/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/array-lopstr16/flag_loopdep.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-19 06:55:21,861 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-19 06:55:21,864 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-19 06:55:21,889 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-19 06:55:21,890 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-19 06:55:21,891 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-19 06:55:21,892 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-19 06:55:21,894 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-19 06:55:21,896 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-19 06:55:21,897 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-19 06:55:21,898 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-19 06:55:21,899 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-19 06:55:21,899 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-19 06:55:21,900 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-19 06:55:21,901 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-19 06:55:21,902 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-19 06:55:21,903 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-19 06:55:21,904 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-19 06:55:21,906 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-19 06:55:21,911 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-19 06:55:21,912 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-19 06:55:21,914 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-19 06:55:21,915 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-19 06:55:21,916 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-19 06:55:21,918 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-19 06:55:21,926 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-19 06:55:21,927 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-19 06:55:21,928 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-19 06:55:21,928 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 06:55:21,952 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-19 06:55:21,952 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-19 06:55:21,953 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-19 06:55:21,954 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-19 06:55:21,954 INFO L138 SettingsManager]: * Use SBE=true [2020-08-19 06:55:21,954 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-19 06:55:21,954 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-19 06:55:21,954 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-19 06:55:21,955 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-19 06:55:21,955 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-19 06:55:21,955 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-19 06:55:21,955 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-19 06:55:21,955 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-19 06:55:21,955 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-19 06:55:21,956 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-19 06:55:21,956 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-19 06:55:21,956 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-19 06:55:21,956 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-19 06:55:21,957 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-19 06:55:21,957 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-19 06:55:21,957 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-19 06:55:21,957 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-19 06:55:21,957 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-19 06:55:21,958 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-19 06:55:21,958 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-19 06:55:21,958 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-19 06:55:21,958 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-19 06:55:21,958 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-19 06:55:21,959 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-19 06:55:21,959 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 06:55:22,255 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-19 06:55:22,268 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-19 06:55:22,272 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-19 06:55:22,274 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-19 06:55:22,274 INFO L275 PluginConnector]: CDTParser initialized [2020-08-19 06:55:22,275 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-lopstr16/flag_loopdep.i [2020-08-19 06:55:22,348 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/3d3d2c8ab/589258c6565a4b7b85a44adbe60e45d0/FLAG8e90a8806 [2020-08-19 06:55:22,830 INFO L306 CDTParser]: Found 1 translation units. [2020-08-19 06:55:22,830 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/array-lopstr16/flag_loopdep.i [2020-08-19 06:55:22,838 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/3d3d2c8ab/589258c6565a4b7b85a44adbe60e45d0/FLAG8e90a8806 [2020-08-19 06:55:23,202 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/3d3d2c8ab/589258c6565a4b7b85a44adbe60e45d0 [2020-08-19 06:55:23,213 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-19 06:55:23,215 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-19 06:55:23,218 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-19 06:55:23,218 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-19 06:55:23,222 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-19 06:55:23,223 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 06:55:23" (1/1) ... [2020-08-19 06:55:23,226 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@58419e08 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:55:23, skipping insertion in model container [2020-08-19 06:55:23,226 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 06:55:23" (1/1) ... [2020-08-19 06:55:23,234 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-19 06:55:23,250 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-19 06:55:23,448 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-19 06:55:23,454 INFO L203 MainTranslator]: Completed pre-run [2020-08-19 06:55:23,474 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-19 06:55:23,489 INFO L208 MainTranslator]: Completed translation [2020-08-19 06:55:23,490 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:55:23 WrapperNode [2020-08-19 06:55:23,490 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-19 06:55:23,491 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-19 06:55:23,491 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-19 06:55:23,491 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-19 06:55:23,573 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:55:23" (1/1) ... [2020-08-19 06:55:23,573 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:55:23" (1/1) ... [2020-08-19 06:55:23,581 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:55:23" (1/1) ... [2020-08-19 06:55:23,582 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:55:23" (1/1) ... [2020-08-19 06:55:23,590 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:55:23" (1/1) ... [2020-08-19 06:55:23,595 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:55:23" (1/1) ... [2020-08-19 06:55:23,597 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:55:23" (1/1) ... [2020-08-19 06:55:23,599 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-19 06:55:23,600 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-19 06:55:23,600 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-19 06:55:23,600 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-19 06:55:23,601 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:55:23" (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 06:55:23,657 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-19 06:55:23,657 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-19 06:55:23,657 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-19 06:55:23,658 INFO L138 BoogieDeclarations]: Found implementation of procedure init [2020-08-19 06:55:23,658 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-19 06:55:23,658 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-19 06:55:23,658 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-19 06:55:23,658 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2020-08-19 06:55:23,658 INFO L130 BoogieDeclarations]: Found specification of procedure nondet_pointer [2020-08-19 06:55:23,659 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-08-19 06:55:23,659 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-08-19 06:55:23,659 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-08-19 06:55:23,659 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-19 06:55:23,659 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-19 06:55:23,659 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-08-19 06:55:23,660 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-19 06:55:23,660 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-19 06:55:23,660 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-19 06:55:23,978 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-19 06:55:23,979 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-08-19 06:55:23,983 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 06:55:23 BoogieIcfgContainer [2020-08-19 06:55:23,984 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-19 06:55:23,985 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-19 06:55:23,985 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-19 06:55:23,988 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-19 06:55:23,988 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.08 06:55:23" (1/3) ... [2020-08-19 06:55:23,989 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@cdd3690 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 06:55:23, skipping insertion in model container [2020-08-19 06:55:23,989 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:55:23" (2/3) ... [2020-08-19 06:55:23,990 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@cdd3690 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 06:55:23, skipping insertion in model container [2020-08-19 06:55:23,990 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 06:55:23" (3/3) ... [2020-08-19 06:55:23,992 INFO L109 eAbstractionObserver]: Analyzing ICFG flag_loopdep.i [2020-08-19 06:55:24,004 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-19 06:55:24,012 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-19 06:55:24,028 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-19 06:55:24,063 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-19 06:55:24,063 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-19 06:55:24,063 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-19 06:55:24,063 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-19 06:55:24,063 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-19 06:55:24,064 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-19 06:55:24,064 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-19 06:55:24,064 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-19 06:55:24,094 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-08-19 06:55:24,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-19 06:55:24,102 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:55:24,103 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:55:24,104 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:55:24,113 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:55:24,114 INFO L82 PathProgramCache]: Analyzing trace with hash 1059974619, now seen corresponding path program 1 times [2020-08-19 06:55:24,120 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:55:24,121 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1213540227] [2020-08-19 06:55:24,121 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:55:24,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:24,309 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:55:24,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:24,339 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 06:55:24,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:24,352 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 06:55:24,353 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1213540227] [2020-08-19 06:55:24,356 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 06:55:24,356 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-19 06:55:24,357 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [220911941] [2020-08-19 06:55:24,363 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-19 06:55:24,363 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:55:24,375 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-19 06:55:24,376 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-19 06:55:24,379 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 4 states. [2020-08-19 06:55:24,532 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:55:24,532 INFO L93 Difference]: Finished difference Result 59 states and 76 transitions. [2020-08-19 06:55:24,533 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-19 06:55:24,534 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 20 [2020-08-19 06:55:24,535 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:55:24,546 INFO L225 Difference]: With dead ends: 59 [2020-08-19 06:55:24,547 INFO L226 Difference]: Without dead ends: 31 [2020-08-19 06:55:24,551 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-19 06:55:24,570 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-19 06:55:24,592 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 28. [2020-08-19 06:55:24,593 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-19 06:55:24,595 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 32 transitions. [2020-08-19 06:55:24,596 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 32 transitions. Word has length 20 [2020-08-19 06:55:24,597 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:55:24,597 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 32 transitions. [2020-08-19 06:55:24,597 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-19 06:55:24,598 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 32 transitions. [2020-08-19 06:55:24,599 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-19 06:55:24,599 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:55:24,599 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:55:24,600 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-19 06:55:24,600 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:55:24,600 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:55:24,601 INFO L82 PathProgramCache]: Analyzing trace with hash -931069882, now seen corresponding path program 1 times [2020-08-19 06:55:24,601 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:55:24,602 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1193545642] [2020-08-19 06:55:24,602 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:55:24,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:24,676 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:55:24,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:24,697 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 06:55:24,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:24,775 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 06:55:24,776 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1193545642] [2020-08-19 06:55:24,776 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 06:55:24,776 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-08-19 06:55:24,776 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [238347448] [2020-08-19 06:55:24,778 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-19 06:55:24,779 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:55:24,779 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-19 06:55:24,780 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-08-19 06:55:24,780 INFO L87 Difference]: Start difference. First operand 28 states and 32 transitions. Second operand 6 states. [2020-08-19 06:55:25,001 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:55:25,001 INFO L93 Difference]: Finished difference Result 48 states and 56 transitions. [2020-08-19 06:55:25,002 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-19 06:55:25,002 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2020-08-19 06:55:25,002 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:55:25,003 INFO L225 Difference]: With dead ends: 48 [2020-08-19 06:55:25,003 INFO L226 Difference]: Without dead ends: 30 [2020-08-19 06:55:25,005 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2020-08-19 06:55:25,006 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-19 06:55:25,012 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2020-08-19 06:55:25,013 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-19 06:55:25,014 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2020-08-19 06:55:25,014 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 20 [2020-08-19 06:55:25,015 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:55:25,015 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2020-08-19 06:55:25,015 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-19 06:55:25,015 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2020-08-19 06:55:25,016 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-19 06:55:25,016 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:55:25,017 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:55:25,017 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-19 06:55:25,017 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:55:25,018 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:55:25,018 INFO L82 PathProgramCache]: Analyzing trace with hash 1782065480, now seen corresponding path program 1 times [2020-08-19 06:55:25,018 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:55:25,018 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1945053576] [2020-08-19 06:55:25,019 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:55:25,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:25,134 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:55:25,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:25,161 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 06:55:25,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:25,301 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 06:55:25,301 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1945053576] [2020-08-19 06:55:25,302 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:55:25,302 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-19 06:55:25,302 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1768877663] [2020-08-19 06:55:25,303 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-19 06:55:25,303 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:55:25,303 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-19 06:55:25,304 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-08-19 06:55:25,304 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand 7 states. [2020-08-19 06:55:25,481 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:55:25,481 INFO L93 Difference]: Finished difference Result 50 states and 58 transitions. [2020-08-19 06:55:25,482 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-19 06:55:25,482 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 22 [2020-08-19 06:55:25,482 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:55:25,483 INFO L225 Difference]: With dead ends: 50 [2020-08-19 06:55:25,483 INFO L226 Difference]: Without dead ends: 32 [2020-08-19 06:55:25,484 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2020-08-19 06:55:25,485 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-19 06:55:25,490 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2020-08-19 06:55:25,491 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-19 06:55:25,492 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 35 transitions. [2020-08-19 06:55:25,492 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 35 transitions. Word has length 22 [2020-08-19 06:55:25,492 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:55:25,493 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 35 transitions. [2020-08-19 06:55:25,493 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-19 06:55:25,493 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 35 transitions. [2020-08-19 06:55:25,494 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-19 06:55:25,494 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:55:25,494 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:55:25,494 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-19 06:55:25,495 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:55:25,495 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:55:25,495 INFO L82 PathProgramCache]: Analyzing trace with hash 2059999690, now seen corresponding path program 2 times [2020-08-19 06:55:25,496 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:55:25,496 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [218346129] [2020-08-19 06:55:25,496 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:55:25,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:25,542 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:55:25,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:25,558 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 06:55:25,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:25,688 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:55:25,689 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [218346129] [2020-08-19 06:55:25,690 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:55:25,690 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-19 06:55:25,690 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1037414011] [2020-08-19 06:55:25,691 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-19 06:55:25,691 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:55:25,691 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-19 06:55:25,692 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2020-08-19 06:55:25,692 INFO L87 Difference]: Start difference. First operand 31 states and 35 transitions. Second operand 8 states. [2020-08-19 06:55:25,870 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:55:25,871 INFO L93 Difference]: Finished difference Result 52 states and 60 transitions. [2020-08-19 06:55:25,871 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-19 06:55:25,872 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 24 [2020-08-19 06:55:25,872 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:55:25,873 INFO L225 Difference]: With dead ends: 52 [2020-08-19 06:55:25,873 INFO L226 Difference]: Without dead ends: 34 [2020-08-19 06:55:25,874 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2020-08-19 06:55:25,875 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-19 06:55:25,880 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2020-08-19 06:55:25,880 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-19 06:55:25,881 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 37 transitions. [2020-08-19 06:55:25,881 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 37 transitions. Word has length 24 [2020-08-19 06:55:25,882 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:55:25,882 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 37 transitions. [2020-08-19 06:55:25,882 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-19 06:55:25,882 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 37 transitions. [2020-08-19 06:55:25,883 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-19 06:55:25,884 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:55:25,884 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:55:25,884 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-19 06:55:25,885 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:55:25,885 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:55:25,885 INFO L82 PathProgramCache]: Analyzing trace with hash -1428164148, now seen corresponding path program 3 times [2020-08-19 06:55:25,885 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:55:25,886 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2884402] [2020-08-19 06:55:25,886 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:55:25,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:25,932 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:55:25,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:25,948 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 06:55:25,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:26,144 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:55:26,145 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2884402] [2020-08-19 06:55:26,145 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:55:26,146 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-19 06:55:26,146 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [686923402] [2020-08-19 06:55:26,147 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-19 06:55:26,147 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:55:26,147 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-19 06:55:26,148 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-19 06:55:26,148 INFO L87 Difference]: Start difference. First operand 33 states and 37 transitions. Second operand 9 states. [2020-08-19 06:55:26,394 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:55:26,394 INFO L93 Difference]: Finished difference Result 54 states and 62 transitions. [2020-08-19 06:55:26,394 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-19 06:55:26,395 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-08-19 06:55:26,395 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:55:26,396 INFO L225 Difference]: With dead ends: 54 [2020-08-19 06:55:26,396 INFO L226 Difference]: Without dead ends: 36 [2020-08-19 06:55:26,398 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=41, Invalid=91, Unknown=0, NotChecked=0, Total=132 [2020-08-19 06:55:26,399 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-19 06:55:26,405 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2020-08-19 06:55:26,406 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-19 06:55:26,409 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2020-08-19 06:55:26,409 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 26 [2020-08-19 06:55:26,409 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:55:26,409 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2020-08-19 06:55:26,410 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-19 06:55:26,412 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2020-08-19 06:55:26,413 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-19 06:55:26,413 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:55:26,413 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:55:26,413 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-19 06:55:26,413 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:55:26,414 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:55:26,414 INFO L82 PathProgramCache]: Analyzing trace with hash 815845710, now seen corresponding path program 4 times [2020-08-19 06:55:26,416 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:55:26,417 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1147227897] [2020-08-19 06:55:26,417 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:55:26,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:26,491 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:55:26,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:26,507 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 06:55:26,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:26,689 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:55:26,690 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1147227897] [2020-08-19 06:55:26,690 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:55:26,690 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-19 06:55:26,690 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1342287744] [2020-08-19 06:55:26,691 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-19 06:55:26,691 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:55:26,692 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-19 06:55:26,692 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2020-08-19 06:55:26,692 INFO L87 Difference]: Start difference. First operand 35 states and 39 transitions. Second operand 10 states. [2020-08-19 06:55:26,871 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:55:26,871 INFO L93 Difference]: Finished difference Result 56 states and 64 transitions. [2020-08-19 06:55:26,872 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-19 06:55:26,872 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 28 [2020-08-19 06:55:26,872 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:55:26,873 INFO L225 Difference]: With dead ends: 56 [2020-08-19 06:55:26,874 INFO L226 Difference]: Without dead ends: 38 [2020-08-19 06:55:26,874 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=49, Invalid=107, Unknown=0, NotChecked=0, Total=156 [2020-08-19 06:55:26,875 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-19 06:55:26,880 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2020-08-19 06:55:26,881 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-19 06:55:26,882 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 41 transitions. [2020-08-19 06:55:26,883 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 41 transitions. Word has length 28 [2020-08-19 06:55:26,883 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:55:26,883 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 41 transitions. [2020-08-19 06:55:26,883 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-19 06:55:26,883 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 41 transitions. [2020-08-19 06:55:26,886 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-19 06:55:26,886 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:55:26,886 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:55:26,886 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-19 06:55:26,887 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:55:26,887 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:55:26,888 INFO L82 PathProgramCache]: Analyzing trace with hash 1235736656, now seen corresponding path program 5 times [2020-08-19 06:55:26,888 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:55:26,888 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [327060850] [2020-08-19 06:55:26,889 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:55:26,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:26,921 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:55:26,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:26,933 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 06:55:26,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:27,168 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:55:27,168 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [327060850] [2020-08-19 06:55:27,169 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:55:27,169 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-19 06:55:27,169 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1392652810] [2020-08-19 06:55:27,170 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-19 06:55:27,170 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:55:27,170 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-19 06:55:27,171 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2020-08-19 06:55:27,171 INFO L87 Difference]: Start difference. First operand 37 states and 41 transitions. Second operand 11 states. [2020-08-19 06:55:27,371 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:55:27,371 INFO L93 Difference]: Finished difference Result 58 states and 66 transitions. [2020-08-19 06:55:27,372 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-19 06:55:27,372 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 30 [2020-08-19 06:55:27,372 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:55:27,373 INFO L225 Difference]: With dead ends: 58 [2020-08-19 06:55:27,373 INFO L226 Difference]: Without dead ends: 40 [2020-08-19 06:55:27,374 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=58, Invalid=124, Unknown=0, NotChecked=0, Total=182 [2020-08-19 06:55:27,375 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-19 06:55:27,379 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2020-08-19 06:55:27,380 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-19 06:55:27,380 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 43 transitions. [2020-08-19 06:55:27,380 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 43 transitions. Word has length 30 [2020-08-19 06:55:27,381 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:55:27,381 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 43 transitions. [2020-08-19 06:55:27,381 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-19 06:55:27,381 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 43 transitions. [2020-08-19 06:55:27,382 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-19 06:55:27,382 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:55:27,382 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:55:27,383 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-19 06:55:27,383 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:55:27,383 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:55:27,383 INFO L82 PathProgramCache]: Analyzing trace with hash 1024009938, now seen corresponding path program 6 times [2020-08-19 06:55:27,384 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:55:27,384 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1282002520] [2020-08-19 06:55:27,384 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:55:27,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:27,444 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:55:27,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:27,457 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 06:55:27,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:27,743 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 06:55:27,743 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1282002520] [2020-08-19 06:55:27,744 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:55:27,744 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-19 06:55:27,744 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1308491317] [2020-08-19 06:55:27,746 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-19 06:55:27,746 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:55:27,746 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-19 06:55:27,746 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=90, Unknown=0, NotChecked=0, Total=132 [2020-08-19 06:55:27,747 INFO L87 Difference]: Start difference. First operand 39 states and 43 transitions. Second operand 12 states. [2020-08-19 06:55:27,967 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:55:27,968 INFO L93 Difference]: Finished difference Result 60 states and 68 transitions. [2020-08-19 06:55:27,968 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-19 06:55:27,968 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 32 [2020-08-19 06:55:27,969 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:55:27,969 INFO L225 Difference]: With dead ends: 60 [2020-08-19 06:55:27,969 INFO L226 Difference]: Without dead ends: 42 [2020-08-19 06:55:27,971 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=68, Invalid=142, Unknown=0, NotChecked=0, Total=210 [2020-08-19 06:55:27,971 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-19 06:55:27,980 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2020-08-19 06:55:27,981 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-19 06:55:27,982 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 45 transitions. [2020-08-19 06:55:27,982 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 45 transitions. Word has length 32 [2020-08-19 06:55:27,983 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:55:27,983 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 45 transitions. [2020-08-19 06:55:27,983 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-19 06:55:27,983 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 45 transitions. [2020-08-19 06:55:27,984 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-19 06:55:27,984 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:55:27,984 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:55:27,984 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-19 06:55:27,987 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:55:27,987 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:55:27,987 INFO L82 PathProgramCache]: Analyzing trace with hash -581903148, now seen corresponding path program 7 times [2020-08-19 06:55:27,988 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:55:27,990 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1502873532] [2020-08-19 06:55:27,990 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:55:28,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:28,042 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:55:28,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:28,065 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 06:55:28,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:28,413 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:55:28,413 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1502873532] [2020-08-19 06:55:28,413 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:55:28,414 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-19 06:55:28,414 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2022056363] [2020-08-19 06:55:28,414 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-19 06:55:28,415 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:55:28,415 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-19 06:55:28,416 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=105, Unknown=0, NotChecked=0, Total=156 [2020-08-19 06:55:28,416 INFO L87 Difference]: Start difference. First operand 41 states and 45 transitions. Second operand 13 states. [2020-08-19 06:55:28,612 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:55:28,612 INFO L93 Difference]: Finished difference Result 62 states and 70 transitions. [2020-08-19 06:55:28,613 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-19 06:55:28,613 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 34 [2020-08-19 06:55:28,613 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:55:28,614 INFO L225 Difference]: With dead ends: 62 [2020-08-19 06:55:28,614 INFO L226 Difference]: Without dead ends: 44 [2020-08-19 06:55:28,615 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=79, Invalid=161, Unknown=0, NotChecked=0, Total=240 [2020-08-19 06:55:28,615 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-19 06:55:28,619 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2020-08-19 06:55:28,619 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-19 06:55:28,620 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 47 transitions. [2020-08-19 06:55:28,620 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 47 transitions. Word has length 34 [2020-08-19 06:55:28,620 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:55:28,620 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 47 transitions. [2020-08-19 06:55:28,620 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-19 06:55:28,621 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 47 transitions. [2020-08-19 06:55:28,621 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-19 06:55:28,621 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:55:28,622 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:55:28,622 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-19 06:55:28,622 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:55:28,622 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:55:28,622 INFO L82 PathProgramCache]: Analyzing trace with hash -1971119530, now seen corresponding path program 8 times [2020-08-19 06:55:28,623 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:55:28,623 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1047734692] [2020-08-19 06:55:28,623 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:55:28,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:28,658 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:55:28,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:28,669 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 06:55:28,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:29,030 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:55:29,030 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1047734692] [2020-08-19 06:55:29,030 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:55:29,030 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-19 06:55:29,031 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [261220728] [2020-08-19 06:55:29,031 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-19 06:55:29,031 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:55:29,031 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-19 06:55:29,032 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2020-08-19 06:55:29,032 INFO L87 Difference]: Start difference. First operand 43 states and 47 transitions. Second operand 14 states. [2020-08-19 06:55:29,283 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:55:29,283 INFO L93 Difference]: Finished difference Result 64 states and 72 transitions. [2020-08-19 06:55:29,283 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-19 06:55:29,283 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 36 [2020-08-19 06:55:29,284 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:55:29,284 INFO L225 Difference]: With dead ends: 64 [2020-08-19 06:55:29,284 INFO L226 Difference]: Without dead ends: 46 [2020-08-19 06:55:29,285 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=91, Invalid=181, Unknown=0, NotChecked=0, Total=272 [2020-08-19 06:55:29,286 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-19 06:55:29,290 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2020-08-19 06:55:29,290 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-19 06:55:29,291 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 49 transitions. [2020-08-19 06:55:29,291 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 49 transitions. Word has length 36 [2020-08-19 06:55:29,291 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:55:29,292 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 49 transitions. [2020-08-19 06:55:29,292 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-19 06:55:29,292 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 49 transitions. [2020-08-19 06:55:29,293 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-19 06:55:29,293 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:55:29,293 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:55:29,293 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-19 06:55:29,293 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:55:29,294 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:55:29,294 INFO L82 PathProgramCache]: Analyzing trace with hash -1273233576, now seen corresponding path program 9 times [2020-08-19 06:55:29,294 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:55:29,294 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1342070964] [2020-08-19 06:55:29,294 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:55:29,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:29,344 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:55:29,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:29,358 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 06:55:29,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:29,374 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2020-08-19 06:55:29,375 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1342070964] [2020-08-19 06:55:29,375 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 06:55:29,375 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-19 06:55:29,376 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1816298277] [2020-08-19 06:55:29,376 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-19 06:55:29,377 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:55:29,377 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-19 06:55:29,377 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-19 06:55:29,378 INFO L87 Difference]: Start difference. First operand 45 states and 49 transitions. Second operand 5 states. [2020-08-19 06:55:29,477 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:55:29,477 INFO L93 Difference]: Finished difference Result 65 states and 74 transitions. [2020-08-19 06:55:29,478 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-19 06:55:29,478 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 38 [2020-08-19 06:55:29,478 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:55:29,480 INFO L225 Difference]: With dead ends: 65 [2020-08-19 06:55:29,480 INFO L226 Difference]: Without dead ends: 53 [2020-08-19 06:55:29,481 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-19 06:55:29,481 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-08-19 06:55:29,490 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 46. [2020-08-19 06:55:29,490 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-19 06:55:29,491 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 50 transitions. [2020-08-19 06:55:29,491 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 50 transitions. Word has length 38 [2020-08-19 06:55:29,491 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:55:29,491 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 50 transitions. [2020-08-19 06:55:29,492 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-19 06:55:29,492 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 50 transitions. [2020-08-19 06:55:29,492 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-19 06:55:29,492 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:55:29,493 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:55:29,493 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-19 06:55:29,493 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:55:29,493 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:55:29,493 INFO L82 PathProgramCache]: Analyzing trace with hash -1053921041, now seen corresponding path program 1 times [2020-08-19 06:55:29,494 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:55:29,494 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1561845942] [2020-08-19 06:55:29,494 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:55:29,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:29,556 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:55:29,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:29,568 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 06:55:29,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:29,581 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2020-08-19 06:55:29,582 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1561845942] [2020-08-19 06:55:29,582 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:55:29,582 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-19 06:55:29,582 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1897670985] [2020-08-19 06:55:29,583 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-19 06:55:29,583 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:55:29,583 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-19 06:55:29,583 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-08-19 06:55:29,583 INFO L87 Difference]: Start difference. First operand 46 states and 50 transitions. Second operand 6 states. [2020-08-19 06:55:29,675 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:55:29,675 INFO L93 Difference]: Finished difference Result 73 states and 85 transitions. [2020-08-19 06:55:29,675 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-19 06:55:29,675 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 41 [2020-08-19 06:55:29,676 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:55:29,677 INFO L225 Difference]: With dead ends: 73 [2020-08-19 06:55:29,677 INFO L226 Difference]: Without dead ends: 61 [2020-08-19 06:55:29,677 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-08-19 06:55:29,678 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-08-19 06:55:29,682 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 49. [2020-08-19 06:55:29,682 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-19 06:55:29,683 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 54 transitions. [2020-08-19 06:55:29,683 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 54 transitions. Word has length 41 [2020-08-19 06:55:29,684 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:55:29,684 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 54 transitions. [2020-08-19 06:55:29,684 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-19 06:55:29,684 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 54 transitions. [2020-08-19 06:55:29,685 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-19 06:55:29,685 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:55:29,685 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:55:29,685 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-19 06:55:29,685 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:55:29,686 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:55:29,686 INFO L82 PathProgramCache]: Analyzing trace with hash -159448072, now seen corresponding path program 2 times [2020-08-19 06:55:29,686 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:55:29,686 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1264113771] [2020-08-19 06:55:29,686 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:55:29,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:29,734 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:55:29,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:29,746 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 06:55:29,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:29,763 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 83 trivial. 0 not checked. [2020-08-19 06:55:29,763 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1264113771] [2020-08-19 06:55:29,763 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 06:55:29,763 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-19 06:55:29,764 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1092784735] [2020-08-19 06:55:29,764 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-19 06:55:29,764 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:55:29,765 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-19 06:55:29,765 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-19 06:55:29,766 INFO L87 Difference]: Start difference. First operand 49 states and 54 transitions. Second operand 5 states. [2020-08-19 06:55:29,836 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:55:29,837 INFO L93 Difference]: Finished difference Result 69 states and 78 transitions. [2020-08-19 06:55:29,837 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-19 06:55:29,837 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 44 [2020-08-19 06:55:29,837 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:55:29,838 INFO L225 Difference]: With dead ends: 69 [2020-08-19 06:55:29,838 INFO L226 Difference]: Without dead ends: 49 [2020-08-19 06:55:29,842 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-19 06:55:29,842 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-19 06:55:29,848 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-19 06:55:29,849 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-19 06:55:29,849 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 52 transitions. [2020-08-19 06:55:29,849 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 52 transitions. Word has length 44 [2020-08-19 06:55:29,850 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:55:29,851 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 52 transitions. [2020-08-19 06:55:29,851 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-19 06:55:29,851 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 52 transitions. [2020-08-19 06:55:29,852 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-19 06:55:29,852 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:55:29,852 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:55:29,852 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-19 06:55:29,852 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:55:29,853 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:55:29,853 INFO L82 PathProgramCache]: Analyzing trace with hash -1139281096, now seen corresponding path program 1 times [2020-08-19 06:55:29,853 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:55:29,855 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [669880316] [2020-08-19 06:55:29,855 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:55:29,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:29,907 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:55:29,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:29,918 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 06:55:29,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:30,339 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 06:55:30,340 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [669880316] [2020-08-19 06:55:30,340 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:55:30,340 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-19 06:55:30,340 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1315412834] [2020-08-19 06:55:30,341 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-19 06:55:30,341 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:55:30,341 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-19 06:55:30,342 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=138, Unknown=0, NotChecked=0, Total=210 [2020-08-19 06:55:30,342 INFO L87 Difference]: Start difference. First operand 49 states and 52 transitions. Second operand 15 states. [2020-08-19 06:55:30,574 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:55:30,574 INFO L93 Difference]: Finished difference Result 74 states and 80 transitions. [2020-08-19 06:55:30,575 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-19 06:55:30,575 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 44 [2020-08-19 06:55:30,575 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:55:30,576 INFO L225 Difference]: With dead ends: 74 [2020-08-19 06:55:30,576 INFO L226 Difference]: Without dead ends: 52 [2020-08-19 06:55:30,577 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=104, Invalid=202, Unknown=0, NotChecked=0, Total=306 [2020-08-19 06:55:30,578 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-19 06:55:30,587 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2020-08-19 06:55:30,587 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-19 06:55:30,588 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 54 transitions. [2020-08-19 06:55:30,588 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 54 transitions. Word has length 44 [2020-08-19 06:55:30,588 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:55:30,588 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 54 transitions. [2020-08-19 06:55:30,588 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-19 06:55:30,588 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 54 transitions. [2020-08-19 06:55:30,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-19 06:55:30,589 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:55:30,589 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:55:30,589 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-19 06:55:30,589 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:55:30,589 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:55:30,590 INFO L82 PathProgramCache]: Analyzing trace with hash 763672122, now seen corresponding path program 2 times [2020-08-19 06:55:30,590 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:55:30,590 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1849418029] [2020-08-19 06:55:30,590 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:55:30,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:30,622 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:55:30,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:30,634 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 06:55:30,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:31,055 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 06:55:31,056 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1849418029] [2020-08-19 06:55:31,056 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:55:31,056 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-19 06:55:31,056 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1813609251] [2020-08-19 06:55:31,057 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-19 06:55:31,057 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:55:31,057 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-19 06:55:31,058 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=156, Unknown=0, NotChecked=0, Total=240 [2020-08-19 06:55:31,058 INFO L87 Difference]: Start difference. First operand 51 states and 54 transitions. Second operand 16 states. [2020-08-19 06:55:31,301 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:55:31,301 INFO L93 Difference]: Finished difference Result 76 states and 82 transitions. [2020-08-19 06:55:31,301 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-19 06:55:31,301 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 46 [2020-08-19 06:55:31,302 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:55:31,302 INFO L225 Difference]: With dead ends: 76 [2020-08-19 06:55:31,302 INFO L226 Difference]: Without dead ends: 54 [2020-08-19 06:55:31,303 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=118, Invalid=224, Unknown=0, NotChecked=0, Total=342 [2020-08-19 06:55:31,304 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-19 06:55:31,314 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2020-08-19 06:55:31,315 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-19 06:55:31,315 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 56 transitions. [2020-08-19 06:55:31,316 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 56 transitions. Word has length 46 [2020-08-19 06:55:31,316 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:55:31,316 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 56 transitions. [2020-08-19 06:55:31,316 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-19 06:55:31,316 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 56 transitions. [2020-08-19 06:55:31,317 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-19 06:55:31,317 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:55:31,317 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:55:31,317 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-19 06:55:31,318 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:55:31,318 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:55:31,318 INFO L82 PathProgramCache]: Analyzing trace with hash -154353476, now seen corresponding path program 3 times [2020-08-19 06:55:31,318 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:55:31,320 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [972344522] [2020-08-19 06:55:31,320 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:55:31,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:31,359 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:55:31,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:31,370 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 06:55:31,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:31,878 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 06:55:31,878 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [972344522] [2020-08-19 06:55:31,879 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:55:31,879 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-19 06:55:31,879 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2129136395] [2020-08-19 06:55:31,879 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-19 06:55:31,880 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:55:31,880 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-19 06:55:31,880 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=175, Unknown=0, NotChecked=0, Total=272 [2020-08-19 06:55:31,880 INFO L87 Difference]: Start difference. First operand 53 states and 56 transitions. Second operand 17 states. [2020-08-19 06:55:32,092 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:55:32,092 INFO L93 Difference]: Finished difference Result 78 states and 84 transitions. [2020-08-19 06:55:32,093 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-19 06:55:32,093 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 48 [2020-08-19 06:55:32,093 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:55:32,094 INFO L225 Difference]: With dead ends: 78 [2020-08-19 06:55:32,094 INFO L226 Difference]: Without dead ends: 56 [2020-08-19 06:55:32,095 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=133, Invalid=247, Unknown=0, NotChecked=0, Total=380 [2020-08-19 06:55:32,095 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-08-19 06:55:32,098 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2020-08-19 06:55:32,098 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-19 06:55:32,099 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 58 transitions. [2020-08-19 06:55:32,099 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 58 transitions. Word has length 48 [2020-08-19 06:55:32,099 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:55:32,099 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 58 transitions. [2020-08-19 06:55:32,099 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-19 06:55:32,099 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 58 transitions. [2020-08-19 06:55:32,100 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-19 06:55:32,100 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:55:32,100 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:55:32,100 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-19 06:55:32,101 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:55:32,101 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:55:32,101 INFO L82 PathProgramCache]: Analyzing trace with hash -1908657474, now seen corresponding path program 4 times [2020-08-19 06:55:32,101 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:55:32,101 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [387121398] [2020-08-19 06:55:32,101 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:55:32,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:32,134 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:55:32,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:32,152 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 06:55:32,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:32,644 INFO L134 CoverageAnalysis]: Checked inductivity of 149 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 06:55:32,645 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [387121398] [2020-08-19 06:55:32,645 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:55:32,645 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-19 06:55:32,645 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [325837878] [2020-08-19 06:55:32,646 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-19 06:55:32,646 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:55:32,646 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-19 06:55:32,647 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=195, Unknown=0, NotChecked=0, Total=306 [2020-08-19 06:55:32,647 INFO L87 Difference]: Start difference. First operand 55 states and 58 transitions. Second operand 18 states. [2020-08-19 06:55:32,900 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:55:32,900 INFO L93 Difference]: Finished difference Result 80 states and 86 transitions. [2020-08-19 06:55:32,901 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-19 06:55:32,901 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 50 [2020-08-19 06:55:32,901 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:55:32,902 INFO L225 Difference]: With dead ends: 80 [2020-08-19 06:55:32,902 INFO L226 Difference]: Without dead ends: 58 [2020-08-19 06:55:32,903 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=149, Invalid=271, Unknown=0, NotChecked=0, Total=420 [2020-08-19 06:55:32,906 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-19 06:55:32,910 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2020-08-19 06:55:32,911 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-19 06:55:32,912 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 60 transitions. [2020-08-19 06:55:32,913 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 60 transitions. Word has length 50 [2020-08-19 06:55:32,913 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:55:32,913 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 60 transitions. [2020-08-19 06:55:32,913 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-19 06:55:32,913 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 60 transitions. [2020-08-19 06:55:32,914 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-19 06:55:32,914 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:55:32,914 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:55:32,914 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-19 06:55:32,914 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:55:32,915 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:55:32,915 INFO L82 PathProgramCache]: Analyzing trace with hash 127347776, now seen corresponding path program 5 times [2020-08-19 06:55:32,915 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:55:32,915 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1054611633] [2020-08-19 06:55:32,915 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:55:32,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:32,965 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:55:32,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:32,977 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 06:55:33,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:33,572 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 06:55:33,572 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1054611633] [2020-08-19 06:55:33,573 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:55:33,573 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-19 06:55:33,573 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1039139595] [2020-08-19 06:55:33,574 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-19 06:55:33,574 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:55:33,574 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-19 06:55:33,574 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=216, Unknown=0, NotChecked=0, Total=342 [2020-08-19 06:55:33,575 INFO L87 Difference]: Start difference. First operand 57 states and 60 transitions. Second operand 19 states. [2020-08-19 06:55:33,844 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:55:33,845 INFO L93 Difference]: Finished difference Result 82 states and 88 transitions. [2020-08-19 06:55:33,845 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-19 06:55:33,845 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 52 [2020-08-19 06:55:33,846 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:55:33,846 INFO L225 Difference]: With dead ends: 82 [2020-08-19 06:55:33,847 INFO L226 Difference]: Without dead ends: 60 [2020-08-19 06:55:33,848 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=166, Invalid=296, Unknown=0, NotChecked=0, Total=462 [2020-08-19 06:55:33,849 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-08-19 06:55:33,852 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 59. [2020-08-19 06:55:33,852 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-08-19 06:55:33,853 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 62 transitions. [2020-08-19 06:55:33,853 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 62 transitions. Word has length 52 [2020-08-19 06:55:33,853 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:55:33,853 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 62 transitions. [2020-08-19 06:55:33,854 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-19 06:55:33,854 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 62 transitions. [2020-08-19 06:55:33,854 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-19 06:55:33,854 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:55:33,854 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:55:33,855 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-19 06:55:33,855 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:55:33,855 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:55:33,855 INFO L82 PathProgramCache]: Analyzing trace with hash -1776693950, now seen corresponding path program 6 times [2020-08-19 06:55:33,855 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:55:33,856 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [722000441] [2020-08-19 06:55:33,856 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:55:33,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:33,898 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:55:33,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:33,909 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 06:55:33,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:34,548 INFO L134 CoverageAnalysis]: Checked inductivity of 201 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 06:55:34,548 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [722000441] [2020-08-19 06:55:34,549 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:55:34,549 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-19 06:55:34,549 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1223923361] [2020-08-19 06:55:34,549 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-19 06:55:34,550 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:55:34,550 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-19 06:55:34,550 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=142, Invalid=238, Unknown=0, NotChecked=0, Total=380 [2020-08-19 06:55:34,550 INFO L87 Difference]: Start difference. First operand 59 states and 62 transitions. Second operand 20 states. [2020-08-19 06:55:34,839 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:55:34,839 INFO L93 Difference]: Finished difference Result 84 states and 90 transitions. [2020-08-19 06:55:34,846 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-19 06:55:34,846 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 54 [2020-08-19 06:55:34,846 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:55:34,847 INFO L225 Difference]: With dead ends: 84 [2020-08-19 06:55:34,847 INFO L226 Difference]: Without dead ends: 62 [2020-08-19 06:55:34,848 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=184, Invalid=322, Unknown=0, NotChecked=0, Total=506 [2020-08-19 06:55:34,848 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-08-19 06:55:34,851 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2020-08-19 06:55:34,851 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-08-19 06:55:34,852 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 64 transitions. [2020-08-19 06:55:34,852 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 64 transitions. Word has length 54 [2020-08-19 06:55:34,852 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:55:34,852 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 64 transitions. [2020-08-19 06:55:34,852 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-19 06:55:34,853 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 64 transitions. [2020-08-19 06:55:34,853 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-19 06:55:34,853 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:55:34,853 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:55:34,854 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-19 06:55:34,854 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:55:34,854 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:55:34,854 INFO L82 PathProgramCache]: Analyzing trace with hash -1904724540, now seen corresponding path program 7 times [2020-08-19 06:55:34,854 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:55:34,855 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [132916288] [2020-08-19 06:55:34,855 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:55:34,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:34,899 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:55:34,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:34,908 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 06:55:34,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:35,743 INFO L134 CoverageAnalysis]: Checked inductivity of 230 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 06:55:35,743 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [132916288] [2020-08-19 06:55:35,744 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:55:35,744 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-19 06:55:35,744 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1803247374] [2020-08-19 06:55:35,745 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-19 06:55:35,745 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:55:35,745 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-19 06:55:35,746 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=159, Invalid=261, Unknown=0, NotChecked=0, Total=420 [2020-08-19 06:55:35,746 INFO L87 Difference]: Start difference. First operand 61 states and 64 transitions. Second operand 21 states. [2020-08-19 06:55:36,038 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:55:36,038 INFO L93 Difference]: Finished difference Result 86 states and 92 transitions. [2020-08-19 06:55:36,039 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-19 06:55:36,039 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 56 [2020-08-19 06:55:36,039 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:55:36,040 INFO L225 Difference]: With dead ends: 86 [2020-08-19 06:55:36,040 INFO L226 Difference]: Without dead ends: 64 [2020-08-19 06:55:36,041 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=203, Invalid=349, Unknown=0, NotChecked=0, Total=552 [2020-08-19 06:55:36,041 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-08-19 06:55:36,045 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2020-08-19 06:55:36,045 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2020-08-19 06:55:36,045 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 66 transitions. [2020-08-19 06:55:36,046 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 66 transitions. Word has length 56 [2020-08-19 06:55:36,046 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:55:36,046 INFO L479 AbstractCegarLoop]: Abstraction has 63 states and 66 transitions. [2020-08-19 06:55:36,046 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-19 06:55:36,046 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 66 transitions. [2020-08-19 06:55:36,047 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-08-19 06:55:36,047 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:55:36,047 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:55:36,047 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-19 06:55:36,048 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:55:36,048 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:55:36,048 INFO L82 PathProgramCache]: Analyzing trace with hash -388069946, now seen corresponding path program 8 times [2020-08-19 06:55:36,048 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:55:36,048 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [16974111] [2020-08-19 06:55:36,049 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:55:36,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:36,165 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:55:36,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:36,184 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 06:55:36,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:36,998 INFO L134 CoverageAnalysis]: Checked inductivity of 261 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 06:55:36,998 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [16974111] [2020-08-19 06:55:36,999 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:55:36,999 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-19 06:55:36,999 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2049201698] [2020-08-19 06:55:36,999 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-19 06:55:37,000 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:55:37,000 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-19 06:55:37,000 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=177, Invalid=285, Unknown=0, NotChecked=0, Total=462 [2020-08-19 06:55:37,000 INFO L87 Difference]: Start difference. First operand 63 states and 66 transitions. Second operand 22 states. [2020-08-19 06:55:37,328 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:55:37,328 INFO L93 Difference]: Finished difference Result 88 states and 94 transitions. [2020-08-19 06:55:37,328 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-19 06:55:37,328 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 58 [2020-08-19 06:55:37,329 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:55:37,329 INFO L225 Difference]: With dead ends: 88 [2020-08-19 06:55:37,330 INFO L226 Difference]: Without dead ends: 66 [2020-08-19 06:55:37,331 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=223, Invalid=377, Unknown=0, NotChecked=0, Total=600 [2020-08-19 06:55:37,331 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-08-19 06:55:37,335 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2020-08-19 06:55:37,335 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-08-19 06:55:37,335 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 68 transitions. [2020-08-19 06:55:37,335 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 68 transitions. Word has length 58 [2020-08-19 06:55:37,336 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:55:37,336 INFO L479 AbstractCegarLoop]: Abstraction has 65 states and 68 transitions. [2020-08-19 06:55:37,336 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-19 06:55:37,336 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 68 transitions. [2020-08-19 06:55:37,336 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2020-08-19 06:55:37,337 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:55:37,337 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:55:37,337 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-19 06:55:37,337 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:55:37,337 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:55:37,337 INFO L82 PathProgramCache]: Analyzing trace with hash 1123081544, now seen corresponding path program 9 times [2020-08-19 06:55:37,338 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:55:37,338 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1153769177] [2020-08-19 06:55:37,338 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:55:37,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:37,380 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:55:37,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:37,391 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 06:55:37,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:38,190 INFO L134 CoverageAnalysis]: Checked inductivity of 294 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 06:55:38,190 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1153769177] [2020-08-19 06:55:38,190 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:55:38,191 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-19 06:55:38,191 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1509195998] [2020-08-19 06:55:38,191 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-19 06:55:38,191 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:55:38,192 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-19 06:55:38,192 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=196, Invalid=310, Unknown=0, NotChecked=0, Total=506 [2020-08-19 06:55:38,192 INFO L87 Difference]: Start difference. First operand 65 states and 68 transitions. Second operand 23 states. [2020-08-19 06:55:38,503 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:55:38,504 INFO L93 Difference]: Finished difference Result 90 states and 96 transitions. [2020-08-19 06:55:38,506 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-19 06:55:38,507 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 60 [2020-08-19 06:55:38,507 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:55:38,508 INFO L225 Difference]: With dead ends: 90 [2020-08-19 06:55:38,508 INFO L226 Difference]: Without dead ends: 68 [2020-08-19 06:55:38,509 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=244, Invalid=406, Unknown=0, NotChecked=0, Total=650 [2020-08-19 06:55:38,509 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-08-19 06:55:38,513 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 67. [2020-08-19 06:55:38,513 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-08-19 06:55:38,513 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 70 transitions. [2020-08-19 06:55:38,514 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 70 transitions. Word has length 60 [2020-08-19 06:55:38,514 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:55:38,514 INFO L479 AbstractCegarLoop]: Abstraction has 67 states and 70 transitions. [2020-08-19 06:55:38,514 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-19 06:55:38,514 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 70 transitions. [2020-08-19 06:55:38,515 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2020-08-19 06:55:38,515 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:55:38,515 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:55:38,515 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-19 06:55:38,515 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:55:38,516 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:55:38,516 INFO L82 PathProgramCache]: Analyzing trace with hash 1640717386, now seen corresponding path program 10 times [2020-08-19 06:55:38,516 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:55:38,516 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1924108576] [2020-08-19 06:55:38,516 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:55:38,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:38,563 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:55:38,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:38,573 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 06:55:38,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:39,535 INFO L134 CoverageAnalysis]: Checked inductivity of 329 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 06:55:39,539 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1924108576] [2020-08-19 06:55:39,540 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:55:39,540 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-19 06:55:39,540 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1423813697] [2020-08-19 06:55:39,540 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-19 06:55:39,542 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:55:39,543 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-19 06:55:39,543 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=216, Invalid=336, Unknown=0, NotChecked=0, Total=552 [2020-08-19 06:55:39,543 INFO L87 Difference]: Start difference. First operand 67 states and 70 transitions. Second operand 24 states. [2020-08-19 06:55:39,801 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:55:39,801 INFO L93 Difference]: Finished difference Result 92 states and 98 transitions. [2020-08-19 06:55:39,802 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-19 06:55:39,802 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 62 [2020-08-19 06:55:39,802 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:55:39,803 INFO L225 Difference]: With dead ends: 92 [2020-08-19 06:55:39,803 INFO L226 Difference]: Without dead ends: 70 [2020-08-19 06:55:39,804 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=266, Invalid=436, Unknown=0, NotChecked=0, Total=702 [2020-08-19 06:55:39,805 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-08-19 06:55:39,808 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 69. [2020-08-19 06:55:39,808 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2020-08-19 06:55:39,809 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 72 transitions. [2020-08-19 06:55:39,809 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 72 transitions. Word has length 62 [2020-08-19 06:55:39,809 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:55:39,809 INFO L479 AbstractCegarLoop]: Abstraction has 69 states and 72 transitions. [2020-08-19 06:55:39,809 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-19 06:55:39,809 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 72 transitions. [2020-08-19 06:55:39,810 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2020-08-19 06:55:39,810 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:55:39,810 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:55:39,810 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-19 06:55:39,811 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:55:39,811 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:55:39,811 INFO L82 PathProgramCache]: Analyzing trace with hash 872555212, now seen corresponding path program 11 times [2020-08-19 06:55:39,811 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:55:39,811 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1633357272] [2020-08-19 06:55:39,812 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:55:39,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:39,864 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:55:39,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:39,874 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 06:55:39,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:40,788 INFO L134 CoverageAnalysis]: Checked inductivity of 366 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 06:55:40,788 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1633357272] [2020-08-19 06:55:40,788 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:55:40,788 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-19 06:55:40,788 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [155434513] [2020-08-19 06:55:40,789 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-19 06:55:40,789 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:55:40,789 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-19 06:55:40,789 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=237, Invalid=363, Unknown=0, NotChecked=0, Total=600 [2020-08-19 06:55:40,789 INFO L87 Difference]: Start difference. First operand 69 states and 72 transitions. Second operand 25 states. [2020-08-19 06:55:41,134 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:55:41,134 INFO L93 Difference]: Finished difference Result 94 states and 100 transitions. [2020-08-19 06:55:41,135 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-19 06:55:41,135 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 64 [2020-08-19 06:55:41,135 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:55:41,136 INFO L225 Difference]: With dead ends: 94 [2020-08-19 06:55:41,136 INFO L226 Difference]: Without dead ends: 72 [2020-08-19 06:55:41,138 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=289, Invalid=467, Unknown=0, NotChecked=0, Total=756 [2020-08-19 06:55:41,138 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-08-19 06:55:41,142 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 71. [2020-08-19 06:55:41,142 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-08-19 06:55:41,143 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 74 transitions. [2020-08-19 06:55:41,143 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 74 transitions. Word has length 64 [2020-08-19 06:55:41,143 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:55:41,143 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 74 transitions. [2020-08-19 06:55:41,144 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-19 06:55:41,144 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 74 transitions. [2020-08-19 06:55:41,144 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2020-08-19 06:55:41,144 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:55:41,144 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:55:41,145 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-19 06:55:41,145 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:55:41,145 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:55:41,145 INFO L82 PathProgramCache]: Analyzing trace with hash 1403080910, now seen corresponding path program 12 times [2020-08-19 06:55:41,145 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:55:41,146 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2107683574] [2020-08-19 06:55:41,146 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:55:41,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:41,193 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:55:41,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:41,209 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 06:55:41,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:42,187 INFO L134 CoverageAnalysis]: Checked inductivity of 405 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 06:55:42,187 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2107683574] [2020-08-19 06:55:42,187 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:55:42,187 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-19 06:55:42,187 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1250694596] [2020-08-19 06:55:42,188 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-19 06:55:42,188 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:55:42,188 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-19 06:55:42,188 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=259, Invalid=391, Unknown=0, NotChecked=0, Total=650 [2020-08-19 06:55:42,189 INFO L87 Difference]: Start difference. First operand 71 states and 74 transitions. Second operand 26 states. [2020-08-19 06:55:42,554 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:55:42,554 INFO L93 Difference]: Finished difference Result 96 states and 102 transitions. [2020-08-19 06:55:42,557 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-19 06:55:42,557 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 66 [2020-08-19 06:55:42,558 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:55:42,559 INFO L225 Difference]: With dead ends: 96 [2020-08-19 06:55:42,559 INFO L226 Difference]: Without dead ends: 74 [2020-08-19 06:55:42,560 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=313, Invalid=499, Unknown=0, NotChecked=0, Total=812 [2020-08-19 06:55:42,560 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2020-08-19 06:55:42,563 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 73. [2020-08-19 06:55:42,564 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-08-19 06:55:42,564 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 76 transitions. [2020-08-19 06:55:42,564 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 76 transitions. Word has length 66 [2020-08-19 06:55:42,565 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:55:42,565 INFO L479 AbstractCegarLoop]: Abstraction has 73 states and 76 transitions. [2020-08-19 06:55:42,565 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-19 06:55:42,565 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 76 transitions. [2020-08-19 06:55:42,566 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-08-19 06:55:42,566 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:55:42,566 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:55:42,566 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-19 06:55:42,566 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:55:42,566 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:55:42,567 INFO L82 PathProgramCache]: Analyzing trace with hash 137168464, now seen corresponding path program 13 times [2020-08-19 06:55:42,567 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:55:42,567 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1160414362] [2020-08-19 06:55:42,567 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:55:42,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:42,620 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:55:42,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:42,632 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 06:55:42,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:43,836 INFO L134 CoverageAnalysis]: Checked inductivity of 446 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 06:55:43,836 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1160414362] [2020-08-19 06:55:43,836 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:55:43,836 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-19 06:55:43,836 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [160334055] [2020-08-19 06:55:43,837 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-19 06:55:43,837 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:55:43,837 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-19 06:55:43,838 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=282, Invalid=420, Unknown=0, NotChecked=0, Total=702 [2020-08-19 06:55:43,838 INFO L87 Difference]: Start difference. First operand 73 states and 76 transitions. Second operand 27 states. [2020-08-19 06:55:44,077 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:55:44,077 INFO L93 Difference]: Finished difference Result 98 states and 104 transitions. [2020-08-19 06:55:44,078 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-19 06:55:44,078 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 68 [2020-08-19 06:55:44,078 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:55:44,079 INFO L225 Difference]: With dead ends: 98 [2020-08-19 06:55:44,079 INFO L226 Difference]: Without dead ends: 76 [2020-08-19 06:55:44,080 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=338, Invalid=532, Unknown=0, NotChecked=0, Total=870 [2020-08-19 06:55:44,080 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-08-19 06:55:44,083 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 75. [2020-08-19 06:55:44,083 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2020-08-19 06:55:44,084 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 78 transitions. [2020-08-19 06:55:44,084 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 78 transitions. Word has length 68 [2020-08-19 06:55:44,084 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:55:44,084 INFO L479 AbstractCegarLoop]: Abstraction has 75 states and 78 transitions. [2020-08-19 06:55:44,084 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-19 06:55:44,085 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 78 transitions. [2020-08-19 06:55:44,085 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2020-08-19 06:55:44,085 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:55:44,085 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:55:44,085 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-19 06:55:44,086 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:55:44,086 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:55:44,086 INFO L82 PathProgramCache]: Analyzing trace with hash -928947374, now seen corresponding path program 14 times [2020-08-19 06:55:44,086 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:55:44,086 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [659672933] [2020-08-19 06:55:44,086 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:55:44,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:44,133 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:55:44,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:44,145 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 06:55:44,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:45,327 INFO L134 CoverageAnalysis]: Checked inductivity of 489 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 06:55:45,328 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [659672933] [2020-08-19 06:55:45,328 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:55:45,328 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-19 06:55:45,328 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [358441025] [2020-08-19 06:55:45,329 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-19 06:55:45,329 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:55:45,329 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-19 06:55:45,329 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=306, Invalid=450, Unknown=0, NotChecked=0, Total=756 [2020-08-19 06:55:45,329 INFO L87 Difference]: Start difference. First operand 75 states and 78 transitions. Second operand 28 states. [2020-08-19 06:55:45,674 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:55:45,675 INFO L93 Difference]: Finished difference Result 100 states and 106 transitions. [2020-08-19 06:55:45,675 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-19 06:55:45,675 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 70 [2020-08-19 06:55:45,676 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:55:45,676 INFO L225 Difference]: With dead ends: 100 [2020-08-19 06:55:45,676 INFO L226 Difference]: Without dead ends: 78 [2020-08-19 06:55:45,677 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=364, Invalid=566, Unknown=0, NotChecked=0, Total=930 [2020-08-19 06:55:45,677 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-08-19 06:55:45,680 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 77. [2020-08-19 06:55:45,681 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2020-08-19 06:55:45,681 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 80 transitions. [2020-08-19 06:55:45,681 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 80 transitions. Word has length 70 [2020-08-19 06:55:45,681 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:55:45,682 INFO L479 AbstractCegarLoop]: Abstraction has 77 states and 80 transitions. [2020-08-19 06:55:45,682 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-19 06:55:45,682 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 80 transitions. [2020-08-19 06:55:45,682 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2020-08-19 06:55:45,682 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:55:45,683 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:55:45,683 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-19 06:55:45,683 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:55:45,683 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:55:45,683 INFO L82 PathProgramCache]: Analyzing trace with hash 1030916052, now seen corresponding path program 15 times [2020-08-19 06:55:45,683 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:55:45,684 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1125689140] [2020-08-19 06:55:45,684 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:55:45,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:45,736 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:55:45,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:45,747 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 06:55:45,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:46,983 INFO L134 CoverageAnalysis]: Checked inductivity of 534 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 06:55:46,983 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1125689140] [2020-08-19 06:55:46,983 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:55:46,983 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-19 06:55:46,984 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1904808560] [2020-08-19 06:55:46,984 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-19 06:55:46,984 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:55:46,984 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-19 06:55:46,985 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=331, Invalid=481, Unknown=0, NotChecked=0, Total=812 [2020-08-19 06:55:46,985 INFO L87 Difference]: Start difference. First operand 77 states and 80 transitions. Second operand 29 states. [2020-08-19 06:55:47,382 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:55:47,382 INFO L93 Difference]: Finished difference Result 102 states and 108 transitions. [2020-08-19 06:55:47,382 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-19 06:55:47,382 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 72 [2020-08-19 06:55:47,383 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:55:47,383 INFO L225 Difference]: With dead ends: 102 [2020-08-19 06:55:47,384 INFO L226 Difference]: Without dead ends: 80 [2020-08-19 06:55:47,385 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=391, Invalid=601, Unknown=0, NotChecked=0, Total=992 [2020-08-19 06:55:47,385 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-08-19 06:55:47,388 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 79. [2020-08-19 06:55:47,389 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-08-19 06:55:47,389 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 82 transitions. [2020-08-19 06:55:47,389 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 82 transitions. Word has length 72 [2020-08-19 06:55:47,390 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:55:47,390 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 82 transitions. [2020-08-19 06:55:47,390 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-19 06:55:47,390 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 82 transitions. [2020-08-19 06:55:47,391 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2020-08-19 06:55:47,391 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:55:47,391 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:55:47,391 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-19 06:55:47,391 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:55:47,391 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:55:47,392 INFO L82 PathProgramCache]: Analyzing trace with hash -1030974506, now seen corresponding path program 16 times [2020-08-19 06:55:47,392 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:55:47,392 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1414891908] [2020-08-19 06:55:47,392 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:55:47,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:47,442 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:55:47,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:47,453 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 06:55:47,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:48,700 INFO L134 CoverageAnalysis]: Checked inductivity of 581 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 06:55:48,700 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1414891908] [2020-08-19 06:55:48,700 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:55:48,700 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-19 06:55:48,700 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2049600197] [2020-08-19 06:55:48,701 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-19 06:55:48,701 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:55:48,701 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-19 06:55:48,701 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=357, Invalid=513, Unknown=0, NotChecked=0, Total=870 [2020-08-19 06:55:48,702 INFO L87 Difference]: Start difference. First operand 79 states and 82 transitions. Second operand 30 states. [2020-08-19 06:55:48,988 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:55:48,988 INFO L93 Difference]: Finished difference Result 104 states and 110 transitions. [2020-08-19 06:55:48,989 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-19 06:55:48,989 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 74 [2020-08-19 06:55:48,989 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:55:48,990 INFO L225 Difference]: With dead ends: 104 [2020-08-19 06:55:48,990 INFO L226 Difference]: Without dead ends: 82 [2020-08-19 06:55:48,991 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=419, Invalid=637, Unknown=0, NotChecked=0, Total=1056 [2020-08-19 06:55:48,992 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-08-19 06:55:48,995 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 81. [2020-08-19 06:55:48,995 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2020-08-19 06:55:48,995 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 84 transitions. [2020-08-19 06:55:48,995 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 84 transitions. Word has length 74 [2020-08-19 06:55:48,996 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:55:48,996 INFO L479 AbstractCegarLoop]: Abstraction has 81 states and 84 transitions. [2020-08-19 06:55:48,996 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-19 06:55:48,996 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 84 transitions. [2020-08-19 06:55:48,997 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2020-08-19 06:55:48,997 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:55:48,997 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:55:48,997 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-19 06:55:48,997 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:55:48,997 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:55:48,998 INFO L82 PathProgramCache]: Analyzing trace with hash 1767090008, now seen corresponding path program 17 times [2020-08-19 06:55:48,998 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:55:48,998 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [649016063] [2020-08-19 06:55:48,998 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:55:49,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:49,046 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:55:49,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:49,059 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 06:55:49,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:50,422 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 625 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 06:55:50,422 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [649016063] [2020-08-19 06:55:50,423 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:55:50,423 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-19 06:55:50,423 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [453518065] [2020-08-19 06:55:50,423 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-19 06:55:50,423 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:55:50,424 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-19 06:55:50,424 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=384, Invalid=546, Unknown=0, NotChecked=0, Total=930 [2020-08-19 06:55:50,424 INFO L87 Difference]: Start difference. First operand 81 states and 84 transitions. Second operand 31 states. [2020-08-19 06:55:50,844 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:55:50,844 INFO L93 Difference]: Finished difference Result 106 states and 112 transitions. [2020-08-19 06:55:50,845 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-19 06:55:50,845 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 76 [2020-08-19 06:55:50,845 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:55:50,846 INFO L225 Difference]: With dead ends: 106 [2020-08-19 06:55:50,846 INFO L226 Difference]: Without dead ends: 84 [2020-08-19 06:55:50,848 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=448, Invalid=674, Unknown=0, NotChecked=0, Total=1122 [2020-08-19 06:55:50,848 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2020-08-19 06:55:50,852 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 83. [2020-08-19 06:55:50,852 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2020-08-19 06:55:50,853 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 86 transitions. [2020-08-19 06:55:50,853 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 86 transitions. Word has length 76 [2020-08-19 06:55:50,853 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:55:50,853 INFO L479 AbstractCegarLoop]: Abstraction has 83 states and 86 transitions. [2020-08-19 06:55:50,853 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-19 06:55:50,854 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 86 transitions. [2020-08-19 06:55:50,854 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-08-19 06:55:50,854 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:55:50,854 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:55:50,855 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-19 06:55:50,855 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:55:50,855 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:55:50,855 INFO L82 PathProgramCache]: Analyzing trace with hash 2057560666, now seen corresponding path program 18 times [2020-08-19 06:55:50,855 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:55:50,856 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1736275601] [2020-08-19 06:55:50,856 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:55:50,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:50,916 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:55:50,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:50,926 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 06:55:50,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:52,422 INFO L134 CoverageAnalysis]: Checked inductivity of 681 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 06:55:52,422 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1736275601] [2020-08-19 06:55:52,423 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:55:52,423 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-19 06:55:52,423 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2038660411] [2020-08-19 06:55:52,424 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-19 06:55:52,424 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:55:52,424 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-19 06:55:52,425 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=412, Invalid=580, Unknown=0, NotChecked=0, Total=992 [2020-08-19 06:55:52,425 INFO L87 Difference]: Start difference. First operand 83 states and 86 transitions. Second operand 32 states. [2020-08-19 06:55:52,857 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:55:52,857 INFO L93 Difference]: Finished difference Result 108 states and 114 transitions. [2020-08-19 06:55:52,858 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-19 06:55:52,858 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 78 [2020-08-19 06:55:52,858 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:55:52,859 INFO L225 Difference]: With dead ends: 108 [2020-08-19 06:55:52,859 INFO L226 Difference]: Without dead ends: 86 [2020-08-19 06:55:52,860 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=478, Invalid=712, Unknown=0, NotChecked=0, Total=1190 [2020-08-19 06:55:52,861 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2020-08-19 06:55:52,864 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 85. [2020-08-19 06:55:52,864 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2020-08-19 06:55:52,865 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 88 transitions. [2020-08-19 06:55:52,865 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 88 transitions. Word has length 78 [2020-08-19 06:55:52,865 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:55:52,865 INFO L479 AbstractCegarLoop]: Abstraction has 85 states and 88 transitions. [2020-08-19 06:55:52,865 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-19 06:55:52,866 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 88 transitions. [2020-08-19 06:55:52,866 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2020-08-19 06:55:52,866 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:55:52,866 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:55:52,867 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-19 06:55:52,867 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:55:52,867 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:55:52,867 INFO L82 PathProgramCache]: Analyzing trace with hash 2026988764, now seen corresponding path program 19 times [2020-08-19 06:55:52,867 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:55:52,867 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [587366179] [2020-08-19 06:55:52,867 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:55:52,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:52,921 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:55:52,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:52,932 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 06:55:52,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:54,465 INFO L134 CoverageAnalysis]: Checked inductivity of 734 backedges. 0 proven. 729 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 06:55:54,466 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [587366179] [2020-08-19 06:55:54,466 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:55:54,466 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-19 06:55:54,467 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [542855371] [2020-08-19 06:55:54,467 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-19 06:55:54,467 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:55:54,467 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-19 06:55:54,468 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=441, Invalid=615, Unknown=0, NotChecked=0, Total=1056 [2020-08-19 06:55:54,468 INFO L87 Difference]: Start difference. First operand 85 states and 88 transitions. Second operand 33 states. [2020-08-19 06:55:54,951 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:55:54,952 INFO L93 Difference]: Finished difference Result 110 states and 116 transitions. [2020-08-19 06:55:54,952 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-19 06:55:54,952 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 80 [2020-08-19 06:55:54,953 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:55:54,954 INFO L225 Difference]: With dead ends: 110 [2020-08-19 06:55:54,954 INFO L226 Difference]: Without dead ends: 88 [2020-08-19 06:55:54,955 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=509, Invalid=751, Unknown=0, NotChecked=0, Total=1260 [2020-08-19 06:55:54,956 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-08-19 06:55:54,959 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 87. [2020-08-19 06:55:54,959 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2020-08-19 06:55:54,960 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 90 transitions. [2020-08-19 06:55:54,960 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 90 transitions. Word has length 80 [2020-08-19 06:55:54,960 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:55:54,960 INFO L479 AbstractCegarLoop]: Abstraction has 87 states and 90 transitions. [2020-08-19 06:55:54,961 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-19 06:55:54,961 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 90 transitions. [2020-08-19 06:55:54,961 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2020-08-19 06:55:54,961 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:55:54,962 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:55:54,962 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-19 06:55:54,962 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:55:54,962 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:55:54,962 INFO L82 PathProgramCache]: Analyzing trace with hash -1582805282, now seen corresponding path program 20 times [2020-08-19 06:55:54,963 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:55:54,963 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1343598671] [2020-08-19 06:55:54,963 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:55:54,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:55,024 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:55:55,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:55,035 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 06:55:55,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:56,624 INFO L134 CoverageAnalysis]: Checked inductivity of 789 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 06:55:56,624 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1343598671] [2020-08-19 06:55:56,624 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:55:56,624 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-19 06:55:56,624 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1819289290] [2020-08-19 06:55:56,625 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-19 06:55:56,625 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:55:56,625 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-19 06:55:56,626 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=471, Invalid=651, Unknown=0, NotChecked=0, Total=1122 [2020-08-19 06:55:56,626 INFO L87 Difference]: Start difference. First operand 87 states and 90 transitions. Second operand 34 states. [2020-08-19 06:55:57,092 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:55:57,092 INFO L93 Difference]: Finished difference Result 112 states and 118 transitions. [2020-08-19 06:55:57,093 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-19 06:55:57,093 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 82 [2020-08-19 06:55:57,093 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:55:57,094 INFO L225 Difference]: With dead ends: 112 [2020-08-19 06:55:57,094 INFO L226 Difference]: Without dead ends: 90 [2020-08-19 06:55:57,095 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=541, Invalid=791, Unknown=0, NotChecked=0, Total=1332 [2020-08-19 06:55:57,095 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2020-08-19 06:55:57,102 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 89. [2020-08-19 06:55:57,102 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2020-08-19 06:55:57,105 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 92 transitions. [2020-08-19 06:55:57,105 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 92 transitions. Word has length 82 [2020-08-19 06:55:57,105 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:55:57,105 INFO L479 AbstractCegarLoop]: Abstraction has 89 states and 92 transitions. [2020-08-19 06:55:57,105 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-19 06:55:57,106 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 92 transitions. [2020-08-19 06:55:57,107 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2020-08-19 06:55:57,107 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:55:57,107 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:55:57,107 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-19 06:55:57,108 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:55:57,108 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:55:57,108 INFO L82 PathProgramCache]: Analyzing trace with hash -261308320, now seen corresponding path program 21 times [2020-08-19 06:55:57,108 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:55:57,108 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1763718454] [2020-08-19 06:55:57,109 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:55:57,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:57,160 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:55:57,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:57,171 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 06:55:57,187 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:58,834 INFO L134 CoverageAnalysis]: Checked inductivity of 846 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 06:55:58,834 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1763718454] [2020-08-19 06:55:58,834 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:55:58,834 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-19 06:55:58,834 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [332996276] [2020-08-19 06:55:58,835 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-19 06:55:58,835 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:55:58,835 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-19 06:55:58,836 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=502, Invalid=688, Unknown=0, NotChecked=0, Total=1190 [2020-08-19 06:55:58,836 INFO L87 Difference]: Start difference. First operand 89 states and 92 transitions. Second operand 35 states. [2020-08-19 06:55:59,347 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:55:59,347 INFO L93 Difference]: Finished difference Result 114 states and 120 transitions. [2020-08-19 06:55:59,348 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-19 06:55:59,348 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 84 [2020-08-19 06:55:59,348 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:55:59,349 INFO L225 Difference]: With dead ends: 114 [2020-08-19 06:55:59,349 INFO L226 Difference]: Without dead ends: 92 [2020-08-19 06:55:59,351 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=574, Invalid=832, Unknown=0, NotChecked=0, Total=1406 [2020-08-19 06:55:59,351 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2020-08-19 06:55:59,355 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 91. [2020-08-19 06:55:59,355 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2020-08-19 06:55:59,356 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 94 transitions. [2020-08-19 06:55:59,356 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 94 transitions. Word has length 84 [2020-08-19 06:55:59,356 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:55:59,356 INFO L479 AbstractCegarLoop]: Abstraction has 91 states and 94 transitions. [2020-08-19 06:55:59,356 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-19 06:55:59,357 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 94 transitions. [2020-08-19 06:55:59,357 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2020-08-19 06:55:59,357 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:55:59,357 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:55:59,358 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-19 06:55:59,358 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:55:59,358 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:55:59,358 INFO L82 PathProgramCache]: Analyzing trace with hash -1613047454, now seen corresponding path program 22 times [2020-08-19 06:55:59,358 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:55:59,358 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1146797222] [2020-08-19 06:55:59,359 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:55:59,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:59,414 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:55:59,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:55:59,426 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 06:55:59,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:01,263 INFO L134 CoverageAnalysis]: Checked inductivity of 905 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 06:56:01,263 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1146797222] [2020-08-19 06:56:01,263 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:56:01,263 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-19 06:56:01,264 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2011631576] [2020-08-19 06:56:01,264 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-19 06:56:01,264 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:01,265 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-19 06:56:01,265 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=534, Invalid=726, Unknown=0, NotChecked=0, Total=1260 [2020-08-19 06:56:01,265 INFO L87 Difference]: Start difference. First operand 91 states and 94 transitions. Second operand 36 states. [2020-08-19 06:56:01,625 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:56:01,626 INFO L93 Difference]: Finished difference Result 116 states and 122 transitions. [2020-08-19 06:56:01,626 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-19 06:56:01,626 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 86 [2020-08-19 06:56:01,627 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:56:01,628 INFO L225 Difference]: With dead ends: 116 [2020-08-19 06:56:01,628 INFO L226 Difference]: Without dead ends: 94 [2020-08-19 06:56:01,629 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=608, Invalid=874, Unknown=0, NotChecked=0, Total=1482 [2020-08-19 06:56:01,630 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2020-08-19 06:56:01,634 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 93. [2020-08-19 06:56:01,634 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2020-08-19 06:56:01,634 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 96 transitions. [2020-08-19 06:56:01,635 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 96 transitions. Word has length 86 [2020-08-19 06:56:01,635 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:56:01,635 INFO L479 AbstractCegarLoop]: Abstraction has 93 states and 96 transitions. [2020-08-19 06:56:01,635 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-19 06:56:01,635 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 96 transitions. [2020-08-19 06:56:01,636 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2020-08-19 06:56:01,636 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:01,636 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:01,636 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-19 06:56:01,637 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:01,637 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:01,637 INFO L82 PathProgramCache]: Analyzing trace with hash 740735460, now seen corresponding path program 23 times [2020-08-19 06:56:01,637 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:01,637 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [666414263] [2020-08-19 06:56:01,637 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:01,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:01,717 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:01,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:01,731 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 06:56:01,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:03,532 INFO L134 CoverageAnalysis]: Checked inductivity of 966 backedges. 0 proven. 961 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 06:56:03,532 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [666414263] [2020-08-19 06:56:03,532 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:56:03,532 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-19 06:56:03,533 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [647646131] [2020-08-19 06:56:03,533 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-19 06:56:03,533 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:03,533 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-19 06:56:03,534 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=567, Invalid=765, Unknown=0, NotChecked=0, Total=1332 [2020-08-19 06:56:03,534 INFO L87 Difference]: Start difference. First operand 93 states and 96 transitions. Second operand 37 states. [2020-08-19 06:56:04,041 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:56:04,041 INFO L93 Difference]: Finished difference Result 118 states and 124 transitions. [2020-08-19 06:56:04,041 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-19 06:56:04,042 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 88 [2020-08-19 06:56:04,042 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:56:04,043 INFO L225 Difference]: With dead ends: 118 [2020-08-19 06:56:04,043 INFO L226 Difference]: Without dead ends: 96 [2020-08-19 06:56:04,046 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=643, Invalid=917, Unknown=0, NotChecked=0, Total=1560 [2020-08-19 06:56:04,046 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2020-08-19 06:56:04,053 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 95. [2020-08-19 06:56:04,053 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2020-08-19 06:56:04,054 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 98 transitions. [2020-08-19 06:56:04,054 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 98 transitions. Word has length 88 [2020-08-19 06:56:04,054 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:56:04,055 INFO L479 AbstractCegarLoop]: Abstraction has 95 states and 98 transitions. [2020-08-19 06:56:04,055 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-19 06:56:04,055 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 98 transitions. [2020-08-19 06:56:04,056 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2020-08-19 06:56:04,056 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:04,056 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:04,056 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-19 06:56:04,056 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:04,056 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:04,057 INFO L82 PathProgramCache]: Analyzing trace with hash -721649178, now seen corresponding path program 24 times [2020-08-19 06:56:04,057 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:04,057 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2008987853] [2020-08-19 06:56:04,057 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:04,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:04,120 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:04,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:04,138 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 06:56:04,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:06,128 INFO L134 CoverageAnalysis]: Checked inductivity of 1029 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 06:56:06,129 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2008987853] [2020-08-19 06:56:06,129 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:56:06,129 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-19 06:56:06,129 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [590362316] [2020-08-19 06:56:06,130 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-19 06:56:06,130 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:06,130 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-19 06:56:06,131 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=601, Invalid=805, Unknown=0, NotChecked=0, Total=1406 [2020-08-19 06:56:06,131 INFO L87 Difference]: Start difference. First operand 95 states and 98 transitions. Second operand 38 states. [2020-08-19 06:56:06,602 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:56:06,602 INFO L93 Difference]: Finished difference Result 120 states and 126 transitions. [2020-08-19 06:56:06,603 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-19 06:56:06,603 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 90 [2020-08-19 06:56:06,603 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:56:06,604 INFO L225 Difference]: With dead ends: 120 [2020-08-19 06:56:06,605 INFO L226 Difference]: Without dead ends: 98 [2020-08-19 06:56:06,606 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=679, Invalid=961, Unknown=0, NotChecked=0, Total=1640 [2020-08-19 06:56:06,606 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-08-19 06:56:06,610 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 97. [2020-08-19 06:56:06,610 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2020-08-19 06:56:06,611 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 100 transitions. [2020-08-19 06:56:06,611 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 100 transitions. Word has length 90 [2020-08-19 06:56:06,611 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:56:06,611 INFO L479 AbstractCegarLoop]: Abstraction has 97 states and 100 transitions. [2020-08-19 06:56:06,611 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-19 06:56:06,611 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 100 transitions. [2020-08-19 06:56:06,612 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2020-08-19 06:56:06,612 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:06,612 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:06,612 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-19 06:56:06,613 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:06,613 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:06,613 INFO L82 PathProgramCache]: Analyzing trace with hash -1618980504, now seen corresponding path program 25 times [2020-08-19 06:56:06,613 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:06,613 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1653594065] [2020-08-19 06:56:06,614 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:06,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:06,686 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:06,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:06,697 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 06:56:06,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:08,787 INFO L134 CoverageAnalysis]: Checked inductivity of 1094 backedges. 0 proven. 1089 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 06:56:08,787 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1653594065] [2020-08-19 06:56:08,787 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:56:08,787 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-19 06:56:08,788 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1803625745] [2020-08-19 06:56:08,788 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-19 06:56:08,788 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:08,789 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-19 06:56:08,789 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=636, Invalid=846, Unknown=0, NotChecked=0, Total=1482 [2020-08-19 06:56:08,789 INFO L87 Difference]: Start difference. First operand 97 states and 100 transitions. Second operand 39 states. [2020-08-19 06:56:09,144 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:56:09,145 INFO L93 Difference]: Finished difference Result 122 states and 128 transitions. [2020-08-19 06:56:09,145 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-19 06:56:09,145 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 92 [2020-08-19 06:56:09,146 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:56:09,147 INFO L225 Difference]: With dead ends: 122 [2020-08-19 06:56:09,147 INFO L226 Difference]: Without dead ends: 100 [2020-08-19 06:56:09,148 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=716, Invalid=1006, Unknown=0, NotChecked=0, Total=1722 [2020-08-19 06:56:09,148 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2020-08-19 06:56:09,151 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 99. [2020-08-19 06:56:09,151 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2020-08-19 06:56:09,152 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 102 transitions. [2020-08-19 06:56:09,152 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 102 transitions. Word has length 92 [2020-08-19 06:56:09,152 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:56:09,152 INFO L479 AbstractCegarLoop]: Abstraction has 99 states and 102 transitions. [2020-08-19 06:56:09,152 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-19 06:56:09,153 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 102 transitions. [2020-08-19 06:56:09,153 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2020-08-19 06:56:09,153 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:09,153 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:09,154 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-19 06:56:09,154 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:09,154 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:09,154 INFO L82 PathProgramCache]: Analyzing trace with hash -665958294, now seen corresponding path program 26 times [2020-08-19 06:56:09,154 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:09,154 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2071801124] [2020-08-19 06:56:09,155 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:09,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:09,215 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:09,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:09,233 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 06:56:09,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:11,489 INFO L134 CoverageAnalysis]: Checked inductivity of 1161 backedges. 0 proven. 1156 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 06:56:11,489 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2071801124] [2020-08-19 06:56:11,489 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:56:11,489 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-19 06:56:11,489 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [544860612] [2020-08-19 06:56:11,490 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-19 06:56:11,490 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:11,490 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-19 06:56:11,490 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=672, Invalid=888, Unknown=0, NotChecked=0, Total=1560 [2020-08-19 06:56:11,491 INFO L87 Difference]: Start difference. First operand 99 states and 102 transitions. Second operand 40 states. [2020-08-19 06:56:11,838 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:56:11,838 INFO L93 Difference]: Finished difference Result 124 states and 130 transitions. [2020-08-19 06:56:11,839 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-19 06:56:11,839 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 94 [2020-08-19 06:56:11,839 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:56:11,840 INFO L225 Difference]: With dead ends: 124 [2020-08-19 06:56:11,840 INFO L226 Difference]: Without dead ends: 102 [2020-08-19 06:56:11,841 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=754, Invalid=1052, Unknown=0, NotChecked=0, Total=1806 [2020-08-19 06:56:11,842 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2020-08-19 06:56:11,846 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 101. [2020-08-19 06:56:11,846 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2020-08-19 06:56:11,847 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 104 transitions. [2020-08-19 06:56:11,847 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 104 transitions. Word has length 94 [2020-08-19 06:56:11,847 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:56:11,848 INFO L479 AbstractCegarLoop]: Abstraction has 101 states and 104 transitions. [2020-08-19 06:56:11,848 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-19 06:56:11,848 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 104 transitions. [2020-08-19 06:56:11,848 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-08-19 06:56:11,848 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:11,849 INFO L422 BasicCegarLoop]: trace histogram [35, 35, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:11,849 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-19 06:56:11,849 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:11,849 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:11,849 INFO L82 PathProgramCache]: Analyzing trace with hash 360351468, now seen corresponding path program 27 times [2020-08-19 06:56:11,850 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:11,850 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [160195543] [2020-08-19 06:56:11,850 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:11,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:11,908 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:11,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:11,918 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 06:56:11,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:14,153 INFO L134 CoverageAnalysis]: Checked inductivity of 1230 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 06:56:14,154 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [160195543] [2020-08-19 06:56:14,154 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:56:14,154 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-19 06:56:14,154 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [279399360] [2020-08-19 06:56:14,154 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-19 06:56:14,155 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:14,155 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-19 06:56:14,155 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=709, Invalid=931, Unknown=0, NotChecked=0, Total=1640 [2020-08-19 06:56:14,156 INFO L87 Difference]: Start difference. First operand 101 states and 104 transitions. Second operand 41 states. [2020-08-19 06:56:14,523 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:56:14,524 INFO L93 Difference]: Finished difference Result 126 states and 132 transitions. [2020-08-19 06:56:14,524 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-19 06:56:14,524 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 96 [2020-08-19 06:56:14,525 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:56:14,526 INFO L225 Difference]: With dead ends: 126 [2020-08-19 06:56:14,526 INFO L226 Difference]: Without dead ends: 104 [2020-08-19 06:56:14,527 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=793, Invalid=1099, Unknown=0, NotChecked=0, Total=1892 [2020-08-19 06:56:14,528 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2020-08-19 06:56:14,532 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 103. [2020-08-19 06:56:14,533 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2020-08-19 06:56:14,533 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 106 transitions. [2020-08-19 06:56:14,533 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 106 transitions. Word has length 96 [2020-08-19 06:56:14,534 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:56:14,534 INFO L479 AbstractCegarLoop]: Abstraction has 103 states and 106 transitions. [2020-08-19 06:56:14,534 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-19 06:56:14,534 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 106 transitions. [2020-08-19 06:56:14,534 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2020-08-19 06:56:14,534 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:14,535 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:14,535 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-19 06:56:14,535 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:14,535 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:14,535 INFO L82 PathProgramCache]: Analyzing trace with hash -1198445330, now seen corresponding path program 28 times [2020-08-19 06:56:14,536 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:14,536 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [924618297] [2020-08-19 06:56:14,536 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:14,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:14,597 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:14,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:14,606 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 06:56:14,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:16,934 INFO L134 CoverageAnalysis]: Checked inductivity of 1301 backedges. 0 proven. 1296 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 06:56:16,935 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [924618297] [2020-08-19 06:56:16,935 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:56:16,935 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-19 06:56:16,935 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1753452649] [2020-08-19 06:56:16,935 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-19 06:56:16,936 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:16,936 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-19 06:56:16,936 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=747, Invalid=975, Unknown=0, NotChecked=0, Total=1722 [2020-08-19 06:56:16,936 INFO L87 Difference]: Start difference. First operand 103 states and 106 transitions. Second operand 42 states. [2020-08-19 06:56:17,387 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:56:17,387 INFO L93 Difference]: Finished difference Result 128 states and 134 transitions. [2020-08-19 06:56:17,388 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-19 06:56:17,388 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 98 [2020-08-19 06:56:17,388 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:56:17,389 INFO L225 Difference]: With dead ends: 128 [2020-08-19 06:56:17,389 INFO L226 Difference]: Without dead ends: 106 [2020-08-19 06:56:17,391 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=833, Invalid=1147, Unknown=0, NotChecked=0, Total=1980 [2020-08-19 06:56:17,391 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2020-08-19 06:56:17,395 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 105. [2020-08-19 06:56:17,395 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2020-08-19 06:56:17,396 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 108 transitions. [2020-08-19 06:56:17,396 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 108 transitions. Word has length 98 [2020-08-19 06:56:17,397 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:56:17,397 INFO L479 AbstractCegarLoop]: Abstraction has 105 states and 108 transitions. [2020-08-19 06:56:17,397 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-19 06:56:17,397 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 108 transitions. [2020-08-19 06:56:17,398 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2020-08-19 06:56:17,398 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:17,398 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:17,398 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-19 06:56:17,398 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:17,399 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:17,399 INFO L82 PathProgramCache]: Analyzing trace with hash -258581904, now seen corresponding path program 29 times [2020-08-19 06:56:17,399 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:17,399 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [848695085] [2020-08-19 06:56:17,399 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:17,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:17,469 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:17,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:17,480 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 06:56:17,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:19,939 INFO L134 CoverageAnalysis]: Checked inductivity of 1374 backedges. 0 proven. 1369 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 06:56:19,939 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [848695085] [2020-08-19 06:56:19,939 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:56:19,939 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-19 06:56:19,939 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [593896905] [2020-08-19 06:56:19,940 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-19 06:56:19,940 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:19,940 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-19 06:56:19,941 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=786, Invalid=1020, Unknown=0, NotChecked=0, Total=1806 [2020-08-19 06:56:19,941 INFO L87 Difference]: Start difference. First operand 105 states and 108 transitions. Second operand 43 states.