/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=WIDESTAMONGSMALL --traceabstraction.additional.smt.options tolerance=0.6 --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/simple_4-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-22 00:43:43,691 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-22 00:43:43,694 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-22 00:43:43,731 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-08-22 00:43:43,754 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-22 00:43:43,757 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-22 00:43:43,759 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-22 00:43:43,761 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-22 00:43:43,762 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-22 00:43:43,764 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-22 00:43:43,765 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-22 00:43:43,773 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-22 00:43:43,777 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-22 00:43:43,778 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-22 00:43:43,779 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-22 00:43:43,779 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-22 00:43:43,791 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-22 00:43:43,808 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-22 00:43:43,809 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-22 00:43:43,809 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-22 00:43:43,811 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-22 00:43:43,831 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-22 00:43:43,832 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-22 00:43:43,833 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-22 00:43:43,833 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-22 00:43:43,833 INFO L138 SettingsManager]: * Use SBE=true [2020-08-22 00:43:43,834 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-22 00:43:43,834 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-22 00:43:43,834 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-22 00:43:43,834 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-22 00:43:43,834 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-22 00:43:43,835 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-22 00:43:43,835 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-22 00:43:43,835 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-22 00:43:43,835 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-22 00:43:43,835 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-22 00:43:43,835 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-22 00:43:43,836 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-22 00:43:43,836 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-22 00:43:43,836 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-22 00:43:43,836 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-22 00:43:43,836 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-22 00:43:43,837 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-22 00:43:43,837 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-22 00:43:43,837 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-22 00:43:43,837 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-22 00:43:43,837 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-22 00:43:43,837 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-22 00:43:43,838 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-22 00:43:43,838 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-22 00:43:43,838 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=WIDESTAMONGSMALL;tolerance=0.6;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.6;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.6;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.6;log-additional-information=true; [2020-08-22 00:43:44,156 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-22 00:43:44,175 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-22 00:43:44,179 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-22 00:43:44,181 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-22 00:43:44,181 INFO L275 PluginConnector]: CDTParser initialized [2020-08-22 00:43:44,182 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/simple_4-2.c [2020-08-22 00:43:44,260 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/f2e87f0a3/baa0e52423c24f28811eaf4c64180dd5/FLAG09b992aef [2020-08-22 00:43:44,746 INFO L306 CDTParser]: Found 1 translation units. [2020-08-22 00:43:44,747 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-acceleration/simple_4-2.c [2020-08-22 00:43:44,753 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/f2e87f0a3/baa0e52423c24f28811eaf4c64180dd5/FLAG09b992aef [2020-08-22 00:43:45,117 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/f2e87f0a3/baa0e52423c24f28811eaf4c64180dd5 [2020-08-22 00:43:45,126 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-22 00:43:45,127 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-22 00:43:45,129 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-22 00:43:45,129 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-22 00:43:45,133 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-22 00:43:45,134 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 12:43:45" (1/1) ... [2020-08-22 00:43:45,138 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@54e042c7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 12:43:45, skipping insertion in model container [2020-08-22 00:43:45,138 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 12:43:45" (1/1) ... [2020-08-22 00:43:45,147 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-22 00:43:45,164 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-22 00:43:45,350 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 00:43:45,354 INFO L203 MainTranslator]: Completed pre-run [2020-08-22 00:43:45,366 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 00:43:45,380 INFO L208 MainTranslator]: Completed translation [2020-08-22 00:43:45,380 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 12:43:45 WrapperNode [2020-08-22 00:43:45,380 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-22 00:43:45,381 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-22 00:43:45,381 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-22 00:43:45,382 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-22 00:43:45,392 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 12:43:45" (1/1) ... [2020-08-22 00:43:45,392 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 12:43:45" (1/1) ... [2020-08-22 00:43:45,397 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 12:43:45" (1/1) ... [2020-08-22 00:43:45,397 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 12:43:45" (1/1) ... [2020-08-22 00:43:45,489 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 12:43:45" (1/1) ... [2020-08-22 00:43:45,495 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 12:43:45" (1/1) ... [2020-08-22 00:43:45,496 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 12:43:45" (1/1) ... [2020-08-22 00:43:45,499 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-22 00:43:45,499 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-22 00:43:45,499 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-22 00:43:45,500 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-22 00:43:45,500 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 12:43:45" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-22 00:43:45,561 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-22 00:43:45,561 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-22 00:43:45,561 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-22 00:43:45,561 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-22 00:43:45,561 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-22 00:43:45,562 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-22 00:43:45,562 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-22 00:43:45,562 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-22 00:43:45,562 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-22 00:43:45,723 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-22 00:43:45,723 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-22 00:43:45,726 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 12:43:45 BoogieIcfgContainer [2020-08-22 00:43:45,727 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-22 00:43:45,728 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-22 00:43:45,728 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-22 00:43:45,731 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-22 00:43:45,731 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.08 12:43:45" (1/3) ... [2020-08-22 00:43:45,732 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@49006d2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 12:43:45, skipping insertion in model container [2020-08-22 00:43:45,732 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 12:43:45" (2/3) ... [2020-08-22 00:43:45,733 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@49006d2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 12:43:45, skipping insertion in model container [2020-08-22 00:43:45,733 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 12:43:45" (3/3) ... [2020-08-22 00:43:45,734 INFO L109 eAbstractionObserver]: Analyzing ICFG simple_4-2.c [2020-08-22 00:43:45,744 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-22 00:43:45,751 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-22 00:43:45,762 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-22 00:43:45,782 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-22 00:43:45,782 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-22 00:43:45,783 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-22 00:43:45,783 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-22 00:43:45,783 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-22 00:43:45,783 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-22 00:43:45,783 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-22 00:43:45,783 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-22 00:43:45,800 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2020-08-22 00:43:45,804 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-22 00:43:45,805 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:43:45,805 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:43:45,806 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:43:45,810 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:43:45,810 INFO L82 PathProgramCache]: Analyzing trace with hash 1846144830, now seen corresponding path program 1 times [2020-08-22 00:43:45,817 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:43:45,817 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1370365378] [2020-08-22 00:43:45,818 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:43:45,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:46,019 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:43:46,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:46,026 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:43:46,027 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1370365378] [2020-08-22 00:43:46,029 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 00:43:46,030 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-22 00:43:46,031 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1971362725] [2020-08-22 00:43:46,036 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-22 00:43:46,037 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:43:46,058 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-22 00:43:46,060 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-22 00:43:46,063 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 3 states. [2020-08-22 00:43:46,108 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:43:46,108 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2020-08-22 00:43:46,109 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-22 00:43:46,110 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-08-22 00:43:46,111 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:43:46,122 INFO L225 Difference]: With dead ends: 29 [2020-08-22 00:43:46,122 INFO L226 Difference]: Without dead ends: 12 [2020-08-22 00:43:46,126 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-22 00:43:46,144 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2020-08-22 00:43:46,159 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2020-08-22 00:43:46,161 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2020-08-22 00:43:46,161 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2020-08-22 00:43:46,163 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2020-08-22 00:43:46,164 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:43:46,164 INFO L479 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2020-08-22 00:43:46,164 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-22 00:43:46,164 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2020-08-22 00:43:46,165 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-08-22 00:43:46,165 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:43:46,165 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:43:46,165 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-22 00:43:46,166 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:43:46,166 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:43:46,166 INFO L82 PathProgramCache]: Analyzing trace with hash 1432376145, now seen corresponding path program 1 times [2020-08-22 00:43:46,166 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:43:46,167 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [500843484] [2020-08-22 00:43:46,167 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:43:46,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:46,263 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:43:46,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:46,268 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:43:46,269 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [500843484] [2020-08-22 00:43:46,269 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:43:46,270 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2020-08-22 00:43:46,270 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1823597869] [2020-08-22 00:43:46,272 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-22 00:43:46,272 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:43:46,272 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-22 00:43:46,273 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-22 00:43:46,273 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 4 states. [2020-08-22 00:43:46,291 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:43:46,291 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2020-08-22 00:43:46,292 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-22 00:43:46,292 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 11 [2020-08-22 00:43:46,292 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:43:46,293 INFO L225 Difference]: With dead ends: 18 [2020-08-22 00:43:46,293 INFO L226 Difference]: Without dead ends: 13 [2020-08-22 00:43:46,294 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-22 00:43:46,295 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-08-22 00:43:46,298 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-08-22 00:43:46,299 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-08-22 00:43:46,299 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2020-08-22 00:43:46,300 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 11 [2020-08-22 00:43:46,300 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:43:46,300 INFO L479 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2020-08-22 00:43:46,300 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-22 00:43:46,300 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2020-08-22 00:43:46,301 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-22 00:43:46,301 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:43:46,301 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:43:46,302 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-22 00:43:46,302 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:43:46,302 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:43:46,302 INFO L82 PathProgramCache]: Analyzing trace with hash 1490448798, now seen corresponding path program 2 times [2020-08-22 00:43:46,303 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:43:46,303 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [351164387] [2020-08-22 00:43:46,303 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:43:46,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:46,447 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:43:46,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:46,451 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:43:46,452 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [351164387] [2020-08-22 00:43:46,452 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:43:46,452 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-22 00:43:46,452 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1164964973] [2020-08-22 00:43:46,453 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-22 00:43:46,453 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:43:46,454 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-22 00:43:46,454 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-22 00:43:46,454 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 5 states. [2020-08-22 00:43:46,481 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:43:46,481 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2020-08-22 00:43:46,482 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-22 00:43:46,482 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 12 [2020-08-22 00:43:46,483 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:43:46,483 INFO L225 Difference]: With dead ends: 19 [2020-08-22 00:43:46,483 INFO L226 Difference]: Without dead ends: 14 [2020-08-22 00:43:46,484 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-22 00:43:46,485 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-08-22 00:43:46,489 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-08-22 00:43:46,489 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-08-22 00:43:46,490 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2020-08-22 00:43:46,490 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2020-08-22 00:43:46,490 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:43:46,491 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2020-08-22 00:43:46,491 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-22 00:43:46,491 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2020-08-22 00:43:46,491 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-22 00:43:46,492 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:43:46,492 INFO L422 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:43:46,492 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-22 00:43:46,492 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:43:46,493 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:43:46,493 