/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=LOWLEXORDER --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/array-lopstr16/flag_loopdep.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 18:15:15,650 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 18:15:15,652 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 18:15:15,676 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 18:15:15,676 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 18:15:15,677 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 18:15:15,678 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 18:15:15,680 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 18:15:15,682 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 18:15:15,682 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 18:15:15,683 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 18:15:15,684 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 18:15:15,685 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 18:15:15,686 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 18:15:15,687 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 18:15:15,688 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 18:15:15,688 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 18:15:15,689 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 18:15:15,691 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 18:15:15,692 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 18:15:15,694 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 18:15:15,695 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 18:15:15,696 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 18:15:15,696 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 18:15:15,699 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-21 18:15:15,706 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 18:15:15,706 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 18:15:15,707 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 18:15:15,708 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 [2020-08-21 18:15:15,751 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 18:15:15,751 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 18:15:15,752 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 18:15:15,752 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 18:15:15,752 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 18:15:15,753 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 18:15:15,753 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 18:15:15,753 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 18:15:15,753 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 18:15:15,753 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 18:15:15,754 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 18:15:15,754 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 18:15:15,755 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 18:15:15,755 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 18:15:15,755 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 18:15:15,755 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 18:15:15,755 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 18:15:15,756 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 18:15:15,756 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 18:15:15,756 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 18:15:15,756 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 18:15:15,756 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 18:15:15,757 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 18:15:15,759 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 18:15:15,759 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 18:15:15,759 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 18:15:15,759 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 18:15:15,759 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 18:15:15,760 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 18:15:15,760 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=LOWLEXORDER;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=LOWLEXORDER;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=LOWLEXORDER;log-additional-information=true; [2020-08-21 18:15:16,044 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 18:15:16,056 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 18:15:16,059 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 18:15:16,061 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 18:15:16,061 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 18:15:16,062 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-lopstr16/flag_loopdep.i [2020-08-21 18:15:16,129 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/08022b082/4d7555d2b4bf44d2b0ec26bc1d0727e8/FLAGdac244612 [2020-08-21 18:15:16,545 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 18:15:16,546 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/array-lopstr16/flag_loopdep.i [2020-08-21 18:15:16,552 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/08022b082/4d7555d2b4bf44d2b0ec26bc1d0727e8/FLAGdac244612 [2020-08-21 18:15:16,946 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/08022b082/4d7555d2b4bf44d2b0ec26bc1d0727e8 [2020-08-21 18:15:16,957 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 18:15:16,960 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 18:15:16,963 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 18:15:16,963 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 18:15:16,966 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 18:15:16,968 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 06:15:16" (1/1) ... [2020-08-21 18:15:16,971 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@722dc2de and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:15:16, skipping insertion in model container [2020-08-21 18:15:16,971 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 06:15:16" (1/1) ... [2020-08-21 18:15:16,980 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 18:15:17,000 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 18:15:17,295 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 18:15:17,303 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 18:15:17,329 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 18:15:17,348 INFO L208 MainTranslator]: Completed translation [2020-08-21 18:15:17,349 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:15:17 WrapperNode [2020-08-21 18:15:17,350 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 18:15:17,350 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 18:15:17,350 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 18:15:17,351 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 18:15:17,486 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:15:17" (1/1) ... [2020-08-21 18:15:17,486 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:15:17" (1/1) ... [2020-08-21 18:15:17,496 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:15:17" (1/1) ... [2020-08-21 18:15:17,496 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:15:17" (1/1) ... [2020-08-21 18:15:17,504 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:15:17" (1/1) ... [2020-08-21 18:15:17,510 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:15:17" (1/1) ... [2020-08-21 18:15:17,511 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:15:17" (1/1) ... [2020-08-21 18:15:17,513 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 18:15:17,514 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 18:15:17,514 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 18:15:17,514 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 18:15:17,515 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:15:17" (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 [2020-08-21 18:15:17,580 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 18:15:17,580 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 18:15:17,581 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-21 18:15:17,581 INFO L138 BoogieDeclarations]: Found implementation of procedure init [2020-08-21 18:15:17,581 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 18:15:17,582 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 18:15:17,582 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-21 18:15:17,582 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2020-08-21 18:15:17,583 INFO L130 BoogieDeclarations]: Found specification of procedure nondet_pointer [2020-08-21 18:15:17,583 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-08-21 18:15:17,584 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-08-21 18:15:17,584 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-08-21 18:15:17,584 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 18:15:17,584 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-21 18:15:17,584 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-08-21 18:15:17,585 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-21 18:15:17,585 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 18:15:17,585 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 18:15:17,825 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 18:15:17,825 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-08-21 18:15:17,828 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 06:15:17 BoogieIcfgContainer [2020-08-21 18:15:17,829 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 18:15:17,830 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 18:15:17,830 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 18:15:17,833 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 18:15:17,834 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 06:15:16" (1/3) ... [2020-08-21 18:15:17,834 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5164fe84 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 06:15:17, skipping insertion in model container [2020-08-21 18:15:17,835 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:15:17" (2/3) ... [2020-08-21 18:15:17,835 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5164fe84 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 06:15:17, skipping insertion in model container [2020-08-21 18:15:17,835 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 06:15:17" (3/3) ... [2020-08-21 18:15:17,837 INFO L109 eAbstractionObserver]: Analyzing ICFG flag_loopdep.i [2020-08-21 18:15:17,848 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 18:15:17,855 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 18:15:17,877 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 18:15:17,937 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 18:15:17,937 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 18:15:17,937 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 18:15:17,937 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 18:15:17,937 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 18:15:17,937 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 18:15:17,938 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 18:15:17,938 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 18:15:17,967 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-08-21 18:15:17,978 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-21 18:15:17,979 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:15:17,985 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:15:17,985 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:15:17,990 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:15:17,991 INFO L82 PathProgramCache]: Analyzing trace with hash 1059974619, now seen corresponding path program 1 times [2020-08-21 18:15:18,000 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:15:18,001 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1353390064] [2020-08-21 18:15:18,001 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:15:18,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:18,182 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:15:18,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:18,212 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 18:15:18,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:18,237 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:15:18,238 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1353390064] [2020-08-21 18:15:18,240 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 18:15:18,240 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-21 18:15:18,241 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1902565173] [2020-08-21 18:15:18,246 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 18:15:18,246 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:15:18,260 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 18:15:18,260 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 18:15:18,262 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 4 states. [2020-08-21 18:15:18,393 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:15:18,394 INFO L93 Difference]: Finished difference Result 59 states and 76 transitions. [2020-08-21 18:15:18,394 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 18:15:18,396 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 20 [2020-08-21 18:15:18,396 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:15:18,406 INFO L225 Difference]: With dead ends: 59 [2020-08-21 18:15:18,407 INFO L226 Difference]: Without dead ends: 31 [2020-08-21 18:15:18,410 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-21 18:15:18,424 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-21 18:15:18,443 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 28. [2020-08-21 18:15:18,444 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-21 18:15:18,445 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 32 transitions. [2020-08-21 18:15:18,447 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 32 transitions. Word has length 20 [2020-08-21 18:15:18,447 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:15:18,447 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 32 transitions. [2020-08-21 18:15:18,448 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 18:15:18,448 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 32 transitions. [2020-08-21 18:15:18,449 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-21 18:15:18,449 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:15:18,449 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:15:18,450 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 18:15:18,450 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:15:18,450 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:15:18,451 INFO L82 PathProgramCache]: Analyzing trace with hash -931069882, now seen corresponding path program 1 times [2020-08-21 18:15:18,451 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:15:18,452 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1646455572] [2020-08-21 18:15:18,452 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:15:18,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:18,538 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:15:18,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:18,558 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 18:15:18,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:18,628 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:15:18,628 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1646455572] [2020-08-21 18:15:18,629 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 18:15:18,629 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-08-21 18:15:18,629 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [354200355] [2020-08-21 18:15:18,631 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 18:15:18,631 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:15:18,631 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 18:15:18,632 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-08-21 18:15:18,632 INFO L87 Difference]: Start difference. First operand 28 states and 32 transitions. Second operand 6 states. [2020-08-21 18:15:18,825 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:15:18,825 INFO L93 Difference]: Finished difference Result 48 states and 56 transitions. [2020-08-21 18:15:18,826 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 18:15:18,826 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2020-08-21 18:15:18,826 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:15:18,827 INFO L225 Difference]: With dead ends: 48 [2020-08-21 18:15:18,828 INFO L226 Difference]: Without dead ends: 30 [2020-08-21 18:15:18,829 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2020-08-21 18:15:18,830 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-21 18:15:18,836 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2020-08-21 18:15:18,836 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-21 18:15:18,854 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2020-08-21 18:15:18,855 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 20 [2020-08-21 18:15:18,855 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:15:18,855 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2020-08-21 18:15:18,855 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 18:15:18,855 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2020-08-21 18:15:18,856 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-21 18:15:18,856 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:15:18,856 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:15:18,857 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 18:15:18,857 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:15:18,857 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:15:18,858 INFO L82 PathProgramCache]: Analyzing trace with hash 1782065480, now seen corresponding path program 1 times [2020-08-21 18:15:18,858 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:15:18,858 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1499904516] [2020-08-21 18:15:18,858 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:15:18,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:18,907 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:15:18,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:18,923 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 18:15:18,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:19,017 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:15:19,017 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1499904516] [2020-08-21 18:15:19,017 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:15:19,018 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 18:15:19,018 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1849611587] [2020-08-21 18:15:19,018 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 18:15:19,019 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:15:19,019 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 18:15:19,019 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-08-21 18:15:19,019 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand 7 states. [2020-08-21 18:15:19,170 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:15:19,171 INFO L93 Difference]: Finished difference Result 50 states and 58 transitions. [2020-08-21 18:15:19,171 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 18:15:19,171 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 22 [2020-08-21 18:15:19,172 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:15:19,173 INFO L225 Difference]: With dead ends: 50 [2020-08-21 18:15:19,173 INFO L226 Difference]: Without dead ends: 32 [2020-08-21 18:15:19,174 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2020-08-21 18:15:19,174 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-21 18:15:19,179 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2020-08-21 18:15:19,179 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-21 18:15:19,180 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 35 transitions. [2020-08-21 18:15:19,181 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 35 transitions. Word has length 22 [2020-08-21 18:15:19,181 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:15:19,181 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 35 transitions. [2020-08-21 18:15:19,181 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 18:15:19,181 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 35 transitions. [2020-08-21 18:15:19,182 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-21 18:15:19,182 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:15:19,182 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:15:19,183 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 18:15:19,183 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:15:19,183 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:15:19,183 INFO L82 PathProgramCache]: Analyzing trace with hash 2059999690, now seen corresponding path program 2 times [2020-08-21 18:15:19,184 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:15:19,184 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1403222330] [2020-08-21 18:15:19,184 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:15:19,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:19,239 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:15:19,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:19,253 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 18:15:19,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:19,390 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:15:19,391 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1403222330] [2020-08-21 18:15:19,391 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:15:19,391 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 18:15:19,391 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [776853755] [2020-08-21 18:15:19,392 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 18:15:19,392 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:15:19,392 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 18:15:19,393 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2020-08-21 18:15:19,393 INFO L87 Difference]: Start difference. First operand 31 states and 35 transitions. Second operand 8 states. [2020-08-21 18:15:19,570 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:15:19,571 INFO L93 Difference]: Finished difference Result 52 states and 60 transitions. [2020-08-21 18:15:19,571 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-21 18:15:19,571 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 24 [2020-08-21 18:15:19,572 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:15:19,572 INFO L225 Difference]: With dead ends: 52 [2020-08-21 18:15:19,572 INFO L226 Difference]: Without dead ends: 34 [2020-08-21 18:15:19,573 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2020-08-21 18:15:19,574 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-21 18:15:19,578 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2020-08-21 18:15:19,578 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-21 18:15:19,579 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 37 transitions. [2020-08-21 18:15:19,579 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 37 transitions. Word has length 24 [2020-08-21 18:15:19,580 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:15:19,580 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 37 transitions. [2020-08-21 18:15:19,580 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 18:15:19,580 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 37 transitions. [2020-08-21 18:15:19,581 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-21 18:15:19,581 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:15:19,581 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:15:19,582 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 18:15:19,582 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:15:19,582 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:15:19,582 INFO L82 PathProgramCache]: Analyzing trace with hash -1428164148, now seen corresponding path program 3 times [2020-08-21 18:15:19,583 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:15:19,583 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1524509666] [2020-08-21 18:15:19,583 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:15:19,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:19,623 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:15:19,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:19,641 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 18:15:19,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:19,851 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:15:19,851 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1524509666] [2020-08-21 18:15:19,851 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:15:19,852 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 18:15:19,852 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1668342120] [2020-08-21 18:15:19,853 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 18:15:19,853 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:15:19,853 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 18:15:19,853 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-21 18:15:19,854 INFO L87 Difference]: Start difference. First operand 33 states and 37 transitions. Second operand 9 states. [2020-08-21 18:15:20,014 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:15:20,015 INFO L93 Difference]: Finished difference Result 54 states and 62 transitions. [2020-08-21 18:15:20,015 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 18:15:20,015 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-08-21 18:15:20,016 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:15:20,016 INFO L225 Difference]: With dead ends: 54 [2020-08-21 18:15:20,016 INFO L226 Difference]: Without dead ends: 36 [2020-08-21 18:15:20,017 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=41, Invalid=91, Unknown=0, NotChecked=0, Total=132 [2020-08-21 18:15:20,017 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-21 18:15:20,022 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2020-08-21 18:15:20,022 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-21 18:15:20,023 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2020-08-21 18:15:20,023 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 26 [2020-08-21 18:15:20,023 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:15:20,023 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2020-08-21 18:15:20,023 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 18:15:20,024 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2020-08-21 18:15:20,024 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-21 18:15:20,024 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:15:20,025 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:15:20,025 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 18:15:20,025 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:15:20,025 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:15:20,025 INFO L82 PathProgramCache]: Analyzing trace with hash 815845710, now seen corresponding path program 4 times [2020-08-21 18:15:20,026 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:15:20,026 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [986582379] [2020-08-21 18:15:20,026 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:15:20,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:20,062 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:15:20,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:20,076 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 18:15:20,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:20,253 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:15:20,254 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [986582379] [2020-08-21 18:15:20,254 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:15:20,254 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-21 18:15:20,255 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1983155602] [2020-08-21 18:15:20,255 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 18:15:20,255 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:15:20,256 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 18:15:20,256 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2020-08-21 18:15:20,256 INFO L87 Difference]: Start difference. First operand 35 states and 39 transitions. Second operand 10 states. [2020-08-21 18:15:20,435 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:15:20,435 INFO L93 Difference]: Finished difference Result 56 states and 64 transitions. [2020-08-21 18:15:20,436 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 18:15:20,436 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 28 [2020-08-21 18:15:20,436 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:15:20,437 INFO L225 Difference]: With dead ends: 56 [2020-08-21 18:15:20,437 INFO L226 Difference]: Without dead ends: 38 [2020-08-21 18:15:20,438 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=49, Invalid=107, Unknown=0, NotChecked=0, Total=156 [2020-08-21 18:15:20,438 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-21 18:15:20,442 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2020-08-21 18:15:20,442 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-21 18:15:20,443 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 41 transitions. [2020-08-21 18:15:20,443 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 41 transitions. Word has length 28 [2020-08-21 18:15:20,444 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:15:20,444 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 41 transitions. [2020-08-21 18:15:20,444 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 18:15:20,444 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 41 transitions. [2020-08-21 18:15:20,445 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-21 18:15:20,445 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:15:20,445 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:15:20,445 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 18:15:20,446 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:15:20,446 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:15:20,446 INFO L82 PathProgramCache]: Analyzing trace with hash 1235736656, now seen corresponding path program 5 times [2020-08-21 18:15:20,446 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:15:20,446 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2044009169] [2020-08-21 18:15:20,447 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:15:20,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:20,479 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:15:20,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:20,494 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 18:15:20,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:20,737 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:15:20,737 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2044009169] [2020-08-21 18:15:20,738 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:15:20,738 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-21 18:15:20,738 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1402660420] [2020-08-21 18:15:20,738 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 18:15:20,739 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:15:20,739 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 18:15:20,739 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2020-08-21 18:15:20,739 INFO L87 Difference]: Start difference. First operand 37 states and 41 transitions. Second operand 11 states. [2020-08-21 18:15:20,924 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:15:20,925 INFO L93 Difference]: Finished difference Result 58 states and 66 transitions. [2020-08-21 18:15:20,925 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-21 18:15:20,925 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 30 [2020-08-21 18:15:20,926 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:15:20,927 INFO L225 Difference]: With dead ends: 58 [2020-08-21 18:15:20,927 INFO L226 Difference]: Without dead ends: 40 [2020-08-21 18:15:20,928 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=58, Invalid=124, Unknown=0, NotChecked=0, Total=182 [2020-08-21 18:15:20,929 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-21 18:15:20,933 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2020-08-21 18:15:20,933 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-21 18:15:20,934 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 43 transitions. [2020-08-21 18:15:20,934 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 43 transitions. Word has length 30 [2020-08-21 18:15:20,934 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:15:20,935 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 43 transitions. [2020-08-21 18:15:20,935 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 18:15:20,935 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 43 transitions. [2020-08-21 18:15:20,936 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-21 18:15:20,936 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:15:20,936 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:15:20,936 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 18:15:20,936 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:15:20,937 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:15:20,937 INFO L82 PathProgramCache]: Analyzing trace with hash 1024009938, now seen corresponding path program 6 times [2020-08-21 18:15:20,937 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:15:20,937 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1842080655] [2020-08-21 18:15:20,938 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:15:20,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:20,972 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:15:20,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:20,983 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 18:15:20,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:21,247 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:15:21,248 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1842080655] [2020-08-21 18:15:21,248 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:15:21,248 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-21 18:15:21,248 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [64637360] [2020-08-21 18:15:21,249 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-21 18:15:21,249 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:15:21,249 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-21 18:15:21,249 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=90, Unknown=0, NotChecked=0, Total=132 [2020-08-21 18:15:21,250 INFO L87 Difference]: Start difference. First operand 39 states and 43 transitions. Second operand 12 states. [2020-08-21 18:15:21,454 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:15:21,454 INFO L93 Difference]: Finished difference Result 60 states and 68 transitions. [2020-08-21 18:15:21,454 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-21 18:15:21,454 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 32 [2020-08-21 18:15:21,455 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:15:21,455 INFO L225 Difference]: With dead ends: 60 [2020-08-21 18:15:21,456 INFO L226 Difference]: Without dead ends: 42 [2020-08-21 18:15:21,456 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=68, Invalid=142, Unknown=0, NotChecked=0, Total=210 [2020-08-21 18:15:21,460 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-21 18:15:21,468 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2020-08-21 18:15:21,469 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-21 18:15:21,469 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 45 transitions. [2020-08-21 18:15:21,469 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 45 transitions. Word has length 32 [2020-08-21 18:15:21,470 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:15:21,470 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 45 transitions. [2020-08-21 18:15:21,470 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-21 18:15:21,470 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 45 transitions. [2020-08-21 18:15:21,474 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-21 18:15:21,474 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:15:21,474 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:15:21,474 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-21 18:15:21,474 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:15:21,475 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:15:21,475 INFO L82 PathProgramCache]: Analyzing trace with hash -581903148, now seen corresponding path program 7 times [2020-08-21 18:15:21,475 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:15:21,475 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2010277912] [2020-08-21 18:15:21,476 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:15:21,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:21,526 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:15:21,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:21,547 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 18:15:21,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:21,854 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:15:21,855 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2010277912] [2020-08-21 18:15:21,855 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:15:21,855 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 18:15:21,855 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1091734715] [2020-08-21 18:15:21,856 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 18:15:21,856 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:15:21,856 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 18:15:21,857 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=105, Unknown=0, NotChecked=0, Total=156 [2020-08-21 18:15:21,857 INFO L87 Difference]: Start difference. First operand 41 states and 45 transitions. Second operand 13 states. [2020-08-21 18:15:22,069 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:15:22,069 INFO L93 Difference]: Finished difference Result 62 states and 70 transitions. [2020-08-21 18:15:22,070 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-21 18:15:22,070 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 34 [2020-08-21 18:15:22,070 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:15:22,071 INFO L225 Difference]: With dead ends: 62 [2020-08-21 18:15:22,072 INFO L226 Difference]: Without dead ends: 44 [2020-08-21 18:15:22,072 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=79, Invalid=161, Unknown=0, NotChecked=0, Total=240 [2020-08-21 18:15:22,073 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-21 18:15:22,080 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2020-08-21 18:15:22,080 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-21 18:15:22,081 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 47 transitions. [2020-08-21 18:15:22,081 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 47 transitions. Word has length 34 [2020-08-21 18:15:22,081 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:15:22,081 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 47 transitions. [2020-08-21 18:15:22,081 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 18:15:22,081 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 47 transitions. [2020-08-21 18:15:22,083 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-21 18:15:22,083 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:15:22,083 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:15:22,084 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-21 18:15:22,084 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:15:22,084 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:15:22,084 INFO L82 PathProgramCache]: Analyzing trace with hash -1971119530, now seen corresponding path program 8 times [2020-08-21 18:15:22,085 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:15:22,085 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2050027616] [2020-08-21 18:15:22,085 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:15:22,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:22,115 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:15:22,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:22,127 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 18:15:22,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:22,460 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:15:22,460 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2050027616] [2020-08-21 18:15:22,460 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:15:22,461 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-21 18:15:22,461 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [744027172] [2020-08-21 18:15:22,461 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-21 18:15:22,461 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:15:22,462 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-21 18:15:22,462 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2020-08-21 18:15:22,462 INFO L87 Difference]: Start difference. First operand 43 states and 47 transitions. Second operand 14 states. [2020-08-21 18:15:22,681 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:15:22,681 INFO L93 Difference]: Finished difference Result 64 states and 72 transitions. [2020-08-21 18:15:22,681 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-21 18:15:22,682 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 36 [2020-08-21 18:15:22,682 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:15:22,682 INFO L225 Difference]: With dead ends: 64 [2020-08-21 18:15:22,682 INFO L226 Difference]: Without dead ends: 46 [2020-08-21 18:15:22,683 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=91, Invalid=181, Unknown=0, NotChecked=0, Total=272 [2020-08-21 18:15:22,683 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-21 18:15:22,688 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2020-08-21 18:15:22,688 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-21 18:15:22,689 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 49 transitions. [2020-08-21 18:15:22,689 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 49 transitions. Word has length 36 [2020-08-21 18:15:22,689 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:15:22,689 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 49 transitions. [2020-08-21 18:15:22,690 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-21 18:15:22,690 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 49 transitions. [2020-08-21 18:15:22,690 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-21 18:15:22,691 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:15:22,691 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:15:22,691 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-21 18:15:22,691 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:15:22,691 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:15:22,691 INFO L82 PathProgramCache]: Analyzing trace with hash -1273233576, now seen corresponding path program 9 times [2020-08-21 18:15:22,692 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:15:22,692 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [470624158] [2020-08-21 18:15:22,692 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:15:22,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:22,726 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:15:22,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:22,738 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 18:15:22,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:22,749 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2020-08-21 18:15:22,750 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [470624158] [2020-08-21 18:15:22,750 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 18:15:22,750 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-21 18:15:22,751 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [454561142] [2020-08-21 18:15:22,751 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 18:15:22,751 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:15:22,752 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 18:15:22,752 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-21 18:15:22,752 INFO L87 Difference]: Start difference. First operand 45 states and 49 transitions. Second operand 5 states. [2020-08-21 18:15:22,833 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:15:22,833 INFO L93 Difference]: Finished difference Result 65 states and 74 transitions. [2020-08-21 18:15:22,834 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-21 18:15:22,834 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 38 [2020-08-21 18:15:22,834 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:15:22,836 INFO L225 Difference]: With dead ends: 65 [2020-08-21 18:15:22,836 INFO L226 Difference]: Without dead ends: 53 [2020-08-21 18:15:22,837 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-21 18:15:22,837 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-08-21 18:15:22,845 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 46. [2020-08-21 18:15:22,845 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-21 18:15:22,845 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 50 transitions. [2020-08-21 18:15:22,846 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 50 transitions. Word has length 38 [2020-08-21 18:15:22,846 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:15:22,846 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 50 transitions. [2020-08-21 18:15:22,846 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 18:15:22,846 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 50 transitions. [2020-08-21 18:15:22,847 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-21 18:15:22,847 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:15:22,847 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:15:22,848 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-21 18:15:22,848 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:15:22,848 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:15:22,848 INFO L82 PathProgramCache]: Analyzing trace with hash -1053921041, now seen corresponding path program 1 times [2020-08-21 18:15:22,848 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:15:22,849 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1929057183] [2020-08-21 18:15:22,849 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:15:22,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:22,885 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:15:22,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:22,897 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 18:15:22,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:22,909 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2020-08-21 18:15:22,909 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1929057183] [2020-08-21 18:15:22,910 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:15:22,910 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-21 18:15:22,910 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [433881814] [2020-08-21 18:15:22,910 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 18:15:22,911 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:15:22,911 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 18:15:22,911 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-08-21 18:15:22,911 INFO L87 Difference]: Start difference. First operand 46 states and 50 transitions. Second operand 6 states. [2020-08-21 18:15:23,001 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:15:23,002 INFO L93 Difference]: Finished difference Result 73 states and 85 transitions. [2020-08-21 18:15:23,002 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 18:15:23,002 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 41 [2020-08-21 18:15:23,003 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:15:23,003 INFO L225 Difference]: With dead ends: 73 [2020-08-21 18:15:23,003 INFO L226 Difference]: Without dead ends: 61 [2020-08-21 18:15:23,004 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-08-21 18:15:23,004 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-08-21 18:15:23,008 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 49. [2020-08-21 18:15:23,008 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-21 18:15:23,009 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 54 transitions. [2020-08-21 18:15:23,009 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 54 transitions. Word has length 41 [2020-08-21 18:15:23,009 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:15:23,010 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 54 transitions. [2020-08-21 18:15:23,010 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 18:15:23,010 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 54 transitions. [2020-08-21 18:15:23,010 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-21 18:15:23,011 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:15:23,011 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:15:23,011 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-21 18:15:23,011 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:15:23,011 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:15:23,011 INFO L82 PathProgramCache]: Analyzing trace with hash -159448072, now seen corresponding path program 2 times [2020-08-21 18:15:23,012 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:15:23,012 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [642933964] [2020-08-21 18:15:23,012 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:15:23,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:23,047 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:15:23,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:23,060 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 18:15:23,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:23,070 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 83 trivial. 0 not checked. [2020-08-21 18:15:23,071 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [642933964] [2020-08-21 18:15:23,071 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 18:15:23,071 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-21 18:15:23,071 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1449735237] [2020-08-21 18:15:23,072 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 18:15:23,072 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:15:23,072 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 18:15:23,072 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-21 18:15:23,073 INFO L87 Difference]: Start difference. First operand 49 states and 54 transitions. Second operand 5 states. [2020-08-21 18:15:23,145 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:15:23,146 INFO L93 Difference]: Finished difference Result 69 states and 78 transitions. [2020-08-21 18:15:23,146 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-21 18:15:23,146 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 44 [2020-08-21 18:15:23,147 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:15:23,147 INFO L225 Difference]: With dead ends: 69 [2020-08-21 18:15:23,147 INFO L226 Difference]: Without dead ends: 49 [2020-08-21 18:15:23,148 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-21 18:15:23,148 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-21 18:15:23,159 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-21 18:15:23,160 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-21 18:15:23,160 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 52 transitions. [2020-08-21 18:15:23,160 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 52 transitions. Word has length 44 [2020-08-21 18:15:23,161 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:15:23,161 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 52 transitions. [2020-08-21 18:15:23,161 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 18:15:23,161 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 52 transitions. [2020-08-21 18:15:23,162 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-21 18:15:23,163 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:15:23,164 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:15:23,164 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-21 18:15:23,164 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:15:23,174 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:15:23,175 INFO L82 PathProgramCache]: Analyzing trace with hash -1139281096, now seen corresponding path program 1 times [2020-08-21 18:15:23,175 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:15:23,175 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1842129241] [2020-08-21 18:15:23,175 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:15:23,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:23,225 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:15:23,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:23,236 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 18:15:23,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:23,644 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 18:15:23,644 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1842129241] [2020-08-21 18:15:23,645 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:15:23,645 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-21 18:15:23,645 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1122589440] [2020-08-21 18:15:23,646 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-21 18:15:23,646 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:15:23,647 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-21 18:15:23,647 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=138, Unknown=0, NotChecked=0, Total=210 [2020-08-21 18:15:23,647 INFO L87 Difference]: Start difference. First operand 49 states and 52 transitions. Second operand 15 states. [2020-08-21 18:15:23,855 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:15:23,856 INFO L93 Difference]: Finished difference Result 74 states and 80 transitions. [2020-08-21 18:15:23,856 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-21 18:15:23,856 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 44 [2020-08-21 18:15:23,857 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:15:23,857 INFO L225 Difference]: With dead ends: 74 [2020-08-21 18:15:23,857 INFO L226 Difference]: Without dead ends: 52 [2020-08-21 18:15:23,858 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=104, Invalid=202, Unknown=0, NotChecked=0, Total=306 [2020-08-21 18:15:23,858 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-21 18:15:23,867 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2020-08-21 18:15:23,867 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-21 18:15:23,867 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 54 transitions. [2020-08-21 18:15:23,872 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 54 transitions. Word has length 44 [2020-08-21 18:15:23,872 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:15:23,872 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 54 transitions. [2020-08-21 18:15:23,872 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-21 18:15:23,872 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 54 transitions. [2020-08-21 18:15:23,873 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-21 18:15:23,873 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:15:23,873 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:15:23,873 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-21 18:15:23,873 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:15:23,874 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:15:23,874 INFO L82 PathProgramCache]: Analyzing trace with hash 763672122, now seen corresponding path program 2 times [2020-08-21 18:15:23,874 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:15:23,874 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1528170048] [2020-08-21 18:15:23,874 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:15:23,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:23,928 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:15:23,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:23,938 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 18:15:23,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:24,357 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 18:15:24,357 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1528170048] [2020-08-21 18:15:24,358 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:15:24,358 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-21 18:15:24,358 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [104509427] [2020-08-21 18:15:24,358 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-21 18:15:24,358 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:15:24,359 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-21 18:15:24,359 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=156, Unknown=0, NotChecked=0, Total=240 [2020-08-21 18:15:24,359 INFO L87 Difference]: Start difference. First operand 51 states and 54 transitions. Second operand 16 states. [2020-08-21 18:15:24,578 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:15:24,579 INFO L93 Difference]: Finished difference Result 76 states and 82 transitions. [2020-08-21 18:15:24,579 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-21 18:15:24,579 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 46 [2020-08-21 18:15:24,579 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:15:24,580 INFO L225 Difference]: With dead ends: 76 [2020-08-21 18:15:24,580 INFO L226 Difference]: Without dead ends: 54 [2020-08-21 18:15:24,580 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=118, Invalid=224, Unknown=0, NotChecked=0, Total=342 [2020-08-21 18:15:24,581 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-21 18:15:24,584 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2020-08-21 18:15:24,584 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-21 18:15:24,585 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 56 transitions. [2020-08-21 18:15:24,585 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 56 transitions. Word has length 46 [2020-08-21 18:15:24,585 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:15:24,585 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 56 transitions. [2020-08-21 18:15:24,586 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-21 18:15:24,586 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 56 transitions. [2020-08-21 18:15:24,586 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-21 18:15:24,587 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:15:24,587 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:15:24,587 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-21 18:15:24,587 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:15:24,587 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:15:24,587 INFO L82 PathProgramCache]: Analyzing trace with hash -154353476, now seen corresponding path program 3 times [2020-08-21 18:15:24,588 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:15:24,588 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1150141715] [2020-08-21 18:15:24,588 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:15:24,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:24,619 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:15:24,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:24,631 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 18:15:24,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:25,071 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 18:15:25,072 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1150141715] [2020-08-21 18:15:25,072 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:15:25,072 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-21 18:15:25,073 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1000836294] [2020-08-21 18:15:25,073 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-21 18:15:25,073 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:15:25,073 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-21 18:15:25,074 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=175, Unknown=0, NotChecked=0, Total=272 [2020-08-21 18:15:25,074 INFO L87 Difference]: Start difference. First operand 53 states and 56 transitions. Second operand 17 states. [2020-08-21 18:15:25,320 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:15:25,321 INFO L93 Difference]: Finished difference Result 78 states and 84 transitions. [2020-08-21 18:15:25,321 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-21 18:15:25,321 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 48 [2020-08-21 18:15:25,321 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:15:25,322 INFO L225 Difference]: With dead ends: 78 [2020-08-21 18:15:25,322 INFO L226 Difference]: Without dead ends: 56 [2020-08-21 18:15:25,323 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=133, Invalid=247, Unknown=0, NotChecked=0, Total=380 [2020-08-21 18:15:25,323 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-08-21 18:15:25,327 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2020-08-21 18:15:25,327 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-21 18:15:25,327 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 58 transitions. [2020-08-21 18:15:25,327 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 58 transitions. Word has length 48 [2020-08-21 18:15:25,328 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:15:25,328 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 58 transitions. [2020-08-21 18:15:25,328 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-21 18:15:25,328 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 58 transitions. [2020-08-21 18:15:25,329 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-21 18:15:25,329 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:15:25,329 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:15:25,329 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-21 18:15:25,329 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:15:25,329 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:15:25,330 INFO L82 PathProgramCache]: Analyzing trace with hash -1908657474, now seen corresponding path program 4 times [2020-08-21 18:15:25,330 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:15:25,330 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1316609569] [2020-08-21 18:15:25,330 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:15:25,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:25,387 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:15:25,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:25,401 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 18:15:25,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:25,882 INFO L134 CoverageAnalysis]: Checked inductivity of 149 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 18:15:25,882 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1316609569] [2020-08-21 18:15:25,883 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:15:25,883 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-21 18:15:25,883 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [344124038] [2020-08-21 18:15:25,883 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-21 18:15:25,883 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:15:25,884 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-21 18:15:25,884 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=195, Unknown=0, NotChecked=0, Total=306 [2020-08-21 18:15:25,884 INFO L87 Difference]: Start difference. First operand 55 states and 58 transitions. Second operand 18 states. [2020-08-21 18:15:26,149 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:15:26,149 INFO L93 Difference]: Finished difference Result 80 states and 86 transitions. [2020-08-21 18:15:26,150 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-21 18:15:26,150 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 50 [2020-08-21 18:15:26,150 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:15:26,151 INFO L225 Difference]: With dead ends: 80 [2020-08-21 18:15:26,151 INFO L226 Difference]: Without dead ends: 58 [2020-08-21 18:15:26,151 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=149, Invalid=271, Unknown=0, NotChecked=0, Total=420 [2020-08-21 18:15:26,152 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-21 18:15:26,155 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2020-08-21 18:15:26,155 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-21 18:15:26,156 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 60 transitions. [2020-08-21 18:15:26,156 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 60 transitions. Word has length 50 [2020-08-21 18:15:26,156 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:15:26,156 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 60 transitions. [2020-08-21 18:15:26,157 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-21 18:15:26,157 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 60 transitions. [2020-08-21 18:15:26,157 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-21 18:15:26,157 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:15:26,157 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:15:26,158 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-21 18:15:26,158 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:15:26,158 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:15:26,158 INFO L82 PathProgramCache]: Analyzing trace with hash 127347776, now seen corresponding path program 5 times [2020-08-21 18:15:26,158 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:15:26,159 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1455603238] [2020-08-21 18:15:26,159 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:15:26,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:26,203 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:15:26,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:26,221 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 18:15:26,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:26,871 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 18:15:26,872 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1455603238] [2020-08-21 18:15:26,872 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:15:26,872 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-21 18:15:26,872 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [299212846] [2020-08-21 18:15:26,873 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-21 18:15:26,873 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:15:26,873 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-21 18:15:26,873 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=216, Unknown=0, NotChecked=0, Total=342 [2020-08-21 18:15:26,873 INFO L87 Difference]: Start difference. First operand 57 states and 60 transitions. Second operand 19 states. [2020-08-21 18:15:27,113 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:15:27,113 INFO L93 Difference]: Finished difference Result 82 states and 88 transitions. [2020-08-21 18:15:27,113 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-21 18:15:27,114 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 52 [2020-08-21 18:15:27,114 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:15:27,114 INFO L225 Difference]: With dead ends: 82 [2020-08-21 18:15:27,115 INFO L226 Difference]: Without dead ends: 60 [2020-08-21 18:15:27,115 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=166, Invalid=296, Unknown=0, NotChecked=0, Total=462 [2020-08-21 18:15:27,116 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-08-21 18:15:27,120 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 59. [2020-08-21 18:15:27,120 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-08-21 18:15:27,120 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 62 transitions. [2020-08-21 18:15:27,121 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 62 transitions. Word has length 52 [2020-08-21 18:15:27,121 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:15:27,121 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 62 transitions. [2020-08-21 18:15:27,121 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-21 18:15:27,121 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 62 transitions. [2020-08-21 18:15:27,122 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-21 18:15:27,122 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:15:27,122 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:15:27,123 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-21 18:15:27,123 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:15:27,123 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:15:27,123 INFO L82 PathProgramCache]: Analyzing trace with hash -1776693950, now seen corresponding path program 6 times [2020-08-21 18:15:27,125 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:15:27,125 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1165438526] [2020-08-21 18:15:27,125 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:15:27,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:27,161 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:15:27,162 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:27,172 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 18:15:27,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:27,767 INFO L134 CoverageAnalysis]: Checked inductivity of 201 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 18:15:27,767 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1165438526] [2020-08-21 18:15:27,768 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:15:27,768 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-21 18:15:27,768 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1494709071] [2020-08-21 18:15:27,768 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-21 18:15:27,769 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:15:27,769 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-21 18:15:27,769 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=142, Invalid=238, Unknown=0, NotChecked=0, Total=380 [2020-08-21 18:15:27,769 INFO L87 Difference]: Start difference. First operand 59 states and 62 transitions. Second operand 20 states. [2020-08-21 18:15:28,038 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:15:28,038 INFO L93 Difference]: Finished difference Result 84 states and 90 transitions. [2020-08-21 18:15:28,038 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-21 18:15:28,039 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 54 [2020-08-21 18:15:28,039 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:15:28,040 INFO L225 Difference]: With dead ends: 84 [2020-08-21 18:15:28,040 INFO L226 Difference]: Without dead ends: 62 [2020-08-21 18:15:28,040 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=184, Invalid=322, Unknown=0, NotChecked=0, Total=506 [2020-08-21 18:15:28,041 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-08-21 18:15:28,044 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2020-08-21 18:15:28,045 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-08-21 18:15:28,045 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 64 transitions. [2020-08-21 18:15:28,045 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 64 transitions. Word has length 54 [2020-08-21 18:15:28,045 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:15:28,045 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 64 transitions. [2020-08-21 18:15:28,046 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-21 18:15:28,046 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 64 transitions. [2020-08-21 18:15:28,046 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-21 18:15:28,046 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:15:28,046 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:15:28,047 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-21 18:15:28,047 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:15:28,047 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:15:28,047 INFO L82 PathProgramCache]: Analyzing trace with hash -1904724540, now seen corresponding path program 7 times [2020-08-21 18:15:28,047 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:15:28,048 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [82341748] [2020-08-21 18:15:28,048 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:15:28,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:28,096 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:15:28,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:28,105 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 18:15:28,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:28,789 INFO L134 CoverageAnalysis]: Checked inductivity of 230 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 18:15:28,790 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [82341748] [2020-08-21 18:15:28,790 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:15:28,790 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-21 18:15:28,790 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1524520333] [2020-08-21 18:15:28,791 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-21 18:15:28,791 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:15:28,791 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-21 18:15:28,791 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=159, Invalid=261, Unknown=0, NotChecked=0, Total=420 [2020-08-21 18:15:28,791 INFO L87 Difference]: Start difference. First operand 61 states and 64 transitions. Second operand 21 states. [2020-08-21 18:15:29,001 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:15:29,001 INFO L93 Difference]: Finished difference Result 86 states and 92 transitions. [2020-08-21 18:15:29,002 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-21 18:15:29,002 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 56 [2020-08-21 18:15:29,002 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:15:29,003 INFO L225 Difference]: With dead ends: 86 [2020-08-21 18:15:29,003 INFO L226 Difference]: Without dead ends: 64 [2020-08-21 18:15:29,004 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=203, Invalid=349, Unknown=0, NotChecked=0, Total=552 [2020-08-21 18:15:29,005 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-08-21 18:15:29,008 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2020-08-21 18:15:29,009 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2020-08-21 18:15:29,009 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 66 transitions. [2020-08-21 18:15:29,009 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 66 transitions. Word has length 56 [2020-08-21 18:15:29,010 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:15:29,010 INFO L479 AbstractCegarLoop]: Abstraction has 63 states and 66 transitions. [2020-08-21 18:15:29,010 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-21 18:15:29,010 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 66 transitions. [2020-08-21 18:15:29,010 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-08-21 18:15:29,011 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:15:29,011 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:15:29,011 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-21 18:15:29,011 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:15:29,011 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:15:29,011 INFO L82 PathProgramCache]: Analyzing trace with hash -388069946, now seen corresponding path program 8 times [2020-08-21 18:15:29,012 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:15:29,012 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [109812503] [2020-08-21 18:15:29,012 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:15:29,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:29,059 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:15:29,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:29,070 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 18:15:29,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:29,736 INFO L134 CoverageAnalysis]: Checked inductivity of 261 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 18:15:29,737 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [109812503] [2020-08-21 18:15:29,737 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:15:29,737 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-21 18:15:29,737 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [279253372] [2020-08-21 18:15:29,738 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-21 18:15:29,738 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:15:29,738 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-21 18:15:29,738 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=177, Invalid=285, Unknown=0, NotChecked=0, Total=462 [2020-08-21 18:15:29,739 INFO L87 Difference]: Start difference. First operand 63 states and 66 transitions. Second operand 22 states. [2020-08-21 18:15:30,030 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:15:30,030 INFO L93 Difference]: Finished difference Result 88 states and 94 transitions. [2020-08-21 18:15:30,031 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-21 18:15:30,031 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 58 [2020-08-21 18:15:30,031 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:15:30,032 INFO L225 Difference]: With dead ends: 88 [2020-08-21 18:15:30,032 INFO L226 Difference]: Without dead ends: 66 [2020-08-21 18:15:30,033 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=223, Invalid=377, Unknown=0, NotChecked=0, Total=600 [2020-08-21 18:15:30,034 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-08-21 18:15:30,037 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2020-08-21 18:15:30,037 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-08-21 18:15:30,038 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 68 transitions. [2020-08-21 18:15:30,038 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 68 transitions. Word has length 58 [2020-08-21 18:15:30,038 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:15:30,038 INFO L479 AbstractCegarLoop]: Abstraction has 65 states and 68 transitions. [2020-08-21 18:15:30,038 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-21 18:15:30,038 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 68 transitions. [2020-08-21 18:15:30,039 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2020-08-21 18:15:30,039 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:15:30,039 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:15:30,039 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-21 18:15:30,040 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:15:30,040 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:15:30,040 INFO L82 PathProgramCache]: Analyzing trace with hash 1123081544, now seen corresponding path program 9 times [2020-08-21 18:15:30,040 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:15:30,040 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [312119614] [2020-08-21 18:15:30,040 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:15:30,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:30,097 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:15:30,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:30,107 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 18:15:30,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:30,838 INFO L134 CoverageAnalysis]: Checked inductivity of 294 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 18:15:30,839 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [312119614] [2020-08-21 18:15:30,839 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:15:30,839 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-21 18:15:30,839 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [377486276] [2020-08-21 18:15:30,840 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-21 18:15:30,840 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:15:30,840 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-21 18:15:30,840 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=196, Invalid=310, Unknown=0, NotChecked=0, Total=506 [2020-08-21 18:15:30,840 INFO L87 Difference]: Start difference. First operand 65 states and 68 transitions. Second operand 23 states. [2020-08-21 18:15:31,147 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:15:31,148 INFO L93 Difference]: Finished difference Result 90 states and 96 transitions. [2020-08-21 18:15:31,150 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-21 18:15:31,150 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 60 [2020-08-21 18:15:31,150 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:15:31,151 INFO L225 Difference]: With dead ends: 90 [2020-08-21 18:15:31,151 INFO L226 Difference]: Without dead ends: 68 [2020-08-21 18:15:31,152 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=244, Invalid=406, Unknown=0, NotChecked=0, Total=650 [2020-08-21 18:15:31,153 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-08-21 18:15:31,156 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 67. [2020-08-21 18:15:31,156 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-08-21 18:15:31,157 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 70 transitions. [2020-08-21 18:15:31,157 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 70 transitions. Word has length 60 [2020-08-21 18:15:31,157 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:15:31,157 INFO L479 AbstractCegarLoop]: Abstraction has 67 states and 70 transitions. [2020-08-21 18:15:31,157 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-21 18:15:31,158 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 70 transitions. [2020-08-21 18:15:31,158 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2020-08-21 18:15:31,158 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:15:31,158 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:15:31,159 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-21 18:15:31,159 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:15:31,159 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:15:31,159 INFO L82 PathProgramCache]: Analyzing trace with hash 1640717386, now seen corresponding path program 10 times [2020-08-21 18:15:31,159 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:15:31,160 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [60218640] [2020-08-21 18:15:31,160 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:15:31,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:31,216 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:15:31,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:31,225 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 18:15:31,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:32,028 INFO L134 CoverageAnalysis]: Checked inductivity of 329 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 18:15:32,028 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [60218640] [2020-08-21 18:15:32,028 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:15:32,028 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-21 18:15:32,029 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1749902918] [2020-08-21 18:15:32,029 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-21 18:15:32,030 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:15:32,030 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-21 18:15:32,031 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=216, Invalid=336, Unknown=0, NotChecked=0, Total=552 [2020-08-21 18:15:32,031 INFO L87 Difference]: Start difference. First operand 67 states and 70 transitions. Second operand 24 states. [2020-08-21 18:15:32,284 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:15:32,284 INFO L93 Difference]: Finished difference Result 92 states and 98 transitions. [2020-08-21 18:15:32,284 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-21 18:15:32,284 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 62 [2020-08-21 18:15:32,285 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:15:32,285 INFO L225 Difference]: With dead ends: 92 [2020-08-21 18:15:32,285 INFO L226 Difference]: Without dead ends: 70 [2020-08-21 18:15:32,288 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=266, Invalid=436, Unknown=0, NotChecked=0, Total=702 [2020-08-21 18:15:32,288 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-08-21 18:15:32,291 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 69. [2020-08-21 18:15:32,291 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2020-08-21 18:15:32,291 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 72 transitions. [2020-08-21 18:15:32,292 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 72 transitions. Word has length 62 [2020-08-21 18:15:32,293 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:15:32,293 INFO L479 AbstractCegarLoop]: Abstraction has 69 states and 72 transitions. [2020-08-21 18:15:32,293 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-21 18:15:32,293 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 72 transitions. [2020-08-21 18:15:32,294 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2020-08-21 18:15:32,294 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:15:32,294 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:15:32,294 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-21 18:15:32,294 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:15:32,294 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:15:32,295 INFO L82 PathProgramCache]: Analyzing trace with hash 872555212, now seen corresponding path program 11 times [2020-08-21 18:15:32,295 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:15:32,295 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1980900235] [2020-08-21 18:15:32,295 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:15:32,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:32,352 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:15:32,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:32,361 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 18:15:32,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:33,255 INFO L134 CoverageAnalysis]: Checked inductivity of 366 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 18:15:33,255 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1980900235] [2020-08-21 18:15:33,256 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:15:33,256 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-21 18:15:33,256 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [917251519] [2020-08-21 18:15:33,256 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-21 18:15:33,256 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:15:33,256 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-21 18:15:33,257 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=237, Invalid=363, Unknown=0, NotChecked=0, Total=600 [2020-08-21 18:15:33,257 INFO L87 Difference]: Start difference. First operand 69 states and 72 transitions. Second operand 25 states. [2020-08-21 18:15:33,600 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:15:33,600 INFO L93 Difference]: Finished difference Result 94 states and 100 transitions. [2020-08-21 18:15:33,601 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-21 18:15:33,601 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 64 [2020-08-21 18:15:33,601 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:15:33,602 INFO L225 Difference]: With dead ends: 94 [2020-08-21 18:15:33,602 INFO L226 Difference]: Without dead ends: 72 [2020-08-21 18:15:33,603 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=289, Invalid=467, Unknown=0, NotChecked=0, Total=756 [2020-08-21 18:15:33,603 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-08-21 18:15:33,606 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 71. [2020-08-21 18:15:33,606 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-08-21 18:15:33,607 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 74 transitions. [2020-08-21 18:15:33,607 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 74 transitions. Word has length 64 [2020-08-21 18:15:33,607 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:15:33,607 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 74 transitions. [2020-08-21 18:15:33,607 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-21 18:15:33,607 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 74 transitions. [2020-08-21 18:15:33,608 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2020-08-21 18:15:33,608 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:15:33,608 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:15:33,608 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-21 18:15:33,609 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:15:33,609 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:15:33,609 INFO L82 PathProgramCache]: Analyzing trace with hash 1403080910, now seen corresponding path program 12 times [2020-08-21 18:15:33,609 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:15:33,609 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1250520717] [2020-08-21 18:15:33,609 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:15:33,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:33,658 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:15:33,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:33,668 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 18:15:33,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:34,778 INFO L134 CoverageAnalysis]: Checked inductivity of 405 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 18:15:34,778 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1250520717] [2020-08-21 18:15:34,778 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:15:34,778 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-21 18:15:34,778 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2087324830] [2020-08-21 18:15:34,779 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-21 18:15:34,779 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:15:34,779 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-21 18:15:34,779 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=259, Invalid=391, Unknown=0, NotChecked=0, Total=650 [2020-08-21 18:15:34,779 INFO L87 Difference]: Start difference. First operand 71 states and 74 transitions. Second operand 26 states. [2020-08-21 18:15:35,106 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:15:35,106 INFO L93 Difference]: Finished difference Result 96 states and 102 transitions. [2020-08-21 18:15:35,107 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-21 18:15:35,107 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 66 [2020-08-21 18:15:35,107 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:15:35,108 INFO L225 Difference]: With dead ends: 96 [2020-08-21 18:15:35,108 INFO L226 Difference]: Without dead ends: 74 [2020-08-21 18:15:35,108 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=313, Invalid=499, Unknown=0, NotChecked=0, Total=812 [2020-08-21 18:15:35,109 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2020-08-21 18:15:35,112 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 73. [2020-08-21 18:15:35,112 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-08-21 18:15:35,113 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 76 transitions. [2020-08-21 18:15:35,113 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 76 transitions. Word has length 66 [2020-08-21 18:15:35,113 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:15:35,113 INFO L479 AbstractCegarLoop]: Abstraction has 73 states and 76 transitions. [2020-08-21 18:15:35,113 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-21 18:15:35,114 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 76 transitions. [2020-08-21 18:15:35,114 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-08-21 18:15:35,114 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:15:35,114 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:15:35,115 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-21 18:15:35,115 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:15:35,115 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:15:35,115 INFO L82 PathProgramCache]: Analyzing trace with hash 137168464, now seen corresponding path program 13 times [2020-08-21 18:15:35,115 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:15:35,116 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1270531316] [2020-08-21 18:15:35,116 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:15:35,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:35,161 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:15:35,162 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:35,172 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 18:15:35,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:36,182 INFO L134 CoverageAnalysis]: Checked inductivity of 446 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 18:15:36,182 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1270531316] [2020-08-21 18:15:36,182 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:15:36,182 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-21 18:15:36,183 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1647790421] [2020-08-21 18:15:36,183 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-21 18:15:36,183 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:15:36,183 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-21 18:15:36,184 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=282, Invalid=420, Unknown=0, NotChecked=0, Total=702 [2020-08-21 18:15:36,184 INFO L87 Difference]: Start difference. First operand 73 states and 76 transitions. Second operand 27 states. [2020-08-21 18:15:36,423 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:15:36,424 INFO L93 Difference]: Finished difference Result 98 states and 104 transitions. [2020-08-21 18:15:36,424 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-21 18:15:36,424 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 68 [2020-08-21 18:15:36,424 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:15:36,425 INFO L225 Difference]: With dead ends: 98 [2020-08-21 18:15:36,425 INFO L226 Difference]: Without dead ends: 76 [2020-08-21 18:15:36,426 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=338, Invalid=532, Unknown=0, NotChecked=0, Total=870 [2020-08-21 18:15:36,426 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-08-21 18:15:36,429 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 75. [2020-08-21 18:15:36,429 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2020-08-21 18:15:36,430 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 78 transitions. [2020-08-21 18:15:36,430 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 78 transitions. Word has length 68 [2020-08-21 18:15:36,430 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:15:36,430 INFO L479 AbstractCegarLoop]: Abstraction has 75 states and 78 transitions. [2020-08-21 18:15:36,430 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-21 18:15:36,430 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 78 transitions. [2020-08-21 18:15:36,431 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2020-08-21 18:15:36,431 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:15:36,431 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:15:36,431 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-21 18:15:36,431 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:15:36,432 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:15:36,432 INFO L82 PathProgramCache]: Analyzing trace with hash -928947374, now seen corresponding path program 14 times [2020-08-21 18:15:36,432 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:15:36,432 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1008942970] [2020-08-21 18:15:36,432 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:15:36,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:36,479 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:15:36,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:36,490 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 18:15:36,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:37,553 INFO L134 CoverageAnalysis]: Checked inductivity of 489 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 18:15:37,554 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1008942970] [2020-08-21 18:15:37,554 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:15:37,554 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-21 18:15:37,554 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1215204345] [2020-08-21 18:15:37,556 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-21 18:15:37,556 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:15:37,557 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-21 18:15:37,557 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=306, Invalid=450, Unknown=0, NotChecked=0, Total=756 [2020-08-21 18:15:37,557 INFO L87 Difference]: Start difference. First operand 75 states and 78 transitions. Second operand 28 states. [2020-08-21 18:15:37,870 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:15:37,871 INFO L93 Difference]: Finished difference Result 100 states and 106 transitions. [2020-08-21 18:15:37,871 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-21 18:15:37,871 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 70 [2020-08-21 18:15:37,872 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:15:37,872 INFO L225 Difference]: With dead ends: 100 [2020-08-21 18:15:37,873 INFO L226 Difference]: Without dead ends: 78 [2020-08-21 18:15:37,874 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=364, Invalid=566, Unknown=0, NotChecked=0, Total=930 [2020-08-21 18:15:37,874 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-08-21 18:15:37,877 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 77. [2020-08-21 18:15:37,878 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2020-08-21 18:15:37,878 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 80 transitions. [2020-08-21 18:15:37,878 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 80 transitions. Word has length 70 [2020-08-21 18:15:37,879 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:15:37,879 INFO L479 AbstractCegarLoop]: Abstraction has 77 states and 80 transitions. [2020-08-21 18:15:37,879 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-21 18:15:37,879 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 80 transitions. [2020-08-21 18:15:37,879 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2020-08-21 18:15:37,879 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:15:37,880 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:15:37,880 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-21 18:15:37,880 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:15:37,880 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:15:37,880 INFO L82 PathProgramCache]: Analyzing trace with hash 1030916052, now seen corresponding path program 15 times [2020-08-21 18:15:37,881 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:15:37,881 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1735133576] [2020-08-21 18:15:37,881 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:15:37,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:37,926 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:15:37,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:37,949 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 18:15:37,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:39,078 INFO L134 CoverageAnalysis]: Checked inductivity of 534 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 18:15:39,078 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1735133576] [2020-08-21 18:15:39,078 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:15:39,079 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-21 18:15:39,079 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1425117145] [2020-08-21 18:15:39,079 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-21 18:15:39,079 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:15:39,080 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-21 18:15:39,080 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=331, Invalid=481, Unknown=0, NotChecked=0, Total=812 [2020-08-21 18:15:39,080 INFO L87 Difference]: Start difference. First operand 77 states and 80 transitions. Second operand 29 states. [2020-08-21 18:15:39,452 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:15:39,452 INFO L93 Difference]: Finished difference Result 102 states and 108 transitions. [2020-08-21 18:15:39,452 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-21 18:15:39,452 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 72 [2020-08-21 18:15:39,453 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:15:39,453 INFO L225 Difference]: With dead ends: 102 [2020-08-21 18:15:39,454 INFO L226 Difference]: Without dead ends: 80 [2020-08-21 18:15:39,454 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=391, Invalid=601, Unknown=0, NotChecked=0, Total=992 [2020-08-21 18:15:39,455 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-08-21 18:15:39,458 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 79. [2020-08-21 18:15:39,458 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-08-21 18:15:39,458 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 82 transitions. [2020-08-21 18:15:39,459 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 82 transitions. Word has length 72 [2020-08-21 18:15:39,459 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:15:39,459 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 82 transitions. [2020-08-21 18:15:39,459 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-21 18:15:39,459 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 82 transitions. [2020-08-21 18:15:39,459 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2020-08-21 18:15:39,460 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:15:39,460 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:15:39,460 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-21 18:15:39,460 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:15:39,460 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:15:39,460 INFO L82 PathProgramCache]: Analyzing trace with hash -1030974506, now seen corresponding path program 16 times [2020-08-21 18:15:39,461 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:15:39,461 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [924592851] [2020-08-21 18:15:39,461 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:15:39,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:39,513 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:15:39,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:39,522 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 18:15:39,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:40,694 INFO L134 CoverageAnalysis]: Checked inductivity of 581 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 18:15:40,695 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [924592851] [2020-08-21 18:15:40,695 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:15:40,695 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-21 18:15:40,695 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [435064796] [2020-08-21 18:15:40,696 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-21 18:15:40,696 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:15:40,696 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-21 18:15:40,697 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=357, Invalid=513, Unknown=0, NotChecked=0, Total=870 [2020-08-21 18:15:40,697 INFO L87 Difference]: Start difference. First operand 79 states and 82 transitions. Second operand 30 states. [2020-08-21 18:15:40,972 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:15:40,972 INFO L93 Difference]: Finished difference Result 104 states and 110 transitions. [2020-08-21 18:15:40,972 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-21 18:15:40,972 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 74 [2020-08-21 18:15:40,973 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:15:40,973 INFO L225 Difference]: With dead ends: 104 [2020-08-21 18:15:40,973 INFO L226 Difference]: Without dead ends: 82 [2020-08-21 18:15:40,974 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=419, Invalid=637, Unknown=0, NotChecked=0, Total=1056 [2020-08-21 18:15:40,974 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-08-21 18:15:40,977 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 81. [2020-08-21 18:15:40,977 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2020-08-21 18:15:40,978 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 84 transitions. [2020-08-21 18:15:40,978 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 84 transitions. Word has length 74 [2020-08-21 18:15:40,978 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:15:40,978 INFO L479 AbstractCegarLoop]: Abstraction has 81 states and 84 transitions. [2020-08-21 18:15:40,978 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-21 18:15:40,979 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 84 transitions. [2020-08-21 18:15:40,979 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2020-08-21 18:15:40,979 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:15:40,980 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:15:40,980 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-21 18:15:40,980 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:15:40,980 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:15:40,980 INFO L82 PathProgramCache]: Analyzing trace with hash 1767090008, now seen corresponding path program 17 times [2020-08-21 18:15:40,980 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:15:40,981 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [928533511] [2020-08-21 18:15:40,981 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:15:40,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:41,028 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:15:41,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:41,039 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 18:15:41,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:42,448 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 625 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 18:15:42,449 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [928533511] [2020-08-21 18:15:42,449 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:15:42,449 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-21 18:15:42,453 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1082046399] [2020-08-21 18:15:42,453 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-21 18:15:42,453 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:15:42,453 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-21 18:15:42,454 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=384, Invalid=546, Unknown=0, NotChecked=0, Total=930 [2020-08-21 18:15:42,454 INFO L87 Difference]: Start difference. First operand 81 states and 84 transitions. Second operand 31 states. [2020-08-21 18:15:42,862 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:15:42,863 INFO L93 Difference]: Finished difference Result 106 states and 112 transitions. [2020-08-21 18:15:42,863 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-21 18:15:42,863 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 76 [2020-08-21 18:15:42,863 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:15:42,864 INFO L225 Difference]: With dead ends: 106 [2020-08-21 18:15:42,864 INFO L226 Difference]: Without dead ends: 84 [2020-08-21 18:15:42,865 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=448, Invalid=674, Unknown=0, NotChecked=0, Total=1122 [2020-08-21 18:15:42,865 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2020-08-21 18:15:42,868 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 83. [2020-08-21 18:15:42,868 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2020-08-21 18:15:42,869 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 86 transitions. [2020-08-21 18:15:42,869 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 86 transitions. Word has length 76 [2020-08-21 18:15:42,869 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:15:42,869 INFO L479 AbstractCegarLoop]: Abstraction has 83 states and 86 transitions. [2020-08-21 18:15:42,870 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-21 18:15:42,870 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 86 transitions. [2020-08-21 18:15:42,870 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-08-21 18:15:42,870 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:15:42,871 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:15:42,871 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-21 18:15:42,871 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:15:42,871 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:15:42,871 INFO L82 PathProgramCache]: Analyzing trace with hash 2057560666, now seen corresponding path program 18 times [2020-08-21 18:15:42,871 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:15:42,872 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1136155530] [2020-08-21 18:15:42,872 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:15:42,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:42,922 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:15:42,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:42,932 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 18:15:42,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:44,297 INFO L134 CoverageAnalysis]: Checked inductivity of 681 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 18:15:44,297 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1136155530] [2020-08-21 18:15:44,297 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:15:44,297 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-21 18:15:44,298 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [702427950] [2020-08-21 18:15:44,298 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-21 18:15:44,298 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:15:44,298 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-21 18:15:44,299 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=412, Invalid=580, Unknown=0, NotChecked=0, Total=992 [2020-08-21 18:15:44,299 INFO L87 Difference]: Start difference. First operand 83 states and 86 transitions. Second operand 32 states. [2020-08-21 18:15:44,701 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:15:44,701 INFO L93 Difference]: Finished difference Result 108 states and 114 transitions. [2020-08-21 18:15:44,701 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-21 18:15:44,702 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 78 [2020-08-21 18:15:44,702 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:15:44,703 INFO L225 Difference]: With dead ends: 108 [2020-08-21 18:15:44,703 INFO L226 Difference]: Without dead ends: 86 [2020-08-21 18:15:44,704 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=478, Invalid=712, Unknown=0, NotChecked=0, Total=1190 [2020-08-21 18:15:44,704 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2020-08-21 18:15:44,707 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 85. [2020-08-21 18:15:44,707 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2020-08-21 18:15:44,707 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 88 transitions. [2020-08-21 18:15:44,708 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 88 transitions. Word has length 78 [2020-08-21 18:15:44,708 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:15:44,708 INFO L479 AbstractCegarLoop]: Abstraction has 85 states and 88 transitions. [2020-08-21 18:15:44,708 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-21 18:15:44,708 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 88 transitions. [2020-08-21 18:15:44,708 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2020-08-21 18:15:44,708 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:15:44,709 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:15:44,709 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-21 18:15:44,709 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:15:44,709 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:15:44,709 INFO L82 PathProgramCache]: Analyzing trace with hash 2026988764, now seen corresponding path program 19 times [2020-08-21 18:15:44,709 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:15:44,709 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [553894373] [2020-08-21 18:15:44,710 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:15:44,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:44,757 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:15:44,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:44,769 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 18:15:44,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:46,284 INFO L134 CoverageAnalysis]: Checked inductivity of 734 backedges. 0 proven. 729 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 18:15:46,285 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [553894373] [2020-08-21 18:15:46,285 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:15:46,285 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-21 18:15:46,285 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1591661469] [2020-08-21 18:15:46,286 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-21 18:15:46,286 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:15:46,286 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-21 18:15:46,286 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=441, Invalid=615, Unknown=0, NotChecked=0, Total=1056 [2020-08-21 18:15:46,286 INFO L87 Difference]: Start difference. First operand 85 states and 88 transitions. Second operand 33 states. [2020-08-21 18:15:46,686 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:15:46,687 INFO L93 Difference]: Finished difference Result 110 states and 116 transitions. [2020-08-21 18:15:46,687 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-21 18:15:46,687 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 80 [2020-08-21 18:15:46,688 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:15:46,688 INFO L225 Difference]: With dead ends: 110 [2020-08-21 18:15:46,689 INFO L226 Difference]: Without dead ends: 88 [2020-08-21 18:15:46,690 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=509, Invalid=751, Unknown=0, NotChecked=0, Total=1260 [2020-08-21 18:15:46,690 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-08-21 18:15:46,692 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 87. [2020-08-21 18:15:46,693 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2020-08-21 18:15:46,693 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 90 transitions. [2020-08-21 18:15:46,693 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 90 transitions. Word has length 80 [2020-08-21 18:15:46,694 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:15:46,694 INFO L479 AbstractCegarLoop]: Abstraction has 87 states and 90 transitions. [2020-08-21 18:15:46,694 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-21 18:15:46,694 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 90 transitions. [2020-08-21 18:15:46,695 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2020-08-21 18:15:46,695 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:15:46,695 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:15:46,695 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-21 18:15:46,695 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:15:46,695 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:15:46,696 INFO L82 PathProgramCache]: Analyzing trace with hash -1582805282, now seen corresponding path program 20 times [2020-08-21 18:15:46,696 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:15:46,696 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2012381951] [2020-08-21 18:15:46,696 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:15:46,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:46,747 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:15:46,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:46,757 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 18:15:46,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:48,350 INFO L134 CoverageAnalysis]: Checked inductivity of 789 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 18:15:48,350 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2012381951] [2020-08-21 18:15:48,350 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:15:48,350 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-21 18:15:48,350 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [772470234] [2020-08-21 18:15:48,351 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-21 18:15:48,351 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:15:48,351 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-21 18:15:48,351 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=471, Invalid=651, Unknown=0, NotChecked=0, Total=1122 [2020-08-21 18:15:48,351 INFO L87 Difference]: Start difference. First operand 87 states and 90 transitions. Second operand 34 states. [2020-08-21 18:15:48,768 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:15:48,768 INFO L93 Difference]: Finished difference Result 112 states and 118 transitions. [2020-08-21 18:15:48,768 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-21 18:15:48,769 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 82 [2020-08-21 18:15:48,769 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:15:48,770 INFO L225 Difference]: With dead ends: 112 [2020-08-21 18:15:48,770 INFO L226 Difference]: Without dead ends: 90 [2020-08-21 18:15:48,771 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=541, Invalid=791, Unknown=0, NotChecked=0, Total=1332 [2020-08-21 18:15:48,772 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2020-08-21 18:15:48,774 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 89. [2020-08-21 18:15:48,774 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2020-08-21 18:15:48,775 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 92 transitions. [2020-08-21 18:15:48,775 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 92 transitions. Word has length 82 [2020-08-21 18:15:48,775 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:15:48,775 INFO L479 AbstractCegarLoop]: Abstraction has 89 states and 92 transitions. [2020-08-21 18:15:48,776 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-21 18:15:48,776 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 92 transitions. [2020-08-21 18:15:48,776 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2020-08-21 18:15:48,777 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:15:48,777 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:15:48,777 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-21 18:15:48,777 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:15:48,777 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:15:48,777 INFO L82 PathProgramCache]: Analyzing trace with hash -261308320, now seen corresponding path program 21 times [2020-08-21 18:15:48,777 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:15:48,778 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1202727925] [2020-08-21 18:15:48,778 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:15:48,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:48,833 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:15:48,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:48,844 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 18:15:48,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:50,474 INFO L134 CoverageAnalysis]: Checked inductivity of 846 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 18:15:50,474 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1202727925] [2020-08-21 18:15:50,474 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:15:50,474 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-21 18:15:50,474 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [259416364] [2020-08-21 18:15:50,475 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-21 18:15:50,475 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:15:50,475 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-21 18:15:50,475 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=502, Invalid=688, Unknown=0, NotChecked=0, Total=1190 [2020-08-21 18:15:50,475 INFO L87 Difference]: Start difference. First operand 89 states and 92 transitions. Second operand 35 states. [2020-08-21 18:15:50,945 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:15:50,945 INFO L93 Difference]: Finished difference Result 114 states and 120 transitions. [2020-08-21 18:15:50,945 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-21 18:15:50,946 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 84 [2020-08-21 18:15:50,946 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:15:50,947 INFO L225 Difference]: With dead ends: 114 [2020-08-21 18:15:50,947 INFO L226 Difference]: Without dead ends: 92 [2020-08-21 18:15:50,948 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=574, Invalid=832, Unknown=0, NotChecked=0, Total=1406 [2020-08-21 18:15:50,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2020-08-21 18:15:50,952 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 91. [2020-08-21 18:15:50,952 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2020-08-21 18:15:50,953 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 94 transitions. [2020-08-21 18:15:50,953 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 94 transitions. Word has length 84 [2020-08-21 18:15:50,953 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:15:50,953 INFO L479 AbstractCegarLoop]: Abstraction has 91 states and 94 transitions. [2020-08-21 18:15:50,953 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-21 18:15:50,954 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 94 transitions. [2020-08-21 18:15:50,954 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2020-08-21 18:15:50,954 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:15:50,955 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:15:50,955 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-21 18:15:50,955 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:15:50,955 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:15:50,955 INFO L82 PathProgramCache]: Analyzing trace with hash -1613047454, now seen corresponding path program 22 times [2020-08-21 18:15:50,956 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:15:50,956 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1842626960] [2020-08-21 18:15:50,956 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:15:50,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:51,008 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:15:51,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:51,018 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 18:15:51,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:52,645 INFO L134 CoverageAnalysis]: Checked inductivity of 905 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 18:15:52,646 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1842626960] [2020-08-21 18:15:52,646 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:15:52,646 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-21 18:15:52,646 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [347241836] [2020-08-21 18:15:52,647 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-21 18:15:52,647 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:15:52,647 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-21 18:15:52,648 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=534, Invalid=726, Unknown=0, NotChecked=0, Total=1260 [2020-08-21 18:15:52,648 INFO L87 Difference]: Start difference. First operand 91 states and 94 transitions. Second operand 36 states. [2020-08-21 18:15:52,978 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:15:52,978 INFO L93 Difference]: Finished difference Result 116 states and 122 transitions. [2020-08-21 18:15:52,979 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-21 18:15:52,979 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 86 [2020-08-21 18:15:52,979 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:15:52,980 INFO L225 Difference]: With dead ends: 116 [2020-08-21 18:15:52,980 INFO L226 Difference]: Without dead ends: 94 [2020-08-21 18:15:52,981 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=608, Invalid=874, Unknown=0, NotChecked=0, Total=1482 [2020-08-21 18:15:52,981 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2020-08-21 18:15:52,986 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 93. [2020-08-21 18:15:52,986 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2020-08-21 18:15:52,987 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 96 transitions. [2020-08-21 18:15:52,987 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 96 transitions. Word has length 86 [2020-08-21 18:15:52,987 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:15:52,987 INFO L479 AbstractCegarLoop]: Abstraction has 93 states and 96 transitions. [2020-08-21 18:15:52,988 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-21 18:15:52,988 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 96 transitions. [2020-08-21 18:15:52,988 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2020-08-21 18:15:52,988 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:15:52,989 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:15:52,989 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-21 18:15:52,989 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:15:52,989 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:15:52,989 INFO L82 PathProgramCache]: Analyzing trace with hash 740735460, now seen corresponding path program 23 times [2020-08-21 18:15:52,990 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:15:52,990 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [537026439] [2020-08-21 18:15:52,990 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:15:53,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:53,042 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:15:53,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:53,054 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 18:15:53,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:54,834 INFO L134 CoverageAnalysis]: Checked inductivity of 966 backedges. 0 proven. 961 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 18:15:54,834 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [537026439] [2020-08-21 18:15:54,834 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:15:54,834 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-21 18:15:54,834 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1244657466] [2020-08-21 18:15:54,835 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-21 18:15:54,835 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:15:54,835 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-21 18:15:54,835 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=567, Invalid=765, Unknown=0, NotChecked=0, Total=1332 [2020-08-21 18:15:54,835 INFO L87 Difference]: Start difference. First operand 93 states and 96 transitions. Second operand 37 states. [2020-08-21 18:15:55,283 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:15:55,284 INFO L93 Difference]: Finished difference Result 118 states and 124 transitions. [2020-08-21 18:15:55,284 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-21 18:15:55,284 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 88 [2020-08-21 18:15:55,285 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:15:55,286 INFO L225 Difference]: With dead ends: 118 [2020-08-21 18:15:55,286 INFO L226 Difference]: Without dead ends: 96 [2020-08-21 18:15:55,287 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=643, Invalid=917, Unknown=0, NotChecked=0, Total=1560 [2020-08-21 18:15:55,288 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2020-08-21 18:15:55,291 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 95. [2020-08-21 18:15:55,291 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2020-08-21 18:15:55,292 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 98 transitions. [2020-08-21 18:15:55,292 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 98 transitions. Word has length 88 [2020-08-21 18:15:55,292 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:15:55,292 INFO L479 AbstractCegarLoop]: Abstraction has 95 states and 98 transitions. [2020-08-21 18:15:55,292 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-21 18:15:55,292 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 98 transitions. [2020-08-21 18:15:55,293 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2020-08-21 18:15:55,293 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:15:55,293 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:15:55,294 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-21 18:15:55,294 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:15:55,294 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:15:55,294 INFO L82 PathProgramCache]: Analyzing trace with hash -721649178, now seen corresponding path program 24 times [2020-08-21 18:15:55,294 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:15:55,294 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1327879869] [2020-08-21 18:15:55,295 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:15:55,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:55,349 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:15:55,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:55,362 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 18:15:55,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:57,137 INFO L134 CoverageAnalysis]: Checked inductivity of 1029 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 18:15:57,137 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1327879869] [2020-08-21 18:15:57,137 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:15:57,138 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-21 18:15:57,138 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1195228949] [2020-08-21 18:15:57,139 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-21 18:15:57,139 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:15:57,139 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-21 18:15:57,140 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=601, Invalid=805, Unknown=0, NotChecked=0, Total=1406 [2020-08-21 18:15:57,140 INFO L87 Difference]: Start difference. First operand 95 states and 98 transitions. Second operand 38 states. [2020-08-21 18:15:57,534 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:15:57,535 INFO L93 Difference]: Finished difference Result 120 states and 126 transitions. [2020-08-21 18:15:57,535 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-21 18:15:57,535 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 90 [2020-08-21 18:15:57,535 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:15:57,536 INFO L225 Difference]: With dead ends: 120 [2020-08-21 18:15:57,536 INFO L226 Difference]: Without dead ends: 98 [2020-08-21 18:15:57,537 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=679, Invalid=961, Unknown=0, NotChecked=0, Total=1640 [2020-08-21 18:15:57,538 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-08-21 18:15:57,542 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 97. [2020-08-21 18:15:57,542 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2020-08-21 18:15:57,542 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 100 transitions. [2020-08-21 18:15:57,543 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 100 transitions. Word has length 90 [2020-08-21 18:15:57,543 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:15:57,543 INFO L479 AbstractCegarLoop]: Abstraction has 97 states and 100 transitions. [2020-08-21 18:15:57,543 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-21 18:15:57,543 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 100 transitions. [2020-08-21 18:15:57,544 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2020-08-21 18:15:57,544 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:15:57,544 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:15:57,544 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-21 18:15:57,544 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:15:57,545 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:15:57,545 INFO L82 PathProgramCache]: Analyzing trace with hash -1618980504, now seen corresponding path program 25 times [2020-08-21 18:15:57,545 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:15:57,545 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [981902195] [2020-08-21 18:15:57,545 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:15:57,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:57,607 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:15:57,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:57,620 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 18:15:57,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:59,539 INFO L134 CoverageAnalysis]: Checked inductivity of 1094 backedges. 0 proven. 1089 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 18:15:59,540 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [981902195] [2020-08-21 18:15:59,540 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:15:59,540 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-21 18:15:59,540 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [91287672] [2020-08-21 18:15:59,540 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-21 18:15:59,540 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:15:59,541 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-21 18:15:59,541 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=636, Invalid=846, Unknown=0, NotChecked=0, Total=1482 [2020-08-21 18:15:59,541 INFO L87 Difference]: Start difference. First operand 97 states and 100 transitions. Second operand 39 states. [2020-08-21 18:15:59,862 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:15:59,863 INFO L93 Difference]: Finished difference Result 122 states and 128 transitions. [2020-08-21 18:15:59,863 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-21 18:15:59,863 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 92 [2020-08-21 18:15:59,864 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:15:59,865 INFO L225 Difference]: With dead ends: 122 [2020-08-21 18:15:59,865 INFO L226 Difference]: Without dead ends: 100 [2020-08-21 18:15:59,866 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=716, Invalid=1006, Unknown=0, NotChecked=0, Total=1722 [2020-08-21 18:15:59,867 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2020-08-21 18:15:59,870 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 99. [2020-08-21 18:15:59,871 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2020-08-21 18:15:59,871 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 102 transitions. [2020-08-21 18:15:59,871 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 102 transitions. Word has length 92 [2020-08-21 18:15:59,871 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:15:59,872 INFO L479 AbstractCegarLoop]: Abstraction has 99 states and 102 transitions. [2020-08-21 18:15:59,872 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-21 18:15:59,872 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 102 transitions. [2020-08-21 18:15:59,873 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2020-08-21 18:15:59,873 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:15:59,873 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:15:59,873 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-21 18:15:59,873 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:15:59,873 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:15:59,873 INFO L82 PathProgramCache]: Analyzing trace with hash -665958294, now seen corresponding path program 26 times [2020-08-21 18:15:59,874 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:15:59,874 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2013419427] [2020-08-21 18:15:59,874 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:15:59,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:59,932 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:15:59,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:59,942 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 18:15:59,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:01,955 INFO L134 CoverageAnalysis]: Checked inductivity of 1161 backedges. 0 proven. 1156 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 18:16:01,955 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2013419427] [2020-08-21 18:16:01,955 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:01,955 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-21 18:16:01,956 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [709203169] [2020-08-21 18:16:01,956 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-21 18:16:01,956 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:01,956 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-21 18:16:01,957 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=672, Invalid=888, Unknown=0, NotChecked=0, Total=1560 [2020-08-21 18:16:01,957 INFO L87 Difference]: Start difference. First operand 99 states and 102 transitions. Second operand 40 states. [2020-08-21 18:16:02,253 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:02,253 INFO L93 Difference]: Finished difference Result 124 states and 130 transitions. [2020-08-21 18:16:02,254 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-21 18:16:02,254 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 94 [2020-08-21 18:16:02,254 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:02,255 INFO L225 Difference]: With dead ends: 124 [2020-08-21 18:16:02,255 INFO L226 Difference]: Without dead ends: 102 [2020-08-21 18:16:02,257 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=754, Invalid=1052, Unknown=0, NotChecked=0, Total=1806 [2020-08-21 18:16:02,257 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2020-08-21 18:16:02,261 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 101. [2020-08-21 18:16:02,261 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2020-08-21 18:16:02,261 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 104 transitions. [2020-08-21 18:16:02,262 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 104 transitions. Word has length 94 [2020-08-21 18:16:02,262 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:02,262 INFO L479 AbstractCegarLoop]: Abstraction has 101 states and 104 transitions. [2020-08-21 18:16:02,262 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-21 18:16:02,262 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 104 transitions. [2020-08-21 18:16:02,263 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-08-21 18:16:02,263 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:02,263 INFO L422 BasicCegarLoop]: trace histogram [35, 35, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:02,263 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-21 18:16:02,264 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:02,264 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:02,264 INFO L82 PathProgramCache]: Analyzing trace with hash 360351468, now seen corresponding path program 27 times [2020-08-21 18:16:02,264 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:02,264 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [203128597] [2020-08-21 18:16:02,264 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:02,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:02,326 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:02,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:02,336 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 18:16:02,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:04,457 INFO L134 CoverageAnalysis]: Checked inductivity of 1230 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 18:16:04,458 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [203128597] [2020-08-21 18:16:04,458 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:04,458 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-21 18:16:04,458 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1602785066] [2020-08-21 18:16:04,458 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-21 18:16:04,459 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:04,459 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-21 18:16:04,460 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=709, Invalid=931, Unknown=0, NotChecked=0, Total=1640 [2020-08-21 18:16:04,460 INFO L87 Difference]: Start difference. First operand 101 states and 104 transitions. Second operand 41 states. [2020-08-21 18:16:04,793 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:04,793 INFO L93 Difference]: Finished difference Result 126 states and 132 transitions. [2020-08-21 18:16:04,794 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-21 18:16:04,794 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 96 [2020-08-21 18:16:04,794 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:04,795 INFO L225 Difference]: With dead ends: 126 [2020-08-21 18:16:04,796 INFO L226 Difference]: Without dead ends: 104 [2020-08-21 18:16:04,797 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=793, Invalid=1099, Unknown=0, NotChecked=0, Total=1892 [2020-08-21 18:16:04,797 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2020-08-21 18:16:04,801 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 103. [2020-08-21 18:16:04,801 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2020-08-21 18:16:04,802 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 106 transitions. [2020-08-21 18:16:04,802 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 106 transitions. Word has length 96 [2020-08-21 18:16:04,802 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:04,802 INFO L479 AbstractCegarLoop]: Abstraction has 103 states and 106 transitions. [2020-08-21 18:16:04,802 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-21 18:16:04,802 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 106 transitions. [2020-08-21 18:16:04,803 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2020-08-21 18:16:04,803 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:04,803 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:04,804 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-21 18:16:04,804 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:04,804 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:04,804 INFO L82 PathProgramCache]: Analyzing trace with hash -1198445330, now seen corresponding path program 28 times [2020-08-21 18:16:04,804 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:04,804 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1815260437] [2020-08-21 18:16:04,805 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:04,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:04,864 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:04,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:04,876 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 18:16:04,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:07,128 INFO L134 CoverageAnalysis]: Checked inductivity of 1301 backedges. 0 proven. 1296 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 18:16:07,128 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1815260437] [2020-08-21 18:16:07,129 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:07,129 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-21 18:16:07,129 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1485790599] [2020-08-21 18:16:07,129 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-21 18:16:07,129 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:07,129 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-21 18:16:07,130 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=747, Invalid=975, Unknown=0, NotChecked=0, Total=1722 [2020-08-21 18:16:07,130 INFO L87 Difference]: Start difference. First operand 103 states and 106 transitions. Second operand 42 states. [2020-08-21 18:16:07,539 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:07,539 INFO L93 Difference]: Finished difference Result 128 states and 134 transitions. [2020-08-21 18:16:07,539 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-21 18:16:07,540 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 98 [2020-08-21 18:16:07,540 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:07,541 INFO L225 Difference]: With dead ends: 128 [2020-08-21 18:16:07,541 INFO L226 Difference]: Without dead ends: 106 [2020-08-21 18:16:07,542 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=833, Invalid=1147, Unknown=0, NotChecked=0, Total=1980 [2020-08-21 18:16:07,542 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2020-08-21 18:16:07,546 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 105. [2020-08-21 18:16:07,546 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2020-08-21 18:16:07,547 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 108 transitions. [2020-08-21 18:16:07,547 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 108 transitions. Word has length 98 [2020-08-21 18:16:07,548 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:07,548 INFO L479 AbstractCegarLoop]: Abstraction has 105 states and 108 transitions. [2020-08-21 18:16:07,548 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-21 18:16:07,548 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 108 transitions. [2020-08-21 18:16:07,549 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2020-08-21 18:16:07,549 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:07,549 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:07,549 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-21 18:16:07,550 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:07,550 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:07,550 INFO L82 PathProgramCache]: Analyzing trace with hash -258581904, now seen corresponding path program 29 times [2020-08-21 18:16:07,550 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:07,550 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [387224264] [2020-08-21 18:16:07,550 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:07,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:07,611 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:07,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:07,621 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 18:16:07,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:09,942 INFO L134 CoverageAnalysis]: Checked inductivity of 1374 backedges. 0 proven. 1369 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 18:16:09,942 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [387224264] [2020-08-21 18:16:09,943 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:09,943 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-21 18:16:09,943 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1440349075] [2020-08-21 18:16:09,943 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-21 18:16:09,943 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:09,944 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-21 18:16:09,945 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=786, Invalid=1020, Unknown=0, NotChecked=0, Total=1806 [2020-08-21 18:16:09,945 INFO L87 Difference]: Start difference. First operand 105 states and 108 transitions. Second operand 43 states. [2020-08-21 18:16:10,485 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:10,485 INFO L93 Difference]: Finished difference Result 130 states and 136 transitions. [2020-08-21 18:16:10,486 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-08-21 18:16:10,486 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 100 [2020-08-21 18:16:10,487 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:10,487 INFO L225 Difference]: With dead ends: 130 [2020-08-21 18:16:10,487 INFO L226 Difference]: Without dead ends: 108 [2020-08-21 18:16:10,488 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=874, Invalid=1196, Unknown=0, NotChecked=0, Total=2070 [2020-08-21 18:16:10,489 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-08-21 18:16:10,493 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 107. [2020-08-21 18:16:10,493 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2020-08-21 18:16:10,494 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 110 transitions. [2020-08-21 18:16:10,494 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 110 transitions. Word has length 100 [2020-08-21 18:16:10,494 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:10,494 INFO L479 AbstractCegarLoop]: Abstraction has 107 states and 110 transitions. [2020-08-21 18:16:10,494 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-21 18:16:10,494 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 110 transitions. [2020-08-21 18:16:10,495 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2020-08-21 18:16:10,495 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:10,495 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:10,495 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-08-21 18:16:10,495 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:10,496 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:10,496 INFO L82 PathProgramCache]: Analyzing trace with hash 1007038322, now seen corresponding path program 30 times [2020-08-21 18:16:10,496 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:10,496 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1509787371] [2020-08-21 18:16:10,496 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:10,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:10,554 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:10,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:10,565 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 18:16:10,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:13,033 INFO L134 CoverageAnalysis]: Checked inductivity of 1449 backedges. 0 proven. 1444 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 18:16:13,034 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1509787371] [2020-08-21 18:16:13,034 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:13,034 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44] total 44 [2020-08-21 18:16:13,034 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [474472592] [2020-08-21 18:16:13,034 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-08-21 18:16:13,035 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:13,035 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-08-21 18:16:13,035 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=826, Invalid=1066, Unknown=0, NotChecked=0, Total=1892 [2020-08-21 18:16:13,036 INFO L87 Difference]: Start difference. First operand 107 states and 110 transitions. Second operand 44 states. [2020-08-21 18:16:13,391 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:13,391 INFO L93 Difference]: Finished difference Result 132 states and 138 transitions. [2020-08-21 18:16:13,391 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-08-21 18:16:13,391 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 102 [2020-08-21 18:16:13,392 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:13,393 INFO L225 Difference]: With dead ends: 132 [2020-08-21 18:16:13,393 INFO L226 Difference]: Without dead ends: 110 [2020-08-21 18:16:13,394 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=916, Invalid=1246, Unknown=0, NotChecked=0, Total=2162 [2020-08-21 18:16:13,395 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2020-08-21 18:16:13,399 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 109. [2020-08-21 18:16:13,399 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 109 states. [2020-08-21 18:16:13,399 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 112 transitions. [2020-08-21 18:16:13,400 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 112 transitions. Word has length 102 [2020-08-21 18:16:13,400 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:13,400 INFO L479 AbstractCegarLoop]: Abstraction has 109 states and 112 transitions. [2020-08-21 18:16:13,400 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-08-21 18:16:13,400 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 112 transitions. [2020-08-21 18:16:13,401 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2020-08-21 18:16:13,401 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:13,401 INFO L422 BasicCegarLoop]: trace histogram [39, 39, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:13,401 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2020-08-21 18:16:13,401 INFO L427 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:13,401 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:13,402 INFO L82 PathProgramCache]: Analyzing trace with hash 1792330740, now seen corresponding path program 31 times [2020-08-21 18:16:13,402 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:13,402 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [154681193] [2020-08-21 18:16:13,402 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:13,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:13,463 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:13,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:13,472 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 18:16:13,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat