:36:17,312 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-22 05:36:17,312 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-08-22 05:36:17,312 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-22 05:36:17,312 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-22 05:36:17,312 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-22 05:36:17,313 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-22 05:36:17,313 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-08-22 05:36:17,313 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-22 05:36:17,313 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-22 05:36:17,313 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-22 05:36:17,313 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-22 05:36:17,314 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-22 05:36:17,518 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-22 05:36:17,519 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-22 05:36:17,525 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 05:36:17 BoogieIcfgContainer [2020-08-22 05:36:17,526 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-22 05:36:17,527 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-22 05:36:17,527 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-22 05:36:17,529 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-22 05:36:17,531 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.08 05:36:16" (1/3) ... [2020-08-22 05:36:17,532 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@25c6dbdf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 05:36:17, skipping insertion in model container [2020-08-22 05:36:17,533 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 05:36:17" (2/3) ... [2020-08-22 05:36:17,533 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@25c6dbdf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 05:36:17, skipping insertion in model container [2020-08-22 05:36:17,533 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 05:36:17" (3/3) ... [2020-08-22 05:36:17,535 INFO L109 eAbstractionObserver]: Analyzing ICFG ddlm2013.i [2020-08-22 05:36:17,544 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-22 05:36:17,550 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-22 05:36:17,560 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-22 05:36:17,581 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-22 05:36:17,581 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-22 05:36:17,581 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-22 05:36:17,581 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-22 05:36:17,581 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-22 05:36:17,581 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-22 05:36:17,582 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-22 05:36:17,582 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-22 05:36:17,598 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states. [2020-08-22 05:36:17,603 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-22 05:36:17,604 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 05:36:17,605 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 05:36:17,605 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 05:36:17,610 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 05:36:17,610 INFO L82 PathProgramCache]: Analyzing trace with hash -917653371, now seen corresponding path program 1 times [2020-08-22 05:36:17,617 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 05:36:17,617 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1352097895] [2020-08-22 05:36:17,618 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 05:36:17,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 05:36:17,728 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 05:36:17,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 05:36:17,734 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 05:36:17,735 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1352097895] [2020-08-22 05:36:17,737 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 05:36:17,737 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-08-22 05:36:17,738 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [488204580] [2020-08-22 05:36:17,743 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-08-22 05:36:17,744 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 05:36:17,758 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-08-22 05:36:17,759 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-22 05:36:17,761 INFO L87 Difference]: Start difference. First operand 22 states. Second operand 2 states. [2020-08-22 05:36:17,784 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 05:36:17,784 INFO L93 Difference]: Finished difference Result 35 states and 42 transitions. [2020-08-22 05:36:17,785 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-08-22 05:36:17,786 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 12 [2020-08-22 05:36:17,787 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 05:36:17,796 INFO L225 Difference]: With dead ends: 35 [2020-08-22 05:36:17,796 INFO L226 Difference]: Without dead ends: 15 [2020-08-22 05:36:17,800 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 [2020-08-22 05:36:17,818 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-22 05:36:17,835 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-22 05:36:17,836 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-22 05:36:17,837 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2020-08-22 05:36:17,839 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 12 [2020-08-22 05:36:17,839 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 05:36:17,839 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2020-08-22 05:36:17,840 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-08-22 05:36:17,840 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2020-08-22 05:36:17,840 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-22 05:36:17,841 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 05:36:17,841 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 05:36:17,841 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-22 05:36:17,841 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 05:36:17,842 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 05:36:17,842 INFO L82 PathProgramCache]: Analyzing trace with hash -1750778295, now seen corresponding path program 1 times [2020-08-22 05:36:17,842 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 05:36:17,843 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [440836482] [2020-08-22 05:36:17,843 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 05:36:17,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 05:36:17,886 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 05:36:17,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 05:36:17,891 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 05:36:17,891 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [440836482] [2020-08-22 05:36:17,892 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 05:36:17,892 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-22 05:36:17,892 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [303052402] [2020-08-22 05:36:17,894 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-22 05:36:17,894 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 05:36:17,895 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-22 05:36:17,895 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-22 05:36:17,895 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 3 states. [2020-08-22 05:36:17,924 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 05:36:17,925 INFO L93 Difference]: Finished difference Result 24 states and 27 transitions. [2020-08-22 05:36:17,925 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-22 05:36:17,926 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 13 [2020-08-22 05:36:17,926 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 05:36:17,927 INFO L225 Difference]: With dead ends: 24 [2020-08-22 05:36:17,927 INFO L226 Difference]: Without dead ends: 15 [2020-08-22 05:36:17,928 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 [2020-08-22 05:36:17,929 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-22 05:36:17,931 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-22 05:36:17,932 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-22 05:36:17,932 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2020-08-22 05:36:17,933 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 13 [2020-08-22 05:36:17,933 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 05:36:17,933 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2020-08-22 05:36:17,933 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-22 05:36:17,934 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2020-08-22 05:36:17,934 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-22 05:36:17,934 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 05:36:17,935 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 05:36:17,935 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-22 05:36:17,935 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 05:36:17,935 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 05:36:17,936 INFO L82 PathProgramCache]: Analyzing trace with hash -941431669, now seen corresponding path program 1 times [2020-08-22 05:36:17,936 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 05:36:17,936 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2030928954] [2020-08-22 05:36:17,937 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 05:36:17,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 05:36:18,180 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 05:36:18,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 05:36:18,189 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 05:36:18,190 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2030928954] [2020-08-22 05:36:18,190 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 05:36:18,190 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-22 05:36:18,191 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1338379383] [2020-08-22 05:36:18,191 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-22 05:36:18,192 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 05:36:18,192 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-22 05:36:18,192 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-22 05:36:18,193 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand 5 states. [2020-08-22 05:36:18,239 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 05:36:18,240 INFO L93 Difference]: Finished difference Result 23 states and 24 transitions. [2020-08-22 05:36:18,241 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-22 05:36:18,241 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-08-22 05:36:18,241 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 05:36:18,242 INFO L225 Difference]: With dead ends: 23 [2020-08-22 05:36:18,242 INFO L226 Difference]: Without dead ends: 17 [2020-08-22 05:36:18,243 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 [2020-08-22 05:36:18,244 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-22 05:36:18,248 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-22 05:36:18,249 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-22 05:36:18,250 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2020-08-22 05:36:18,250 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 13 [2020-08-22 05:36:18,251 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 05:36:18,251 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2020-08-22 05:36:18,251 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-22 05:36:18,252 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2020-08-22 05:36:18,252 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-22 05:36:18,253 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 05:36:18,253 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 05:36:18,253 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-22 05:36:18,257 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 05:36:18,257 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 05:36:18,258 INFO L82 PathProgramCache]: Analyzing trace with hash 447870728, now seen corresponding path program 1 times [2020-08-22 05:36:18,258 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 05:36:18,262 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [295563982] [2020-08-22 05:36:18,262 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 05:36:18,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 05:36:18,508 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 05:36:18,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 05:36:18,512 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 05:36:18,512 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [295563982] [2020-08-22 05:36:18,512 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 05:36:18,512 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-22 05:36:18,513 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [805296323] [2020-08-22 05:36:18,513 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-22 05:36:18,514 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 05:36:18,514 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-22 05:36:18,514 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-22 05:36:18,514 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand 4 states. [2020-08-22 05:36:18,539 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 05:36:18,539 INFO L93 Difference]: Finished difference Result 26 states and 28 transitions. [2020-08-22 05:36:18,540 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-22 05:36:18,540 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 16 [2020-08-22 05:36:18,540 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 05:36:18,541 INFO L225 Difference]: With dead ends: 26 [2020-08-22 05:36:18,541 INFO L226 Difference]: Without dead ends: 17 [2020-08-22 05:36:18,542 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 [2020-08-22 05:36:18,542 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-22 05:36:18,545 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-22 05:36:18,545 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-22 05:36:18,546 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-08-22 05:36:18,546 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 16 [2020-08-22 05:36:18,547 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 05:36:18,547 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-08-22 05:36:18,547 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-22 05:36:18,547 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-08-22 05:36:18,547 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-22 05:36:18,548 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 05:36:18,548 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 05:36:18,548 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-22 05:36:18,548 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 05:36:18,549 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 05:36:18,550 INFO L82 PathProgramCache]: Analyzing trace with hash 1257217354, now seen corresponding path program 1 times [2020-08-22 05:36:18,551 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 05:36:18,551 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1248968361] [2020-08-22 05:36:18,551 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 05:36:18,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 05:36:18,849 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 05:36:18,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 05:36:18,858 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 05:36:18,859 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1248968361] [2020-08-22 05:36:18,859 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 05:36:18,859 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-22 05:36:18,860 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1657053382] [2020-08-22 05:36:18,860 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-22 05:36:18,860 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 05:36:18,864 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-22 05:36:18,864 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-08-22 05:36:18,864 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 7 states. [2020-08-22 05:36:18,977 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 05:36:18,978 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2020-08-22 05:36:18,978 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-22 05:36:18,978 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 16 [2020-08-22 05:36:18,979 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 05:36:18,979 INFO L225 Difference]: With dead ends: 26 [2020-08-22 05:36:18,979 INFO L226 Difference]: Without dead ends: 20 [2020-08-22 05:36:18,980 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2020-08-22 05:36:18,981 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-22 05:36:18,984 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-22 05:36:18,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-22 05:36:18,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2020-08-22 05:36:18,985 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 16 [2020-08-22 05:36:18,986 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 05:36:18,986 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2020-08-22 05:36:18,986 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-22 05:36:18,986 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2020-08-22 05:36:18,987 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-22 05:36:18,987 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 05:36:18,987 INFO L422 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 05:36:18,987 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-22 05:36:18,987 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 05:36:18,988 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 05:36:18,988 INFO L82 PathProgramCache]: Analyzing trace with hash -1335969749, now seen corresponding path program 2 times [2020-08-22 05:36:18,988 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 05:36:18,988 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1059268239] [2020-08-22 05:36:18,989 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 05:36:19,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 05:36:19,185 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 05:36:19,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 05:36:19,189 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 05:36:19,190 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1059268239] [2020-08-22 05:36:19,190 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 05:36:19,190 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-22 05:36:19,191 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2059749702] [2020-08-22 05:36:19,191 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-22 05:36:19,191 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 05:36:19,192 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-22 05:36:19,192 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-08-22 05:36:19,192 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 9 states. [2020-08-22 05:36:19,328 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 05:36:19,328 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2020-08-22 05:36:19,329 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-22 05:36:19,329 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 19 [2020-08-22 05:36:19,329 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 05:36:19,330 INFO L225 Difference]: With dead ends: 29 [2020-08-22 05:36:19,330 INFO L226 Difference]: Without dead ends: 23 [2020-08-22 05:36:19,331 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2020-08-22 05:36:19,331 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-22 05:36:19,340 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-08-22 05:36:19,340 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-22 05:36:19,341 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2020-08-22 05:36:19,341 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 19 [2020-08-22 05:36:19,341 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 05:36:19,341 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2020-08-22 05:36:19,341 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-22 05:36:19,348 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2020-08-22 05:36:19,348 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-22 05:36:19,349 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 05:36:19,349 INFO L422 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 05:36:19,349 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-22 05:36:19,349 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 05:36:19,350 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 05:36:19,351 INFO L82 PathProgramCache]: Analyzing trace with hash -1396202070, now seen corresponding path program 3 times [2020-08-22 05:36:19,351 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 05:36:19,351 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1209310244] [2020-08-22 05:36:19,351 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 05:36:19,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 05:36:19,595 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 05:36:19,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 05:36:19,600 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 05:36:19,600 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1209310244] [2020-08-22 05:36:19,600 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 05:36:19,601 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-22 05:36:19,601 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [919330750] [2020-08-22 05:36:19,601 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-22 05:36:19,602 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 05:36:19,602 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-22 05:36:19,602 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2020-08-22 05:36:19,602 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 11 states. [2020-08-22 05:36:26,049 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 05:36:26,050 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2020-08-22 05:36:26,052 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-22 05:36:26,052 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 22 [2020-08-22 05:36:26,053 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 05:36:26,053 INFO L225 Difference]: With dead ends: 32 [2020-08-22 05:36:26,054 INFO L226 Difference]: Without dead ends: 26 [2020-08-22 05:36:26,054 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=33, Invalid=147, Unknown=2, NotChecked=0, Total=182 [2020-08-22 05:36:26,055 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-22 05:36:26,061 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-08-22 05:36:26,062 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-22 05:36:26,065 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2020-08-22 05:36:26,066 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 22 [2020-08-22 05:36:26,066 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 05:36:26,066 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2020-08-22 05:36:26,066 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-22 05:36:26,066 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2020-08-22 05:36:26,069 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-22 05:36:26,069 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 05:36:26,069 INFO L422 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 05:36:26,069 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-22 05:36:26,070 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 05:36:26,070 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 05:36:26,071 INFO L82 PathProgramCache]: Analyzing trace with hash -480947253, now seen corresponding path program 4 times [2020-08-22 05:36:26,071 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 05:36:26,072 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1477347952] [2020-08-22 05:36:26,072 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 05:36:26,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 05:36:26,426 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 05:36:26,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 05:36:26,432 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 05:36:26,432 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1477347952] [2020-08-22 05:36:26,432 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 05:36:26,432 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-22 05:36:26,433 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1646909626] [2020-08-22 05:36:26,433 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-22 05:36:26,434 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 05:36:26,434 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-22 05:36:26,434 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2020-08-22 05:36:26,434 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 13 states. [2020-08-22 05:36:26,664 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 05:36:26,664 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2020-08-22 05:36:26,665 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-22 05:36:26,665 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 25 [2020-08-22 05:36:26,666 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 05:36:26,666 INFO L225 Difference]: With dead ends: 35 [2020-08-22 05:36:26,666 INFO L226 Difference]: Without dead ends: 29 [2020-08-22 05:36:26,667 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 [2020-08-22 05:36:26,668 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-22 05:36:26,672 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-08-22 05:36:26,672 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-22 05:36:26,675 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2020-08-22 05:36:26,675 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 25 [2020-08-22 05:36:26,675 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 05:36:26,675 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2020-08-22 05:36:26,675 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-22 05:36:26,675 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2020-08-22 05:36:26,681 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-22 05:36:26,681 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 05:36:26,681 INFO L422 BasicCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 05:36:26,681 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-22 05:36:26,682 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 05:36:26,682 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 05:36:26,682 INFO L82 PathProgramCache]: Analyzing trace with hash 1422910986, now seen corresponding path program 5 times [2020-08-22 05:36:26,682 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 05:36:26,683 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1419393103] [2020-08-22 05:36:26,683 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 05:36:26,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 05:36:27,197 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 05:36:27,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 05:36:27,204 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 05:36:27,204 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1419393103] [2020-08-22 05:36:27,204 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 05:36:27,204 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-22 05:36:27,205 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [575458961] [2020-08-22 05:36:27,205 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-22 05:36:27,205 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 05:36:27,206 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-22 05:36:27,206 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2020-08-22 05:36:27,206 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 15 states. [2020-08-22 05:36:31,693 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 05:36:31,694 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2020-08-22 05:36:31,694 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-22 05:36:31,694 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 28 [2020-08-22 05:36:31,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 05:36:31,695 INFO L225 Difference]: With dead ends: 38 [2020-08-22 05:36:31,695 INFO L226 Difference]: Without dead ends: 32 [2020-08-22 05:36:31,696 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=41, Invalid=264, Unknown=1, NotChecked=0, Total=306 [2020-08-22 05:36:31,696 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-22 05:36:31,705 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2020-08-22 05:36:31,705 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-08-22 05:36:31,706 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2020-08-22 05:36:31,706 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 28 [2020-08-22 05:36:31,707 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 05:36:31,707 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2020-08-22 05:36:31,707 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-22 05:36:31,707 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2020-08-22 05:36:31,708 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-22 05:36:31,708 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 05:36:31,708 INFO L422 BasicCegarLoop]: trace histogram [7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 05:36:31,708 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-22 05:36:31,708 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 05:36:31,709 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 05:36:31,709 INFO L82 PathProgramCache]: Analyzing trace with hash -74401941, now seen corresponding path program 6 times [2020-08-22 05:36:31,709 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 05:36:31,709 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [239498295] [2020-08-22 05:36:31,710 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 05:36:31,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 05:36:32,140 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 05:36:32,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 05:36:32,145 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 05:36:32,145 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [239498295] [2020-08-22 05:36:32,146 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 05:36:32,146 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-22 05:36:32,146 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1162723700] [2020-08-22 05:36:32,147 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-22 05:36:32,147 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 05:36:32,147 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-22 05:36:32,148 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2020-08-22 05:36:32,148 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 17 states. [2020-08-22 05:36:35,821 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 05:36:35,821 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2020-08-22 05:36:35,822 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-22 05:36:35,822 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 31 [2020-08-22 05:36:35,823 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 05:36:35,823 INFO L225 Difference]: With dead ends: 41 [2020-08-22 05:36:35,823 INFO L226 Difference]: Without dead ends: 35 [2020-08-22 05:36:35,825 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=45, Invalid=335, Unknown=0, NotChecked=0, Total=380 [2020-08-22 05:36:35,825 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-22 05:36:35,828 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-08-22 05:36:35,828 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-22 05:36:35,829 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2020-08-22 05:36:35,829 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 31 [2020-08-22 05:36:35,830 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 05:36:35,830 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2020-08-22 05:36:35,830 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-22 05:36:35,830 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2020-08-22 05:36:35,831 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-22 05:36:35,831 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 05:36:35,831 INFO L422 BasicCegarLoop]: trace histogram [8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 05:36:35,831 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-22 05:36:35,831 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 05:36:35,832 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 05:36:35,832 INFO L82 PathProgramCache]: Analyzing trace with hash 1006526058, now seen corresponding path program 7 times [2020-08-22 05:36:35,832 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 05:36:35,832 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [11345725] [2020-08-22 05:36:35,832 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 05:36:35,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 05:36:36,364 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 05:36:36,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 05:36:36,369 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 05:36:36,370 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [11345725] [2020-08-22 05:36:36,370 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 05:36:36,370 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-22 05:36:36,370 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1247642292] [2020-08-22 05:36:36,371 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-22 05:36:36,371 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 05:36:36,371 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-22 05:36:36,371 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=307, Unknown=0, NotChecked=0, Total=342 [2020-08-22 05:36:36,372 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 19 states. [2020-08-22 05:36:40,914 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 05:36:40,914 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2020-08-22 05:36:40,915 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-22 05:36:40,915 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 34 [2020-08-22 05:36:40,915 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 05:36:40,916 INFO L225 Difference]: With dead ends: 44 [2020-08-22 05:36:40,916 INFO L226 Difference]: Without dead ends: 38 [2020-08-22 05:36:40,917 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=49, Invalid=413, Unknown=0, NotChecked=0, Total=462 [2020-08-22 05:36:40,918 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-22 05:36:40,921 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-08-22 05:36:40,922 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-22 05:36:40,922 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2020-08-22 05:36:40,923 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 34 [2020-08-22 05:36:40,923 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 05:36:40,923 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2020-08-22 05:36:40,923 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-22 05:36:40,923 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2020-08-22 05:36:40,924 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-22 05:36:40,924 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 05:36:40,924 INFO L422 BasicCegarLoop]: trace histogram [9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 05:36:40,925 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-22 05:36:40,925 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 05:36:40,925 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 05:36:40,925 INFO L82 PathProgramCache]: Analyzing trace with hash -732241141, now seen corresponding path program 8 times [2020-08-22 05:36:40,925 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 05:36:40,926 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1733927143] [2020-08-22 05:36:40,926 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 05:36:40,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 05:36:41,495 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 05:36:41,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 05:36:41,502 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 05:36:41,503 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1733927143] [2020-08-22 05:36:41,503 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 05:36:41,503 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-22 05:36:41,503 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [158475135] [2020-08-22 05:36:41,504 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-22 05:36:41,504 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 05:36:41,504 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-22 05:36:41,505 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=381, Unknown=0, NotChecked=0, Total=420 [2020-08-22 05:36:41,505 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 21 states. [2020-08-22 05:36:41,972 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 05:36:41,972 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2020-08-22 05:36:41,974 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-22 05:36:41,974 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 37 [2020-08-22 05:36:41,974 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 05:36:41,975 INFO L225 Difference]: With dead ends: 47 [2020-08-22 05:36:41,975 INFO L226 Difference]: Without dead ends: 41 [2020-08-22 05:36:41,976 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=53, Invalid=499, Unknown=0, NotChecked=0, Total=552 [2020-08-22 05:36:41,976 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-22 05:36:41,979 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-08-22 05:36:41,979 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-22 05:36:41,980 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2020-08-22 05:36:41,980 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 37 [2020-08-22 05:36:41,980 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 05:36:41,980 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2020-08-22 05:36:41,980 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-22 05:36:41,981 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2020-08-22 05:36:41,981 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-22 05:36:41,982 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 05:36:41,982 INFO L422 BasicCegarLoop]: trace histogram [10, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 05:36:41,982 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-22 05:36:41,982 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 05:36:41,982 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 05:36:41,983 INFO L82 PathProgramCache]: Analyzing trace with hash 1254690506, now seen corresponding path program 9 times [2020-08-22 05:36:41,983 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 05:36:41,983 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [250908794] [2020-08-22 05:36:41,983 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 05:36:42,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 05:36:42,765 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 05:36:42,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 05:36:42,775 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 05:36:42,776 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [250908794] [2020-08-22 05:36:42,776 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 05:36:42,776 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-22 05:36:42,777 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1170066253] [2020-08-22 05:36:42,777 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-22 05:36:42,778 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 05:36:42,778 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-22 05:36:42,779 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=463, Unknown=0, NotChecked=0, Total=506 [2020-08-22 05:36:42,779 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 23 states. [2020-08-22 05:36:55,778 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 05:36:55,778 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2020-08-22 05:36:55,781 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-22 05:36:55,781 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 40 [2020-08-22 05:36:55,781 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 05:36:55,782 INFO L225 Difference]: With dead ends: 50 [2020-08-22 05:36:55,782 INFO L226 Difference]: Without dead ends: 44 [2020-08-22 05:36:55,783 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 7.0s TimeCoverageRelationStatistics Valid=57, Invalid=590, Unknown=3, NotChecked=0, Total=650 [2020-08-22 05:36:55,783 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-22 05:36:55,786 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-08-22 05:36:55,787 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-22 05:36:55,787 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2020-08-22 05:36:55,787 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 40 [2020-08-22 05:36:55,788 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 05:36:55,788 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2020-08-22 05:36:55,788 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-22 05:36:55,788 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2020-08-22 05:36:55,789 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-22 05:36:55,789 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 05:36:55,789 INFO L422 BasicCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 05:36:55,790 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-22 05:36:55,790 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 05:36:55,790 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 05:36:55,790 INFO L82 PathProgramCache]: Analyzing trace with hash 696112811, now seen corresponding path program 10 times [2020-08-22 05:36:55,790 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 05:36:55,791 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [619987230] [2020-08-22 05:36:55,791 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 05:36:55,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 05:36:56,570 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 05:36:56,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 05:36:56,578 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 05:36:56,578 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [619987230] [2020-08-22 05:36:56,579 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 05:36:56,579 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-22 05:36:56,579 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1924065010] [2020-08-22 05:36:56,579 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-22 05:36:56,580 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 05:36:56,580 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-22 05:36:56,580 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=553, Unknown=0, NotChecked=0, Total=600 [2020-08-22 05:36:56,580 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 25 states. [2020-08-22 05:37:11,808 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 05:37:11,808 INFO L93 Difference]: Finished difference Result 53 states and 53 transitions. [2020-08-22 05:37:11,809 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-22 05:37:11,809 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 43 [2020-08-22 05:37:11,810 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 05:37:11,810 INFO L225 Difference]: With dead ends: 53 [2020-08-22 05:37:11,811 INFO L226 Difference]: Without dead ends: 47 [2020-08-22 05:37:11,812 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 11.2s TimeCoverageRelationStatistics Valid=61, Invalid=690, Unknown=5, NotChecked=0, Total=756 [2020-08-22 05:37:11,813 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-22 05:37:11,816 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2020-08-22 05:37:11,816 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-22 05:37:11,817 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2020-08-22 05:37:11,817 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 43 [2020-08-22 05:37:11,817 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 05:37:11,817 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2020-08-22 05:37:11,818 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-22 05:37:11,818 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2020-08-22 05:37:11,818 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-22 05:37:11,818 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 05:37:11,819 INFO L422 BasicCegarLoop]: trace histogram [12, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 05:37:11,819 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-22 05:37:11,819 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 05:37:11,819 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 05:37:11,819 INFO L82 PathProgramCache]: Analyzing trace with hash -1188694230, now seen corresponding path program 11 times [2020-08-22 05:37:11,820 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 05:37:11,820 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1547531535] [2020-08-22 05:37:11,820 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 05:37:11,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 05:37:12,778 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 05:37:12,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 05:37:12,788 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 05:37:12,788 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1547531535] [2020-08-22 05:37:12,789 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 05:37:12,789 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-22 05:37:12,789 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1200199149] [2020-08-22 05:37:12,789 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-22 05:37:12,790 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 05:37:12,790 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-22 05:37:12,791 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=651, Unknown=0, NotChecked=0, Total=702 [2020-08-22 05:37:12,791 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 27 states. [2020-08-22 05:37:23,806 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 05:37:23,806 INFO L93 Difference]: Finished difference Result 56 states and 56 transitions. [2020-08-22 05:37:23,806 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-22 05:37:23,806 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 46 [2020-08-22 05:37:23,807 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 05:37:23,807 INFO L225 Difference]: With dead ends: 56 [2020-08-22 05:37:23,807 INFO L226 Difference]: Without dead ends: 50 [2020-08-22 05:37:23,808 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=65, Invalid=803, Unknown=2, NotChecked=0, Total=870 [2020-08-22 05:37:23,809 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-08-22 05:37:23,818 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2020-08-22 05:37:23,818 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-08-22 05:37:23,819 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 50 transitions. [2020-08-22 05:37:23,823 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 50 transitions. Word has length 46 [2020-08-22 05:37:23,823 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 05:37:23,823 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 50 transitions. [2020-08-22 05:37:23,823 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-22 05:37:23,823 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 50 transitions. [2020-08-22 05:37:23,824 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-08-22 05:37:23,824 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 05:37:23,824 INFO L422 BasicCegarLoop]: trace histogram [13, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 05:37:23,826 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-22 05:37:23,827 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 05:37:23,827 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 05:37:23,827 INFO L82 PathProgramCache]: Analyzing trace with hash 927175243, now seen corresponding path program 12 times [2020-08-22 05:37:23,827 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 05:37:23,828 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [86694446] [2020-08-22 05:37:23,828 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 05:37:23,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 05:37:24,935 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 05:37:24,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 05:37:24,947 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 05:37:24,947 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [86694446] [2020-08-22 05:37:24,947 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 05:37:24,948 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-22 05:37:24,948 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2011876721] [2020-08-22 05:37:24,948 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-22 05:37:24,948 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 05:37:24,949 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-22 05:37:24,949 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=757, Unknown=0, NotChecked=0, Total=812 [2020-08-22 05:37:24,949 INFO L87 Difference]: Start difference. First operand 50 states and 50 transitions. Second operand 29 states.