INFO L82 PathProgramCache]: Analyzing trace with hash -1004266255, now seen corresponding path program 3 times [2020-08-22 00:43:46,493 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:43:46,494 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1733172699] [2020-08-22 00:43:46,494 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:43:46,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:46,593 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:43:46,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:46,596 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:43:46,597 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1733172699] [2020-08-22 00:43:46,597 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:43:46,597 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-22 00:43:46,598 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1334319163] [2020-08-22 00:43:46,598 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-22 00:43:46,598 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:43:46,599 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-22 00:43:46,599 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-22 00:43:46,599 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 6 states. [2020-08-22 00:43:46,629 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:43:46,630 INFO L93 Difference]: Finished difference Result 20 states and 20 transitions. [2020-08-22 00:43:46,630 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-22 00:43:46,631 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 13 [2020-08-22 00:43:46,631 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:43:46,631 INFO L225 Difference]: With dead ends: 20 [2020-08-22 00:43:46,632 INFO L226 Difference]: Without dead ends: 15 [2020-08-22 00:43:46,632 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-22 00:43:46,633 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-22 00:43:46,637 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-22 00:43:46,637 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-22 00:43:46,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2020-08-22 00:43:46,638 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 13 [2020-08-22 00:43:46,638 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:43:46,638 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2020-08-22 00:43:46,638 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-22 00:43:46,639 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2020-08-22 00:43:46,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-08-22 00:43:46,639 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:43:46,639 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:43:46,640 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-22 00:43:46,640 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:43:46,640 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:43:46,641 INFO L82 PathProgramCache]: Analyzing trace with hash -1031021570, now seen corresponding path program 4 times [2020-08-22 00:43:46,641 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:43:46,641 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1980041967] [2020-08-22 00:43:46,641 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:43:46,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:46,756 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:43:46,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:46,760 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:43:46,760 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1980041967] [2020-08-22 00:43:46,761 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:43:46,764 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-22 00:43:46,764 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [978356021] [2020-08-22 00:43:46,765 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-22 00:43:46,765 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:43:46,765 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-22 00:43:46,769 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-08-22 00:43:46,769 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 7 states. [2020-08-22 00:43:46,821 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:43:46,821 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2020-08-22 00:43:46,823 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-22 00:43:46,823 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 14 [2020-08-22 00:43:46,823 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:43:46,824 INFO L225 Difference]: With dead ends: 21 [2020-08-22 00:43:46,824 INFO L226 Difference]: Without dead ends: 16 [2020-08-22 00:43:46,825 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-08-22 00:43:46,825 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-22 00:43:46,830 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-08-22 00:43:46,830 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-22 00:43:46,831 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2020-08-22 00:43:46,831 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 14 [2020-08-22 00:43:46,831 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:43:46,832 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2020-08-22 00:43:46,832 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-22 00:43:46,832 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2020-08-22 00:43:46,833 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-22 00:43:46,833 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:43:46,833 INFO L422 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:43:46,833 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-22 00:43:46,834 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:43:46,834 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:43:46,834 INFO L82 PathProgramCache]: Analyzing trace with hash -1860436335, now seen corresponding path program 5 times [2020-08-22 00:43:46,835 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:43:46,835 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1108397911] [2020-08-22 00:43:46,835 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:43:46,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:46,971 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:43:46,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:46,974 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:43:46,975 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1108397911] [2020-08-22 00:43:46,975 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:43:46,976 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-22 00:43:46,976 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1858110648] [2020-08-22 00:43:46,976 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-22 00:43:46,977 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:43:46,977 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-22 00:43:46,977 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-08-22 00:43:46,978 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 8 states. [2020-08-22 00:43:47,024 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:43:47,025 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2020-08-22 00:43:47,025 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-22 00:43:47,025 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 15 [2020-08-22 00:43:47,026 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:43:47,026 INFO L225 Difference]: With dead ends: 22 [2020-08-22 00:43:47,027 INFO L226 Difference]: Without dead ends: 17 [2020-08-22 00:43:47,027 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-08-22 00:43:47,028 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-22 00:43:47,032 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-22 00:43:47,032 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-22 00:43:47,032 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-08-22 00:43:47,033 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 15 [2020-08-22 00:43:47,033 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:43:47,033 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-08-22 00:43:47,033 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-22 00:43:47,033 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-08-22 00:43:47,034 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-22 00:43:47,034 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:43:47,034 INFO L422 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:43:47,035 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-22 00:43:47,035 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:43:47,035 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:43:47,035 INFO L82 PathProgramCache]: Analyzing trace with hash -1802490274, now seen corresponding path program 6 times [2020-08-22 00:43:47,036 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:43:47,036 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2069502866] [2020-08-22 00:43:47,036 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:43:47,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:47,194 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:43:47,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:47,197 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:43:47,198 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2069502866] [2020-08-22 00:43:47,198 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:43:47,198 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-22 00:43:47,198 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [782946649] [2020-08-22 00:43:47,199 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-22 00:43:47,199 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:43:47,199 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-22 00:43:47,200 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-22 00:43:47,200 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 9 states. [2020-08-22 00:43:47,252 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:43:47,252 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2020-08-22 00:43:47,252 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-22 00:43:47,253 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 16 [2020-08-22 00:43:47,253 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:43:47,253 INFO L225 Difference]: With dead ends: 23 [2020-08-22 00:43:47,254 INFO L226 Difference]: Without dead ends: 18 [2020-08-22 00:43:47,254 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-22 00:43:47,255 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-08-22 00:43:47,258 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-08-22 00:43:47,258 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-22 00:43:47,259 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2020-08-22 00:43:47,259 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 16 [2020-08-22 00:43:47,260 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:43:47,260 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2020-08-22 00:43:47,260 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-22 00:43:47,260 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2020-08-22 00:43:47,261 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-22 00:43:47,261 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:43:47,261 INFO L422 BasicCegarLoop]: trace histogram [7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:43:47,261 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-22 00:43:47,262 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:43:47,262 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:43:47,262 INFO L82 PathProgramCache]: Analyzing trace with hash -6162383, now seen corresponding path program 7 times [2020-08-22 00:43:47,262 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:43:47,263 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2105954311] [2020-08-22 00:43:47,263 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:43:47,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:47,452 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:43:47,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:47,458 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:43:47,458 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2105954311] [2020-08-22 00:43:47,459 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:43:47,459 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-22 00:43:47,459 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1192476539] [2020-08-22 00:43:47,460 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-22 00:43:47,460 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:43:47,460 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-22 00:43:47,460 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2020-08-22 00:43:47,461 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 10 states. [2020-08-22 00:43:47,522 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:43:47,523 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2020-08-22 00:43:47,523 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-22 00:43:47,524 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 17 [2020-08-22 00:43:47,524 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:43:47,524 INFO L225 Difference]: With dead ends: 24 [2020-08-22 00:43:47,525 INFO L226 Difference]: Without dead ends: 19 [2020-08-22 00:43:47,525 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2020-08-22 00:43:47,526 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-08-22 00:43:47,529 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-08-22 00:43:47,530 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-08-22 00:43:47,530 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2020-08-22 00:43:47,531 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 17 [2020-08-22 00:43:47,531 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:43:47,531 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2020-08-22 00:43:47,531 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-22 00:43:47,531 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2020-08-22 00:43:47,532 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-22 00:43:47,532 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:43:47,532 INFO L422 BasicCegarLoop]: trace histogram [8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:43:47,532 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-22 00:43:47,533 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:43:47,533 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:43:47,533 INFO L82 PathProgramCache]: Analyzing trace with hash -154572610, now seen corresponding path program 8 times [2020-08-22 00:43:47,533 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:43:47,534 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [320019973] [2020-08-22 00:43:47,534 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:43:47,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:47,685 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:43:47,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:47,687 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:43:47,688 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [320019973] [2020-08-22 00:43:47,688 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:43:47,688 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-22 00:43:47,689 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [837631307] [2020-08-22 00:43:47,689 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-22 00:43:47,689 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:43:47,690 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-22 00:43:47,690 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-08-22 00:43:47,690 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 11 states. [2020-08-22 00:43:47,763 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:43:47,764 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2020-08-22 00:43:47,764 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-22 00:43:47,764 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 18 [2020-08-22 00:43:47,765 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:43:47,765 INFO L225 Difference]: With dead ends: 25 [2020-08-22 00:43:47,765 INFO L226 Difference]: Without dead ends: 20 [2020-08-22 00:43:47,766 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-08-22 00:43:47,766 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-22 00:43:47,770 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-22 00:43:47,770 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-22 00:43:47,771 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2020-08-22 00:43:47,771 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 18 [2020-08-22 00:43:47,772 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:43:47,772 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2020-08-22 00:43:47,772 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-22 00:43:47,772 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2020-08-22 00:43:47,773 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-22 00:43:47,773 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:43:47,773 INFO L422 BasicCegarLoop]: trace histogram [9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:43:47,773 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-22 00:43:47,773 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:43:47,774 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:43:47,774 INFO L82 PathProgramCache]: Analyzing trace with hash -460322351, now seen corresponding path program 9 times [2020-08-22 00:43:47,774 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:43:47,775 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [530358803] [2020-08-22 00:43:47,775 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:43:47,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:47,964 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:43:47,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:47,969 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:43:47,969 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [530358803] [2020-08-22 00:43:47,970 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:43:47,970 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-22 00:43:47,970 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2007455802] [2020-08-22 00:43:47,971 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-22 00:43:47,971 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:43:47,971 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-22 00:43:47,972 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-08-22 00:43:47,972 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 12 states. [2020-08-22 00:43:48,069 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:43:48,070 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2020-08-22 00:43:48,070 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-22 00:43:48,071 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 19 [2020-08-22 00:43:48,071 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:43:48,072 INFO L225 Difference]: With dead ends: 26 [2020-08-22 00:43:48,073 INFO L226 Difference]: Without dead ends: 21 [2020-08-22 00:43:48,074 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-08-22 00:43:48,075 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-22 00:43:48,079 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-08-22 00:43:48,079 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-22 00:43:48,082 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2020-08-22 00:43:48,083 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 19 [2020-08-22 00:43:48,083 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:43:48,083 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2020-08-22 00:43:48,083 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-22 00:43:48,083 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2020-08-22 00:43:48,084 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-22 00:43:48,084 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:43:48,084 INFO L422 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:43:48,085 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-22 00:43:48,085 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:43:48,085 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:43:48,086 INFO L82 PathProgramCache]: Analyzing trace with hash -1348629730, now seen corresponding path program 10 times [2020-08-22 00:43:48,086 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:43:48,086 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [557665803] [2020-08-22 00:43:48,086 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:43:48,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:48,295 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:43:48,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:48,300 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:43:48,301 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [557665803] [2020-08-22 00:43:48,301 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:43:48,301 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-22 00:43:48,301 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [962423445] [2020-08-22 00:43:48,302 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-22 00:43:48,302 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:43:48,302 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-22 00:43:48,303 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2020-08-22 00:43:48,303 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 13 states. [2020-08-22 00:43:48,393 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:43:48,393 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2020-08-22 00:43:48,394 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-22 00:43:48,394 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 20 [2020-08-22 00:43:48,394 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:43:48,395 INFO L225 Difference]: With dead ends: 27 [2020-08-22 00:43:48,395 INFO L226 Difference]: Without dead ends: 22 [2020-08-22 00:43:48,396 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2020-08-22 00:43:48,396 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-22 00:43:48,399 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2020-08-22 00:43:48,400 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-08-22 00:43:48,400 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2020-08-22 00:43:48,401 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 20 [2020-08-22 00:43:48,401 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:43:48,401 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2020-08-22 00:43:48,401 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-22 00:43:48,401 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2020-08-22 00:43:48,402 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-08-22 00:43:48,402 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:43:48,402 INFO L422 BasicCegarLoop]: trace histogram [11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:43:48,403 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-22 00:43:48,403 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:43:48,403 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:43:48,403 INFO L82 PathProgramCache]: Analyzing trace with hash 1178612593, now seen corresponding path program 11 times [2020-08-22 00:43:48,404 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:43:48,404 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2010620050] [2020-08-22 00:43:48,404 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:43:48,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:48,619 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:43:48,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:48,622 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:43:48,623 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2010620050] [2020-08-22 00:43:48,623 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:43:48,623 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-22 00:43:48,623 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [680831028] [2020-08-22 00:43:48,624 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-22 00:43:48,624 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:43:48,624 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-22 00:43:48,624 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2020-08-22 00:43:48,625 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 14 states. [2020-08-22 00:43:48,747 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:43:48,747 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2020-08-22 00:43:48,748 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-22 00:43:48,748 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 21 [2020-08-22 00:43:48,748 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:43:48,749 INFO L225 Difference]: With dead ends: 28 [2020-08-22 00:43:48,749 INFO L226 Difference]: Without dead ends: 23 [2020-08-22 00:43:48,750 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2020-08-22 00:43:48,750 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-22 00:43:48,753 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-08-22 00:43:48,754 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-22 00:43:48,754 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2020-08-22 00:43:48,755 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 21 [2020-08-22 00:43:48,755 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:43:48,755 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2020-08-22 00:43:48,755 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-22 00:43:48,755 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2020-08-22 00:43:48,756 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-22 00:43:48,756 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:43:48,756 INFO L422 BasicCegarLoop]: trace histogram [12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:43:48,757 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-22 00:43:48,757 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:43:48,757 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:43:48,757 INFO L82 PathProgramCache]: Analyzing trace with hash -2081254018, now seen corresponding path program 12 times [2020-08-22 00:43:48,757 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:43:48,758 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [132019645] [2020-08-22 00:43:48,758 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:43:48,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:48,964 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:43:48,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:48,968 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:43:48,968 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [132019645] [2020-08-22 00:43:48,968 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:43:48,968 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-22 00:43:48,969 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1203726744] [2020-08-22 00:43:48,969 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-22 00:43:48,969 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:43:48,970 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-22 00:43:48,970 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2020-08-22 00:43:48,970 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 15 states. [2020-08-22 00:43:49,096 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:43:49,097 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2020-08-22 00:43:49,097 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-22 00:43:49,098 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 22 [2020-08-22 00:43:49,098 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:43:49,098 INFO L225 Difference]: With dead ends: 29 [2020-08-22 00:43:49,098 INFO L226 Difference]: Without dead ends: 24 [2020-08-22 00:43:49,099 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2020-08-22 00:43:49,099 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-22 00:43:49,105 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-08-22 00:43:49,105 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-22 00:43:49,106 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2020-08-22 00:43:49,106 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 22 [2020-08-22 00:43:49,106 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:43:49,106 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2020-08-22 00:43:49,106 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-22 00:43:49,106 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2020-08-22 00:43:49,107 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-08-22 00:43:49,107 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:43:49,107 INFO L422 BasicCegarLoop]: trace histogram [13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:43:49,107 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-22 00:43:49,108 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:43:49,109 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:43:49,109 INFO L82 PathProgramCache]: Analyzing trace with hash -57903855, now seen corresponding path program 13 times [2020-08-22 00:43:49,109 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:43:49,112 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1063338831] [2020-08-22 00:43:49,112 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:43:49,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:49,359 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:43:49,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:49,362 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:43:49,363 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1063338831] [2020-08-22 00:43:49,366 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:43:49,366 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-22 00:43:49,366 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1534167116] [2020-08-22 00:43:49,366 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-22 00:43:49,367 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:43:49,367 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-22 00:43:49,367 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2020-08-22 00:43:49,367 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 16 states. [2020-08-22 00:43:49,507 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:43:49,509 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2020-08-22 00:43:49,510 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-22 00:43:49,510 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 23 [2020-08-22 00:43:49,510 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:43:49,511 INFO L225 Difference]: With dead ends: 30 [2020-08-22 00:43:49,511 INFO L226 Difference]: Without dead ends: 25 [2020-08-22 00:43:49,511 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2020-08-22 00:43:49,513 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-22 00:43:49,523 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-08-22 00:43:49,523 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-22 00:43:49,524 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2020-08-22 00:43:49,524 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 23 [2020-08-22 00:43:49,524 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:43:49,524 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2020-08-22 00:43:49,524 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-22 00:43:49,524 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2020-08-22 00:43:49,525 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-22 00:43:49,525 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:43:49,525 INFO L422 BasicCegarLoop]: trace histogram [14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:43:49,526 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-22 00:43:49,529 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:43:49,529 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:43:49,529 INFO L82 PathProgramCache]: Analyzing trace with hash -1758558242, now seen corresponding path program 14 times [2020-08-22 00:43:49,530 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:43:49,530 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1495905890] [2020-08-22 00:43:49,530 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:43:49,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:49,775 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:43:49,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:49,778 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:43:49,779 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1495905890] [2020-08-22 00:43:49,779 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:43:49,779 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-22 00:43:49,779 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [156828992] [2020-08-22 00:43:49,781 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-22 00:43:49,781 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:43:49,781 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-22 00:43:49,781 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2020-08-22 00:43:49,781 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 17 states. [2020-08-22 00:43:49,913 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:43:49,913 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2020-08-22 00:43:49,914 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-22 00:43:49,914 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 24 [2020-08-22 00:43:49,914 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:43:49,914 INFO L225 Difference]: With dead ends: 31 [2020-08-22 00:43:49,915 INFO L226 Difference]: Without dead ends: 26 [2020-08-22 00:43:49,915 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2020-08-22 00:43:49,916 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-22 00:43:49,919 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-08-22 00:43:49,919 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-22 00:43:49,919 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2020-08-22 00:43:49,920 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 24 [2020-08-22 00:43:49,920 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:43:49,920 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2020-08-22 00:43:49,920 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-22 00:43:49,920 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2020-08-22 00:43:49,921 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-22 00:43:49,921 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:43:49,921 INFO L422 BasicCegarLoop]: trace histogram [15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:43:49,921 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-22 00:43:49,922 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:43:49,922 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:43:49,922 INFO L82 PathProgramCache]: Analyzing trace with hash 1355730609, now seen corresponding path program 15 times [2020-08-22 00:43:49,922 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:43:49,923 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [949148999] [2020-08-22 00:43:49,923 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:43:49,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:50,211 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:43:50,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:50,214 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:43:50,214 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [949148999] [2020-08-22 00:43:50,214 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:43:50,214 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-22 00:43:50,215 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2145618060] [2020-08-22 00:43:50,215 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-22 00:43:50,215 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:43:50,216 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-22 00:43:50,216 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2020-08-22 00:43:50,216 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 18 states. [2020-08-22 00:43:50,380 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:43:50,380 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2020-08-22 00:43:50,381 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-22 00:43:50,382 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 25 [2020-08-22 00:43:50,382 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:43:50,382 INFO L225 Difference]: With dead ends: 32 [2020-08-22 00:43:50,383 INFO L226 Difference]: Without dead ends: 27 [2020-08-22 00:43:50,383 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2020-08-22 00:43:50,384 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-08-22 00:43:50,387 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-08-22 00:43:50,388 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-22 00:43:50,388 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2020-08-22 00:43:50,388 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 25 [2020-08-22 00:43:50,389 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:43:50,389 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2020-08-22 00:43:50,389 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-22 00:43:50,389 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2020-08-22 00:43:50,391 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-22 00:43:50,392 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:43:50,392 INFO L422 BasicCegarLoop]: trace histogram [16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:43:50,392 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-22 00:43:50,392 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:43:50,392 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:43:50,393 INFO L82 PathProgramCache]: Analyzing trace with hash -885562818, now seen corresponding path program 16 times [2020-08-22 00:43:50,393 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:43:50,393 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1257308758] [2020-08-22 00:43:50,393 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:43:50,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:50,699 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:43:50,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:50,702 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:43:50,702 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1257308758] [2020-08-22 00:43:50,703 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:43:50,703 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-22 00:43:50,703 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1066150815] [2020-08-22 00:43:50,703 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-22 00:43:50,704 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:43:50,704 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-22 00:43:50,704 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2020-08-22 00:43:50,705 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 19 states. [2020-08-22 00:43:50,937 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:43:50,937 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2020-08-22 00:43:50,939 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-22 00:43:50,939 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 26 [2020-08-22 00:43:50,939 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:43:50,940 INFO L225 Difference]: With dead ends: 33 [2020-08-22 00:43:50,940 INFO L226 Difference]: Without dead ends: 28 [2020-08-22 00:43:50,941 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2020-08-22 00:43:50,941 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-22 00:43:50,945 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-08-22 00:43:50,945 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-22 00:43:50,946 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2020-08-22 00:43:50,946 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 26 [2020-08-22 00:43:50,946 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:43:50,946 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2020-08-22 00:43:50,946 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-22 00:43:50,947 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2020-08-22 00:43:50,948 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-22 00:43:50,948 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:43:50,949 INFO L422 BasicCegarLoop]: trace histogram [17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:43:50,949 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-22 00:43:50,949 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:43:50,949 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:43:50,950 INFO L82 PathProgramCache]: Analyzing trace with hash -1646182319, now seen corresponding path program 17 times [2020-08-22 00:43:50,950 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:43:50,951 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1331183272] [2020-08-22 00:43:50,951 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:43:50,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:51,315 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:43:51,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:51,318 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:43:51,319 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1331183272] [2020-08-22 00:43:51,319 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:43:51,319 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-22 00:43:51,320 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2116719351] [2020-08-22 00:43:51,323 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-22 00:43:51,323 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:43:51,323 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-22 00:43:51,324 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2020-08-22 00:43:51,324 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 20 states. [2020-08-22 00:43:51,561 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:43:51,561 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2020-08-22 00:43:51,562 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-22 00:43:51,562 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 27 [2020-08-22 00:43:51,562 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:43:51,562 INFO L225 Difference]: With dead ends: 34 [2020-08-22 00:43:51,563 INFO L226 Difference]: Without dead ends: 29 [2020-08-22 00:43:51,563 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2020-08-22 00:43:51,564 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-22 00:43:51,567 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-08-22 00:43:51,567 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-22 00:43:51,568 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2020-08-22 00:43:51,568 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 27 [2020-08-22 00:43:51,568 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:43:51,568 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2020-08-22 00:43:51,568 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-22 00:43:51,568 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2020-08-22 00:43:51,569 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-22 00:43:51,569 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:43:51,569 INFO L422 BasicCegarLoop]: trace histogram [18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:43:51,569 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-22 00:43:51,570 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:43:51,570 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:43:51,570 INFO L82 PathProgramCache]: Analyzing trace with hash 544416926, now seen corresponding path program 18 times [2020-08-22 00:43:51,570 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:43:51,570 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [152304897] [2020-08-22 00:43:51,571 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:43:51,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:51,903 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:43:51,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:51,906 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:43:51,906 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [152304897] [2020-08-22 00:43:51,907 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:43:51,907 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-22 00:43:51,907 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [796010891] [2020-08-22 00:43:51,907 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-22 00:43:51,908 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:43:51,908 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-22 00:43:51,908 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=363, Unknown=0, NotChecked=0, Total=420 [2020-08-22 00:43:51,908 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 21 states. [2020-08-22 00:43:52,157 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:43:52,157 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2020-08-22 00:43:52,158 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-22 00:43:52,158 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 28 [2020-08-22 00:43:52,158 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:43:52,159 INFO L225 Difference]: With dead ends: 35 [2020-08-22 00:43:52,159 INFO L226 Difference]: Without dead ends: 30 [2020-08-22 00:43:52,160 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=57, Invalid=363, Unknown=0, NotChecked=0, Total=420 [2020-08-22 00:43:52,160 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-22 00:43:52,164 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-08-22 00:43:52,164 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-08-22 00:43:52,164 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2020-08-22 00:43:52,165 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 28 [2020-08-22 00:43:52,165 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:43:52,165 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2020-08-22 00:43:52,165 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-22 00:43:52,165 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2020-08-22 00:43:52,166 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-08-22 00:43:52,166 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:43:52,166 INFO L422 BasicCegarLoop]: trace histogram [19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:43:52,166 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-22 00:43:52,166 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:43:52,167 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:43:52,167 INFO L82 PathProgramCache]: Analyzing trace with hash -266483215, now seen corresponding path program 19 times [2020-08-22 00:43:52,167 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:43:52,167 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1932479679] [2020-08-22 00:43:52,167 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:43:52,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:52,658 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:43:52,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:52,662 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:43:52,662 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1932479679] [2020-08-22 00:43:52,662 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:43:52,663 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-22 00:43:52,663 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [814281824] [2020-08-22 00:43:52,663 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-22 00:43:52,664 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:43:52,664 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-22 00:43:52,664 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=402, Unknown=0, NotChecked=0, Total=462 [2020-08-22 00:43:52,665 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 22 states. [2020-08-22 00:43:52,909 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:43:52,909 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2020-08-22 00:43:52,910 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-22 00:43:52,910 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 29 [2020-08-22 00:43:52,910 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:43:52,911 INFO L225 Difference]: With dead ends: 36 [2020-08-22 00:43:52,911 INFO L226 Difference]: Without dead ends: 31 [2020-08-22 00:43:52,912 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=60, Invalid=402, Unknown=0, NotChecked=0, Total=462 [2020-08-22 00:43:52,912 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-22 00:43:52,917 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2020-08-22 00:43:52,918 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-22 00:43:52,918 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2020-08-22 00:43:52,918 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 29 [2020-08-22 00:43:52,919 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:43:52,919 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2020-08-22 00:43:52,919 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-22 00:43:52,919 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2020-08-22 00:43:52,919 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-22 00:43:52,920 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:43:52,920 INFO L422 BasicCegarLoop]: trace histogram [20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:43:52,920 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-22 00:43:52,920 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:43:52,920 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:43:52,920 INFO L82 PathProgramCache]: Analyzing trace with hash 365416190, now seen corresponding path program 20 times [2020-08-22 00:43:52,921 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:43:52,921 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [218795164] [2020-08-22 00:43:52,921 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:43:52,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:53,315 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:43:53,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:53,319 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:43:53,320 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [218795164] [2020-08-22 00:43:53,320 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:43:53,320 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-22 00:43:53,320 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1542964989] [2020-08-22 00:43:53,321 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-22 00:43:53,321 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:43:53,321 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-22 00:43:53,322 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2020-08-22 00:43:53,322 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 23 states. [2020-08-22 00:43:53,635 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:43:53,635 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2020-08-22 00:43:53,636 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-22 00:43:53,636 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 30 [2020-08-22 00:43:53,636 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:43:53,636 INFO L225 Difference]: With dead ends: 37 [2020-08-22 00:43:53,637 INFO L226 Difference]: Without dead ends: 32 [2020-08-22 00:43:53,637 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2020-08-22 00:43:53,637 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-22 00:43:53,642 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2020-08-22 00:43:53,642 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-08-22 00:43:53,643 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2020-08-22 00:43:53,643 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 30 [2020-08-22 00:43:53,643 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:43:53,644 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2020-08-22 00:43:53,644 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-22 00:43:53,644 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2020-08-22 00:43:53,644 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-22 00:43:53,644 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:43:53,645 INFO L422 BasicCegarLoop]: trace histogram [21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:43:53,645 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-22 00:43:53,645 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:43:53,645 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:43:53,645 INFO L82 PathProgramCache]: Analyzing trace with hash -1520538735, now seen corresponding path program 21 times [2020-08-22 00:43:53,645 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:43:53,646 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1285030586] [2020-08-22 00:43:53,646 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:43:53,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:54,092 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:43:54,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:54,095 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:43:54,095 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1285030586] [2020-08-22 00:43:54,096 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:43:54,096 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-22 00:43:54,096 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [70752337] [2020-08-22 00:43:54,096 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-22 00:43:54,097 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:43:54,097 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-22 00:43:54,097 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=486, Unknown=0, NotChecked=0, Total=552 [2020-08-22 00:43:54,097 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 24 states. [2020-08-22 00:43:54,430 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:43:54,431 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2020-08-22 00:43:54,433 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-22 00:43:54,434 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 31 [2020-08-22 00:43:54,434 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:43:54,435 INFO L225 Difference]: With dead ends: 38 [2020-08-22 00:43:54,435 INFO L226 Difference]: Without dead ends: 33 [2020-08-22 00:43:54,435 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=66, Invalid=486, Unknown=0, NotChecked=0, Total=552 [2020-08-22 00:43:54,436 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-22 00:43:54,439 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-08-22 00:43:54,439 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-22 00:43:54,440 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2020-08-22 00:43:54,440 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 31 [2020-08-22 00:43:54,440 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:43:54,440 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2020-08-22 00:43:54,441 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-22 00:43:54,441 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2020-08-22 00:43:54,441 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-22 00:43:54,441 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:43:54,441 INFO L422 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:43:54,442 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-22 00:43:54,442 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:43:54,442 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:43:54,442 INFO L82 PathProgramCache]: Analyzing trace with hash 144400734, now seen corresponding path program 22 times [2020-08-22 00:43:54,442 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:43:54,443 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [169543147] [2020-08-22 00:43:54,443 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:43:54,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:54,931 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:43:54,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:54,935 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:43:54,935 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [169543147] [2020-08-22 00:43:54,935 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:43:54,935 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-22 00:43:54,936 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [719005160] [2020-08-22 00:43:54,936 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-22 00:43:54,936 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:43:54,936 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-22 00:43:54,937 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=531, Unknown=0, NotChecked=0, Total=600 [2020-08-22 00:43:54,937 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 25 states. [2020-08-22 00:43:55,304 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:43:55,304 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2020-08-22 00:43:55,305 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-22 00:43:55,305 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 32 [2020-08-22 00:43:55,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:43:55,306 INFO L225 Difference]: With dead ends: 39 [2020-08-22 00:43:55,306 INFO L226 Difference]: Without dead ends: 34 [2020-08-22 00:43:55,306 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=69, Invalid=531, Unknown=0, NotChecked=0, Total=600 [2020-08-22 00:43:55,306 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-22 00:43:55,311 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-08-22 00:43:55,311 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-22 00:43:55,312 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2020-08-22 00:43:55,312 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 32 [2020-08-22 00:43:55,312 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:43:55,312 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2020-08-22 00:43:55,312 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-22 00:43:55,312 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2020-08-22 00:43:55,313 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-22 00:43:55,313 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:43:55,313 INFO L422 BasicCegarLoop]: trace histogram [23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:43:55,313 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-22 00:43:55,314 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:43:55,314 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:43:55,314 INFO L82 PathProgramCache]: Analyzing trace with hash 217916721, now seen corresponding path program 23 times [2020-08-22 00:43:55,314 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:43:55,314 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1729562669] [2020-08-22 00:43:55,314 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:43:55,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:55,802 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:43:55,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:55,805 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:43:55,805 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1729562669] [2020-08-22 00:43:55,806 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:43:55,806 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-22 00:43:55,806 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1477903809] [2020-08-22 00:43:55,806 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-22 00:43:55,807 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:43:55,807 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-22 00:43:55,807 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=578, Unknown=0, NotChecked=0, Total=650 [2020-08-22 00:43:55,807 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand 26 states. [2020-08-22 00:43:56,208 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:43:56,208 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2020-08-22 00:43:56,209 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-22 00:43:56,209 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 33 [2020-08-22 00:43:56,209 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:43:56,210 INFO L225 Difference]: With dead ends: 40 [2020-08-22 00:43:56,210 INFO L226 Difference]: Without dead ends: 35 [2020-08-22 00:43:56,211 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=72, Invalid=578, Unknown=0, NotChecked=0, Total=650 [2020-08-22 00:43:56,211 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-22 00:43:56,216 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-08-22 00:43:56,216 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-22 00:43:56,216 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2020-08-22 00:43:56,217 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 33 [2020-08-22 00:43:56,217 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:43:56,217 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2020-08-22 00:43:56,217 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-22 00:43:56,217 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2020-08-22 00:43:56,217 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-22 00:43:56,218 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:43:56,218 INFO L422 BasicCegarLoop]: trace histogram [24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:43:56,218 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-22 00:43:56,218 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:43:56,219 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:43:56,219 INFO L82 PathProgramCache]: Analyzing trace with hash -1798054978, now seen corresponding path program 24 times [2020-08-22 00:43:56,219 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:43:56,219 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1611990444] [2020-08-22 00:43:56,219 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:43:56,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:56,893 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:43:56,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:56,899 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:43:56,899 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1611990444] [2020-08-22 00:43:56,899 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:43:56,899 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-22 00:43:56,900 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [705975458] [2020-08-22 00:43:56,900 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-22 00:43:56,900 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:43:56,900 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-22 00:43:56,901 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=627, Unknown=0, NotChecked=0, Total=702 [2020-08-22 00:43:56,901 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 27 states. [2020-08-22 00:43:57,358 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:43:57,359 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2020-08-22 00:43:57,359 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-22 00:43:57,359 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 34 [2020-08-22 00:43:57,360 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:43:57,360 INFO L225 Difference]: With dead ends: 41 [2020-08-22 00:43:57,360 INFO L226 Difference]: Without dead ends: 36 [2020-08-22 00:43:57,361 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=75, Invalid=627, Unknown=0, NotChecked=0, Total=702 [2020-08-22 00:43:57,361 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-22 00:43:57,366 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-08-22 00:43:57,366 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-22 00:43:57,367 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2020-08-22 00:43:57,367 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 34 [2020-08-22 00:43:57,367 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:43:57,368 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2020-08-22 00:43:57,368 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-22 00:43:57,368 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2020-08-22 00:43:57,368 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-08-22 00:43:57,368 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:43:57,369 INFO L422 BasicCegarLoop]: trace histogram [25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:43:57,369 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-22 00:43:57,369 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:43:57,369 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:43:57,369 INFO L82 PathProgramCache]: Analyzing trace with hash 131331793, now seen corresponding path program 25 times [2020-08-22 00:43:57,370 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:43:57,371 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1391700852] [2020-08-22 00:43:57,371 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:43:57,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:58,041 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:43:58,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:58,046 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:43:58,046 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1391700852] [2020-08-22 00:43:58,046 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:43:58,047 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-22 00:43:58,047 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1030322792] [2020-08-22 00:43:58,047 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-22 00:43:58,047 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:43:58,047 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-22 00:43:58,048 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=678, Unknown=0, NotChecked=0, Total=756 [2020-08-22 00:43:58,048 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 28 states. [2020-08-22 00:43:58,522 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:43:58,522 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2020-08-22 00:43:58,522 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-22 00:43:58,522 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 35 [2020-08-22 00:43:58,523 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:43:58,523 INFO L225 Difference]: With dead ends: 42 [2020-08-22 00:43:58,523 INFO L226 Difference]: Without dead ends: 37 [2020-08-22 00:43:58,524 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=78, Invalid=678, Unknown=0, NotChecked=0, Total=756 [2020-08-22 00:43:58,524 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-22 00:43:58,537 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-08-22 00:43:58,538 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-22 00:43:58,538 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2020-08-22 00:43:58,538 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 35 [2020-08-22 00:43:58,539 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:43:58,539 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2020-08-22 00:43:58,539 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-22 00:43:58,539 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2020-08-22 00:43:58,542 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-22 00:43:58,542 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:43:58,542 INFO L422 BasicCegarLoop]: trace histogram [26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:43:58,542 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-22 00:43:58,543 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:43:58,543 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:43:58,543 INFO L82 PathProgramCache]: Analyzing trace with hash -187220450, now seen corresponding path program 26 times [2020-08-22 00:43:58,544 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:43:58,544 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [992166585] [2020-08-22 00:43:58,544 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:43:58,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:59,172 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:43:59,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:59,177 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:43:59,177 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [992166585] [2020-08-22 00:43:59,177 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:43:59,177 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-22 00:43:59,178 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1954685591] [2020-08-22 00:43:59,178 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-22 00:43:59,178 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:43:59,179 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-22 00:43:59,179 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=731, Unknown=0, NotChecked=0, Total=812 [2020-08-22 00:43:59,179 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 29 states. [2020-08-22 00:43:59,651 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:43:59,651 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2020-08-22 00:43:59,651 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-22 00:43:59,652 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 36 [2020-08-22 00:43:59,652 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:43:59,652 INFO L225 Difference]: With dead ends: 43 [2020-08-22 00:43:59,653 INFO L226 Difference]: Without dead ends: 38 [2020-08-22 00:43:59,653 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=81, Invalid=731, Unknown=0, NotChecked=0, Total=812 [2020-08-22 00:43:59,653 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-22 00:43:59,668 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-08-22 00:43:59,669 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-22 00:43:59,669 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2020-08-22 00:43:59,669 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 36 [2020-08-22 00:43:59,669 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:43:59,670 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2020-08-22 00:43:59,670 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-22 00:43:59,670 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2020-08-22 00:43:59,670 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-22 00:43:59,670 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:43:59,671 INFO L422 BasicCegarLoop]: trace histogram [27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:43:59,671 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-22 00:43:59,671 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:43:59,671 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:43:59,671 INFO L82 PathProgramCache]: Analyzing trace with hash -1472405391, now seen corresponding path program 27 times [2020-08-22 00:43:59,672 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:43:59,672 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [509801032] [2020-08-22 00:43:59,672 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:43:59,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:00,311 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:44:00,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:00,315 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:44:00,316 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [509801032] [2020-08-22 00:44:00,316 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:44:00,316 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-22 00:44:00,316 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1486263742] [2020-08-22 00:44:00,317 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-22 00:44:00,317 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:44:00,317 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-22 00:44:00,318 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=786, Unknown=0, NotChecked=0, Total=870 [2020-08-22 00:44:00,318 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 30 states. [2020-08-22 00:44:00,813 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:44:00,813 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2020-08-22 00:44:00,814 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-22 00:44:00,814 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 37 [2020-08-22 00:44:00,814 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:44:00,815 INFO L225 Difference]: With dead ends: 44 [2020-08-22 00:44:00,815 INFO L226 Difference]: Without dead ends: 39 [2020-08-22 00:44:00,815 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=84, Invalid=786, Unknown=0, NotChecked=0, Total=870 [2020-08-22 00:44:00,816 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-22 00:44:00,819 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-08-22 00:44:00,819 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-22 00:44:00,819 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2020-08-22 00:44:00,819 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 37 [2020-08-22 00:44:00,820 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:44:00,820 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2020-08-22 00:44:00,820 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-22 00:44:00,820 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2020-08-22 00:44:00,820 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-22 00:44:00,820 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:44:00,821 INFO L422 BasicCegarLoop]: trace histogram [28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:44:00,821 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-22 00:44:00,821 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:44:00,821 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:44:00,821 INFO L82 PathProgramCache]: Analyzing trace with hash 1636534398, now seen corresponding path program 28 times [2020-08-22 00:44:00,821 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:44:00,822 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1185271479] [2020-08-22 00:44:00,822 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:44:00,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:01,531 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:44:01,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:01,537 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:44:01,537 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1185271479] [2020-08-22 00:44:01,538 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:44:01,538 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-22 00:44:01,538 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1353390165] [2020-08-22 00:44:01,538 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-22 00:44:01,538 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:44:01,539 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-22 00:44:01,539 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=843, Unknown=0, NotChecked=0, Total=930 [2020-08-22 00:44:01,539 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 31 states. [2020-08-22 00:44:02,078 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:44:02,078 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2020-08-22 00:44:02,079 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-22 00:44:02,079 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 38 [2020-08-22 00:44:02,079 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:44:02,080 INFO L225 Difference]: With dead ends: 45 [2020-08-22 00:44:02,080 INFO L226 Difference]: Without dead ends: 40 [2020-08-22 00:44:02,081 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=87, Invalid=843, Unknown=0, NotChecked=0, Total=930 [2020-08-22 00:44:02,082 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-22 00:44:02,085 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2020-08-22 00:44:02,085 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-22 00:44:02,085 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 40 transitions. [2020-08-22 00:44:02,086 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 40 transitions. Word has length 38 [2020-08-22 00:44:02,086 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:44:02,086 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 40 transitions. [2020-08-22 00:44:02,086 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-22 00:44:02,086 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 40 transitions. [2020-08-22 00:44:02,086 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-22 00:44:02,087 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:44:02,087 INFO L422 BasicCegarLoop]: trace histogram [29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:44:02,087 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-22 00:44:02,087 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:44:02,087 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:44:02,087 INFO L82 PathProgramCache]: Analyzing trace with hash -770579951, now seen corresponding path program 29 times [2020-08-22 00:44:02,088 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:44:02,088 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [150505531] [2020-08-22 00:44:02,088 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:44:02,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:02,851 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:44:02,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:02,855 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:44:02,856 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [150505531] [2020-08-22 00:44:02,856 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:44:02,856 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-22 00:44:02,856 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [347557665] [2020-08-22 00:44:02,856 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-22 00:44:02,857 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:44:02,857 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-22 00:44:02,857 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=902, Unknown=0, NotChecked=0, Total=992 [2020-08-22 00:44:02,857 INFO L87 Difference]: Start difference. First operand 40 states and 40 transitions. Second operand 32 states. [2020-08-22 00:44:03,466 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:44:03,466 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2020-08-22 00:44:03,467 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-22 00:44:03,467 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 39 [2020-08-22 00:44:03,467 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:44:03,468 INFO L225 Difference]: With dead ends: 46 [2020-08-22 00:44:03,468 INFO L226 Difference]: Without dead ends: 41 [2020-08-22 00:44:03,469 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=90, Invalid=902, Unknown=0, NotChecked=0, Total=992 [2020-08-22 00:44:03,469 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-22 00:44:03,472 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-08-22 00:44:03,472 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-22 00:44:03,473 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2020-08-22 00:44:03,473 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 39 [2020-08-22 00:44:03,473 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:44:03,473 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2020-08-22 00:44:03,473 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-22 00:44:03,473 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2020-08-22 00:44:03,474 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-22 00:44:03,474 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:44:03,474 INFO L422 BasicCegarLoop]: trace histogram [30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:44:03,474 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-22 00:44:03,474 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:44:03,474 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:44:03,475 INFO L82 PathProgramCache]: Analyzing trace with hash 1918286558, now seen corresponding path program 30 times [2020-08-22 00:44:03,475 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:44:03,475 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1740944546] [2020-08-22 00:44:03,475 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:44:03,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:04,228 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:44:04,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:04,233 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:44:04,233 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1740944546] [2020-08-22 00:44:04,233 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:44:04,234 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-22 00:44:04,234 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1179438769] [2020-08-22 00:44:04,234 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-22 00:44:04,234 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:44:04,235 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-22 00:44:04,235 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=963, Unknown=0, NotChecked=0, Total=1056 [2020-08-22 00:44:04,235 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 33 states. [2020-08-22 00:44:04,851 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:44:04,851 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2020-08-22 00:44:04,853 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-22 00:44:04,853 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 40 [2020-08-22 00:44:04,853 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:44:04,854 INFO L225 Difference]: With dead ends: 47 [2020-08-22 00:44:04,854 INFO L226 Difference]: Without dead ends: 42 [2020-08-22 00:44:04,855 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=93, Invalid=963, Unknown=0, NotChecked=0, Total=1056 [2020-08-22 00:44:04,855 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-22 00:44:04,858 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-08-22 00:44:04,858 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-22 00:44:04,859 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2020-08-22 00:44:04,859 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 40 [2020-08-22 00:44:04,859 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:44:04,859 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2020-08-22 00:44:04,859 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-22 00:44:04,860 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2020-08-22 00:44:04,860 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-22 00:44:04,860 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:44:04,860 INFO L422 BasicCegarLoop]: trace histogram [31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:44:04,860 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-22 00:44:04,860 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:44:04,860 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:44:04,861 INFO L82 PathProgramCache]: Analyzing trace with hash -626197583, now seen corresponding path program 31 times [2020-08-22 00:44:04,861 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:44:04,861 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [353035003] [2020-08-22 00:44:04,861 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:44:04,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:05,614 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:44:05,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:05,619 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:44:05,619 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [353035003] [2020-08-22 00:44:05,619 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:44:05,620 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-22 00:44:05,620 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1807575873] [2020-08-22 00:44:05,620 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-22 00:44:05,620 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:44:05,620 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-22 00:44:05,621 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=1026, Unknown=0, NotChecked=0, Total=1122 [2020-08-22 00:44:05,621 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand 34 states. [2020-08-22 00:44:06,281 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:44:06,282 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2020-08-22 00:44:06,282 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-22 00:44:06,282 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 41 [2020-08-22 00:44:06,282 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:44:06,283 INFO L225 Difference]: With dead ends: 48 [2020-08-22 00:44:06,283 INFO L226 Difference]: Without dead ends: 43 [2020-08-22 00:44:06,284 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=96, Invalid=1026, Unknown=0, NotChecked=0, Total=1122 [2020-08-22 00:44:06,284 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-22 00:44:06,288 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-08-22 00:44:06,289 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-22 00:44:06,289 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2020-08-22 00:44:06,290 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 41 [2020-08-22 00:44:06,290 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:44:06,290 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2020-08-22 00:44:06,290 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-22 00:44:06,290 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2020-08-22 00:44:06,291 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-22 00:44:06,291 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:44:06,291 INFO L422 BasicCegarLoop]: trace histogram [32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:44:06,291 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-22 00:44:06,291 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:44:06,292 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:44:06,292 INFO L82 PathProgramCache]: Analyzing trace with hash 2099172670, now seen corresponding path program 32 times [2020-08-22 00:44:06,292 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:44:06,292 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [405726895] [2020-08-22 00:44:06,292 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:44:06,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:07,201 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:44:07,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:07,206 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:44:07,206 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [405726895] [2020-08-22 00:44:07,207 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:44:07,207 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-22 00:44:07,207 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1958390125] [2020-08-22 00:44:07,207 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-22 00:44:07,207 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:44:07,208 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-22 00:44:07,208 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=1091, Unknown=0, NotChecked=0, Total=1190 [2020-08-22 00:44:07,208 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 35 states. [2020-08-22 00:44:07,940 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:44:07,940 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2020-08-22 00:44:07,941 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-22 00:44:07,941 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 42 [2020-08-22 00:44:07,941 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:44:07,942 INFO L225 Difference]: With dead ends: 49 [2020-08-22 00:44:07,942 INFO L226 Difference]: Without dead ends: 44 [2020-08-22 00:44:07,943 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=99, Invalid=1091, Unknown=0, NotChecked=0, Total=1190 [2020-08-22 00:44:07,943 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-22 00:44:07,946 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-08-22 00:44:07,946 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-22 00:44:07,946 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2020-08-22 00:44:07,947 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 42 [2020-08-22 00:44:07,947 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:44:07,947 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2020-08-22 00:44:07,947 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-22 00:44:07,947 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2020-08-22 00:44:07,948 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-22 00:44:07,948 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:44:07,948 INFO L422 BasicCegarLoop]: trace histogram [33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:44:07,948 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-22 00:44:07,948 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:44:07,948 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:44:07,949 INFO L82 PathProgramCache]: Analyzing trace with hash 686304593, now seen corresponding path program 33 times [2020-08-22 00:44:07,949 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:44:07,949 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2080759641] [2020-08-22 00:44:07,949 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:44:07,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:08,870 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:44:08,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:08,875 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:44:08,876 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2080759641] [2020-08-22 00:44:08,876 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:44:08,876 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-22 00:44:08,876 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [997226585] [2020-08-22 00:44:08,876 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-22 00:44:08,876 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:44:08,877 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-22 00:44:08,877 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=1158, Unknown=0, NotChecked=0, Total=1260 [2020-08-22 00:44:08,877 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 36 states. [2020-08-22 00:44:09,630 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:44:09,630 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2020-08-22 00:44:09,631 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-22 00:44:09,631 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 43 [2020-08-22 00:44:09,631 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:44:09,632 INFO L225 Difference]: With dead ends: 50 [2020-08-22 00:44:09,632 INFO L226 Difference]: Without dead ends: 45 [2020-08-22 00:44:09,632 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=102, Invalid=1158, Unknown=0, NotChecked=0, Total=1260 [2020-08-22 00:44:09,633 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-08-22 00:44:09,635 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2020-08-22 00:44:09,635 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-22 00:44:09,635 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2020-08-22 00:44:09,636 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 43 [2020-08-22 00:44:09,636 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:44:09,636 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2020-08-22 00:44:09,636 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-22 00:44:09,636 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2020-08-22 00:44:09,636 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-22 00:44:09,637 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:44:09,637 INFO L422 BasicCegarLoop]: trace histogram [34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:44:09,637 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-22 00:44:09,637 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:44:09,637 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:44:09,637 INFO L82 PathProgramCache]: Analyzing trace with hash -162932834, now seen corresponding path program 34 times [2020-08-22 00:44:09,638 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:44:09,638 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [257110265] [2020-08-22 00:44:09,638 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:44:09,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:10,638 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:44:10,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:10,644 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:44:10,644 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [257110265] [2020-08-22 00:44:10,645 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:44:10,645 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-22 00:44:10,645 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1567834025] [2020-08-22 00:44:10,645 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-22 00:44:10,645 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:44:10,646 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-22 00:44:10,646 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=1227, Unknown=0, NotChecked=0, Total=1332 [2020-08-22 00:44:10,646 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 37 states. [2020-08-22 00:44:11,451 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:44:11,451 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2020-08-22 00:44:11,452 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-22 00:44:11,452 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 44 [2020-08-22 00:44:11,452 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:44:11,453 INFO L225 Difference]: With dead ends: 51 [2020-08-22 00:44:11,453 INFO L226 Difference]: Without dead ends: 46 [2020-08-22 00:44:11,454 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=105, Invalid=1227, Unknown=0, NotChecked=0, Total=1332 [2020-08-22 00:44:11,454 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-22 00:44:11,466 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2020-08-22 00:44:11,466 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-22 00:44:11,470 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 46 transitions. [2020-08-22 00:44:11,470 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 46 transitions. Word has length 44 [2020-08-22 00:44:11,471 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:44:11,471 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 46 transitions. [2020-08-22 00:44:11,471 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-22 00:44:11,471 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 46 transitions. [2020-08-22 00:44:11,471 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-08-22 00:44:11,471 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:44:11,472 INFO L422 BasicCegarLoop]: trace histogram [35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:44:11,472 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-22 00:44:11,473 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:44:11,473 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:44:11,473 INFO L82 PathProgramCache]: Analyzing trace with hash -719489295, now seen corresponding path program 35 times [2020-08-22 00:44:11,473 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:44:11,473 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1671341975] [2020-08-22 00:44:11,473 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:44:11,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:12,530 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:44:12,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:12,535 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:44:12,535 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1671341975] [2020-08-22 00:44:12,535 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:44:12,536 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-22 00:44:12,536 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [463422675] [2020-08-22 00:44:12,536 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-22 00:44:12,536 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:44:12,537 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-22 00:44:12,537 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=1298, Unknown=0, NotChecked=0, Total=1406 [2020-08-22 00:44:12,537 INFO L87 Difference]: Start difference. First operand 46 states and 46 transitions. Second operand 38 states. [2020-08-22 00:44:13,351 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:44:13,352 INFO L93 Difference]: Finished difference Result 52 states and 52 transitions. [2020-08-22 00:44:13,352 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-22 00:44:13,352 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 45 [2020-08-22 00:44:13,353 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:44:13,353 INFO L225 Difference]: With dead ends: 52 [2020-08-22 00:44:13,353 INFO L226 Difference]: Without dead ends: 47 [2020-08-22 00:44:13,354 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=108, Invalid=1298, Unknown=0, NotChecked=0, Total=1406 [2020-08-22 00:44:13,355 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-22 00:44:13,358 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2020-08-22 00:44:13,358 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-22 00:44:13,358 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2020-08-22 00:44:13,359 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 45 [2020-08-22 00:44:13,359 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:44:13,359 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2020-08-22 00:44:13,359 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-22 00:44:13,359 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2020-08-22 00:44:13,360 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-22 00:44:13,360 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:44:13,360 INFO L422 BasicCegarLoop]: trace histogram [36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:44:13,360 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-22 00:44:13,360 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:44:13,361 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:44:13,361 INFO L82 PathProgramCache]: Analyzing trace with hash -792870402, now seen corresponding path program 36 times [2020-08-22 00:44:13,361 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:44:13,361 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1061264676] [2020-08-22 00:44:13,361 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:44:13,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:14,408 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:44:14,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:14,413 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:44:14,413 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1061264676] [2020-08-22 00:44:14,413 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:44:14,414 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-22 00:44:14,414 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1811784572] [2020-08-22 00:44:14,414 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-22 00:44:14,414 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:44:14,415 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-22 00:44:14,415 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=1371, Unknown=0, NotChecked=0, Total=1482 [2020-08-22 00:44:14,415 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 39 states. [2020-08-22 00:44:15,318 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:44:15,318 INFO L93 Difference]: Finished difference Result 53 states and 53 transitions. [2020-08-22 00:44:15,319 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-22 00:44:15,320 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 46 [2020-08-22 00:44:15,320 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:44:15,321 INFO L225 Difference]: With dead ends: 53 [2020-08-22 00:44:15,321 INFO L226 Difference]: Without dead ends: 48 [2020-08-22 00:44:15,322 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=111, Invalid=1371, Unknown=0, NotChecked=0, Total=1482 [2020-08-22 00:44:15,322 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-22 00:44:15,325 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-08-22 00:44:15,325 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-22 00:44:15,325 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 48 transitions. [2020-08-22 00:44:15,325 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 48 transitions. Word has length 46 [2020-08-22 00:44:15,326 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:44:15,326 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 48 transitions. [2020-08-22 00:44:15,326 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-22 00:44:15,326 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 48 transitions. [2020-08-22 00:44:15,326 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-08-22 00:44:15,326 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:44:15,327 INFO L422 BasicCegarLoop]: trace histogram [37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:44:15,327 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-22 00:44:15,327 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:44:15,327 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:44:15,327 INFO L82 PathProgramCache]: Analyzing trace with hash 1227282577, now seen corresponding path program 37 times [2020-08-22 00:44:15,328 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:44:15,328 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1201279084] [2020-08-22 00:44:15,328 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:44:15,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:16,421 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:44:16,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:16,427 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:44:16,428 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1201279084] [2020-08-22 00:44:16,428 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:44:16,428 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-22 00:44:16,428 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1648503754] [2020-08-22 00:44:16,429 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-22 00:44:16,429 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:44:16,429 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-22 00:44:16,430 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=1446, Unknown=0, NotChecked=0, Total=1560 [2020-08-22 00:44:16,430 INFO L87 Difference]: Start difference. First operand 48 states and 48 transitions. Second operand 40 states. [2020-08-22 00:44:17,366 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:44:17,367 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2020-08-22 00:44:17,367 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-22 00:44:17,367 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 47 [2020-08-22 00:44:17,368 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:44:17,368 INFO L225 Difference]: With dead ends: 54 [2020-08-22 00:44:17,368 INFO L226 Difference]: Without dead ends: 49 [2020-08-22 00:44:17,369 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=114, Invalid=1446, Unknown=0, NotChecked=0, Total=1560 [2020-08-22 00:44:17,370 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-22 00:44:17,373 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-22 00:44:17,373 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-22 00:44:17,373 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2020-08-22 00:44:17,373 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 47 [2020-08-22 00:44:17,374 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:44:17,374 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2020-08-22 00:44:17,374 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-22 00:44:17,374 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2020-08-22 00:44:17,374 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-22 00:44:17,375 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:44:17,375 INFO L422 BasicCegarLoop]: trace histogram [38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:44:17,375 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-22 00:44:17,375 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:44:17,375 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:44:17,375 INFO L82 PathProgramCache]: Analyzing trace with hash -572484514, now seen corresponding path program 38 times [2020-08-22 00:44:17,375 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:44:17,376 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1319215293] [2020-08-22 00:44:17,376 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:44:17,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:18,515 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:44:18,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:18,521 INFO L134 CoverageAnalysis]: Checked inductivity of 741 backedges. 0 proven. 741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:44:18,521 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1319215293] [2020-08-22 00:44:18,522 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:44:18,522 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-22 00:44:18,522 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [930253674] [2020-08-22 00:44:18,522 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-22 00:44:18,523 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:44:18,523 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-22 00:44:18,524 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=1523, Unknown=0, NotChecked=0, Total=1640 [2020-08-22 00:44:18,524 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand 41 states. [2020-08-22 00:44:19,507 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:44:19,507 INFO L93 Difference]: Finished difference Result 55 states and 55 transitions. [2020-08-22 00:44:19,507 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-22 00:44:19,508 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 48 [2020-08-22 00:44:19,508 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:44:19,509 INFO L225 Difference]: With dead ends: 55 [2020-08-22 00:44:19,509 INFO L226 Difference]: Without dead ends: 50 [2020-08-22 00:44:19,510 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=117, Invalid=1523, Unknown=0, NotChecked=0, Total=1640 [2020-08-22 00:44:19,510 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-08-22 00:44:19,513 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2020-08-22 00:44:19,514 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-08-22 00:44:19,514 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 50 transitions. [2020-08-22 00:44:19,514 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 50 transitions. Word has length 48 [2020-08-22 00:44:19,514 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:44:19,515 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 50 transitions. [2020-08-22 00:44:19,515 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-22 00:44:19,515 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 50 transitions. [2020-08-22 00:44:19,515 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-08-22 00:44:19,515 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:44:19,515 INFO L422 BasicCegarLoop]: trace histogram [39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:44:19,516 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-22 00:44:19,516 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:44:19,516 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:44:19,516 INFO L82 PathProgramCache]: Analyzing trace with hash -530689487, now seen corresponding path program 39 times [2020-08-22 00:44:19,516 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:44:19,516 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [220296561] [2020-08-22 00:44:19,516 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:44:19,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:20,751 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:44:20,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:20,761 INFO L134 CoverageAnalysis]: Checked inductivity of 780 backedges. 0 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:44:20,761 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [220296561] [2020-08-22 00:44:20,762 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:44:20,762 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-22 00:44:20,762 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1222039098] [2020-08-22 00:44:20,763 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-22 00:44:20,763 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:44:20,763 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-22 00:44:20,765 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=1602, Unknown=0, NotChecked=0, Total=1722 [2020-08-22 00:44:20,765 INFO L87 Difference]: Start difference. First operand 50 states and 50 transitions. Second operand 42 states. [2020-08-22 00:44:21,792 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:44:21,792 INFO L93 Difference]: Finished difference Result 56 states and 56 transitions. [2020-08-22 00:44:21,793 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-22 00:44:21,793 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 49 [2020-08-22 00:44:21,793 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:44:21,794 INFO L225 Difference]: With dead ends: 56 [2020-08-22 00:44:21,794 INFO L226 Difference]: Without dead ends: 51 [2020-08-22 00:44:21,795 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=120, Invalid=1602, Unknown=0, NotChecked=0, Total=1722 [2020-08-22 00:44:21,796 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-08-22 00:44:21,798 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2020-08-22 00:44:21,798 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-22 00:44:21,799 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2020-08-22 00:44:21,799 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 49 [2020-08-22 00:44:21,799 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:44:21,799 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2020-08-22 00:44:21,799 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-22 00:44:21,799 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2020-08-22 00:44:21,799 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-22 00:44:21,800 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:44:21,800 INFO L422 BasicCegarLoop]: trace histogram [40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:44:21,800 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-22 00:44:21,800 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:44:21,800 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:44:21,800 INFO L82 PathProgramCache]: Analyzing trace with hash 764956350, now seen corresponding path program 40 times [2020-08-22 00:44:21,800 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:44:21,800 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [764837542] [2020-08-22 00:44:21,801 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:44:21,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:23,077 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:44:23,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:23,083 INFO L134 CoverageAnalysis]: Checked inductivity of 820 backedges. 0 proven. 820 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:44:23,083 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [764837542] [2020-08-22 00:44:23,083 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:44:23,083 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-22 00:44:23,083 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [750470709] [2020-08-22 00:44:23,084 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-22 00:44:23,084 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:44:23,084 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-22 00:44:23,084 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=1683, Unknown=0, NotChecked=0, Total=1806 [2020-08-22 00:44:23,085 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 43 states. [2020-08-22 00:44:24,219 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:44:24,220 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2020-08-22 00:44:24,220 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-08-22 00:44:24,220 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 50 [2020-08-22 00:44:24,221 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:44:24,222 INFO L225 Difference]: With dead ends: 57 [2020-08-22 00:44:24,222 INFO L226 Difference]: Without dead ends: 52 [2020-08-22 00:44:24,223 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=123, Invalid=1683, Unknown=0, NotChecked=0, Total=1806 [2020-08-22 00:44:24,223 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-22 00:44:24,226 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2020-08-22 00:44:24,226 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-08-22 00:44:24,226 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 52 transitions. [2020-08-22 00:44:24,227 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 52 transitions. Word has length 50 [2020-08-22 00:44:24,227 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:44:24,227 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 52 transitions. [2020-08-22 00:44:24,227 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-22 00:44:24,227 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 52 transitions. [2020-08-22 00:44:24,227 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-08-22 00:44:24,227 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:44:24,228 INFO L422 BasicCegarLoop]: trace histogram [41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:44:24,228 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-22 00:44:24,228 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:44:24,228 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:44:24,228 INFO L82 PathProgramCache]: Analyzing trace with hash -2019695663, now seen corresponding path program 41 times [2020-08-22 00:44:24,228 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:44:24,228 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2052585403] [2020-08-22 00:44:24,228 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:44:24,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:25,551 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:44:25,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:25,557 INFO L134 CoverageAnalysis]: Checked inductivity of 861 backedges. 0 proven. 861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:44:25,557 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2052585403] [2020-08-22 00:44:25,557 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:44:25,557 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44] total 44 [2020-08-22 00:44:25,557 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [213995486] [2020-08-22 00:44:25,557 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-08-22 00:44:25,558 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:44:25,558 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-08-22 00:44:25,558 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=1766, Unknown=0, NotChecked=0, Total=1892 [2020-08-22 00:44:25,558 INFO L87 Difference]: Start difference. First operand 52 states and 52 transitions. Second operand 44 states. [2020-08-22 00:44:26,687 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:44:26,688 INFO L93 Difference]: Finished difference Result 58 states and 58 transitions. [2020-08-22 00:44:26,688 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-08-22 00:44:26,688 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 51 [2020-08-22 00:44:26,689 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:44:26,690 INFO L225 Difference]: With dead ends: 58 [2020-08-22 00:44:26,690 INFO L226 Difference]: Without dead ends: 53 [2020-08-22 00:44:26,691 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=126, Invalid=1766, Unknown=0, NotChecked=0, Total=1892 [2020-08-22 00:44:26,691 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-08-22 00:44:26,694 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2020-08-22 00:44:26,694 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-22 00:44:26,695 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2020-08-22 00:44:26,695 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 51 [2020-08-22 00:44:26,695 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:44:26,695 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2020-08-22 00:44:26,695 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-08-22 00:44:26,695 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2020-08-22 00:44:26,696 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-22 00:44:26,696 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:44:26,696 INFO L422 BasicCegarLoop]: trace histogram [42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:44:26,696 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-08-22 00:44:26,696 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:44:26,697 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:44:26,697 INFO L82 PathProgramCache]: Analyzing trace with hash 1850405150, now seen corresponding path program 42 times [2020-08-22 00:44:26,697 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:44:26,697 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [892585277] [2020-08-22 00:44:26,697 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:44:26,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:28,081 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:44:28,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:28,087 INFO L134 CoverageAnalysis]: Checked inductivity of 903 backedges. 0 proven. 903 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:44:28,088 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [892585277] [2020-08-22 00:44:28,088 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:44:28,088 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45] total 45 [2020-08-22 00:44:28,088 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [458842641] [2020-08-22 00:44:28,089 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2020-08-22 00:44:28,089 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:44:28,089 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2020-08-22 00:44:28,090 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=1851, Unknown=0, NotChecked=0, Total=1980 [2020-08-22 00:44:28,090 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 45 states. [2020-08-22 00:44:29,315 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:44:29,315 INFO L93 Difference]: Finished difference Result 59 states and 59 transitions. [2020-08-22 00:44:29,316 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2020-08-22 00:44:29,316 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 52 [2020-08-22 00:44:29,316 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:44:29,317 INFO L225 Difference]: With dead ends: 59 [2020-08-22 00:44:29,317 INFO L226 Difference]: Without dead ends: 54 [2020-08-22 00:44:29,318 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=129, Invalid=1851, Unknown=0, NotChecked=0, Total=1980 [2020-08-22 00:44:29,318 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-22 00:44:29,320 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2020-08-22 00:44:29,320 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-08-22 00:44:29,321 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 54 transitions. [2020-08-22 00:44:29,321 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 54 transitions. Word has length 52 [2020-08-22 00:44:29,321 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:44:29,321 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 54 transitions. [2020-08-22 00:44:29,321 INFO L480 AbstractCegarLoop]: Interpolant automaton has 45 states. [2020-08-22 00:44:29,322 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 54 transitions. [2020-08-22 00:44:29,322 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-08-22 00:44:29,322 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:44:29,322 INFO L422 BasicCegarLoop]: trace histogram [43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:44:29,322 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2020-08-22 00:44:29,322 INFO L427 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:44:29,323 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:44:29,323 INFO L82 PathProgramCache]: Analyzing trace with hash 1564446065, now seen corresponding path program 43 times [2020-08-22 00:44:29,323 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:44:29,323 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [365309440] [2020-08-22 00:44:29,323 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:44:29,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:30,800 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:44:30,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:30,806 INFO L134 CoverageAnalysis]: Checked inductivity of 946 backedges. 0 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:44:30,806 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [365309440] [2020-08-22 00:44:30,806 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:44:30,806 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46] total 46 [2020-08-22 00:44:30,807 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1490724047] [2020-08-22 00:44:30,807 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2020-08-22 00:44:30,807 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:44:30,807 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2020-08-22 00:44:30,808 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=1938, Unknown=0, NotChecked=0, Total=2070 [2020-08-22 00:44:30,808 INFO L87 Difference]: Start difference. First operand 54 states and 54 transitions. Second operand 46 states. [2020-08-22 00:44:32,046 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:44:32,047 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2020-08-22 00:44:32,047 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2020-08-22 00:44:32,047 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 53 [2020-08-22 00:44:32,048 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:44:32,048 INFO L225 Difference]: With dead ends: 60 [2020-08-22 00:44:32,048 INFO L226 Difference]: Without dead ends: 55 [2020-08-22 00:44:32,049 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=132, Invalid=1938, Unknown=0, NotChecked=0, Total=2070 [2020-08-22 00:44:32,049 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-08-22 00:44:32,053 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2020-08-22 00:44:32,053 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-22 00:44:32,053 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2020-08-22 00:44:32,053 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 53 [2020-08-22 00:44:32,053 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:44:32,053 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2020-08-22 00:44:32,054 INFO L480 AbstractCegarLoop]: Interpolant automaton has 46 states. [2020-08-22 00:44:32,054 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2020-08-22 00:44:32,054 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-22 00:44:32,054 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:44:32,054 INFO L422 BasicCegarLoop]: trace histogram [44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:44:32,054 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2020-08-22 00:44:32,054 INFO L427 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:44:32,054 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:44:32,055 INFO L82 PathProgramCache]: Analyzing trace with hash 1289649022, now seen corresponding path program 44 times [2020-08-22 00:44:32,055 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:44:32,055 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1834652074] [2020-08-22 00:44:32,055 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:44:32,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:33,521 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:44:33,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:33,527 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 990 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:44:33,528 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1834652074] [2020-08-22 00:44:33,528 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:44:33,528 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47] total 47 [2020-08-22 00:44:33,528 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [934648568] [2020-08-22 00:44:33,528 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2020-08-22 00:44:33,528 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:44:33,529 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2020-08-22 00:44:33,529 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=2027, Unknown=0, NotChecked=0, Total=2162 [2020-08-22 00:44:33,529 INFO L87 Difference]: Start difference. First operand 55 states and 55 transitions. Second operand 47 states. [2020-08-22 00:44:34,854 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:44:34,855 INFO L93 Difference]: Finished difference Result 61 states and 61 transitions. [2020-08-22 00:44:34,855 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2020-08-22 00:44:34,856 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 54 [2020-08-22 00:44:34,856 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:44:34,857 INFO L225 Difference]: With dead ends: 61 [2020-08-22 00:44:34,857 INFO L226 Difference]: Without dead ends: 56 [2020-08-22 00:44:34,858 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=135, Invalid=2027, Unknown=0, NotChecked=0, Total=2162 [2020-08-22 00:44:34,858 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-08-22 00:44:34,861 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2020-08-22 00:44:34,862 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-08-22 00:44:34,862 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 56 transitions. [2020-08-22 00:44:34,862 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 56 transitions. Word has length 54 [2020-08-22 00:44:34,863 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:44:34,863 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 56 transitions. [2020-08-22 00:44:34,863 INFO L480 AbstractCegarLoop]: Interpolant automaton has 47 states. [2020-08-22 00:44:34,863 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 56 transitions. [2020-08-22 00:44:34,863 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-08-22 00:44:34,864 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:44:34,864 INFO L422 BasicCegarLoop]: trace histogram [45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:44:34,864 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2020-08-22 00:44:34,864 INFO L427 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:44:34,864 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:44:34,864 INFO L82 PathProgramCache]: Analyzing trace with hash 1360875281, now seen corresponding path program 45 times [2020-08-22 00:44:34,865 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:44:34,865 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [447514184] [2020-08-22 00:44:34,865 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:44:34,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:36,388 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:44:36,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:36,394 INFO L134 CoverageAnalysis]: Checked inductivity of 1035 backedges. 0 proven. 1035 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:44:36,394 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [447514184] [2020-08-22 00:44:36,394 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:44:36,394 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48] total 48 [2020-08-22 00:44:36,394 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [840071691] [2020-08-22 00:44:36,395 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-08-22 00:44:36,395 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:44:36,395 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-08-22 00:44:36,395 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=2118, Unknown=0, NotChecked=0, Total=2256 [2020-08-22 00:44:36,395 INFO L87 Difference]: Start difference. First operand 56 states and 56 transitions. Second operand 48 states. [2020-08-22 00:44:37,794 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:44:37,795 INFO L93 Difference]: Finished difference Result 62 states and 62 transitions. [2020-08-22 00:44:37,795 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-08-22 00:44:37,796 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 55 [2020-08-22 00:44:37,796 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:44:37,797 INFO L225 Difference]: With dead ends: 62 [2020-08-22 00:44:37,797 INFO L226 Difference]: Without dead ends: 57 [2020-08-22 00:44:37,797 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=138, Invalid=2118, Unknown=0, NotChecked=0, Total=2256 [2020-08-22 00:44:37,798 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-08-22 00:44:37,801 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2020-08-22 00:44:37,801 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-22 00:44:37,801 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2020-08-22 00:44:37,801 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 55 [2020-08-22 00:44:37,802 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:44:37,802 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2020-08-22 00:44:37,802 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-08-22 00:44:37,802 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2020-08-22 00:44:37,802 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-22 00:44:37,803 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:44:37,803 INFO L422 BasicCegarLoop]: trace histogram [46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:44:37,803 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2020-08-22 00:44:37,803 INFO L427 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:44:37,803 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:44:37,803 INFO L82 PathProgramCache]: Analyzing trace with hash -726077986, now seen corresponding path program 46 times [2020-08-22 00:44:37,804 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:44:37,804 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [886968673] [2020-08-22 00:44:37,804 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:44:37,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:39,382 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:44:39,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:39,389 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:44:39,389 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [886968673] [2020-08-22 00:44:39,389 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:44:39,390 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49] total 49 [2020-08-22 00:44:39,390 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1244089441] [2020-08-22 00:44:39,390 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2020-08-22 00:44:39,390 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:44:39,390 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2020-08-22 00:44:39,391 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=2211, Unknown=0, NotChecked=0, Total=2352 [2020-08-22 00:44:39,391 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 49 states. [2020-08-22 00:44:40,842 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:44:40,842 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2020-08-22 00:44:40,843 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2020-08-22 00:44:40,843 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 56 [2020-08-22 00:44:40,844 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:44:40,844 INFO L225 Difference]: With dead ends: 63 [2020-08-22 00:44:40,844 INFO L226 Difference]: Without dead ends: 58 [2020-08-22 00:44:40,845 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=141, Invalid=2211, Unknown=0, NotChecked=0, Total=2352 [2020-08-22 00:44:40,845 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-22 00:44:40,848 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2020-08-22 00:44:40,848 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-08-22 00:44:40,848 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 58 transitions. [2020-08-22 00:44:40,848 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 58 transitions. Word has length 56 [2020-08-22 00:44:40,849 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:44:40,849 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 58 transitions. [2020-08-22 00:44:40,849 INFO L480 AbstractCegarLoop]: Interpolant automaton has 49 states. [2020-08-22 00:44:40,849 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 58 transitions. [2020-08-22 00:44:40,849 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-08-22 00:44:40,849 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:44:40,849 INFO L422 BasicCegarLoop]: trace histogram [47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:44:40,850 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2020-08-22 00:44:40,850 INFO L427 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:44:40,850 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:44:40,850 INFO L82 PathProgramCache]: Analyzing trace with hash -997119823, now seen corresponding path program 47 times [2020-08-22 00:44:40,850 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:44:40,850 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2129737233] [2020-08-22 00:44:40,850 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:44:40,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:42,509 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:44:42,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:42,520 INFO L134 CoverageAnalysis]: Checked inductivity of 1128 backedges. 0 proven. 1128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:44:42,521 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2129737233] [2020-08-22 00:44:42,524 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:44:42,525 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50] total 50 [2020-08-22 00:44:42,526 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1625914652] [2020-08-22 00:44:42,527 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-08-22 00:44:42,527 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:44:42,527 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-08-22 00:44:42,528 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=144, Invalid=2306, Unknown=0, NotChecked=0, Total=2450 [2020-08-22 00:44:42,528 INFO L87 Difference]: Start difference. First operand 58 states and 58 transitions. Second operand 50 states.