/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5000 --traceabstraction.additional.smt.options interpolation-heuristic=SMALLESTAMONGWIDE --traceabstraction.additional.smt.options tolerance=0.5 --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-industry-pattern/array_of_struct_ptr_flag_init.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-22 06:23:24,368 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-22 06:23:24,371 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-22 06:23:24,419 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-08-22 06:23:24,444 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-22 06:23:24,447 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-22 06:23:24,448 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-22 06:23:24,451 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-22 06:23:24,452 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-22 06:23:24,453 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-22 06:23:24,454 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-22 06:23:24,458 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-22 06:23:24,460 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-22 06:23:24,461 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-22 06:23:24,462 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-22 06:23:24,462 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-22 06:23:24,465 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-22 06:23:24,471 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-22 06:23:24,472 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-22 06:23:24,473 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-22 06:23:24,474 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-22 06:23:24,497 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-22 06:23:24,497 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-22 06:23:24,498 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-22 06:23:24,498 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-22 06:23:24,499 INFO L138 SettingsManager]: * Use SBE=true [2020-08-22 06:23:24,499 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-22 06:23:24,499 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-22 06:23:24,499 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-22 06:23:24,499 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-22 06:23:24,500 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-22 06:23:24,500 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-22 06:23:24,500 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-22 06:23:24,500 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-22 06:23:24,500 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-22 06:23:24,501 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-22 06:23:24,501 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-22 06:23:24,501 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-22 06:23:24,501 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-22 06:23:24,501 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-22 06:23:24,502 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-22 06:23:24,502 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-22 06:23:24,502 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-22 06:23:24,502 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-22 06:23:24,502 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-22 06:23:24,503 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-22 06:23:24,503 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-22 06:23:24,503 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-22 06:23:24,503 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-22 06:23:24,503 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-22 06:23:24,504 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.5;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.5;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.5;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.5;log-additional-information=true; [2020-08-22 06:23:24,813 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-22 06:23:24,830 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-22 06:23:24,833 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-22 06:23:24,836 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-22 06:23:24,836 INFO L275 PluginConnector]: CDTParser initialized [2020-08-22 06:23:24,837 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-industry-pattern/array_of_struct_ptr_flag_init.i [2020-08-22 06:23:24,911 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/98fec313b/08d841b2676e497ba5a84cb526267db6/FLAG091ddf69d [2020-08-22 06:23:25,373 INFO L306 CDTParser]: Found 1 translation units. [2020-08-22 06:23:25,374 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/array-industry-pattern/array_of_struct_ptr_flag_init.i [2020-08-22 06:23:25,381 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/98fec313b/08d841b2676e497ba5a84cb526267db6/FLAG091ddf69d [2020-08-22 06:23:25,750 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/98fec313b/08d841b2676e497ba5a84cb526267db6 [2020-08-22 06:23:25,763 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-22 06:23:25,765 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-22 06:23:25,767 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-22 06:23:25,767 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-22 06:23:25,771 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-22 06:23:25,772 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 06:23:25" (1/1) ... [2020-08-22 06:23:25,775 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@601fc90f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:23:25, skipping insertion in model container [2020-08-22 06:23:25,776 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 06:23:25" (1/1) ... [2020-08-22 06:23:25,784 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-22 06:23:25,805 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-22 06:23:25,984 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 06:23:25,992 INFO L203 MainTranslator]: Completed pre-run [2020-08-22 06:23:26,013 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 06:23:26,031 INFO L208 MainTranslator]: Completed translation [2020-08-22 06:23:26,031 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:23:26 WrapperNode [2020-08-22 06:23:26,031 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-22 06:23:26,032 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-22 06:23:26,032 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-22 06:23:26,032 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-22 06:23:26,141 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:23:26" (1/1) ... [2020-08-22 06:23:26,141 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:23:26" (1/1) ... [2020-08-22 06:23:26,150 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:23:26" (1/1) ... [2020-08-22 06:23:26,150 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:23:26" (1/1) ... [2020-08-22 06:23:26,166 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:23:26" (1/1) ... [2020-08-22 06:23:26,174 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:23:26" (1/1) ... [2020-08-22 06:23:26,175 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:23:26" (1/1) ... [2020-08-22 06:23:26,177 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-22 06:23:26,178 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-22 06:23:26,178 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-22 06:23:26,178 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-22 06:23:26,179 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:23:26" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-22 06:23:26,236 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-22 06:23:26,236 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-22 06:23:26,237 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-22 06:23:26,237 INFO L138 BoogieDeclarations]: Found implementation of procedure init [2020-08-22 06:23:26,237 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-22 06:23:26,237 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2020-08-22 06:23:26,237 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-22 06:23:26,237 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-22 06:23:26,238 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-08-22 06:23:26,238 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-08-22 06:23:26,238 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-08-22 06:23:26,238 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-22 06:23:26,238 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-22 06:23:26,238 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-08-22 06:23:26,239 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-22 06:23:26,239 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-22 06:23:26,239 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-22 06:23:26,531 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-22 06:23:26,532 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-08-22 06:23:26,536 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 06:23:26 BoogieIcfgContainer [2020-08-22 06:23:26,537 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-22 06:23:26,538 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-22 06:23:26,539 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-22 06:23:26,543 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-22 06:23:26,544 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.08 06:23:25" (1/3) ... [2020-08-22 06:23:26,545 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@12ed2b7c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 06:23:26, skipping insertion in model container [2020-08-22 06:23:26,545 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:23:26" (2/3) ... [2020-08-22 06:23:26,545 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@12ed2b7c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 06:23:26, skipping insertion in model container [2020-08-22 06:23:26,545 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 06:23:26" (3/3) ... [2020-08-22 06:23:26,548 INFO L109 eAbstractionObserver]: Analyzing ICFG array_of_struct_ptr_flag_init.i [2020-08-22 06:23:26,563 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-22 06:23:26,572 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-22 06:23:26,598 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-22 06:23:26,660 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-22 06:23:26,660 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-22 06:23:26,660 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-22 06:23:26,660 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-22 06:23:26,661 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-22 06:23:26,661 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-22 06:23:26,662 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-22 06:23:26,662 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-22 06:23:26,681 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-08-22 06:23:26,686 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-22 06:23:26,686 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:23:26,687 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] [2020-08-22 06:23:26,687 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:23:26,693 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:23:26,693 INFO L82 PathProgramCache]: Analyzing trace with hash -850547107, now seen corresponding path program 1 times [2020-08-22 06:23:26,700 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:23:26,701 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [781084572] [2020-08-22 06:23:26,701 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:23:26,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:26,876 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:23:26,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:26,901 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-22 06:23:26,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:26,914 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 06:23:26,915 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [781084572] [2020-08-22 06:23:26,917 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 06:23:26,918 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-22 06:23:26,919 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [440066072] [2020-08-22 06:23:26,924 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-22 06:23:26,924 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:23:26,939 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-22 06:23:26,940 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-22 06:23:26,942 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 4 states. [2020-08-22 06:23:27,090 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:23:27,090 INFO L93 Difference]: Finished difference Result 59 states and 76 transitions. [2020-08-22 06:23:27,091 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-22 06:23:27,093 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 20 [2020-08-22 06:23:27,094 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:23:27,104 INFO L225 Difference]: With dead ends: 59 [2020-08-22 06:23:27,105 INFO L226 Difference]: Without dead ends: 31 [2020-08-22 06:23:27,109 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 [2020-08-22 06:23:27,125 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-22 06:23:27,144 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 28. [2020-08-22 06:23:27,146 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-22 06:23:27,147 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 32 transitions. [2020-08-22 06:23:27,149 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 32 transitions. Word has length 20 [2020-08-22 06:23:27,149 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:23:27,149 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 32 transitions. [2020-08-22 06:23:27,150 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-22 06:23:27,150 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 32 transitions. [2020-08-22 06:23:27,151 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-22 06:23:27,151 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:23:27,151 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] [2020-08-22 06:23:27,152 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-22 06:23:27,152 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:23:27,152 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:23:27,153 INFO L82 PathProgramCache]: Analyzing trace with hash 1453375688, now seen corresponding path program 1 times [2020-08-22 06:23:27,153 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:23:27,153 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2114048576] [2020-08-22 06:23:27,153 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:23:27,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:27,237 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:23:27,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:27,262 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-22 06:23:27,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:27,341 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 06:23:27,342 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2114048576] [2020-08-22 06:23:27,343 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 06:23:27,343 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-08-22 06:23:27,343 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [487300926] [2020-08-22 06:23:27,345 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-22 06:23:27,345 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:23:27,345 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-22 06:23:27,346 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-08-22 06:23:27,346 INFO L87 Difference]: Start difference. First operand 28 states and 32 transitions. Second operand 6 states. [2020-08-22 06:23:27,552 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:23:27,552 INFO L93 Difference]: Finished difference Result 48 states and 56 transitions. [2020-08-22 06:23:27,552 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-22 06:23:27,553 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2020-08-22 06:23:27,553 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:23:27,554 INFO L225 Difference]: With dead ends: 48 [2020-08-22 06:23:27,554 INFO L226 Difference]: Without dead ends: 30 [2020-08-22 06:23:27,556 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 [2020-08-22 06:23:27,556 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-22 06:23:27,563 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2020-08-22 06:23:27,563 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-22 06:23:27,564 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2020-08-22 06:23:27,564 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 20 [2020-08-22 06:23:27,565 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:23:27,565 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2020-08-22 06:23:27,565 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-22 06:23:27,565 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2020-08-22 06:23:27,566 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-22 06:23:27,567 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:23:27,567 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] [2020-08-22 06:23:27,567 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-22 06:23:27,567 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:23:27,582 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:23:27,582 INFO L82 PathProgramCache]: Analyzing trace with hash -169907062, now seen corresponding path program 1 times [2020-08-22 06:23:27,582 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:23:27,583 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2025516292] [2020-08-22 06:23:27,583 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:23:27,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:27,642 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:23:27,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:27,660 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-22 06:23:27,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:27,755 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 06:23:27,755 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2025516292] [2020-08-22 06:23:27,755 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:23:27,756 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-22 06:23:27,756 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [219572988] [2020-08-22 06:23:27,757 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-22 06:23:27,757 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:23:27,757 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-22 06:23:27,757 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-08-22 06:23:27,758 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand 7 states. [2020-08-22 06:23:27,918 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:23:27,918 INFO L93 Difference]: Finished difference Result 50 states and 58 transitions. [2020-08-22 06:23:27,918 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-22 06:23:27,919 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 22 [2020-08-22 06:23:27,919 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:23:27,920 INFO L225 Difference]: With dead ends: 50 [2020-08-22 06:23:27,920 INFO L226 Difference]: Without dead ends: 32 [2020-08-22 06:23:27,921 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 [2020-08-22 06:23:27,921 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-22 06:23:27,926 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2020-08-22 06:23:27,926 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-22 06:23:27,927 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 35 transitions. [2020-08-22 06:23:27,928 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 35 transitions. Word has length 22 [2020-08-22 06:23:27,928 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:23:27,928 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 35 transitions. [2020-08-22 06:23:27,928 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-22 06:23:27,928 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 35 transitions. [2020-08-22 06:23:27,929 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-22 06:23:27,929 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:23:27,929 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] [2020-08-22 06:23:27,930 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-22 06:23:27,930 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:23:27,930 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:23:27,930 INFO L82 PathProgramCache]: Analyzing trace with hash -1071501364, now seen corresponding path program 2 times [2020-08-22 06:23:27,930 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:23:27,931 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [365407207] [2020-08-22 06:23:27,931 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:23:27,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:27,975 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:23:27,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:27,990 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-22 06:23:27,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:28,137 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 06:23:28,138 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [365407207] [2020-08-22 06:23:28,138 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:23:28,139 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-22 06:23:28,139 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1804817830] [2020-08-22 06:23:28,139 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-22 06:23:28,140 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:23:28,140 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-22 06:23:28,140 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2020-08-22 06:23:28,141 INFO L87 Difference]: Start difference. First operand 31 states and 35 transitions. Second operand 8 states. [2020-08-22 06:23:28,325 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:23:28,325 INFO L93 Difference]: Finished difference Result 52 states and 60 transitions. [2020-08-22 06:23:28,326 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-22 06:23:28,326 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 24 [2020-08-22 06:23:28,326 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:23:28,327 INFO L225 Difference]: With dead ends: 52 [2020-08-22 06:23:28,327 INFO L226 Difference]: Without dead ends: 34 [2020-08-22 06:23:28,328 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 [2020-08-22 06:23:28,329 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-22 06:23:28,333 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2020-08-22 06:23:28,334 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-22 06:23:28,334 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 37 transitions. [2020-08-22 06:23:28,335 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 37 transitions. Word has length 24 [2020-08-22 06:23:28,335 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:23:28,335 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 37 transitions. [2020-08-22 06:23:28,335 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-22 06:23:28,335 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 37 transitions. [2020-08-22 06:23:28,336 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-22 06:23:28,336 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:23:28,337 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] [2020-08-22 06:23:28,337 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-22 06:23:28,337 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:23:28,337 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:23:28,338 INFO L82 PathProgramCache]: Analyzing trace with hash 79768206, now seen corresponding path program 3 times [2020-08-22 06:23:28,338 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:23:28,338 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [609942950] [2020-08-22 06:23:28,338 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:23:28,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:28,383 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:23:28,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:28,399 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-22 06:23:28,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:28,627 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 06:23:28,627 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [609942950] [2020-08-22 06:23:28,627 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:23:28,628 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-22 06:23:28,628 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1562678477] [2020-08-22 06:23:28,628 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-22 06:23:28,629 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:23:28,629 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-22 06:23:28,629 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-22 06:23:28,630 INFO L87 Difference]: Start difference. First operand 33 states and 37 transitions. Second operand 9 states. [2020-08-22 06:23:28,822 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:23:28,822 INFO L93 Difference]: Finished difference Result 54 states and 62 transitions. [2020-08-22 06:23:28,823 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-22 06:23:28,823 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-08-22 06:23:28,823 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:23:28,824 INFO L225 Difference]: With dead ends: 54 [2020-08-22 06:23:28,824 INFO L226 Difference]: Without dead ends: 36 [2020-08-22 06:23:28,825 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 [2020-08-22 06:23:28,825 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-22 06:23:28,830 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2020-08-22 06:23:28,830 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-22 06:23:28,831 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2020-08-22 06:23:28,831 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 26 [2020-08-22 06:23:28,831 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:23:28,831 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2020-08-22 06:23:28,832 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-22 06:23:28,832 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2020-08-22 06:23:28,833 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-22 06:23:28,833 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:23:28,833 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] [2020-08-22 06:23:28,833 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-22 06:23:28,833 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:23:28,834 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:23:28,834 INFO L82 PathProgramCache]: Analyzing trace with hash -1651737392, now seen corresponding path program 4 times [2020-08-22 06:23:28,834 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:23:28,835 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [894412971] [2020-08-22 06:23:28,835 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:23:28,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:28,874 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:23:28,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:28,889 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-22 06:23:28,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:29,077 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 06:23:29,078 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [894412971] [2020-08-22 06:23:29,078 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:23:29,078 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-22 06:23:29,078 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1115710094] [2020-08-22 06:23:29,079 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-22 06:23:29,079 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:23:29,080 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-22 06:23:29,080 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2020-08-22 06:23:29,080 INFO L87 Difference]: Start difference. First operand 35 states and 39 transitions. Second operand 10 states. [2020-08-22 06:23:29,251 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:23:29,251 INFO L93 Difference]: Finished difference Result 56 states and 64 transitions. [2020-08-22 06:23:29,251 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-22 06:23:29,251 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 28 [2020-08-22 06:23:29,252 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:23:29,252 INFO L225 Difference]: With dead ends: 56 [2020-08-22 06:23:29,253 INFO L226 Difference]: Without dead ends: 38 [2020-08-22 06:23:29,253 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 [2020-08-22 06:23:29,254 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-22 06:23:29,258 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2020-08-22 06:23:29,258 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-22 06:23:29,259 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 41 transitions. [2020-08-22 06:23:29,259 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 41 transitions. Word has length 28 [2020-08-22 06:23:29,260 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:23:29,260 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 41 transitions. [2020-08-22 06:23:29,260 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-22 06:23:29,260 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 41 transitions. [2020-08-22 06:23:29,261 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-22 06:23:29,261 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:23:29,261 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] [2020-08-22 06:23:29,262 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-22 06:23:29,262 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:23:29,262 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:23:29,262 INFO L82 PathProgramCache]: Analyzing trace with hash 818693778, now seen corresponding path program 5 times [2020-08-22 06:23:29,263 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:23:29,263 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [762983846] [2020-08-22 06:23:29,263 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:23:29,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:29,298 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:23:29,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:29,311 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-22 06:23:29,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:29,549 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 06:23:29,549 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [762983846] [2020-08-22 06:23:29,549 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:23:29,549 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-22 06:23:29,550 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1522260512] [2020-08-22 06:23:29,550 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-22 06:23:29,550 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:23:29,551 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-22 06:23:29,551 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2020-08-22 06:23:29,552 INFO L87 Difference]: Start difference. First operand 37 states and 41 transitions. Second operand 11 states. [2020-08-22 06:23:29,738 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:23:29,738 INFO L93 Difference]: Finished difference Result 58 states and 66 transitions. [2020-08-22 06:23:29,739 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-22 06:23:29,739 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 30 [2020-08-22 06:23:29,739 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:23:29,740 INFO L225 Difference]: With dead ends: 58 [2020-08-22 06:23:29,740 INFO L226 Difference]: Without dead ends: 40 [2020-08-22 06:23:29,741 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 [2020-08-22 06:23:29,741 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-22 06:23:29,746 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2020-08-22 06:23:29,746 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-22 06:23:29,747 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 43 transitions. [2020-08-22 06:23:29,747 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 43 transitions. Word has length 30 [2020-08-22 06:23:29,747 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:23:29,747 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 43 transitions. [2020-08-22 06:23:29,748 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-22 06:23:29,748 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 43 transitions. [2020-08-22 06:23:29,749 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-22 06:23:29,749 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:23:29,749 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] [2020-08-22 06:23:29,749 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-22 06:23:29,749 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:23:29,750 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:23:29,750 INFO L82 PathProgramCache]: Analyzing trace with hash -213866540, now seen corresponding path program 6 times [2020-08-22 06:23:29,750 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:23:29,750 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1247642292] [2020-08-22 06:23:29,751 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:23:29,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:29,785 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:23:29,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:29,797 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-22 06:23:29,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:30,043 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 06:23:30,044 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1247642292] [2020-08-22 06:23:30,044 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:23:30,044 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-22 06:23:30,044 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [795993454] [2020-08-22 06:23:30,045 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-22 06:23:30,045 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:23:30,045 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-22 06:23:30,046 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=90, Unknown=0, NotChecked=0, Total=132 [2020-08-22 06:23:30,046 INFO L87 Difference]: Start difference. First operand 39 states and 43 transitions. Second operand 12 states. [2020-08-22 06:23:30,275 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:23:30,276 INFO L93 Difference]: Finished difference Result 60 states and 68 transitions. [2020-08-22 06:23:30,284 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-22 06:23:30,284 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 32 [2020-08-22 06:23:30,284 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:23:30,285 INFO L225 Difference]: With dead ends: 60 [2020-08-22 06:23:30,285 INFO L226 Difference]: Without dead ends: 42 [2020-08-22 06:23:30,286 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=68, Invalid=142, Unknown=0, NotChecked=0, Total=210 [2020-08-22 06:23:30,286 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-22 06:23:30,291 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2020-08-22 06:23:30,291 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-22 06:23:30,292 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 45 transitions. [2020-08-22 06:23:30,292 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 45 transitions. Word has length 32 [2020-08-22 06:23:30,292 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:23:30,292 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 45 transitions. [2020-08-22 06:23:30,292 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-22 06:23:30,292 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 45 transitions. [2020-08-22 06:23:30,293 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-22 06:23:30,293 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:23:30,294 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] [2020-08-22 06:23:30,294 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-22 06:23:30,294 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:23:30,294 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:23:30,294 INFO L82 PathProgramCache]: Analyzing trace with hash -366886762, now seen corresponding path program 7 times [2020-08-22 06:23:30,295 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:23:30,295 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [521163229] [2020-08-22 06:23:30,295 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:23:30,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:30,331 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:23:30,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:30,344 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-22 06:23:30,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:30,653 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 06:23:30,654 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [521163229] [2020-08-22 06:23:30,654 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:23:30,654 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-22 06:23:30,657 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1505378904] [2020-08-22 06:23:30,657 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-22 06:23:30,659 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:23:30,659 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-22 06:23:30,660 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=105, Unknown=0, NotChecked=0, Total=156 [2020-08-22 06:23:30,660 INFO L87 Difference]: Start difference. First operand 41 states and 45 transitions. Second operand 13 states. [2020-08-22 06:23:30,884 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:23:30,884 INFO L93 Difference]: Finished difference Result 62 states and 70 transitions. [2020-08-22 06:23:30,885 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-22 06:23:30,885 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 34 [2020-08-22 06:23:30,885 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:23:30,886 INFO L225 Difference]: With dead ends: 62 [2020-08-22 06:23:30,886 INFO L226 Difference]: Without dead ends: 44 [2020-08-22 06:23:30,888 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 [2020-08-22 06:23:30,889 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-22 06:23:30,894 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2020-08-22 06:23:30,894 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-22 06:23:30,897 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 47 transitions. [2020-08-22 06:23:30,897 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 47 transitions. Word has length 34 [2020-08-22 06:23:30,897 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:23:30,898 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 47 transitions. [2020-08-22 06:23:30,898 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-22 06:23:30,898 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 47 transitions. [2020-08-22 06:23:30,901 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-22 06:23:30,903 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:23:30,903 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] [2020-08-22 06:23:30,903 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-22 06:23:30,903 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:23:30,903 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:23:30,904 INFO L82 PathProgramCache]: Analyzing trace with hash -1390432040, now seen corresponding path program 8 times [2020-08-22 06:23:30,904 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:23:30,904 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1586994613] [2020-08-22 06:23:30,905 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:23:30,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:30,973 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:23:30,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:30,984 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-22 06:23:30,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:31,354 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 06:23:31,354 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1586994613] [2020-08-22 06:23:31,355 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:23:31,355 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-22 06:23:31,355 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1791674828] [2020-08-22 06:23:31,358 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-22 06:23:31,358 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:23:31,359 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-22 06:23:31,359 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2020-08-22 06:23:31,359 INFO L87 Difference]: Start difference. First operand 43 states and 47 transitions. Second operand 14 states. [2020-08-22 06:23:31,574 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:23:31,574 INFO L93 Difference]: Finished difference Result 64 states and 72 transitions. [2020-08-22 06:23:31,575 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-22 06:23:31,575 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 36 [2020-08-22 06:23:31,575 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:23:31,576 INFO L225 Difference]: With dead ends: 64 [2020-08-22 06:23:31,576 INFO L226 Difference]: Without dead ends: 46 [2020-08-22 06:23:31,577 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 [2020-08-22 06:23:31,577 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-22 06:23:31,586 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2020-08-22 06:23:31,586 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-22 06:23:31,587 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 49 transitions. [2020-08-22 06:23:31,587 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 49 transitions. Word has length 36 [2020-08-22 06:23:31,587 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:23:31,588 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 49 transitions. [2020-08-22 06:23:31,588 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-22 06:23:31,588 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 49 transitions. [2020-08-22 06:23:31,588 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-22 06:23:31,590 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:23:31,590 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] [2020-08-22 06:23:31,590 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-22 06:23:31,590 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:23:31,591 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:23:31,591 INFO L82 PathProgramCache]: Analyzing trace with hash -1469933414, now seen corresponding path program 9 times [2020-08-22 06:23:31,591 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:23:31,592 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [14378442] [2020-08-22 06:23:31,592 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:23:31,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:31,640 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:23:31,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:31,654 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-22 06:23:31,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:31,668 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2020-08-22 06:23:31,668 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [14378442] [2020-08-22 06:23:31,668 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 06:23:31,668 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-22 06:23:31,669 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1806604180] [2020-08-22 06:23:31,669 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-22 06:23:31,670 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:23:31,670 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-22 06:23:31,670 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-22 06:23:31,670 INFO L87 Difference]: Start difference. First operand 45 states and 49 transitions. Second operand 5 states. [2020-08-22 06:23:31,750 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:23:31,750 INFO L93 Difference]: Finished difference Result 65 states and 74 transitions. [2020-08-22 06:23:31,750 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-22 06:23:31,751 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 38 [2020-08-22 06:23:31,751 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:23:31,753 INFO L225 Difference]: With dead ends: 65 [2020-08-22 06:23:31,753 INFO L226 Difference]: Without dead ends: 53 [2020-08-22 06:23:31,754 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 [2020-08-22 06:23:31,754 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-08-22 06:23:31,763 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 46. [2020-08-22 06:23:31,763 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-22 06:23:31,764 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 50 transitions. [2020-08-22 06:23:31,764 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 50 transitions. Word has length 38 [2020-08-22 06:23:31,765 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:23:31,765 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 50 transitions. [2020-08-22 06:23:31,765 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-22 06:23:31,765 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 50 transitions. [2020-08-22 06:23:31,766 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-22 06:23:31,766 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:23:31,766 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] [2020-08-22 06:23:31,766 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-22 06:23:31,766 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:23:31,766 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:23:31,767 INFO L82 PathProgramCache]: Analyzing trace with hash -1568016950, now seen corresponding path program 1 times [2020-08-22 06:23:31,767 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:23:31,767 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [791817880] [2020-08-22 06:23:31,767 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:23:31,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:31,805 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:23:31,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:31,817 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-22 06:23:31,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:31,829 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2020-08-22 06:23:31,829 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [791817880] [2020-08-22 06:23:31,830 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:23:31,830 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-22 06:23:31,830 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1436330725] [2020-08-22 06:23:31,830 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-22 06:23:31,831 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:23:31,831 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-22 06:23:31,831 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-08-22 06:23:31,831 INFO L87 Difference]: Start difference. First operand 46 states and 50 transitions. Second operand 6 states. [2020-08-22 06:23:31,924 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:23:31,924 INFO L93 Difference]: Finished difference Result 73 states and 85 transitions. [2020-08-22 06:23:31,925 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-22 06:23:31,925 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 41 [2020-08-22 06:23:31,925 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:23:31,926 INFO L225 Difference]: With dead ends: 73 [2020-08-22 06:23:31,926 INFO L226 Difference]: Without dead ends: 61 [2020-08-22 06:23:31,927 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 [2020-08-22 06:23:31,927 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-08-22 06:23:31,932 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 49. [2020-08-22 06:23:31,932 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-22 06:23:31,933 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 54 transitions. [2020-08-22 06:23:31,933 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 54 transitions. Word has length 41 [2020-08-22 06:23:31,933 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:23:31,933 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 54 transitions. [2020-08-22 06:23:31,933 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-22 06:23:31,934 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 54 transitions. [2020-08-22 06:23:31,934 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-22 06:23:31,934 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:23:31,934 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] [2020-08-22 06:23:31,935 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-22 06:23:31,935 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:23:31,935 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:23:31,935 INFO L82 PathProgramCache]: Analyzing trace with hash 1298090650, now seen corresponding path program 2 times [2020-08-22 06:23:31,936 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:23:31,936 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1169564752] [2020-08-22 06:23:31,936 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:23:31,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:31,977 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:23:31,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:31,989 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-22 06:23:31,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:32,000 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 83 trivial. 0 not checked. [2020-08-22 06:23:32,001 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1169564752] [2020-08-22 06:23:32,001 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 06:23:32,001 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-22 06:23:32,002 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [971477460] [2020-08-22 06:23:32,002 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-22 06:23:32,002 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:23:32,002 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-22 06:23:32,003 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-22 06:23:32,003 INFO L87 Difference]: Start difference. First operand 49 states and 54 transitions. Second operand 5 states. [2020-08-22 06:23:32,082 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:23:32,082 INFO L93 Difference]: Finished difference Result 69 states and 78 transitions. [2020-08-22 06:23:32,083 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-22 06:23:32,083 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 44 [2020-08-22 06:23:32,083 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:23:32,084 INFO L225 Difference]: With dead ends: 69 [2020-08-22 06:23:32,084 INFO L226 Difference]: Without dead ends: 49 [2020-08-22 06:23:32,084 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 [2020-08-22 06:23:32,085 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-22 06:23:32,088 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-22 06:23:32,088 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-22 06:23:32,089 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 52 transitions. [2020-08-22 06:23:32,089 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 52 transitions. Word has length 44 [2020-08-22 06:23:32,089 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:23:32,090 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 52 transitions. [2020-08-22 06:23:32,090 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-22 06:23:32,090 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 52 transitions. [2020-08-22 06:23:32,090 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-22 06:23:32,090 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:23:32,091 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] [2020-08-22 06:23:32,091 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-22 06:23:32,091 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:23:32,091 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:23:32,091 INFO L82 PathProgramCache]: Analyzing trace with hash 318257626, now seen corresponding path program 1 times [2020-08-22 06:23:32,091 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:23:32,091 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [618631618] [2020-08-22 06:23:32,092 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:23:32,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:32,165 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:23:32,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:32,191 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-22 06:23:32,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:32,652 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-22 06:23:32,652 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [618631618] [2020-08-22 06:23:32,653 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:23:32,653 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-22 06:23:32,653 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [307025098] [2020-08-22 06:23:32,654 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-22 06:23:32,654 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:23:32,655 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-22 06:23:32,655 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=138, Unknown=0, NotChecked=0, Total=210 [2020-08-22 06:23:32,655 INFO L87 Difference]: Start difference. First operand 49 states and 52 transitions. Second operand 15 states. [2020-08-22 06:23:32,876 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:23:32,877 INFO L93 Difference]: Finished difference Result 74 states and 80 transitions. [2020-08-22 06:23:32,877 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-22 06:23:32,877 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 44 [2020-08-22 06:23:32,877 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:23:32,878 INFO L225 Difference]: With dead ends: 74 [2020-08-22 06:23:32,878 INFO L226 Difference]: Without dead ends: 52 [2020-08-22 06:23:32,879 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 [2020-08-22 06:23:32,880 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-22 06:23:32,886 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2020-08-22 06:23:32,886 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-22 06:23:32,887 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 54 transitions. [2020-08-22 06:23:32,887 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 54 transitions. Word has length 44 [2020-08-22 06:23:32,887 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:23:32,887 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 54 transitions. [2020-08-22 06:23:32,887 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-22 06:23:32,888 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 54 transitions. [2020-08-22 06:23:32,888 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-22 06:23:32,888 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:23:32,888 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] [2020-08-22 06:23:32,889 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-22 06:23:32,889 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:23:32,889 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:23:32,889 INFO L82 PathProgramCache]: Analyzing trace with hash -935313508, now seen corresponding path program 2 times [2020-08-22 06:23:32,889 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:23:32,890 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1287725854] [2020-08-22 06:23:32,890 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:23:32,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:32,931 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:23:32,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:32,942 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-22 06:23:32,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:33,363 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-22 06:23:33,363 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1287725854] [2020-08-22 06:23:33,363 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:23:33,363 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-22 06:23:33,364 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [612023170] [2020-08-22 06:23:33,364 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-22 06:23:33,364 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:23:33,364 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-22 06:23:33,364 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=156, Unknown=0, NotChecked=0, Total=240 [2020-08-22 06:23:33,365 INFO L87 Difference]: Start difference. First operand 51 states and 54 transitions. Second operand 16 states. [2020-08-22 06:23:33,588 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:23:33,588 INFO L93 Difference]: Finished difference Result 76 states and 82 transitions. [2020-08-22 06:23:33,588 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-22 06:23:33,589 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 46 [2020-08-22 06:23:33,589 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:23:33,589 INFO L225 Difference]: With dead ends: 76 [2020-08-22 06:23:33,590 INFO L226 Difference]: Without dead ends: 54 [2020-08-22 06:23:33,590 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 [2020-08-22 06:23:33,591 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-22 06:23:33,598 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2020-08-22 06:23:33,599 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-22 06:23:33,599 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 56 transitions. [2020-08-22 06:23:33,600 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 56 transitions. Word has length 46 [2020-08-22 06:23:33,602 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:23:33,602 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 56 transitions. [2020-08-22 06:23:33,602 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-22 06:23:33,603 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 56 transitions. [2020-08-22 06:23:33,603 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-22 06:23:33,603 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:23:33,604 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] [2020-08-22 06:23:33,604 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-22 06:23:33,604 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:23:33,605 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:23:33,605 INFO L82 PathProgramCache]: Analyzing trace with hash 1268636894, now seen corresponding path program 3 times [2020-08-22 06:23:33,605 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:23:33,606 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [121879542] [2020-08-22 06:23:33,606 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:23:33,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:33,656 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:23:33,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:33,687 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-22 06:23:33,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:34,158 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-22 06:23:34,158 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [121879542] [2020-08-22 06:23:34,159 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:23:34,159 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-22 06:23:34,159 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [648976894] [2020-08-22 06:23:34,159 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-22 06:23:34,160 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:23:34,160 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-22 06:23:34,161 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=175, Unknown=0, NotChecked=0, Total=272 [2020-08-22 06:23:34,161 INFO L87 Difference]: Start difference. First operand 53 states and 56 transitions. Second operand 17 states. [2020-08-22 06:23:34,411 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:23:34,411 INFO L93 Difference]: Finished difference Result 78 states and 84 transitions. [2020-08-22 06:23:34,412 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-22 06:23:34,412 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 48 [2020-08-22 06:23:34,412 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:23:34,413 INFO L225 Difference]: With dead ends: 78 [2020-08-22 06:23:34,413 INFO L226 Difference]: Without dead ends: 56 [2020-08-22 06:23:34,414 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=133, Invalid=247, Unknown=0, NotChecked=0, Total=380 [2020-08-22 06:23:34,414 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-08-22 06:23:34,423 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2020-08-22 06:23:34,423 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-22 06:23:34,424 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 58 transitions. [2020-08-22 06:23:34,424 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 58 transitions. Word has length 48 [2020-08-22 06:23:34,425 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:23:34,425 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 58 transitions. [2020-08-22 06:23:34,425 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-22 06:23:34,425 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 58 transitions. [2020-08-22 06:23:34,426 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-22 06:23:34,426 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:23:34,426 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] [2020-08-22 06:23:34,426 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-22 06:23:34,426 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:23:34,426 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:23:34,427 INFO L82 PathProgramCache]: Analyzing trace with hash 1846096288, now seen corresponding path program 4 times [2020-08-22 06:23:34,427 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:23:34,427 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [268731185] [2020-08-22 06:23:34,427 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:23:34,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:34,472 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:23:34,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:34,483 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-22 06:23:34,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:35,013 INFO L134 CoverageAnalysis]: Checked inductivity of 149 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-22 06:23:35,013 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [268731185] [2020-08-22 06:23:35,013 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:23:35,014 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-22 06:23:35,014 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1819419892] [2020-08-22 06:23:35,015 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-22 06:23:35,015 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:23:35,016 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-22 06:23:35,016 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=195, Unknown=0, NotChecked=0, Total=306 [2020-08-22 06:23:35,016 INFO L87 Difference]: Start difference. First operand 55 states and 58 transitions. Second operand 18 states. [2020-08-22 06:23:35,263 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:23:35,263 INFO L93 Difference]: Finished difference Result 80 states and 86 transitions. [2020-08-22 06:23:35,263 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-22 06:23:35,263 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 50 [2020-08-22 06:23:35,264 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:23:35,264 INFO L225 Difference]: With dead ends: 80 [2020-08-22 06:23:35,264 INFO L226 Difference]: Without dead ends: 58 [2020-08-22 06:23:35,265 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 [2020-08-22 06:23:35,265 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-22 06:23:35,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2020-08-22 06:23:35,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-22 06:23:35,270 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 60 transitions. [2020-08-22 06:23:35,270 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 60 transitions. Word has length 50 [2020-08-22 06:23:35,270 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:23:35,270 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 60 transitions. [2020-08-22 06:23:35,271 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-22 06:23:35,271 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 60 transitions. [2020-08-22 06:23:35,271 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-22 06:23:35,272 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:23:35,272 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] [2020-08-22 06:23:35,272 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-22 06:23:35,272 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:23:35,272 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:23:35,272 INFO L82 PathProgramCache]: Analyzing trace with hash -1561174558, now seen corresponding path program 5 times [2020-08-22 06:23:35,273 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:23:35,273 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1975707349] [2020-08-22 06:23:35,273 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:23:35,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:35,307 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:23:35,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:35,319 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-22 06:23:35,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:35,866 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-22 06:23:35,866 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1975707349] [2020-08-22 06:23:35,867 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:23:35,867 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-22 06:23:35,867 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1469266392] [2020-08-22 06:23:35,867 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-22 06:23:35,867 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:23:35,868 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-22 06:23:35,868 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=216, Unknown=0, NotChecked=0, Total=342 [2020-08-22 06:23:35,868 INFO L87 Difference]: Start difference. First operand 57 states and 60 transitions. Second operand 19 states. [2020-08-22 06:23:36,145 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:23:36,145 INFO L93 Difference]: Finished difference Result 82 states and 88 transitions. [2020-08-22 06:23:36,146 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-22 06:23:36,146 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 52 [2020-08-22 06:23:36,146 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:23:36,147 INFO L225 Difference]: With dead ends: 82 [2020-08-22 06:23:36,147 INFO L226 Difference]: Without dead ends: 60 [2020-08-22 06:23:36,148 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=166, Invalid=296, Unknown=0, NotChecked=0, Total=462 [2020-08-22 06:23:36,149 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-08-22 06:23:36,152 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 59. [2020-08-22 06:23:36,153 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-08-22 06:23:36,153 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 62 transitions. [2020-08-22 06:23:36,153 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 62 transitions. Word has length 52 [2020-08-22 06:23:36,154 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:23:36,154 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 62 transitions. [2020-08-22 06:23:36,154 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-22 06:23:36,154 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 62 transitions. [2020-08-22 06:23:36,154 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-22 06:23:36,155 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:23:36,155 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] [2020-08-22 06:23:36,155 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-22 06:23:36,155 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:23:36,155 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:23:36,156 INFO L82 PathProgramCache]: Analyzing trace with hash 1111589284, now seen corresponding path program 6 times [2020-08-22 06:23:36,156 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:23:36,156 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1592341942] [2020-08-22 06:23:36,156 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:23:36,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:36,193 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:23:36,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:36,204 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-22 06:23:36,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:36,984 INFO L134 CoverageAnalysis]: Checked inductivity of 201 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-22 06:23:36,984 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1592341942] [2020-08-22 06:23:36,985 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:23:36,985 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-22 06:23:36,985 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [345030250] [2020-08-22 06:23:36,987 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-22 06:23:36,987 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:23:36,988 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-22 06:23:36,988 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=142, Invalid=238, Unknown=0, NotChecked=0, Total=380 [2020-08-22 06:23:36,988 INFO L87 Difference]: Start difference. First operand 59 states and 62 transitions. Second operand 20 states. [2020-08-22 06:23:37,283 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:23:37,283 INFO L93 Difference]: Finished difference Result 84 states and 90 transitions. [2020-08-22 06:23:37,283 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-22 06:23:37,284 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 54 [2020-08-22 06:23:37,284 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:23:37,284 INFO L225 Difference]: With dead ends: 84 [2020-08-22 06:23:37,284 INFO L226 Difference]: Without dead ends: 62 [2020-08-22 06:23:37,285 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=184, Invalid=322, Unknown=0, NotChecked=0, Total=506 [2020-08-22 06:23:37,285 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-08-22 06:23:37,289 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2020-08-22 06:23:37,290 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-08-22 06:23:37,293 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 64 transitions. [2020-08-22 06:23:37,295 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 64 transitions. Word has length 54 [2020-08-22 06:23:37,295 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:23:37,295 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 64 transitions. [2020-08-22 06:23:37,295 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-22 06:23:37,296 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 64 transitions. [2020-08-22 06:23:37,296 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-22 06:23:37,296 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:23:37,296 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] [2020-08-22 06:23:37,297 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-22 06:23:37,297 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:23:37,297 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:23:37,297 INFO L82 PathProgramCache]: Analyzing trace with hash 1247198438, now seen corresponding path program 7 times [2020-08-22 06:23:37,297 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:23:37,298 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1460646851] [2020-08-22 06:23:37,298 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:23:37,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:37,361 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:23:37,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:37,371 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-22 06:23:37,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:38,070 INFO L134 CoverageAnalysis]: Checked inductivity of 230 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-22 06:23:38,071 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1460646851] [2020-08-22 06:23:38,071 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:23:38,071 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-22 06:23:38,071 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1180233139] [2020-08-22 06:23:38,071 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-22 06:23:38,072 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:23:38,072 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-22 06:23:38,072 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=159, Invalid=261, Unknown=0, NotChecked=0, Total=420 [2020-08-22 06:23:38,072 INFO L87 Difference]: Start difference. First operand 61 states and 64 transitions. Second operand 21 states. [2020-08-22 06:23:38,328 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:23:38,328 INFO L93 Difference]: Finished difference Result 86 states and 92 transitions. [2020-08-22 06:23:38,329 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-22 06:23:38,329 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 56 [2020-08-22 06:23:38,329 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:23:38,330 INFO L225 Difference]: With dead ends: 86 [2020-08-22 06:23:38,330 INFO L226 Difference]: Without dead ends: 64 [2020-08-22 06:23:38,333 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 [2020-08-22 06:23:38,333 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-08-22 06:23:38,340 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2020-08-22 06:23:38,340 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2020-08-22 06:23:38,341 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 66 transitions. [2020-08-22 06:23:38,342 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 66 transitions. Word has length 56 [2020-08-22 06:23:38,342 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:23:38,342 INFO L479 AbstractCegarLoop]: Abstraction has 63 states and 66 transitions. [2020-08-22 06:23:38,342 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-22 06:23:38,343 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 66 transitions. [2020-08-22 06:23:38,343 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-08-22 06:23:38,343 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:23:38,344 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] [2020-08-22 06:23:38,344 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-22 06:23:38,344 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:23:38,344 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:23:38,344 INFO L82 PathProgramCache]: Analyzing trace with hash -1576390744, now seen corresponding path program 8 times [2020-08-22 06:23:38,345 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:23:38,345 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [346654018] [2020-08-22 06:23:38,345 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:23:38,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:38,400 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:23:38,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:38,426 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-22 06:23:38,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:39,179 INFO L134 CoverageAnalysis]: Checked inductivity of 261 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-22 06:23:39,180 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [346654018] [2020-08-22 06:23:39,180 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:23:39,180 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-22 06:23:39,180 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [722087029] [2020-08-22 06:23:39,181 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-22 06:23:39,181 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:23:39,181 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-22 06:23:39,181 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=177, Invalid=285, Unknown=0, NotChecked=0, Total=462 [2020-08-22 06:23:39,182 INFO L87 Difference]: Start difference. First operand 63 states and 66 transitions. Second operand 22 states. [2020-08-22 06:23:39,512 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:23:39,513 INFO L93 Difference]: Finished difference Result 88 states and 94 transitions. [2020-08-22 06:23:39,513 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-22 06:23:39,513 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 58 [2020-08-22 06:23:39,514 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:23:39,514 INFO L225 Difference]: With dead ends: 88 [2020-08-22 06:23:39,515 INFO L226 Difference]: Without dead ends: 66 [2020-08-22 06:23:39,517 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 [2020-08-22 06:23:39,517 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-08-22 06:23:39,525 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2020-08-22 06:23:39,525 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-08-22 06:23:39,526 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 68 transitions. [2020-08-22 06:23:39,526 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 68 transitions. Word has length 58 [2020-08-22 06:23:39,526 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:23:39,526 INFO L479 AbstractCegarLoop]: Abstraction has 65 states and 68 transitions. [2020-08-22 06:23:39,527 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-22 06:23:39,527 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 68 transitions. [2020-08-22 06:23:39,527 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2020-08-22 06:23:39,527 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:23:39,528 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] [2020-08-22 06:23:39,528 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-22 06:23:39,528 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:23:39,528 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:23:39,528 INFO L82 PathProgramCache]: Analyzing trace with hash -626263574, now seen corresponding path program 9 times [2020-08-22 06:23:39,528 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:23:39,529 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1755856000] [2020-08-22 06:23:39,529 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:23:39,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:39,594 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:23:39,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:39,605 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-22 06:23:39,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:40,554 INFO L134 CoverageAnalysis]: Checked inductivity of 294 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-22 06:23:40,554 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1755856000] [2020-08-22 06:23:40,555 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:23:40,555 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-22 06:23:40,555 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [999854656] [2020-08-22 06:23:40,555 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-22 06:23:40,555 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:23:40,556 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-22 06:23:40,556 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=196, Invalid=310, Unknown=0, NotChecked=0, Total=506 [2020-08-22 06:23:40,556 INFO L87 Difference]: Start difference. First operand 65 states and 68 transitions. Second operand 23 states. [2020-08-22 06:23:40,871 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:23:40,872 INFO L93 Difference]: Finished difference Result 90 states and 96 transitions. [2020-08-22 06:23:40,872 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-22 06:23:40,872 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 60 [2020-08-22 06:23:40,873 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:23:40,873 INFO L225 Difference]: With dead ends: 90 [2020-08-22 06:23:40,873 INFO L226 Difference]: Without dead ends: 68 [2020-08-22 06:23:40,874 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=244, Invalid=406, Unknown=0, NotChecked=0, Total=650 [2020-08-22 06:23:40,874 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-08-22 06:23:40,878 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 67. [2020-08-22 06:23:40,878 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-08-22 06:23:40,879 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 70 transitions. [2020-08-22 06:23:40,879 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 70 transitions. Word has length 60 [2020-08-22 06:23:40,879 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:23:40,879 INFO L479 AbstractCegarLoop]: Abstraction has 67 states and 70 transitions. [2020-08-22 06:23:40,879 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-22 06:23:40,880 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 70 transitions. [2020-08-22 06:23:40,880 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2020-08-22 06:23:40,880 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:23:40,880 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] [2020-08-22 06:23:40,881 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-22 06:23:40,881 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:23:40,881 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:23:40,881 INFO L82 PathProgramCache]: Analyzing trace with hash 1912880044, now seen corresponding path program 10 times [2020-08-22 06:23:40,881 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:23:40,881 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1153162780] [2020-08-22 06:23:40,882 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:23:40,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:40,952 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:23:40,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:40,965 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-22 06:23:40,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:41,845 INFO L134 CoverageAnalysis]: Checked inductivity of 329 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-22 06:23:41,847 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1153162780] [2020-08-22 06:23:41,847 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:23:41,847 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-22 06:23:41,847 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [644130789] [2020-08-22 06:23:41,847 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-22 06:23:41,848 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:23:41,848 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-22 06:23:41,848 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=216, Invalid=336, Unknown=0, NotChecked=0, Total=552 [2020-08-22 06:23:41,848 INFO L87 Difference]: Start difference. First operand 67 states and 70 transitions. Second operand 24 states. [2020-08-22 06:23:42,130 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:23:42,131 INFO L93 Difference]: Finished difference Result 92 states and 98 transitions. [2020-08-22 06:23:42,131 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-22 06:23:42,131 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 62 [2020-08-22 06:23:42,132 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:23:42,133 INFO L225 Difference]: With dead ends: 92 [2020-08-22 06:23:42,133 INFO L226 Difference]: Without dead ends: 70 [2020-08-22 06:23:42,134 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=266, Invalid=436, Unknown=0, NotChecked=0, Total=702 [2020-08-22 06:23:42,135 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-08-22 06:23:42,138 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 69. [2020-08-22 06:23:42,138 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2020-08-22 06:23:42,139 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 72 transitions. [2020-08-22 06:23:42,139 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 72 transitions. Word has length 62 [2020-08-22 06:23:42,139 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:23:42,139 INFO L479 AbstractCegarLoop]: Abstraction has 69 states and 72 transitions. [2020-08-22 06:23:42,139 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-22 06:23:42,140 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 72 transitions. [2020-08-22 06:23:42,140 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2020-08-22 06:23:42,140 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:23:42,140 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] [2020-08-22 06:23:42,141 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-22 06:23:42,141 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:23:42,141 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:23:42,141 INFO L82 PathProgramCache]: Analyzing trace with hash -1806494482, now seen corresponding path program 11 times [2020-08-22 06:23:42,141 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:23:42,142 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1582848202] [2020-08-22 06:23:42,142 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:23:42,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:42,185 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:23:42,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:42,196 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-22 06:23:42,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:43,142 INFO L134 CoverageAnalysis]: Checked inductivity of 366 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-22 06:23:43,142 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1582848202] [2020-08-22 06:23:43,142 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:23:43,142 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-22 06:23:43,143 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [5134267] [2020-08-22 06:23:43,143 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-22 06:23:43,143 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:23:43,143 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-22 06:23:43,144 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=237, Invalid=363, Unknown=0, NotChecked=0, Total=600 [2020-08-22 06:23:43,144 INFO L87 Difference]: Start difference. First operand 69 states and 72 transitions. Second operand 25 states. [2020-08-22 06:23:43,462 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:23:43,463 INFO L93 Difference]: Finished difference Result 94 states and 100 transitions. [2020-08-22 06:23:43,463 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-22 06:23:43,463 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 64 [2020-08-22 06:23:43,463 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:23:43,464 INFO L225 Difference]: With dead ends: 94 [2020-08-22 06:23:43,464 INFO L226 Difference]: Without dead ends: 72 [2020-08-22 06:23:43,465 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=289, Invalid=467, Unknown=0, NotChecked=0, Total=756 [2020-08-22 06:23:43,465 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-08-22 06:23:43,469 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 71. [2020-08-22 06:23:43,469 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-08-22 06:23:43,470 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 74 transitions. [2020-08-22 06:23:43,470 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 74 transitions. Word has length 64 [2020-08-22 06:23:43,470 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:23:43,470 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 74 transitions. [2020-08-22 06:23:43,470 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-22 06:23:43,471 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 74 transitions. [2020-08-22 06:23:43,471 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2020-08-22 06:23:43,471 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:23:43,471 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] [2020-08-22 06:23:43,473 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-22 06:23:43,475 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:23:43,475 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:23:43,476 INFO L82 PathProgramCache]: Analyzing trace with hash 1582343600, now seen corresponding path program 12 times [2020-08-22 06:23:43,476 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:23:43,476 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1889695378] [2020-08-22 06:23:43,476 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:23:43,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:43,525 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:23:43,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:43,538 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-22 06:23:43,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:44,640 INFO L134 CoverageAnalysis]: Checked inductivity of 405 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-22 06:23:44,640 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1889695378] [2020-08-22 06:23:44,640 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:23:44,640 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-22 06:23:44,640 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1611391610] [2020-08-22 06:23:44,641 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-22 06:23:44,641 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:23:44,641 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-22 06:23:44,641 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=259, Invalid=391, Unknown=0, NotChecked=0, Total=650 [2020-08-22 06:23:44,641 INFO L87 Difference]: Start difference. First operand 71 states and 74 transitions. Second operand 26 states. [2020-08-22 06:23:45,013 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:23:45,014 INFO L93 Difference]: Finished difference Result 96 states and 102 transitions. [2020-08-22 06:23:45,014 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-22 06:23:45,014 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 66 [2020-08-22 06:23:45,015 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:23:45,016 INFO L225 Difference]: With dead ends: 96 [2020-08-22 06:23:45,016 INFO L226 Difference]: Without dead ends: 74 [2020-08-22 06:23:45,017 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=313, Invalid=499, Unknown=0, NotChecked=0, Total=812 [2020-08-22 06:23:45,017 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2020-08-22 06:23:45,021 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 73. [2020-08-22 06:23:45,021 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-08-22 06:23:45,022 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 76 transitions. [2020-08-22 06:23:45,022 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 76 transitions. Word has length 66 [2020-08-22 06:23:45,022 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:23:45,022 INFO L479 AbstractCegarLoop]: Abstraction has 73 states and 76 transitions. [2020-08-22 06:23:45,022 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-22 06:23:45,022 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 76 transitions. [2020-08-22 06:23:45,023 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-08-22 06:23:45,023 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:23:45,023 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] [2020-08-22 06:23:45,023 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-22 06:23:45,023 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:23:45,024 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:23:45,024 INFO L82 PathProgramCache]: Analyzing trace with hash -1624437262, now seen corresponding path program 13 times [2020-08-22 06:23:45,024 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:23:45,024 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1124137071] [2020-08-22 06:23:45,024 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:23:45,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:45,069 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:23:45,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:45,078 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-22 06:23:45,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:46,165 INFO L134 CoverageAnalysis]: Checked inductivity of 446 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-22 06:23:46,165 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1124137071] [2020-08-22 06:23:46,166 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:23:46,166 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-22 06:23:46,166 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [35241332] [2020-08-22 06:23:46,166 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-22 06:23:46,166 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:23:46,167 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-22 06:23:46,167 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=282, Invalid=420, Unknown=0, NotChecked=0, Total=702 [2020-08-22 06:23:46,167 INFO L87 Difference]: Start difference. First operand 73 states and 76 transitions. Second operand 27 states. [2020-08-22 06:23:46,409 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:23:46,409 INFO L93 Difference]: Finished difference Result 98 states and 104 transitions. [2020-08-22 06:23:46,409 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-22 06:23:46,409 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 68 [2020-08-22 06:23:46,410 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:23:46,410 INFO L225 Difference]: With dead ends: 98 [2020-08-22 06:23:46,410 INFO L226 Difference]: Without dead ends: 76 [2020-08-22 06:23:46,411 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=338, Invalid=532, Unknown=0, NotChecked=0, Total=870 [2020-08-22 06:23:46,411 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-08-22 06:23:46,415 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 75. [2020-08-22 06:23:46,415 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2020-08-22 06:23:46,415 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 78 transitions. [2020-08-22 06:23:46,416 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 78 transitions. Word has length 68 [2020-08-22 06:23:46,416 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:23:46,416 INFO L479 AbstractCegarLoop]: Abstraction has 75 states and 78 transitions. [2020-08-22 06:23:46,416 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-22 06:23:46,416 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 78 transitions. [2020-08-22 06:23:46,417 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2020-08-22 06:23:46,417 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:23:46,417 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] [2020-08-22 06:23:46,417 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-22 06:23:46,417 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:23:46,417 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:23:46,418 INFO L82 PathProgramCache]: Analyzing trace with hash 445672884, now seen corresponding path program 14 times [2020-08-22 06:23:46,418 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:23:46,418 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1110200350] [2020-08-22 06:23:46,418 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:23:46,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:46,470 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:23:46,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:46,480 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-22 06:23:46,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:47,621 INFO L134 CoverageAnalysis]: Checked inductivity of 489 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-22 06:23:47,621 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1110200350] [2020-08-22 06:23:47,621 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:23:47,621 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-22 06:23:47,622 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1948520914] [2020-08-22 06:23:47,622 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-22 06:23:47,622 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:23:47,622 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-22 06:23:47,623 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=306, Invalid=450, Unknown=0, NotChecked=0, Total=756 [2020-08-22 06:23:47,623 INFO L87 Difference]: Start difference. First operand 75 states and 78 transitions. Second operand 28 states. [2020-08-22 06:23:47,970 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:23:47,971 INFO L93 Difference]: Finished difference Result 100 states and 106 transitions. [2020-08-22 06:23:47,971 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-22 06:23:47,971 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 70 [2020-08-22 06:23:47,972 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:23:47,972 INFO L225 Difference]: With dead ends: 100 [2020-08-22 06:23:47,973 INFO L226 Difference]: Without dead ends: 78 [2020-08-22 06:23:47,974 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=364, Invalid=566, Unknown=0, NotChecked=0, Total=930 [2020-08-22 06:23:47,974 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-08-22 06:23:47,977 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 77. [2020-08-22 06:23:47,977 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2020-08-22 06:23:47,978 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 80 transitions. [2020-08-22 06:23:47,978 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 80 transitions. Word has length 70 [2020-08-22 06:23:47,978 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:23:47,978 INFO L479 AbstractCegarLoop]: Abstraction has 77 states and 80 transitions. [2020-08-22 06:23:47,978 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-22 06:23:47,979 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 80 transitions. [2020-08-22 06:23:47,979 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2020-08-22 06:23:47,979 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:23:47,979 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] [2020-08-22 06:23:47,980 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-22 06:23:47,980 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:23:47,980 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:23:47,980 INFO L82 PathProgramCache]: Analyzing trace with hash 1251665142, now seen corresponding path program 15 times [2020-08-22 06:23:47,980 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:23:47,980 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2036291837] [2020-08-22 06:23:47,981 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:23:47,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:48,024 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:23:48,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:48,034 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-22 06:23:48,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:49,225 INFO L134 CoverageAnalysis]: Checked inductivity of 534 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-22 06:23:49,225 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2036291837] [2020-08-22 06:23:49,225 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:23:49,226 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-22 06:23:49,226 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1482931323] [2020-08-22 06:23:49,226 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-22 06:23:49,226 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:23:49,227 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-22 06:23:49,227 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=331, Invalid=481, Unknown=0, NotChecked=0, Total=812 [2020-08-22 06:23:49,228 INFO L87 Difference]: Start difference. First operand 77 states and 80 transitions. Second operand 29 states. [2020-08-22 06:23:49,658 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:23:49,658 INFO L93 Difference]: Finished difference Result 102 states and 108 transitions. [2020-08-22 06:23:49,658 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-22 06:23:49,659 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 72 [2020-08-22 06:23:49,659 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:23:49,660 INFO L225 Difference]: With dead ends: 102 [2020-08-22 06:23:49,660 INFO L226 Difference]: Without dead ends: 80 [2020-08-22 06:23:49,661 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=391, Invalid=601, Unknown=0, NotChecked=0, Total=992 [2020-08-22 06:23:49,661 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-08-22 06:23:49,665 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 79. [2020-08-22 06:23:49,665 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-08-22 06:23:49,666 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 82 transitions. [2020-08-22 06:23:49,666 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 82 transitions. Word has length 72 [2020-08-22 06:23:49,666 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:23:49,666 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 82 transitions. [2020-08-22 06:23:49,666 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-22 06:23:49,666 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 82 transitions. [2020-08-22 06:23:49,667 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2020-08-22 06:23:49,667 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:23:49,667 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] [2020-08-22 06:23:49,667 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-22 06:23:49,668 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:23:49,668 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:23:49,668 INFO L82 PathProgramCache]: Analyzing trace with hash -1578855496, now seen corresponding path program 16 times [2020-08-22 06:23:49,668 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:23:49,668 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1442875418] [2020-08-22 06:23:49,668 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:23:49,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:49,718 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:23:49,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:49,728 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-22 06:23:49,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:50,971 INFO L134 CoverageAnalysis]: Checked inductivity of 581 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-22 06:23:50,971 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1442875418] [2020-08-22 06:23:50,971 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:23:50,971 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-22 06:23:50,972 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1807836445] [2020-08-22 06:23:50,972 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-22 06:23:50,972 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:23:50,972 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-22 06:23:50,973 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=357, Invalid=513, Unknown=0, NotChecked=0, Total=870 [2020-08-22 06:23:50,973 INFO L87 Difference]: Start difference. First operand 79 states and 82 transitions. Second operand 30 states. [2020-08-22 06:23:51,267 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:23:51,268 INFO L93 Difference]: Finished difference Result 104 states and 110 transitions. [2020-08-22 06:23:51,268 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-22 06:23:51,268 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 74 [2020-08-22 06:23:51,269 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:23:51,270 INFO L225 Difference]: With dead ends: 104 [2020-08-22 06:23:51,270 INFO L226 Difference]: Without dead ends: 82 [2020-08-22 06:23:51,271 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=419, Invalid=637, Unknown=0, NotChecked=0, Total=1056 [2020-08-22 06:23:51,271 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-08-22 06:23:51,275 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 81. [2020-08-22 06:23:51,275 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2020-08-22 06:23:51,275 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 84 transitions. [2020-08-22 06:23:51,275 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 84 transitions. Word has length 74 [2020-08-22 06:23:51,276 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:23:51,276 INFO L479 AbstractCegarLoop]: Abstraction has 81 states and 84 transitions. [2020-08-22 06:23:51,276 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-22 06:23:51,276 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 84 transitions. [2020-08-22 06:23:51,276 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2020-08-22 06:23:51,277 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:23:51,277 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] [2020-08-22 06:23:51,277 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-22 06:23:51,277 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:23:51,277 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:23:51,277 INFO L82 PathProgramCache]: Analyzing trace with hash 1300077050, now seen corresponding path program 17 times [2020-08-22 06:23:51,278 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:23:51,278 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [472114530] [2020-08-22 06:23:51,278 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:23:51,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:51,325 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:23:51,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:51,334 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-22 06:23:51,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:52,668 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 625 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-22 06:23:52,669 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [472114530] [2020-08-22 06:23:52,669 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:23:52,669 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-22 06:23:52,669 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1387488902] [2020-08-22 06:23:52,670 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-22 06:23:52,670 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:23:52,670 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-22 06:23:52,671 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=384, Invalid=546, Unknown=0, NotChecked=0, Total=930 [2020-08-22 06:23:52,671 INFO L87 Difference]: Start difference. First operand 81 states and 84 transitions. Second operand 31 states. [2020-08-22 06:23:53,090 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:23:53,090 INFO L93 Difference]: Finished difference Result 106 states and 112 transitions. [2020-08-22 06:23:53,091 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-22 06:23:53,091 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 76 [2020-08-22 06:23:53,091 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:23:53,092 INFO L225 Difference]: With dead ends: 106 [2020-08-22 06:23:53,092 INFO L226 Difference]: Without dead ends: 84 [2020-08-22 06:23:53,093 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=448, Invalid=674, Unknown=0, NotChecked=0, Total=1122 [2020-08-22 06:23:53,093 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2020-08-22 06:23:53,096 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 83. [2020-08-22 06:23:53,097 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2020-08-22 06:23:53,097 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 86 transitions. [2020-08-22 06:23:53,098 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 86 transitions. Word has length 76 [2020-08-22 06:23:53,098 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:23:53,098 INFO L479 AbstractCegarLoop]: Abstraction has 83 states and 86 transitions. [2020-08-22 06:23:53,098 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-22 06:23:53,098 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 86 transitions. [2020-08-22 06:23:53,099 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-08-22 06:23:53,099 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:23:53,099 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] [2020-08-22 06:23:53,099 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-22 06:23:53,099 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:23:53,099 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:23:53,100 INFO L82 PathProgramCache]: Analyzing trace with hash 1995315132, now seen corresponding path program 18 times [2020-08-22 06:23:53,100 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:23:53,100 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1011774415] [2020-08-22 06:23:53,100 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:23:53,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:53,144 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:23:53,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:53,155 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-22 06:23:53,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:54,495 INFO L134 CoverageAnalysis]: Checked inductivity of 681 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-22 06:23:54,496 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1011774415] [2020-08-22 06:23:54,496 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:23:54,496 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-22 06:23:54,496 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1846735572] [2020-08-22 06:23:54,497 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-22 06:23:54,497 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:23:54,497 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-22 06:23:54,497 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=412, Invalid=580, Unknown=0, NotChecked=0, Total=992 [2020-08-22 06:23:54,497 INFO L87 Difference]: Start difference. First operand 83 states and 86 transitions. Second operand 32 states. [2020-08-22 06:23:54,962 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:23:54,962 INFO L93 Difference]: Finished difference Result 108 states and 114 transitions. [2020-08-22 06:23:54,963 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-22 06:23:54,963 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 78 [2020-08-22 06:23:54,963 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:23:54,964 INFO L225 Difference]: With dead ends: 108 [2020-08-22 06:23:54,964 INFO L226 Difference]: Without dead ends: 86 [2020-08-22 06:23:54,965 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 [2020-08-22 06:23:54,966 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2020-08-22 06:23:54,969 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 85. [2020-08-22 06:23:54,969 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2020-08-22 06:23:54,970 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 88 transitions. [2020-08-22 06:23:54,970 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 88 transitions. Word has length 78 [2020-08-22 06:23:54,970 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:23:54,970 INFO L479 AbstractCegarLoop]: Abstraction has 85 states and 88 transitions. [2020-08-22 06:23:54,971 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-22 06:23:54,971 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 88 transitions. [2020-08-22 06:23:54,972 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2020-08-22 06:23:54,972 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:23:54,972 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] [2020-08-22 06:23:54,972 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-22 06:23:54,972 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:23:54,973 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:23:54,973 INFO L82 PathProgramCache]: Analyzing trace with hash 104213758, now seen corresponding path program 19 times [2020-08-22 06:23:54,973 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:23:54,973 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1053103377] [2020-08-22 06:23:54,973 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:23:54,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:55,029 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:23:55,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:55,040 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-22 06:23:55,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:56,505 INFO L134 CoverageAnalysis]: Checked inductivity of 734 backedges. 0 proven. 729 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-22 06:23:56,505 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1053103377] [2020-08-22 06:23:56,505 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:23:56,505 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-22 06:23:56,505 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1688866914] [2020-08-22 06:23:56,506 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-22 06:23:56,506 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:23:56,506 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-22 06:23:56,507 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=441, Invalid=615, Unknown=0, NotChecked=0, Total=1056 [2020-08-22 06:23:56,507 INFO L87 Difference]: Start difference. First operand 85 states and 88 transitions. Second operand 33 states. [2020-08-22 06:23:56,961 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:23:56,961 INFO L93 Difference]: Finished difference Result 110 states and 116 transitions. [2020-08-22 06:23:56,964 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-22 06:23:56,964 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 80 [2020-08-22 06:23:56,965 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:23:56,966 INFO L225 Difference]: With dead ends: 110 [2020-08-22 06:23:56,966 INFO L226 Difference]: Without dead ends: 88 [2020-08-22 06:23:56,967 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=509, Invalid=751, Unknown=0, NotChecked=0, Total=1260 [2020-08-22 06:23:56,967 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-08-22 06:23:56,973 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 87. [2020-08-22 06:23:56,973 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2020-08-22 06:23:56,974 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 90 transitions. [2020-08-22 06:23:56,974 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 90 transitions. Word has length 80 [2020-08-22 06:23:56,974 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:23:56,974 INFO L479 AbstractCegarLoop]: Abstraction has 87 states and 90 transitions. [2020-08-22 06:23:56,974 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-22 06:23:56,975 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 90 transitions. [2020-08-22 06:23:56,976 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2020-08-22 06:23:56,976 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:23:56,976 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] [2020-08-22 06:23:56,976 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-22 06:23:56,976 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:23:56,976 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:23:56,977 INFO L82 PathProgramCache]: Analyzing trace with hash -473040448, now seen corresponding path program 20 times [2020-08-22 06:23:56,977 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:23:56,977 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1682707729] [2020-08-22 06:23:56,977 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:23:57,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:57,052 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:23:57,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:57,062 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-22 06:23:57,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:58,659 INFO L134 CoverageAnalysis]: Checked inductivity of 789 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-22 06:23:58,659 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1682707729] [2020-08-22 06:23:58,659 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:23:58,660 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-22 06:23:58,660 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [432911525] [2020-08-22 06:23:58,660 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-22 06:23:58,660 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:23:58,660 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-22 06:23:58,661 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=471, Invalid=651, Unknown=0, NotChecked=0, Total=1122 [2020-08-22 06:23:58,661 INFO L87 Difference]: Start difference. First operand 87 states and 90 transitions. Second operand 34 states. [2020-08-22 06:23:59,115 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:23:59,115 INFO L93 Difference]: Finished difference Result 112 states and 118 transitions. [2020-08-22 06:23:59,116 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-22 06:23:59,116 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 82 [2020-08-22 06:23:59,116 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:23:59,117 INFO L225 Difference]: With dead ends: 112 [2020-08-22 06:23:59,117 INFO L226 Difference]: Without dead ends: 90 [2020-08-22 06:23:59,118 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=541, Invalid=791, Unknown=0, NotChecked=0, Total=1332 [2020-08-22 06:23:59,119 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2020-08-22 06:23:59,122 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 89. [2020-08-22 06:23:59,123 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2020-08-22 06:23:59,123 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 92 transitions. [2020-08-22 06:23:59,123 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 92 transitions. Word has length 82 [2020-08-22 06:23:59,124 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:23:59,124 INFO L479 AbstractCegarLoop]: Abstraction has 89 states and 92 transitions. [2020-08-22 06:23:59,124 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-22 06:23:59,124 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 92 transitions. [2020-08-22 06:23:59,124 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2020-08-22 06:23:59,124 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:23:59,125 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] [2020-08-22 06:23:59,125 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-22 06:23:59,125 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:23:59,125 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:23:59,125 INFO L82 PathProgramCache]: Analyzing trace with hash -1163551230, now seen corresponding path program 21 times [2020-08-22 06:23:59,126 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:23:59,126 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1049447337] [2020-08-22 06:23:59,126 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:23:59,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:59,180 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:23:59,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:23:59,221 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-22 06:23:59,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:00,910 INFO L134 CoverageAnalysis]: Checked inductivity of 846 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-22 06:24:00,911 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1049447337] [2020-08-22 06:24:00,911 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:24:00,911 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-22 06:24:00,911 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [916894264] [2020-08-22 06:24:00,911 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-22 06:24:00,911 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:24:00,912 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-22 06:24:00,912 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=502, Invalid=688, Unknown=0, NotChecked=0, Total=1190 [2020-08-22 06:24:00,912 INFO L87 Difference]: Start difference. First operand 89 states and 92 transitions. Second operand 35 states. [2020-08-22 06:24:01,395 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:24:01,395 INFO L93 Difference]: Finished difference Result 114 states and 120 transitions. [2020-08-22 06:24:01,395 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-22 06:24:01,396 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 84 [2020-08-22 06:24:01,396 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:24:01,397 INFO L225 Difference]: With dead ends: 114 [2020-08-22 06:24:01,397 INFO L226 Difference]: Without dead ends: 92 [2020-08-22 06:24:01,398 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=574, Invalid=832, Unknown=0, NotChecked=0, Total=1406 [2020-08-22 06:24:01,399 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2020-08-22 06:24:01,404 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 91. [2020-08-22 06:24:01,404 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2020-08-22 06:24:01,404 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 94 transitions. [2020-08-22 06:24:01,405 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 94 transitions. Word has length 84 [2020-08-22 06:24:01,405 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:24:01,405 INFO L479 AbstractCegarLoop]: Abstraction has 91 states and 94 transitions. [2020-08-22 06:24:01,405 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-22 06:24:01,405 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 94 transitions. [2020-08-22 06:24:01,406 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2020-08-22 06:24:01,406 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:24:01,406 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] [2020-08-22 06:24:01,406 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-22 06:24:01,406 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:24:01,406 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:24:01,407 INFO L82 PathProgramCache]: Analyzing trace with hash 975518148, now seen corresponding path program 22 times [2020-08-22 06:24:01,407 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:24:01,407 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1117343056] [2020-08-22 06:24:01,407 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:24:01,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:01,466 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:24:01,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:01,476 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-22 06:24:01,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:03,202 INFO L134 CoverageAnalysis]: Checked inductivity of 905 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-22 06:24:03,203 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1117343056] [2020-08-22 06:24:03,203 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:24:03,203 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-22 06:24:03,204 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [261799097] [2020-08-22 06:24:03,204 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-22 06:24:03,204 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:24:03,204 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-22 06:24:03,205 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=534, Invalid=726, Unknown=0, NotChecked=0, Total=1260 [2020-08-22 06:24:03,205 INFO L87 Difference]: Start difference. First operand 91 states and 94 transitions. Second operand 36 states. [2020-08-22 06:24:03,574 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:24:03,574 INFO L93 Difference]: Finished difference Result 116 states and 122 transitions. [2020-08-22 06:24:03,575 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-22 06:24:03,575 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 86 [2020-08-22 06:24:03,575 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:24:03,576 INFO L225 Difference]: With dead ends: 116 [2020-08-22 06:24:03,576 INFO L226 Difference]: Without dead ends: 94 [2020-08-22 06:24:03,577 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=608, Invalid=874, Unknown=0, NotChecked=0, Total=1482 [2020-08-22 06:24:03,578 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2020-08-22 06:24:03,581 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 93. [2020-08-22 06:24:03,582 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2020-08-22 06:24:03,582 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 96 transitions. [2020-08-22 06:24:03,582 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 96 transitions. Word has length 86 [2020-08-22 06:24:03,583 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:24:03,583 INFO L479 AbstractCegarLoop]: Abstraction has 93 states and 96 transitions. [2020-08-22 06:24:03,583 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-22 06:24:03,583 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 96 transitions. [2020-08-22 06:24:03,583 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2020-08-22 06:24:03,584 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:24:03,584 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] [2020-08-22 06:24:03,584 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-22 06:24:03,584 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:24:03,584 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:24:03,585 INFO L82 PathProgramCache]: Analyzing trace with hash -668144378, now seen corresponding path program 23 times [2020-08-22 06:24:03,585 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:24:03,585 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [510917699] [2020-08-22 06:24:03,585 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:24:03,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:03,644 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:24:03,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:03,656 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-22 06:24:03,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:05,511 INFO L134 CoverageAnalysis]: Checked inductivity of 966 backedges. 0 proven. 961 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-22 06:24:05,511 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [510917699] [2020-08-22 06:24:05,511 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:24:05,511 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-22 06:24:05,512 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2069845764] [2020-08-22 06:24:05,512 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-22 06:24:05,512 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:24:05,513 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-22 06:24:05,513 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=567, Invalid=765, Unknown=0, NotChecked=0, Total=1332 [2020-08-22 06:24:05,514 INFO L87 Difference]: Start difference. First operand 93 states and 96 transitions. Second operand 37 states. [2020-08-22 06:24:06,018 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:24:06,018 INFO L93 Difference]: Finished difference Result 118 states and 124 transitions. [2020-08-22 06:24:06,019 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-22 06:24:06,019 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 88 [2020-08-22 06:24:06,019 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:24:06,020 INFO L225 Difference]: With dead ends: 118 [2020-08-22 06:24:06,020 INFO L226 Difference]: Without dead ends: 96 [2020-08-22 06:24:06,022 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=643, Invalid=917, Unknown=0, NotChecked=0, Total=1560 [2020-08-22 06:24:06,022 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2020-08-22 06:24:06,026 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 95. [2020-08-22 06:24:06,026 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2020-08-22 06:24:06,027 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 98 transitions. [2020-08-22 06:24:06,027 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 98 transitions. Word has length 88 [2020-08-22 06:24:06,027 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:24:06,027 INFO L479 AbstractCegarLoop]: Abstraction has 95 states and 98 transitions. [2020-08-22 06:24:06,027 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-22 06:24:06,028 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 98 transitions. [2020-08-22 06:24:06,028 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2020-08-22 06:24:06,028 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:24:06,028 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] [2020-08-22 06:24:06,029 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-22 06:24:06,029 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:24:06,029 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:24:06,029 INFO L82 PathProgramCache]: Analyzing trace with hash 320133064, now seen corresponding path program 24 times [2020-08-22 06:24:06,029 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:24:06,029 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1050463283] [2020-08-22 06:24:06,030 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:24:06,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:06,099 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:24:06,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:06,110 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-22 06:24:06,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:08,007 INFO L134 CoverageAnalysis]: Checked inductivity of 1029 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-22 06:24:08,007 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1050463283] [2020-08-22 06:24:08,008 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:24:08,008 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-22 06:24:08,008 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [47253873] [2020-08-22 06:24:08,008 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-22 06:24:08,008 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:24:08,009 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-22 06:24:08,009 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=601, Invalid=805, Unknown=0, NotChecked=0, Total=1406 [2020-08-22 06:24:08,009 INFO L87 Difference]: Start difference. First operand 95 states and 98 transitions. Second operand 38 states. [2020-08-22 06:24:08,437 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:24:08,437 INFO L93 Difference]: Finished difference Result 120 states and 126 transitions. [2020-08-22 06:24:08,437 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-22 06:24:08,438 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 90 [2020-08-22 06:24:08,438 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:24:08,439 INFO L225 Difference]: With dead ends: 120 [2020-08-22 06:24:08,439 INFO L226 Difference]: Without dead ends: 98 [2020-08-22 06:24:08,440 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=679, Invalid=961, Unknown=0, NotChecked=0, Total=1640 [2020-08-22 06:24:08,442 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-08-22 06:24:08,446 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 97. [2020-08-22 06:24:08,446 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2020-08-22 06:24:08,447 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 100 transitions. [2020-08-22 06:24:08,447 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 100 transitions. Word has length 90 [2020-08-22 06:24:08,448 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:24:08,448 INFO L479 AbstractCegarLoop]: Abstraction has 97 states and 100 transitions. [2020-08-22 06:24:08,448 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-22 06:24:08,448 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 100 transitions. [2020-08-22 06:24:08,453 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2020-08-22 06:24:08,453 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:24:08,453 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] [2020-08-22 06:24:08,454 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-22 06:24:08,454 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:24:08,454 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:24:08,454 INFO L82 PathProgramCache]: Analyzing trace with hash 866982410, now seen corresponding path program 25 times [2020-08-22 06:24:08,454 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:24:08,455 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [603467576] [2020-08-22 06:24:08,455 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:24:08,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:08,524 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:24:08,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:08,538 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-22 06:24:08,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:10,536 INFO L134 CoverageAnalysis]: Checked inductivity of 1094 backedges. 0 proven. 1089 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-22 06:24:10,537 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [603467576] [2020-08-22 06:24:10,537 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:24:10,537 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-22 06:24:10,537 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1143001589] [2020-08-22 06:24:10,537 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-22 06:24:10,538 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:24:10,538 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-22 06:24:10,538 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=636, Invalid=846, Unknown=0, NotChecked=0, Total=1482 [2020-08-22 06:24:10,538 INFO L87 Difference]: Start difference. First operand 97 states and 100 transitions. Second operand 39 states. [2020-08-22 06:24:10,887 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:24:10,887 INFO L93 Difference]: Finished difference Result 122 states and 128 transitions. [2020-08-22 06:24:10,888 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-22 06:24:10,888 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 92 [2020-08-22 06:24:10,888 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:24:10,889 INFO L225 Difference]: With dead ends: 122 [2020-08-22 06:24:10,889 INFO L226 Difference]: Without dead ends: 100 [2020-08-22 06:24:10,890 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 [2020-08-22 06:24:10,891 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2020-08-22 06:24:10,893 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 99. [2020-08-22 06:24:10,894 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2020-08-22 06:24:10,894 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 102 transitions. [2020-08-22 06:24:10,894 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 102 transitions. Word has length 92 [2020-08-22 06:24:10,895 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:24:10,895 INFO L479 AbstractCegarLoop]: Abstraction has 99 states and 102 transitions. [2020-08-22 06:24:10,895 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-22 06:24:10,895 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 102 transitions. [2020-08-22 06:24:10,896 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2020-08-22 06:24:10,896 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:24:10,896 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] [2020-08-22 06:24:10,896 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-22 06:24:10,896 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:24:10,896 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:24:10,897 INFO L82 PathProgramCache]: Analyzing trace with hash -1891773492, now seen corresponding path program 26 times [2020-08-22 06:24:10,897 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:24:10,897 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1244017132] [2020-08-22 06:24:10,897 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:24:10,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:10,969 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:24:10,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:10,979 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-22 06:24:10,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:13,144 INFO L134 CoverageAnalysis]: Checked inductivity of 1161 backedges. 0 proven. 1156 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-22 06:24:13,145 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1244017132] [2020-08-22 06:24:13,145 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:24:13,145 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-22 06:24:13,145 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [386881811] [2020-08-22 06:24:13,145 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-22 06:24:13,146 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:24:13,146 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-22 06:24:13,146 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=672, Invalid=888, Unknown=0, NotChecked=0, Total=1560 [2020-08-22 06:24:13,146 INFO L87 Difference]: Start difference. First operand 99 states and 102 transitions. Second operand 40 states. [2020-08-22 06:24:13,510 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:24:13,510 INFO L93 Difference]: Finished difference Result 124 states and 130 transitions. [2020-08-22 06:24:13,511 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-22 06:24:13,511 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 94 [2020-08-22 06:24:13,512 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:24:13,512 INFO L225 Difference]: With dead ends: 124 [2020-08-22 06:24:13,513 INFO L226 Difference]: Without dead ends: 102 [2020-08-22 06:24:13,514 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=754, Invalid=1052, Unknown=0, NotChecked=0, Total=1806 [2020-08-22 06:24:13,514 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2020-08-22 06:24:13,518 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 101. [2020-08-22 06:24:13,519 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2020-08-22 06:24:13,519 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 104 transitions. [2020-08-22 06:24:13,519 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 104 transitions. Word has length 94 [2020-08-22 06:24:13,520 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:24:13,520 INFO L479 AbstractCegarLoop]: Abstraction has 101 states and 104 transitions. [2020-08-22 06:24:13,520 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-22 06:24:13,520 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 104 transitions. [2020-08-22 06:24:13,520 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-08-22 06:24:13,520 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:24:13,521 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] [2020-08-22 06:24:13,521 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-22 06:24:13,521 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:24:13,521 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:24:13,521 INFO L82 PathProgramCache]: Analyzing trace with hash 1233593614, now seen corresponding path program 27 times [2020-08-22 06:24:13,521 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:24:13,521 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [729171556] [2020-08-22 06:24:13,521 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:24:13,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:13,587 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:24:13,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:13,600 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-22 06:24:13,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:15,826 INFO L134 CoverageAnalysis]: Checked inductivity of 1230 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-22 06:24:15,826 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [729171556] [2020-08-22 06:24:15,826 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:24:15,826 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-22 06:24:15,826 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [754933820] [2020-08-22 06:24:15,827 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-22 06:24:15,827 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:24:15,827 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-22 06:24:15,828 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=709, Invalid=931, Unknown=0, NotChecked=0, Total=1640 [2020-08-22 06:24:15,828 INFO L87 Difference]: Start difference. First operand 101 states and 104 transitions. Second operand 41 states. [2020-08-22 06:24:16,209 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:24:16,209 INFO L93 Difference]: Finished difference Result 126 states and 132 transitions. [2020-08-22 06:24:16,210 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-22 06:24:16,210 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 96 [2020-08-22 06:24:16,211 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:24:16,211 INFO L225 Difference]: With dead ends: 126 [2020-08-22 06:24:16,212 INFO L226 Difference]: Without dead ends: 104 [2020-08-22 06:24:16,213 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=793, Invalid=1099, Unknown=0, NotChecked=0, Total=1892 [2020-08-22 06:24:16,213 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2020-08-22 06:24:16,217 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 103. [2020-08-22 06:24:16,217 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2020-08-22 06:24:16,217 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 106 transitions. [2020-08-22 06:24:16,218 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 106 transitions. Word has length 96 [2020-08-22 06:24:16,218 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:24:16,218 INFO L479 AbstractCegarLoop]: Abstraction has 103 states and 106 transitions. [2020-08-22 06:24:16,218 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-22 06:24:16,218 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 106 transitions. [2020-08-22 06:24:16,218 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2020-08-22 06:24:16,219 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:24:16,219 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] [2020-08-22 06:24:16,219 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-22 06:24:16,219 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:24:16,219 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:24:16,219 INFO L82 PathProgramCache]: Analyzing trace with hash -1765724720, now seen corresponding path program 28 times [2020-08-22 06:24:16,219 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:24:16,219 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1512459092] [2020-08-22 06:24:16,219 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:24:16,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:16,281 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:24:16,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:16,292 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-22 06:24:16,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:18,599 INFO L134 CoverageAnalysis]: Checked inductivity of 1301 backedges. 0 proven. 1296 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-22 06:24:18,599 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1512459092] [2020-08-22 06:24:18,599 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:24:18,599 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-22 06:24:18,600 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [668336842] [2020-08-22 06:24:18,600 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-22 06:24:18,600 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:24:18,600 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-22 06:24:18,601 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=747, Invalid=975, Unknown=0, NotChecked=0, Total=1722 [2020-08-22 06:24:18,601 INFO L87 Difference]: Start difference. First operand 103 states and 106 transitions. Second operand 42 states. [2020-08-22 06:24:19,055 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:24:19,055 INFO L93 Difference]: Finished difference Result 128 states and 134 transitions. [2020-08-22 06:24:19,056 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-22 06:24:19,056 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 98 [2020-08-22 06:24:19,056 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:24:19,057 INFO L225 Difference]: With dead ends: 128 [2020-08-22 06:24:19,057 INFO L226 Difference]: Without dead ends: 106 [2020-08-22 06:24:19,058 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=833, Invalid=1147, Unknown=0, NotChecked=0, Total=1980 [2020-08-22 06:24:19,058 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2020-08-22 06:24:19,062 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 105. [2020-08-22 06:24:19,062 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2020-08-22 06:24:19,063 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 108 transitions. [2020-08-22 06:24:19,063 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 108 transitions. Word has length 98 [2020-08-22 06:24:19,063 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:24:19,064 INFO L479 AbstractCegarLoop]: Abstraction has 105 states and 108 transitions. [2020-08-22 06:24:19,064 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-22 06:24:19,064 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 108 transitions. [2020-08-22 06:24:19,064 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2020-08-22 06:24:19,065 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:24:19,065 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] [2020-08-22 06:24:19,065 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-22 06:24:19,065 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:24:19,066 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:24:19,066 INFO L82 PathProgramCache]: Analyzing trace with hash 2107379218, now seen corresponding path program 29 times [2020-08-22 06:24:19,066 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:24:19,066 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [972749028] [2020-08-22 06:24:19,066 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:24:19,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:19,133 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:24:19,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:19,144 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-22 06:24:19,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:21,629 INFO L134 CoverageAnalysis]: Checked inductivity of 1374 backedges. 0 proven. 1369 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-22 06:24:21,629 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [972749028] [2020-08-22 06:24:21,629 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:24:21,629 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-22 06:24:21,629 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1503733382] [2020-08-22 06:24:21,630 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-22 06:24:21,630 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:24:21,630 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-22 06:24:21,631 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=786, Invalid=1020, Unknown=0, NotChecked=0, Total=1806 [2020-08-22 06:24:21,631 INFO L87 Difference]: Start difference. First operand 105 states and 108 transitions. Second operand 43 states. [2020-08-22 06:24:22,240 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:24:22,241 INFO L93 Difference]: Finished difference Result 130 states and 136 transitions. [2020-08-22 06:24:22,241 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-08-22 06:24:22,241 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 100 [2020-08-22 06:24:22,242 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:24:22,243 INFO L225 Difference]: With dead ends: 130 [2020-08-22 06:24:22,243 INFO L226 Difference]: Without dead ends: 108 [2020-08-22 06:24:22,244 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=874, Invalid=1196, Unknown=0, NotChecked=0, Total=2070 [2020-08-22 06:24:22,244 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-08-22 06:24:22,248 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 107. [2020-08-22 06:24:22,248 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2020-08-22 06:24:22,249 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 110 transitions. [2020-08-22 06:24:22,249 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 110 transitions. Word has length 100 [2020-08-22 06:24:22,249 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:24:22,249 INFO L479 AbstractCegarLoop]: Abstraction has 107 states and 110 transitions. [2020-08-22 06:24:22,249 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-22 06:24:22,250 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 110 transitions. [2020-08-22 06:24:22,250 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2020-08-22 06:24:22,250 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:24:22,250 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] [2020-08-22 06:24:22,251 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-08-22 06:24:22,251 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:24:22,251 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:24:22,251 INFO L82 PathProgramCache]: Analyzing trace with hash 423618004, now seen corresponding path program 30 times [2020-08-22 06:24:22,251 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:24:22,251 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [52644779] [2020-08-22 06:24:22,251 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:24:22,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:22,317 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:24:22,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:22,329 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-22 06:24:22,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat