/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=SHALLOWEST --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 [2020-08-21 19:51:58,898 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 19:51:58,901 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 19:51:58,925 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-08-21 19:51:58,959 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 19:51:58,960 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 19:51:58,961 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 19:51:58,961 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-21 19:51:59,006 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 19:51:59,007 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 19:51:59,012 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 19:51:59,013 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 19:51:59,013 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 19:51:59,013 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 19:51:59,013 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 19:51:59,014 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 19:51:59,014 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 19:51:59,014 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 19:51:59,014 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 19:51:59,014 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 19:51:59,015 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 19:51:59,015 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 19:51:59,015 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 19:51:59,015 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 19:51:59,015 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 19:51:59,016 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 19:51:59,016 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 19:51:59,016 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 19:51:59,016 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 19:51:59,016 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 19:51:59,017 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 19:51:59,020 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 19:51:59,020 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 19:51:59,020 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 19:51:59,020 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 19:51:59,021 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 19:51:59,021 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 19:51:59,021 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=SHALLOWEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SHALLOWEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SHALLOWEST;log-additional-information=true; [2020-08-21 19:51:59,364 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 19:51:59,383 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 19:51:59,387 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 19:51:59,389 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 19:51:59,389 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 19:51:59,390 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-industry-pattern/array_of_struct_ptr_flag_init.i [2020-08-21 19:51:59,454 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/e17a586bd/b6d06893383c45fd8932b2ca76ea94aa/FLAG26f7e5491 [2020-08-21 19:51:59,943 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 19:51:59,944 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/array-industry-pattern/array_of_struct_ptr_flag_init.i [2020-08-21 19:51:59,950 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/e17a586bd/b6d06893383c45fd8932b2ca76ea94aa/FLAG26f7e5491 [2020-08-21 19:52:00,280 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/e17a586bd/b6d06893383c45fd8932b2ca76ea94aa [2020-08-21 19:52:00,289 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 19:52:00,291 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 19:52:00,293 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 19:52:00,293 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 19:52:00,296 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 19:52:00,298 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 07:52:00" (1/1) ... [2020-08-21 19:52:00,301 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5b6d277a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:52:00, skipping insertion in model container [2020-08-21 19:52:00,301 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 07:52:00" (1/1) ... [2020-08-21 19:52:00,309 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 19:52:00,326 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 19:52:00,500 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 19:52:00,507 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 19:52:00,528 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 19:52:00,543 INFO L208 MainTranslator]: Completed translation [2020-08-21 19:52:00,544 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:52:00 WrapperNode [2020-08-21 19:52:00,544 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 19:52:00,545 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 19:52:00,545 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 19:52:00,545 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 19:52:00,630 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:52:00" (1/1) ... [2020-08-21 19:52:00,630 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:52:00" (1/1) ... [2020-08-21 19:52:00,638 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:52:00" (1/1) ... [2020-08-21 19:52:00,639 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:52:00" (1/1) ... [2020-08-21 19:52:00,646 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:52:00" (1/1) ... [2020-08-21 19:52:00,651 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:52:00" (1/1) ... [2020-08-21 19:52:00,652 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:52:00" (1/1) ... [2020-08-21 19:52:00,654 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 19:52:00,655 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 19:52:00,655 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 19:52:00,655 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 19:52:00,656 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:52:00" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 19:52:00,712 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 19:52:00,713 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 19:52:00,713 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-21 19:52:00,714 INFO L138 BoogieDeclarations]: Found implementation of procedure init [2020-08-21 19:52:00,714 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 19:52:00,714 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2020-08-21 19:52:00,715 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 19:52:00,716 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-21 19:52:00,716 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-08-21 19:52:00,717 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-08-21 19:52:00,717 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-08-21 19:52:00,718 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 19:52:00,718 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-21 19:52:00,718 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-08-21 19:52:00,718 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-21 19:52:00,720 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 19:52:00,721 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 19:52:01,038 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 19:52:01,039 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-08-21 19:52:01,043 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 07:52:01 BoogieIcfgContainer [2020-08-21 19:52:01,043 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 19:52:01,053 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 19:52:01,053 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 19:52:01,061 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 19:52:01,061 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 07:52:00" (1/3) ... [2020-08-21 19:52:01,062 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@42566231 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 07:52:01, skipping insertion in model container [2020-08-21 19:52:01,063 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:52:00" (2/3) ... [2020-08-21 19:52:01,063 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@42566231 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 07:52:01, skipping insertion in model container [2020-08-21 19:52:01,063 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 07:52:01" (3/3) ... [2020-08-21 19:52:01,065 INFO L109 eAbstractionObserver]: Analyzing ICFG array_of_struct_ptr_flag_init.i [2020-08-21 19:52:01,076 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 19:52:01,084 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 19:52:01,098 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 19:52:01,125 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 19:52:01,125 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 19:52:01,125 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 19:52:01,125 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 19:52:01,126 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 19:52:01,126 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 19:52:01,126 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 19:52:01,126 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 19:52:01,142 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-08-21 19:52:01,147 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-21 19:52:01,148 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:52:01,149 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:52:01,149 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:52:01,154 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:52:01,154 INFO L82 PathProgramCache]: Analyzing trace with hash -850547107, now seen corresponding path program 1 times [2020-08-21 19:52:01,162 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:52:01,163 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [492237677] [2020-08-21 19:52:01,163 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:52:01,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:01,345 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:52:01,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:01,372 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 19:52:01,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:01,384 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:52:01,385 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [492237677] [2020-08-21 19:52:01,387 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 19:52:01,388 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-21 19:52:01,389 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1978127625] [2020-08-21 19:52:01,394 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 19:52:01,395 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:52:01,407 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 19:52:01,408 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 19:52:01,410 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 4 states. [2020-08-21 19:52:01,567 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:52:01,568 INFO L93 Difference]: Finished difference Result 59 states and 76 transitions. [2020-08-21 19:52:01,568 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 19:52:01,570 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 20 [2020-08-21 19:52:01,571 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:52:01,599 INFO L225 Difference]: With dead ends: 59 [2020-08-21 19:52:01,600 INFO L226 Difference]: Without dead ends: 31 [2020-08-21 19:52:01,604 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-21 19:52:01,628 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-21 19:52:01,658 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 28. [2020-08-21 19:52:01,659 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-21 19:52:01,663 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 32 transitions. [2020-08-21 19:52:01,665 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 32 transitions. Word has length 20 [2020-08-21 19:52:01,665 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:52:01,665 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 32 transitions. [2020-08-21 19:52:01,665 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 19:52:01,666 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 32 transitions. [2020-08-21 19:52:01,667 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-21 19:52:01,667 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:52:01,667 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:52:01,667 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 19:52:01,668 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:52:01,668 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:52:01,668 INFO L82 PathProgramCache]: Analyzing trace with hash 1453375688, now seen corresponding path program 1 times [2020-08-21 19:52:01,668 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:52:01,669 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2138500906] [2020-08-21 19:52:01,669 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:52:01,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:01,761 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:52:01,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:01,799 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 19:52:01,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:01,892 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:52:01,892 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2138500906] [2020-08-21 19:52:01,892 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 19:52:01,893 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-08-21 19:52:01,893 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1868292895] [2020-08-21 19:52:01,894 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 19:52:01,895 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:52:01,895 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 19:52:01,896 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-08-21 19:52:01,896 INFO L87 Difference]: Start difference. First operand 28 states and 32 transitions. Second operand 6 states. [2020-08-21 19:52:02,095 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:52:02,096 INFO L93 Difference]: Finished difference Result 48 states and 56 transitions. [2020-08-21 19:52:02,096 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 19:52:02,096 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2020-08-21 19:52:02,097 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:52:02,098 INFO L225 Difference]: With dead ends: 48 [2020-08-21 19:52:02,098 INFO L226 Difference]: Without dead ends: 30 [2020-08-21 19:52:02,100 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2020-08-21 19:52:02,101 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-21 19:52:02,107 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2020-08-21 19:52:02,107 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-21 19:52:02,108 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2020-08-21 19:52:02,109 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 20 [2020-08-21 19:52:02,109 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:52:02,109 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2020-08-21 19:52:02,109 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 19:52:02,110 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2020-08-21 19:52:02,110 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-21 19:52:02,111 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:52:02,111 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:52:02,111 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 19:52:02,112 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:52:02,112 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:52:02,112 INFO L82 PathProgramCache]: Analyzing trace with hash -169907062, now seen corresponding path program 1 times [2020-08-21 19:52:02,112 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:52:02,113 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1702160802] [2020-08-21 19:52:02,123 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:52:02,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:02,174 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:52:02,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:02,190 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 19:52:02,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:02,300 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:52:02,300 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1702160802] [2020-08-21 19:52:02,300 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:52:02,302 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 19:52:02,302 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1143217458] [2020-08-21 19:52:02,302 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 19:52:02,303 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:52:02,303 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 19:52:02,303 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-08-21 19:52:02,303 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand 7 states. [2020-08-21 19:52:02,531 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:52:02,531 INFO L93 Difference]: Finished difference Result 50 states and 58 transitions. [2020-08-21 19:52:02,532 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 19:52:02,532 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 22 [2020-08-21 19:52:02,532 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:52:02,533 INFO L225 Difference]: With dead ends: 50 [2020-08-21 19:52:02,533 INFO L226 Difference]: Without dead ends: 32 [2020-08-21 19:52:02,535 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2020-08-21 19:52:02,537 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-21 19:52:02,544 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2020-08-21 19:52:02,545 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-21 19:52:02,546 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 35 transitions. [2020-08-21 19:52:02,547 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 35 transitions. Word has length 22 [2020-08-21 19:52:02,547 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:52:02,547 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 35 transitions. [2020-08-21 19:52:02,548 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 19:52:02,548 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 35 transitions. [2020-08-21 19:52:02,550 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-21 19:52:02,550 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:52:02,550 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:52:02,550 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 19:52:02,550 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:52:02,551 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:52:02,551 INFO L82 PathProgramCache]: Analyzing trace with hash -1071501364, now seen corresponding path program 2 times [2020-08-21 19:52:02,551 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:52:02,552 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1601919130] [2020-08-21 19:52:02,552 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:52:02,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:02,616 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:52:02,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:02,630 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 19:52:02,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:02,755 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:52:02,755 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1601919130] [2020-08-21 19:52:02,756 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:52:02,756 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 19:52:02,756 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [644951081] [2020-08-21 19:52:02,757 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 19:52:02,757 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:52:02,757 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 19:52:02,758 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2020-08-21 19:52:02,758 INFO L87 Difference]: Start difference. First operand 31 states and 35 transitions. Second operand 8 states. [2020-08-21 19:52:02,925 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:52:02,925 INFO L93 Difference]: Finished difference Result 52 states and 60 transitions. [2020-08-21 19:52:02,926 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-21 19:52:02,926 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 24 [2020-08-21 19:52:02,926 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:52:02,927 INFO L225 Difference]: With dead ends: 52 [2020-08-21 19:52:02,927 INFO L226 Difference]: Without dead ends: 34 [2020-08-21 19:52:02,928 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2020-08-21 19:52:02,929 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-21 19:52:02,933 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2020-08-21 19:52:02,934 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-21 19:52:02,935 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 37 transitions. [2020-08-21 19:52:02,935 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 37 transitions. Word has length 24 [2020-08-21 19:52:02,935 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:52:02,935 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 37 transitions. [2020-08-21 19:52:02,935 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 19:52:02,936 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 37 transitions. [2020-08-21 19:52:02,937 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-21 19:52:02,937 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:52:02,937 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:52:02,937 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 19:52:02,937 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:52:02,938 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:52:02,938 INFO L82 PathProgramCache]: Analyzing trace with hash 79768206, now seen corresponding path program 3 times [2020-08-21 19:52:02,938 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:52:02,939 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1290468547] [2020-08-21 19:52:02,939 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:52:02,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:03,001 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:52:03,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:03,022 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 19:52:03,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:03,219 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:52:03,219 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1290468547] [2020-08-21 19:52:03,219 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:52:03,220 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 19:52:03,220 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [574015192] [2020-08-21 19:52:03,221 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 19:52:03,221 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:52:03,221 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 19:52:03,222 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-21 19:52:03,222 INFO L87 Difference]: Start difference. First operand 33 states and 37 transitions. Second operand 9 states. [2020-08-21 19:52:03,424 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:52:03,424 INFO L93 Difference]: Finished difference Result 54 states and 62 transitions. [2020-08-21 19:52:03,424 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 19:52:03,425 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-08-21 19:52:03,425 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:52:03,426 INFO L225 Difference]: With dead ends: 54 [2020-08-21 19:52:03,426 INFO L226 Difference]: Without dead ends: 36 [2020-08-21 19:52:03,427 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=41, Invalid=91, Unknown=0, NotChecked=0, Total=132 [2020-08-21 19:52:03,427 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-21 19:52:03,432 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2020-08-21 19:52:03,432 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-21 19:52:03,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2020-08-21 19:52:03,433 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 26 [2020-08-21 19:52:03,434 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:52:03,434 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2020-08-21 19:52:03,434 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 19:52:03,434 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2020-08-21 19:52:03,435 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-21 19:52:03,435 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:52:03,435 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:52:03,436 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 19:52:03,436 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:52:03,436 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:52:03,436 INFO L82 PathProgramCache]: Analyzing trace with hash -1651737392, now seen corresponding path program 4 times [2020-08-21 19:52:03,437 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:52:03,437 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [582055994] [2020-08-21 19:52:03,437 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:52:03,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:03,475 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:52:03,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:03,490 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 19:52:03,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:03,722 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:52:03,722 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [582055994] [2020-08-21 19:52:03,723 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:52:03,723 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-21 19:52:03,723 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1104552907] [2020-08-21 19:52:03,724 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 19:52:03,724 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:52:03,724 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 19:52:03,725 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2020-08-21 19:52:03,725 INFO L87 Difference]: Start difference. First operand 35 states and 39 transitions. Second operand 10 states. [2020-08-21 19:52:03,901 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:52:03,902 INFO L93 Difference]: Finished difference Result 56 states and 64 transitions. [2020-08-21 19:52:03,902 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 19:52:03,902 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 28 [2020-08-21 19:52:03,903 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:52:03,903 INFO L225 Difference]: With dead ends: 56 [2020-08-21 19:52:03,904 INFO L226 Difference]: Without dead ends: 38 [2020-08-21 19:52:03,904 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=49, Invalid=107, Unknown=0, NotChecked=0, Total=156 [2020-08-21 19:52:03,905 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-21 19:52:03,909 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2020-08-21 19:52:03,909 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-21 19:52:03,910 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 41 transitions. [2020-08-21 19:52:03,910 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 41 transitions. Word has length 28 [2020-08-21 19:52:03,911 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:52:03,911 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 41 transitions. [2020-08-21 19:52:03,911 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 19:52:03,911 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 41 transitions. [2020-08-21 19:52:03,912 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-21 19:52:03,912 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:52:03,912 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:52:03,913 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 19:52:03,913 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:52:03,913 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:52:03,913 INFO L82 PathProgramCache]: Analyzing trace with hash 818693778, now seen corresponding path program 5 times [2020-08-21 19:52:03,914 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:52:03,914 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1157669321] [2020-08-21 19:52:03,914 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:52:03,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:03,949 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:52:03,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:03,961 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 19:52:03,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:04,216 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:52:04,217 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1157669321] [2020-08-21 19:52:04,217 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:52:04,217 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-21 19:52:04,217 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [779546362] [2020-08-21 19:52:04,218 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 19:52:04,218 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:52:04,218 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 19:52:04,219 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2020-08-21 19:52:04,219 INFO L87 Difference]: Start difference. First operand 37 states and 41 transitions. Second operand 11 states. [2020-08-21 19:52:04,420 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:52:04,420 INFO L93 Difference]: Finished difference Result 58 states and 66 transitions. [2020-08-21 19:52:04,421 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-21 19:52:04,421 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 30 [2020-08-21 19:52:04,421 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:52:04,422 INFO L225 Difference]: With dead ends: 58 [2020-08-21 19:52:04,422 INFO L226 Difference]: Without dead ends: 40 [2020-08-21 19:52:04,423 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=58, Invalid=124, Unknown=0, NotChecked=0, Total=182 [2020-08-21 19:52:04,424 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-21 19:52:04,431 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2020-08-21 19:52:04,432 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-21 19:52:04,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 43 transitions. [2020-08-21 19:52:04,434 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 43 transitions. Word has length 30 [2020-08-21 19:52:04,437 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:52:04,437 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 43 transitions. [2020-08-21 19:52:04,438 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 19:52:04,438 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 43 transitions. [2020-08-21 19:52:04,441 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-21 19:52:04,442 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:52:04,442 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:52:04,442 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 19:52:04,442 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:52:04,443 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:52:04,443 INFO L82 PathProgramCache]: Analyzing trace with hash -213866540, now seen corresponding path program 6 times [2020-08-21 19:52:04,443 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:52:04,444 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [769897176] [2020-08-21 19:52:04,444 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:52:04,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:04,512 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:52:04,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:04,527 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 19:52:04,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:04,809 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:52:04,809 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [769897176] [2020-08-21 19:52:04,809 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:52:04,809 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-21 19:52:04,810 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [985759367] [2020-08-21 19:52:04,810 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-21 19:52:04,810 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:52:04,811 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-21 19:52:04,811 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=90, Unknown=0, NotChecked=0, Total=132 [2020-08-21 19:52:04,811 INFO L87 Difference]: Start difference. First operand 39 states and 43 transitions. Second operand 12 states. [2020-08-21 19:52:05,012 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:52:05,013 INFO L93 Difference]: Finished difference Result 60 states and 68 transitions. [2020-08-21 19:52:05,013 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-21 19:52:05,013 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 32 [2020-08-21 19:52:05,014 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:52:05,014 INFO L225 Difference]: With dead ends: 60 [2020-08-21 19:52:05,014 INFO L226 Difference]: Without dead ends: 42 [2020-08-21 19:52:05,015 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=68, Invalid=142, Unknown=0, NotChecked=0, Total=210 [2020-08-21 19:52:05,016 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-21 19:52:05,020 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2020-08-21 19:52:05,020 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-21 19:52:05,021 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 45 transitions. [2020-08-21 19:52:05,021 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 45 transitions. Word has length 32 [2020-08-21 19:52:05,022 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:52:05,022 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 45 transitions. [2020-08-21 19:52:05,022 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-21 19:52:05,022 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 45 transitions. [2020-08-21 19:52:05,023 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-21 19:52:05,023 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:52:05,023 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:52:05,023 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-21 19:52:05,024 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:52:05,024 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:52:05,024 INFO L82 PathProgramCache]: Analyzing trace with hash -366886762, now seen corresponding path program 7 times [2020-08-21 19:52:05,024 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:52:05,025 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1785810609] [2020-08-21 19:52:05,025 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:52:05,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:05,060 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:52:05,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:05,078 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 19:52:05,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:05,392 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:52:05,393 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1785810609] [2020-08-21 19:52:05,393 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:52:05,393 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 19:52:05,394 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1138560942] [2020-08-21 19:52:05,394 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 19:52:05,395 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:52:05,395 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 19:52:05,395 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=105, Unknown=0, NotChecked=0, Total=156 [2020-08-21 19:52:05,395 INFO L87 Difference]: Start difference. First operand 41 states and 45 transitions. Second operand 13 states. [2020-08-21 19:52:05,573 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:52:05,574 INFO L93 Difference]: Finished difference Result 62 states and 70 transitions. [2020-08-21 19:52:05,574 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-21 19:52:05,574 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 34 [2020-08-21 19:52:05,575 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:52:05,575 INFO L225 Difference]: With dead ends: 62 [2020-08-21 19:52:05,575 INFO L226 Difference]: Without dead ends: 44 [2020-08-21 19:52:05,576 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=79, Invalid=161, Unknown=0, NotChecked=0, Total=240 [2020-08-21 19:52:05,577 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-21 19:52:05,581 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2020-08-21 19:52:05,581 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-21 19:52:05,582 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 47 transitions. [2020-08-21 19:52:05,582 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 47 transitions. Word has length 34 [2020-08-21 19:52:05,582 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:52:05,582 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 47 transitions. [2020-08-21 19:52:05,582 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 19:52:05,582 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 47 transitions. [2020-08-21 19:52:05,583 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-21 19:52:05,583 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:52:05,584 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:52:05,584 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-21 19:52:05,584 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:52:05,584 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:52:05,584 INFO L82 PathProgramCache]: Analyzing trace with hash -1390432040, now seen corresponding path program 8 times [2020-08-21 19:52:05,584 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:52:05,585 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [329344832] [2020-08-21 19:52:05,585 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:52:05,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:05,616 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:52:05,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:05,627 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 19:52:05,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:05,955 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:52:05,955 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [329344832] [2020-08-21 19:52:05,955 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:52:05,956 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-21 19:52:05,956 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [576833257] [2020-08-21 19:52:05,956 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-21 19:52:05,957 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:52:05,957 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-21 19:52:05,957 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2020-08-21 19:52:05,958 INFO L87 Difference]: Start difference. First operand 43 states and 47 transitions. Second operand 14 states. [2020-08-21 19:52:06,197 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:52:06,198 INFO L93 Difference]: Finished difference Result 64 states and 72 transitions. [2020-08-21 19:52:06,198 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-21 19:52:06,198 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 36 [2020-08-21 19:52:06,199 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:52:06,199 INFO L225 Difference]: With dead ends: 64 [2020-08-21 19:52:06,199 INFO L226 Difference]: Without dead ends: 46 [2020-08-21 19:52:06,200 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=91, Invalid=181, Unknown=0, NotChecked=0, Total=272 [2020-08-21 19:52:06,200 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-21 19:52:06,208 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2020-08-21 19:52:06,208 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-21 19:52:06,209 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 49 transitions. [2020-08-21 19:52:06,209 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 49 transitions. Word has length 36 [2020-08-21 19:52:06,210 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:52:06,211 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 49 transitions. [2020-08-21 19:52:06,211 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-21 19:52:06,211 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 49 transitions. [2020-08-21 19:52:06,212 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-21 19:52:06,212 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:52:06,212 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:52:06,212 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-21 19:52:06,213 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:52:06,213 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:52:06,213 INFO L82 PathProgramCache]: Analyzing trace with hash -1469933414, now seen corresponding path program 9 times [2020-08-21 19:52:06,213 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:52:06,214 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1666160200] [2020-08-21 19:52:06,214 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:52:06,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:06,265 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:52:06,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:06,278 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 19:52:06,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:06,297 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2020-08-21 19:52:06,297 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1666160200] [2020-08-21 19:52:06,297 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 19:52:06,298 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-21 19:52:06,298 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2118262770] [2020-08-21 19:52:06,298 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 19:52:06,299 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:52:06,299 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 19:52:06,299 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-21 19:52:06,299 INFO L87 Difference]: Start difference. First operand 45 states and 49 transitions. Second operand 5 states. [2020-08-21 19:52:06,392 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:52:06,393 INFO L93 Difference]: Finished difference Result 65 states and 74 transitions. [2020-08-21 19:52:06,393 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-21 19:52:06,393 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 38 [2020-08-21 19:52:06,394 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:52:06,395 INFO L225 Difference]: With dead ends: 65 [2020-08-21 19:52:06,396 INFO L226 Difference]: Without dead ends: 53 [2020-08-21 19:52:06,397 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-21 19:52:06,398 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-08-21 19:52:06,416 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 46. [2020-08-21 19:52:06,416 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-21 19:52:06,416 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 50 transitions. [2020-08-21 19:52:06,420 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 50 transitions. Word has length 38 [2020-08-21 19:52:06,420 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:52:06,420 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 50 transitions. [2020-08-21 19:52:06,421 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 19:52:06,421 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 50 transitions. [2020-08-21 19:52:06,421 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-21 19:52:06,421 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:52:06,422 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:52:06,422 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-21 19:52:06,422 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:52:06,422 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:52:06,422 INFO L82 PathProgramCache]: Analyzing trace with hash -1568016950, now seen corresponding path program 1 times [2020-08-21 19:52:06,423 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:52:06,423 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [83182695] [2020-08-21 19:52:06,423 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:52:06,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:06,472 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:52:06,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:06,485 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 19:52:06,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:06,499 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2020-08-21 19:52:06,499 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [83182695] [2020-08-21 19:52:06,500 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:52:06,500 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-21 19:52:06,500 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1436496444] [2020-08-21 19:52:06,500 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 19:52:06,501 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:52:06,501 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 19:52:06,501 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-08-21 19:52:06,501 INFO L87 Difference]: Start difference. First operand 46 states and 50 transitions. Second operand 6 states. [2020-08-21 19:52:06,601 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:52:06,601 INFO L93 Difference]: Finished difference Result 73 states and 85 transitions. [2020-08-21 19:52:06,601 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 19:52:06,602 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 41 [2020-08-21 19:52:06,602 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:52:06,603 INFO L225 Difference]: With dead ends: 73 [2020-08-21 19:52:06,603 INFO L226 Difference]: Without dead ends: 61 [2020-08-21 19:52:06,604 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-08-21 19:52:06,604 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-08-21 19:52:06,609 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 49. [2020-08-21 19:52:06,609 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-21 19:52:06,610 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 54 transitions. [2020-08-21 19:52:06,610 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 54 transitions. Word has length 41 [2020-08-21 19:52:06,610 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:52:06,610 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 54 transitions. [2020-08-21 19:52:06,610 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 19:52:06,611 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 54 transitions. [2020-08-21 19:52:06,611 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-21 19:52:06,611 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:52:06,611 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:52:06,612 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-21 19:52:06,612 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:52:06,612 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:52:06,612 INFO L82 PathProgramCache]: Analyzing trace with hash 1298090650, now seen corresponding path program 2 times [2020-08-21 19:52:06,612 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:52:06,613 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1376894646] [2020-08-21 19:52:06,613 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:52:06,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:06,651 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:52:06,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:06,664 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 19:52:06,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:06,676 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 83 trivial. 0 not checked. [2020-08-21 19:52:06,677 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1376894646] [2020-08-21 19:52:06,677 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 19:52:06,677 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-21 19:52:06,677 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1484736555] [2020-08-21 19:52:06,678 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 19:52:06,678 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:52:06,678 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 19:52:06,678 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-21 19:52:06,678 INFO L87 Difference]: Start difference. First operand 49 states and 54 transitions. Second operand 5 states. [2020-08-21 19:52:06,749 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:52:06,750 INFO L93 Difference]: Finished difference Result 69 states and 78 transitions. [2020-08-21 19:52:06,750 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-21 19:52:06,750 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 44 [2020-08-21 19:52:06,750 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:52:06,751 INFO L225 Difference]: With dead ends: 69 [2020-08-21 19:52:06,751 INFO L226 Difference]: Without dead ends: 49 [2020-08-21 19:52:06,752 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-21 19:52:06,752 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-21 19:52:06,756 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-21 19:52:06,756 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-21 19:52:06,757 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 52 transitions. [2020-08-21 19:52:06,757 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 52 transitions. Word has length 44 [2020-08-21 19:52:06,757 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:52:06,757 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 52 transitions. [2020-08-21 19:52:06,758 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 19:52:06,758 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 52 transitions. [2020-08-21 19:52:06,758 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-21 19:52:06,758 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:52:06,759 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:52:06,759 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-21 19:52:06,759 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:52:06,759 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:52:06,759 INFO L82 PathProgramCache]: Analyzing trace with hash 318257626, now seen corresponding path program 1 times [2020-08-21 19:52:06,760 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:52:06,760 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1470567684] [2020-08-21 19:52:06,760 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:52:06,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:06,794 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:52:06,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:06,805 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 19:52:06,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:07,197 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 19:52:07,198 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1470567684] [2020-08-21 19:52:07,198 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:52:07,198 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-21 19:52:07,198 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [182004038] [2020-08-21 19:52:07,199 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-21 19:52:07,199 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:52:07,199 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-21 19:52:07,200 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=138, Unknown=0, NotChecked=0, Total=210 [2020-08-21 19:52:07,200 INFO L87 Difference]: Start difference. First operand 49 states and 52 transitions. Second operand 15 states. [2020-08-21 19:52:07,424 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:52:07,424 INFO L93 Difference]: Finished difference Result 74 states and 80 transitions. [2020-08-21 19:52:07,424 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-21 19:52:07,424 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 44 [2020-08-21 19:52:07,425 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:52:07,425 INFO L225 Difference]: With dead ends: 74 [2020-08-21 19:52:07,425 INFO L226 Difference]: Without dead ends: 52 [2020-08-21 19:52:07,426 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=104, Invalid=202, Unknown=0, NotChecked=0, Total=306 [2020-08-21 19:52:07,426 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-21 19:52:07,430 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2020-08-21 19:52:07,431 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-21 19:52:07,431 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 54 transitions. [2020-08-21 19:52:07,432 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 54 transitions. Word has length 44 [2020-08-21 19:52:07,432 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:52:07,432 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 54 transitions. [2020-08-21 19:52:07,432 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-21 19:52:07,432 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 54 transitions. [2020-08-21 19:52:07,433 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-21 19:52:07,433 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:52:07,433 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:52:07,433 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-21 19:52:07,433 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:52:07,434 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:52:07,434 INFO L82 PathProgramCache]: Analyzing trace with hash -935313508, now seen corresponding path program 2 times [2020-08-21 19:52:07,434 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:52:07,434 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2051385567] [2020-08-21 19:52:07,434 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:52:07,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:07,469 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:52:07,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:07,479 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 19:52:07,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:07,933 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 19:52:07,933 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2051385567] [2020-08-21 19:52:07,933 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:52:07,933 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-21 19:52:07,934 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [837709292] [2020-08-21 19:52:07,934 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-21 19:52:07,935 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:52:07,935 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-21 19:52:07,935 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=156, Unknown=0, NotChecked=0, Total=240 [2020-08-21 19:52:07,935 INFO L87 Difference]: Start difference. First operand 51 states and 54 transitions. Second operand 16 states. [2020-08-21 19:52:08,162 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:52:08,162 INFO L93 Difference]: Finished difference Result 76 states and 82 transitions. [2020-08-21 19:52:08,163 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-21 19:52:08,163 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 46 [2020-08-21 19:52:08,163 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:52:08,164 INFO L225 Difference]: With dead ends: 76 [2020-08-21 19:52:08,164 INFO L226 Difference]: Without dead ends: 54 [2020-08-21 19:52:08,165 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=118, Invalid=224, Unknown=0, NotChecked=0, Total=342 [2020-08-21 19:52:08,165 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-21 19:52:08,177 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2020-08-21 19:52:08,177 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-21 19:52:08,178 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 56 transitions. [2020-08-21 19:52:08,179 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 56 transitions. Word has length 46 [2020-08-21 19:52:08,179 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:52:08,179 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 56 transitions. [2020-08-21 19:52:08,179 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-21 19:52:08,179 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 56 transitions. [2020-08-21 19:52:08,180 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-21 19:52:08,180 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:52:08,180 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:52:08,181 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-21 19:52:08,181 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:52:08,182 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:52:08,182 INFO L82 PathProgramCache]: Analyzing trace with hash 1268636894, now seen corresponding path program 3 times [2020-08-21 19:52:08,182 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:52:08,182 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [762464633] [2020-08-21 19:52:08,183 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:52:08,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:08,228 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:52:08,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:08,241 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 19:52:08,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:08,751 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 19:52:08,751 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [762464633] [2020-08-21 19:52:08,753 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:52:08,754 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-21 19:52:08,754 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [556014156] [2020-08-21 19:52:08,755 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-21 19:52:08,755 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:52:08,755 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-21 19:52:08,756 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=175, Unknown=0, NotChecked=0, Total=272 [2020-08-21 19:52:08,756 INFO L87 Difference]: Start difference. First operand 53 states and 56 transitions. Second operand 17 states. [2020-08-21 19:52:09,027 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:52:09,027 INFO L93 Difference]: Finished difference Result 78 states and 84 transitions. [2020-08-21 19:52:09,028 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-21 19:52:09,028 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 48 [2020-08-21 19:52:09,028 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:52:09,029 INFO L225 Difference]: With dead ends: 78 [2020-08-21 19:52:09,029 INFO L226 Difference]: Without dead ends: 56 [2020-08-21 19:52:09,030 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 [2020-08-21 19:52:09,030 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-08-21 19:52:09,038 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2020-08-21 19:52:09,041 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-21 19:52:09,041 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 58 transitions. [2020-08-21 19:52:09,041 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 58 transitions. Word has length 48 [2020-08-21 19:52:09,042 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:52:09,042 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 58 transitions. [2020-08-21 19:52:09,042 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-21 19:52:09,042 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 58 transitions. [2020-08-21 19:52:09,043 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-21 19:52:09,043 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:52:09,043 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:52:09,043 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-21 19:52:09,044 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:52:09,044 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:52:09,044 INFO L82 PathProgramCache]: Analyzing trace with hash 1846096288, now seen corresponding path program 4 times [2020-08-21 19:52:09,044 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:52:09,044 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1790369201] [2020-08-21 19:52:09,045 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:52:09,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:09,114 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:52:09,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:09,127 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 19:52:09,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:09,645 INFO L134 CoverageAnalysis]: Checked inductivity of 149 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 19:52:09,646 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1790369201] [2020-08-21 19:52:09,646 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:52:09,646 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-21 19:52:09,647 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1894241035] [2020-08-21 19:52:09,647 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-21 19:52:09,647 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:52:09,648 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-21 19:52:09,648 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=195, Unknown=0, NotChecked=0, Total=306 [2020-08-21 19:52:09,648 INFO L87 Difference]: Start difference. First operand 55 states and 58 transitions. Second operand 18 states. [2020-08-21 19:52:09,905 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:52:09,905 INFO L93 Difference]: Finished difference Result 80 states and 86 transitions. [2020-08-21 19:52:09,905 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-21 19:52:09,906 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 50 [2020-08-21 19:52:09,906 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:52:09,907 INFO L225 Difference]: With dead ends: 80 [2020-08-21 19:52:09,907 INFO L226 Difference]: Without dead ends: 58 [2020-08-21 19:52:09,908 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=149, Invalid=271, Unknown=0, NotChecked=0, Total=420 [2020-08-21 19:52:09,908 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-21 19:52:09,913 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2020-08-21 19:52:09,913 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-21 19:52:09,914 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 60 transitions. [2020-08-21 19:52:09,914 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 60 transitions. Word has length 50 [2020-08-21 19:52:09,915 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:52:09,915 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 60 transitions. [2020-08-21 19:52:09,915 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-21 19:52:09,915 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 60 transitions. [2020-08-21 19:52:09,915 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-21 19:52:09,916 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:52:09,916 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:52:09,916 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-21 19:52:09,916 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:52:09,916 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:52:09,916 INFO L82 PathProgramCache]: Analyzing trace with hash -1561174558, now seen corresponding path program 5 times [2020-08-21 19:52:09,917 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:52:09,917 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [876036522] [2020-08-21 19:52:09,917 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:52:09,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:09,976 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:52:09,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:09,987 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 19:52:09,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:10,547 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 19:52:10,548 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [876036522] [2020-08-21 19:52:10,548 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:52:10,548 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-21 19:52:10,548 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1355197320] [2020-08-21 19:52:10,549 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-21 19:52:10,549 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:52:10,549 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-21 19:52:10,550 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=216, Unknown=0, NotChecked=0, Total=342 [2020-08-21 19:52:10,550 INFO L87 Difference]: Start difference. First operand 57 states and 60 transitions. Second operand 19 states. [2020-08-21 19:52:10,828 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:52:10,828 INFO L93 Difference]: Finished difference Result 82 states and 88 transitions. [2020-08-21 19:52:10,829 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-21 19:52:10,829 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 52 [2020-08-21 19:52:10,829 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:52:10,830 INFO L225 Difference]: With dead ends: 82 [2020-08-21 19:52:10,830 INFO L226 Difference]: Without dead ends: 60 [2020-08-21 19:52:10,831 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 [2020-08-21 19:52:10,832 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-08-21 19:52:10,838 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 59. [2020-08-21 19:52:10,838 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-08-21 19:52:10,839 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 62 transitions. [2020-08-21 19:52:10,839 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 62 transitions. Word has length 52 [2020-08-21 19:52:10,839 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:52:10,839 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 62 transitions. [2020-08-21 19:52:10,839 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-21 19:52:10,839 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 62 transitions. [2020-08-21 19:52:10,840 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-21 19:52:10,840 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:52:10,840 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:52:10,840 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-21 19:52:10,841 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:52:10,841 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:52:10,841 INFO L82 PathProgramCache]: Analyzing trace with hash 1111589284, now seen corresponding path program 6 times [2020-08-21 19:52:10,843 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:52:10,843 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [226650079] [2020-08-21 19:52:10,843 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:52:10,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:10,886 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:52:10,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:10,896 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 19:52:10,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:11,481 INFO L134 CoverageAnalysis]: Checked inductivity of 201 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 19:52:11,481 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [226650079] [2020-08-21 19:52:11,481 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:52:11,481 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-21 19:52:11,482 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [843557071] [2020-08-21 19:52:11,482 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-21 19:52:11,482 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:52:11,482 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-21 19:52:11,483 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=142, Invalid=238, Unknown=0, NotChecked=0, Total=380 [2020-08-21 19:52:11,483 INFO L87 Difference]: Start difference. First operand 59 states and 62 transitions. Second operand 20 states. [2020-08-21 19:52:11,761 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:52:11,761 INFO L93 Difference]: Finished difference Result 84 states and 90 transitions. [2020-08-21 19:52:11,762 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-21 19:52:11,762 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 54 [2020-08-21 19:52:11,762 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:52:11,763 INFO L225 Difference]: With dead ends: 84 [2020-08-21 19:52:11,763 INFO L226 Difference]: Without dead ends: 62 [2020-08-21 19:52:11,763 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=184, Invalid=322, Unknown=0, NotChecked=0, Total=506 [2020-08-21 19:52:11,764 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-08-21 19:52:11,767 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2020-08-21 19:52:11,767 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-08-21 19:52:11,768 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 64 transitions. [2020-08-21 19:52:11,768 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 64 transitions. Word has length 54 [2020-08-21 19:52:11,768 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:52:11,768 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 64 transitions. [2020-08-21 19:52:11,768 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-21 19:52:11,768 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 64 transitions. [2020-08-21 19:52:11,769 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-21 19:52:11,769 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:52:11,769 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:52:11,770 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-21 19:52:11,770 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:52:11,770 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:52:11,770 INFO L82 PathProgramCache]: Analyzing trace with hash 1247198438, now seen corresponding path program 7 times [2020-08-21 19:52:11,770 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:52:11,771 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1459723053] [2020-08-21 19:52:11,771 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:52:11,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:11,860 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:52:11,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:11,872 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 19:52:11,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:12,570 INFO L134 CoverageAnalysis]: Checked inductivity of 230 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 19:52:12,570 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1459723053] [2020-08-21 19:52:12,571 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:52:12,571 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-21 19:52:12,571 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [452377496] [2020-08-21 19:52:12,573 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-21 19:52:12,573 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:52:12,573 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-21 19:52:12,574 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=159, Invalid=261, Unknown=0, NotChecked=0, Total=420 [2020-08-21 19:52:12,574 INFO L87 Difference]: Start difference. First operand 61 states and 64 transitions. Second operand 21 states. [2020-08-21 19:52:12,787 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:52:12,787 INFO L93 Difference]: Finished difference Result 86 states and 92 transitions. [2020-08-21 19:52:12,788 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-21 19:52:12,788 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 56 [2020-08-21 19:52:12,788 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:52:12,788 INFO L225 Difference]: With dead ends: 86 [2020-08-21 19:52:12,789 INFO L226 Difference]: Without dead ends: 64 [2020-08-21 19:52:12,789 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=203, Invalid=349, Unknown=0, NotChecked=0, Total=552 [2020-08-21 19:52:12,792 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-08-21 19:52:12,798 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2020-08-21 19:52:12,798 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2020-08-21 19:52:12,798 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 66 transitions. [2020-08-21 19:52:12,799 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 66 transitions. Word has length 56 [2020-08-21 19:52:12,799 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:52:12,800 INFO L479 AbstractCegarLoop]: Abstraction has 63 states and 66 transitions. [2020-08-21 19:52:12,800 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-21 19:52:12,800 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 66 transitions. [2020-08-21 19:52:12,800 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-08-21 19:52:12,800 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:52:12,801 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:52:12,801 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-21 19:52:12,802 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:52:12,802 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:52:12,802 INFO L82 PathProgramCache]: Analyzing trace with hash -1576390744, now seen corresponding path program 8 times [2020-08-21 19:52:12,802 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:52:12,802 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1409490768] [2020-08-21 19:52:12,803 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:52:12,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:12,858 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:52:12,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:12,870 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 19:52:12,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:13,599 INFO L134 CoverageAnalysis]: Checked inductivity of 261 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 19:52:13,600 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1409490768] [2020-08-21 19:52:13,600 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:52:13,600 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-21 19:52:13,600 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1771898729] [2020-08-21 19:52:13,601 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-21 19:52:13,601 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:52:13,601 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-21 19:52:13,601 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=177, Invalid=285, Unknown=0, NotChecked=0, Total=462 [2020-08-21 19:52:13,602 INFO L87 Difference]: Start difference. First operand 63 states and 66 transitions. Second operand 22 states. [2020-08-21 19:52:13,943 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:52:13,943 INFO L93 Difference]: Finished difference Result 88 states and 94 transitions. [2020-08-21 19:52:13,944 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-21 19:52:13,944 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 58 [2020-08-21 19:52:13,944 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:52:13,945 INFO L225 Difference]: With dead ends: 88 [2020-08-21 19:52:13,946 INFO L226 Difference]: Without dead ends: 66 [2020-08-21 19:52:13,948 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=223, Invalid=377, Unknown=0, NotChecked=0, Total=600 [2020-08-21 19:52:13,948 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-08-21 19:52:13,953 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2020-08-21 19:52:13,953 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-08-21 19:52:13,954 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 68 transitions. [2020-08-21 19:52:13,954 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 68 transitions. Word has length 58 [2020-08-21 19:52:13,954 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:52:13,954 INFO L479 AbstractCegarLoop]: Abstraction has 65 states and 68 transitions. [2020-08-21 19:52:13,954 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-21 19:52:13,954 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 68 transitions. [2020-08-21 19:52:13,955 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2020-08-21 19:52:13,955 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:52:13,955 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:52:13,955 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-21 19:52:13,956 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:52:13,956 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:52:13,956 INFO L82 PathProgramCache]: Analyzing trace with hash -626263574, now seen corresponding path program 9 times [2020-08-21 19:52:13,956 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:52:13,956 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1958390125] [2020-08-21 19:52:13,957 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:52:13,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:14,008 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:52:14,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:14,019 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 19:52:14,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:14,965 INFO L134 CoverageAnalysis]: Checked inductivity of 294 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 19:52:14,966 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1958390125] [2020-08-21 19:52:14,966 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:52:14,967 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-21 19:52:14,967 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1395909565] [2020-08-21 19:52:14,967 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-21 19:52:14,967 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:52:14,968 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-21 19:52:14,968 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=196, Invalid=310, Unknown=0, NotChecked=0, Total=506 [2020-08-21 19:52:14,968 INFO L87 Difference]: Start difference. First operand 65 states and 68 transitions. Second operand 23 states. [2020-08-21 19:52:15,286 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:52:15,286 INFO L93 Difference]: Finished difference Result 90 states and 96 transitions. [2020-08-21 19:52:15,289 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-21 19:52:15,289 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 60 [2020-08-21 19:52:15,290 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:52:15,290 INFO L225 Difference]: With dead ends: 90 [2020-08-21 19:52:15,291 INFO L226 Difference]: Without dead ends: 68 [2020-08-21 19:52:15,291 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 [2020-08-21 19:52:15,292 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-08-21 19:52:15,295 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 67. [2020-08-21 19:52:15,295 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-08-21 19:52:15,295 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 70 transitions. [2020-08-21 19:52:15,296 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 70 transitions. Word has length 60 [2020-08-21 19:52:15,296 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:52:15,296 INFO L479 AbstractCegarLoop]: Abstraction has 67 states and 70 transitions. [2020-08-21 19:52:15,296 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-21 19:52:15,296 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 70 transitions. [2020-08-21 19:52:15,297 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2020-08-21 19:52:15,297 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:52:15,297 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:52:15,297 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-21 19:52:15,297 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:52:15,297 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:52:15,298 INFO L82 PathProgramCache]: Analyzing trace with hash 1912880044, now seen corresponding path program 10 times [2020-08-21 19:52:15,298 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:52:15,298 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [632499930] [2020-08-21 19:52:15,298 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:52:15,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:15,342 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:52:15,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:15,353 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 19:52:15,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:16,206 INFO L134 CoverageAnalysis]: Checked inductivity of 329 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 19:52:16,207 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [632499930] [2020-08-21 19:52:16,207 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:52:16,207 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-21 19:52:16,207 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1278297637] [2020-08-21 19:52:16,208 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-21 19:52:16,208 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:52:16,208 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-21 19:52:16,209 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=216, Invalid=336, Unknown=0, NotChecked=0, Total=552 [2020-08-21 19:52:16,209 INFO L87 Difference]: Start difference. First operand 67 states and 70 transitions. Second operand 24 states. [2020-08-21 19:52:16,487 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:52:16,487 INFO L93 Difference]: Finished difference Result 92 states and 98 transitions. [2020-08-21 19:52:16,487 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-21 19:52:16,487 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 62 [2020-08-21 19:52:16,488 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:52:16,488 INFO L225 Difference]: With dead ends: 92 [2020-08-21 19:52:16,488 INFO L226 Difference]: Without dead ends: 70 [2020-08-21 19:52:16,489 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=266, Invalid=436, Unknown=0, NotChecked=0, Total=702 [2020-08-21 19:52:16,490 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-08-21 19:52:16,493 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 69. [2020-08-21 19:52:16,493 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2020-08-21 19:52:16,494 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 72 transitions. [2020-08-21 19:52:16,494 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 72 transitions. Word has length 62 [2020-08-21 19:52:16,494 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:52:16,495 INFO L479 AbstractCegarLoop]: Abstraction has 69 states and 72 transitions. [2020-08-21 19:52:16,495 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-21 19:52:16,495 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 72 transitions. [2020-08-21 19:52:16,495 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2020-08-21 19:52:16,495 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:52:16,495 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:52:16,496 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-21 19:52:16,496 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:52:16,496 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:52:16,496 INFO L82 PathProgramCache]: Analyzing trace with hash -1806494482, now seen corresponding path program 11 times [2020-08-21 19:52:16,496 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:52:16,497 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1406289650] [2020-08-21 19:52:16,497 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:52:16,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:16,541 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:52:16,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:16,551 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 19:52:16,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:17,444 INFO L134 CoverageAnalysis]: Checked inductivity of 366 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 19:52:17,444 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1406289650] [2020-08-21 19:52:17,444 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:52:17,444 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-21 19:52:17,445 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [683484217] [2020-08-21 19:52:17,445 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-21 19:52:17,445 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:52:17,445 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-21 19:52:17,446 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=237, Invalid=363, Unknown=0, NotChecked=0, Total=600 [2020-08-21 19:52:17,446 INFO L87 Difference]: Start difference. First operand 69 states and 72 transitions. Second operand 25 states. [2020-08-21 19:52:17,772 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:52:17,772 INFO L93 Difference]: Finished difference Result 94 states and 100 transitions. [2020-08-21 19:52:17,773 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-21 19:52:17,773 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 64 [2020-08-21 19:52:17,773 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:52:17,774 INFO L225 Difference]: With dead ends: 94 [2020-08-21 19:52:17,774 INFO L226 Difference]: Without dead ends: 72 [2020-08-21 19:52:17,775 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 [2020-08-21 19:52:17,775 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-08-21 19:52:17,779 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 71. [2020-08-21 19:52:17,779 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-08-21 19:52:17,780 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 74 transitions. [2020-08-21 19:52:17,780 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 74 transitions. Word has length 64 [2020-08-21 19:52:17,780 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:52:17,780 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 74 transitions. [2020-08-21 19:52:17,780 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-21 19:52:17,780 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 74 transitions. [2020-08-21 19:52:17,781 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2020-08-21 19:52:17,781 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:52:17,781 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:52:17,781 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-21 19:52:17,782 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:52:17,782 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:52:17,782 INFO L82 PathProgramCache]: Analyzing trace with hash 1582343600, now seen corresponding path program 12 times [2020-08-21 19:52:17,782 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:52:17,782 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [475832779] [2020-08-21 19:52:17,783 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:52:17,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:17,828 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:52:17,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:17,838 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 19:52:17,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:18,797 INFO L134 CoverageAnalysis]: Checked inductivity of 405 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 19:52:18,797 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [475832779] [2020-08-21 19:52:18,797 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:52:18,798 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-21 19:52:18,798 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [738191171] [2020-08-21 19:52:18,798 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-21 19:52:18,798 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:52:18,799 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-21 19:52:18,799 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=259, Invalid=391, Unknown=0, NotChecked=0, Total=650 [2020-08-21 19:52:18,799 INFO L87 Difference]: Start difference. First operand 71 states and 74 transitions. Second operand 26 states. [2020-08-21 19:52:19,189 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:52:19,189 INFO L93 Difference]: Finished difference Result 96 states and 102 transitions. [2020-08-21 19:52:19,190 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-21 19:52:19,190 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 66 [2020-08-21 19:52:19,190 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:52:19,190 INFO L225 Difference]: With dead ends: 96 [2020-08-21 19:52:19,191 INFO L226 Difference]: Without dead ends: 74 [2020-08-21 19:52:19,191 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=313, Invalid=499, Unknown=0, NotChecked=0, Total=812 [2020-08-21 19:52:19,192 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2020-08-21 19:52:19,195 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 73. [2020-08-21 19:52:19,195 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-08-21 19:52:19,195 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 76 transitions. [2020-08-21 19:52:19,195 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 76 transitions. Word has length 66 [2020-08-21 19:52:19,196 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:52:19,196 INFO L479 AbstractCegarLoop]: Abstraction has 73 states and 76 transitions. [2020-08-21 19:52:19,196 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-21 19:52:19,196 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 76 transitions. [2020-08-21 19:52:19,197 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-08-21 19:52:19,197 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:52:19,197 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:52:19,197 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-21 19:52:19,197 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:52:19,197 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:52:19,198 INFO L82 PathProgramCache]: Analyzing trace with hash -1624437262, now seen corresponding path program 13 times [2020-08-21 19:52:19,198 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:52:19,198 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [941932355] [2020-08-21 19:52:19,198 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:52:19,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:19,241 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:52:19,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:19,259 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 19:52:19,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:20,591 INFO L134 CoverageAnalysis]: Checked inductivity of 446 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 19:52:20,591 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [941932355] [2020-08-21 19:52:20,592 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:52:20,592 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-21 19:52:20,592 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [260009828] [2020-08-21 19:52:20,593 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-21 19:52:20,594 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:52:20,594 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-21 19:52:20,595 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=282, Invalid=420, Unknown=0, NotChecked=0, Total=702 [2020-08-21 19:52:20,595 INFO L87 Difference]: Start difference. First operand 73 states and 76 transitions. Second operand 27 states. [2020-08-21 19:52:20,810 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:52:20,810 INFO L93 Difference]: Finished difference Result 98 states and 104 transitions. [2020-08-21 19:52:20,810 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-21 19:52:20,810 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 68 [2020-08-21 19:52:20,811 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:52:20,812 INFO L225 Difference]: With dead ends: 98 [2020-08-21 19:52:20,812 INFO L226 Difference]: Without dead ends: 76 [2020-08-21 19:52:20,813 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=338, Invalid=532, Unknown=0, NotChecked=0, Total=870 [2020-08-21 19:52:20,813 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-08-21 19:52:20,817 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 75. [2020-08-21 19:52:20,817 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2020-08-21 19:52:20,818 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 78 transitions. [2020-08-21 19:52:20,818 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 78 transitions. Word has length 68 [2020-08-21 19:52:20,818 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:52:20,818 INFO L479 AbstractCegarLoop]: Abstraction has 75 states and 78 transitions. [2020-08-21 19:52:20,818 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-21 19:52:20,819 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 78 transitions. [2020-08-21 19:52:20,819 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2020-08-21 19:52:20,819 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:52:20,819 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:52:20,820 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-21 19:52:20,820 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:52:20,820 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:52:20,820 INFO L82 PathProgramCache]: Analyzing trace with hash 445672884, now seen corresponding path program 14 times [2020-08-21 19:52:20,820 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:52:20,820 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1717092496] [2020-08-21 19:52:20,821 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:52:20,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:20,875 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:52:20,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:20,886 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 19:52:20,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:22,026 INFO L134 CoverageAnalysis]: Checked inductivity of 489 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 19:52:22,026 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1717092496] [2020-08-21 19:52:22,027 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:52:22,027 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-21 19:52:22,027 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1461491863] [2020-08-21 19:52:22,027 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-21 19:52:22,027 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:52:22,027 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-21 19:52:22,028 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=306, Invalid=450, Unknown=0, NotChecked=0, Total=756 [2020-08-21 19:52:22,028 INFO L87 Difference]: Start difference. First operand 75 states and 78 transitions. Second operand 28 states. [2020-08-21 19:52:22,369 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:52:22,369 INFO L93 Difference]: Finished difference Result 100 states and 106 transitions. [2020-08-21 19:52:22,370 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-21 19:52:22,370 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 70 [2020-08-21 19:52:22,370 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:52:22,372 INFO L225 Difference]: With dead ends: 100 [2020-08-21 19:52:22,372 INFO L226 Difference]: Without dead ends: 78 [2020-08-21 19:52:22,374 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 [2020-08-21 19:52:22,374 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-08-21 19:52:22,381 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 77. [2020-08-21 19:52:22,381 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2020-08-21 19:52:22,382 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 80 transitions. [2020-08-21 19:52:22,382 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 80 transitions. Word has length 70 [2020-08-21 19:52:22,383 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:52:22,383 INFO L479 AbstractCegarLoop]: Abstraction has 77 states and 80 transitions. [2020-08-21 19:52:22,383 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-21 19:52:22,383 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 80 transitions. [2020-08-21 19:52:22,384 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2020-08-21 19:52:22,384 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:52:22,384 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:52:22,384 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-21 19:52:22,384 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:52:22,384 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:52:22,385 INFO L82 PathProgramCache]: Analyzing trace with hash 1251665142, now seen corresponding path program 15 times [2020-08-21 19:52:22,385 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:52:22,385 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [62677290] [2020-08-21 19:52:22,385 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:52:22,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:22,429 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:52:22,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:22,439 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 19:52:22,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:23,594 INFO L134 CoverageAnalysis]: Checked inductivity of 534 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 19:52:23,595 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [62677290] [2020-08-21 19:52:23,595 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:52:23,595 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-21 19:52:23,595 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1628864930] [2020-08-21 19:52:23,596 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-21 19:52:23,596 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:52:23,596 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-21 19:52:23,597 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=331, Invalid=481, Unknown=0, NotChecked=0, Total=812 [2020-08-21 19:52:23,597 INFO L87 Difference]: Start difference. First operand 77 states and 80 transitions. Second operand 29 states. [2020-08-21 19:52:24,021 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:52:24,022 INFO L93 Difference]: Finished difference Result 102 states and 108 transitions. [2020-08-21 19:52:24,022 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-21 19:52:24,023 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 72 [2020-08-21 19:52:24,023 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:52:24,024 INFO L225 Difference]: With dead ends: 102 [2020-08-21 19:52:24,024 INFO L226 Difference]: Without dead ends: 80 [2020-08-21 19:52:24,024 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=391, Invalid=601, Unknown=0, NotChecked=0, Total=992 [2020-08-21 19:52:24,025 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-08-21 19:52:24,028 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 79. [2020-08-21 19:52:24,028 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-08-21 19:52:24,029 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 82 transitions. [2020-08-21 19:52:24,029 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 82 transitions. Word has length 72 [2020-08-21 19:52:24,029 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:52:24,029 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 82 transitions. [2020-08-21 19:52:24,029 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-21 19:52:24,029 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 82 transitions. [2020-08-21 19:52:24,030 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2020-08-21 19:52:24,030 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:52:24,030 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:52:24,030 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-21 19:52:24,031 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:52:24,031 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:52:24,031 INFO L82 PathProgramCache]: Analyzing trace with hash -1578855496, now seen corresponding path program 16 times [2020-08-21 19:52:24,031 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:52:24,031 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2085070168] [2020-08-21 19:52:24,032 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:52:24,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:24,085 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:52:24,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:24,095 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 19:52:24,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:25,304 INFO L134 CoverageAnalysis]: Checked inductivity of 581 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 19:52:25,304 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2085070168] [2020-08-21 19:52:25,305 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:52:25,305 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-21 19:52:25,305 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1474341356] [2020-08-21 19:52:25,305 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-21 19:52:25,306 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:52:25,306 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-21 19:52:25,306 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=357, Invalid=513, Unknown=0, NotChecked=0, Total=870 [2020-08-21 19:52:25,306 INFO L87 Difference]: Start difference. First operand 79 states and 82 transitions. Second operand 30 states. [2020-08-21 19:52:25,612 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:52:25,612 INFO L93 Difference]: Finished difference Result 104 states and 110 transitions. [2020-08-21 19:52:25,613 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-21 19:52:25,613 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 74 [2020-08-21 19:52:25,613 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:52:25,614 INFO L225 Difference]: With dead ends: 104 [2020-08-21 19:52:25,614 INFO L226 Difference]: Without dead ends: 82 [2020-08-21 19:52:25,615 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 [2020-08-21 19:52:25,616 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-08-21 19:52:25,619 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 81. [2020-08-21 19:52:25,619 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2020-08-21 19:52:25,620 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 84 transitions. [2020-08-21 19:52:25,620 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 84 transitions. Word has length 74 [2020-08-21 19:52:25,620 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:52:25,620 INFO L479 AbstractCegarLoop]: Abstraction has 81 states and 84 transitions. [2020-08-21 19:52:25,620 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-21 19:52:25,620 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 84 transitions. [2020-08-21 19:52:25,621 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2020-08-21 19:52:25,621 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:52:25,621 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:52:25,621 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-21 19:52:25,622 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:52:25,622 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:52:25,622 INFO L82 PathProgramCache]: Analyzing trace with hash 1300077050, now seen corresponding path program 17 times [2020-08-21 19:52:25,622 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:52:25,622 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [203493546] [2020-08-21 19:52:25,622 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:52:25,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:25,676 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:52:25,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:25,688 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 19:52:25,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:27,003 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 625 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 19:52:27,004 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [203493546] [2020-08-21 19:52:27,004 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:52:27,004 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-21 19:52:27,004 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1483730417] [2020-08-21 19:52:27,005 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-21 19:52:27,005 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:52:27,005 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-21 19:52:27,006 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=384, Invalid=546, Unknown=0, NotChecked=0, Total=930 [2020-08-21 19:52:27,006 INFO L87 Difference]: Start difference. First operand 81 states and 84 transitions. Second operand 31 states. [2020-08-21 19:52:27,410 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:52:27,410 INFO L93 Difference]: Finished difference Result 106 states and 112 transitions. [2020-08-21 19:52:27,411 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-21 19:52:27,411 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 76 [2020-08-21 19:52:27,411 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:52:27,412 INFO L225 Difference]: With dead ends: 106 [2020-08-21 19:52:27,412 INFO L226 Difference]: Without dead ends: 84 [2020-08-21 19:52:27,413 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 [2020-08-21 19:52:27,414 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2020-08-21 19:52:27,417 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 83. [2020-08-21 19:52:27,417 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2020-08-21 19:52:27,418 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 86 transitions. [2020-08-21 19:52:27,418 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 86 transitions. Word has length 76 [2020-08-21 19:52:27,418 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:52:27,419 INFO L479 AbstractCegarLoop]: Abstraction has 83 states and 86 transitions. [2020-08-21 19:52:27,419 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-21 19:52:27,419 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 86 transitions. [2020-08-21 19:52:27,419 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-08-21 19:52:27,419 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:52:27,419 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:52:27,420 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-21 19:52:27,420 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:52:27,420 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:52:27,420 INFO L82 PathProgramCache]: Analyzing trace with hash 1995315132, now seen corresponding path program 18 times [2020-08-21 19:52:27,420 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:52:27,421 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1926831241] [2020-08-21 19:52:27,421 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:52:27,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:27,471 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:52:27,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:27,482 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 19:52:27,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:28,894 INFO L134 CoverageAnalysis]: Checked inductivity of 681 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 19:52:28,895 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1926831241] [2020-08-21 19:52:28,895 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:52:28,895 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-21 19:52:28,895 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [774690694] [2020-08-21 19:52:28,895 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-21 19:52:28,896 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:52:28,896 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-21 19:52:28,896 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=412, Invalid=580, Unknown=0, NotChecked=0, Total=992 [2020-08-21 19:52:28,896 INFO L87 Difference]: Start difference. First operand 83 states and 86 transitions. Second operand 32 states. [2020-08-21 19:52:29,347 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:52:29,347 INFO L93 Difference]: Finished difference Result 108 states and 114 transitions. [2020-08-21 19:52:29,347 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-21 19:52:29,348 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 78 [2020-08-21 19:52:29,348 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:52:29,349 INFO L225 Difference]: With dead ends: 108 [2020-08-21 19:52:29,349 INFO L226 Difference]: Without dead ends: 86 [2020-08-21 19:52:29,350 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=478, Invalid=712, Unknown=0, NotChecked=0, Total=1190 [2020-08-21 19:52:29,351 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2020-08-21 19:52:29,353 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 85. [2020-08-21 19:52:29,353 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2020-08-21 19:52:29,354 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 88 transitions. [2020-08-21 19:52:29,354 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 88 transitions. Word has length 78 [2020-08-21 19:52:29,354 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:52:29,354 INFO L479 AbstractCegarLoop]: Abstraction has 85 states and 88 transitions. [2020-08-21 19:52:29,355 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-21 19:52:29,355 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 88 transitions. [2020-08-21 19:52:29,355 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2020-08-21 19:52:29,355 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:52:29,355 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:52:29,356 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-21 19:52:29,356 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:52:29,356 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:52:29,356 INFO L82 PathProgramCache]: Analyzing trace with hash 104213758, now seen corresponding path program 19 times [2020-08-21 19:52:29,356 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:52:29,356 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [229430435] [2020-08-21 19:52:29,357 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:52:29,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:29,422 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:52:29,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:29,433 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 19:52:29,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:30,930 INFO L134 CoverageAnalysis]: Checked inductivity of 734 backedges. 0 proven. 729 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 19:52:30,931 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [229430435] [2020-08-21 19:52:30,931 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:52:30,931 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-21 19:52:30,931 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1417212735] [2020-08-21 19:52:30,932 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-21 19:52:30,932 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:52:30,932 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-21 19:52:30,933 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=441, Invalid=615, Unknown=0, NotChecked=0, Total=1056 [2020-08-21 19:52:30,933 INFO L87 Difference]: Start difference. First operand 85 states and 88 transitions. Second operand 33 states. [2020-08-21 19:52:31,389 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:52:31,389 INFO L93 Difference]: Finished difference Result 110 states and 116 transitions. [2020-08-21 19:52:31,390 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-21 19:52:31,390 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 80 [2020-08-21 19:52:31,390 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:52:31,391 INFO L225 Difference]: With dead ends: 110 [2020-08-21 19:52:31,391 INFO L226 Difference]: Without dead ends: 88 [2020-08-21 19:52:31,393 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=509, Invalid=751, Unknown=0, NotChecked=0, Total=1260 [2020-08-21 19:52:31,393 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-08-21 19:52:31,397 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 87. [2020-08-21 19:52:31,397 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2020-08-21 19:52:31,397 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 90 transitions. [2020-08-21 19:52:31,398 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 90 transitions. Word has length 80 [2020-08-21 19:52:31,398 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:52:31,398 INFO L479 AbstractCegarLoop]: Abstraction has 87 states and 90 transitions. [2020-08-21 19:52:31,398 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-21 19:52:31,398 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 90 transitions. [2020-08-21 19:52:31,399 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2020-08-21 19:52:31,399 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:52:31,399 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:52:31,399 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-21 19:52:31,399 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:52:31,400 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:52:31,400 INFO L82 PathProgramCache]: Analyzing trace with hash -473040448, now seen corresponding path program 20 times [2020-08-21 19:52:31,400 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:52:31,400 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2077421676] [2020-08-21 19:52:31,400 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:52:31,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:31,460 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:52:31,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:31,470 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 19:52:31,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:32,992 INFO L134 CoverageAnalysis]: Checked inductivity of 789 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 19:52:32,993 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2077421676] [2020-08-21 19:52:32,993 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:52:32,993 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-21 19:52:32,993 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [464133328] [2020-08-21 19:52:32,993 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-21 19:52:32,993 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:52:32,994 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-21 19:52:32,994 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=471, Invalid=651, Unknown=0, NotChecked=0, Total=1122 [2020-08-21 19:52:32,994 INFO L87 Difference]: Start difference. First operand 87 states and 90 transitions. Second operand 34 states. [2020-08-21 19:52:33,448 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:52:33,448 INFO L93 Difference]: Finished difference Result 112 states and 118 transitions. [2020-08-21 19:52:33,449 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-21 19:52:33,449 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 82 [2020-08-21 19:52:33,449 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:52:33,450 INFO L225 Difference]: With dead ends: 112 [2020-08-21 19:52:33,450 INFO L226 Difference]: Without dead ends: 90 [2020-08-21 19:52:33,452 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=541, Invalid=791, Unknown=0, NotChecked=0, Total=1332 [2020-08-21 19:52:33,452 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2020-08-21 19:52:33,456 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 89. [2020-08-21 19:52:33,456 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2020-08-21 19:52:33,457 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 92 transitions. [2020-08-21 19:52:33,457 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 92 transitions. Word has length 82 [2020-08-21 19:52:33,457 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:52:33,457 INFO L479 AbstractCegarLoop]: Abstraction has 89 states and 92 transitions. [2020-08-21 19:52:33,457 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-21 19:52:33,458 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 92 transitions. [2020-08-21 19:52:33,458 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2020-08-21 19:52:33,458 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:52:33,458 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:52:33,458 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-21 19:52:33,459 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:52:33,459 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:52:33,459 INFO L82 PathProgramCache]: Analyzing trace with hash -1163551230, now seen corresponding path program 21 times [2020-08-21 19:52:33,459 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:52:33,459 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1613952098] [2020-08-21 19:52:33,459 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:52:33,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:33,511 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:52:33,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:33,523 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 19:52:33,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:35,165 INFO L134 CoverageAnalysis]: Checked inductivity of 846 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 19:52:35,165 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1613952098] [2020-08-21 19:52:35,165 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:52:35,166 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-21 19:52:35,166 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1749990335] [2020-08-21 19:52:35,166 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-21 19:52:35,166 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:52:35,166 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-21 19:52:35,167 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=502, Invalid=688, Unknown=0, NotChecked=0, Total=1190 [2020-08-21 19:52:35,167 INFO L87 Difference]: Start difference. First operand 89 states and 92 transitions. Second operand 35 states. [2020-08-21 19:52:35,672 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:52:35,672 INFO L93 Difference]: Finished difference Result 114 states and 120 transitions. [2020-08-21 19:52:35,673 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-21 19:52:35,673 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 84 [2020-08-21 19:52:35,673 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:52:35,674 INFO L225 Difference]: With dead ends: 114 [2020-08-21 19:52:35,674 INFO L226 Difference]: Without dead ends: 92 [2020-08-21 19:52:35,675 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=574, Invalid=832, Unknown=0, NotChecked=0, Total=1406 [2020-08-21 19:52:35,676 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2020-08-21 19:52:35,680 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 91. [2020-08-21 19:52:35,681 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2020-08-21 19:52:35,681 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 94 transitions. [2020-08-21 19:52:35,682 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 94 transitions. Word has length 84 [2020-08-21 19:52:35,682 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:52:35,682 INFO L479 AbstractCegarLoop]: Abstraction has 91 states and 94 transitions. [2020-08-21 19:52:35,682 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-21 19:52:35,682 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 94 transitions. [2020-08-21 19:52:35,683 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2020-08-21 19:52:35,683 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:52:35,683 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:52:35,683 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-21 19:52:35,683 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:52:35,683 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:52:35,684 INFO L82 PathProgramCache]: Analyzing trace with hash 975518148, now seen corresponding path program 22 times [2020-08-21 19:52:35,684 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:52:35,684 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [819149795] [2020-08-21 19:52:35,684 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:52:35,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:35,735 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:52:35,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:35,744 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 19:52:35,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:37,488 INFO L134 CoverageAnalysis]: Checked inductivity of 905 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 19:52:37,489 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [819149795] [2020-08-21 19:52:37,489 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:52:37,489 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-21 19:52:37,489 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [807778463] [2020-08-21 19:52:37,490 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-21 19:52:37,490 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:52:37,490 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-21 19:52:37,490 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=534, Invalid=726, Unknown=0, NotChecked=0, Total=1260 [2020-08-21 19:52:37,491 INFO L87 Difference]: Start difference. First operand 91 states and 94 transitions. Second operand 36 states. [2020-08-21 19:52:37,816 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:52:37,816 INFO L93 Difference]: Finished difference Result 116 states and 122 transitions. [2020-08-21 19:52:37,817 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-21 19:52:37,817 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 86 [2020-08-21 19:52:37,817 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:52:37,818 INFO L225 Difference]: With dead ends: 116 [2020-08-21 19:52:37,819 INFO L226 Difference]: Without dead ends: 94 [2020-08-21 19:52:37,820 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 [2020-08-21 19:52:37,820 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2020-08-21 19:52:37,824 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 93. [2020-08-21 19:52:37,824 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2020-08-21 19:52:37,825 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 96 transitions. [2020-08-21 19:52:37,825 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 96 transitions. Word has length 86 [2020-08-21 19:52:37,825 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:52:37,826 INFO L479 AbstractCegarLoop]: Abstraction has 93 states and 96 transitions. [2020-08-21 19:52:37,826 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-21 19:52:37,826 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 96 transitions. [2020-08-21 19:52:37,826 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2020-08-21 19:52:37,826 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:52:37,826 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:52:37,827 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-21 19:52:37,827 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:52:37,827 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:52:37,827 INFO L82 PathProgramCache]: Analyzing trace with hash -668144378, now seen corresponding path program 23 times [2020-08-21 19:52:37,827 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:52:37,828 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1254070316] [2020-08-21 19:52:37,828 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:52:37,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:37,885 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:52:37,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:37,901 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 19:52:37,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:39,748 INFO L134 CoverageAnalysis]: Checked inductivity of 966 backedges. 0 proven. 961 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 19:52:39,749 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1254070316] [2020-08-21 19:52:39,749 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:52:39,749 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-21 19:52:39,749 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1489061007] [2020-08-21 19:52:39,749 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-21 19:52:39,749 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:52:39,750 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-21 19:52:39,750 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=567, Invalid=765, Unknown=0, NotChecked=0, Total=1332 [2020-08-21 19:52:39,750 INFO L87 Difference]: Start difference. First operand 93 states and 96 transitions. Second operand 37 states. [2020-08-21 19:52:40,263 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:52:40,264 INFO L93 Difference]: Finished difference Result 118 states and 124 transitions. [2020-08-21 19:52:40,264 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-21 19:52:40,264 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 88 [2020-08-21 19:52:40,265 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:52:40,266 INFO L225 Difference]: With dead ends: 118 [2020-08-21 19:52:40,266 INFO L226 Difference]: Without dead ends: 96 [2020-08-21 19:52:40,267 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 [2020-08-21 19:52:40,268 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2020-08-21 19:52:40,272 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 95. [2020-08-21 19:52:40,272 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2020-08-21 19:52:40,273 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 98 transitions. [2020-08-21 19:52:40,273 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 98 transitions. Word has length 88 [2020-08-21 19:52:40,273 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:52:40,273 INFO L479 AbstractCegarLoop]: Abstraction has 95 states and 98 transitions. [2020-08-21 19:52:40,273 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-21 19:52:40,273 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 98 transitions. [2020-08-21 19:52:40,274 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2020-08-21 19:52:40,274 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:52:40,274 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:52:40,274 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-21 19:52:40,274 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:52:40,275 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:52:40,275 INFO L82 PathProgramCache]: Analyzing trace with hash 320133064, now seen corresponding path program 24 times [2020-08-21 19:52:40,275 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:52:40,275 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [319197882] [2020-08-21 19:52:40,275 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:52:40,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:40,344 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:52:40,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:40,355 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 19:52:40,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:42,331 INFO L134 CoverageAnalysis]: Checked inductivity of 1029 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 19:52:42,331 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [319197882] [2020-08-21 19:52:42,331 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:52:42,332 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-21 19:52:42,332 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1491746996] [2020-08-21 19:52:42,332 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-21 19:52:42,332 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:52:42,333 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-21 19:52:42,333 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=601, Invalid=805, Unknown=0, NotChecked=0, Total=1406 [2020-08-21 19:52:42,333 INFO L87 Difference]: Start difference. First operand 95 states and 98 transitions. Second operand 38 states. [2020-08-21 19:52:42,758 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:52:42,758 INFO L93 Difference]: Finished difference Result 120 states and 126 transitions. [2020-08-21 19:52:42,759 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-21 19:52:42,759 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 90 [2020-08-21 19:52:42,759 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:52:42,760 INFO L225 Difference]: With dead ends: 120 [2020-08-21 19:52:42,760 INFO L226 Difference]: Without dead ends: 98 [2020-08-21 19:52:42,761 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 [2020-08-21 19:52:42,762 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-08-21 19:52:42,766 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 97. [2020-08-21 19:52:42,766 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2020-08-21 19:52:42,767 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 100 transitions. [2020-08-21 19:52:42,767 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 100 transitions. Word has length 90 [2020-08-21 19:52:42,767 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:52:42,767 INFO L479 AbstractCegarLoop]: Abstraction has 97 states and 100 transitions. [2020-08-21 19:52:42,767 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-21 19:52:42,768 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 100 transitions. [2020-08-21 19:52:42,768 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2020-08-21 19:52:42,768 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:52:42,769 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:52:42,769 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-21 19:52:42,769 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:52:42,769 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:52:42,769 INFO L82 PathProgramCache]: Analyzing trace with hash 866982410, now seen corresponding path program 25 times [2020-08-21 19:52:42,769 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:52:42,770 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1009808740] [2020-08-21 19:52:42,770 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:52:42,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:42,831 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:52:42,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:42,842 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 19:52:42,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:44,872 INFO L134 CoverageAnalysis]: Checked inductivity of 1094 backedges. 0 proven. 1089 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 19:52:44,873 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1009808740] [2020-08-21 19:52:44,873 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:52:44,873 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-21 19:52:44,873 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1527995278] [2020-08-21 19:52:44,873 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-21 19:52:44,873 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:52:44,874 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-21 19:52:44,874 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=636, Invalid=846, Unknown=0, NotChecked=0, Total=1482 [2020-08-21 19:52:44,875 INFO L87 Difference]: Start difference. First operand 97 states and 100 transitions. Second operand 39 states. [2020-08-21 19:52:45,230 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:52:45,230 INFO L93 Difference]: Finished difference Result 122 states and 128 transitions. [2020-08-21 19:52:45,231 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-21 19:52:45,231 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 92 [2020-08-21 19:52:45,232 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:52:45,232 INFO L225 Difference]: With dead ends: 122 [2020-08-21 19:52:45,232 INFO L226 Difference]: Without dead ends: 100 [2020-08-21 19:52:45,233 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=716, Invalid=1006, Unknown=0, NotChecked=0, Total=1722 [2020-08-21 19:52:45,234 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2020-08-21 19:52:45,236 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 99. [2020-08-21 19:52:45,237 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2020-08-21 19:52:45,237 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 102 transitions. [2020-08-21 19:52:45,237 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 102 transitions. Word has length 92 [2020-08-21 19:52:45,238 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:52:45,238 INFO L479 AbstractCegarLoop]: Abstraction has 99 states and 102 transitions. [2020-08-21 19:52:45,238 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-21 19:52:45,238 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 102 transitions. [2020-08-21 19:52:45,239 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2020-08-21 19:52:45,239 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:52:45,239 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:52:45,239 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-21 19:52:45,239 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:52:45,240 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:52:45,240 INFO L82 PathProgramCache]: Analyzing trace with hash -1891773492, now seen corresponding path program 26 times [2020-08-21 19:52:45,240 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:52:45,240 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [262230039] [2020-08-21 19:52:45,240 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:52:45,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:45,327 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:52:45,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:45,338 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 19:52:45,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:47,448 INFO L134 CoverageAnalysis]: Checked inductivity of 1161 backedges. 0 proven. 1156 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 19:52:47,448 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [262230039] [2020-08-21 19:52:47,449 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:52:47,449 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-21 19:52:47,449 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2106752689] [2020-08-21 19:52:47,449 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-21 19:52:47,449 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:52:47,450 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-21 19:52:47,450 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=672, Invalid=888, Unknown=0, NotChecked=0, Total=1560 [2020-08-21 19:52:47,450 INFO L87 Difference]: Start difference. First operand 99 states and 102 transitions. Second operand 40 states. [2020-08-21 19:52:47,786 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:52:47,786 INFO L93 Difference]: Finished difference Result 124 states and 130 transitions. [2020-08-21 19:52:47,787 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-21 19:52:47,787 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 94 [2020-08-21 19:52:47,787 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:52:47,788 INFO L225 Difference]: With dead ends: 124 [2020-08-21 19:52:47,788 INFO L226 Difference]: Without dead ends: 102 [2020-08-21 19:52:47,789 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 [2020-08-21 19:52:47,789 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2020-08-21 19:52:47,793 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 101. [2020-08-21 19:52:47,793 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2020-08-21 19:52:47,796 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 104 transitions. [2020-08-21 19:52:47,796 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 104 transitions. Word has length 94 [2020-08-21 19:52:47,796 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:52:47,796 INFO L479 AbstractCegarLoop]: Abstraction has 101 states and 104 transitions. [2020-08-21 19:52:47,796 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-21 19:52:47,797 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 104 transitions. [2020-08-21 19:52:47,797 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-08-21 19:52:47,797 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:52:47,797 INFO L422 BasicCegarLoop]: trace histogram [35, 35, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:52:47,797 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-21 19:52:47,798 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:52:47,798 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:52:47,798 INFO L82 PathProgramCache]: Analyzing trace with hash 1233593614, now seen corresponding path program 27 times [2020-08-21 19:52:47,798 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:52:47,798 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [804427919] [2020-08-21 19:52:47,798 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:52:47,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:47,874 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:52:47,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:47,886 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 19:52:47,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:50,150 INFO L134 CoverageAnalysis]: Checked inductivity of 1230 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 19:52:50,151 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [804427919] [2020-08-21 19:52:50,151 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:52:50,151 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-21 19:52:50,151 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1051499102] [2020-08-21 19:52:50,151 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-21 19:52:50,152 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:52:50,152 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-21 19:52:50,153 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=709, Invalid=931, Unknown=0, NotChecked=0, Total=1640 [2020-08-21 19:52:50,153 INFO L87 Difference]: Start difference. First operand 101 states and 104 transitions. Second operand 41 states. [2020-08-21 19:52:50,511 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:52:50,512 INFO L93 Difference]: Finished difference Result 126 states and 132 transitions. [2020-08-21 19:52:50,512 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-21 19:52:50,512 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 96 [2020-08-21 19:52:50,513 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:52:50,513 INFO L225 Difference]: With dead ends: 126 [2020-08-21 19:52:50,514 INFO L226 Difference]: Without dead ends: 104 [2020-08-21 19:52:50,515 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 [2020-08-21 19:52:50,515 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2020-08-21 19:52:50,519 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 103. [2020-08-21 19:52:50,520 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2020-08-21 19:52:50,520 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 106 transitions. [2020-08-21 19:52:50,520 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 106 transitions. Word has length 96 [2020-08-21 19:52:50,521 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:52:50,521 INFO L479 AbstractCegarLoop]: Abstraction has 103 states and 106 transitions. [2020-08-21 19:52:50,521 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-21 19:52:50,521 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 106 transitions. [2020-08-21 19:52:50,522 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2020-08-21 19:52:50,522 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:52:50,522 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:52:50,522 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-21 19:52:50,522 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:52:50,522 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:52:50,522 INFO L82 PathProgramCache]: Analyzing trace with hash -1765724720, now seen corresponding path program 28 times [2020-08-21 19:52:50,523 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:52:50,523 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [345866205] [2020-08-21 19:52:50,523 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:52:50,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:50,591 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:52:50,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:50,605 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 19:52:50,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:52,976 INFO L134 CoverageAnalysis]: Checked inductivity of 1301 backedges. 0 proven. 1296 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 19:52:52,977 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [345866205] [2020-08-21 19:52:52,977 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:52:52,977 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-21 19:52:52,977 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [914348900] [2020-08-21 19:52:52,977 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-21 19:52:52,978 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:52:52,978 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-21 19:52:52,979 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=747, Invalid=975, Unknown=0, NotChecked=0, Total=1722 [2020-08-21 19:52:52,979 INFO L87 Difference]: Start difference. First operand 103 states and 106 transitions. Second operand 42 states. [2020-08-21 19:52:53,437 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:52:53,437 INFO L93 Difference]: Finished difference Result 128 states and 134 transitions. [2020-08-21 19:52:53,438 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-21 19:52:53,438 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 98 [2020-08-21 19:52:53,439 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:52:53,439 INFO L225 Difference]: With dead ends: 128 [2020-08-21 19:52:53,439 INFO L226 Difference]: Without dead ends: 106 [2020-08-21 19:52:53,441 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 [2020-08-21 19:52:53,441 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2020-08-21 19:52:53,445 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 105. [2020-08-21 19:52:53,445 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2020-08-21 19:52:53,446 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 108 transitions. [2020-08-21 19:52:53,446 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 108 transitions. Word has length 98 [2020-08-21 19:52:53,446 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:52:53,446 INFO L479 AbstractCegarLoop]: Abstraction has 105 states and 108 transitions. [2020-08-21 19:52:53,446 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-21 19:52:53,446 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 108 transitions. [2020-08-21 19:52:53,447 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2020-08-21 19:52:53,447 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:52:53,447 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:52:53,448 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-21 19:52:53,448 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:52:53,448 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:52:53,448 INFO L82 PathProgramCache]: Analyzing trace with hash 2107379218, now seen corresponding path program 29 times [2020-08-21 19:52:53,448 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:52:53,448 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1608332057] [2020-08-21 19:52:53,449 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:52:53,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:53,524 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:52:53,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:53,534 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 19:52:53,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:55,974 INFO L134 CoverageAnalysis]: Checked inductivity of 1374 backedges. 0 proven. 1369 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 19:52:55,975 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1608332057] [2020-08-21 19:52:55,975 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:52:55,975 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-21 19:52:55,975 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1193924169] [2020-08-21 19:52:55,976 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-21 19:52:55,976 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:52:55,976 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-21 19:52:55,977 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=786, Invalid=1020, Unknown=0, NotChecked=0, Total=1806 [2020-08-21 19:52:55,977 INFO L87 Difference]: Start difference. First operand 105 states and 108 transitions. Second operand 43 states. [2020-08-21 19:52:56,558 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:52:56,559 INFO L93 Difference]: Finished difference Result 130 states and 136 transitions. [2020-08-21 19:52:56,559 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-08-21 19:52:56,559 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 100 [2020-08-21 19:52:56,560 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:52:56,560 INFO L225 Difference]: With dead ends: 130 [2020-08-21 19:52:56,560 INFO L226 Difference]: Without dead ends: 108 [2020-08-21 19:52:56,561 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 [2020-08-21 19:52:56,562 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-08-21 19:52:56,567 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 107. [2020-08-21 19:52:56,568 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2020-08-21 19:52:56,568 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 110 transitions. [2020-08-21 19:52:56,568 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 110 transitions. Word has length 100 [2020-08-21 19:52:56,569 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:52:56,569 INFO L479 AbstractCegarLoop]: Abstraction has 107 states and 110 transitions. [2020-08-21 19:52:56,569 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-21 19:52:56,569 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 110 transitions. [2020-08-21 19:52:56,571 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2020-08-21 19:52:56,571 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:52:56,571 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:52:56,571 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-08-21 19:52:56,571 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:52:56,572 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:52:56,572 INFO L82 PathProgramCache]: Analyzing trace with hash 423618004, now seen corresponding path program 30 times [2020-08-21 19:52:56,572 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:52:56,572 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [280607018] [2020-08-21 19:52:56,572 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:52:56,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:56,639 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:52:56,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:52:56,650 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 19:52:56,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat