/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 false -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/array-industry-pattern/array_of_struct_ptr_flag_init.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-18 10:38:41,986 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-18 10:38:41,989 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-18 10:38:42,016 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-08-18 10:38:42,030 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 10:38:42,031 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 10:38:42,032 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 10:38:42,033 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 10:38:42,033 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 10:38:42,034 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 10:38:42,036 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 10:38:42,038 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 10:38:42,039 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 10:38:42,040 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 10:38:42,041 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 10:38:42,042 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 10:38:42,044 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-18 10:38:42,054 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 10:38:42,055 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 10:38:42,055 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 10:38:42,056 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 10:38:42,082 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 10:38:42,083 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 10:38:42,084 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 10:38:42,084 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 10:38:42,084 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 10:38:42,084 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 10:38:42,085 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 10:38:42,085 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 10:38:42,085 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 10:38:42,085 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 10:38:42,085 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 10:38:42,086 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 10:38:42,086 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 10:38:42,086 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 10:38:42,086 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 10:38:42,086 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 10:38:42,086 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 10:38:42,087 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 10:38:42,087 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 10:38:42,087 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 10:38:42,087 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 10:38:42,087 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 10:38:42,088 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 10:38:42,088 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 10:38:42,088 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 10:38:42,088 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 10:38:42,088 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 10:38:42,089 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 10:38:42,089 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 10:38:42,089 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 -> false [2020-08-18 10:38:42,386 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 10:38:42,398 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 10:38:42,401 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 10:38:42,403 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 10:38:42,403 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 10:38:42,404 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-industry-pattern/array_of_struct_ptr_flag_init.i [2020-08-18 10:38:42,465 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/206fb0cfb/9040675e56c84944942ca6063aa6d118/FLAG77e4e3cac [2020-08-18 10:38:42,890 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 10:38:42,891 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/array-industry-pattern/array_of_struct_ptr_flag_init.i [2020-08-18 10:38:42,898 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/206fb0cfb/9040675e56c84944942ca6063aa6d118/FLAG77e4e3cac [2020-08-18 10:38:43,338 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/206fb0cfb/9040675e56c84944942ca6063aa6d118 [2020-08-18 10:38:43,349 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 10:38:43,351 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 10:38:43,352 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 10:38:43,353 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 10:38:43,356 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 10:38:43,358 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 10:38:43" (1/1) ... [2020-08-18 10:38:43,361 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4ab1dbf7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:38:43, skipping insertion in model container [2020-08-18 10:38:43,361 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 10:38:43" (1/1) ... [2020-08-18 10:38:43,370 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 10:38:43,388 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 10:38:43,689 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 10:38:43,701 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 10:38:43,728 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 10:38:43,748 INFO L208 MainTranslator]: Completed translation [2020-08-18 10:38:43,749 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:38:43 WrapperNode [2020-08-18 10:38:43,749 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 10:38:43,750 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 10:38:43,750 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 10:38:43,750 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 10:38:43,914 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:38:43" (1/1) ... [2020-08-18 10:38:43,916 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:38:43" (1/1) ... [2020-08-18 10:38:43,927 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:38:43" (1/1) ... [2020-08-18 10:38:43,928 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:38:43" (1/1) ... [2020-08-18 10:38:43,947 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:38:43" (1/1) ... [2020-08-18 10:38:43,956 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:38:43" (1/1) ... [2020-08-18 10:38:43,962 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:38:43" (1/1) ... [2020-08-18 10:38:43,968 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 10:38:43,968 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 10:38:43,968 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 10:38:43,968 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 10:38:43,969 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:38:43" (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 10:38:44,030 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 10:38:44,030 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 10:38:44,030 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-18 10:38:44,031 INFO L138 BoogieDeclarations]: Found implementation of procedure init [2020-08-18 10:38:44,031 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 10:38:44,031 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2020-08-18 10:38:44,031 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 10:38:44,031 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-18 10:38:44,031 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-08-18 10:38:44,031 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-08-18 10:38:44,032 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-08-18 10:38:44,032 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 10:38:44,032 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-18 10:38:44,032 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-08-18 10:38:44,032 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-18 10:38:44,032 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 10:38:44,033 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 10:38:44,261 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 10:38:44,261 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-08-18 10:38:44,265 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 10:38:44 BoogieIcfgContainer [2020-08-18 10:38:44,265 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 10:38:44,266 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 10:38:44,266 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 10:38:44,269 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 10:38:44,270 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 10:38:43" (1/3) ... [2020-08-18 10:38:44,271 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5cc9d1ba and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 10:38:44, skipping insertion in model container [2020-08-18 10:38:44,271 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:38:43" (2/3) ... [2020-08-18 10:38:44,271 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5cc9d1ba and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 10:38:44, skipping insertion in model container [2020-08-18 10:38:44,272 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 10:38:44" (3/3) ... [2020-08-18 10:38:44,273 INFO L109 eAbstractionObserver]: Analyzing ICFG array_of_struct_ptr_flag_init.i [2020-08-18 10:38:44,286 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 10:38:44,294 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-18 10:38:44,315 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-18 10:38:44,343 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 10:38:44,344 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 10:38:44,344 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 10:38:44,344 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 10:38:44,345 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 10:38:44,345 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 10:38:44,345 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 10:38:44,345 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 10:38:44,366 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-08-18 10:38:44,373 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-18 10:38:44,374 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 10:38:44,375 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 10:38:44,375 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 10:38:44,382 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 10:38:44,382 INFO L82 PathProgramCache]: Analyzing trace with hash -850547107, now seen corresponding path program 1 times [2020-08-18 10:38:44,392 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 10:38:44,392 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [151456355] [2020-08-18 10:38:44,393 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 10:38:44,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:38:44,610 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 10:38:44,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:38:44,655 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 10:38:44,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:38:44,670 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 10:38:44,671 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [151456355] [2020-08-18 10:38:44,673 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 10:38:44,674 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 10:38:44,675 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [434143382] [2020-08-18 10:38:44,680 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 10:38:44,680 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 10:38:44,694 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 10:38:44,695 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 10:38:44,697 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 4 states. [2020-08-18 10:38:44,845 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 10:38:44,845 INFO L93 Difference]: Finished difference Result 59 states and 76 transitions. [2020-08-18 10:38:44,846 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-18 10:38:44,847 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 20 [2020-08-18 10:38:44,848 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 10:38:44,859 INFO L225 Difference]: With dead ends: 59 [2020-08-18 10:38:44,859 INFO L226 Difference]: Without dead ends: 31 [2020-08-18 10:38:44,863 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 10:38:44,882 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-18 10:38:44,902 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 28. [2020-08-18 10:38:44,904 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-18 10:38:44,905 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 32 transitions. [2020-08-18 10:38:44,907 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 32 transitions. Word has length 20 [2020-08-18 10:38:44,907 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 10:38:44,907 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 32 transitions. [2020-08-18 10:38:44,908 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 10:38:44,908 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 32 transitions. [2020-08-18 10:38:44,909 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-18 10:38:44,909 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 10:38:44,909 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 10:38:44,910 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 10:38:44,910 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 10:38:44,910 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 10:38:44,911 INFO L82 PathProgramCache]: Analyzing trace with hash 1453375688, now seen corresponding path program 1 times [2020-08-18 10:38:44,911 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 10:38:44,911 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [906915122] [2020-08-18 10:38:44,912 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 10:38:44,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:38:44,999 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 10:38:45,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:38:45,021 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 10:38:45,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:38:45,122 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 10:38:45,122 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [906915122] [2020-08-18 10:38:45,123 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 10:38:45,123 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-08-18 10:38:45,123 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1308535693] [2020-08-18 10:38:45,125 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 10:38:45,125 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 10:38:45,126 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 10:38:45,126 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-08-18 10:38:45,126 INFO L87 Difference]: Start difference. First operand 28 states and 32 transitions. Second operand 6 states. [2020-08-18 10:38:45,353 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 10:38:45,353 INFO L93 Difference]: Finished difference Result 48 states and 56 transitions. [2020-08-18 10:38:45,354 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-18 10:38:45,354 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2020-08-18 10:38:45,354 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 10:38:45,355 INFO L225 Difference]: With dead ends: 48 [2020-08-18 10:38:45,355 INFO L226 Difference]: Without dead ends: 30 [2020-08-18 10:38:45,357 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 10:38:45,358 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-18 10:38:45,364 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2020-08-18 10:38:45,364 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-18 10:38:45,366 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2020-08-18 10:38:45,366 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 20 [2020-08-18 10:38:45,366 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 10:38:45,366 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2020-08-18 10:38:45,367 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 10:38:45,367 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2020-08-18 10:38:45,368 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-18 10:38:45,368 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 10:38:45,368 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 10:38:45,368 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 10:38:45,369 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 10:38:45,369 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 10:38:45,369 INFO L82 PathProgramCache]: Analyzing trace with hash -169907062, now seen corresponding path program 1 times [2020-08-18 10:38:45,369 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 10:38:45,370 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [589895305] [2020-08-18 10:38:45,370 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 10:38:45,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:38:45,435 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 10:38:45,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:38:45,454 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 10:38:45,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:38:45,590 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 10:38:45,591 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [589895305] [2020-08-18 10:38:45,591 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 10:38:45,591 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-18 10:38:45,592 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1949000979] [2020-08-18 10:38:45,592 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-18 10:38:45,592 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 10:38:45,593 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-18 10:38:45,593 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-08-18 10:38:45,593 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand 7 states. [2020-08-18 10:38:45,814 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 10:38:45,814 INFO L93 Difference]: Finished difference Result 50 states and 58 transitions. [2020-08-18 10:38:45,815 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-18 10:38:45,815 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 22 [2020-08-18 10:38:45,816 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 10:38:45,817 INFO L225 Difference]: With dead ends: 50 [2020-08-18 10:38:45,817 INFO L226 Difference]: Without dead ends: 32 [2020-08-18 10:38:45,818 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2020-08-18 10:38:45,818 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-18 10:38:45,824 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2020-08-18 10:38:45,824 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-18 10:38:45,825 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 35 transitions. [2020-08-18 10:38:45,826 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 35 transitions. Word has length 22 [2020-08-18 10:38:45,826 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 10:38:45,826 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 35 transitions. [2020-08-18 10:38:45,826 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-18 10:38:45,826 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 35 transitions. [2020-08-18 10:38:45,827 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-18 10:38:45,828 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 10:38:45,828 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 10:38:45,828 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-18 10:38:45,828 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 10:38:45,829 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 10:38:45,829 INFO L82 PathProgramCache]: Analyzing trace with hash -1071501364, now seen corresponding path program 2 times [2020-08-18 10:38:45,829 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 10:38:45,830 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [187952085] [2020-08-18 10:38:45,830 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 10:38:45,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:38:45,888 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 10:38:45,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:38:45,908 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 10:38:45,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:38:46,097 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 10:38:46,097 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [187952085] [2020-08-18 10:38:46,098 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 10:38:46,098 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-18 10:38:46,099 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [289798167] [2020-08-18 10:38:46,099 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-18 10:38:46,100 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 10:38:46,100 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-18 10:38:46,100 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2020-08-18 10:38:46,101 INFO L87 Difference]: Start difference. First operand 31 states and 35 transitions. Second operand 8 states. [2020-08-18 10:38:46,325 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 10:38:46,326 INFO L93 Difference]: Finished difference Result 52 states and 60 transitions. [2020-08-18 10:38:46,327 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-18 10:38:46,327 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 24 [2020-08-18 10:38:46,327 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 10:38:46,328 INFO L225 Difference]: With dead ends: 52 [2020-08-18 10:38:46,328 INFO L226 Difference]: Without dead ends: 34 [2020-08-18 10:38:46,329 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 10:38:46,330 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-18 10:38:46,339 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2020-08-18 10:38:46,339 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-18 10:38:46,341 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 37 transitions. [2020-08-18 10:38:46,341 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 37 transitions. Word has length 24 [2020-08-18 10:38:46,341 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 10:38:46,342 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 37 transitions. [2020-08-18 10:38:46,343 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-18 10:38:46,343 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 37 transitions. [2020-08-18 10:38:46,345 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-18 10:38:46,345 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 10:38:46,345 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 10:38:46,346 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-18 10:38:46,346 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 10:38:46,346 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 10:38:46,346 INFO L82 PathProgramCache]: Analyzing trace with hash 79768206, now seen corresponding path program 3 times [2020-08-18 10:38:46,347 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 10:38:46,347 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1961803610] [2020-08-18 10:38:46,347 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 10:38:46,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:38:46,442 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 10:38:46,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:38:46,456 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 10:38:46,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:38:46,630 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 10:38:46,631 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1961803610] [2020-08-18 10:38:46,631 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 10:38:46,631 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-18 10:38:46,632 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [48382125] [2020-08-18 10:38:46,632 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-18 10:38:46,633 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 10:38:46,633 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-18 10:38:46,634 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-18 10:38:46,634 INFO L87 Difference]: Start difference. First operand 33 states and 37 transitions. Second operand 9 states. [2020-08-18 10:38:46,832 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 10:38:46,833 INFO L93 Difference]: Finished difference Result 54 states and 62 transitions. [2020-08-18 10:38:46,833 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-18 10:38:46,833 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-08-18 10:38:46,833 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 10:38:46,834 INFO L225 Difference]: With dead ends: 54 [2020-08-18 10:38:46,834 INFO L226 Difference]: Without dead ends: 36 [2020-08-18 10:38:46,835 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 10:38:46,835 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-18 10:38:46,840 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2020-08-18 10:38:46,840 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-18 10:38:46,841 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2020-08-18 10:38:46,841 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 26 [2020-08-18 10:38:46,842 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 10:38:46,842 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2020-08-18 10:38:46,842 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-18 10:38:46,842 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2020-08-18 10:38:46,843 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-18 10:38:46,843 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 10:38:46,843 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 10:38:46,843 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-18 10:38:46,844 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 10:38:46,844 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 10:38:46,844 INFO L82 PathProgramCache]: Analyzing trace with hash -1651737392, now seen corresponding path program 4 times [2020-08-18 10:38:46,844 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 10:38:46,845 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2112111897] [2020-08-18 10:38:46,845 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 10:38:46,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:38:46,883 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 10:38:46,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:38:46,898 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 10:38:46,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:38:47,122 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 10:38:47,123 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2112111897] [2020-08-18 10:38:47,123 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 10:38:47,123 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-18 10:38:47,124 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1454985825] [2020-08-18 10:38:47,130 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-18 10:38:47,131 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 10:38:47,131 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-18 10:38:47,131 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2020-08-18 10:38:47,131 INFO L87 Difference]: Start difference. First operand 35 states and 39 transitions. Second operand 10 states. [2020-08-18 10:38:47,312 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 10:38:47,312 INFO L93 Difference]: Finished difference Result 56 states and 64 transitions. [2020-08-18 10:38:47,313 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-18 10:38:47,314 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 28 [2020-08-18 10:38:47,314 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 10:38:47,315 INFO L225 Difference]: With dead ends: 56 [2020-08-18 10:38:47,315 INFO L226 Difference]: Without dead ends: 38 [2020-08-18 10:38:47,316 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 10:38:47,316 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-18 10:38:47,324 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2020-08-18 10:38:47,325 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-18 10:38:47,328 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 41 transitions. [2020-08-18 10:38:47,328 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 41 transitions. Word has length 28 [2020-08-18 10:38:47,329 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 10:38:47,329 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 41 transitions. [2020-08-18 10:38:47,329 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-18 10:38:47,329 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 41 transitions. [2020-08-18 10:38:47,331 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-18 10:38:47,331 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 10:38:47,331 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 10:38:47,331 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-18 10:38:47,331 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 10:38:47,332 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 10:38:47,332 INFO L82 PathProgramCache]: Analyzing trace with hash 818693778, now seen corresponding path program 5 times [2020-08-18 10:38:47,332 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 10:38:47,332 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1650272369] [2020-08-18 10:38:47,333 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 10:38:47,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:38:47,395 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 10:38:47,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:38:47,412 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 10:38:47,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:38:47,663 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 10:38:47,664 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1650272369] [2020-08-18 10:38:47,664 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 10:38:47,664 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-18 10:38:47,664 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1136393185] [2020-08-18 10:38:47,665 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-18 10:38:47,665 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 10:38:47,665 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-18 10:38:47,665 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2020-08-18 10:38:47,666 INFO L87 Difference]: Start difference. First operand 37 states and 41 transitions. Second operand 11 states. [2020-08-18 10:38:47,841 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 10:38:47,841 INFO L93 Difference]: Finished difference Result 58 states and 66 transitions. [2020-08-18 10:38:47,842 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-18 10:38:47,842 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 30 [2020-08-18 10:38:47,842 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 10:38:47,843 INFO L225 Difference]: With dead ends: 58 [2020-08-18 10:38:47,843 INFO L226 Difference]: Without dead ends: 40 [2020-08-18 10:38:47,844 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=58, Invalid=124, Unknown=0, NotChecked=0, Total=182 [2020-08-18 10:38:47,844 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-18 10:38:47,848 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2020-08-18 10:38:47,848 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-18 10:38:47,849 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 43 transitions. [2020-08-18 10:38:47,849 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 43 transitions. Word has length 30 [2020-08-18 10:38:47,849 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 10:38:47,849 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 43 transitions. [2020-08-18 10:38:47,850 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-18 10:38:47,850 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 43 transitions. [2020-08-18 10:38:47,851 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-18 10:38:47,851 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 10:38:47,851 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 10:38:47,851 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-18 10:38:47,851 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 10:38:47,851 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 10:38:47,852 INFO L82 PathProgramCache]: Analyzing trace with hash -213866540, now seen corresponding path program 6 times [2020-08-18 10:38:47,852 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 10:38:47,852 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2122764532] [2020-08-18 10:38:47,852 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 10:38:47,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:38:47,887 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 10:38:47,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:38:47,897 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 10:38:47,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:38:48,144 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 10:38:48,145 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2122764532] [2020-08-18 10:38:48,145 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 10:38:48,145 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-18 10:38:48,146 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [825391951] [2020-08-18 10:38:48,146 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-18 10:38:48,146 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 10:38:48,146 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-18 10:38:48,147 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=90, Unknown=0, NotChecked=0, Total=132 [2020-08-18 10:38:48,147 INFO L87 Difference]: Start difference. First operand 39 states and 43 transitions. Second operand 12 states. [2020-08-18 10:38:48,334 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 10:38:48,335 INFO L93 Difference]: Finished difference Result 60 states and 68 transitions. [2020-08-18 10:38:48,335 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-18 10:38:48,335 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 32 [2020-08-18 10:38:48,335 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 10:38:48,336 INFO L225 Difference]: With dead ends: 60 [2020-08-18 10:38:48,336 INFO L226 Difference]: Without dead ends: 42 [2020-08-18 10:38:48,337 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=68, Invalid=142, Unknown=0, NotChecked=0, Total=210 [2020-08-18 10:38:48,338 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-18 10:38:48,342 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2020-08-18 10:38:48,342 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-18 10:38:48,343 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 45 transitions. [2020-08-18 10:38:48,343 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 45 transitions. Word has length 32 [2020-08-18 10:38:48,343 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 10:38:48,343 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 45 transitions. [2020-08-18 10:38:48,343 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-18 10:38:48,344 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 45 transitions. [2020-08-18 10:38:48,344 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-18 10:38:48,345 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 10:38:48,345 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 10:38:48,345 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-18 10:38:48,345 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 10:38:48,345 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 10:38:48,346 INFO L82 PathProgramCache]: Analyzing trace with hash -366886762, now seen corresponding path program 7 times [2020-08-18 10:38:48,346 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 10:38:48,346 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1103759681] [2020-08-18 10:38:48,346 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 10:38:48,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:38:48,405 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 10:38:48,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:38:48,420 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 10:38:48,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:38:48,713 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 10:38:48,713 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1103759681] [2020-08-18 10:38:48,714 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 10:38:48,714 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-18 10:38:48,717 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1053779614] [2020-08-18 10:38:48,717 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-18 10:38:48,718 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 10:38:48,718 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-18 10:38:48,719 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=105, Unknown=0, NotChecked=0, Total=156 [2020-08-18 10:38:48,719 INFO L87 Difference]: Start difference. First operand 41 states and 45 transitions. Second operand 13 states. [2020-08-18 10:38:48,927 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 10:38:48,927 INFO L93 Difference]: Finished difference Result 62 states and 70 transitions. [2020-08-18 10:38:48,928 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-18 10:38:48,928 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 34 [2020-08-18 10:38:48,928 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 10:38:48,929 INFO L225 Difference]: With dead ends: 62 [2020-08-18 10:38:48,929 INFO L226 Difference]: Without dead ends: 44 [2020-08-18 10:38:48,930 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=79, Invalid=161, Unknown=0, NotChecked=0, Total=240 [2020-08-18 10:38:48,930 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-18 10:38:48,934 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2020-08-18 10:38:48,934 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-18 10:38:48,935 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 47 transitions. [2020-08-18 10:38:48,935 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 47 transitions. Word has length 34 [2020-08-18 10:38:48,936 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 10:38:48,936 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 47 transitions. [2020-08-18 10:38:48,936 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-18 10:38:48,936 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 47 transitions. [2020-08-18 10:38:48,937 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-18 10:38:48,937 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 10:38:48,937 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 10:38:48,937 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-18 10:38:48,937 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 10:38:48,938 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 10:38:48,938 INFO L82 PathProgramCache]: Analyzing trace with hash -1390432040, now seen corresponding path program 8 times [2020-08-18 10:38:48,938 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 10:38:48,938 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [467525723] [2020-08-18 10:38:48,939 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 10:38:48,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:38:48,970 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 10:38:48,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:38:48,982 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 10:38:48,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:38:49,352 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 10:38:49,353 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [467525723] [2020-08-18 10:38:49,353 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 10:38:49,353 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-18 10:38:49,353 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [648592393] [2020-08-18 10:38:49,354 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-18 10:38:49,355 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 10:38:49,355 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-18 10:38:49,355 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2020-08-18 10:38:49,356 INFO L87 Difference]: Start difference. First operand 43 states and 47 transitions. Second operand 14 states. [2020-08-18 10:38:49,568 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 10:38:49,568 INFO L93 Difference]: Finished difference Result 64 states and 72 transitions. [2020-08-18 10:38:49,569 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-18 10:38:49,569 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 36 [2020-08-18 10:38:49,569 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 10:38:49,570 INFO L225 Difference]: With dead ends: 64 [2020-08-18 10:38:49,570 INFO L226 Difference]: Without dead ends: 46 [2020-08-18 10:38:49,571 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=91, Invalid=181, Unknown=0, NotChecked=0, Total=272 [2020-08-18 10:38:49,571 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-18 10:38:49,578 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2020-08-18 10:38:49,579 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-18 10:38:49,581 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 49 transitions. [2020-08-18 10:38:49,582 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 49 transitions. Word has length 36 [2020-08-18 10:38:49,582 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 10:38:49,582 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 49 transitions. [2020-08-18 10:38:49,582 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-18 10:38:49,582 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 49 transitions. [2020-08-18 10:38:49,584 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-18 10:38:49,584 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 10:38:49,585 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 10:38:49,585 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-18 10:38:49,585 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 10:38:49,585 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 10:38:49,585 INFO L82 PathProgramCache]: Analyzing trace with hash -1469933414, now seen corresponding path program 9 times [2020-08-18 10:38:49,586 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 10:38:49,586 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [515505855] [2020-08-18 10:38:49,586 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 10:38:49,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:38:49,623 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 10:38:49,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:38:49,640 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 10:38:49,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:38:49,652 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 10:38:49,653 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [515505855] [2020-08-18 10:38:49,653 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 10:38:49,653 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-18 10:38:49,654 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1136891758] [2020-08-18 10:38:49,654 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 10:38:49,654 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 10:38:49,654 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 10:38:49,655 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-18 10:38:49,655 INFO L87 Difference]: Start difference. First operand 45 states and 49 transitions. Second operand 5 states. [2020-08-18 10:38:49,731 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 10:38:49,731 INFO L93 Difference]: Finished difference Result 65 states and 74 transitions. [2020-08-18 10:38:49,731 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-18 10:38:49,732 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 38 [2020-08-18 10:38:49,732 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 10:38:49,734 INFO L225 Difference]: With dead ends: 65 [2020-08-18 10:38:49,735 INFO L226 Difference]: Without dead ends: 53 [2020-08-18 10:38:49,735 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 10:38:49,735 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-08-18 10:38:49,750 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 46. [2020-08-18 10:38:49,750 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-18 10:38:49,751 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 50 transitions. [2020-08-18 10:38:49,751 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 50 transitions. Word has length 38 [2020-08-18 10:38:49,751 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 10:38:49,751 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 50 transitions. [2020-08-18 10:38:49,752 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 10:38:49,752 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 50 transitions. [2020-08-18 10:38:49,752 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-18 10:38:49,752 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 10:38:49,753 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 10:38:49,753 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-18 10:38:49,753 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 10:38:49,753 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 10:38:49,753 INFO L82 PathProgramCache]: Analyzing trace with hash -1568016950, now seen corresponding path program 1 times [2020-08-18 10:38:49,754 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 10:38:49,754 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1128473788] [2020-08-18 10:38:49,754 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 10:38:49,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:38:49,793 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 10:38:49,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:38:49,806 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 10:38:49,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:38:49,819 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 10:38:49,819 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1128473788] [2020-08-18 10:38:49,819 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 10:38:49,820 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-18 10:38:49,820 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1869747531] [2020-08-18 10:38:49,820 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 10:38:49,821 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 10:38:49,821 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 10:38:49,821 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-08-18 10:38:49,821 INFO L87 Difference]: Start difference. First operand 46 states and 50 transitions. Second operand 6 states. [2020-08-18 10:38:49,917 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 10:38:49,917 INFO L93 Difference]: Finished difference Result 73 states and 85 transitions. [2020-08-18 10:38:49,917 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 10:38:49,918 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 41 [2020-08-18 10:38:49,918 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 10:38:49,919 INFO L225 Difference]: With dead ends: 73 [2020-08-18 10:38:49,919 INFO L226 Difference]: Without dead ends: 61 [2020-08-18 10:38:49,919 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 10:38:49,920 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-08-18 10:38:49,925 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 49. [2020-08-18 10:38:49,925 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-18 10:38:49,926 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 54 transitions. [2020-08-18 10:38:49,926 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 54 transitions. Word has length 41 [2020-08-18 10:38:49,927 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 10:38:49,927 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 54 transitions. [2020-08-18 10:38:49,927 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 10:38:49,927 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 54 transitions. [2020-08-18 10:38:49,928 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-18 10:38:49,928 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 10:38:49,928 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 10:38:49,928 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-18 10:38:49,928 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 10:38:49,928 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 10:38:49,929 INFO L82 PathProgramCache]: Analyzing trace with hash 1298090650, now seen corresponding path program 2 times [2020-08-18 10:38:49,929 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 10:38:49,929 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1712029759] [2020-08-18 10:38:49,929 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 10:38:49,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:38:49,981 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 10:38:49,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:38:49,999 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 10:38:50,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:38:50,014 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 10:38:50,015 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1712029759] [2020-08-18 10:38:50,015 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 10:38:50,015 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-18 10:38:50,016 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1882592087] [2020-08-18 10:38:50,016 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 10:38:50,017 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 10:38:50,017 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 10:38:50,017 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-18 10:38:50,017 INFO L87 Difference]: Start difference. First operand 49 states and 54 transitions. Second operand 5 states. [2020-08-18 10:38:50,108 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 10:38:50,108 INFO L93 Difference]: Finished difference Result 69 states and 78 transitions. [2020-08-18 10:38:50,108 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-18 10:38:50,109 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 44 [2020-08-18 10:38:50,109 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 10:38:50,110 INFO L225 Difference]: With dead ends: 69 [2020-08-18 10:38:50,110 INFO L226 Difference]: Without dead ends: 49 [2020-08-18 10:38:50,110 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 10:38:50,111 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-18 10:38:50,115 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-18 10:38:50,115 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-18 10:38:50,115 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 52 transitions. [2020-08-18 10:38:50,116 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 52 transitions. Word has length 44 [2020-08-18 10:38:50,116 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 10:38:50,116 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 52 transitions. [2020-08-18 10:38:50,116 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 10:38:50,116 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 52 transitions. [2020-08-18 10:38:50,117 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-18 10:38:50,117 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 10:38:50,117 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 10:38:50,118 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-18 10:38:50,118 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 10:38:50,118 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 10:38:50,118 INFO L82 PathProgramCache]: Analyzing trace with hash 318257626, now seen corresponding path program 1 times [2020-08-18 10:38:50,119 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 10:38:50,119 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1013266977] [2020-08-18 10:38:50,119 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 10:38:50,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:38:50,158 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 10:38:50,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:38:50,174 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 10:38:50,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:38:50,600 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 10:38:50,600 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1013266977] [2020-08-18 10:38:50,602 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 10:38:50,602 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-18 10:38:50,602 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [358721013] [2020-08-18 10:38:50,603 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-18 10:38:50,603 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 10:38:50,604 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-18 10:38:50,604 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=138, Unknown=0, NotChecked=0, Total=210 [2020-08-18 10:38:50,604 INFO L87 Difference]: Start difference. First operand 49 states and 52 transitions. Second operand 15 states. [2020-08-18 10:38:50,852 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 10:38:50,852 INFO L93 Difference]: Finished difference Result 74 states and 80 transitions. [2020-08-18 10:38:50,853 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-18 10:38:50,853 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 44 [2020-08-18 10:38:50,853 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 10:38:50,854 INFO L225 Difference]: With dead ends: 74 [2020-08-18 10:38:50,854 INFO L226 Difference]: Without dead ends: 52 [2020-08-18 10:38:50,855 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 10:38:50,855 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-18 10:38:50,859 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2020-08-18 10:38:50,859 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-18 10:38:50,860 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 54 transitions. [2020-08-18 10:38:50,860 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 54 transitions. Word has length 44 [2020-08-18 10:38:50,860 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 10:38:50,860 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 54 transitions. [2020-08-18 10:38:50,860 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-18 10:38:50,861 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 54 transitions. [2020-08-18 10:38:50,861 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-18 10:38:50,861 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 10:38:50,861 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 10:38:50,862 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-18 10:38:50,862 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 10:38:50,862 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 10:38:50,862 INFO L82 PathProgramCache]: Analyzing trace with hash -935313508, now seen corresponding path program 2 times [2020-08-18 10:38:50,862 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 10:38:50,863 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [560772876] [2020-08-18 10:38:50,863 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 10:38:50,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:38:50,916 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 10:38:50,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:38:50,927 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 10:38:50,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:38:51,383 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 10:38:51,384 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [560772876] [2020-08-18 10:38:51,384 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 10:38:51,384 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-18 10:38:51,384 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1151262471] [2020-08-18 10:38:51,385 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-18 10:38:51,385 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 10:38:51,385 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-18 10:38:51,385 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=156, Unknown=0, NotChecked=0, Total=240 [2020-08-18 10:38:51,385 INFO L87 Difference]: Start difference. First operand 51 states and 54 transitions. Second operand 16 states. [2020-08-18 10:38:51,611 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 10:38:51,611 INFO L93 Difference]: Finished difference Result 76 states and 82 transitions. [2020-08-18 10:38:51,611 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-18 10:38:51,611 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 46 [2020-08-18 10:38:51,611 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 10:38:51,612 INFO L225 Difference]: With dead ends: 76 [2020-08-18 10:38:51,612 INFO L226 Difference]: Without dead ends: 54 [2020-08-18 10:38:51,613 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=118, Invalid=224, Unknown=0, NotChecked=0, Total=342 [2020-08-18 10:38:51,613 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-18 10:38:51,617 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2020-08-18 10:38:51,618 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-18 10:38:51,619 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 56 transitions. [2020-08-18 10:38:51,619 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 56 transitions. Word has length 46 [2020-08-18 10:38:51,620 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 10:38:51,620 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 56 transitions. [2020-08-18 10:38:51,620 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-18 10:38:51,620 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 56 transitions. [2020-08-18 10:38:51,620 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-18 10:38:51,621 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 10:38:51,621 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 10:38:51,621 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-18 10:38:51,621 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 10:38:51,621 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 10:38:51,622 INFO L82 PathProgramCache]: Analyzing trace with hash 1268636894, now seen corresponding path program 3 times [2020-08-18 10:38:51,622 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 10:38:51,622 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1350721218] [2020-08-18 10:38:51,622 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 10:38:51,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:38:51,655 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 10:38:51,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:38:51,665 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 10:38:51,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:38:52,160 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 10:38:52,161 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1350721218] [2020-08-18 10:38:52,161 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 10:38:52,161 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-18 10:38:52,161 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [385230963] [2020-08-18 10:38:52,162 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-18 10:38:52,162 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 10:38:52,162 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-18 10:38:52,163 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=175, Unknown=0, NotChecked=0, Total=272 [2020-08-18 10:38:52,163 INFO L87 Difference]: Start difference. First operand 53 states and 56 transitions. Second operand 17 states. [2020-08-18 10:38:52,441 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 10:38:52,441 INFO L93 Difference]: Finished difference Result 78 states and 84 transitions. [2020-08-18 10:38:52,441 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-18 10:38:52,442 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 48 [2020-08-18 10:38:52,442 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 10:38:52,443 INFO L225 Difference]: With dead ends: 78 [2020-08-18 10:38:52,443 INFO L226 Difference]: Without dead ends: 56 [2020-08-18 10:38:52,444 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=133, Invalid=247, Unknown=0, NotChecked=0, Total=380 [2020-08-18 10:38:52,445 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-08-18 10:38:52,456 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2020-08-18 10:38:52,456 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-18 10:38:52,457 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 58 transitions. [2020-08-18 10:38:52,457 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 58 transitions. Word has length 48 [2020-08-18 10:38:52,457 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 10:38:52,458 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 58 transitions. [2020-08-18 10:38:52,458 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-18 10:38:52,458 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 58 transitions. [2020-08-18 10:38:52,458 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-18 10:38:52,459 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 10:38:52,462 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 10:38:52,462 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-18 10:38:52,462 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 10:38:52,463 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 10:38:52,463 INFO L82 PathProgramCache]: Analyzing trace with hash 1846096288, now seen corresponding path program 4 times [2020-08-18 10:38:52,463 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 10:38:52,463 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [748116909] [2020-08-18 10:38:52,464 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 10:38:52,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:38:52,522 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 10:38:52,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:38:52,533 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 10:38:52,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:38:53,039 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 10:38:53,040 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [748116909] [2020-08-18 10:38:53,040 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 10:38:53,040 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-18 10:38:53,040 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1931445772] [2020-08-18 10:38:53,041 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-18 10:38:53,041 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 10:38:53,041 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-18 10:38:53,042 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=195, Unknown=0, NotChecked=0, Total=306 [2020-08-18 10:38:53,042 INFO L87 Difference]: Start difference. First operand 55 states and 58 transitions. Second operand 18 states. [2020-08-18 10:38:53,284 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 10:38:53,284 INFO L93 Difference]: Finished difference Result 80 states and 86 transitions. [2020-08-18 10:38:53,284 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-18 10:38:53,284 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 50 [2020-08-18 10:38:53,285 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 10:38:53,285 INFO L225 Difference]: With dead ends: 80 [2020-08-18 10:38:53,285 INFO L226 Difference]: Without dead ends: 58 [2020-08-18 10:38:53,286 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=149, Invalid=271, Unknown=0, NotChecked=0, Total=420 [2020-08-18 10:38:53,287 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-18 10:38:53,293 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2020-08-18 10:38:53,294 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-18 10:38:53,296 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 60 transitions. [2020-08-18 10:38:53,296 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 60 transitions. Word has length 50 [2020-08-18 10:38:53,296 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 10:38:53,296 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 60 transitions. [2020-08-18 10:38:53,297 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-18 10:38:53,297 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 60 transitions. [2020-08-18 10:38:53,299 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-18 10:38:53,299 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 10:38:53,299 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 10:38:53,300 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-18 10:38:53,300 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 10:38:53,300 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 10:38:53,301 INFO L82 PathProgramCache]: Analyzing trace with hash -1561174558, now seen corresponding path program 5 times [2020-08-18 10:38:53,301 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 10:38:53,302 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [17244229] [2020-08-18 10:38:53,302 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 10:38:53,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:38:53,366 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 10:38:53,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:38:53,379 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 10:38:53,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:38:53,959 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 10:38:53,959 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [17244229] [2020-08-18 10:38:53,960 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 10:38:53,960 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-18 10:38:53,960 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1431338151] [2020-08-18 10:38:53,962 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-18 10:38:53,963 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 10:38:53,964 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-18 10:38:53,967 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=216, Unknown=0, NotChecked=0, Total=342 [2020-08-18 10:38:53,968 INFO L87 Difference]: Start difference. First operand 57 states and 60 transitions. Second operand 19 states. [2020-08-18 10:38:54,204 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 10:38:54,205 INFO L93 Difference]: Finished difference Result 82 states and 88 transitions. [2020-08-18 10:38:54,205 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-18 10:38:54,205 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 52 [2020-08-18 10:38:54,206 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 10:38:54,206 INFO L225 Difference]: With dead ends: 82 [2020-08-18 10:38:54,206 INFO L226 Difference]: Without dead ends: 60 [2020-08-18 10:38:54,208 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=166, Invalid=296, Unknown=0, NotChecked=0, Total=462 [2020-08-18 10:38:54,208 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-08-18 10:38:54,212 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 59. [2020-08-18 10:38:54,212 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-08-18 10:38:54,212 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 62 transitions. [2020-08-18 10:38:54,213 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 62 transitions. Word has length 52 [2020-08-18 10:38:54,213 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 10:38:54,213 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 62 transitions. [2020-08-18 10:38:54,213 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-18 10:38:54,213 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 62 transitions. [2020-08-18 10:38:54,214 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-18 10:38:54,214 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 10:38:54,214 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 10:38:54,214 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-18 10:38:54,214 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 10:38:54,215 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 10:38:54,215 INFO L82 PathProgramCache]: Analyzing trace with hash 1111589284, now seen corresponding path program 6 times [2020-08-18 10:38:54,215 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 10:38:54,215 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1921874818] [2020-08-18 10:38:54,216 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 10:38:54,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:38:54,253 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 10:38:54,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:38:54,263 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 10:38:54,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:38:54,856 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 10:38:54,857 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1921874818] [2020-08-18 10:38:54,857 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 10:38:54,857 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-18 10:38:54,858 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1470616562] [2020-08-18 10:38:54,858 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-18 10:38:54,858 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 10:38:54,858 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-18 10:38:54,859 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=142, Invalid=238, Unknown=0, NotChecked=0, Total=380 [2020-08-18 10:38:54,859 INFO L87 Difference]: Start difference. First operand 59 states and 62 transitions. Second operand 20 states. [2020-08-18 10:38:55,146 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 10:38:55,146 INFO L93 Difference]: Finished difference Result 84 states and 90 transitions. [2020-08-18 10:38:55,147 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-18 10:38:55,147 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 54 [2020-08-18 10:38:55,147 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 10:38:55,148 INFO L225 Difference]: With dead ends: 84 [2020-08-18 10:38:55,148 INFO L226 Difference]: Without dead ends: 62 [2020-08-18 10:38:55,149 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 10:38:55,149 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-08-18 10:38:55,152 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2020-08-18 10:38:55,153 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-08-18 10:38:55,156 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 64 transitions. [2020-08-18 10:38:55,160 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 64 transitions. Word has length 54 [2020-08-18 10:38:55,161 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 10:38:55,161 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 64 transitions. [2020-08-18 10:38:55,161 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-18 10:38:55,161 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 64 transitions. [2020-08-18 10:38:55,162 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-18 10:38:55,162 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 10:38:55,162 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 10:38:55,163 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-18 10:38:55,163 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 10:38:55,163 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 10:38:55,164 INFO L82 PathProgramCache]: Analyzing trace with hash 1247198438, now seen corresponding path program 7 times [2020-08-18 10:38:55,164 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 10:38:55,164 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [34360891] [2020-08-18 10:38:55,164 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 10:38:55,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:38:55,226 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 10:38:55,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:38:55,240 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 10:38:55,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:38:55,949 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 10:38:55,950 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [34360891] [2020-08-18 10:38:55,950 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 10:38:55,950 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-18 10:38:55,950 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2036242851] [2020-08-18 10:38:55,951 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-18 10:38:55,951 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 10:38:55,951 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-18 10:38:55,952 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=159, Invalid=261, Unknown=0, NotChecked=0, Total=420 [2020-08-18 10:38:55,952 INFO L87 Difference]: Start difference. First operand 61 states and 64 transitions. Second operand 21 states. [2020-08-18 10:38:56,186 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 10:38:56,186 INFO L93 Difference]: Finished difference Result 86 states and 92 transitions. [2020-08-18 10:38:56,187 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-18 10:38:56,187 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 56 [2020-08-18 10:38:56,187 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 10:38:56,188 INFO L225 Difference]: With dead ends: 86 [2020-08-18 10:38:56,188 INFO L226 Difference]: Without dead ends: 64 [2020-08-18 10:38:56,189 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 10:38:56,189 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-08-18 10:38:56,192 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2020-08-18 10:38:56,192 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2020-08-18 10:38:56,193 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 66 transitions. [2020-08-18 10:38:56,193 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 66 transitions. Word has length 56 [2020-08-18 10:38:56,193 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 10:38:56,194 INFO L479 AbstractCegarLoop]: Abstraction has 63 states and 66 transitions. [2020-08-18 10:38:56,194 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-18 10:38:56,194 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 66 transitions. [2020-08-18 10:38:56,194 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-08-18 10:38:56,194 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 10:38:56,195 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 10:38:56,195 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-18 10:38:56,195 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 10:38:56,195 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 10:38:56,195 INFO L82 PathProgramCache]: Analyzing trace with hash -1576390744, now seen corresponding path program 8 times [2020-08-18 10:38:56,196 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 10:38:56,196 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1734382736] [2020-08-18 10:38:56,196 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 10:38:56,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:38:56,238 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 10:38:56,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:38:56,249 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 10:38:56,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:38:56,948 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 10:38:56,948 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1734382736] [2020-08-18 10:38:56,948 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 10:38:56,948 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-18 10:38:56,949 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [133269554] [2020-08-18 10:38:56,949 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-18 10:38:56,949 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 10:38:56,949 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-18 10:38:56,950 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=177, Invalid=285, Unknown=0, NotChecked=0, Total=462 [2020-08-18 10:38:56,950 INFO L87 Difference]: Start difference. First operand 63 states and 66 transitions. Second operand 22 states. [2020-08-18 10:38:57,272 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 10:38:57,273 INFO L93 Difference]: Finished difference Result 88 states and 94 transitions. [2020-08-18 10:38:57,273 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-18 10:38:57,273 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 58 [2020-08-18 10:38:57,274 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 10:38:57,275 INFO L225 Difference]: With dead ends: 88 [2020-08-18 10:38:57,275 INFO L226 Difference]: Without dead ends: 66 [2020-08-18 10:38:57,276 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=223, Invalid=377, Unknown=0, NotChecked=0, Total=600 [2020-08-18 10:38:57,276 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-08-18 10:38:57,279 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2020-08-18 10:38:57,280 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-08-18 10:38:57,280 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 68 transitions. [2020-08-18 10:38:57,281 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 68 transitions. Word has length 58 [2020-08-18 10:38:57,281 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 10:38:57,281 INFO L479 AbstractCegarLoop]: Abstraction has 65 states and 68 transitions. [2020-08-18 10:38:57,281 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-18 10:38:57,281 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 68 transitions. [2020-08-18 10:38:57,282 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2020-08-18 10:38:57,282 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 10:38:57,282 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 10:38:57,282 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-18 10:38:57,282 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 10:38:57,282 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 10:38:57,283 INFO L82 PathProgramCache]: Analyzing trace with hash -626263574, now seen corresponding path program 9 times [2020-08-18 10:38:57,283 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 10:38:57,283 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [352206727] [2020-08-18 10:38:57,283 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 10:38:57,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:38:57,327 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 10:38:57,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:38:57,339 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 10:38:57,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:38:58,122 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 10:38:58,123 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [352206727] [2020-08-18 10:38:58,123 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 10:38:58,123 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-18 10:38:58,123 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [491729002] [2020-08-18 10:38:58,124 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-18 10:38:58,124 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 10:38:58,124 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-18 10:38:58,124 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=196, Invalid=310, Unknown=0, NotChecked=0, Total=506 [2020-08-18 10:38:58,125 INFO L87 Difference]: Start difference. First operand 65 states and 68 transitions. Second operand 23 states. [2020-08-18 10:38:58,433 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 10:38:58,433 INFO L93 Difference]: Finished difference Result 90 states and 96 transitions. [2020-08-18 10:38:58,436 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-18 10:38:58,436 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 60 [2020-08-18 10:38:58,436 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 10:38:58,437 INFO L225 Difference]: With dead ends: 90 [2020-08-18 10:38:58,437 INFO L226 Difference]: Without dead ends: 68 [2020-08-18 10:38:58,438 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=244, Invalid=406, Unknown=0, NotChecked=0, Total=650 [2020-08-18 10:38:58,439 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-08-18 10:38:58,442 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 67. [2020-08-18 10:38:58,442 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-08-18 10:38:58,442 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 70 transitions. [2020-08-18 10:38:58,443 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 70 transitions. Word has length 60 [2020-08-18 10:38:58,443 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 10:38:58,443 INFO L479 AbstractCegarLoop]: Abstraction has 67 states and 70 transitions. [2020-08-18 10:38:58,443 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-18 10:38:58,443 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 70 transitions. [2020-08-18 10:38:58,444 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2020-08-18 10:38:58,444 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 10:38:58,444 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 10:38:58,444 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-18 10:38:58,444 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 10:38:58,444 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 10:38:58,445 INFO L82 PathProgramCache]: Analyzing trace with hash 1912880044, now seen corresponding path program 10 times [2020-08-18 10:38:58,445 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 10:38:58,445 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1250556034] [2020-08-18 10:38:58,445 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 10:38:58,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:38:58,488 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 10:38:58,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:38:58,499 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 10:38:58,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:38:59,467 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 10:38:59,472 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1250556034] [2020-08-18 10:38:59,473 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 10:38:59,473 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-18 10:38:59,473 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1817152917] [2020-08-18 10:38:59,474 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-18 10:38:59,475 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 10:38:59,475 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-18 10:38:59,478 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=216, Invalid=336, Unknown=0, NotChecked=0, Total=552 [2020-08-18 10:38:59,478 INFO L87 Difference]: Start difference. First operand 67 states and 70 transitions. Second operand 24 states. [2020-08-18 10:38:59,821 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 10:38:59,821 INFO L93 Difference]: Finished difference Result 92 states and 98 transitions. [2020-08-18 10:38:59,822 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-18 10:38:59,822 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 62 [2020-08-18 10:38:59,823 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 10:38:59,823 INFO L225 Difference]: With dead ends: 92 [2020-08-18 10:38:59,824 INFO L226 Difference]: Without dead ends: 70 [2020-08-18 10:38:59,824 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=266, Invalid=436, Unknown=0, NotChecked=0, Total=702 [2020-08-18 10:38:59,825 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-08-18 10:38:59,829 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 69. [2020-08-18 10:38:59,830 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2020-08-18 10:38:59,830 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 72 transitions. [2020-08-18 10:38:59,831 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 72 transitions. Word has length 62 [2020-08-18 10:38:59,831 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 10:38:59,831 INFO L479 AbstractCegarLoop]: Abstraction has 69 states and 72 transitions. [2020-08-18 10:38:59,831 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-18 10:38:59,832 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 72 transitions. [2020-08-18 10:38:59,832 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2020-08-18 10:38:59,833 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 10:38:59,833 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 10:38:59,833 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-18 10:38:59,833 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 10:38:59,834 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 10:38:59,834 INFO L82 PathProgramCache]: Analyzing trace with hash -1806494482, now seen corresponding path program 11 times [2020-08-18 10:38:59,834 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 10:38:59,834 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1838967272] [2020-08-18 10:38:59,835 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 10:38:59,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:38:59,894 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 10:38:59,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:38:59,909 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 10:38:59,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:39:00,874 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 10:39:00,874 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1838967272] [2020-08-18 10:39:00,874 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 10:39:00,875 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-18 10:39:00,875 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1311013637] [2020-08-18 10:39:00,875 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-18 10:39:00,875 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 10:39:00,876 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-18 10:39:00,876 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=237, Invalid=363, Unknown=0, NotChecked=0, Total=600 [2020-08-18 10:39:00,876 INFO L87 Difference]: Start difference. First operand 69 states and 72 transitions. Second operand 25 states. [2020-08-18 10:39:01,246 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 10:39:01,246 INFO L93 Difference]: Finished difference Result 94 states and 100 transitions. [2020-08-18 10:39:01,247 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-18 10:39:01,247 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 64 [2020-08-18 10:39:01,247 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 10:39:01,248 INFO L225 Difference]: With dead ends: 94 [2020-08-18 10:39:01,248 INFO L226 Difference]: Without dead ends: 72 [2020-08-18 10:39:01,249 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=289, Invalid=467, Unknown=0, NotChecked=0, Total=756 [2020-08-18 10:39:01,249 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-08-18 10:39:01,257 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 71. [2020-08-18 10:39:01,258 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-08-18 10:39:01,258 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 74 transitions. [2020-08-18 10:39:01,259 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 74 transitions. Word has length 64 [2020-08-18 10:39:01,259 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 10:39:01,259 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 74 transitions. [2020-08-18 10:39:01,259 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-18 10:39:01,259 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 74 transitions. [2020-08-18 10:39:01,260 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2020-08-18 10:39:01,260 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 10:39:01,260 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 10:39:01,263 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-18 10:39:01,264 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 10:39:01,264 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 10:39:01,264 INFO L82 PathProgramCache]: Analyzing trace with hash 1582343600, now seen corresponding path program 12 times [2020-08-18 10:39:01,264 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 10:39:01,265 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [632083857] [2020-08-18 10:39:01,265 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 10:39:01,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:39:01,337 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 10:39:01,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:39:01,351 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 10:39:01,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:39:02,328 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 10:39:02,328 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [632083857] [2020-08-18 10:39:02,328 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 10:39:02,328 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-18 10:39:02,329 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [854311083] [2020-08-18 10:39:02,329 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-18 10:39:02,329 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 10:39:02,329 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-18 10:39:02,330 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=259, Invalid=391, Unknown=0, NotChecked=0, Total=650 [2020-08-18 10:39:02,330 INFO L87 Difference]: Start difference. First operand 71 states and 74 transitions. Second operand 26 states. [2020-08-18 10:39:02,685 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 10:39:02,685 INFO L93 Difference]: Finished difference Result 96 states and 102 transitions. [2020-08-18 10:39:02,686 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-18 10:39:02,686 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 66 [2020-08-18 10:39:02,686 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 10:39:02,687 INFO L225 Difference]: With dead ends: 96 [2020-08-18 10:39:02,687 INFO L226 Difference]: Without dead ends: 74 [2020-08-18 10:39:02,688 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=313, Invalid=499, Unknown=0, NotChecked=0, Total=812 [2020-08-18 10:39:02,688 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2020-08-18 10:39:02,692 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 73. [2020-08-18 10:39:02,692 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-08-18 10:39:02,692 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 76 transitions. [2020-08-18 10:39:02,692 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 76 transitions. Word has length 66 [2020-08-18 10:39:02,693 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 10:39:02,693 INFO L479 AbstractCegarLoop]: Abstraction has 73 states and 76 transitions. [2020-08-18 10:39:02,693 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-18 10:39:02,693 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 76 transitions. [2020-08-18 10:39:02,693 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-08-18 10:39:02,694 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 10:39:02,694 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 10:39:02,694 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-18 10:39:02,695 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 10:39:02,695 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 10:39:02,695 INFO L82 PathProgramCache]: Analyzing trace with hash -1624437262, now seen corresponding path program 13 times [2020-08-18 10:39:02,695 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 10:39:02,696 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [8893348] [2020-08-18 10:39:02,696 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 10:39:02,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:39:02,743 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 10:39:02,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:39:02,754 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 10:39:02,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:39:03,996 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 10:39:03,997 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [8893348] [2020-08-18 10:39:03,997 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 10:39:03,997 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-18 10:39:03,997 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [452674972] [2020-08-18 10:39:03,999 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-18 10:39:03,999 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 10:39:04,000 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-18 10:39:04,001 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=282, Invalid=420, Unknown=0, NotChecked=0, Total=702 [2020-08-18 10:39:04,001 INFO L87 Difference]: Start difference. First operand 73 states and 76 transitions. Second operand 27 states. [2020-08-18 10:39:04,194 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 10:39:04,194 INFO L93 Difference]: Finished difference Result 98 states and 104 transitions. [2020-08-18 10:39:04,196 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-18 10:39:04,196 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 68 [2020-08-18 10:39:04,196 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 10:39:04,197 INFO L225 Difference]: With dead ends: 98 [2020-08-18 10:39:04,197 INFO L226 Difference]: Without dead ends: 76 [2020-08-18 10:39:04,198 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=338, Invalid=532, Unknown=0, NotChecked=0, Total=870 [2020-08-18 10:39:04,199 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-08-18 10:39:04,202 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 75. [2020-08-18 10:39:04,202 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2020-08-18 10:39:04,203 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 78 transitions. [2020-08-18 10:39:04,203 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 78 transitions. Word has length 68 [2020-08-18 10:39:04,203 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 10:39:04,203 INFO L479 AbstractCegarLoop]: Abstraction has 75 states and 78 transitions. [2020-08-18 10:39:04,204 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-18 10:39:04,204 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 78 transitions. [2020-08-18 10:39:04,204 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2020-08-18 10:39:04,204 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 10:39:04,204 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 10:39:04,205 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-18 10:39:04,205 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 10:39:04,205 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 10:39:04,205 INFO L82 PathProgramCache]: Analyzing trace with hash 445672884, now seen corresponding path program 14 times [2020-08-18 10:39:04,205 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 10:39:04,205 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [67857443] [2020-08-18 10:39:04,206 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 10:39:04,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:39:04,255 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 10:39:04,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:39:04,265 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 10:39:04,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:39:05,380 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 10:39:05,380 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [67857443] [2020-08-18 10:39:05,380 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 10:39:05,380 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-18 10:39:05,380 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1204318647] [2020-08-18 10:39:05,382 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-18 10:39:05,382 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 10:39:05,382 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-18 10:39:05,383 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=306, Invalid=450, Unknown=0, NotChecked=0, Total=756 [2020-08-18 10:39:05,383 INFO L87 Difference]: Start difference. First operand 75 states and 78 transitions. Second operand 28 states. [2020-08-18 10:39:05,723 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 10:39:05,723 INFO L93 Difference]: Finished difference Result 100 states and 106 transitions. [2020-08-18 10:39:05,724 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-18 10:39:05,724 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 70 [2020-08-18 10:39:05,724 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 10:39:05,725 INFO L225 Difference]: With dead ends: 100 [2020-08-18 10:39:05,725 INFO L226 Difference]: Without dead ends: 78 [2020-08-18 10:39:05,727 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 10:39:05,727 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-08-18 10:39:05,730 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 77. [2020-08-18 10:39:05,731 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2020-08-18 10:39:05,731 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 80 transitions. [2020-08-18 10:39:05,731 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 80 transitions. Word has length 70 [2020-08-18 10:39:05,732 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 10:39:05,732 INFO L479 AbstractCegarLoop]: Abstraction has 77 states and 80 transitions. [2020-08-18 10:39:05,732 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-18 10:39:05,732 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 80 transitions. [2020-08-18 10:39:05,732 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2020-08-18 10:39:05,733 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 10:39:05,733 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 10:39:05,733 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-18 10:39:05,733 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 10:39:05,733 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 10:39:05,734 INFO L82 PathProgramCache]: Analyzing trace with hash 1251665142, now seen corresponding path program 15 times [2020-08-18 10:39:05,734 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 10:39:05,734 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1709222652] [2020-08-18 10:39:05,734 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 10:39:05,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:39:05,785 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 10:39:05,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:39:05,795 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 10:39:05,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:39:07,042 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 10:39:07,043 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1709222652] [2020-08-18 10:39:07,043 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 10:39:07,043 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-18 10:39:07,044 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [694320040] [2020-08-18 10:39:07,044 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-18 10:39:07,044 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 10:39:07,044 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-18 10:39:07,045 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=331, Invalid=481, Unknown=0, NotChecked=0, Total=812 [2020-08-18 10:39:07,045 INFO L87 Difference]: Start difference. First operand 77 states and 80 transitions. Second operand 29 states. [2020-08-18 10:39:07,403 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 10:39:07,403 INFO L93 Difference]: Finished difference Result 102 states and 108 transitions. [2020-08-18 10:39:07,404 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-18 10:39:07,404 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 72 [2020-08-18 10:39:07,404 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 10:39:07,405 INFO L225 Difference]: With dead ends: 102 [2020-08-18 10:39:07,405 INFO L226 Difference]: Without dead ends: 80 [2020-08-18 10:39:07,406 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=391, Invalid=601, Unknown=0, NotChecked=0, Total=992 [2020-08-18 10:39:07,407 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-08-18 10:39:07,410 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 79. [2020-08-18 10:39:07,411 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-08-18 10:39:07,411 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 82 transitions. [2020-08-18 10:39:07,412 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 82 transitions. Word has length 72 [2020-08-18 10:39:07,412 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 10:39:07,412 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 82 transitions. [2020-08-18 10:39:07,412 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-18 10:39:07,412 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 82 transitions. [2020-08-18 10:39:07,413 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2020-08-18 10:39:07,413 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 10:39:07,413 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 10:39:07,413 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-18 10:39:07,413 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 10:39:07,413 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 10:39:07,414 INFO L82 PathProgramCache]: Analyzing trace with hash -1578855496, now seen corresponding path program 16 times [2020-08-18 10:39:07,414 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 10:39:07,414 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [711173457] [2020-08-18 10:39:07,414 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 10:39:07,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:39:07,464 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 10:39:07,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:39:07,476 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 10:39:07,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:39:08,715 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 10:39:08,715 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [711173457] [2020-08-18 10:39:08,716 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 10:39:08,716 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-18 10:39:08,716 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1354899032] [2020-08-18 10:39:08,716 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-18 10:39:08,716 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 10:39:08,717 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-18 10:39:08,717 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=357, Invalid=513, Unknown=0, NotChecked=0, Total=870 [2020-08-18 10:39:08,717 INFO L87 Difference]: Start difference. First operand 79 states and 82 transitions. Second operand 30 states. [2020-08-18 10:39:09,022 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 10:39:09,022 INFO L93 Difference]: Finished difference Result 104 states and 110 transitions. [2020-08-18 10:39:09,023 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-18 10:39:09,023 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 74 [2020-08-18 10:39:09,024 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 10:39:09,024 INFO L225 Difference]: With dead ends: 104 [2020-08-18 10:39:09,025 INFO L226 Difference]: Without dead ends: 82 [2020-08-18 10:39:09,025 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=419, Invalid=637, Unknown=0, NotChecked=0, Total=1056 [2020-08-18 10:39:09,026 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-08-18 10:39:09,029 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 81. [2020-08-18 10:39:09,029 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2020-08-18 10:39:09,029 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 84 transitions. [2020-08-18 10:39:09,030 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 84 transitions. Word has length 74 [2020-08-18 10:39:09,030 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 10:39:09,030 INFO L479 AbstractCegarLoop]: Abstraction has 81 states and 84 transitions. [2020-08-18 10:39:09,030 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-18 10:39:09,030 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 84 transitions. [2020-08-18 10:39:09,031 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2020-08-18 10:39:09,031 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 10:39:09,031 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 10:39:09,031 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-18 10:39:09,031 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 10:39:09,032 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 10:39:09,032 INFO L82 PathProgramCache]: Analyzing trace with hash 1300077050, now seen corresponding path program 17 times [2020-08-18 10:39:09,032 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 10:39:09,032 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [997302605] [2020-08-18 10:39:09,032 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 10:39:09,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:39:09,083 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 10:39:09,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:39:09,094 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 10:39:09,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:39:10,387 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 10:39:10,387 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [997302605] [2020-08-18 10:39:10,387 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 10:39:10,388 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-18 10:39:10,388 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [665335054] [2020-08-18 10:39:10,388 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-18 10:39:10,388 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 10:39:10,388 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-18 10:39:10,389 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=384, Invalid=546, Unknown=0, NotChecked=0, Total=930 [2020-08-18 10:39:10,389 INFO L87 Difference]: Start difference. First operand 81 states and 84 transitions. Second operand 31 states. [2020-08-18 10:39:10,815 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 10:39:10,815 INFO L93 Difference]: Finished difference Result 106 states and 112 transitions. [2020-08-18 10:39:10,816 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-18 10:39:10,816 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 76 [2020-08-18 10:39:10,816 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 10:39:10,817 INFO L225 Difference]: With dead ends: 106 [2020-08-18 10:39:10,817 INFO L226 Difference]: Without dead ends: 84 [2020-08-18 10:39:10,818 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=448, Invalid=674, Unknown=0, NotChecked=0, Total=1122 [2020-08-18 10:39:10,818 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2020-08-18 10:39:10,821 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 83. [2020-08-18 10:39:10,821 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2020-08-18 10:39:10,822 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 86 transitions. [2020-08-18 10:39:10,822 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 86 transitions. Word has length 76 [2020-08-18 10:39:10,822 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 10:39:10,823 INFO L479 AbstractCegarLoop]: Abstraction has 83 states and 86 transitions. [2020-08-18 10:39:10,823 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-18 10:39:10,823 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 86 transitions. [2020-08-18 10:39:10,823 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-08-18 10:39:10,823 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 10:39:10,824 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 10:39:10,824 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-18 10:39:10,824 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 10:39:10,824 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 10:39:10,824 INFO L82 PathProgramCache]: Analyzing trace with hash 1995315132, now seen corresponding path program 18 times [2020-08-18 10:39:10,825 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 10:39:10,825 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1011061431] [2020-08-18 10:39:10,825 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 10:39:10,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:39:10,875 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 10:39:10,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:39:10,884 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 10:39:10,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:39:12,292 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 10:39:12,293 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1011061431] [2020-08-18 10:39:12,293 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 10:39:12,293 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-18 10:39:12,293 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1636706065] [2020-08-18 10:39:12,294 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-18 10:39:12,294 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 10:39:12,294 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-18 10:39:12,294 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=412, Invalid=580, Unknown=0, NotChecked=0, Total=992 [2020-08-18 10:39:12,294 INFO L87 Difference]: Start difference. First operand 83 states and 86 transitions. Second operand 32 states. [2020-08-18 10:39:12,698 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 10:39:12,698 INFO L93 Difference]: Finished difference Result 108 states and 114 transitions. [2020-08-18 10:39:12,699 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-18 10:39:12,699 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 78 [2020-08-18 10:39:12,699 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 10:39:12,700 INFO L225 Difference]: With dead ends: 108 [2020-08-18 10:39:12,700 INFO L226 Difference]: Without dead ends: 86 [2020-08-18 10:39:12,702 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 10:39:12,702 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2020-08-18 10:39:12,705 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 85. [2020-08-18 10:39:12,705 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2020-08-18 10:39:12,706 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 88 transitions. [2020-08-18 10:39:12,706 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 88 transitions. Word has length 78 [2020-08-18 10:39:12,707 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 10:39:12,707 INFO L479 AbstractCegarLoop]: Abstraction has 85 states and 88 transitions. [2020-08-18 10:39:12,707 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-18 10:39:12,707 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 88 transitions. [2020-08-18 10:39:12,707 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2020-08-18 10:39:12,708 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 10:39:12,708 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 10:39:12,708 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-18 10:39:12,708 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 10:39:12,708 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 10:39:12,708 INFO L82 PathProgramCache]: Analyzing trace with hash 104213758, now seen corresponding path program 19 times [2020-08-18 10:39:12,709 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 10:39:12,709 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1767467144] [2020-08-18 10:39:12,709 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 10:39:12,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:39:12,757 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 10:39:12,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:39:12,781 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 10:39:12,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:39:14,301 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 10:39:14,302 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1767467144] [2020-08-18 10:39:14,303 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 10:39:14,303 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-18 10:39:14,303 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1037535545] [2020-08-18 10:39:14,303 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-18 10:39:14,303 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 10:39:14,304 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-18 10:39:14,304 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=441, Invalid=615, Unknown=0, NotChecked=0, Total=1056 [2020-08-18 10:39:14,304 INFO L87 Difference]: Start difference. First operand 85 states and 88 transitions. Second operand 33 states. [2020-08-18 10:39:14,715 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 10:39:14,716 INFO L93 Difference]: Finished difference Result 110 states and 116 transitions. [2020-08-18 10:39:14,716 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-18 10:39:14,716 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 80 [2020-08-18 10:39:14,717 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 10:39:14,717 INFO L225 Difference]: With dead ends: 110 [2020-08-18 10:39:14,718 INFO L226 Difference]: Without dead ends: 88 [2020-08-18 10:39:14,719 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=509, Invalid=751, Unknown=0, NotChecked=0, Total=1260 [2020-08-18 10:39:14,719 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-08-18 10:39:14,723 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 87. [2020-08-18 10:39:14,723 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2020-08-18 10:39:14,724 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 90 transitions. [2020-08-18 10:39:14,724 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 90 transitions. Word has length 80 [2020-08-18 10:39:14,724 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 10:39:14,724 INFO L479 AbstractCegarLoop]: Abstraction has 87 states and 90 transitions. [2020-08-18 10:39:14,724 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-18 10:39:14,724 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 90 transitions. [2020-08-18 10:39:14,725 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2020-08-18 10:39:14,725 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 10:39:14,725 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 10:39:14,725 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-18 10:39:14,726 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 10:39:14,726 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 10:39:14,726 INFO L82 PathProgramCache]: Analyzing trace with hash -473040448, now seen corresponding path program 20 times [2020-08-18 10:39:14,726 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 10:39:14,726 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1531026433] [2020-08-18 10:39:14,726 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 10:39:14,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:39:14,780 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 10:39:14,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:39:14,790 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 10:39:14,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:39:16,439 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 10:39:16,439 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1531026433] [2020-08-18 10:39:16,440 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 10:39:16,440 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-18 10:39:16,440 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1983634227] [2020-08-18 10:39:16,440 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-18 10:39:16,440 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 10:39:16,441 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-18 10:39:16,441 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=471, Invalid=651, Unknown=0, NotChecked=0, Total=1122 [2020-08-18 10:39:16,441 INFO L87 Difference]: Start difference. First operand 87 states and 90 transitions. Second operand 34 states. [2020-08-18 10:39:16,907 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 10:39:16,907 INFO L93 Difference]: Finished difference Result 112 states and 118 transitions. [2020-08-18 10:39:16,908 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-18 10:39:16,908 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 82 [2020-08-18 10:39:16,908 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 10:39:16,909 INFO L225 Difference]: With dead ends: 112 [2020-08-18 10:39:16,909 INFO L226 Difference]: Without dead ends: 90 [2020-08-18 10:39:16,910 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 10:39:16,911 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2020-08-18 10:39:16,914 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 89. [2020-08-18 10:39:16,914 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2020-08-18 10:39:16,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 92 transitions. [2020-08-18 10:39:16,915 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 92 transitions. Word has length 82 [2020-08-18 10:39:16,915 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 10:39:16,915 INFO L479 AbstractCegarLoop]: Abstraction has 89 states and 92 transitions. [2020-08-18 10:39:16,916 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-18 10:39:16,916 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 92 transitions. [2020-08-18 10:39:16,916 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2020-08-18 10:39:16,916 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 10:39:16,916 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 10:39:16,916 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-18 10:39:16,917 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 10:39:16,917 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 10:39:16,917 INFO L82 PathProgramCache]: Analyzing trace with hash -1163551230, now seen corresponding path program 21 times [2020-08-18 10:39:16,917 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 10:39:16,917 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [352718059] [2020-08-18 10:39:16,917 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 10:39:16,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:39:16,965 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 10:39:16,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:39:16,986 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 10:39:17,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:39:18,660 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 10:39:18,660 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [352718059] [2020-08-18 10:39:18,660 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 10:39:18,660 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-18 10:39:18,661 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [392969001] [2020-08-18 10:39:18,661 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-18 10:39:18,661 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 10:39:18,661 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-18 10:39:18,662 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=502, Invalid=688, Unknown=0, NotChecked=0, Total=1190 [2020-08-18 10:39:18,662 INFO L87 Difference]: Start difference. First operand 89 states and 92 transitions. Second operand 35 states. [2020-08-18 10:39:19,166 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 10:39:19,166 INFO L93 Difference]: Finished difference Result 114 states and 120 transitions. [2020-08-18 10:39:19,167 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-18 10:39:19,167 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 84 [2020-08-18 10:39:19,167 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 10:39:19,168 INFO L225 Difference]: With dead ends: 114 [2020-08-18 10:39:19,168 INFO L226 Difference]: Without dead ends: 92 [2020-08-18 10:39:19,169 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=574, Invalid=832, Unknown=0, NotChecked=0, Total=1406 [2020-08-18 10:39:19,170 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2020-08-18 10:39:19,174 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 91. [2020-08-18 10:39:19,174 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2020-08-18 10:39:19,175 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 94 transitions. [2020-08-18 10:39:19,175 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 94 transitions. Word has length 84 [2020-08-18 10:39:19,175 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 10:39:19,175 INFO L479 AbstractCegarLoop]: Abstraction has 91 states and 94 transitions. [2020-08-18 10:39:19,175 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-18 10:39:19,175 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 94 transitions. [2020-08-18 10:39:19,176 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2020-08-18 10:39:19,176 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 10:39:19,176 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 10:39:19,177 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-18 10:39:19,177 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 10:39:19,177 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 10:39:19,177 INFO L82 PathProgramCache]: Analyzing trace with hash 975518148, now seen corresponding path program 22 times [2020-08-18 10:39:19,177 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 10:39:19,177 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [736052054] [2020-08-18 10:39:19,178 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 10:39:19,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:39:19,263 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 10:39:19,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:39:19,273 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 10:39:19,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:39:20,979 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 10:39:20,979 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [736052054] [2020-08-18 10:39:20,979 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 10:39:20,980 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-18 10:39:20,980 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [951117820] [2020-08-18 10:39:20,980 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-18 10:39:20,980 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 10:39:20,981 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-18 10:39:20,981 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=534, Invalid=726, Unknown=0, NotChecked=0, Total=1260 [2020-08-18 10:39:20,981 INFO L87 Difference]: Start difference. First operand 91 states and 94 transitions. Second operand 36 states. [2020-08-18 10:39:21,376 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 10:39:21,376 INFO L93 Difference]: Finished difference Result 116 states and 122 transitions. [2020-08-18 10:39:21,377 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-18 10:39:21,377 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 86 [2020-08-18 10:39:21,377 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 10:39:21,378 INFO L225 Difference]: With dead ends: 116 [2020-08-18 10:39:21,378 INFO L226 Difference]: Without dead ends: 94 [2020-08-18 10:39:21,379 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=608, Invalid=874, Unknown=0, NotChecked=0, Total=1482 [2020-08-18 10:39:21,380 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2020-08-18 10:39:21,384 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 93. [2020-08-18 10:39:21,384 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2020-08-18 10:39:21,385 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 96 transitions. [2020-08-18 10:39:21,385 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 96 transitions. Word has length 86 [2020-08-18 10:39:21,385 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 10:39:21,385 INFO L479 AbstractCegarLoop]: Abstraction has 93 states and 96 transitions. [2020-08-18 10:39:21,386 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-18 10:39:21,386 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 96 transitions. [2020-08-18 10:39:21,386 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2020-08-18 10:39:21,386 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 10:39:21,387 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 10:39:21,387 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-18 10:39:21,387 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 10:39:21,387 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 10:39:21,387 INFO L82 PathProgramCache]: Analyzing trace with hash -668144378, now seen corresponding path program 23 times [2020-08-18 10:39:21,387 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 10:39:21,388 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [173095363] [2020-08-18 10:39:21,388 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 10:39:21,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:39:21,447 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 10:39:21,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:39:21,459 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 10:39:21,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:39:23,279 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 10:39:23,280 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [173095363] [2020-08-18 10:39:23,280 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 10:39:23,280 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-18 10:39:23,280 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [794043340] [2020-08-18 10:39:23,280 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-18 10:39:23,281 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 10:39:23,281 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-18 10:39:23,281 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=567, Invalid=765, Unknown=0, NotChecked=0, Total=1332 [2020-08-18 10:39:23,281 INFO L87 Difference]: Start difference. First operand 93 states and 96 transitions. Second operand 37 states. [2020-08-18 10:39:23,770 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 10:39:23,771 INFO L93 Difference]: Finished difference Result 118 states and 124 transitions. [2020-08-18 10:39:23,771 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-18 10:39:23,771 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 88 [2020-08-18 10:39:23,772 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 10:39:23,773 INFO L225 Difference]: With dead ends: 118 [2020-08-18 10:39:23,773 INFO L226 Difference]: Without dead ends: 96 [2020-08-18 10:39:23,774 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=643, Invalid=917, Unknown=0, NotChecked=0, Total=1560 [2020-08-18 10:39:23,775 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2020-08-18 10:39:23,778 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 95. [2020-08-18 10:39:23,778 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2020-08-18 10:39:23,779 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 98 transitions. [2020-08-18 10:39:23,779 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 98 transitions. Word has length 88 [2020-08-18 10:39:23,779 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 10:39:23,779 INFO L479 AbstractCegarLoop]: Abstraction has 95 states and 98 transitions. [2020-08-18 10:39:23,779 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-18 10:39:23,780 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 98 transitions. [2020-08-18 10:39:23,780 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2020-08-18 10:39:23,780 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 10:39:23,781 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 10:39:23,781 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-18 10:39:23,781 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 10:39:23,781 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 10:39:23,781 INFO L82 PathProgramCache]: Analyzing trace with hash 320133064, now seen corresponding path program 24 times [2020-08-18 10:39:23,781 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 10:39:23,782 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1712133790] [2020-08-18 10:39:23,782 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 10:39:23,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:39:23,843 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 10:39:23,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:39:23,854 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 10:39:23,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:39:25,785 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 10:39:25,786 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1712133790] [2020-08-18 10:39:25,786 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 10:39:25,786 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-18 10:39:25,786 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [438388587] [2020-08-18 10:39:25,787 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-18 10:39:25,787 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 10:39:25,787 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-18 10:39:25,787 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=601, Invalid=805, Unknown=0, NotChecked=0, Total=1406 [2020-08-18 10:39:25,788 INFO L87 Difference]: Start difference. First operand 95 states and 98 transitions. Second operand 38 states. [2020-08-18 10:39:26,220 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 10:39:26,221 INFO L93 Difference]: Finished difference Result 120 states and 126 transitions. [2020-08-18 10:39:26,221 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-18 10:39:26,221 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 90 [2020-08-18 10:39:26,222 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 10:39:26,223 INFO L225 Difference]: With dead ends: 120 [2020-08-18 10:39:26,223 INFO L226 Difference]: Without dead ends: 98 [2020-08-18 10:39:26,224 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=679, Invalid=961, Unknown=0, NotChecked=0, Total=1640 [2020-08-18 10:39:26,224 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-08-18 10:39:26,228 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 97. [2020-08-18 10:39:26,228 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2020-08-18 10:39:26,229 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 100 transitions. [2020-08-18 10:39:26,229 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 100 transitions. Word has length 90 [2020-08-18 10:39:26,229 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 10:39:26,229 INFO L479 AbstractCegarLoop]: Abstraction has 97 states and 100 transitions. [2020-08-18 10:39:26,229 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-18 10:39:26,230 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 100 transitions. [2020-08-18 10:39:26,230 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2020-08-18 10:39:26,230 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 10:39:26,231 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 10:39:26,231 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-18 10:39:26,231 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 10:39:26,231 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 10:39:26,231 INFO L82 PathProgramCache]: Analyzing trace with hash 866982410, now seen corresponding path program 25 times [2020-08-18 10:39:26,232 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 10:39:26,232 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [415736342] [2020-08-18 10:39:26,232 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 10:39:26,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:39:26,295 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 10:39:26,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:39:26,306 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 10:39:26,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:39:28,332 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 10:39:28,332 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [415736342] [2020-08-18 10:39:28,332 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 10:39:28,332 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-18 10:39:28,333 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [903892495] [2020-08-18 10:39:28,333 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-18 10:39:28,333 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 10:39:28,333 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-18 10:39:28,334 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=636, Invalid=846, Unknown=0, NotChecked=0, Total=1482 [2020-08-18 10:39:28,334 INFO L87 Difference]: Start difference. First operand 97 states and 100 transitions. Second operand 39 states. [2020-08-18 10:39:28,672 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 10:39:28,672 INFO L93 Difference]: Finished difference Result 122 states and 128 transitions. [2020-08-18 10:39:28,673 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-18 10:39:28,673 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 92 [2020-08-18 10:39:28,673 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 10:39:28,674 INFO L225 Difference]: With dead ends: 122 [2020-08-18 10:39:28,674 INFO L226 Difference]: Without dead ends: 100 [2020-08-18 10:39:28,675 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=716, Invalid=1006, Unknown=0, NotChecked=0, Total=1722 [2020-08-18 10:39:28,676 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2020-08-18 10:39:28,679 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 99. [2020-08-18 10:39:28,679 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2020-08-18 10:39:28,679 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 102 transitions. [2020-08-18 10:39:28,679 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 102 transitions. Word has length 92 [2020-08-18 10:39:28,680 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 10:39:28,680 INFO L479 AbstractCegarLoop]: Abstraction has 99 states and 102 transitions. [2020-08-18 10:39:28,680 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-18 10:39:28,680 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 102 transitions. [2020-08-18 10:39:28,680 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2020-08-18 10:39:28,681 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 10:39:28,681 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 10:39:28,681 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-18 10:39:28,681 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 10:39:28,681 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 10:39:28,681 INFO L82 PathProgramCache]: Analyzing trace with hash -1891773492, now seen corresponding path program 26 times [2020-08-18 10:39:28,682 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 10:39:28,682 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1044262913] [2020-08-18 10:39:28,682 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 10:39:28,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:39:28,742 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 10:39:28,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:39:28,753 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 10:39:28,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:39:30,776 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 10:39:30,777 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1044262913] [2020-08-18 10:39:30,777 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 10:39:30,777 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-18 10:39:30,777 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1068041829] [2020-08-18 10:39:30,778 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-18 10:39:30,778 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 10:39:30,778 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-18 10:39:30,779 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=672, Invalid=888, Unknown=0, NotChecked=0, Total=1560 [2020-08-18 10:39:30,779 INFO L87 Difference]: Start difference. First operand 99 states and 102 transitions. Second operand 40 states. [2020-08-18 10:39:31,105 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 10:39:31,106 INFO L93 Difference]: Finished difference Result 124 states and 130 transitions. [2020-08-18 10:39:31,106 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-18 10:39:31,106 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 94 [2020-08-18 10:39:31,107 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 10:39:31,107 INFO L225 Difference]: With dead ends: 124 [2020-08-18 10:39:31,108 INFO L226 Difference]: Without dead ends: 102 [2020-08-18 10:39:31,109 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=754, Invalid=1052, Unknown=0, NotChecked=0, Total=1806 [2020-08-18 10:39:31,109 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2020-08-18 10:39:31,112 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 101. [2020-08-18 10:39:31,112 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2020-08-18 10:39:31,113 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 104 transitions. [2020-08-18 10:39:31,113 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 104 transitions. Word has length 94 [2020-08-18 10:39:31,113 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 10:39:31,114 INFO L479 AbstractCegarLoop]: Abstraction has 101 states and 104 transitions. [2020-08-18 10:39:31,114 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-18 10:39:31,114 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 104 transitions. [2020-08-18 10:39:31,114 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-08-18 10:39:31,114 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 10:39:31,115 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 10:39:31,115 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-18 10:39:31,115 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 10:39:31,115 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 10:39:31,115 INFO L82 PathProgramCache]: Analyzing trace with hash 1233593614, now seen corresponding path program 27 times [2020-08-18 10:39:31,115 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 10:39:31,116 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2004892] [2020-08-18 10:39:31,116 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 10:39:31,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:39:31,182 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 10:39:31,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:39:31,193 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 10:39:31,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:39:33,337 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 10:39:33,338 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2004892] [2020-08-18 10:39:33,338 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 10:39:33,338 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-18 10:39:33,338 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1843004977] [2020-08-18 10:39:33,339 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-18 10:39:33,339 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 10:39:33,339 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-18 10:39:33,339 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=709, Invalid=931, Unknown=0, NotChecked=0, Total=1640 [2020-08-18 10:39:33,339 INFO L87 Difference]: Start difference. First operand 101 states and 104 transitions. Second operand 41 states. [2020-08-18 10:39:33,683 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 10:39:33,683 INFO L93 Difference]: Finished difference Result 126 states and 132 transitions. [2020-08-18 10:39:33,684 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-18 10:39:33,684 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 96 [2020-08-18 10:39:33,684 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 10:39:33,685 INFO L225 Difference]: With dead ends: 126 [2020-08-18 10:39:33,685 INFO L226 Difference]: Without dead ends: 104 [2020-08-18 10:39:33,687 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=793, Invalid=1099, Unknown=0, NotChecked=0, Total=1892 [2020-08-18 10:39:33,687 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2020-08-18 10:39:33,690 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 103. [2020-08-18 10:39:33,690 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2020-08-18 10:39:33,690 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 106 transitions. [2020-08-18 10:39:33,690 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 106 transitions. Word has length 96 [2020-08-18 10:39:33,690 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 10:39:33,691 INFO L479 AbstractCegarLoop]: Abstraction has 103 states and 106 transitions. [2020-08-18 10:39:33,691 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-18 10:39:33,691 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 106 transitions. [2020-08-18 10:39:33,691 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2020-08-18 10:39:33,691 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 10:39:33,691 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 10:39:33,692 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-18 10:39:33,692 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 10:39:33,692 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 10:39:33,692 INFO L82 PathProgramCache]: Analyzing trace with hash -1765724720, now seen corresponding path program 28 times [2020-08-18 10:39:33,692 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 10:39:33,692 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1948372266] [2020-08-18 10:39:33,692 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 10:39:33,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:39:33,753 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 10:39:33,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:39:33,762 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 10:39:33,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:39:35,993 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 10:39:35,994 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1948372266] [2020-08-18 10:39:35,994 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 10:39:35,994 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-18 10:39:35,994 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [814004651] [2020-08-18 10:39:35,994 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-18 10:39:35,994 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 10:39:35,995 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-18 10:39:35,995 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=747, Invalid=975, Unknown=0, NotChecked=0, Total=1722 [2020-08-18 10:39:35,995 INFO L87 Difference]: Start difference. First operand 103 states and 106 transitions. Second operand 42 states. [2020-08-18 10:39:36,444 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 10:39:36,444 INFO L93 Difference]: Finished difference Result 128 states and 134 transitions. [2020-08-18 10:39:36,445 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-18 10:39:36,445 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 98 [2020-08-18 10:39:36,445 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 10:39:36,446 INFO L225 Difference]: With dead ends: 128 [2020-08-18 10:39:36,446 INFO L226 Difference]: Without dead ends: 106 [2020-08-18 10:39:36,447 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=833, Invalid=1147, Unknown=0, NotChecked=0, Total=1980 [2020-08-18 10:39:36,447 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2020-08-18 10:39:36,451 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 105. [2020-08-18 10:39:36,451 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2020-08-18 10:39:36,452 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 108 transitions. [2020-08-18 10:39:36,452 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 108 transitions. Word has length 98 [2020-08-18 10:39:36,452 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 10:39:36,453 INFO L479 AbstractCegarLoop]: Abstraction has 105 states and 108 transitions. [2020-08-18 10:39:36,453 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-18 10:39:36,453 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 108 transitions. [2020-08-18 10:39:36,453 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2020-08-18 10:39:36,453 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 10:39:36,454 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 10:39:36,454 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-18 10:39:36,454 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 10:39:36,454 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 10:39:36,454 INFO L82 PathProgramCache]: Analyzing trace with hash 2107379218, now seen corresponding path program 29 times [2020-08-18 10:39:36,455 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 10:39:36,455 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [319786356] [2020-08-18 10:39:36,455 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 10:39:36,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:39:36,519 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 10:39:36,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:39:36,529 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 10:39:36,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:39:38,899 INFO L134 CoverageAnalysis]: Checked inductivity of 1374 backedges. 0 proven. 1369 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 10:39:38,899 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [319786356] [2020-08-18 10:39:38,899 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 10:39:38,900 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-18 10:39:38,900 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1639847403] [2020-08-18 10:39:38,900 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-18 10:39:38,900 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 10:39:38,901 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-18 10:39:38,901 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=786, Invalid=1020, Unknown=0, NotChecked=0, Total=1806 [2020-08-18 10:39:38,901 INFO L87 Difference]: Start difference. First operand 105 states and 108 transitions. Second operand 43 states. [2020-08-18 10:39:39,465 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 10:39:39,465 INFO L93 Difference]: Finished difference Result 130 states and 136 transitions. [2020-08-18 10:39:39,465 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-08-18 10:39:39,466 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 100 [2020-08-18 10:39:39,466 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 10:39:39,466 INFO L225 Difference]: With dead ends: 130 [2020-08-18 10:39:39,466 INFO L226 Difference]: Without dead ends: 108 [2020-08-18 10:39:39,467 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=874, Invalid=1196, Unknown=0, NotChecked=0, Total=2070 [2020-08-18 10:39:39,468 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-08-18 10:39:39,471 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 107. [2020-08-18 10:39:39,471 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2020-08-18 10:39:39,472 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 110 transitions. [2020-08-18 10:39:39,472 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 110 transitions. Word has length 100 [2020-08-18 10:39:39,472 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 10:39:39,472 INFO L479 AbstractCegarLoop]: Abstraction has 107 states and 110 transitions. [2020-08-18 10:39:39,472 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-18 10:39:39,473 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 110 transitions. [2020-08-18 10:39:39,473 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2020-08-18 10:39:39,473 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 10:39:39,473 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 10:39:39,473 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-08-18 10:39:39,474 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 10:39:39,474 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 10:39:39,474 INFO L82 PathProgramCache]: Analyzing trace with hash 423618004, now seen corresponding path program 30 times [2020-08-18 10:39:39,474 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 10:39:39,474 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [925806319] [2020-08-18 10:39:39,474 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY