/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=WIDESTAMONGSMALL --traceabstraction.additional.smt.options tolerance=0.2 -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 [2020-08-18 23:38:23,867 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-18 23:38:23,870 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-18 23:38:23,911 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-18 23:38:23,912 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-18 23:38:23,921 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-18 23:38:23,924 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-18 23:38:23,928 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-18 23:38:23,931 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-18 23:38:23,934 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-18 23:38:23,935 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-18 23:38:23,936 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-18 23:38:23,936 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 23:38:23,939 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 23:38:23,942 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 23:38:23,944 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 23:38:23,945 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 23:38:23,946 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 23:38:23,948 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 23:38:23,957 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 23:38:23,959 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 23:38:23,960 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 23:38:23,961 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 23:38:23,962 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 23:38:23,978 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-18 23:38:23,992 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 23:38:23,996 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 23:38:23,996 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 23:38:23,998 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 [2020-08-18 23:38:24,034 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 23:38:24,034 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 23:38:24,035 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 23:38:24,036 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 23:38:24,036 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 23:38:24,036 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 23:38:24,036 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 23:38:24,037 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 23:38:24,037 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 23:38:24,037 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 23:38:24,037 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 23:38:24,037 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 23:38:24,038 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 23:38:24,038 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 23:38:24,038 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 23:38:24,038 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 23:38:24,038 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 23:38:24,039 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 23:38:24,039 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 23:38:24,039 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 23:38:24,039 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 23:38:24,039 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 23:38:24,040 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 23:38:24,040 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 23:38:24,040 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 23:38:24,040 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 23:38:24,040 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 23:38:24,041 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 23:38:24,041 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 23:38:24,041 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=WIDESTAMONGSMALL;tolerance=0.2; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.2; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.2; [2020-08-18 23:38:24,378 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 23:38:24,397 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 23:38:24,401 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 23:38:24,402 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 23:38:24,403 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 23:38:24,403 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-lopstr16/flag_loopdep.i [2020-08-18 23:38:24,469 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/d5da36cc1/874d06eebe9049449daa705d976a5e3f/FLAG25e9029fd [2020-08-18 23:38:24,927 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 23:38:24,928 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/array-lopstr16/flag_loopdep.i [2020-08-18 23:38:24,935 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/d5da36cc1/874d06eebe9049449daa705d976a5e3f/FLAG25e9029fd [2020-08-18 23:38:25,300 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/d5da36cc1/874d06eebe9049449daa705d976a5e3f [2020-08-18 23:38:25,309 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 23:38:25,311 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 23:38:25,312 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 23:38:25,312 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 23:38:25,317 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 23:38:25,318 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 11:38:25" (1/1) ... [2020-08-18 23:38:25,321 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@59b15dda and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:38:25, skipping insertion in model container [2020-08-18 23:38:25,322 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 11:38:25" (1/1) ... [2020-08-18 23:38:25,331 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 23:38:25,351 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 23:38:25,551 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 23:38:25,558 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 23:38:25,576 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 23:38:25,590 INFO L208 MainTranslator]: Completed translation [2020-08-18 23:38:25,591 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:38:25 WrapperNode [2020-08-18 23:38:25,591 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 23:38:25,592 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 23:38:25,592 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 23:38:25,592 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 23:38:25,685 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:38:25" (1/1) ... [2020-08-18 23:38:25,687 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:38:25" (1/1) ... [2020-08-18 23:38:25,699 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:38:25" (1/1) ... [2020-08-18 23:38:25,699 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:38:25" (1/1) ... [2020-08-18 23:38:25,706 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:38:25" (1/1) ... [2020-08-18 23:38:25,713 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:38:25" (1/1) ... [2020-08-18 23:38:25,714 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:38:25" (1/1) ... [2020-08-18 23:38:25,717 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 23:38:25,717 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 23:38:25,717 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 23:38:25,718 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 23:38:25,719 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:38:25" (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 [2020-08-18 23:38:25,784 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 23:38:25,784 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 23:38:25,785 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-18 23:38:25,785 INFO L138 BoogieDeclarations]: Found implementation of procedure init [2020-08-18 23:38:25,785 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 23:38:25,785 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 23:38:25,786 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-18 23:38:25,786 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2020-08-18 23:38:25,786 INFO L130 BoogieDeclarations]: Found specification of procedure nondet_pointer [2020-08-18 23:38:25,786 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-08-18 23:38:25,787 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-08-18 23:38:25,787 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-08-18 23:38:25,787 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 23:38:25,787 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-18 23:38:25,787 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-08-18 23:38:25,788 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-18 23:38:25,788 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 23:38:25,788 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 23:38:26,049 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 23:38:26,050 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-08-18 23:38:26,057 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 11:38:26 BoogieIcfgContainer [2020-08-18 23:38:26,057 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 23:38:26,059 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 23:38:26,059 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 23:38:26,062 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 23:38:26,063 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 11:38:25" (1/3) ... [2020-08-18 23:38:26,063 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@210197d9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 11:38:26, skipping insertion in model container [2020-08-18 23:38:26,064 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:38:25" (2/3) ... [2020-08-18 23:38:26,064 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@210197d9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 11:38:26, skipping insertion in model container [2020-08-18 23:38:26,064 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 11:38:26" (3/3) ... [2020-08-18 23:38:26,066 INFO L109 eAbstractionObserver]: Analyzing ICFG flag_loopdep.i [2020-08-18 23:38:26,080 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 23:38:26,090 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-18 23:38:26,109 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-18 23:38:26,145 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 23:38:26,145 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 23:38:26,145 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 23:38:26,145 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 23:38:26,146 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 23:38:26,146 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 23:38:26,146 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 23:38:26,146 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 23:38:26,170 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-08-18 23:38:26,176 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-18 23:38:26,176 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:38:26,177 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] [2020-08-18 23:38:26,178 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:38:26,184 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:38:26,185 INFO L82 PathProgramCache]: Analyzing trace with hash 1059974619, now seen corresponding path program 1 times [2020-08-18 23:38:26,195 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:38:26,196 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1366964692] [2020-08-18 23:38:26,196 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:38:26,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:26,396 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:38:26,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:26,437 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 23:38:26,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:26,451 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:38:26,455 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1366964692] [2020-08-18 23:38:26,458 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 23:38:26,459 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 23:38:26,460 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1889592955] [2020-08-18 23:38:26,467 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 23:38:26,467 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:38:26,486 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 23:38:26,487 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 23:38:26,490 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 4 states. [2020-08-18 23:38:26,687 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:38:26,688 INFO L93 Difference]: Finished difference Result 59 states and 76 transitions. [2020-08-18 23:38:26,689 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-18 23:38:26,691 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 20 [2020-08-18 23:38:26,692 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:38:26,708 INFO L225 Difference]: With dead ends: 59 [2020-08-18 23:38:26,708 INFO L226 Difference]: Without dead ends: 31 [2020-08-18 23:38:26,713 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 [2020-08-18 23:38:26,734 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-18 23:38:26,752 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 28. [2020-08-18 23:38:26,754 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-18 23:38:26,755 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 32 transitions. [2020-08-18 23:38:26,757 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 32 transitions. Word has length 20 [2020-08-18 23:38:26,758 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:38:26,758 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 32 transitions. [2020-08-18 23:38:26,758 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 23:38:26,759 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 32 transitions. [2020-08-18 23:38:26,759 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-18 23:38:26,760 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:38:26,760 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] [2020-08-18 23:38:26,760 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 23:38:26,761 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:38:26,761 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:38:26,761 INFO L82 PathProgramCache]: Analyzing trace with hash -931069882, now seen corresponding path program 1 times [2020-08-18 23:38:26,762 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:38:26,762 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [165234758] [2020-08-18 23:38:26,762 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:38:26,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:26,830 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:38:26,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:26,851 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 23:38:26,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:26,930 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:38:26,931 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [165234758] [2020-08-18 23:38:26,931 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 23:38:26,931 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-08-18 23:38:26,931 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1662909174] [2020-08-18 23:38:26,933 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 23:38:26,934 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:38:26,934 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 23:38:26,934 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-08-18 23:38:26,935 INFO L87 Difference]: Start difference. First operand 28 states and 32 transitions. Second operand 6 states. [2020-08-18 23:38:27,143 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:38:27,144 INFO L93 Difference]: Finished difference Result 48 states and 56 transitions. [2020-08-18 23:38:27,144 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-18 23:38:27,145 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2020-08-18 23:38:27,145 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:38:27,146 INFO L225 Difference]: With dead ends: 48 [2020-08-18 23:38:27,146 INFO L226 Difference]: Without dead ends: 30 [2020-08-18 23:38:27,148 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 [2020-08-18 23:38:27,149 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-18 23:38:27,155 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2020-08-18 23:38:27,156 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-18 23:38:27,157 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2020-08-18 23:38:27,157 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 20 [2020-08-18 23:38:27,158 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:38:27,158 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2020-08-18 23:38:27,158 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 23:38:27,158 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2020-08-18 23:38:27,159 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-18 23:38:27,159 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:38:27,160 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] [2020-08-18 23:38:27,160 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 23:38:27,160 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:38:27,161 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:38:27,161 INFO L82 PathProgramCache]: Analyzing trace with hash 1782065480, now seen corresponding path program 1 times [2020-08-18 23:38:27,161 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:38:27,162 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [497247397] [2020-08-18 23:38:27,162 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:38:27,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:27,235 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:38:27,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:27,257 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 23:38:27,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:27,358 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:38:27,359 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [497247397] [2020-08-18 23:38:27,359 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:38:27,359 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-18 23:38:27,360 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [591190014] [2020-08-18 23:38:27,360 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-18 23:38:27,361 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:38:27,361 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-18 23:38:27,361 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-08-18 23:38:27,361 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand 7 states. [2020-08-18 23:38:27,534 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:38:27,535 INFO L93 Difference]: Finished difference Result 50 states and 58 transitions. [2020-08-18 23:38:27,535 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-18 23:38:27,535 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 22 [2020-08-18 23:38:27,536 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:38:27,536 INFO L225 Difference]: With dead ends: 50 [2020-08-18 23:38:27,537 INFO L226 Difference]: Without dead ends: 32 [2020-08-18 23:38:27,537 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 [2020-08-18 23:38:27,538 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-18 23:38:27,543 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2020-08-18 23:38:27,544 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-18 23:38:27,545 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 35 transitions. [2020-08-18 23:38:27,545 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 35 transitions. Word has length 22 [2020-08-18 23:38:27,545 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:38:27,546 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 35 transitions. [2020-08-18 23:38:27,546 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-18 23:38:27,546 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 35 transitions. [2020-08-18 23:38:27,547 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-18 23:38:27,547 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:38:27,547 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] [2020-08-18 23:38:27,547 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-18 23:38:27,548 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:38:27,548 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:38:27,548 INFO L82 PathProgramCache]: Analyzing trace with hash 2059999690, now seen corresponding path program 2 times [2020-08-18 23:38:27,549 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:38:27,549 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1763725492] [2020-08-18 23:38:27,549 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:38:27,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:27,596 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:38:27,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:27,613 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 23:38:27,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:27,802 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:38:27,802 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1763725492] [2020-08-18 23:38:27,803 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:38:27,803 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-18 23:38:27,803 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2088878243] [2020-08-18 23:38:27,804 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-18 23:38:27,804 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:38:27,804 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-18 23:38:27,805 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2020-08-18 23:38:27,805 INFO L87 Difference]: Start difference. First operand 31 states and 35 transitions. Second operand 8 states. [2020-08-18 23:38:27,976 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:38:27,976 INFO L93 Difference]: Finished difference Result 52 states and 60 transitions. [2020-08-18 23:38:27,977 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-18 23:38:27,977 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 24 [2020-08-18 23:38:27,977 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:38:27,978 INFO L225 Difference]: With dead ends: 52 [2020-08-18 23:38:27,978 INFO L226 Difference]: Without dead ends: 34 [2020-08-18 23:38:27,979 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2020-08-18 23:38:27,979 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-18 23:38:27,984 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2020-08-18 23:38:27,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-18 23:38:27,987 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 37 transitions. [2020-08-18 23:38:27,987 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 37 transitions. Word has length 24 [2020-08-18 23:38:27,988 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:38:27,988 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 37 transitions. [2020-08-18 23:38:27,988 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-18 23:38:27,988 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 37 transitions. [2020-08-18 23:38:27,989 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-18 23:38:27,989 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:38:27,989 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] [2020-08-18 23:38:27,989 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-18 23:38:27,989 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:38:27,990 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:38:27,990 INFO L82 PathProgramCache]: Analyzing trace with hash -1428164148, now seen corresponding path program 3 times [2020-08-18 23:38:27,990 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:38:27,990 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2038113750] [2020-08-18 23:38:27,991 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:38:28,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:28,038 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:38:28,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:28,058 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 23:38:28,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:28,234 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:38:28,234 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2038113750] [2020-08-18 23:38:28,235 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:38:28,235 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-18 23:38:28,235 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [315133695] [2020-08-18 23:38:28,236 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-18 23:38:28,236 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:38:28,236 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-18 23:38:28,237 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-18 23:38:28,237 INFO L87 Difference]: Start difference. First operand 33 states and 37 transitions. Second operand 9 states. [2020-08-18 23:38:28,472 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:38:28,472 INFO L93 Difference]: Finished difference Result 54 states and 62 transitions. [2020-08-18 23:38:28,473 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-18 23:38:28,473 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-08-18 23:38:28,473 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:38:28,474 INFO L225 Difference]: With dead ends: 54 [2020-08-18 23:38:28,474 INFO L226 Difference]: Without dead ends: 36 [2020-08-18 23:38:28,475 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 [2020-08-18 23:38:28,475 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-18 23:38:28,483 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2020-08-18 23:38:28,483 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-18 23:38:28,486 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2020-08-18 23:38:28,486 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 26 [2020-08-18 23:38:28,487 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:38:28,487 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2020-08-18 23:38:28,487 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-18 23:38:28,487 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2020-08-18 23:38:28,488 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-18 23:38:28,488 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:38:28,488 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] [2020-08-18 23:38:28,489 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-18 23:38:28,489 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:38:28,489 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:38:28,489 INFO L82 PathProgramCache]: Analyzing trace with hash 815845710, now seen corresponding path program 4 times [2020-08-18 23:38:28,492 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:38:28,493 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [301534581] [2020-08-18 23:38:28,494 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:38:28,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:28,561 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:38:28,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:28,580 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 23:38:28,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:28,825 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:38:28,825 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [301534581] [2020-08-18 23:38:28,825 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:38:28,826 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-18 23:38:28,826 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [268067568] [2020-08-18 23:38:28,826 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-18 23:38:28,827 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:38:28,827 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-18 23:38:28,827 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2020-08-18 23:38:28,828 INFO L87 Difference]: Start difference. First operand 35 states and 39 transitions. Second operand 10 states. [2020-08-18 23:38:28,999 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:38:29,000 INFO L93 Difference]: Finished difference Result 56 states and 64 transitions. [2020-08-18 23:38:29,003 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-18 23:38:29,003 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 28 [2020-08-18 23:38:29,004 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:38:29,005 INFO L225 Difference]: With dead ends: 56 [2020-08-18 23:38:29,005 INFO L226 Difference]: Without dead ends: 38 [2020-08-18 23:38:29,006 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 [2020-08-18 23:38:29,007 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-18 23:38:29,016 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2020-08-18 23:38:29,016 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-18 23:38:29,017 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 41 transitions. [2020-08-18 23:38:29,017 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 41 transitions. Word has length 28 [2020-08-18 23:38:29,017 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:38:29,017 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 41 transitions. [2020-08-18 23:38:29,017 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-18 23:38:29,019 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 41 transitions. [2020-08-18 23:38:29,020 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-18 23:38:29,020 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:38:29,021 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] [2020-08-18 23:38:29,021 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-18 23:38:29,021 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:38:29,021 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:38:29,022 INFO L82 PathProgramCache]: Analyzing trace with hash 1235736656, now seen corresponding path program 5 times [2020-08-18 23:38:29,022 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:38:29,022 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [467555995] [2020-08-18 23:38:29,022 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:38:29,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:29,080 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:38:29,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:29,093 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 23:38:29,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:29,418 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:38:29,418 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [467555995] [2020-08-18 23:38:29,418 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:38:29,418 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-18 23:38:29,419 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [33006635] [2020-08-18 23:38:29,419 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-18 23:38:29,419 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:38:29,420 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-18 23:38:29,420 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2020-08-18 23:38:29,420 INFO L87 Difference]: Start difference. First operand 37 states and 41 transitions. Second operand 11 states. [2020-08-18 23:38:29,672 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:38:29,672 INFO L93 Difference]: Finished difference Result 58 states and 66 transitions. [2020-08-18 23:38:29,672 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-18 23:38:29,672 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 30 [2020-08-18 23:38:29,673 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:38:29,673 INFO L225 Difference]: With dead ends: 58 [2020-08-18 23:38:29,674 INFO L226 Difference]: Without dead ends: 40 [2020-08-18 23:38:29,675 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=58, Invalid=124, Unknown=0, NotChecked=0, Total=182 [2020-08-18 23:38:29,675 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-18 23:38:29,679 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2020-08-18 23:38:29,680 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-18 23:38:29,680 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 43 transitions. [2020-08-18 23:38:29,681 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 43 transitions. Word has length 30 [2020-08-18 23:38:29,681 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:38:29,681 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 43 transitions. [2020-08-18 23:38:29,681 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-18 23:38:29,681 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 43 transitions. [2020-08-18 23:38:29,682 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-18 23:38:29,682 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:38:29,682 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] [2020-08-18 23:38:29,683 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-18 23:38:29,683 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:38:29,683 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:38:29,683 INFO L82 PathProgramCache]: Analyzing trace with hash 1024009938, now seen corresponding path program 6 times [2020-08-18 23:38:29,683 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:38:29,684 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1608874766] [2020-08-18 23:38:29,684 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:38:29,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:29,712 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:38:29,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:29,724 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 23:38:29,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:30,019 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:38:30,019 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1608874766] [2020-08-18 23:38:30,020 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:38:30,020 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-18 23:38:30,020 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1054897240] [2020-08-18 23:38:30,020 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-18 23:38:30,021 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:38:30,021 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-18 23:38:30,021 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=90, Unknown=0, NotChecked=0, Total=132 [2020-08-18 23:38:30,021 INFO L87 Difference]: Start difference. First operand 39 states and 43 transitions. Second operand 12 states. [2020-08-18 23:38:30,253 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:38:30,253 INFO L93 Difference]: Finished difference Result 60 states and 68 transitions. [2020-08-18 23:38:30,253 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-18 23:38:30,254 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 32 [2020-08-18 23:38:30,254 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:38:30,255 INFO L225 Difference]: With dead ends: 60 [2020-08-18 23:38:30,255 INFO L226 Difference]: Without dead ends: 42 [2020-08-18 23:38:30,255 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 [2020-08-18 23:38:30,256 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-18 23:38:30,260 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2020-08-18 23:38:30,260 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-18 23:38:30,261 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 45 transitions. [2020-08-18 23:38:30,261 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 45 transitions. Word has length 32 [2020-08-18 23:38:30,262 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:38:30,262 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 45 transitions. [2020-08-18 23:38:30,262 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-18 23:38:30,262 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 45 transitions. [2020-08-18 23:38:30,263 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-18 23:38:30,263 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:38:30,263 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] [2020-08-18 23:38:30,263 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-18 23:38:30,264 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:38:30,264 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:38:30,264 INFO L82 PathProgramCache]: Analyzing trace with hash -581903148, now seen corresponding path program 7 times [2020-08-18 23:38:30,264 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:38:30,264 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1714027924] [2020-08-18 23:38:30,265 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:38:30,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:30,308 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:38:30,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:30,327 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 23:38:30,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:30,676 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:38:30,677 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1714027924] [2020-08-18 23:38:30,677 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:38:30,677 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-18 23:38:30,682 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [544383468] [2020-08-18 23:38:30,682 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-18 23:38:30,683 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:38:30,686 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-18 23:38:30,686 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=105, Unknown=0, NotChecked=0, Total=156 [2020-08-18 23:38:30,687 INFO L87 Difference]: Start difference. First operand 41 states and 45 transitions. Second operand 13 states. [2020-08-18 23:38:30,893 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:38:30,893 INFO L93 Difference]: Finished difference Result 62 states and 70 transitions. [2020-08-18 23:38:30,893 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-18 23:38:30,894 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 34 [2020-08-18 23:38:30,894 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:38:30,895 INFO L225 Difference]: With dead ends: 62 [2020-08-18 23:38:30,895 INFO L226 Difference]: Without dead ends: 44 [2020-08-18 23:38:30,896 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=79, Invalid=161, Unknown=0, NotChecked=0, Total=240 [2020-08-18 23:38:30,898 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-18 23:38:30,905 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2020-08-18 23:38:30,906 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-18 23:38:30,906 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 47 transitions. [2020-08-18 23:38:30,906 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 47 transitions. Word has length 34 [2020-08-18 23:38:30,908 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:38:30,908 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 47 transitions. [2020-08-18 23:38:30,908 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-18 23:38:30,909 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 47 transitions. [2020-08-18 23:38:30,909 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-18 23:38:30,912 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:38:30,912 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] [2020-08-18 23:38:30,913 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-18 23:38:30,913 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:38:30,913 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:38:30,913 INFO L82 PathProgramCache]: Analyzing trace with hash -1971119530, now seen corresponding path program 8 times [2020-08-18 23:38:30,913 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:38:30,914 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1332035733] [2020-08-18 23:38:30,914 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:38:30,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:30,969 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:38:30,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:30,983 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 23:38:30,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:31,359 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:38:31,360 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1332035733] [2020-08-18 23:38:31,360 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:38:31,360 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-18 23:38:31,361 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1199581025] [2020-08-18 23:38:31,362 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-18 23:38:31,362 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:38:31,363 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-18 23:38:31,364 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2020-08-18 23:38:31,364 INFO L87 Difference]: Start difference. First operand 43 states and 47 transitions. Second operand 14 states. [2020-08-18 23:38:31,625 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:38:31,626 INFO L93 Difference]: Finished difference Result 64 states and 72 transitions. [2020-08-18 23:38:31,626 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-18 23:38:31,626 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 36 [2020-08-18 23:38:31,627 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:38:31,627 INFO L225 Difference]: With dead ends: 64 [2020-08-18 23:38:31,628 INFO L226 Difference]: Without dead ends: 46 [2020-08-18 23:38:31,628 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=91, Invalid=181, Unknown=0, NotChecked=0, Total=272 [2020-08-18 23:38:31,629 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-18 23:38:31,633 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2020-08-18 23:38:31,634 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-18 23:38:31,634 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 49 transitions. [2020-08-18 23:38:31,635 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 49 transitions. Word has length 36 [2020-08-18 23:38:31,635 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:38:31,635 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 49 transitions. [2020-08-18 23:38:31,635 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-18 23:38:31,635 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 49 transitions. [2020-08-18 23:38:31,636 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-18 23:38:31,645 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:38:31,646 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] [2020-08-18 23:38:31,646 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-18 23:38:31,646 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:38:31,646 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:38:31,647 INFO L82 PathProgramCache]: Analyzing trace with hash -1273233576, now seen corresponding path program 9 times [2020-08-18 23:38:31,647 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:38:31,647 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1154242465] [2020-08-18 23:38:31,647 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:38:31,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:31,684 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:38:31,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:31,720 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 23:38:31,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:31,732 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2020-08-18 23:38:31,732 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1154242465] [2020-08-18 23:38:31,732 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 23:38:31,733 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-18 23:38:31,733 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1491293964] [2020-08-18 23:38:31,733 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 23:38:31,734 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:38:31,734 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 23:38:31,734 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-18 23:38:31,734 INFO L87 Difference]: Start difference. First operand 45 states and 49 transitions. Second operand 5 states. [2020-08-18 23:38:31,816 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:38:31,817 INFO L93 Difference]: Finished difference Result 65 states and 74 transitions. [2020-08-18 23:38:31,817 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-18 23:38:31,817 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 38 [2020-08-18 23:38:31,817 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:38:31,819 INFO L225 Difference]: With dead ends: 65 [2020-08-18 23:38:31,819 INFO L226 Difference]: Without dead ends: 53 [2020-08-18 23:38:31,820 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 [2020-08-18 23:38:31,820 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-08-18 23:38:31,829 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 46. [2020-08-18 23:38:31,829 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-18 23:38:31,830 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 50 transitions. [2020-08-18 23:38:31,830 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 50 transitions. Word has length 38 [2020-08-18 23:38:31,830 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:38:31,830 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 50 transitions. [2020-08-18 23:38:31,830 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 23:38:31,831 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 50 transitions. [2020-08-18 23:38:31,831 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-18 23:38:31,831 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:38:31,831 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] [2020-08-18 23:38:31,832 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-18 23:38:31,832 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:38:31,832 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:38:31,832 INFO L82 PathProgramCache]: Analyzing trace with hash -1053921041, now seen corresponding path program 1 times [2020-08-18 23:38:31,832 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:38:31,833 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1641232275] [2020-08-18 23:38:31,833 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:38:31,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:31,873 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:38:31,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:31,887 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 23:38:31,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:31,899 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2020-08-18 23:38:31,900 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1641232275] [2020-08-18 23:38:31,900 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:38:31,900 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-18 23:38:31,900 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1276038634] [2020-08-18 23:38:31,901 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 23:38:31,901 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:38:31,901 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 23:38:31,901 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-08-18 23:38:31,902 INFO L87 Difference]: Start difference. First operand 46 states and 50 transitions. Second operand 6 states. [2020-08-18 23:38:32,018 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:38:32,019 INFO L93 Difference]: Finished difference Result 73 states and 85 transitions. [2020-08-18 23:38:32,019 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 23:38:32,019 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 41 [2020-08-18 23:38:32,020 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:38:32,020 INFO L225 Difference]: With dead ends: 73 [2020-08-18 23:38:32,020 INFO L226 Difference]: Without dead ends: 61 [2020-08-18 23:38:32,021 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 [2020-08-18 23:38:32,021 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-08-18 23:38:32,026 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 49. [2020-08-18 23:38:32,026 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-18 23:38:32,026 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 54 transitions. [2020-08-18 23:38:32,027 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 54 transitions. Word has length 41 [2020-08-18 23:38:32,027 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:38:32,027 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 54 transitions. [2020-08-18 23:38:32,027 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 23:38:32,027 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 54 transitions. [2020-08-18 23:38:32,028 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-18 23:38:32,028 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:38:32,028 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] [2020-08-18 23:38:32,028 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-18 23:38:32,029 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:38:32,029 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:38:32,029 INFO L82 PathProgramCache]: Analyzing trace with hash -159448072, now seen corresponding path program 2 times [2020-08-18 23:38:32,029 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:38:32,030 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1882592087] [2020-08-18 23:38:32,030 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:38:32,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:32,074 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:38:32,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:32,086 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 23:38:32,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:32,097 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 83 trivial. 0 not checked. [2020-08-18 23:38:32,098 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1882592087] [2020-08-18 23:38:32,098 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 23:38:32,098 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-18 23:38:32,098 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [696337000] [2020-08-18 23:38:32,099 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 23:38:32,099 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:38:32,099 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 23:38:32,099 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-18 23:38:32,100 INFO L87 Difference]: Start difference. First operand 49 states and 54 transitions. Second operand 5 states. [2020-08-18 23:38:32,180 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:38:32,181 INFO L93 Difference]: Finished difference Result 69 states and 78 transitions. [2020-08-18 23:38:32,185 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-18 23:38:32,185 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 44 [2020-08-18 23:38:32,185 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:38:32,186 INFO L225 Difference]: With dead ends: 69 [2020-08-18 23:38:32,186 INFO L226 Difference]: Without dead ends: 49 [2020-08-18 23:38:32,187 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 [2020-08-18 23:38:32,187 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-18 23:38:32,200 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-18 23:38:32,200 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-18 23:38:32,201 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 52 transitions. [2020-08-18 23:38:32,201 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 52 transitions. Word has length 44 [2020-08-18 23:38:32,201 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:38:32,201 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 52 transitions. [2020-08-18 23:38:32,201 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 23:38:32,202 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 52 transitions. [2020-08-18 23:38:32,202 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-18 23:38:32,202 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:38:32,202 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] [2020-08-18 23:38:32,203 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-18 23:38:32,203 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:38:32,203 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:38:32,203 INFO L82 PathProgramCache]: Analyzing trace with hash -1139281096, now seen corresponding path program 1 times [2020-08-18 23:38:32,203 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:38:32,204 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2108496447] [2020-08-18 23:38:32,204 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:38:32,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:32,266 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:38:32,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:32,278 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 23:38:32,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:32,710 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 23:38:32,711 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2108496447] [2020-08-18 23:38:32,711 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:38:32,711 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-18 23:38:32,711 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2117255144] [2020-08-18 23:38:32,712 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-18 23:38:32,712 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:38:32,712 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-18 23:38:32,712 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=138, Unknown=0, NotChecked=0, Total=210 [2020-08-18 23:38:32,712 INFO L87 Difference]: Start difference. First operand 49 states and 52 transitions. Second operand 15 states. [2020-08-18 23:38:32,991 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:38:32,992 INFO L93 Difference]: Finished difference Result 74 states and 80 transitions. [2020-08-18 23:38:32,992 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-18 23:38:32,992 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 44 [2020-08-18 23:38:32,992 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:38:32,993 INFO L225 Difference]: With dead ends: 74 [2020-08-18 23:38:32,993 INFO L226 Difference]: Without dead ends: 52 [2020-08-18 23:38:32,995 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 [2020-08-18 23:38:32,995 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-18 23:38:32,999 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2020-08-18 23:38:33,000 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-18 23:38:33,000 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 54 transitions. [2020-08-18 23:38:33,000 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 54 transitions. Word has length 44 [2020-08-18 23:38:33,001 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:38:33,001 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 54 transitions. [2020-08-18 23:38:33,001 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-18 23:38:33,001 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 54 transitions. [2020-08-18 23:38:33,001 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-18 23:38:33,001 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:38:33,002 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] [2020-08-18 23:38:33,002 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-18 23:38:33,002 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:38:33,002 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:38:33,002 INFO L82 PathProgramCache]: Analyzing trace with hash 763672122, now seen corresponding path program 2 times [2020-08-18 23:38:33,003 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:38:33,003 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2094925238] [2020-08-18 23:38:33,003 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:38:33,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:33,036 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:38:33,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:33,048 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 23:38:33,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:33,538 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 23:38:33,538 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2094925238] [2020-08-18 23:38:33,538 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:38:33,538 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-18 23:38:33,538 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1463501837] [2020-08-18 23:38:33,539 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-18 23:38:33,539 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:38:33,539 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-18 23:38:33,540 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=156, Unknown=0, NotChecked=0, Total=240 [2020-08-18 23:38:33,540 INFO L87 Difference]: Start difference. First operand 51 states and 54 transitions. Second operand 16 states. [2020-08-18 23:38:33,811 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:38:33,811 INFO L93 Difference]: Finished difference Result 76 states and 82 transitions. [2020-08-18 23:38:33,812 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-18 23:38:33,812 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 46 [2020-08-18 23:38:33,813 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:38:33,813 INFO L225 Difference]: With dead ends: 76 [2020-08-18 23:38:33,813 INFO L226 Difference]: Without dead ends: 54 [2020-08-18 23:38:33,814 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=118, Invalid=224, Unknown=0, NotChecked=0, Total=342 [2020-08-18 23:38:33,814 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-18 23:38:33,822 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2020-08-18 23:38:33,822 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-18 23:38:33,824 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 56 transitions. [2020-08-18 23:38:33,825 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 56 transitions. Word has length 46 [2020-08-18 23:38:33,825 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:38:33,825 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 56 transitions. [2020-08-18 23:38:33,825 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-18 23:38:33,826 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 56 transitions. [2020-08-18 23:38:33,826 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-18 23:38:33,826 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:38:33,826 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] [2020-08-18 23:38:33,827 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-18 23:38:33,827 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:38:33,827 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:38:33,827 INFO L82 PathProgramCache]: Analyzing trace with hash -154353476, now seen corresponding path program 3 times [2020-08-18 23:38:33,829 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:38:33,829 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1712092354] [2020-08-18 23:38:33,829 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:38:33,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:33,881 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:38:33,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:33,893 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 23:38:33,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:34,444 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 23:38:34,444 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1712092354] [2020-08-18 23:38:34,447 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:38:34,448 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-18 23:38:34,448 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [286886111] [2020-08-18 23:38:34,448 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-18 23:38:34,449 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:38:34,449 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-18 23:38:34,450 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=175, Unknown=0, NotChecked=0, Total=272 [2020-08-18 23:38:34,450 INFO L87 Difference]: Start difference. First operand 53 states and 56 transitions. Second operand 17 states. [2020-08-18 23:38:34,739 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:38:34,739 INFO L93 Difference]: Finished difference Result 78 states and 84 transitions. [2020-08-18 23:38:34,739 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-18 23:38:34,739 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 48 [2020-08-18 23:38:34,740 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:38:34,740 INFO L225 Difference]: With dead ends: 78 [2020-08-18 23:38:34,740 INFO L226 Difference]: Without dead ends: 56 [2020-08-18 23:38:34,741 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=133, Invalid=247, Unknown=0, NotChecked=0, Total=380 [2020-08-18 23:38:34,741 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-08-18 23:38:34,745 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2020-08-18 23:38:34,746 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-18 23:38:34,746 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 58 transitions. [2020-08-18 23:38:34,746 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 58 transitions. Word has length 48 [2020-08-18 23:38:34,747 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:38:34,747 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 58 transitions. [2020-08-18 23:38:34,747 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-18 23:38:34,747 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 58 transitions. [2020-08-18 23:38:34,748 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-18 23:38:34,748 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:38:34,748 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] [2020-08-18 23:38:34,748 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-18 23:38:34,748 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:38:34,749 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:38:34,749 INFO L82 PathProgramCache]: Analyzing trace with hash -1908657474, now seen corresponding path program 4 times [2020-08-18 23:38:34,749 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:38:34,749 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [261051662] [2020-08-18 23:38:34,750 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:38:34,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:34,801 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:38:34,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:34,813 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 23:38:34,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:35,430 INFO L134 CoverageAnalysis]: Checked inductivity of 149 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 23:38:35,431 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [261051662] [2020-08-18 23:38:35,431 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:38:35,431 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-18 23:38:35,432 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [704441600] [2020-08-18 23:38:35,433 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-18 23:38:35,433 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:38:35,433 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-18 23:38:35,433 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=195, Unknown=0, NotChecked=0, Total=306 [2020-08-18 23:38:35,434 INFO L87 Difference]: Start difference. First operand 55 states and 58 transitions. Second operand 18 states. [2020-08-18 23:38:35,732 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:38:35,732 INFO L93 Difference]: Finished difference Result 80 states and 86 transitions. [2020-08-18 23:38:35,733 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-18 23:38:35,733 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 50 [2020-08-18 23:38:35,733 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:38:35,734 INFO L225 Difference]: With dead ends: 80 [2020-08-18 23:38:35,734 INFO L226 Difference]: Without dead ends: 58 [2020-08-18 23:38:35,735 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=149, Invalid=271, Unknown=0, NotChecked=0, Total=420 [2020-08-18 23:38:35,738 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-18 23:38:35,745 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2020-08-18 23:38:35,745 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-18 23:38:35,746 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 60 transitions. [2020-08-18 23:38:35,746 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 60 transitions. Word has length 50 [2020-08-18 23:38:35,746 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:38:35,746 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 60 transitions. [2020-08-18 23:38:35,747 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-18 23:38:35,748 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 60 transitions. [2020-08-18 23:38:35,748 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-18 23:38:35,749 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:38:35,749 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] [2020-08-18 23:38:35,749 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-18 23:38:35,749 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:38:35,750 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:38:35,751 INFO L82 PathProgramCache]: Analyzing trace with hash 127347776, now seen corresponding path program 5 times [2020-08-18 23:38:35,751 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:38:35,751 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [85303091] [2020-08-18 23:38:35,751 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:38:35,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:35,807 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:38:35,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:35,819 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 23:38:35,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:36,610 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 23:38:36,610 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [85303091] [2020-08-18 23:38:36,611 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:38:36,611 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-18 23:38:36,611 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1485290601] [2020-08-18 23:38:36,614 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-18 23:38:36,615 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:38:36,617 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-18 23:38:36,621 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=216, Unknown=0, NotChecked=0, Total=342 [2020-08-18 23:38:36,621 INFO L87 Difference]: Start difference. First operand 57 states and 60 transitions. Second operand 19 states. [2020-08-18 23:38:36,977 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:38:36,977 INFO L93 Difference]: Finished difference Result 82 states and 88 transitions. [2020-08-18 23:38:36,978 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-18 23:38:36,978 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 52 [2020-08-18 23:38:36,978 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:38:36,979 INFO L225 Difference]: With dead ends: 82 [2020-08-18 23:38:36,979 INFO L226 Difference]: Without dead ends: 60 [2020-08-18 23:38:36,980 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=166, Invalid=296, Unknown=0, NotChecked=0, Total=462 [2020-08-18 23:38:36,981 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-08-18 23:38:36,986 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 59. [2020-08-18 23:38:36,986 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-08-18 23:38:36,987 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 62 transitions. [2020-08-18 23:38:36,987 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 62 transitions. Word has length 52 [2020-08-18 23:38:36,987 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:38:36,988 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 62 transitions. [2020-08-18 23:38:36,988 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-18 23:38:36,988 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 62 transitions. [2020-08-18 23:38:36,988 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-18 23:38:36,988 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:38:36,989 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] [2020-08-18 23:38:36,989 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-18 23:38:36,989 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:38:36,989 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:38:36,989 INFO L82 PathProgramCache]: Analyzing trace with hash -1776693950, now seen corresponding path program 6 times [2020-08-18 23:38:36,991 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:38:36,991 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1666520658] [2020-08-18 23:38:36,991 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:38:37,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:37,042 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:38:37,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:37,055 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 23:38:37,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:37,722 INFO L134 CoverageAnalysis]: Checked inductivity of 201 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 23:38:37,723 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1666520658] [2020-08-18 23:38:37,723 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:38:37,723 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-18 23:38:37,723 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [891178557] [2020-08-18 23:38:37,724 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-18 23:38:37,724 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:38:37,724 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-18 23:38:37,725 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=142, Invalid=238, Unknown=0, NotChecked=0, Total=380 [2020-08-18 23:38:37,725 INFO L87 Difference]: Start difference. First operand 59 states and 62 transitions. Second operand 20 states. [2020-08-18 23:38:38,031 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:38:38,032 INFO L93 Difference]: Finished difference Result 84 states and 90 transitions. [2020-08-18 23:38:38,038 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-18 23:38:38,038 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 54 [2020-08-18 23:38:38,038 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:38:38,039 INFO L225 Difference]: With dead ends: 84 [2020-08-18 23:38:38,039 INFO L226 Difference]: Without dead ends: 62 [2020-08-18 23:38:38,040 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 [2020-08-18 23:38:38,040 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-08-18 23:38:38,044 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2020-08-18 23:38:38,044 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-08-18 23:38:38,044 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 64 transitions. [2020-08-18 23:38:38,045 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 64 transitions. Word has length 54 [2020-08-18 23:38:38,045 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:38:38,045 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 64 transitions. [2020-08-18 23:38:38,045 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-18 23:38:38,045 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 64 transitions. [2020-08-18 23:38:38,046 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-18 23:38:38,046 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:38:38,046 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] [2020-08-18 23:38:38,046 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-18 23:38:38,047 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:38:38,047 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:38:38,047 INFO L82 PathProgramCache]: Analyzing trace with hash -1904724540, now seen corresponding path program 7 times [2020-08-18 23:38:38,047 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:38:38,047 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1377151740] [2020-08-18 23:38:38,048 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:38:38,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:38,091 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:38:38,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:38,104 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 23:38:38,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:38,829 INFO L134 CoverageAnalysis]: Checked inductivity of 230 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 23:38:38,830 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1377151740] [2020-08-18 23:38:38,830 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:38:38,830 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-18 23:38:38,830 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [398337975] [2020-08-18 23:38:38,831 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-18 23:38:38,831 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:38:38,831 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-18 23:38:38,832 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=159, Invalid=261, Unknown=0, NotChecked=0, Total=420 [2020-08-18 23:38:38,832 INFO L87 Difference]: Start difference. First operand 61 states and 64 transitions. Second operand 21 states. [2020-08-18 23:38:39,092 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:38:39,092 INFO L93 Difference]: Finished difference Result 86 states and 92 transitions. [2020-08-18 23:38:39,092 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-18 23:38:39,093 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 56 [2020-08-18 23:38:39,093 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:38:39,094 INFO L225 Difference]: With dead ends: 86 [2020-08-18 23:38:39,094 INFO L226 Difference]: Without dead ends: 64 [2020-08-18 23:38:39,095 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=203, Invalid=349, Unknown=0, NotChecked=0, Total=552 [2020-08-18 23:38:39,096 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-08-18 23:38:39,099 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2020-08-18 23:38:39,099 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2020-08-18 23:38:39,101 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 66 transitions. [2020-08-18 23:38:39,102 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 66 transitions. Word has length 56 [2020-08-18 23:38:39,102 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:38:39,102 INFO L479 AbstractCegarLoop]: Abstraction has 63 states and 66 transitions. [2020-08-18 23:38:39,102 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-18 23:38:39,102 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 66 transitions. [2020-08-18 23:38:39,103 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-08-18 23:38:39,103 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:38:39,103 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] [2020-08-18 23:38:39,103 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-18 23:38:39,104 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:38:39,104 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:38:39,104 INFO L82 PathProgramCache]: Analyzing trace with hash -388069946, now seen corresponding path program 8 times [2020-08-18 23:38:39,104 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:38:39,104 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [946874168] [2020-08-18 23:38:39,104 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:38:39,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:39,160 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:38:39,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:39,172 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 23:38:39,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:40,022 INFO L134 CoverageAnalysis]: Checked inductivity of 261 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 23:38:40,022 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [946874168] [2020-08-18 23:38:40,023 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:38:40,023 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-18 23:38:40,023 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [440809052] [2020-08-18 23:38:40,023 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-18 23:38:40,024 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:38:40,024 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-18 23:38:40,024 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=177, Invalid=285, Unknown=0, NotChecked=0, Total=462 [2020-08-18 23:38:40,025 INFO L87 Difference]: Start difference. First operand 63 states and 66 transitions. Second operand 22 states. [2020-08-18 23:38:40,393 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:38:40,393 INFO L93 Difference]: Finished difference Result 88 states and 94 transitions. [2020-08-18 23:38:40,394 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-18 23:38:40,394 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 58 [2020-08-18 23:38:40,395 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:38:40,396 INFO L225 Difference]: With dead ends: 88 [2020-08-18 23:38:40,396 INFO L226 Difference]: Without dead ends: 66 [2020-08-18 23:38:40,398 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 [2020-08-18 23:38:40,398 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-08-18 23:38:40,408 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2020-08-18 23:38:40,408 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-08-18 23:38:40,409 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 68 transitions. [2020-08-18 23:38:40,409 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 68 transitions. Word has length 58 [2020-08-18 23:38:40,410 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:38:40,410 INFO L479 AbstractCegarLoop]: Abstraction has 65 states and 68 transitions. [2020-08-18 23:38:40,410 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-18 23:38:40,410 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 68 transitions. [2020-08-18 23:38:40,411 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2020-08-18 23:38:40,411 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:38:40,411 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] [2020-08-18 23:38:40,412 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-18 23:38:40,412 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:38:40,412 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:38:40,412 INFO L82 PathProgramCache]: Analyzing trace with hash 1123081544, now seen corresponding path program 9 times [2020-08-18 23:38:40,412 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:38:40,413 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1825289032] [2020-08-18 23:38:40,413 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:38:40,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:40,491 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:38:40,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:40,504 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 23:38:40,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:41,626 INFO L134 CoverageAnalysis]: Checked inductivity of 294 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 23:38:41,626 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1825289032] [2020-08-18 23:38:41,627 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:38:41,627 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-18 23:38:41,627 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [178708372] [2020-08-18 23:38:41,627 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-18 23:38:41,628 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:38:41,628 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-18 23:38:41,628 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=196, Invalid=310, Unknown=0, NotChecked=0, Total=506 [2020-08-18 23:38:41,628 INFO L87 Difference]: Start difference. First operand 65 states and 68 transitions. Second operand 23 states. [2020-08-18 23:38:41,962 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:38:41,962 INFO L93 Difference]: Finished difference Result 90 states and 96 transitions. [2020-08-18 23:38:41,964 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-18 23:38:41,965 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 60 [2020-08-18 23:38:41,965 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:38:41,966 INFO L225 Difference]: With dead ends: 90 [2020-08-18 23:38:41,966 INFO L226 Difference]: Without dead ends: 68 [2020-08-18 23:38:41,966 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=244, Invalid=406, Unknown=0, NotChecked=0, Total=650 [2020-08-18 23:38:41,967 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-08-18 23:38:41,970 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 67. [2020-08-18 23:38:41,971 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-08-18 23:38:41,971 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 70 transitions. [2020-08-18 23:38:41,971 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 70 transitions. Word has length 60 [2020-08-18 23:38:41,972 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:38:41,972 INFO L479 AbstractCegarLoop]: Abstraction has 67 states and 70 transitions. [2020-08-18 23:38:41,972 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-18 23:38:41,972 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 70 transitions. [2020-08-18 23:38:41,973 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2020-08-18 23:38:41,973 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:38:41,973 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] [2020-08-18 23:38:41,973 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-18 23:38:41,973 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:38:41,973 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:38:41,974 INFO L82 PathProgramCache]: Analyzing trace with hash 1640717386, now seen corresponding path program 10 times [2020-08-18 23:38:41,974 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:38:41,974 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1459883023] [2020-08-18 23:38:41,974 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:38:41,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:42,028 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:38:42,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:42,038 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 23:38:42,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:42,976 INFO L134 CoverageAnalysis]: Checked inductivity of 329 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 23:38:42,976 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1459883023] [2020-08-18 23:38:42,976 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:38:42,977 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-18 23:38:42,977 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [798414253] [2020-08-18 23:38:42,977 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-18 23:38:42,977 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:38:42,978 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-18 23:38:42,978 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=216, Invalid=336, Unknown=0, NotChecked=0, Total=552 [2020-08-18 23:38:42,978 INFO L87 Difference]: Start difference. First operand 67 states and 70 transitions. Second operand 24 states. [2020-08-18 23:38:43,279 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:38:43,280 INFO L93 Difference]: Finished difference Result 92 states and 98 transitions. [2020-08-18 23:38:43,280 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-18 23:38:43,280 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 62 [2020-08-18 23:38:43,281 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:38:43,281 INFO L225 Difference]: With dead ends: 92 [2020-08-18 23:38:43,282 INFO L226 Difference]: Without dead ends: 70 [2020-08-18 23:38:43,283 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 [2020-08-18 23:38:43,283 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-08-18 23:38:43,287 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 69. [2020-08-18 23:38:43,287 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2020-08-18 23:38:43,287 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 72 transitions. [2020-08-18 23:38:43,288 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 72 transitions. Word has length 62 [2020-08-18 23:38:43,288 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:38:43,288 INFO L479 AbstractCegarLoop]: Abstraction has 69 states and 72 transitions. [2020-08-18 23:38:43,288 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-18 23:38:43,288 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 72 transitions. [2020-08-18 23:38:43,289 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2020-08-18 23:38:43,289 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:38:43,289 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] [2020-08-18 23:38:43,289 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-18 23:38:43,289 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:38:43,290 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:38:43,290 INFO L82 PathProgramCache]: Analyzing trace with hash 872555212, now seen corresponding path program 11 times [2020-08-18 23:38:43,290 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:38:43,290 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2022961286] [2020-08-18 23:38:43,290 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:38:43,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:43,335 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:38:43,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:43,346 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 23:38:43,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:44,377 INFO L134 CoverageAnalysis]: Checked inductivity of 366 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 23:38:44,378 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2022961286] [2020-08-18 23:38:44,379 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:38:44,379 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-18 23:38:44,379 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [25036417] [2020-08-18 23:38:44,380 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-18 23:38:44,380 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:38:44,380 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-18 23:38:44,381 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=237, Invalid=363, Unknown=0, NotChecked=0, Total=600 [2020-08-18 23:38:44,381 INFO L87 Difference]: Start difference. First operand 69 states and 72 transitions. Second operand 25 states. [2020-08-18 23:38:44,724 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:38:44,725 INFO L93 Difference]: Finished difference Result 94 states and 100 transitions. [2020-08-18 23:38:44,725 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-18 23:38:44,725 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 64 [2020-08-18 23:38:44,725 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:38:44,726 INFO L225 Difference]: With dead ends: 94 [2020-08-18 23:38:44,726 INFO L226 Difference]: Without dead ends: 72 [2020-08-18 23:38:44,726 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=289, Invalid=467, Unknown=0, NotChecked=0, Total=756 [2020-08-18 23:38:44,727 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-08-18 23:38:44,730 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 71. [2020-08-18 23:38:44,730 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-08-18 23:38:44,733 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 74 transitions. [2020-08-18 23:38:44,733 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 74 transitions. Word has length 64 [2020-08-18 23:38:44,733 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:38:44,733 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 74 transitions. [2020-08-18 23:38:44,733 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-18 23:38:44,734 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 74 transitions. [2020-08-18 23:38:44,734 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2020-08-18 23:38:44,734 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:38:44,734 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] [2020-08-18 23:38:44,736 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-18 23:38:44,736 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:38:44,737 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:38:44,737 INFO L82 PathProgramCache]: Analyzing trace with hash 1403080910, now seen corresponding path program 12 times [2020-08-18 23:38:44,737 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:38:44,737 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [77869432] [2020-08-18 23:38:44,737 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:38:44,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:44,783 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:38:44,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:44,794 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 23:38:44,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:45,948 INFO L134 CoverageAnalysis]: Checked inductivity of 405 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 23:38:45,948 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [77869432] [2020-08-18 23:38:45,948 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:38:45,948 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-18 23:38:45,950 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2083241268] [2020-08-18 23:38:45,950 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-18 23:38:45,950 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:38:45,951 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-18 23:38:45,951 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=259, Invalid=391, Unknown=0, NotChecked=0, Total=650 [2020-08-18 23:38:45,951 INFO L87 Difference]: Start difference. First operand 71 states and 74 transitions. Second operand 26 states. [2020-08-18 23:38:46,328 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:38:46,329 INFO L93 Difference]: Finished difference Result 96 states and 102 transitions. [2020-08-18 23:38:46,335 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-18 23:38:46,335 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 66 [2020-08-18 23:38:46,335 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:38:46,336 INFO L225 Difference]: With dead ends: 96 [2020-08-18 23:38:46,336 INFO L226 Difference]: Without dead ends: 74 [2020-08-18 23:38:46,337 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=313, Invalid=499, Unknown=0, NotChecked=0, Total=812 [2020-08-18 23:38:46,337 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2020-08-18 23:38:46,341 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 73. [2020-08-18 23:38:46,341 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-08-18 23:38:46,342 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 76 transitions. [2020-08-18 23:38:46,342 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 76 transitions. Word has length 66 [2020-08-18 23:38:46,342 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:38:46,342 INFO L479 AbstractCegarLoop]: Abstraction has 73 states and 76 transitions. [2020-08-18 23:38:46,342 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-18 23:38:46,342 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 76 transitions. [2020-08-18 23:38:46,343 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-08-18 23:38:46,343 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:38:46,343 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] [2020-08-18 23:38:46,343 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-18 23:38:46,343 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:38:46,343 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:38:46,343 INFO L82 PathProgramCache]: Analyzing trace with hash 137168464, now seen corresponding path program 13 times [2020-08-18 23:38:46,344 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:38:46,344 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [662513987] [2020-08-18 23:38:46,344 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:38:46,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:46,397 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:38:46,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:46,409 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 23:38:46,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:47,525 INFO L134 CoverageAnalysis]: Checked inductivity of 446 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 23:38:47,525 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [662513987] [2020-08-18 23:38:47,525 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:38:47,526 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-18 23:38:47,526 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [974043138] [2020-08-18 23:38:47,526 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-18 23:38:47,526 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:38:47,527 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-18 23:38:47,527 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=282, Invalid=420, Unknown=0, NotChecked=0, Total=702 [2020-08-18 23:38:47,527 INFO L87 Difference]: Start difference. First operand 73 states and 76 transitions. Second operand 27 states. [2020-08-18 23:38:47,785 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:38:47,785 INFO L93 Difference]: Finished difference Result 98 states and 104 transitions. [2020-08-18 23:38:47,786 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-18 23:38:47,786 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 68 [2020-08-18 23:38:47,786 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:38:47,787 INFO L225 Difference]: With dead ends: 98 [2020-08-18 23:38:47,787 INFO L226 Difference]: Without dead ends: 76 [2020-08-18 23:38:47,788 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=338, Invalid=532, Unknown=0, NotChecked=0, Total=870 [2020-08-18 23:38:47,788 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-08-18 23:38:47,791 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 75. [2020-08-18 23:38:47,791 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2020-08-18 23:38:47,792 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 78 transitions. [2020-08-18 23:38:47,792 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 78 transitions. Word has length 68 [2020-08-18 23:38:47,792 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:38:47,792 INFO L479 AbstractCegarLoop]: Abstraction has 75 states and 78 transitions. [2020-08-18 23:38:47,792 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-18 23:38:47,792 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 78 transitions. [2020-08-18 23:38:47,793 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2020-08-18 23:38:47,793 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:38:47,793 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] [2020-08-18 23:38:47,793 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-18 23:38:47,794 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:38:47,794 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:38:47,794 INFO L82 PathProgramCache]: Analyzing trace with hash -928947374, now seen corresponding path program 14 times [2020-08-18 23:38:47,794 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:38:47,794 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [123349326] [2020-08-18 23:38:47,795 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:38:47,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:47,838 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:38:47,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:47,855 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 23:38:47,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:49,016 INFO L134 CoverageAnalysis]: Checked inductivity of 489 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 23:38:49,017 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [123349326] [2020-08-18 23:38:49,017 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:38:49,017 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-18 23:38:49,018 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1618392009] [2020-08-18 23:38:49,018 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-18 23:38:49,018 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:38:49,018 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-18 23:38:49,019 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=306, Invalid=450, Unknown=0, NotChecked=0, Total=756 [2020-08-18 23:38:49,019 INFO L87 Difference]: Start difference. First operand 75 states and 78 transitions. Second operand 28 states. [2020-08-18 23:38:49,348 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:38:49,348 INFO L93 Difference]: Finished difference Result 100 states and 106 transitions. [2020-08-18 23:38:49,349 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-18 23:38:49,349 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 70 [2020-08-18 23:38:49,349 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:38:49,350 INFO L225 Difference]: With dead ends: 100 [2020-08-18 23:38:49,350 INFO L226 Difference]: Without dead ends: 78 [2020-08-18 23:38:49,352 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=364, Invalid=566, Unknown=0, NotChecked=0, Total=930 [2020-08-18 23:38:49,352 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-08-18 23:38:49,356 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 77. [2020-08-18 23:38:49,356 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2020-08-18 23:38:49,356 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 80 transitions. [2020-08-18 23:38:49,357 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 80 transitions. Word has length 70 [2020-08-18 23:38:49,357 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:38:49,357 INFO L479 AbstractCegarLoop]: Abstraction has 77 states and 80 transitions. [2020-08-18 23:38:49,357 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-18 23:38:49,357 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 80 transitions. [2020-08-18 23:38:49,357 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2020-08-18 23:38:49,357 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:38:49,358 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] [2020-08-18 23:38:49,358 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-18 23:38:49,358 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:38:49,358 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:38:49,358 INFO L82 PathProgramCache]: Analyzing trace with hash 1030916052, now seen corresponding path program 15 times [2020-08-18 23:38:49,358 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:38:49,358 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1957714055] [2020-08-18 23:38:49,358 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:38:49,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:49,409 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:38:49,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:49,422 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 23:38:49,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:50,724 INFO L134 CoverageAnalysis]: Checked inductivity of 534 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 23:38:50,724 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1957714055] [2020-08-18 23:38:50,724 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:38:50,724 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-18 23:38:50,725 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [162517943] [2020-08-18 23:38:50,726 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-18 23:38:50,726 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:38:50,726 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-18 23:38:50,727 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=331, Invalid=481, Unknown=0, NotChecked=0, Total=812 [2020-08-18 23:38:50,727 INFO L87 Difference]: Start difference. First operand 77 states and 80 transitions. Second operand 29 states. [2020-08-18 23:38:51,169 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:38:51,169 INFO L93 Difference]: Finished difference Result 102 states and 108 transitions. [2020-08-18 23:38:51,169 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-18 23:38:51,170 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 72 [2020-08-18 23:38:51,170 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:38:51,171 INFO L225 Difference]: With dead ends: 102 [2020-08-18 23:38:51,171 INFO L226 Difference]: Without dead ends: 80 [2020-08-18 23:38:51,172 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=391, Invalid=601, Unknown=0, NotChecked=0, Total=992 [2020-08-18 23:38:51,172 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-08-18 23:38:51,175 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 79. [2020-08-18 23:38:51,176 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-08-18 23:38:51,176 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 82 transitions. [2020-08-18 23:38:51,176 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 82 transitions. Word has length 72 [2020-08-18 23:38:51,177 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:38:51,177 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 82 transitions. [2020-08-18 23:38:51,177 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-18 23:38:51,177 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 82 transitions. [2020-08-18 23:38:51,177 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2020-08-18 23:38:51,178 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:38:51,178 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] [2020-08-18 23:38:51,178 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-18 23:38:51,178 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:38:51,178 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:38:51,178 INFO L82 PathProgramCache]: Analyzing trace with hash -1030974506, now seen corresponding path program 16 times [2020-08-18 23:38:51,179 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:38:51,179 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1196723266] [2020-08-18 23:38:51,179 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:38:51,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:51,236 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:38:51,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:51,253 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 23:38:51,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:52,689 INFO L134 CoverageAnalysis]: Checked inductivity of 581 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 23:38:52,690 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1196723266] [2020-08-18 23:38:52,690 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:38:52,690 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-18 23:38:52,690 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1195002036] [2020-08-18 23:38:52,691 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-18 23:38:52,691 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:38:52,692 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-18 23:38:52,692 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=357, Invalid=513, Unknown=0, NotChecked=0, Total=870 [2020-08-18 23:38:52,693 INFO L87 Difference]: Start difference. First operand 79 states and 82 transitions. Second operand 30 states. [2020-08-18 23:38:53,002 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:38:53,002 INFO L93 Difference]: Finished difference Result 104 states and 110 transitions. [2020-08-18 23:38:53,002 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-18 23:38:53,003 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 74 [2020-08-18 23:38:53,003 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:38:53,004 INFO L225 Difference]: With dead ends: 104 [2020-08-18 23:38:53,004 INFO L226 Difference]: Without dead ends: 82 [2020-08-18 23:38:53,005 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=419, Invalid=637, Unknown=0, NotChecked=0, Total=1056 [2020-08-18 23:38:53,005 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-08-18 23:38:53,009 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 81. [2020-08-18 23:38:53,009 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2020-08-18 23:38:53,010 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 84 transitions. [2020-08-18 23:38:53,011 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 84 transitions. Word has length 74 [2020-08-18 23:38:53,011 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:38:53,011 INFO L479 AbstractCegarLoop]: Abstraction has 81 states and 84 transitions. [2020-08-18 23:38:53,011 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-18 23:38:53,011 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 84 transitions. [2020-08-18 23:38:53,012 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2020-08-18 23:38:53,012 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:38:53,012 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] [2020-08-18 23:38:53,012 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-18 23:38:53,013 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:38:53,013 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:38:53,013 INFO L82 PathProgramCache]: Analyzing trace with hash 1767090008, now seen corresponding path program 17 times [2020-08-18 23:38:53,013 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:38:53,013 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2052474458] [2020-08-18 23:38:53,013 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:38:53,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:53,071 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:38:53,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:53,081 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 23:38:53,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:54,479 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 625 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 23:38:54,479 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2052474458] [2020-08-18 23:38:54,480 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:38:54,480 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-18 23:38:54,480 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [992526094] [2020-08-18 23:38:54,480 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-18 23:38:54,480 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:38:54,481 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-18 23:38:54,481 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=384, Invalid=546, Unknown=0, NotChecked=0, Total=930 [2020-08-18 23:38:54,481 INFO L87 Difference]: Start difference. First operand 81 states and 84 transitions. Second operand 31 states. [2020-08-18 23:38:54,904 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:38:54,904 INFO L93 Difference]: Finished difference Result 106 states and 112 transitions. [2020-08-18 23:38:54,905 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-18 23:38:54,905 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 76 [2020-08-18 23:38:54,905 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:38:54,906 INFO L225 Difference]: With dead ends: 106 [2020-08-18 23:38:54,906 INFO L226 Difference]: Without dead ends: 84 [2020-08-18 23:38:54,907 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=448, Invalid=674, Unknown=0, NotChecked=0, Total=1122 [2020-08-18 23:38:54,907 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2020-08-18 23:38:54,914 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 83. [2020-08-18 23:38:54,915 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2020-08-18 23:38:54,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 86 transitions. [2020-08-18 23:38:54,915 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 86 transitions. Word has length 76 [2020-08-18 23:38:54,919 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:38:54,919 INFO L479 AbstractCegarLoop]: Abstraction has 83 states and 86 transitions. [2020-08-18 23:38:54,919 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-18 23:38:54,919 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 86 transitions. [2020-08-18 23:38:54,920 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-08-18 23:38:54,920 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:38:54,920 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] [2020-08-18 23:38:54,920 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-18 23:38:54,921 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:38:54,921 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:38:54,921 INFO L82 PathProgramCache]: Analyzing trace with hash 2057560666, now seen corresponding path program 18 times [2020-08-18 23:38:54,921 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:38:54,921 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1603989608] [2020-08-18 23:38:54,921 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:38:54,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:54,974 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:38:54,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:54,986 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 23:38:55,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:56,469 INFO L134 CoverageAnalysis]: Checked inductivity of 681 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 23:38:56,469 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1603989608] [2020-08-18 23:38:56,470 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:38:56,470 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-18 23:38:56,470 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1453342529] [2020-08-18 23:38:56,470 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-18 23:38:56,470 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:38:56,470 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-18 23:38:56,471 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=412, Invalid=580, Unknown=0, NotChecked=0, Total=992 [2020-08-18 23:38:56,471 INFO L87 Difference]: Start difference. First operand 83 states and 86 transitions. Second operand 32 states. [2020-08-18 23:38:56,931 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:38:56,931 INFO L93 Difference]: Finished difference Result 108 states and 114 transitions. [2020-08-18 23:38:56,932 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-18 23:38:56,932 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 78 [2020-08-18 23:38:56,932 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:38:56,933 INFO L225 Difference]: With dead ends: 108 [2020-08-18 23:38:56,933 INFO L226 Difference]: Without dead ends: 86 [2020-08-18 23:38:56,935 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=478, Invalid=712, Unknown=0, NotChecked=0, Total=1190 [2020-08-18 23:38:56,935 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2020-08-18 23:38:56,938 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 85. [2020-08-18 23:38:56,939 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2020-08-18 23:38:56,939 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 88 transitions. [2020-08-18 23:38:56,939 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 88 transitions. Word has length 78 [2020-08-18 23:38:56,940 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:38:56,940 INFO L479 AbstractCegarLoop]: Abstraction has 85 states and 88 transitions. [2020-08-18 23:38:56,940 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-18 23:38:56,940 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 88 transitions. [2020-08-18 23:38:56,941 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2020-08-18 23:38:56,941 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:38:56,941 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] [2020-08-18 23:38:56,941 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-18 23:38:56,941 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:38:56,941 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:38:56,942 INFO L82 PathProgramCache]: Analyzing trace with hash 2026988764, now seen corresponding path program 19 times [2020-08-18 23:38:56,942 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:38:56,942 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [598427413] [2020-08-18 23:38:56,942 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:38:56,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:57,004 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:38:57,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:57,016 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 23:38:57,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:58,630 INFO L134 CoverageAnalysis]: Checked inductivity of 734 backedges. 0 proven. 729 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 23:38:58,630 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [598427413] [2020-08-18 23:38:58,630 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:38:58,630 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-18 23:38:58,631 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [847050208] [2020-08-18 23:38:58,631 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-18 23:38:58,631 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:38:58,631 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-18 23:38:58,632 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=441, Invalid=615, Unknown=0, NotChecked=0, Total=1056 [2020-08-18 23:38:58,632 INFO L87 Difference]: Start difference. First operand 85 states and 88 transitions. Second operand 33 states. [2020-08-18 23:38:59,088 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:38:59,089 INFO L93 Difference]: Finished difference Result 110 states and 116 transitions. [2020-08-18 23:38:59,089 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-18 23:38:59,089 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 80 [2020-08-18 23:38:59,090 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:38:59,090 INFO L225 Difference]: With dead ends: 110 [2020-08-18 23:38:59,091 INFO L226 Difference]: Without dead ends: 88 [2020-08-18 23:38:59,092 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=509, Invalid=751, Unknown=0, NotChecked=0, Total=1260 [2020-08-18 23:38:59,092 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-08-18 23:38:59,096 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 87. [2020-08-18 23:38:59,096 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2020-08-18 23:38:59,096 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 90 transitions. [2020-08-18 23:38:59,097 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 90 transitions. Word has length 80 [2020-08-18 23:38:59,097 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:38:59,097 INFO L479 AbstractCegarLoop]: Abstraction has 87 states and 90 transitions. [2020-08-18 23:38:59,097 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-18 23:38:59,097 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 90 transitions. [2020-08-18 23:38:59,098 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2020-08-18 23:38:59,098 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:38:59,098 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] [2020-08-18 23:38:59,098 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-18 23:38:59,098 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:38:59,098 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:38:59,099 INFO L82 PathProgramCache]: Analyzing trace with hash -1582805282, now seen corresponding path program 20 times [2020-08-18 23:38:59,099 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:38:59,099 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [726581642] [2020-08-18 23:38:59,099 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:38:59,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:59,147 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:38:59,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:38:59,171 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 23:38:59,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:00,805 INFO L134 CoverageAnalysis]: Checked inductivity of 789 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 23:39:00,806 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [726581642] [2020-08-18 23:39:00,806 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:00,806 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-18 23:39:00,806 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2012163640] [2020-08-18 23:39:00,806 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-18 23:39:00,806 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:00,807 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-18 23:39:00,807 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=471, Invalid=651, Unknown=0, NotChecked=0, Total=1122 [2020-08-18 23:39:00,807 INFO L87 Difference]: Start difference. First operand 87 states and 90 transitions. Second operand 34 states. [2020-08-18 23:39:01,278 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:01,278 INFO L93 Difference]: Finished difference Result 112 states and 118 transitions. [2020-08-18 23:39:01,279 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-18 23:39:01,279 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 82 [2020-08-18 23:39:01,279 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:01,280 INFO L225 Difference]: With dead ends: 112 [2020-08-18 23:39:01,280 INFO L226 Difference]: Without dead ends: 90 [2020-08-18 23:39:01,282 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 [2020-08-18 23:39:01,282 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2020-08-18 23:39:01,286 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 89. [2020-08-18 23:39:01,286 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2020-08-18 23:39:01,287 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 92 transitions. [2020-08-18 23:39:01,287 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 92 transitions. Word has length 82 [2020-08-18 23:39:01,287 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:01,287 INFO L479 AbstractCegarLoop]: Abstraction has 89 states and 92 transitions. [2020-08-18 23:39:01,288 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-18 23:39:01,288 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 92 transitions. [2020-08-18 23:39:01,288 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2020-08-18 23:39:01,288 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:01,289 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] [2020-08-18 23:39:01,289 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-18 23:39:01,289 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:01,289 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:01,289 INFO L82 PathProgramCache]: Analyzing trace with hash -261308320, now seen corresponding path program 21 times [2020-08-18 23:39:01,290 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:01,290 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1778799937] [2020-08-18 23:39:01,290 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:01,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:01,357 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:01,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:01,374 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 23:39:01,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:03,219 INFO L134 CoverageAnalysis]: Checked inductivity of 846 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 23:39:03,220 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1778799937] [2020-08-18 23:39:03,220 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:03,220 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-18 23:39:03,220 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1798092991] [2020-08-18 23:39:03,220 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-18 23:39:03,221 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:03,221 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-18 23:39:03,221 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=502, Invalid=688, Unknown=0, NotChecked=0, Total=1190 [2020-08-18 23:39:03,222 INFO L87 Difference]: Start difference. First operand 89 states and 92 transitions. Second operand 35 states. [2020-08-18 23:39:03,832 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:03,832 INFO L93 Difference]: Finished difference Result 114 states and 120 transitions. [2020-08-18 23:39:03,833 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-18 23:39:03,834 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 84 [2020-08-18 23:39:03,834 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:03,835 INFO L225 Difference]: With dead ends: 114 [2020-08-18 23:39:03,835 INFO L226 Difference]: Without dead ends: 92 [2020-08-18 23:39:03,837 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=574, Invalid=832, Unknown=0, NotChecked=0, Total=1406 [2020-08-18 23:39:03,837 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2020-08-18 23:39:03,843 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 91. [2020-08-18 23:39:03,843 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2020-08-18 23:39:03,847 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 94 transitions. [2020-08-18 23:39:03,847 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 94 transitions. Word has length 84 [2020-08-18 23:39:03,848 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:03,848 INFO L479 AbstractCegarLoop]: Abstraction has 91 states and 94 transitions. [2020-08-18 23:39:03,848 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-18 23:39:03,848 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 94 transitions. [2020-08-18 23:39:03,850 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2020-08-18 23:39:03,850 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:03,851 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] [2020-08-18 23:39:03,851 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-18 23:39:03,851 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:03,852 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:03,852 INFO L82 PathProgramCache]: Analyzing trace with hash -1613047454, now seen corresponding path program 22 times [2020-08-18 23:39:03,855 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:03,859 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [548182575] [2020-08-18 23:39:03,859 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:03,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:03,943 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:03,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:03,961 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 23:39:04,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:05,921 INFO L134 CoverageAnalysis]: Checked inductivity of 905 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 23:39:05,922 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [548182575] [2020-08-18 23:39:05,922 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:05,922 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-18 23:39:05,922 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [557820318] [2020-08-18 23:39:05,922 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-18 23:39:05,922 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:05,923 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-18 23:39:05,923 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=534, Invalid=726, Unknown=0, NotChecked=0, Total=1260 [2020-08-18 23:39:05,923 INFO L87 Difference]: Start difference. First operand 91 states and 94 transitions. Second operand 36 states. [2020-08-18 23:39:06,287 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:06,287 INFO L93 Difference]: Finished difference Result 116 states and 122 transitions. [2020-08-18 23:39:06,287 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-18 23:39:06,288 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 86 [2020-08-18 23:39:06,288 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:06,289 INFO L225 Difference]: With dead ends: 116 [2020-08-18 23:39:06,289 INFO L226 Difference]: Without dead ends: 94 [2020-08-18 23:39:06,290 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=608, Invalid=874, Unknown=0, NotChecked=0, Total=1482 [2020-08-18 23:39:06,290 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2020-08-18 23:39:06,295 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 93. [2020-08-18 23:39:06,295 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2020-08-18 23:39:06,296 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 96 transitions. [2020-08-18 23:39:06,296 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 96 transitions. Word has length 86 [2020-08-18 23:39:06,296 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:06,296 INFO L479 AbstractCegarLoop]: Abstraction has 93 states and 96 transitions. [2020-08-18 23:39:06,296 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-18 23:39:06,297 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 96 transitions. [2020-08-18 23:39:06,297 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2020-08-18 23:39:06,297 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:06,297 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] [2020-08-18 23:39:06,298 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-18 23:39:06,298 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:06,298 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:06,298 INFO L82 PathProgramCache]: Analyzing trace with hash 740735460, now seen corresponding path program 23 times [2020-08-18 23:39:06,298 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:06,299 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1312820527] [2020-08-18 23:39:06,299 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:06,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:06,373 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:06,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:06,385 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 23:39:06,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:08,424 INFO L134 CoverageAnalysis]: Checked inductivity of 966 backedges. 0 proven. 961 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 23:39:08,425 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1312820527] [2020-08-18 23:39:08,425 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:08,425 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-18 23:39:08,425 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1898553661] [2020-08-18 23:39:08,426 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-18 23:39:08,426 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:08,426 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-18 23:39:08,427 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=567, Invalid=765, Unknown=0, NotChecked=0, Total=1332 [2020-08-18 23:39:08,427 INFO L87 Difference]: Start difference. First operand 93 states and 96 transitions. Second operand 37 states. [2020-08-18 23:39:08,923 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:08,923 INFO L93 Difference]: Finished difference Result 118 states and 124 transitions. [2020-08-18 23:39:08,923 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-18 23:39:08,924 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 88 [2020-08-18 23:39:08,924 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:08,925 INFO L225 Difference]: With dead ends: 118 [2020-08-18 23:39:08,925 INFO L226 Difference]: Without dead ends: 96 [2020-08-18 23:39:08,926 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=643, Invalid=917, Unknown=0, NotChecked=0, Total=1560 [2020-08-18 23:39:08,927 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2020-08-18 23:39:08,931 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 95. [2020-08-18 23:39:08,931 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2020-08-18 23:39:08,932 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 98 transitions. [2020-08-18 23:39:08,932 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 98 transitions. Word has length 88 [2020-08-18 23:39:08,932 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:08,933 INFO L479 AbstractCegarLoop]: Abstraction has 95 states and 98 transitions. [2020-08-18 23:39:08,933 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-18 23:39:08,933 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 98 transitions. [2020-08-18 23:39:08,933 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2020-08-18 23:39:08,933 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:08,934 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] [2020-08-18 23:39:08,934 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-18 23:39:08,934 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:08,934 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:08,937 INFO L82 PathProgramCache]: Analyzing trace with hash -721649178, now seen corresponding path program 24 times [2020-08-18 23:39:08,937 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:08,937 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1045079068] [2020-08-18 23:39:08,937 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:08,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:08,997 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:08,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:09,010 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 23:39:09,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:11,145 INFO L134 CoverageAnalysis]: Checked inductivity of 1029 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 23:39:11,145 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1045079068] [2020-08-18 23:39:11,145 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:11,145 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-18 23:39:11,145 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [300141725] [2020-08-18 23:39:11,146 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-18 23:39:11,146 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:11,146 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-18 23:39:11,147 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=601, Invalid=805, Unknown=0, NotChecked=0, Total=1406 [2020-08-18 23:39:11,147 INFO L87 Difference]: Start difference. First operand 95 states and 98 transitions. Second operand 38 states. [2020-08-18 23:39:11,645 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:11,646 INFO L93 Difference]: Finished difference Result 120 states and 126 transitions. [2020-08-18 23:39:11,646 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-18 23:39:11,647 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 90 [2020-08-18 23:39:11,647 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:11,648 INFO L225 Difference]: With dead ends: 120 [2020-08-18 23:39:11,648 INFO L226 Difference]: Without dead ends: 98 [2020-08-18 23:39:11,650 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=679, Invalid=961, Unknown=0, NotChecked=0, Total=1640 [2020-08-18 23:39:11,651 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-08-18 23:39:11,666 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 97. [2020-08-18 23:39:11,666 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2020-08-18 23:39:11,667 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 100 transitions. [2020-08-18 23:39:11,667 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 100 transitions. Word has length 90 [2020-08-18 23:39:11,667 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:11,667 INFO L479 AbstractCegarLoop]: Abstraction has 97 states and 100 transitions. [2020-08-18 23:39:11,667 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-18 23:39:11,668 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 100 transitions. [2020-08-18 23:39:11,668 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2020-08-18 23:39:11,668 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:11,668 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] [2020-08-18 23:39:11,669 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-18 23:39:11,669 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:11,669 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:11,669 INFO L82 PathProgramCache]: Analyzing trace with hash -1618980504, now seen corresponding path program 25 times [2020-08-18 23:39:11,670 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:11,670 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [603142233] [2020-08-18 23:39:11,670 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:11,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:11,736 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:11,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:11,748 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 23:39:11,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:13,957 INFO L134 CoverageAnalysis]: Checked inductivity of 1094 backedges. 0 proven. 1089 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 23:39:13,957 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [603142233] [2020-08-18 23:39:13,957 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:13,957 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-18 23:39:13,957 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1164664355] [2020-08-18 23:39:13,958 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-18 23:39:13,958 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:13,958 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-18 23:39:13,959 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=636, Invalid=846, Unknown=0, NotChecked=0, Total=1482 [2020-08-18 23:39:13,959 INFO L87 Difference]: Start difference. First operand 97 states and 100 transitions. Second operand 39 states. [2020-08-18 23:39:14,343 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:14,343 INFO L93 Difference]: Finished difference Result 122 states and 128 transitions. [2020-08-18 23:39:14,344 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-18 23:39:14,344 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 92 [2020-08-18 23:39:14,344 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:14,345 INFO L225 Difference]: With dead ends: 122 [2020-08-18 23:39:14,345 INFO L226 Difference]: Without dead ends: 100 [2020-08-18 23:39:14,348 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=716, Invalid=1006, Unknown=0, NotChecked=0, Total=1722 [2020-08-18 23:39:14,348 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2020-08-18 23:39:14,354 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 99. [2020-08-18 23:39:14,354 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2020-08-18 23:39:14,355 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 102 transitions. [2020-08-18 23:39:14,355 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 102 transitions. Word has length 92 [2020-08-18 23:39:14,355 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:14,355 INFO L479 AbstractCegarLoop]: Abstraction has 99 states and 102 transitions. [2020-08-18 23:39:14,356 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-18 23:39:14,356 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 102 transitions. [2020-08-18 23:39:14,356 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2020-08-18 23:39:14,356 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:14,356 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] [2020-08-18 23:39:14,356 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-18 23:39:14,356 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:14,357 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:14,357 INFO L82 PathProgramCache]: Analyzing trace with hash -665958294, now seen corresponding path program 26 times [2020-08-18 23:39:14,357 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:14,357 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1578537800] [2020-08-18 23:39:14,357 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:14,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:14,414 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:14,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:14,430 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 23:39:14,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:16,792 INFO L134 CoverageAnalysis]: Checked inductivity of 1161 backedges. 0 proven. 1156 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 23:39:16,793 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1578537800] [2020-08-18 23:39:16,793 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:16,793 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-18 23:39:16,793 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [231287879] [2020-08-18 23:39:16,794 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-18 23:39:16,794 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:16,794 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-18 23:39:16,794 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=672, Invalid=888, Unknown=0, NotChecked=0, Total=1560 [2020-08-18 23:39:16,794 INFO L87 Difference]: Start difference. First operand 99 states and 102 transitions. Second operand 40 states. [2020-08-18 23:39:17,121 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:17,122 INFO L93 Difference]: Finished difference Result 124 states and 130 transitions. [2020-08-18 23:39:17,122 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-18 23:39:17,122 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 94 [2020-08-18 23:39:17,123 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:17,124 INFO L225 Difference]: With dead ends: 124 [2020-08-18 23:39:17,124 INFO L226 Difference]: Without dead ends: 102 [2020-08-18 23:39:17,125 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=754, Invalid=1052, Unknown=0, NotChecked=0, Total=1806 [2020-08-18 23:39:17,125 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2020-08-18 23:39:17,128 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 101. [2020-08-18 23:39:17,129 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2020-08-18 23:39:17,129 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 104 transitions. [2020-08-18 23:39:17,130 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 104 transitions. Word has length 94 [2020-08-18 23:39:17,130 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:17,130 INFO L479 AbstractCegarLoop]: Abstraction has 101 states and 104 transitions. [2020-08-18 23:39:17,130 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-18 23:39:17,130 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 104 transitions. [2020-08-18 23:39:17,131 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-08-18 23:39:17,131 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:17,131 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] [2020-08-18 23:39:17,131 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-18 23:39:17,131 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:17,132 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:17,132 INFO L82 PathProgramCache]: Analyzing trace with hash 360351468, now seen corresponding path program 27 times [2020-08-18 23:39:17,132 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:17,132 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1412880626] [2020-08-18 23:39:17,132 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:17,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:17,199 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:17,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:17,210 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 23:39:17,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:19,648 INFO L134 CoverageAnalysis]: Checked inductivity of 1230 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 23:39:19,649 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1412880626] [2020-08-18 23:39:19,649 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:19,649 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-18 23:39:19,649 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1355747176] [2020-08-18 23:39:19,649 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-18 23:39:19,650 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:19,650 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-18 23:39:19,651 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=709, Invalid=931, Unknown=0, NotChecked=0, Total=1640 [2020-08-18 23:39:19,651 INFO L87 Difference]: Start difference. First operand 101 states and 104 transitions. Second operand 41 states. [2020-08-18 23:39:20,047 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:20,047 INFO L93 Difference]: Finished difference Result 126 states and 132 transitions. [2020-08-18 23:39:20,047 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-18 23:39:20,048 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 96 [2020-08-18 23:39:20,048 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:20,049 INFO L225 Difference]: With dead ends: 126 [2020-08-18 23:39:20,049 INFO L226 Difference]: Without dead ends: 104 [2020-08-18 23:39:20,051 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=793, Invalid=1099, Unknown=0, NotChecked=0, Total=1892 [2020-08-18 23:39:20,051 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2020-08-18 23:39:20,055 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 103. [2020-08-18 23:39:20,055 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2020-08-18 23:39:20,056 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 106 transitions. [2020-08-18 23:39:20,056 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 106 transitions. Word has length 96 [2020-08-18 23:39:20,056 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:20,057 INFO L479 AbstractCegarLoop]: Abstraction has 103 states and 106 transitions. [2020-08-18 23:39:20,057 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-18 23:39:20,057 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 106 transitions. [2020-08-18 23:39:20,057 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2020-08-18 23:39:20,058 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:20,058 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] [2020-08-18 23:39:20,058 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-18 23:39:20,058 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:20,058 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:20,058 INFO L82 PathProgramCache]: Analyzing trace with hash -1198445330, now seen corresponding path program 28 times [2020-08-18 23:39:20,059 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:20,059 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [279156388] [2020-08-18 23:39:20,059 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:20,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:20,120 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:20,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:20,130 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 23:39:20,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:22,748 INFO L134 CoverageAnalysis]: Checked inductivity of 1301 backedges. 0 proven. 1296 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 23:39:22,748 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [279156388] [2020-08-18 23:39:22,748 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:22,748 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-18 23:39:22,749 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [736673713] [2020-08-18 23:39:22,749 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-18 23:39:22,749 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:22,749 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-18 23:39:22,750 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=747, Invalid=975, Unknown=0, NotChecked=0, Total=1722 [2020-08-18 23:39:22,750 INFO L87 Difference]: Start difference. First operand 103 states and 106 transitions. Second operand 42 states. [2020-08-18 23:39:23,264 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:23,264 INFO L93 Difference]: Finished difference Result 128 states and 134 transitions. [2020-08-18 23:39:23,265 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-18 23:39:23,265 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 98 [2020-08-18 23:39:23,265 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:23,266 INFO L225 Difference]: With dead ends: 128 [2020-08-18 23:39:23,266 INFO L226 Difference]: Without dead ends: 106 [2020-08-18 23:39:23,268 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=833, Invalid=1147, Unknown=0, NotChecked=0, Total=1980 [2020-08-18 23:39:23,268 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2020-08-18 23:39:23,277 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 105. [2020-08-18 23:39:23,278 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2020-08-18 23:39:23,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 108 transitions. [2020-08-18 23:39:23,279 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 108 transitions. Word has length 98 [2020-08-18 23:39:23,279 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:23,279 INFO L479 AbstractCegarLoop]: Abstraction has 105 states and 108 transitions. [2020-08-18 23:39:23,279 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-18 23:39:23,279 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 108 transitions. [2020-08-18 23:39:23,280 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2020-08-18 23:39:23,280 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:23,280 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] [2020-08-18 23:39:23,280 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-18 23:39:23,281 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:23,281 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:23,282 INFO L82 PathProgramCache]: Analyzing trace with hash -258581904, now seen corresponding path program 29 times [2020-08-18 23:39:23,282 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:23,282 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [522739171] [2020-08-18 23:39:23,282 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:23,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:23,373 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:23,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:23,394 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 23:39:23,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat