/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=5 --traceabstraction.additional.smt.options interpolation-heuristic=SMALLESTAMONGWIDE --traceabstraction.additional.smt.options tolerance=0.5 -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 0.1.25-5644d1e-m [2020-08-19 06:56:22,927 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-19 06:56:22,929 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-19 06:56:22,968 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-19 06:56:22,968 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-19 06:56:22,980 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-19 06:56:22,981 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-19 06:56:22,984 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-19 06:56:22,987 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-19 06:56:22,989 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-19 06:56:22,990 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-19 06:56:22,993 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-19 06:56:22,994 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-19 06:56:22,996 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-19 06:56:22,998 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-19 06:56:23,000 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-19 06:56:23,001 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-19 06:56:23,002 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-19 06:56:23,004 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-19 06:56:23,011 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-19 06:56:23,012 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-19 06:56:23,014 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-19 06:56:23,015 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-19 06:56:23,016 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-19 06:56:23,019 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-19 06:56:23,030 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-19 06:56:23,031 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-19 06:56:23,032 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-19 06:56:23,033 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 [2020-08-19 06:56:23,075 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-19 06:56:23,076 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-19 06:56:23,078 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-19 06:56:23,078 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-19 06:56:23,078 INFO L138 SettingsManager]: * Use SBE=true [2020-08-19 06:56:23,078 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-19 06:56:23,079 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-19 06:56:23,079 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-19 06:56:23,079 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-19 06:56:23,079 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-19 06:56:23,080 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-19 06:56:23,081 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-19 06:56:23,081 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-19 06:56:23,081 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-19 06:56:23,081 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-19 06:56:23,082 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-19 06:56:23,082 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-19 06:56:23,082 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-19 06:56:23,082 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-19 06:56:23,082 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-19 06:56:23,083 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-19 06:56:23,083 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-19 06:56:23,083 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-19 06:56:23,083 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-19 06:56:23,083 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-19 06:56:23,084 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-19 06:56:23,084 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-19 06:56:23,084 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-19 06:56:23,084 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-19 06:56:23,084 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=5;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.5; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.5; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.5; [2020-08-19 06:56:23,365 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-19 06:56:23,377 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-19 06:56:23,380 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-19 06:56:23,382 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-19 06:56:23,382 INFO L275 PluginConnector]: CDTParser initialized [2020-08-19 06:56:23,383 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/simple_4-2.c [2020-08-19 06:56:23,448 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/aff1aa7ba/741c8e609fe944399d7b95fcd305a792/FLAG34b83ca63 [2020-08-19 06:56:23,874 INFO L306 CDTParser]: Found 1 translation units. [2020-08-19 06:56:23,875 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-acceleration/simple_4-2.c [2020-08-19 06:56:23,881 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/aff1aa7ba/741c8e609fe944399d7b95fcd305a792/FLAG34b83ca63 [2020-08-19 06:56:24,255 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/aff1aa7ba/741c8e609fe944399d7b95fcd305a792 [2020-08-19 06:56:24,265 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-19 06:56:24,267 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-19 06:56:24,268 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-19 06:56:24,268 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-19 06:56:24,271 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-19 06:56:24,272 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 06:56:24" (1/1) ... [2020-08-19 06:56:24,275 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@530cd126 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:56:24, skipping insertion in model container [2020-08-19 06:56:24,275 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 06:56:24" (1/1) ... [2020-08-19 06:56:24,283 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-19 06:56:24,300 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-19 06:56:24,459 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-19 06:56:24,464 INFO L203 MainTranslator]: Completed pre-run [2020-08-19 06:56:24,477 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-19 06:56:24,489 INFO L208 MainTranslator]: Completed translation [2020-08-19 06:56:24,489 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:56:24 WrapperNode [2020-08-19 06:56:24,489 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-19 06:56:24,490 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-19 06:56:24,490 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-19 06:56:24,490 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-19 06:56:24,499 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:56:24" (1/1) ... [2020-08-19 06:56:24,500 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:56:24" (1/1) ... [2020-08-19 06:56:24,504 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:56:24" (1/1) ... [2020-08-19 06:56:24,504 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:56:24" (1/1) ... [2020-08-19 06:56:24,584 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:56:24" (1/1) ... [2020-08-19 06:56:24,589 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:56:24" (1/1) ... [2020-08-19 06:56:24,590 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:56:24" (1/1) ... [2020-08-19 06:56:24,591 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-19 06:56:24,591 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-19 06:56:24,591 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-19 06:56:24,592 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-19 06:56:24,592 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:56:24" (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 [2020-08-19 06:56:24,648 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-19 06:56:24,649 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-19 06:56:24,649 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-19 06:56:24,649 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-19 06:56:24,649 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-19 06:56:24,649 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-19 06:56:24,649 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-19 06:56:24,650 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-19 06:56:24,650 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-19 06:56:24,804 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-19 06:56:24,805 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-19 06:56:24,808 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 06:56:24 BoogieIcfgContainer [2020-08-19 06:56:24,808 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-19 06:56:24,810 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-19 06:56:24,810 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-19 06:56:24,813 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-19 06:56:24,814 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.08 06:56:24" (1/3) ... [2020-08-19 06:56:24,815 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5b7d7009 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 06:56:24, skipping insertion in model container [2020-08-19 06:56:24,815 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:56:24" (2/3) ... [2020-08-19 06:56:24,815 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5b7d7009 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 06:56:24, skipping insertion in model container [2020-08-19 06:56:24,815 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 06:56:24" (3/3) ... [2020-08-19 06:56:24,817 INFO L109 eAbstractionObserver]: Analyzing ICFG simple_4-2.c [2020-08-19 06:56:24,827 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-19 06:56:24,833 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-19 06:56:24,844 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-19 06:56:24,867 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-19 06:56:24,867 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-19 06:56:24,867 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-19 06:56:24,868 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-19 06:56:24,868 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-19 06:56:24,868 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-19 06:56:24,868 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-19 06:56:24,868 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-19 06:56:24,885 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2020-08-19 06:56:24,891 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-19 06:56:24,891 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:24,894 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:24,894 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:24,900 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:24,901 INFO L82 PathProgramCache]: Analyzing trace with hash 1846144830, now seen corresponding path program 1 times [2020-08-19 06:56:24,909 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:24,909 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1911075163] [2020-08-19 06:56:24,910 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:25,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:25,103 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:25,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:25,122 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:56:25,123 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1911075163] [2020-08-19 06:56:25,126 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 06:56:25,127 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-19 06:56:25,128 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [217774883] [2020-08-19 06:56:25,136 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-19 06:56:25,137 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:25,181 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-19 06:56:25,182 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-19 06:56:25,184 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 3 states. [2020-08-19 06:56:25,217 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:56:25,217 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2020-08-19 06:56:25,218 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-19 06:56:25,220 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-08-19 06:56:25,220 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:56:25,228 INFO L225 Difference]: With dead ends: 29 [2020-08-19 06:56:25,228 INFO L226 Difference]: Without dead ends: 12 [2020-08-19 06:56:25,231 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 [2020-08-19 06:56:25,246 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2020-08-19 06:56:25,259 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2020-08-19 06:56:25,261 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2020-08-19 06:56:25,262 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2020-08-19 06:56:25,263 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2020-08-19 06:56:25,263 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:56:25,264 INFO L479 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2020-08-19 06:56:25,264 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-19 06:56:25,264 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2020-08-19 06:56:25,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-08-19 06:56:25,265 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:25,265 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:25,265 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-19 06:56:25,266 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:25,266 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:25,267 INFO L82 PathProgramCache]: Analyzing trace with hash 1432376145, now seen corresponding path program 1 times [2020-08-19 06:56:25,267 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:25,267 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [447543008] [2020-08-19 06:56:25,268 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:25,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:25,396 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:25,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:25,400 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:56:25,401 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [447543008] [2020-08-19 06:56:25,401 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:56:25,401 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2020-08-19 06:56:25,402 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [172212566] [2020-08-19 06:56:25,403 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-19 06:56:25,404 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:25,404 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-19 06:56:25,405 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-19 06:56:25,405 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 4 states. [2020-08-19 06:56:25,439 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:56:25,439 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2020-08-19 06:56:25,440 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-19 06:56:25,441 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 11 [2020-08-19 06:56:25,441 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:56:25,442 INFO L225 Difference]: With dead ends: 18 [2020-08-19 06:56:25,442 INFO L226 Difference]: Without dead ends: 13 [2020-08-19 06:56:25,443 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 [2020-08-19 06:56:25,444 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-08-19 06:56:25,447 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-08-19 06:56:25,448 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-08-19 06:56:25,448 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2020-08-19 06:56:25,449 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 11 [2020-08-19 06:56:25,449 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:56:25,449 INFO L479 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2020-08-19 06:56:25,449 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-19 06:56:25,449 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2020-08-19 06:56:25,450 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-19 06:56:25,450 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:25,450 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:25,450 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-19 06:56:25,451 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:25,451 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:25,451 INFO L82 PathProgramCache]: Analyzing trace with hash 1490448798, now seen corresponding path program 2 times [2020-08-19 06:56:25,452 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:25,452 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [763818463] [2020-08-19 06:56:25,452 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:25,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:25,558 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:25,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:25,563 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:56:25,563 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [763818463] [2020-08-19 06:56:25,564 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:56:25,564 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-19 06:56:25,564 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [321569898] [2020-08-19 06:56:25,565 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-19 06:56:25,565 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:25,565 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-19 06:56:25,566 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-19 06:56:25,566 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 5 states. [2020-08-19 06:56:25,588 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:56:25,588 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2020-08-19 06:56:25,589 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-19 06:56:25,589 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 12 [2020-08-19 06:56:25,589 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:56:25,590 INFO L225 Difference]: With dead ends: 19 [2020-08-19 06:56:25,590 INFO L226 Difference]: Without dead ends: 14 [2020-08-19 06:56:25,591 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 [2020-08-19 06:56:25,591 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-08-19 06:56:25,595 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-08-19 06:56:25,595 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-08-19 06:56:25,596 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2020-08-19 06:56:25,596 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2020-08-19 06:56:25,596 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:56:25,596 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2020-08-19 06:56:25,597 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-19 06:56:25,597 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2020-08-19 06:56:25,597 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-19 06:56:25,597 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:25,597 INFO L422 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:25,598 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-19 06:56:25,598 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:25,598 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:25,598 INFO L82 PathProgramCache]: Analyzing trace with hash -1004266255, now seen corresponding path program 3 times [2020-08-19 06:56:25,599 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:25,599 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [698476484] [2020-08-19 06:56:25,599 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:25,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:25,712 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:25,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:25,716 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:56:25,716 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [698476484] [2020-08-19 06:56:25,717 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:56:25,717 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-19 06:56:25,717 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [984385056] [2020-08-19 06:56:25,718 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-19 06:56:25,718 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:25,718 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-19 06:56:25,719 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-19 06:56:25,719 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 6 states. [2020-08-19 06:56:25,747 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:56:25,748 INFO L93 Difference]: Finished difference Result 20 states and 20 transitions. [2020-08-19 06:56:25,748 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-19 06:56:25,748 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 13 [2020-08-19 06:56:25,749 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:56:25,749 INFO L225 Difference]: With dead ends: 20 [2020-08-19 06:56:25,749 INFO L226 Difference]: Without dead ends: 15 [2020-08-19 06:56:25,750 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 [2020-08-19 06:56:25,751 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-19 06:56:25,755 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-19 06:56:25,755 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-19 06:56:25,756 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2020-08-19 06:56:25,756 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 13 [2020-08-19 06:56:25,756 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:56:25,756 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2020-08-19 06:56:25,757 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-19 06:56:25,757 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2020-08-19 06:56:25,757 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-08-19 06:56:25,757 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:25,758 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:25,758 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-19 06:56:25,758 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:25,758 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:25,759 INFO L82 PathProgramCache]: Analyzing trace with hash -1031021570, now seen corresponding path program 4 times [2020-08-19 06:56:25,759 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:25,759 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1755058132] [2020-08-19 06:56:25,759 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:25,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:25,863 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:25,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:25,866 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:56:25,867 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1755058132] [2020-08-19 06:56:25,867 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:56:25,867 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-19 06:56:25,868 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1831693892] [2020-08-19 06:56:25,868 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-19 06:56:25,868 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:25,869 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-19 06:56:25,869 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-08-19 06:56:25,869 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 7 states. [2020-08-19 06:56:25,907 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:56:25,907 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2020-08-19 06:56:25,908 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-19 06:56:25,908 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 14 [2020-08-19 06:56:25,908 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:56:25,909 INFO L225 Difference]: With dead ends: 21 [2020-08-19 06:56:25,909 INFO L226 Difference]: Without dead ends: 16 [2020-08-19 06:56:25,910 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 [2020-08-19 06:56:25,910 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-19 06:56:25,914 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-08-19 06:56:25,915 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-19 06:56:25,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2020-08-19 06:56:25,916 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 14 [2020-08-19 06:56:25,916 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:56:25,916 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2020-08-19 06:56:25,917 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-19 06:56:25,917 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2020-08-19 06:56:25,917 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-19 06:56:25,917 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:25,918 INFO L422 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:25,918 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-19 06:56:25,918 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:25,918 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:25,919 INFO L82 PathProgramCache]: Analyzing trace with hash -1860436335, now seen corresponding path program 5 times [2020-08-19 06:56:25,919 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:25,919 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [241152367] [2020-08-19 06:56:25,920 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:25,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:26,081 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:26,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:26,086 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:56:26,090 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [241152367] [2020-08-19 06:56:26,090 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:56:26,090 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-19 06:56:26,091 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [353546961] [2020-08-19 06:56:26,091 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-19 06:56:26,091 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:26,092 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-19 06:56:26,092 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-08-19 06:56:26,092 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 8 states. [2020-08-19 06:56:26,163 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:56:26,164 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2020-08-19 06:56:26,165 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-19 06:56:26,165 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 15 [2020-08-19 06:56:26,165 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:56:26,169 INFO L225 Difference]: With dead ends: 22 [2020-08-19 06:56:26,169 INFO L226 Difference]: Without dead ends: 17 [2020-08-19 06:56:26,170 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-08-19 06:56:26,170 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-19 06:56:26,178 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-19 06:56:26,178 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-19 06:56:26,181 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-08-19 06:56:26,181 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 15 [2020-08-19 06:56:26,181 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:56:26,181 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-08-19 06:56:26,181 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-19 06:56:26,185 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-08-19 06:56:26,185 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-19 06:56:26,185 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:26,186 INFO L422 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:26,186 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-19 06:56:26,186 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:26,186 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:26,187 INFO L82 PathProgramCache]: Analyzing trace with hash -1802490274, now seen corresponding path program 6 times [2020-08-19 06:56:26,190 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:26,190 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1180018752] [2020-08-19 06:56:26,191 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:26,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:26,366 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:26,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:26,369 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:56:26,369 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1180018752] [2020-08-19 06:56:26,370 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:56:26,370 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-19 06:56:26,370 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1607035098] [2020-08-19 06:56:26,371 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-19 06:56:26,371 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:26,371 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-19 06:56:26,372 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-19 06:56:26,372 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 9 states. [2020-08-19 06:56:26,423 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:56:26,423 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2020-08-19 06:56:26,424 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-19 06:56:26,424 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 16 [2020-08-19 06:56:26,424 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:56:26,425 INFO L225 Difference]: With dead ends: 23 [2020-08-19 06:56:26,425 INFO L226 Difference]: Without dead ends: 18 [2020-08-19 06:56:26,425 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 [2020-08-19 06:56:26,426 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-08-19 06:56:26,429 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-08-19 06:56:26,429 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-19 06:56:26,430 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2020-08-19 06:56:26,430 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 16 [2020-08-19 06:56:26,431 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:56:26,431 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2020-08-19 06:56:26,431 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-19 06:56:26,431 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2020-08-19 06:56:26,432 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-19 06:56:26,432 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:26,432 INFO L422 BasicCegarLoop]: trace histogram [7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:26,432 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-19 06:56:26,432 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:26,433 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:26,433 INFO L82 PathProgramCache]: Analyzing trace with hash -6162383, now seen corresponding path program 7 times [2020-08-19 06:56:26,433 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:26,433 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [926447127] [2020-08-19 06:56:26,434 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:26,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:26,571 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:26,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:26,574 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:56:26,574 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [926447127] [2020-08-19 06:56:26,574 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:56:26,575 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-19 06:56:26,575 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1384904747] [2020-08-19 06:56:26,575 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-19 06:56:26,576 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:26,576 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-19 06:56:26,576 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2020-08-19 06:56:26,576 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 10 states. [2020-08-19 06:56:26,640 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:56:26,640 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2020-08-19 06:56:26,641 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-19 06:56:26,641 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 17 [2020-08-19 06:56:26,641 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:56:26,642 INFO L225 Difference]: With dead ends: 24 [2020-08-19 06:56:26,642 INFO L226 Difference]: Without dead ends: 19 [2020-08-19 06:56:26,642 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 [2020-08-19 06:56:26,643 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-08-19 06:56:26,647 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-08-19 06:56:26,647 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-08-19 06:56:26,648 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2020-08-19 06:56:26,648 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 17 [2020-08-19 06:56:26,648 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:56:26,649 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2020-08-19 06:56:26,649 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-19 06:56:26,649 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2020-08-19 06:56:26,649 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-19 06:56:26,649 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:26,650 INFO L422 BasicCegarLoop]: trace histogram [8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:26,650 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-19 06:56:26,650 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:26,650 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:26,651 INFO L82 PathProgramCache]: Analyzing trace with hash -154572610, now seen corresponding path program 8 times [2020-08-19 06:56:26,651 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:26,651 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [31288710] [2020-08-19 06:56:26,651 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:26,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:26,798 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:26,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:26,801 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:56:26,802 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [31288710] [2020-08-19 06:56:26,802 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:56:26,802 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-19 06:56:26,803 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1442777954] [2020-08-19 06:56:26,803 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-19 06:56:26,803 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:26,803 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-19 06:56:26,804 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-08-19 06:56:26,804 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 11 states. [2020-08-19 06:56:26,877 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:56:26,877 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2020-08-19 06:56:26,878 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-19 06:56:26,878 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 18 [2020-08-19 06:56:26,878 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:56:26,879 INFO L225 Difference]: With dead ends: 25 [2020-08-19 06:56:26,879 INFO L226 Difference]: Without dead ends: 20 [2020-08-19 06:56:26,880 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 [2020-08-19 06:56:26,880 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-19 06:56:26,884 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-19 06:56:26,884 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-19 06:56:26,885 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2020-08-19 06:56:26,885 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 18 [2020-08-19 06:56:26,885 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:56:26,885 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2020-08-19 06:56:26,885 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-19 06:56:26,886 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2020-08-19 06:56:26,886 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-19 06:56:26,886 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:26,886 INFO L422 BasicCegarLoop]: trace histogram [9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:26,887 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-19 06:56:26,887 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:26,887 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:26,887 INFO L82 PathProgramCache]: Analyzing trace with hash -460322351, now seen corresponding path program 9 times [2020-08-19 06:56:26,888 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:26,888 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [781231634] [2020-08-19 06:56:26,888 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:26,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:27,081 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:27,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:27,084 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:56:27,086 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [781231634] [2020-08-19 06:56:27,086 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:56:27,087 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-19 06:56:27,087 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [83741232] [2020-08-19 06:56:27,088 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-19 06:56:27,088 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:27,089 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-19 06:56:27,089 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-08-19 06:56:27,089 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 12 states. [2020-08-19 06:56:27,204 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:56:27,205 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2020-08-19 06:56:27,205 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-19 06:56:27,206 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 19 [2020-08-19 06:56:27,206 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:56:27,206 INFO L225 Difference]: With dead ends: 26 [2020-08-19 06:56:27,206 INFO L226 Difference]: Without dead ends: 21 [2020-08-19 06:56:27,207 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 [2020-08-19 06:56:27,207 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-19 06:56:27,212 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-08-19 06:56:27,212 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-19 06:56:27,214 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2020-08-19 06:56:27,214 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 19 [2020-08-19 06:56:27,215 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:56:27,215 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2020-08-19 06:56:27,215 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-19 06:56:27,215 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2020-08-19 06:56:27,216 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-19 06:56:27,216 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:27,216 INFO L422 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:27,216 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-19 06:56:27,217 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:27,217 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:27,217 INFO L82 PathProgramCache]: Analyzing trace with hash -1348629730, now seen corresponding path program 10 times [2020-08-19 06:56:27,217 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:27,218 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1478637359] [2020-08-19 06:56:27,218 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:27,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:27,452 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:27,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:27,455 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:56:27,456 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1478637359] [2020-08-19 06:56:27,457 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:56:27,457 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-19 06:56:27,457 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1817327427] [2020-08-19 06:56:27,458 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-19 06:56:27,458 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:27,458 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-19 06:56:27,459 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2020-08-19 06:56:27,459 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 13 states. [2020-08-19 06:56:27,573 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:56:27,574 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2020-08-19 06:56:27,576 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-19 06:56:27,577 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 20 [2020-08-19 06:56:27,577 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:56:27,578 INFO L225 Difference]: With dead ends: 27 [2020-08-19 06:56:27,578 INFO L226 Difference]: Without dead ends: 22 [2020-08-19 06:56:27,578 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 [2020-08-19 06:56:27,579 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-19 06:56:27,587 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2020-08-19 06:56:27,587 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-08-19 06:56:27,589 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2020-08-19 06:56:27,589 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 20 [2020-08-19 06:56:27,590 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:56:27,590 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2020-08-19 06:56:27,590 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-19 06:56:27,590 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2020-08-19 06:56:27,592 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-08-19 06:56:27,592 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:27,592 INFO L422 BasicCegarLoop]: trace histogram [11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:27,592 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-19 06:56:27,593 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:27,593 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:27,593 INFO L82 PathProgramCache]: Analyzing trace with hash 1178612593, now seen corresponding path program 11 times [2020-08-19 06:56:27,594 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:27,594 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [851752742] [2020-08-19 06:56:27,595 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:27,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:27,836 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:27,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:27,841 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:56:27,842 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [851752742] [2020-08-19 06:56:27,842 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:56:27,843 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-19 06:56:27,843 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1754565728] [2020-08-19 06:56:27,843 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-19 06:56:27,844 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:27,844 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-19 06:56:27,844 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2020-08-19 06:56:27,844 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 14 states. [2020-08-19 06:56:27,958 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:56:27,958 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2020-08-19 06:56:27,959 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-19 06:56:27,959 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 21 [2020-08-19 06:56:27,960 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:56:27,960 INFO L225 Difference]: With dead ends: 28 [2020-08-19 06:56:27,960 INFO L226 Difference]: Without dead ends: 23 [2020-08-19 06:56:27,961 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 [2020-08-19 06:56:27,961 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-19 06:56:27,966 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-08-19 06:56:27,966 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-19 06:56:27,970 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2020-08-19 06:56:27,970 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 21 [2020-08-19 06:56:27,971 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:56:27,971 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2020-08-19 06:56:27,971 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-19 06:56:27,971 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2020-08-19 06:56:27,972 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-19 06:56:27,972 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:27,972 INFO L422 BasicCegarLoop]: trace histogram [12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:27,972 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-19 06:56:27,972 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:27,973 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:27,973 INFO L82 PathProgramCache]: Analyzing trace with hash -2081254018, now seen corresponding path program 12 times [2020-08-19 06:56:27,973 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:27,973 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1890292465] [2020-08-19 06:56:27,973 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:27,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:28,205 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:28,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:28,209 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:56:28,210 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1890292465] [2020-08-19 06:56:28,212 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:56:28,213 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-19 06:56:28,213 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [553795536] [2020-08-19 06:56:28,213 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-19 06:56:28,213 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:28,214 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-19 06:56:28,214 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2020-08-19 06:56:28,214 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 15 states. [2020-08-19 06:56:28,340 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:56:28,341 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2020-08-19 06:56:28,343 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-19 06:56:28,343 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 22 [2020-08-19 06:56:28,343 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:56:28,343 INFO L225 Difference]: With dead ends: 29 [2020-08-19 06:56:28,344 INFO L226 Difference]: Without dead ends: 24 [2020-08-19 06:56:28,344 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 [2020-08-19 06:56:28,344 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-19 06:56:28,348 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-08-19 06:56:28,348 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-19 06:56:28,349 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2020-08-19 06:56:28,349 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 22 [2020-08-19 06:56:28,349 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:56:28,349 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2020-08-19 06:56:28,349 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-19 06:56:28,349 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2020-08-19 06:56:28,350 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-08-19 06:56:28,350 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:28,350 INFO L422 BasicCegarLoop]: trace histogram [13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:28,350 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-19 06:56:28,351 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:28,351 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:28,351 INFO L82 PathProgramCache]: Analyzing trace with hash -57903855, now seen corresponding path program 13 times [2020-08-19 06:56:28,351 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:28,352 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1400933067] [2020-08-19 06:56:28,352 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:28,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:28,564 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:28,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:28,567 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:56:28,568 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1400933067] [2020-08-19 06:56:28,568 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:56:28,568 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-19 06:56:28,568 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1828070679] [2020-08-19 06:56:28,569 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-19 06:56:28,569 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:28,569 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-19 06:56:28,570 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2020-08-19 06:56:28,570 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 16 states. [2020-08-19 06:56:28,716 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:56:28,716 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2020-08-19 06:56:28,716 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-19 06:56:28,717 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 23 [2020-08-19 06:56:28,717 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:56:28,717 INFO L225 Difference]: With dead ends: 30 [2020-08-19 06:56:28,717 INFO L226 Difference]: Without dead ends: 25 [2020-08-19 06:56:28,718 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 [2020-08-19 06:56:28,719 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-19 06:56:28,724 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-08-19 06:56:28,724 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-19 06:56:28,725 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2020-08-19 06:56:28,725 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 23 [2020-08-19 06:56:28,725 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:56:28,725 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2020-08-19 06:56:28,726 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-19 06:56:28,726 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2020-08-19 06:56:28,726 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-19 06:56:28,726 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:28,727 INFO L422 BasicCegarLoop]: trace histogram [14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:28,728 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-19 06:56:28,728 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:28,728 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:28,728 INFO L82 PathProgramCache]: Analyzing trace with hash -1758558242, now seen corresponding path program 14 times [2020-08-19 06:56:28,729 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:28,729 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1305320540] [2020-08-19 06:56:28,730 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:28,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:29,007 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:29,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:29,010 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:56:29,010 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1305320540] [2020-08-19 06:56:29,010 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:56:29,010 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-19 06:56:29,011 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [793569334] [2020-08-19 06:56:29,011 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-19 06:56:29,011 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:29,011 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-19 06:56:29,012 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2020-08-19 06:56:29,012 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 17 states. [2020-08-19 06:56:29,168 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:56:29,168 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2020-08-19 06:56:29,169 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-19 06:56:29,169 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 24 [2020-08-19 06:56:29,170 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:56:29,170 INFO L225 Difference]: With dead ends: 31 [2020-08-19 06:56:29,170 INFO L226 Difference]: Without dead ends: 26 [2020-08-19 06:56:29,171 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 [2020-08-19 06:56:29,171 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-19 06:56:29,175 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-08-19 06:56:29,175 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-19 06:56:29,175 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2020-08-19 06:56:29,176 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 24 [2020-08-19 06:56:29,176 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:56:29,176 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2020-08-19 06:56:29,176 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-19 06:56:29,176 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2020-08-19 06:56:29,177 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-19 06:56:29,177 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:29,177 INFO L422 BasicCegarLoop]: trace histogram [15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:29,177 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-19 06:56:29,177 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:29,178 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:29,178 INFO L82 PathProgramCache]: Analyzing trace with hash 1355730609, now seen corresponding path program 15 times [2020-08-19 06:56:29,178 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:29,178 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [721852348] [2020-08-19 06:56:29,178 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:29,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:29,458 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:29,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:29,461 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:56:29,461 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [721852348] [2020-08-19 06:56:29,461 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:56:29,462 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-19 06:56:29,462 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [657165329] [2020-08-19 06:56:29,462 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-19 06:56:29,462 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:29,463 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-19 06:56:29,463 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2020-08-19 06:56:29,463 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 18 states. [2020-08-19 06:56:29,636 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:56:29,636 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2020-08-19 06:56:29,638 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-19 06:56:29,638 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 25 [2020-08-19 06:56:29,639 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:56:29,640 INFO L225 Difference]: With dead ends: 32 [2020-08-19 06:56:29,640 INFO L226 Difference]: Without dead ends: 27 [2020-08-19 06:56:29,640 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 [2020-08-19 06:56:29,641 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-08-19 06:56:29,645 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-08-19 06:56:29,646 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-19 06:56:29,646 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2020-08-19 06:56:29,647 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 25 [2020-08-19 06:56:29,647 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:56:29,647 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2020-08-19 06:56:29,647 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-19 06:56:29,647 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2020-08-19 06:56:29,649 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-19 06:56:29,649 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:29,650 INFO L422 BasicCegarLoop]: trace histogram [16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:29,650 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-19 06:56:29,650 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:29,650 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:29,650 INFO L82 PathProgramCache]: Analyzing trace with hash -885562818, now seen corresponding path program 16 times [2020-08-19 06:56:29,651 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:29,651 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [422750747] [2020-08-19 06:56:29,651 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:29,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:29,985 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:29,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:29,989 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:56:29,990 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [422750747] [2020-08-19 06:56:29,990 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:56:29,990 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-19 06:56:29,991 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1295655211] [2020-08-19 06:56:29,991 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-19 06:56:29,992 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:29,992 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-19 06:56:29,992 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2020-08-19 06:56:29,992 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 19 states. [2020-08-19 06:56:30,221 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:56:30,222 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2020-08-19 06:56:30,225 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-19 06:56:30,225 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 26 [2020-08-19 06:56:30,225 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:56:30,226 INFO L225 Difference]: With dead ends: 33 [2020-08-19 06:56:30,226 INFO L226 Difference]: Without dead ends: 28 [2020-08-19 06:56:30,228 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 [2020-08-19 06:56:30,229 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-19 06:56:30,237 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-08-19 06:56:30,237 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-19 06:56:30,237 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2020-08-19 06:56:30,237 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 26 [2020-08-19 06:56:30,240 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:56:30,240 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2020-08-19 06:56:30,240 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-19 06:56:30,240 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2020-08-19 06:56:30,241 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-19 06:56:30,242 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:30,242 INFO L422 BasicCegarLoop]: trace histogram [17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:30,242 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-19 06:56:30,243 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:30,247 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:30,247 INFO L82 PathProgramCache]: Analyzing trace with hash -1646182319, now seen corresponding path program 17 times [2020-08-19 06:56:30,247 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:30,248 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1539058710] [2020-08-19 06:56:30,248 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:30,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:30,646 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:30,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:30,650 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:56:30,650 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1539058710] [2020-08-19 06:56:30,650 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:56:30,650 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-19 06:56:30,651 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1347813200] [2020-08-19 06:56:30,653 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-19 06:56:30,653 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:30,653 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-19 06:56:30,656 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2020-08-19 06:56:30,657 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 20 states. [2020-08-19 06:56:30,900 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:56:30,900 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2020-08-19 06:56:30,901 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-19 06:56:30,901 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 27 [2020-08-19 06:56:30,901 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:56:30,902 INFO L225 Difference]: With dead ends: 34 [2020-08-19 06:56:30,902 INFO L226 Difference]: Without dead ends: 29 [2020-08-19 06:56:30,903 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 [2020-08-19 06:56:30,904 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-19 06:56:30,907 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-08-19 06:56:30,907 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-19 06:56:30,908 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2020-08-19 06:56:30,908 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 27 [2020-08-19 06:56:30,908 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:56:30,908 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2020-08-19 06:56:30,909 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-19 06:56:30,909 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2020-08-19 06:56:30,909 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-19 06:56:30,909 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:30,910 INFO L422 BasicCegarLoop]: trace histogram [18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:30,910 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-19 06:56:30,910 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:30,910 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:30,910 INFO L82 PathProgramCache]: Analyzing trace with hash 544416926, now seen corresponding path program 18 times [2020-08-19 06:56:30,911 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:30,911 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1662099818] [2020-08-19 06:56:30,911 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:30,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:31,263 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:31,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:31,267 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:56:31,267 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1662099818] [2020-08-19 06:56:31,267 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:56:31,268 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-19 06:56:31,268 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [818343027] [2020-08-19 06:56:31,268 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-19 06:56:31,268 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:31,270 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-19 06:56:31,270 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=363, Unknown=0, NotChecked=0, Total=420 [2020-08-19 06:56:31,270 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 21 states. [2020-08-19 06:56:31,519 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:56:31,519 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2020-08-19 06:56:31,520 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-19 06:56:31,520 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 28 [2020-08-19 06:56:31,520 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:56:31,521 INFO L225 Difference]: With dead ends: 35 [2020-08-19 06:56:31,521 INFO L226 Difference]: Without dead ends: 30 [2020-08-19 06:56:31,522 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 [2020-08-19 06:56:31,522 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-19 06:56:31,526 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-08-19 06:56:31,526 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-08-19 06:56:31,527 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2020-08-19 06:56:31,527 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 28 [2020-08-19 06:56:31,527 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:56:31,527 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2020-08-19 06:56:31,528 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-19 06:56:31,528 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2020-08-19 06:56:31,528 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-08-19 06:56:31,528 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:31,528 INFO L422 BasicCegarLoop]: trace histogram [19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:31,529 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-19 06:56:31,529 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:31,529 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:31,529 INFO L82 PathProgramCache]: Analyzing trace with hash -266483215, now seen corresponding path program 19 times [2020-08-19 06:56:31,529 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:31,530 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [419562368] [2020-08-19 06:56:31,530 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:31,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:31,910 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:31,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:31,913 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:56:31,913 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [419562368] [2020-08-19 06:56:31,913 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:56:31,914 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-19 06:56:31,914 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1761248620] [2020-08-19 06:56:31,914 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-19 06:56:31,914 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:31,914 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-19 06:56:31,915 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=402, Unknown=0, NotChecked=0, Total=462 [2020-08-19 06:56:31,915 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 22 states. [2020-08-19 06:56:32,192 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:56:32,192 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2020-08-19 06:56:32,198 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-19 06:56:32,198 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 29 [2020-08-19 06:56:32,199 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:56:32,199 INFO L225 Difference]: With dead ends: 36 [2020-08-19 06:56:32,199 INFO L226 Difference]: Without dead ends: 31 [2020-08-19 06:56:32,200 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=60, Invalid=402, Unknown=0, NotChecked=0, Total=462 [2020-08-19 06:56:32,200 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-19 06:56:32,204 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2020-08-19 06:56:32,204 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-19 06:56:32,205 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2020-08-19 06:56:32,205 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 29 [2020-08-19 06:56:32,205 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:56:32,205 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2020-08-19 06:56:32,205 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-19 06:56:32,206 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2020-08-19 06:56:32,206 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-19 06:56:32,206 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:32,206 INFO L422 BasicCegarLoop]: trace histogram [20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:32,207 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-19 06:56:32,207 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:32,207 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:32,207 INFO L82 PathProgramCache]: Analyzing trace with hash 365416190, now seen corresponding path program 20 times [2020-08-19 06:56:32,207 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:32,208 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1235512239] [2020-08-19 06:56:32,208 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:32,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:32,636 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:32,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:32,641 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:56:32,641 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1235512239] [2020-08-19 06:56:32,642 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:56:32,642 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-19 06:56:32,642 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1186357854] [2020-08-19 06:56:32,643 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-19 06:56:32,643 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:32,643 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-19 06:56:32,643 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2020-08-19 06:56:32,644 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 23 states. [2020-08-19 06:56:32,906 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:56:32,907 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2020-08-19 06:56:32,907 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-19 06:56:32,907 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 30 [2020-08-19 06:56:32,908 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:56:32,908 INFO L225 Difference]: With dead ends: 37 [2020-08-19 06:56:32,908 INFO L226 Difference]: Without dead ends: 32 [2020-08-19 06:56:32,909 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 [2020-08-19 06:56:32,910 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-19 06:56:32,917 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2020-08-19 06:56:32,918 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-08-19 06:56:32,918 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2020-08-19 06:56:32,918 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 30 [2020-08-19 06:56:32,920 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:56:32,920 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2020-08-19 06:56:32,920 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-19 06:56:32,920 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2020-08-19 06:56:32,921 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-19 06:56:32,921 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:32,921 INFO L422 BasicCegarLoop]: trace histogram [21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:32,921 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-19 06:56:32,921 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:32,922 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:32,922 INFO L82 PathProgramCache]: Analyzing trace with hash -1520538735, now seen corresponding path program 21 times [2020-08-19 06:56:32,922 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:32,922 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [809192841] [2020-08-19 06:56:32,922 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:32,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:33,400 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:33,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:33,404 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:56:33,405 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [809192841] [2020-08-19 06:56:33,405 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:56:33,406 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-19 06:56:33,406 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [76976014] [2020-08-19 06:56:33,406 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-19 06:56:33,406 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:33,408 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-19 06:56:33,408 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=486, Unknown=0, NotChecked=0, Total=552 [2020-08-19 06:56:33,408 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 24 states. [2020-08-19 06:56:33,728 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:56:33,728 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2020-08-19 06:56:33,730 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-19 06:56:33,731 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 31 [2020-08-19 06:56:33,731 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:56:33,731 INFO L225 Difference]: With dead ends: 38 [2020-08-19 06:56:33,731 INFO L226 Difference]: Without dead ends: 33 [2020-08-19 06:56:33,732 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 [2020-08-19 06:56:33,732 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-19 06:56:33,736 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-08-19 06:56:33,736 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-19 06:56:33,736 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2020-08-19 06:56:33,737 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 31 [2020-08-19 06:56:33,737 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:56:33,737 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2020-08-19 06:56:33,737 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-19 06:56:33,737 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2020-08-19 06:56:33,737 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-19 06:56:33,738 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:33,738 INFO L422 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:33,738 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-19 06:56:33,738 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:33,738 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:33,738 INFO L82 PathProgramCache]: Analyzing trace with hash 144400734, now seen corresponding path program 22 times [2020-08-19 06:56:33,739 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:33,739 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [241466571] [2020-08-19 06:56:33,739 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:33,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:34,212 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:34,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:34,216 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:56:34,219 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [241466571] [2020-08-19 06:56:34,219 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:56:34,219 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-19 06:56:34,220 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [400816027] [2020-08-19 06:56:34,220 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-19 06:56:34,221 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:34,223 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-19 06:56:34,224 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=531, Unknown=0, NotChecked=0, Total=600 [2020-08-19 06:56:34,224 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 25 states. [2020-08-19 06:56:34,578 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:56:34,578 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2020-08-19 06:56:34,578 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-19 06:56:34,579 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 32 [2020-08-19 06:56:34,579 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:56:34,579 INFO L225 Difference]: With dead ends: 39 [2020-08-19 06:56:34,579 INFO L226 Difference]: Without dead ends: 34 [2020-08-19 06:56:34,580 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 [2020-08-19 06:56:34,580 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-19 06:56:34,588 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-08-19 06:56:34,589 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-19 06:56:34,590 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2020-08-19 06:56:34,590 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 32 [2020-08-19 06:56:34,590 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:56:34,590 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2020-08-19 06:56:34,590 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-19 06:56:34,591 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2020-08-19 06:56:34,593 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-19 06:56:34,593 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:34,594 INFO L422 BasicCegarLoop]: trace histogram [23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:34,596 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-19 06:56:34,596 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:34,596 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:34,597 INFO L82 PathProgramCache]: Analyzing trace with hash 217916721, now seen corresponding path program 23 times [2020-08-19 06:56:34,597 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:34,597 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [954527660] [2020-08-19 06:56:34,597 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:34,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:35,164 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:35,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:35,168 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:56:35,169 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [954527660] [2020-08-19 06:56:35,169 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:56:35,169 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-19 06:56:35,169 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [75385868] [2020-08-19 06:56:35,170 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-19 06:56:35,170 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:35,170 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-19 06:56:35,170 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=578, Unknown=0, NotChecked=0, Total=650 [2020-08-19 06:56:35,171 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand 26 states. [2020-08-19 06:56:35,574 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:56:35,574 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2020-08-19 06:56:35,575 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-19 06:56:35,575 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 33 [2020-08-19 06:56:35,575 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:56:35,575 INFO L225 Difference]: With dead ends: 40 [2020-08-19 06:56:35,576 INFO L226 Difference]: Without dead ends: 35 [2020-08-19 06:56:35,576 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=72, Invalid=578, Unknown=0, NotChecked=0, Total=650 [2020-08-19 06:56:35,576 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-19 06:56:35,582 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-08-19 06:56:35,582 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-19 06:56:35,584 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2020-08-19 06:56:35,584 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 33 [2020-08-19 06:56:35,584 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:56:35,585 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2020-08-19 06:56:35,585 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-19 06:56:35,585 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2020-08-19 06:56:35,585 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-19 06:56:35,585 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:35,586 INFO L422 BasicCegarLoop]: trace histogram [24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:35,587 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-19 06:56:35,588 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:35,588 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:35,589 INFO L82 PathProgramCache]: Analyzing trace with hash -1798054978, now seen corresponding path program 24 times [2020-08-19 06:56:35,589 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:35,589 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [190393942] [2020-08-19 06:56:35,589 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:35,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:36,155 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:36,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:36,159 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:56:36,159 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [190393942] [2020-08-19 06:56:36,159 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:56:36,160 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-19 06:56:36,160 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [600426592] [2020-08-19 06:56:36,160 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-19 06:56:36,160 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:36,160 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-19 06:56:36,161 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=627, Unknown=0, NotChecked=0, Total=702 [2020-08-19 06:56:36,161 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 27 states. [2020-08-19 06:56:36,513 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:56:36,513 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2020-08-19 06:56:36,513 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-19 06:56:36,514 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 34 [2020-08-19 06:56:36,514 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:56:36,514 INFO L225 Difference]: With dead ends: 41 [2020-08-19 06:56:36,514 INFO L226 Difference]: Without dead ends: 36 [2020-08-19 06:56:36,515 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=75, Invalid=627, Unknown=0, NotChecked=0, Total=702 [2020-08-19 06:56:36,515 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-19 06:56:36,519 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-08-19 06:56:36,519 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-19 06:56:36,520 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2020-08-19 06:56:36,520 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 34 [2020-08-19 06:56:36,520 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:56:36,520 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2020-08-19 06:56:36,520 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-19 06:56:36,521 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2020-08-19 06:56:36,521 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-08-19 06:56:36,521 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:36,521 INFO L422 BasicCegarLoop]: trace histogram [25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:36,521 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-19 06:56:36,522 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:36,522 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:36,522 INFO L82 PathProgramCache]: Analyzing trace with hash 131331793, now seen corresponding path program 25 times [2020-08-19 06:56:36,522 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:36,523 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [208261331] [2020-08-19 06:56:36,523 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:36,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:37,147 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:37,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:37,152 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:56:37,153 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [208261331] [2020-08-19 06:56:37,153 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:56:37,153 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-19 06:56:37,153 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [195933455] [2020-08-19 06:56:37,154 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-19 06:56:37,154 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:37,154 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-19 06:56:37,155 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=678, Unknown=0, NotChecked=0, Total=756 [2020-08-19 06:56:37,155 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 28 states. [2020-08-19 06:56:37,556 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:56:37,557 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2020-08-19 06:56:37,557 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-19 06:56:37,558 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 35 [2020-08-19 06:56:37,558 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:56:37,558 INFO L225 Difference]: With dead ends: 42 [2020-08-19 06:56:37,558 INFO L226 Difference]: Without dead ends: 37 [2020-08-19 06:56:37,559 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=78, Invalid=678, Unknown=0, NotChecked=0, Total=756 [2020-08-19 06:56:37,560 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-19 06:56:37,567 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-08-19 06:56:37,567 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-19 06:56:37,567 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2020-08-19 06:56:37,567 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 35 [2020-08-19 06:56:37,568 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:56:37,568 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2020-08-19 06:56:37,568 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-19 06:56:37,568 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2020-08-19 06:56:37,569 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-19 06:56:37,569 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:37,569 INFO L422 BasicCegarLoop]: trace histogram [26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:37,570 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-19 06:56:37,570 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:37,570 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:37,571 INFO L82 PathProgramCache]: Analyzing trace with hash -187220450, now seen corresponding path program 26 times [2020-08-19 06:56:37,571 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:37,571 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [104840558] [2020-08-19 06:56:37,571 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:37,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:38,191 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:38,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:38,195 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:56:38,195 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [104840558] [2020-08-19 06:56:38,195 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:56:38,195 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-19 06:56:38,196 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [624565538] [2020-08-19 06:56:38,196 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-19 06:56:38,196 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:38,196 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-19 06:56:38,197 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=731, Unknown=0, NotChecked=0, Total=812 [2020-08-19 06:56:38,197 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 29 states. [2020-08-19 06:56:38,643 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:56:38,643 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2020-08-19 06:56:38,647 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-19 06:56:38,647 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 36 [2020-08-19 06:56:38,647 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:56:38,648 INFO L225 Difference]: With dead ends: 43 [2020-08-19 06:56:38,648 INFO L226 Difference]: Without dead ends: 38 [2020-08-19 06:56:38,649 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 [2020-08-19 06:56:38,649 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-19 06:56:38,657 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-08-19 06:56:38,662 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-19 06:56:38,662 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2020-08-19 06:56:38,662 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 36 [2020-08-19 06:56:38,663 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:56:38,663 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2020-08-19 06:56:38,663 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-19 06:56:38,663 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2020-08-19 06:56:38,667 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-19 06:56:38,667 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:38,668 INFO L422 BasicCegarLoop]: trace histogram [27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:38,668 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-19 06:56:38,668 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:38,668 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:38,668 INFO L82 PathProgramCache]: Analyzing trace with hash -1472405391, now seen corresponding path program 27 times [2020-08-19 06:56:38,669 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:38,669 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [282058985] [2020-08-19 06:56:38,669 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:38,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:39,315 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:39,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:39,319 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:56:39,319 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [282058985] [2020-08-19 06:56:39,319 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:56:39,319 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-19 06:56:39,320 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1872140719] [2020-08-19 06:56:39,320 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-19 06:56:39,320 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:39,320 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-19 06:56:39,321 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=786, Unknown=0, NotChecked=0, Total=870 [2020-08-19 06:56:39,321 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 30 states. [2020-08-19 06:56:39,833 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:56:39,834 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2020-08-19 06:56:39,834 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-19 06:56:39,834 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 37 [2020-08-19 06:56:39,835 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:56:39,835 INFO L225 Difference]: With dead ends: 44 [2020-08-19 06:56:39,835 INFO L226 Difference]: Without dead ends: 39 [2020-08-19 06:56:39,836 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=84, Invalid=786, Unknown=0, NotChecked=0, Total=870 [2020-08-19 06:56:39,836 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-19 06:56:39,840 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-08-19 06:56:39,840 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-19 06:56:39,841 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2020-08-19 06:56:39,841 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 37 [2020-08-19 06:56:39,841 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:56:39,841 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2020-08-19 06:56:39,841 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-19 06:56:39,841 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2020-08-19 06:56:39,842 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-19 06:56:39,842 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:39,842 INFO L422 BasicCegarLoop]: trace histogram [28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:39,842 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-19 06:56:39,842 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:39,842 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:39,843 INFO L82 PathProgramCache]: Analyzing trace with hash 1636534398, now seen corresponding path program 28 times [2020-08-19 06:56:39,843 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:39,843 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [494056784] [2020-08-19 06:56:39,843 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:39,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:40,589 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:40,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:40,594 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:56:40,594 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [494056784] [2020-08-19 06:56:40,594 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:56:40,594 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-19 06:56:40,595 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [459328523] [2020-08-19 06:56:40,595 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-19 06:56:40,595 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:40,595 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-19 06:56:40,596 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=843, Unknown=0, NotChecked=0, Total=930 [2020-08-19 06:56:40,596 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 31 states. [2020-08-19 06:56:41,171 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:56:41,172 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2020-08-19 06:56:41,172 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-19 06:56:41,173 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 38 [2020-08-19 06:56:41,173 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:56:41,173 INFO L225 Difference]: With dead ends: 45 [2020-08-19 06:56:41,173 INFO L226 Difference]: Without dead ends: 40 [2020-08-19 06:56:41,174 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=87, Invalid=843, Unknown=0, NotChecked=0, Total=930 [2020-08-19 06:56:41,174 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-19 06:56:41,177 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2020-08-19 06:56:41,178 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-19 06:56:41,178 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 40 transitions. [2020-08-19 06:56:41,178 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 40 transitions. Word has length 38 [2020-08-19 06:56:41,178 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:56:41,179 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 40 transitions. [2020-08-19 06:56:41,179 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-19 06:56:41,179 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 40 transitions. [2020-08-19 06:56:41,179 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-19 06:56:41,179 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:41,179 INFO L422 BasicCegarLoop]: trace histogram [29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:41,180 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-19 06:56:41,180 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:41,180 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:41,180 INFO L82 PathProgramCache]: Analyzing trace with hash -770579951, now seen corresponding path program 29 times [2020-08-19 06:56:41,180 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:41,181 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [433481512] [2020-08-19 06:56:41,181 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:41,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:41,933 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:41,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:41,939 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:56:41,940 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [433481512] [2020-08-19 06:56:41,940 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:56:41,940 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-19 06:56:41,941 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1750260987] [2020-08-19 06:56:41,941 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-19 06:56:41,941 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:41,941 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-19 06:56:41,942 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=902, Unknown=0, NotChecked=0, Total=992 [2020-08-19 06:56:41,942 INFO L87 Difference]: Start difference. First operand 40 states and 40 transitions. Second operand 32 states. [2020-08-19 06:56:42,533 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:56:42,534 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2020-08-19 06:56:42,534 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-19 06:56:42,534 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 39 [2020-08-19 06:56:42,535 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:56:42,535 INFO L225 Difference]: With dead ends: 46 [2020-08-19 06:56:42,535 INFO L226 Difference]: Without dead ends: 41 [2020-08-19 06:56:42,536 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 [2020-08-19 06:56:42,536 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-19 06:56:42,539 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-08-19 06:56:42,540 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-19 06:56:42,540 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2020-08-19 06:56:42,540 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 39 [2020-08-19 06:56:42,541 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:56:42,541 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2020-08-19 06:56:42,541 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-19 06:56:42,541 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2020-08-19 06:56:42,541 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-19 06:56:42,541 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:42,542 INFO L422 BasicCegarLoop]: trace histogram [30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:42,542 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-19 06:56:42,542 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:42,542 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:42,542 INFO L82 PathProgramCache]: Analyzing trace with hash 1918286558, now seen corresponding path program 30 times [2020-08-19 06:56:42,543 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:42,543 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [98070149] [2020-08-19 06:56:42,543 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:42,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:43,331 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:43,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:43,335 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:56:43,336 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [98070149] [2020-08-19 06:56:43,336 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:56:43,336 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-19 06:56:43,336 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1936361726] [2020-08-19 06:56:43,336 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-19 06:56:43,336 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:43,337 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-19 06:56:43,337 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=963, Unknown=0, NotChecked=0, Total=1056 [2020-08-19 06:56:43,337 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 33 states. [2020-08-19 06:56:43,984 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:56:43,985 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2020-08-19 06:56:43,986 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-19 06:56:43,986 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 40 [2020-08-19 06:56:43,986 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:56:43,987 INFO L225 Difference]: With dead ends: 47 [2020-08-19 06:56:43,987 INFO L226 Difference]: Without dead ends: 42 [2020-08-19 06:56:43,988 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 [2020-08-19 06:56:43,988 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-19 06:56:43,990 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-08-19 06:56:43,990 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-19 06:56:43,991 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2020-08-19 06:56:43,991 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 40 [2020-08-19 06:56:43,991 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:56:43,991 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2020-08-19 06:56:43,992 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-19 06:56:43,992 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2020-08-19 06:56:43,992 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-19 06:56:43,992 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:43,992 INFO L422 BasicCegarLoop]: trace histogram [31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:43,993 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-19 06:56:43,993 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:43,994 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:43,994 INFO L82 PathProgramCache]: Analyzing trace with hash -626197583, now seen corresponding path program 31 times [2020-08-19 06:56:43,994 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:43,995 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1770535545] [2020-08-19 06:56:43,995 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:44,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:44,792 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:44,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:44,797 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:56:44,797 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1770535545] [2020-08-19 06:56:44,797 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:56:44,797 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-19 06:56:44,798 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [817065945] [2020-08-19 06:56:44,798 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-19 06:56:44,798 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:44,798 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-19 06:56:44,799 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=1026, Unknown=0, NotChecked=0, Total=1122 [2020-08-19 06:56:44,799 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand 34 states. [2020-08-19 06:56:45,484 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:56:45,485 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2020-08-19 06:56:45,485 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-19 06:56:45,486 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 41 [2020-08-19 06:56:45,486 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:56:45,486 INFO L225 Difference]: With dead ends: 48 [2020-08-19 06:56:45,487 INFO L226 Difference]: Without dead ends: 43 [2020-08-19 06:56:45,487 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 [2020-08-19 06:56:45,488 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-19 06:56:45,490 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-08-19 06:56:45,491 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-19 06:56:45,491 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2020-08-19 06:56:45,491 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 41 [2020-08-19 06:56:45,491 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:56:45,492 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2020-08-19 06:56:45,492 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-19 06:56:45,492 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2020-08-19 06:56:45,492 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-19 06:56:45,492 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:45,492 INFO L422 BasicCegarLoop]: trace histogram [32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:45,493 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-19 06:56:45,493 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:45,493 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:45,493 INFO L82 PathProgramCache]: Analyzing trace with hash 2099172670, now seen corresponding path program 32 times [2020-08-19 06:56:45,493 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:45,494 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [391837992] [2020-08-19 06:56:45,494 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:45,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:46,383 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:46,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:46,388 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:56:46,388 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [391837992] [2020-08-19 06:56:46,389 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:56:46,389 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-19 06:56:46,389 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [561216097] [2020-08-19 06:56:46,389 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-19 06:56:46,389 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:46,390 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-19 06:56:46,390 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=1091, Unknown=0, NotChecked=0, Total=1190 [2020-08-19 06:56:46,390 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 35 states. [2020-08-19 06:56:47,132 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:56:47,132 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2020-08-19 06:56:47,132 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-19 06:56:47,133 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 42 [2020-08-19 06:56:47,133 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:56:47,133 INFO L225 Difference]: With dead ends: 49 [2020-08-19 06:56:47,134 INFO L226 Difference]: Without dead ends: 44 [2020-08-19 06:56:47,135 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 [2020-08-19 06:56:47,135 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-19 06:56:47,138 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-08-19 06:56:47,139 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-19 06:56:47,139 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2020-08-19 06:56:47,139 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 42 [2020-08-19 06:56:47,139 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:56:47,139 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2020-08-19 06:56:47,140 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-19 06:56:47,140 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2020-08-19 06:56:47,140 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-19 06:56:47,140 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:47,140 INFO L422 BasicCegarLoop]: trace histogram [33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:47,141 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-19 06:56:47,141 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:47,141 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:47,142 INFO L82 PathProgramCache]: Analyzing trace with hash 686304593, now seen corresponding path program 33 times [2020-08-19 06:56:47,142 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:47,142 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [387211904] [2020-08-19 06:56:47,142 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:47,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:48,157 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:48,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:48,163 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:56:48,163 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [387211904] [2020-08-19 06:56:48,164 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:56:48,164 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-19 06:56:48,164 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1189593478] [2020-08-19 06:56:48,164 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-19 06:56:48,164 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:48,165 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-19 06:56:48,165 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=1158, Unknown=0, NotChecked=0, Total=1260 [2020-08-19 06:56:48,165 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 36 states. [2020-08-19 06:56:48,912 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:56:48,912 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2020-08-19 06:56:48,912 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-19 06:56:48,913 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 43 [2020-08-19 06:56:48,913 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:56:48,913 INFO L225 Difference]: With dead ends: 50 [2020-08-19 06:56:48,913 INFO L226 Difference]: Without dead ends: 45 [2020-08-19 06:56:48,914 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=102, Invalid=1158, Unknown=0, NotChecked=0, Total=1260 [2020-08-19 06:56:48,915 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-08-19 06:56:48,917 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2020-08-19 06:56:48,918 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-19 06:56:48,918 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2020-08-19 06:56:48,918 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 43 [2020-08-19 06:56:48,918 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:56:48,919 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2020-08-19 06:56:48,919 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-19 06:56:48,919 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2020-08-19 06:56:48,919 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-19 06:56:48,919 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:48,919 INFO L422 BasicCegarLoop]: trace histogram [34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:48,920 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-19 06:56:48,920 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:48,920 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:48,920 INFO L82 PathProgramCache]: Analyzing trace with hash -162932834, now seen corresponding path program 34 times [2020-08-19 06:56:48,920 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:48,920 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [184564633] [2020-08-19 06:56:48,921 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:48,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:49,869 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:49,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:49,875 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:56:49,875 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [184564633] [2020-08-19 06:56:49,875 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:56:49,875 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-19 06:56:49,876 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1318328390] [2020-08-19 06:56:49,876 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-19 06:56:49,876 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:49,876 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-19 06:56:49,877 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=1227, Unknown=0, NotChecked=0, Total=1332 [2020-08-19 06:56:49,877 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 37 states. [2020-08-19 06:56:50,714 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:56:50,714 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2020-08-19 06:56:50,715 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-19 06:56:50,715 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 44 [2020-08-19 06:56:50,716 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:56:50,716 INFO L225 Difference]: With dead ends: 51 [2020-08-19 06:56:50,716 INFO L226 Difference]: Without dead ends: 46 [2020-08-19 06:56:50,717 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=105, Invalid=1227, Unknown=0, NotChecked=0, Total=1332 [2020-08-19 06:56:50,717 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-19 06:56:50,720 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2020-08-19 06:56:50,720 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-19 06:56:50,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 46 transitions. [2020-08-19 06:56:50,721 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 46 transitions. Word has length 44 [2020-08-19 06:56:50,721 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:56:50,721 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 46 transitions. [2020-08-19 06:56:50,721 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-19 06:56:50,721 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 46 transitions. [2020-08-19 06:56:50,722 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-08-19 06:56:50,722 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:50,722 INFO L422 BasicCegarLoop]: trace histogram [35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:50,722 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-19 06:56:50,722 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:50,723 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:50,723 INFO L82 PathProgramCache]: Analyzing trace with hash -719489295, now seen corresponding path program 35 times [2020-08-19 06:56:50,723 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:50,723 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1436193167] [2020-08-19 06:56:50,723 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:50,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:51,795 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:51,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:51,802 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:56:51,802 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1436193167] [2020-08-19 06:56:51,802 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:56:51,803 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-19 06:56:51,803 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1396162143] [2020-08-19 06:56:51,803 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-19 06:56:51,803 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:51,803 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-19 06:56:51,804 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=1298, Unknown=0, NotChecked=0, Total=1406 [2020-08-19 06:56:51,804 INFO L87 Difference]: Start difference. First operand 46 states and 46 transitions. Second operand 38 states. [2020-08-19 06:56:52,616 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:56:52,617 INFO L93 Difference]: Finished difference Result 52 states and 52 transitions. [2020-08-19 06:56:52,617 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-19 06:56:52,617 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 45 [2020-08-19 06:56:52,618 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:56:52,618 INFO L225 Difference]: With dead ends: 52 [2020-08-19 06:56:52,619 INFO L226 Difference]: Without dead ends: 47 [2020-08-19 06:56:52,620 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=108, Invalid=1298, Unknown=0, NotChecked=0, Total=1406 [2020-08-19 06:56:52,620 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-19 06:56:52,623 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2020-08-19 06:56:52,624 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-19 06:56:52,624 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2020-08-19 06:56:52,624 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 45 [2020-08-19 06:56:52,624 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:56:52,624 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2020-08-19 06:56:52,625 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-19 06:56:52,625 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2020-08-19 06:56:52,625 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-19 06:56:52,625 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:52,625 INFO L422 BasicCegarLoop]: trace histogram [36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:52,626 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-19 06:56:52,626 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:52,626 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:52,626 INFO L82 PathProgramCache]: Analyzing trace with hash -792870402, now seen corresponding path program 36 times [2020-08-19 06:56:52,626 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:52,626 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1036622440] [2020-08-19 06:56:52,627 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:52,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:53,625 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:53,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:53,630 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:56:53,631 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1036622440] [2020-08-19 06:56:53,631 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:56:53,631 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-19 06:56:53,631 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1774248569] [2020-08-19 06:56:53,632 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-19 06:56:53,632 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:53,632 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-19 06:56:53,633 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=1371, Unknown=0, NotChecked=0, Total=1482 [2020-08-19 06:56:53,633 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 39 states. [2020-08-19 06:56:54,514 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:56:54,514 INFO L93 Difference]: Finished difference Result 53 states and 53 transitions. [2020-08-19 06:56:54,516 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-19 06:56:54,516 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 46 [2020-08-19 06:56:54,517 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:56:54,517 INFO L225 Difference]: With dead ends: 53 [2020-08-19 06:56:54,517 INFO L226 Difference]: Without dead ends: 48 [2020-08-19 06:56:54,518 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 [2020-08-19 06:56:54,518 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-19 06:56:54,521 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-08-19 06:56:54,521 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-19 06:56:54,521 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 48 transitions. [2020-08-19 06:56:54,522 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 48 transitions. Word has length 46 [2020-08-19 06:56:54,522 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:56:54,522 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 48 transitions. [2020-08-19 06:56:54,522 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-19 06:56:54,522 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 48 transitions. [2020-08-19 06:56:54,523 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-08-19 06:56:54,523 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:54,523 INFO L422 BasicCegarLoop]: trace histogram [37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:54,523 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-19 06:56:54,523 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:54,523 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:54,524 INFO L82 PathProgramCache]: Analyzing trace with hash 1227282577, now seen corresponding path program 37 times [2020-08-19 06:56:54,524 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:54,524 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1825377538] [2020-08-19 06:56:54,524 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:54,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:55,607 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:55,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:55,612 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:56:55,612 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1825377538] [2020-08-19 06:56:55,612 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:56:55,612 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-19 06:56:55,613 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1563776062] [2020-08-19 06:56:55,613 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-19 06:56:55,613 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:55,613 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-19 06:56:55,614 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=1446, Unknown=0, NotChecked=0, Total=1560 [2020-08-19 06:56:55,614 INFO L87 Difference]: Start difference. First operand 48 states and 48 transitions. Second operand 40 states. [2020-08-19 06:56:56,554 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:56:56,554 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2020-08-19 06:56:56,555 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-19 06:56:56,555 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 47 [2020-08-19 06:56:56,555 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:56:56,556 INFO L225 Difference]: With dead ends: 54 [2020-08-19 06:56:56,556 INFO L226 Difference]: Without dead ends: 49 [2020-08-19 06:56:56,556 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 [2020-08-19 06:56:56,557 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-19 06:56:56,559 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-19 06:56:56,559 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-19 06:56:56,560 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2020-08-19 06:56:56,560 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 47 [2020-08-19 06:56:56,560 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:56:56,560 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2020-08-19 06:56:56,560 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-19 06:56:56,561 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2020-08-19 06:56:56,561 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-19 06:56:56,561 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:56,561 INFO L422 BasicCegarLoop]: trace histogram [38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:56,561 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-19 06:56:56,562 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:56,562 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:56,562 INFO L82 PathProgramCache]: Analyzing trace with hash -572484514, now seen corresponding path program 38 times [2020-08-19 06:56:56,562 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:56,562 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1170967751] [2020-08-19 06:56:56,562 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:56,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:57,716 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:57,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:57,721 INFO L134 CoverageAnalysis]: Checked inductivity of 741 backedges. 0 proven. 741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:56:57,722 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1170967751] [2020-08-19 06:56:57,722 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:56:57,722 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-19 06:56:57,722 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2084250895] [2020-08-19 06:56:57,723 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-19 06:56:57,723 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:57,723 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-19 06:56:57,724 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=1523, Unknown=0, NotChecked=0, Total=1640 [2020-08-19 06:56:57,724 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand 41 states. [2020-08-19 06:56:58,748 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:56:58,748 INFO L93 Difference]: Finished difference Result 55 states and 55 transitions. [2020-08-19 06:56:58,748 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-19 06:56:58,749 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 48 [2020-08-19 06:56:58,749 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:56:58,750 INFO L225 Difference]: With dead ends: 55 [2020-08-19 06:56:58,750 INFO L226 Difference]: Without dead ends: 50 [2020-08-19 06:56:58,751 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 [2020-08-19 06:56:58,751 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-08-19 06:56:58,754 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2020-08-19 06:56:58,754 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-08-19 06:56:58,754 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 50 transitions. [2020-08-19 06:56:58,755 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 50 transitions. Word has length 48 [2020-08-19 06:56:58,755 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:56:58,755 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 50 transitions. [2020-08-19 06:56:58,755 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-19 06:56:58,755 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 50 transitions. [2020-08-19 06:56:58,756 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-08-19 06:56:58,756 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:58,756 INFO L422 BasicCegarLoop]: trace histogram [39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:58,756 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-19 06:56:58,756 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:58,756 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:58,757 INFO L82 PathProgramCache]: Analyzing trace with hash -530689487, now seen corresponding path program 39 times [2020-08-19 06:56:58,757 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:58,757 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [748353263] [2020-08-19 06:56:58,757 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:58,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:59,985 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:59,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:59,997 INFO L134 CoverageAnalysis]: Checked inductivity of 780 backedges. 0 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:56:59,998 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [748353263] [2020-08-19 06:56:59,998 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:56:59,998 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-19 06:56:59,998 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [733787496] [2020-08-19 06:56:59,999 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-19 06:56:59,999 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:57:00,000 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-19 06:57:00,000 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=1602, Unknown=0, NotChecked=0, Total=1722 [2020-08-19 06:57:00,000 INFO L87 Difference]: Start difference. First operand 50 states and 50 transitions. Second operand 42 states. [2020-08-19 06:57:01,049 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:57:01,049 INFO L93 Difference]: Finished difference Result 56 states and 56 transitions. [2020-08-19 06:57:01,050 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-19 06:57:01,050 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 49 [2020-08-19 06:57:01,051 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:57:01,051 INFO L225 Difference]: With dead ends: 56 [2020-08-19 06:57:01,051 INFO L226 Difference]: Without dead ends: 51 [2020-08-19 06:57:01,052 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 [2020-08-19 06:57:01,052 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-08-19 06:57:01,055 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2020-08-19 06:57:01,056 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-19 06:57:01,056 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2020-08-19 06:57:01,056 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 49 [2020-08-19 06:57:01,056 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:57:01,057 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2020-08-19 06:57:01,057 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-19 06:57:01,057 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2020-08-19 06:57:01,057 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-19 06:57:01,057 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:57:01,057 INFO L422 BasicCegarLoop]: trace histogram [40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:57:01,058 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-19 06:57:01,058 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:57:01,058 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:57:01,058 INFO L82 PathProgramCache]: Analyzing trace with hash 764956350, now seen corresponding path program 40 times [2020-08-19 06:57:01,058 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:57:01,058 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [439363136] [2020-08-19 06:57:01,058 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:57:01,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:57:02,693 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:57:02,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:57:02,698 INFO L134 CoverageAnalysis]: Checked inductivity of 820 backedges. 0 proven. 820 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:57:02,699 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [439363136] [2020-08-19 06:57:02,699 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:57:02,699 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-19 06:57:02,699 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1436931340] [2020-08-19 06:57:02,700 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-19 06:57:02,700 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:57:02,700 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-19 06:57:02,701 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=1683, Unknown=0, NotChecked=0, Total=1806 [2020-08-19 06:57:02,701 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 43 states. [2020-08-19 06:57:03,847 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:57:03,847 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2020-08-19 06:57:03,848 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-08-19 06:57:03,848 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 50 [2020-08-19 06:57:03,848 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:57:03,849 INFO L225 Difference]: With dead ends: 57 [2020-08-19 06:57:03,849 INFO L226 Difference]: Without dead ends: 52 [2020-08-19 06:57:03,850 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=123, Invalid=1683, Unknown=0, NotChecked=0, Total=1806 [2020-08-19 06:57:03,851 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-19 06:57:03,853 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2020-08-19 06:57:03,854 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-08-19 06:57:03,854 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 52 transitions. [2020-08-19 06:57:03,854 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 52 transitions. Word has length 50 [2020-08-19 06:57:03,854 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:57:03,855 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 52 transitions. [2020-08-19 06:57:03,855 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-19 06:57:03,855 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 52 transitions. [2020-08-19 06:57:03,855 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-08-19 06:57:03,855 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:57:03,855 INFO L422 BasicCegarLoop]: trace histogram [41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:57:03,856 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-19 06:57:03,856 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:57:03,856 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:57:03,856 INFO L82 PathProgramCache]: Analyzing trace with hash -2019695663, now seen corresponding path program 41 times [2020-08-19 06:57:03,856 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:57:03,856 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [296759303] [2020-08-19 06:57:03,857 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:57:03,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:57:05,145 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:57:05,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:57:05,151 INFO L134 CoverageAnalysis]: Checked inductivity of 861 backedges. 0 proven. 861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:57:05,151 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [296759303] [2020-08-19 06:57:05,151 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:57:05,152 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44] total 44 [2020-08-19 06:57:05,152 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1820502226] [2020-08-19 06:57:05,152 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-08-19 06:57:05,152 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:57:05,152 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-08-19 06:57:05,153 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=1766, Unknown=0, NotChecked=0, Total=1892 [2020-08-19 06:57:05,153 INFO L87 Difference]: Start difference. First operand 52 states and 52 transitions. Second operand 44 states. [2020-08-19 06:57:06,335 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:57:06,335 INFO L93 Difference]: Finished difference Result 58 states and 58 transitions. [2020-08-19 06:57:06,337 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-08-19 06:57:06,337 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 51 [2020-08-19 06:57:06,338 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:57:06,338 INFO L225 Difference]: With dead ends: 58 [2020-08-19 06:57:06,339 INFO L226 Difference]: Without dead ends: 53 [2020-08-19 06:57:06,340 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 [2020-08-19 06:57:06,340 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-08-19 06:57:06,343 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2020-08-19 06:57:06,343 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-19 06:57:06,343 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2020-08-19 06:57:06,344 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 51 [2020-08-19 06:57:06,344 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:57:06,344 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2020-08-19 06:57:06,344 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-08-19 06:57:06,344 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2020-08-19 06:57:06,344 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-19 06:57:06,345 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:57:06,345 INFO L422 BasicCegarLoop]: trace histogram [42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:57:06,345 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-08-19 06:57:06,345 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:57:06,346 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:57:06,346 INFO L82 PathProgramCache]: Analyzing trace with hash 1850405150, now seen corresponding path program 42 times [2020-08-19 06:57:06,347 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:57:06,347 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1839199258] [2020-08-19 06:57:06,347 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:57:06,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:57:07,720 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:57:07,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:57:07,728 INFO L134 CoverageAnalysis]: Checked inductivity of 903 backedges. 0 proven. 903 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:57:07,728 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1839199258] [2020-08-19 06:57:07,728 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:57:07,728 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45] total 45 [2020-08-19 06:57:07,728 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [795086781] [2020-08-19 06:57:07,729 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2020-08-19 06:57:07,729 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:57:07,729 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2020-08-19 06:57:07,730 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=1851, Unknown=0, NotChecked=0, Total=1980 [2020-08-19 06:57:07,730 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 45 states. [2020-08-19 06:57:08,941 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:57:08,941 INFO L93 Difference]: Finished difference Result 59 states and 59 transitions. [2020-08-19 06:57:08,944 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2020-08-19 06:57:08,944 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 52 [2020-08-19 06:57:08,944 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:57:08,945 INFO L225 Difference]: With dead ends: 59 [2020-08-19 06:57:08,945 INFO L226 Difference]: Without dead ends: 54 [2020-08-19 06:57:08,946 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 [2020-08-19 06:57:08,946 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-19 06:57:08,949 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2020-08-19 06:57:08,949 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-08-19 06:57:08,950 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 54 transitions. [2020-08-19 06:57:08,950 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 54 transitions. Word has length 52 [2020-08-19 06:57:08,950 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:57:08,950 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 54 transitions. [2020-08-19 06:57:08,950 INFO L480 AbstractCegarLoop]: Interpolant automaton has 45 states. [2020-08-19 06:57:08,950 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 54 transitions. [2020-08-19 06:57:08,951 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-08-19 06:57:08,951 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:57:08,951 INFO L422 BasicCegarLoop]: trace histogram [43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:57:08,951 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2020-08-19 06:57:08,951 INFO L427 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:57:08,951 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:57:08,952 INFO L82 PathProgramCache]: Analyzing trace with hash 1564446065, now seen corresponding path program 43 times [2020-08-19 06:57:08,952 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:57:08,952 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [224969204] [2020-08-19 06:57:08,952 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:57:08,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:57:10,410 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:57:10,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:57:10,415 INFO L134 CoverageAnalysis]: Checked inductivity of 946 backedges. 0 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:57:10,416 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [224969204] [2020-08-19 06:57:10,416 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:57:10,416 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46] total 46 [2020-08-19 06:57:10,416 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1432277853] [2020-08-19 06:57:10,416 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2020-08-19 06:57:10,416 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:57:10,417 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2020-08-19 06:57:10,417 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=1938, Unknown=0, NotChecked=0, Total=2070 [2020-08-19 06:57:10,417 INFO L87 Difference]: Start difference. First operand 54 states and 54 transitions. Second operand 46 states. [2020-08-19 06:57:11,659 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:57:11,659 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2020-08-19 06:57:11,659 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2020-08-19 06:57:11,660 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 53 [2020-08-19 06:57:11,660 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:57:11,660 INFO L225 Difference]: With dead ends: 60 [2020-08-19 06:57:11,660 INFO L226 Difference]: Without dead ends: 55 [2020-08-19 06:57:11,661 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 [2020-08-19 06:57:11,661 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-08-19 06:57:11,663 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2020-08-19 06:57:11,663 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-19 06:57:11,664 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2020-08-19 06:57:11,664 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 53 [2020-08-19 06:57:11,664 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:57:11,664 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2020-08-19 06:57:11,664 INFO L480 AbstractCegarLoop]: Interpolant automaton has 46 states. [2020-08-19 06:57:11,664 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2020-08-19 06:57:11,665 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-19 06:57:11,665 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:57:11,665 INFO L422 BasicCegarLoop]: trace histogram [44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:57:11,665 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2020-08-19 06:57:11,665 INFO L427 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:57:11,665 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:57:11,665 INFO L82 PathProgramCache]: Analyzing trace with hash 1289649022, now seen corresponding path program 44 times [2020-08-19 06:57:11,665 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:57:11,665 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1307416016] [2020-08-19 06:57:11,666 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:57:11,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:57:13,185 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:57:13,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:57:13,191 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 990 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:57:13,191 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1307416016] [2020-08-19 06:57:13,192 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:57:13,192 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47] total 47 [2020-08-19 06:57:13,192 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [359794045] [2020-08-19 06:57:13,192 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2020-08-19 06:57:13,192 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:57:13,193 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2020-08-19 06:57:13,193 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=2027, Unknown=0, NotChecked=0, Total=2162 [2020-08-19 06:57:13,193 INFO L87 Difference]: Start difference. First operand 55 states and 55 transitions. Second operand 47 states. [2020-08-19 06:57:14,515 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:57:14,515 INFO L93 Difference]: Finished difference Result 61 states and 61 transitions. [2020-08-19 06:57:14,516 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2020-08-19 06:57:14,516 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 54 [2020-08-19 06:57:14,516 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:57:14,517 INFO L225 Difference]: With dead ends: 61 [2020-08-19 06:57:14,517 INFO L226 Difference]: Without dead ends: 56 [2020-08-19 06:57:14,517 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 [2020-08-19 06:57:14,518 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-08-19 06:57:14,521 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2020-08-19 06:57:14,521 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-08-19 06:57:14,522 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 56 transitions. [2020-08-19 06:57:14,522 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 56 transitions. Word has length 54 [2020-08-19 06:57:14,522 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:57:14,522 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 56 transitions. [2020-08-19 06:57:14,522 INFO L480 AbstractCegarLoop]: Interpolant automaton has 47 states. [2020-08-19 06:57:14,522 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 56 transitions. [2020-08-19 06:57:14,523 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-08-19 06:57:14,523 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:57:14,523 INFO L422 BasicCegarLoop]: trace histogram [45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:57:14,523 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2020-08-19 06:57:14,523 INFO L427 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:57:14,524 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:57:14,524 INFO L82 PathProgramCache]: Analyzing trace with hash 1360875281, now seen corresponding path program 45 times [2020-08-19 06:57:14,524 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:57:14,524 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [922097405] [2020-08-19 06:57:14,524 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:57:14,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:57:16,283 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:57:16,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:57:16,290 INFO L134 CoverageAnalysis]: Checked inductivity of 1035 backedges. 0 proven. 1035 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:57:16,291 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [922097405] [2020-08-19 06:57:16,291 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:57:16,291 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48] total 48 [2020-08-19 06:57:16,291 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1409474060] [2020-08-19 06:57:16,292 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-08-19 06:57:16,292 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:57:16,292 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-08-19 06:57:16,293 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=2118, Unknown=0, NotChecked=0, Total=2256 [2020-08-19 06:57:16,293 INFO L87 Difference]: Start difference. First operand 56 states and 56 transitions. Second operand 48 states. [2020-08-19 06:57:17,599 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:57:17,600 INFO L93 Difference]: Finished difference Result 62 states and 62 transitions. [2020-08-19 06:57:17,600 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-08-19 06:57:17,601 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 55 [2020-08-19 06:57:17,601 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:57:17,601 INFO L225 Difference]: With dead ends: 62 [2020-08-19 06:57:17,602 INFO L226 Difference]: Without dead ends: 57 [2020-08-19 06:57:17,602 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=138, Invalid=2118, Unknown=0, NotChecked=0, Total=2256 [2020-08-19 06:57:17,602 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-08-19 06:57:17,606 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2020-08-19 06:57:17,606 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-19 06:57:17,606 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2020-08-19 06:57:17,607 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 55 [2020-08-19 06:57:17,607 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:57:17,607 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2020-08-19 06:57:17,607 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-08-19 06:57:17,607 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2020-08-19 06:57:17,607 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-19 06:57:17,608 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:57:17,608 INFO L422 BasicCegarLoop]: trace histogram [46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:57:17,608 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2020-08-19 06:57:17,608 INFO L427 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:57:17,608 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:57:17,608 INFO L82 PathProgramCache]: Analyzing trace with hash -726077986, now seen corresponding path program 46 times [2020-08-19 06:57:17,609 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:57:17,609 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1611595134] [2020-08-19 06:57:17,609 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:57:17,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:57:19,203 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:57:19,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:57:19,212 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:57:19,212 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1611595134] [2020-08-19 06:57:19,212 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:57:19,213 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49] total 49 [2020-08-19 06:57:19,213 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [971363778] [2020-08-19 06:57:19,213 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2020-08-19 06:57:19,213 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:57:19,214 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2020-08-19 06:57:19,214 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=2211, Unknown=0, NotChecked=0, Total=2352 [2020-08-19 06:57:19,214 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 49 states. [2020-08-19 06:57:20,626 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:57:20,626 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2020-08-19 06:57:20,627 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2020-08-19 06:57:20,627 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 56 [2020-08-19 06:57:20,627 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:57:20,628 INFO L225 Difference]: With dead ends: 63 [2020-08-19 06:57:20,628 INFO L226 Difference]: Without dead ends: 58 [2020-08-19 06:57:20,628 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 [2020-08-19 06:57:20,629 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-19 06:57:20,632 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2020-08-19 06:57:20,632 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-08-19 06:57:20,632 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 58 transitions. [2020-08-19 06:57:20,632 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 58 transitions. Word has length 56 [2020-08-19 06:57:20,633 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:57:20,633 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 58 transitions. [2020-08-19 06:57:20,633 INFO L480 AbstractCegarLoop]: Interpolant automaton has 49 states. [2020-08-19 06:57:20,633 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 58 transitions. [2020-08-19 06:57:20,633 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-08-19 06:57:20,633 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:57:20,633 INFO L422 BasicCegarLoop]: trace histogram [47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:57:20,634 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2020-08-19 06:57:20,634 INFO L427 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:57:20,634 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:57:20,634 INFO L82 PathProgramCache]: Analyzing trace with hash -997119823, now seen corresponding path program 47 times [2020-08-19 06:57:20,634 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:57:20,634 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2094489978] [2020-08-19 06:57:20,634 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:57:20,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:57:22,354 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:57:22,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:57:22,364 INFO L134 CoverageAnalysis]: Checked inductivity of 1128 backedges. 0 proven. 1128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:57:22,365 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2094489978] [2020-08-19 06:57:22,365 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:57:22,365 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50] total 50 [2020-08-19 06:57:22,365 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1349096671] [2020-08-19 06:57:22,366 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-08-19 06:57:22,366 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:57:22,366 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-08-19 06:57:22,367 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=144, Invalid=2306, Unknown=0, NotChecked=0, Total=2450 [2020-08-19 06:57:22,367 INFO L87 Difference]: Start difference. First operand 58 states and 58 transitions. Second operand 50 states.