/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true -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 11:26:53,874 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-18 11:26:53,877 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-18 11:26:53,906 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-08-18 11:26:53,915 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 11:26:53,916 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 11:26:53,917 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 11:26:53,918 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 11:26:53,919 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 11:26:53,920 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 11:26:53,922 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 11:26:53,924 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 11:26:53,925 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 11:26:53,927 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 11:26:53,928 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 11:26:53,929 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 11:26:53,932 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-18 11:26:53,940 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 11:26:53,941 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 11:26:53,941 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 11:26:53,942 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 11:26:53,965 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 11:26:53,965 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 11:26:53,967 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 11:26:53,967 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 11:26:53,967 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 11:26:53,967 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 11:26:53,968 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 11:26:53,968 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 11:26:53,968 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 11:26:53,968 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 11:26:53,968 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 11:26:53,968 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 11:26:53,969 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 11:26:53,969 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 11:26:53,969 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 11:26:53,969 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 11:26:53,969 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 11:26:53,970 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 11:26:53,970 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 11:26:53,970 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 11:26:53,970 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 11:26:53,970 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 11:26:53,971 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 11:26:53,971 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 11:26:53,971 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 11:26:53,971 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 11:26:53,971 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 11:26:53,972 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 11:26:53,972 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 11:26:53,972 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true [2020-08-18 11:26:54,284 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 11:26:54,303 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 11:26:54,308 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 11:26:54,310 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 11:26:54,310 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 11:26:54,311 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-industry-pattern/array_of_struct_ptr_flag_init.i [2020-08-18 11:26:54,382 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/44ccbe44d/88ffef3ffaab4438b8377390e90976d4/FLAGe22ce9e2a [2020-08-18 11:26:54,810 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 11:26:54,810 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/array-industry-pattern/array_of_struct_ptr_flag_init.i [2020-08-18 11:26:54,819 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/44ccbe44d/88ffef3ffaab4438b8377390e90976d4/FLAGe22ce9e2a [2020-08-18 11:26:55,207 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/44ccbe44d/88ffef3ffaab4438b8377390e90976d4 [2020-08-18 11:26:55,216 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 11:26:55,218 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 11:26:55,219 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 11:26:55,219 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 11:26:55,222 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 11:26:55,225 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 11:26:55" (1/1) ... [2020-08-18 11:26:55,228 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7468b030 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:26:55, skipping insertion in model container [2020-08-18 11:26:55,228 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 11:26:55" (1/1) ... [2020-08-18 11:26:55,236 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 11:26:55,252 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 11:26:55,439 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 11:26:55,445 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 11:26:55,465 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 11:26:55,480 INFO L208 MainTranslator]: Completed translation [2020-08-18 11:26:55,481 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:26:55 WrapperNode [2020-08-18 11:26:55,481 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 11:26:55,482 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 11:26:55,482 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 11:26:55,482 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 11:26:55,572 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:26:55" (1/1) ... [2020-08-18 11:26:55,574 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:26:55" (1/1) ... [2020-08-18 11:26:55,584 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:26:55" (1/1) ... [2020-08-18 11:26:55,585 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:26:55" (1/1) ... [2020-08-18 11:26:55,600 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:26:55" (1/1) ... [2020-08-18 11:26:55,606 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:26:55" (1/1) ... [2020-08-18 11:26:55,607 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:26:55" (1/1) ... [2020-08-18 11:26:55,609 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 11:26:55,610 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 11:26:55,610 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 11:26:55,610 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 11:26:55,611 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:26:55" (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 11:26:55,663 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 11:26:55,663 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 11:26:55,663 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-18 11:26:55,663 INFO L138 BoogieDeclarations]: Found implementation of procedure init [2020-08-18 11:26:55,663 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 11:26:55,664 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2020-08-18 11:26:55,664 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 11:26:55,664 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-18 11:26:55,664 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-08-18 11:26:55,664 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-08-18 11:26:55,664 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-08-18 11:26:55,664 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 11:26:55,665 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-18 11:26:55,665 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-08-18 11:26:55,665 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-18 11:26:55,665 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 11:26:55,665 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 11:26:55,893 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 11:26:55,893 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-08-18 11:26:55,897 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 11:26:55 BoogieIcfgContainer [2020-08-18 11:26:55,898 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 11:26:55,899 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 11:26:55,899 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 11:26:55,902 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 11:26:55,902 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 11:26:55" (1/3) ... [2020-08-18 11:26:55,903 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@27a49b49 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 11:26:55, skipping insertion in model container [2020-08-18 11:26:55,903 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:26:55" (2/3) ... [2020-08-18 11:26:55,904 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@27a49b49 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 11:26:55, skipping insertion in model container [2020-08-18 11:26:55,904 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 11:26:55" (3/3) ... [2020-08-18 11:26:55,906 INFO L109 eAbstractionObserver]: Analyzing ICFG array_of_struct_ptr_flag_init.i [2020-08-18 11:26:55,917 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 11:26:55,926 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-18 11:26:55,943 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-18 11:26:55,971 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 11:26:55,972 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 11:26:55,972 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 11:26:55,972 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 11:26:55,972 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 11:26:55,972 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 11:26:55,973 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 11:26:55,973 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 11:26:55,995 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-08-18 11:26:56,001 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-18 11:26:56,002 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 11:26:56,003 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 11:26:56,003 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 11:26:56,010 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 11:26:56,010 INFO L82 PathProgramCache]: Analyzing trace with hash -850547107, now seen corresponding path program 1 times [2020-08-18 11:26:56,023 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 11:26:56,023 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1129983986] [2020-08-18 11:26:56,024 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 11:26:56,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:26:56,241 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 11:26:56,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:26:56,277 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 11:26:56,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:26:56,296 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 11:26:56,297 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1129983986] [2020-08-18 11:26:56,299 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 11:26:56,299 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 11:26:56,300 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [273663733] [2020-08-18 11:26:56,305 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 11:26:56,305 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 11:26:56,316 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 11:26:56,316 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 11:26:56,319 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 4 states. [2020-08-18 11:26:56,448 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 11:26:56,448 INFO L93 Difference]: Finished difference Result 59 states and 76 transitions. [2020-08-18 11:26:56,449 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-18 11:26:56,450 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 20 [2020-08-18 11:26:56,451 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 11:26:56,461 INFO L225 Difference]: With dead ends: 59 [2020-08-18 11:26:56,461 INFO L226 Difference]: Without dead ends: 31 [2020-08-18 11:26:56,466 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 11:26:56,484 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-18 11:26:56,500 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 28. [2020-08-18 11:26:56,501 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-18 11:26:56,502 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 32 transitions. [2020-08-18 11:26:56,504 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 32 transitions. Word has length 20 [2020-08-18 11:26:56,504 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 11:26:56,504 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 32 transitions. [2020-08-18 11:26:56,505 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 11:26:56,505 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 32 transitions. [2020-08-18 11:26:56,505 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-18 11:26:56,506 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 11:26:56,506 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 11:26:56,506 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 11:26:56,506 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 11:26:56,507 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 11:26:56,507 INFO L82 PathProgramCache]: Analyzing trace with hash 1453375688, now seen corresponding path program 1 times [2020-08-18 11:26:56,507 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 11:26:56,507 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [616039919] [2020-08-18 11:26:56,508 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 11:26:56,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:26:56,572 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 11:26:56,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:26:56,592 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 11:26:56,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:26:56,662 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 11:26:56,662 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [616039919] [2020-08-18 11:26:56,662 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 11:26:56,663 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-08-18 11:26:56,663 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [96309954] [2020-08-18 11:26:56,664 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 11:26:56,665 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 11:26:56,665 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 11:26:56,665 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-08-18 11:26:56,666 INFO L87 Difference]: Start difference. First operand 28 states and 32 transitions. Second operand 6 states. [2020-08-18 11:26:56,845 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 11:26:56,845 INFO L93 Difference]: Finished difference Result 48 states and 56 transitions. [2020-08-18 11:26:56,846 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-18 11:26:56,846 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2020-08-18 11:26:56,847 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 11:26:56,847 INFO L225 Difference]: With dead ends: 48 [2020-08-18 11:26:56,848 INFO L226 Difference]: Without dead ends: 30 [2020-08-18 11:26:56,849 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 11:26:56,850 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-18 11:26:56,867 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2020-08-18 11:26:56,867 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-18 11:26:56,868 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2020-08-18 11:26:56,868 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 20 [2020-08-18 11:26:56,869 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 11:26:56,869 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2020-08-18 11:26:56,869 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 11:26:56,869 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2020-08-18 11:26:56,870 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-18 11:26:56,870 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 11:26:56,870 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 11:26:56,871 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 11:26:56,871 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 11:26:56,871 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 11:26:56,871 INFO L82 PathProgramCache]: Analyzing trace with hash -169907062, now seen corresponding path program 1 times [2020-08-18 11:26:56,872 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 11:26:56,872 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [538927300] [2020-08-18 11:26:56,872 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 11:26:56,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:26:56,920 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 11:26:56,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:26:56,936 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 11:26:56,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:26:57,030 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 11:26:57,031 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [538927300] [2020-08-18 11:26:57,031 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 11:26:57,031 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-18 11:26:57,032 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1234966388] [2020-08-18 11:26:57,032 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-18 11:26:57,033 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 11:26:57,033 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-18 11:26:57,033 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-08-18 11:26:57,033 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand 7 states. [2020-08-18 11:26:57,185 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 11:26:57,185 INFO L93 Difference]: Finished difference Result 50 states and 58 transitions. [2020-08-18 11:26:57,185 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-18 11:26:57,186 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 22 [2020-08-18 11:26:57,186 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 11:26:57,187 INFO L225 Difference]: With dead ends: 50 [2020-08-18 11:26:57,187 INFO L226 Difference]: Without dead ends: 32 [2020-08-18 11:26:57,188 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2020-08-18 11:26:57,188 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-18 11:26:57,193 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2020-08-18 11:26:57,193 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-18 11:26:57,195 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 35 transitions. [2020-08-18 11:26:57,195 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 35 transitions. Word has length 22 [2020-08-18 11:26:57,195 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 11:26:57,195 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 35 transitions. [2020-08-18 11:26:57,195 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-18 11:26:57,196 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 35 transitions. [2020-08-18 11:26:57,196 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-18 11:26:57,196 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 11:26:57,197 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 11:26:57,197 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-18 11:26:57,197 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 11:26:57,197 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 11:26:57,197 INFO L82 PathProgramCache]: Analyzing trace with hash -1071501364, now seen corresponding path program 2 times [2020-08-18 11:26:57,198 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 11:26:57,198 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1185036954] [2020-08-18 11:26:57,198 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 11:26:57,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:26:57,247 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 11:26:57,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:26:57,271 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 11:26:57,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:26:57,417 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 11:26:57,417 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1185036954] [2020-08-18 11:26:57,417 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 11:26:57,418 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-18 11:26:57,418 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1718057798] [2020-08-18 11:26:57,418 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-18 11:26:57,419 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 11:26:57,419 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-18 11:26:57,419 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2020-08-18 11:26:57,420 INFO L87 Difference]: Start difference. First operand 31 states and 35 transitions. Second operand 8 states. [2020-08-18 11:26:57,571 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 11:26:57,571 INFO L93 Difference]: Finished difference Result 52 states and 60 transitions. [2020-08-18 11:26:57,572 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-18 11:26:57,572 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 24 [2020-08-18 11:26:57,572 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 11:26:57,573 INFO L225 Difference]: With dead ends: 52 [2020-08-18 11:26:57,573 INFO L226 Difference]: Without dead ends: 34 [2020-08-18 11:26:57,574 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2020-08-18 11:26:57,574 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-18 11:26:57,578 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2020-08-18 11:26:57,579 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-18 11:26:57,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 37 transitions. [2020-08-18 11:26:57,580 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 37 transitions. Word has length 24 [2020-08-18 11:26:57,580 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 11:26:57,580 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 37 transitions. [2020-08-18 11:26:57,581 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-18 11:26:57,581 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 37 transitions. [2020-08-18 11:26:57,582 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-18 11:26:57,582 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 11:26:57,582 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 11:26:57,582 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-18 11:26:57,583 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 11:26:57,583 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 11:26:57,583 INFO L82 PathProgramCache]: Analyzing trace with hash 79768206, now seen corresponding path program 3 times [2020-08-18 11:26:57,583 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 11:26:57,584 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [551781592] [2020-08-18 11:26:57,584 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 11:26:57,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:26:57,634 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 11:26:57,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:26:57,653 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 11:26:57,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:26:57,820 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 11:26:57,821 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [551781592] [2020-08-18 11:26:57,821 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 11:26:57,822 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-18 11:26:57,822 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [36488641] [2020-08-18 11:26:57,822 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-18 11:26:57,823 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 11:26:57,830 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-18 11:26:57,830 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-18 11:26:57,830 INFO L87 Difference]: Start difference. First operand 33 states and 37 transitions. Second operand 9 states. [2020-08-18 11:26:57,988 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 11:26:57,988 INFO L93 Difference]: Finished difference Result 54 states and 62 transitions. [2020-08-18 11:26:57,988 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-18 11:26:57,988 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-08-18 11:26:57,989 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 11:26:57,989 INFO L225 Difference]: With dead ends: 54 [2020-08-18 11:26:57,990 INFO L226 Difference]: Without dead ends: 36 [2020-08-18 11:26:57,990 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 11:26:57,991 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-18 11:26:57,995 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2020-08-18 11:26:57,995 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-18 11:26:57,996 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2020-08-18 11:26:57,996 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 26 [2020-08-18 11:26:57,997 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 11:26:57,997 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2020-08-18 11:26:57,997 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-18 11:26:57,997 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2020-08-18 11:26:57,998 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-18 11:26:57,998 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 11:26:57,998 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 11:26:57,998 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-18 11:26:57,999 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 11:26:57,999 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 11:26:57,999 INFO L82 PathProgramCache]: Analyzing trace with hash -1651737392, now seen corresponding path program 4 times [2020-08-18 11:26:57,999 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 11:26:58,000 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [265425826] [2020-08-18 11:26:58,000 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 11:26:58,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:26:58,037 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 11:26:58,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:26:58,050 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 11:26:58,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:26:58,221 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 11:26:58,222 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [265425826] [2020-08-18 11:26:58,222 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 11:26:58,222 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-18 11:26:58,223 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [104234287] [2020-08-18 11:26:58,223 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-18 11:26:58,224 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 11:26:58,224 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-18 11:26:58,224 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2020-08-18 11:26:58,224 INFO L87 Difference]: Start difference. First operand 35 states and 39 transitions. Second operand 10 states. [2020-08-18 11:26:58,399 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 11:26:58,400 INFO L93 Difference]: Finished difference Result 56 states and 64 transitions. [2020-08-18 11:26:58,400 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-18 11:26:58,400 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 28 [2020-08-18 11:26:58,401 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 11:26:58,401 INFO L225 Difference]: With dead ends: 56 [2020-08-18 11:26:58,401 INFO L226 Difference]: Without dead ends: 38 [2020-08-18 11:26:58,402 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 11:26:58,402 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-18 11:26:58,407 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2020-08-18 11:26:58,407 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-18 11:26:58,407 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 41 transitions. [2020-08-18 11:26:58,408 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 41 transitions. Word has length 28 [2020-08-18 11:26:58,408 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 11:26:58,408 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 41 transitions. [2020-08-18 11:26:58,408 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-18 11:26:58,408 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 41 transitions. [2020-08-18 11:26:58,409 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-18 11:26:58,409 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 11:26:58,409 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 11:26:58,410 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-18 11:26:58,410 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 11:26:58,410 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 11:26:58,410 INFO L82 PathProgramCache]: Analyzing trace with hash 818693778, now seen corresponding path program 5 times [2020-08-18 11:26:58,411 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 11:26:58,411 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [740990149] [2020-08-18 11:26:58,411 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 11:26:58,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:26:58,442 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 11:26:58,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:26:58,454 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 11:26:58,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:26:58,705 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 11:26:58,705 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [740990149] [2020-08-18 11:26:58,705 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 11:26:58,706 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-18 11:26:58,706 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [191608800] [2020-08-18 11:26:58,706 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-18 11:26:58,706 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 11:26:58,707 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-18 11:26:58,707 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2020-08-18 11:26:58,707 INFO L87 Difference]: Start difference. First operand 37 states and 41 transitions. Second operand 11 states. [2020-08-18 11:26:58,894 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 11:26:58,895 INFO L93 Difference]: Finished difference Result 58 states and 66 transitions. [2020-08-18 11:26:58,895 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-18 11:26:58,895 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 30 [2020-08-18 11:26:58,896 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 11:26:58,896 INFO L225 Difference]: With dead ends: 58 [2020-08-18 11:26:58,896 INFO L226 Difference]: Without dead ends: 40 [2020-08-18 11:26:58,897 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 11:26:58,897 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-18 11:26:58,901 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2020-08-18 11:26:58,902 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-18 11:26:58,902 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 43 transitions. [2020-08-18 11:26:58,903 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 43 transitions. Word has length 30 [2020-08-18 11:26:58,903 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 11:26:58,903 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 43 transitions. [2020-08-18 11:26:58,903 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-18 11:26:58,903 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 43 transitions. [2020-08-18 11:26:58,904 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-18 11:26:58,904 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 11:26:58,904 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 11:26:58,904 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-18 11:26:58,905 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 11:26:58,905 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 11:26:58,905 INFO L82 PathProgramCache]: Analyzing trace with hash -213866540, now seen corresponding path program 6 times [2020-08-18 11:26:58,905 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 11:26:58,906 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [623590786] [2020-08-18 11:26:58,906 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 11:26:58,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:26:58,956 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 11:26:58,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:26:58,969 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 11:26:58,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:26:59,237 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 11:26:59,238 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [623590786] [2020-08-18 11:26:59,238 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 11:26:59,238 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-18 11:26:59,238 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1864774618] [2020-08-18 11:26:59,239 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-18 11:26:59,239 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 11:26:59,239 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-18 11:26:59,240 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=90, Unknown=0, NotChecked=0, Total=132 [2020-08-18 11:26:59,240 INFO L87 Difference]: Start difference. First operand 39 states and 43 transitions. Second operand 12 states. [2020-08-18 11:26:59,428 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 11:26:59,428 INFO L93 Difference]: Finished difference Result 60 states and 68 transitions. [2020-08-18 11:26:59,429 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-18 11:26:59,429 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 32 [2020-08-18 11:26:59,429 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 11:26:59,430 INFO L225 Difference]: With dead ends: 60 [2020-08-18 11:26:59,430 INFO L226 Difference]: Without dead ends: 42 [2020-08-18 11:26:59,431 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 11:26:59,433 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-18 11:26:59,438 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2020-08-18 11:26:59,438 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-18 11:26:59,441 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 45 transitions. [2020-08-18 11:26:59,441 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 45 transitions. Word has length 32 [2020-08-18 11:26:59,444 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 11:26:59,444 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 45 transitions. [2020-08-18 11:26:59,444 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-18 11:26:59,445 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 45 transitions. [2020-08-18 11:26:59,445 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-18 11:26:59,445 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 11:26:59,456 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 11:26:59,456 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-18 11:26:59,456 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 11:26:59,456 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 11:26:59,457 INFO L82 PathProgramCache]: Analyzing trace with hash -366886762, now seen corresponding path program 7 times [2020-08-18 11:26:59,457 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 11:26:59,457 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [838169774] [2020-08-18 11:26:59,457 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 11:26:59,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:26:59,506 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 11:26:59,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:26:59,524 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 11:26:59,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:26:59,818 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 11:26:59,819 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [838169774] [2020-08-18 11:26:59,819 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 11:26:59,819 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-18 11:26:59,822 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1059056011] [2020-08-18 11:26:59,822 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-18 11:26:59,822 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 11:26:59,823 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-18 11:26:59,823 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=105, Unknown=0, NotChecked=0, Total=156 [2020-08-18 11:26:59,823 INFO L87 Difference]: Start difference. First operand 41 states and 45 transitions. Second operand 13 states. [2020-08-18 11:27:00,018 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 11:27:00,018 INFO L93 Difference]: Finished difference Result 62 states and 70 transitions. [2020-08-18 11:27:00,019 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-18 11:27:00,019 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 34 [2020-08-18 11:27:00,019 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 11:27:00,020 INFO L225 Difference]: With dead ends: 62 [2020-08-18 11:27:00,020 INFO L226 Difference]: Without dead ends: 44 [2020-08-18 11:27:00,022 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 11:27:00,023 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-18 11:27:00,026 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2020-08-18 11:27:00,027 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-18 11:27:00,029 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 47 transitions. [2020-08-18 11:27:00,029 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 47 transitions. Word has length 34 [2020-08-18 11:27:00,029 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 11:27:00,029 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 47 transitions. [2020-08-18 11:27:00,030 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-18 11:27:00,030 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 47 transitions. [2020-08-18 11:27:00,030 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-18 11:27:00,031 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 11:27:00,031 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 11:27:00,031 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-18 11:27:00,031 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 11:27:00,031 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 11:27:00,031 INFO L82 PathProgramCache]: Analyzing trace with hash -1390432040, now seen corresponding path program 8 times [2020-08-18 11:27:00,032 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 11:27:00,032 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [939957525] [2020-08-18 11:27:00,032 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 11:27:00,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:00,074 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 11:27:00,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:00,091 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 11:27:00,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:00,416 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 11:27:00,416 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [939957525] [2020-08-18 11:27:00,417 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 11:27:00,417 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-18 11:27:00,417 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1447536675] [2020-08-18 11:27:00,418 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-18 11:27:00,426 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 11:27:00,426 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-18 11:27:00,426 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2020-08-18 11:27:00,426 INFO L87 Difference]: Start difference. First operand 43 states and 47 transitions. Second operand 14 states. [2020-08-18 11:27:00,638 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 11:27:00,638 INFO L93 Difference]: Finished difference Result 64 states and 72 transitions. [2020-08-18 11:27:00,639 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-18 11:27:00,639 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 36 [2020-08-18 11:27:00,639 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 11:27:00,640 INFO L225 Difference]: With dead ends: 64 [2020-08-18 11:27:00,640 INFO L226 Difference]: Without dead ends: 46 [2020-08-18 11:27:00,640 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 11:27:00,641 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-18 11:27:00,645 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2020-08-18 11:27:00,645 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-18 11:27:00,646 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 49 transitions. [2020-08-18 11:27:00,646 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 49 transitions. Word has length 36 [2020-08-18 11:27:00,646 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 11:27:00,647 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 49 transitions. [2020-08-18 11:27:00,647 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-18 11:27:00,647 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 49 transitions. [2020-08-18 11:27:00,647 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-18 11:27:00,648 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 11:27:00,648 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 11:27:00,648 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-18 11:27:00,648 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 11:27:00,648 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 11:27:00,649 INFO L82 PathProgramCache]: Analyzing trace with hash -1469933414, now seen corresponding path program 9 times [2020-08-18 11:27:00,649 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 11:27:00,649 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [531444750] [2020-08-18 11:27:00,649 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 11:27:00,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:00,679 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 11:27:00,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:00,691 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 11:27:00,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:00,701 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 11:27:00,702 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [531444750] [2020-08-18 11:27:00,702 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 11:27:00,702 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-18 11:27:00,702 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1716801385] [2020-08-18 11:27:00,703 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 11:27:00,703 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 11:27:00,703 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 11:27:00,704 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-18 11:27:00,704 INFO L87 Difference]: Start difference. First operand 45 states and 49 transitions. Second operand 5 states. [2020-08-18 11:27:00,795 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 11:27:00,795 INFO L93 Difference]: Finished difference Result 65 states and 74 transitions. [2020-08-18 11:27:00,795 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-18 11:27:00,795 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 38 [2020-08-18 11:27:00,796 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 11:27:00,797 INFO L225 Difference]: With dead ends: 65 [2020-08-18 11:27:00,798 INFO L226 Difference]: Without dead ends: 53 [2020-08-18 11:27:00,798 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 11:27:00,798 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-08-18 11:27:00,807 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 46. [2020-08-18 11:27:00,808 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-18 11:27:00,808 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 50 transitions. [2020-08-18 11:27:00,809 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 50 transitions. Word has length 38 [2020-08-18 11:27:00,809 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 11:27:00,809 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 50 transitions. [2020-08-18 11:27:00,809 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 11:27:00,809 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 50 transitions. [2020-08-18 11:27:00,810 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-18 11:27:00,810 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 11:27:00,810 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 11:27:00,810 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-18 11:27:00,811 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 11:27:00,811 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 11:27:00,811 INFO L82 PathProgramCache]: Analyzing trace with hash -1568016950, now seen corresponding path program 1 times [2020-08-18 11:27:00,811 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 11:27:00,811 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2085182888] [2020-08-18 11:27:00,812 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 11:27:00,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:00,848 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 11:27:00,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:00,860 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 11:27:00,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:00,870 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 11:27:00,870 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2085182888] [2020-08-18 11:27:00,871 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 11:27:00,871 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-18 11:27:00,871 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1166256221] [2020-08-18 11:27:00,871 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 11:27:00,872 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 11:27:00,872 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 11:27:00,872 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-08-18 11:27:00,872 INFO L87 Difference]: Start difference. First operand 46 states and 50 transitions. Second operand 6 states. [2020-08-18 11:27:00,973 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 11:27:00,973 INFO L93 Difference]: Finished difference Result 73 states and 85 transitions. [2020-08-18 11:27:00,974 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 11:27:00,974 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 41 [2020-08-18 11:27:00,974 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 11:27:00,975 INFO L225 Difference]: With dead ends: 73 [2020-08-18 11:27:00,975 INFO L226 Difference]: Without dead ends: 61 [2020-08-18 11:27:00,976 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 11:27:00,977 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-08-18 11:27:00,981 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 49. [2020-08-18 11:27:00,982 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-18 11:27:00,984 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 54 transitions. [2020-08-18 11:27:00,984 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 54 transitions. Word has length 41 [2020-08-18 11:27:00,985 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 11:27:00,986 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 54 transitions. [2020-08-18 11:27:00,986 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 11:27:00,986 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 54 transitions. [2020-08-18 11:27:00,989 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-18 11:27:00,989 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 11:27:00,989 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 11:27:00,990 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-18 11:27:00,990 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 11:27:00,990 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 11:27:00,990 INFO L82 PathProgramCache]: Analyzing trace with hash 1298090650, now seen corresponding path program 2 times [2020-08-18 11:27:00,990 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 11:27:00,991 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [730494075] [2020-08-18 11:27:00,991 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 11:27:01,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:01,057 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 11:27:01,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:01,069 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 11:27:01,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:01,083 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 11:27:01,083 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [730494075] [2020-08-18 11:27:01,084 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 11:27:01,084 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-18 11:27:01,084 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [677169751] [2020-08-18 11:27:01,084 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 11:27:01,085 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 11:27:01,085 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 11:27:01,086 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-18 11:27:01,086 INFO L87 Difference]: Start difference. First operand 49 states and 54 transitions. Second operand 5 states. [2020-08-18 11:27:01,153 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 11:27:01,153 INFO L93 Difference]: Finished difference Result 69 states and 78 transitions. [2020-08-18 11:27:01,153 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-18 11:27:01,154 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 44 [2020-08-18 11:27:01,154 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 11:27:01,154 INFO L225 Difference]: With dead ends: 69 [2020-08-18 11:27:01,155 INFO L226 Difference]: Without dead ends: 49 [2020-08-18 11:27:01,155 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 11:27:01,156 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-18 11:27:01,165 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-18 11:27:01,166 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-18 11:27:01,166 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 52 transitions. [2020-08-18 11:27:01,166 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 52 transitions. Word has length 44 [2020-08-18 11:27:01,167 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 11:27:01,167 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 52 transitions. [2020-08-18 11:27:01,167 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 11:27:01,167 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 52 transitions. [2020-08-18 11:27:01,168 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-18 11:27:01,168 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 11:27:01,168 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 11:27:01,169 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-18 11:27:01,169 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 11:27:01,169 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 11:27:01,169 INFO L82 PathProgramCache]: Analyzing trace with hash 318257626, now seen corresponding path program 1 times [2020-08-18 11:27:01,169 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 11:27:01,171 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1505074688] [2020-08-18 11:27:01,171 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 11:27:01,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:01,236 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 11:27:01,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:01,247 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 11:27:01,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:01,631 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 11:27:01,632 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1505074688] [2020-08-18 11:27:01,632 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 11:27:01,632 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-18 11:27:01,633 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1106559596] [2020-08-18 11:27:01,633 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-18 11:27:01,633 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 11:27:01,633 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-18 11:27:01,634 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=138, Unknown=0, NotChecked=0, Total=210 [2020-08-18 11:27:01,634 INFO L87 Difference]: Start difference. First operand 49 states and 52 transitions. Second operand 15 states. [2020-08-18 11:27:01,860 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 11:27:01,860 INFO L93 Difference]: Finished difference Result 74 states and 80 transitions. [2020-08-18 11:27:01,860 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-18 11:27:01,860 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 44 [2020-08-18 11:27:01,861 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 11:27:01,861 INFO L225 Difference]: With dead ends: 74 [2020-08-18 11:27:01,861 INFO L226 Difference]: Without dead ends: 52 [2020-08-18 11:27:01,862 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 11:27:01,862 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-18 11:27:01,866 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2020-08-18 11:27:01,867 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-18 11:27:01,867 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 54 transitions. [2020-08-18 11:27:01,868 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 54 transitions. Word has length 44 [2020-08-18 11:27:01,868 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 11:27:01,868 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 54 transitions. [2020-08-18 11:27:01,868 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-18 11:27:01,868 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 54 transitions. [2020-08-18 11:27:01,869 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-18 11:27:01,869 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 11:27:01,869 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 11:27:01,869 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-18 11:27:01,869 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 11:27:01,870 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 11:27:01,870 INFO L82 PathProgramCache]: Analyzing trace with hash -935313508, now seen corresponding path program 2 times [2020-08-18 11:27:01,870 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 11:27:01,870 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1484684330] [2020-08-18 11:27:01,870 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 11:27:01,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:01,904 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 11:27:01,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:01,914 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 11:27:01,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:02,393 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 11:27:02,393 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1484684330] [2020-08-18 11:27:02,394 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 11:27:02,394 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-18 11:27:02,394 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2126927423] [2020-08-18 11:27:02,395 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-18 11:27:02,395 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 11:27:02,395 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-18 11:27:02,396 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=156, Unknown=0, NotChecked=0, Total=240 [2020-08-18 11:27:02,396 INFO L87 Difference]: Start difference. First operand 51 states and 54 transitions. Second operand 16 states. [2020-08-18 11:27:02,609 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 11:27:02,609 INFO L93 Difference]: Finished difference Result 76 states and 82 transitions. [2020-08-18 11:27:02,610 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-18 11:27:02,610 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 46 [2020-08-18 11:27:02,610 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 11:27:02,611 INFO L225 Difference]: With dead ends: 76 [2020-08-18 11:27:02,611 INFO L226 Difference]: Without dead ends: 54 [2020-08-18 11:27:02,611 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=118, Invalid=224, Unknown=0, NotChecked=0, Total=342 [2020-08-18 11:27:02,614 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-18 11:27:02,617 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2020-08-18 11:27:02,617 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-18 11:27:02,618 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 56 transitions. [2020-08-18 11:27:02,618 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 56 transitions. Word has length 46 [2020-08-18 11:27:02,618 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 11:27:02,618 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 56 transitions. [2020-08-18 11:27:02,619 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-18 11:27:02,623 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 56 transitions. [2020-08-18 11:27:02,623 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-18 11:27:02,624 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 11:27:02,624 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 11:27:02,624 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-18 11:27:02,624 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 11:27:02,624 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 11:27:02,624 INFO L82 PathProgramCache]: Analyzing trace with hash 1268636894, now seen corresponding path program 3 times [2020-08-18 11:27:02,625 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 11:27:02,625 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [27120553] [2020-08-18 11:27:02,625 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 11:27:02,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:02,670 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 11:27:02,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:02,679 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 11:27:02,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:03,113 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 11:27:03,114 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [27120553] [2020-08-18 11:27:03,114 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 11:27:03,114 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-18 11:27:03,114 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1672312129] [2020-08-18 11:27:03,115 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-18 11:27:03,115 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 11:27:03,115 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-18 11:27:03,115 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=175, Unknown=0, NotChecked=0, Total=272 [2020-08-18 11:27:03,115 INFO L87 Difference]: Start difference. First operand 53 states and 56 transitions. Second operand 17 states. [2020-08-18 11:27:03,373 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 11:27:03,373 INFO L93 Difference]: Finished difference Result 78 states and 84 transitions. [2020-08-18 11:27:03,373 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-18 11:27:03,374 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 48 [2020-08-18 11:27:03,374 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 11:27:03,374 INFO L225 Difference]: With dead ends: 78 [2020-08-18 11:27:03,375 INFO L226 Difference]: Without dead ends: 56 [2020-08-18 11:27:03,375 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=133, Invalid=247, Unknown=0, NotChecked=0, Total=380 [2020-08-18 11:27:03,376 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-08-18 11:27:03,380 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2020-08-18 11:27:03,380 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-18 11:27:03,380 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 58 transitions. [2020-08-18 11:27:03,381 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 58 transitions. Word has length 48 [2020-08-18 11:27:03,381 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 11:27:03,381 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 58 transitions. [2020-08-18 11:27:03,381 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-18 11:27:03,381 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 58 transitions. [2020-08-18 11:27:03,382 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-18 11:27:03,382 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 11:27:03,382 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 11:27:03,382 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-18 11:27:03,382 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 11:27:03,383 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 11:27:03,383 INFO L82 PathProgramCache]: Analyzing trace with hash 1846096288, now seen corresponding path program 4 times [2020-08-18 11:27:03,383 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 11:27:03,383 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1579098076] [2020-08-18 11:27:03,383 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 11:27:03,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:03,429 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 11:27:03,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:03,441 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 11:27:03,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:03,920 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 11:27:03,920 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1579098076] [2020-08-18 11:27:03,920 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 11:27:03,921 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-18 11:27:03,921 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [796643080] [2020-08-18 11:27:03,921 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-18 11:27:03,922 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 11:27:03,922 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-18 11:27:03,922 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=195, Unknown=0, NotChecked=0, Total=306 [2020-08-18 11:27:03,922 INFO L87 Difference]: Start difference. First operand 55 states and 58 transitions. Second operand 18 states. [2020-08-18 11:27:04,152 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 11:27:04,152 INFO L93 Difference]: Finished difference Result 80 states and 86 transitions. [2020-08-18 11:27:04,152 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-18 11:27:04,153 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 50 [2020-08-18 11:27:04,153 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 11:27:04,154 INFO L225 Difference]: With dead ends: 80 [2020-08-18 11:27:04,154 INFO L226 Difference]: Without dead ends: 58 [2020-08-18 11:27:04,155 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 11:27:04,157 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-18 11:27:04,160 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2020-08-18 11:27:04,161 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-18 11:27:04,161 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 60 transitions. [2020-08-18 11:27:04,161 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 60 transitions. Word has length 50 [2020-08-18 11:27:04,161 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 11:27:04,162 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 60 transitions. [2020-08-18 11:27:04,162 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-18 11:27:04,162 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 60 transitions. [2020-08-18 11:27:04,162 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-18 11:27:04,163 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 11:27:04,163 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 11:27:04,163 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-18 11:27:04,163 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 11:27:04,163 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 11:27:04,163 INFO L82 PathProgramCache]: Analyzing trace with hash -1561174558, now seen corresponding path program 5 times [2020-08-18 11:27:04,164 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 11:27:04,164 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1021092567] [2020-08-18 11:27:04,164 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 11:27:04,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:04,203 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 11:27:04,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:04,214 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 11:27:04,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:04,765 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 11:27:04,765 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1021092567] [2020-08-18 11:27:04,766 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 11:27:04,766 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-18 11:27:04,766 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [250706314] [2020-08-18 11:27:04,766 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-18 11:27:04,766 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 11:27:04,767 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-18 11:27:04,767 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=216, Unknown=0, NotChecked=0, Total=342 [2020-08-18 11:27:04,767 INFO L87 Difference]: Start difference. First operand 57 states and 60 transitions. Second operand 19 states. [2020-08-18 11:27:05,019 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 11:27:05,019 INFO L93 Difference]: Finished difference Result 82 states and 88 transitions. [2020-08-18 11:27:05,019 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-18 11:27:05,020 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 52 [2020-08-18 11:27:05,020 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 11:27:05,021 INFO L225 Difference]: With dead ends: 82 [2020-08-18 11:27:05,021 INFO L226 Difference]: Without dead ends: 60 [2020-08-18 11:27:05,022 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=166, Invalid=296, Unknown=0, NotChecked=0, Total=462 [2020-08-18 11:27:05,022 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-08-18 11:27:05,025 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 59. [2020-08-18 11:27:05,025 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-08-18 11:27:05,026 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 62 transitions. [2020-08-18 11:27:05,026 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 62 transitions. Word has length 52 [2020-08-18 11:27:05,026 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 11:27:05,026 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 62 transitions. [2020-08-18 11:27:05,026 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-18 11:27:05,026 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 62 transitions. [2020-08-18 11:27:05,027 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-18 11:27:05,027 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 11:27:05,027 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 11:27:05,028 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-18 11:27:05,028 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 11:27:05,028 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 11:27:05,028 INFO L82 PathProgramCache]: Analyzing trace with hash 1111589284, now seen corresponding path program 6 times [2020-08-18 11:27:05,028 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 11:27:05,028 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [768857106] [2020-08-18 11:27:05,029 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 11:27:05,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:05,064 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 11:27:05,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:05,086 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 11:27:05,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:05,662 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 11:27:05,662 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [768857106] [2020-08-18 11:27:05,662 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 11:27:05,662 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-18 11:27:05,663 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1137852218] [2020-08-18 11:27:05,663 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-18 11:27:05,663 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 11:27:05,663 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-18 11:27:05,664 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=142, Invalid=238, Unknown=0, NotChecked=0, Total=380 [2020-08-18 11:27:05,664 INFO L87 Difference]: Start difference. First operand 59 states and 62 transitions. Second operand 20 states. [2020-08-18 11:27:05,948 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 11:27:05,948 INFO L93 Difference]: Finished difference Result 84 states and 90 transitions. [2020-08-18 11:27:05,949 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-18 11:27:05,949 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 54 [2020-08-18 11:27:05,950 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 11:27:05,950 INFO L225 Difference]: With dead ends: 84 [2020-08-18 11:27:05,951 INFO L226 Difference]: Without dead ends: 62 [2020-08-18 11:27:05,951 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 11:27:05,952 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-08-18 11:27:05,955 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2020-08-18 11:27:05,955 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-08-18 11:27:05,956 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 64 transitions. [2020-08-18 11:27:05,956 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 64 transitions. Word has length 54 [2020-08-18 11:27:05,956 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 11:27:05,956 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 64 transitions. [2020-08-18 11:27:05,956 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-18 11:27:05,957 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 64 transitions. [2020-08-18 11:27:05,957 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-18 11:27:05,957 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 11:27:05,957 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 11:27:05,958 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-18 11:27:05,958 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 11:27:05,958 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 11:27:05,958 INFO L82 PathProgramCache]: Analyzing trace with hash 1247198438, now seen corresponding path program 7 times [2020-08-18 11:27:05,958 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 11:27:05,959 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1291565211] [2020-08-18 11:27:05,959 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 11:27:05,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:06,029 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 11:27:06,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:06,039 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 11:27:06,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:06,814 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 11:27:06,815 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1291565211] [2020-08-18 11:27:06,815 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 11:27:06,815 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-18 11:27:06,815 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [99102631] [2020-08-18 11:27:06,818 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-18 11:27:06,818 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 11:27:06,818 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-18 11:27:06,819 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=159, Invalid=261, Unknown=0, NotChecked=0, Total=420 [2020-08-18 11:27:06,819 INFO L87 Difference]: Start difference. First operand 61 states and 64 transitions. Second operand 21 states. [2020-08-18 11:27:07,032 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 11:27:07,033 INFO L93 Difference]: Finished difference Result 86 states and 92 transitions. [2020-08-18 11:27:07,033 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-18 11:27:07,033 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 56 [2020-08-18 11:27:07,034 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 11:27:07,034 INFO L225 Difference]: With dead ends: 86 [2020-08-18 11:27:07,034 INFO L226 Difference]: Without dead ends: 64 [2020-08-18 11:27:07,037 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=203, Invalid=349, Unknown=0, NotChecked=0, Total=552 [2020-08-18 11:27:07,038 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-08-18 11:27:07,043 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2020-08-18 11:27:07,043 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2020-08-18 11:27:07,044 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 66 transitions. [2020-08-18 11:27:07,044 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 66 transitions. Word has length 56 [2020-08-18 11:27:07,044 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 11:27:07,044 INFO L479 AbstractCegarLoop]: Abstraction has 63 states and 66 transitions. [2020-08-18 11:27:07,044 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-18 11:27:07,044 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 66 transitions. [2020-08-18 11:27:07,046 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-08-18 11:27:07,047 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 11:27:07,047 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 11:27:07,047 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-18 11:27:07,047 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 11:27:07,047 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 11:27:07,047 INFO L82 PathProgramCache]: Analyzing trace with hash -1576390744, now seen corresponding path program 8 times [2020-08-18 11:27:07,048 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 11:27:07,048 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [138141244] [2020-08-18 11:27:07,048 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 11:27:07,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:07,099 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 11:27:07,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:07,120 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 11:27:07,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:07,978 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 11:27:07,978 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [138141244] [2020-08-18 11:27:07,978 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 11:27:07,978 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-18 11:27:07,979 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [956843413] [2020-08-18 11:27:07,980 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-18 11:27:07,981 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 11:27:07,981 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-18 11:27:07,981 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=177, Invalid=285, Unknown=0, NotChecked=0, Total=462 [2020-08-18 11:27:07,981 INFO L87 Difference]: Start difference. First operand 63 states and 66 transitions. Second operand 22 states. [2020-08-18 11:27:08,233 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 11:27:08,233 INFO L93 Difference]: Finished difference Result 88 states and 94 transitions. [2020-08-18 11:27:08,234 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-18 11:27:08,234 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 58 [2020-08-18 11:27:08,234 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 11:27:08,236 INFO L225 Difference]: With dead ends: 88 [2020-08-18 11:27:08,236 INFO L226 Difference]: Without dead ends: 66 [2020-08-18 11:27:08,237 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=223, Invalid=377, Unknown=0, NotChecked=0, Total=600 [2020-08-18 11:27:08,238 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-08-18 11:27:08,241 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2020-08-18 11:27:08,241 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-08-18 11:27:08,242 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 68 transitions. [2020-08-18 11:27:08,242 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 68 transitions. Word has length 58 [2020-08-18 11:27:08,242 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 11:27:08,242 INFO L479 AbstractCegarLoop]: Abstraction has 65 states and 68 transitions. [2020-08-18 11:27:08,243 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-18 11:27:08,243 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 68 transitions. [2020-08-18 11:27:08,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2020-08-18 11:27:08,243 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 11:27:08,243 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 11:27:08,244 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-18 11:27:08,244 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 11:27:08,244 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 11:27:08,244 INFO L82 PathProgramCache]: Analyzing trace with hash -626263574, now seen corresponding path program 9 times [2020-08-18 11:27:08,244 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 11:27:08,245 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [448163991] [2020-08-18 11:27:08,245 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 11:27:08,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:08,292 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 11:27:08,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:08,302 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 11:27:08,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:09,034 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 11:27:09,035 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [448163991] [2020-08-18 11:27:09,036 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 11:27:09,036 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-18 11:27:09,036 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1204769] [2020-08-18 11:27:09,036 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-18 11:27:09,037 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 11:27:09,037 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-18 11:27:09,037 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=196, Invalid=310, Unknown=0, NotChecked=0, Total=506 [2020-08-18 11:27:09,037 INFO L87 Difference]: Start difference. First operand 65 states and 68 transitions. Second operand 23 states. [2020-08-18 11:27:09,325 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 11:27:09,325 INFO L93 Difference]: Finished difference Result 90 states and 96 transitions. [2020-08-18 11:27:09,326 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-18 11:27:09,327 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 60 [2020-08-18 11:27:09,327 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 11:27:09,327 INFO L225 Difference]: With dead ends: 90 [2020-08-18 11:27:09,327 INFO L226 Difference]: Without dead ends: 68 [2020-08-18 11:27:09,328 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=244, Invalid=406, Unknown=0, NotChecked=0, Total=650 [2020-08-18 11:27:09,328 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-08-18 11:27:09,331 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 67. [2020-08-18 11:27:09,332 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-08-18 11:27:09,332 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 70 transitions. [2020-08-18 11:27:09,332 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 70 transitions. Word has length 60 [2020-08-18 11:27:09,333 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 11:27:09,333 INFO L479 AbstractCegarLoop]: Abstraction has 67 states and 70 transitions. [2020-08-18 11:27:09,333 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-18 11:27:09,333 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 70 transitions. [2020-08-18 11:27:09,333 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2020-08-18 11:27:09,333 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 11:27:09,334 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 11:27:09,334 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-18 11:27:09,334 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 11:27:09,334 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 11:27:09,334 INFO L82 PathProgramCache]: Analyzing trace with hash 1912880044, now seen corresponding path program 10 times [2020-08-18 11:27:09,334 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 11:27:09,335 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [746203196] [2020-08-18 11:27:09,335 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 11:27:09,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:09,381 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 11:27:09,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:09,393 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 11:27:09,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:10,211 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 11:27:10,212 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [746203196] [2020-08-18 11:27:10,212 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 11:27:10,212 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-18 11:27:10,212 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1836456217] [2020-08-18 11:27:10,213 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-18 11:27:10,213 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 11:27:10,213 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-18 11:27:10,214 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=216, Invalid=336, Unknown=0, NotChecked=0, Total=552 [2020-08-18 11:27:10,214 INFO L87 Difference]: Start difference. First operand 67 states and 70 transitions. Second operand 24 states. [2020-08-18 11:27:10,475 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 11:27:10,475 INFO L93 Difference]: Finished difference Result 92 states and 98 transitions. [2020-08-18 11:27:10,476 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-18 11:27:10,476 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 62 [2020-08-18 11:27:10,476 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 11:27:10,477 INFO L225 Difference]: With dead ends: 92 [2020-08-18 11:27:10,477 INFO L226 Difference]: Without dead ends: 70 [2020-08-18 11:27:10,479 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=266, Invalid=436, Unknown=0, NotChecked=0, Total=702 [2020-08-18 11:27:10,479 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-08-18 11:27:10,485 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 69. [2020-08-18 11:27:10,485 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2020-08-18 11:27:10,486 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 72 transitions. [2020-08-18 11:27:10,486 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 72 transitions. Word has length 62 [2020-08-18 11:27:10,486 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 11:27:10,486 INFO L479 AbstractCegarLoop]: Abstraction has 69 states and 72 transitions. [2020-08-18 11:27:10,486 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-18 11:27:10,486 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 72 transitions. [2020-08-18 11:27:10,487 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2020-08-18 11:27:10,487 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 11:27:10,487 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 11:27:10,487 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-18 11:27:10,487 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 11:27:10,488 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 11:27:10,488 INFO L82 PathProgramCache]: Analyzing trace with hash -1806494482, now seen corresponding path program 11 times [2020-08-18 11:27:10,488 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 11:27:10,488 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1409625619] [2020-08-18 11:27:10,488 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 11:27:10,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:10,557 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 11:27:10,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:10,567 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 11:27:10,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:11,612 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 11:27:11,612 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1409625619] [2020-08-18 11:27:11,613 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 11:27:11,613 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-18 11:27:11,613 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1782466309] [2020-08-18 11:27:11,613 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-18 11:27:11,613 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 11:27:11,614 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-18 11:27:11,614 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=237, Invalid=363, Unknown=0, NotChecked=0, Total=600 [2020-08-18 11:27:11,614 INFO L87 Difference]: Start difference. First operand 69 states and 72 transitions. Second operand 25 states. [2020-08-18 11:27:11,952 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 11:27:11,952 INFO L93 Difference]: Finished difference Result 94 states and 100 transitions. [2020-08-18 11:27:11,952 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-18 11:27:11,952 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 64 [2020-08-18 11:27:11,953 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 11:27:11,953 INFO L225 Difference]: With dead ends: 94 [2020-08-18 11:27:11,954 INFO L226 Difference]: Without dead ends: 72 [2020-08-18 11:27:11,955 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=289, Invalid=467, Unknown=0, NotChecked=0, Total=756 [2020-08-18 11:27:11,955 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-08-18 11:27:11,958 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 71. [2020-08-18 11:27:11,958 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-08-18 11:27:11,959 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 74 transitions. [2020-08-18 11:27:11,959 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 74 transitions. Word has length 64 [2020-08-18 11:27:11,959 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 11:27:11,959 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 74 transitions. [2020-08-18 11:27:11,959 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-18 11:27:11,959 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 74 transitions. [2020-08-18 11:27:11,960 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2020-08-18 11:27:11,960 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 11:27:11,960 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 11:27:11,960 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-18 11:27:11,960 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 11:27:11,961 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 11:27:11,961 INFO L82 PathProgramCache]: Analyzing trace with hash 1582343600, now seen corresponding path program 12 times [2020-08-18 11:27:11,961 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 11:27:11,961 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1206673246] [2020-08-18 11:27:11,961 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 11:27:11,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:12,004 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 11:27:12,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:12,014 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 11:27:12,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:12,878 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 11:27:12,878 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1206673246] [2020-08-18 11:27:12,878 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 11:27:12,878 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-18 11:27:12,879 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1024712240] [2020-08-18 11:27:12,879 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-18 11:27:12,879 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 11:27:12,880 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-18 11:27:12,880 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=259, Invalid=391, Unknown=0, NotChecked=0, Total=650 [2020-08-18 11:27:12,880 INFO L87 Difference]: Start difference. First operand 71 states and 74 transitions. Second operand 26 states. [2020-08-18 11:27:13,200 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 11:27:13,200 INFO L93 Difference]: Finished difference Result 96 states and 102 transitions. [2020-08-18 11:27:13,201 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-18 11:27:13,201 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 66 [2020-08-18 11:27:13,201 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 11:27:13,202 INFO L225 Difference]: With dead ends: 96 [2020-08-18 11:27:13,202 INFO L226 Difference]: Without dead ends: 74 [2020-08-18 11:27:13,202 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=313, Invalid=499, Unknown=0, NotChecked=0, Total=812 [2020-08-18 11:27:13,203 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2020-08-18 11:27:13,206 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 73. [2020-08-18 11:27:13,206 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-08-18 11:27:13,206 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 76 transitions. [2020-08-18 11:27:13,206 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 76 transitions. Word has length 66 [2020-08-18 11:27:13,207 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 11:27:13,207 INFO L479 AbstractCegarLoop]: Abstraction has 73 states and 76 transitions. [2020-08-18 11:27:13,207 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-18 11:27:13,207 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 76 transitions. [2020-08-18 11:27:13,207 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-08-18 11:27:13,207 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 11:27:13,208 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 11:27:13,208 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-18 11:27:13,208 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 11:27:13,208 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 11:27:13,208 INFO L82 PathProgramCache]: Analyzing trace with hash -1624437262, now seen corresponding path program 13 times [2020-08-18 11:27:13,208 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 11:27:13,209 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1464092360] [2020-08-18 11:27:13,209 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 11:27:13,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:13,256 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 11:27:13,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:13,267 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 11:27:13,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:14,268 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 11:27:14,268 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1464092360] [2020-08-18 11:27:14,268 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 11:27:14,268 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-18 11:27:14,269 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1816049166] [2020-08-18 11:27:14,269 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-18 11:27:14,269 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 11:27:14,269 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-18 11:27:14,270 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=282, Invalid=420, Unknown=0, NotChecked=0, Total=702 [2020-08-18 11:27:14,270 INFO L87 Difference]: Start difference. First operand 73 states and 76 transitions. Second operand 27 states. [2020-08-18 11:27:14,484 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 11:27:14,484 INFO L93 Difference]: Finished difference Result 98 states and 104 transitions. [2020-08-18 11:27:14,485 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-18 11:27:14,485 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 68 [2020-08-18 11:27:14,485 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 11:27:14,486 INFO L225 Difference]: With dead ends: 98 [2020-08-18 11:27:14,486 INFO L226 Difference]: Without dead ends: 76 [2020-08-18 11:27:14,487 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=338, Invalid=532, Unknown=0, NotChecked=0, Total=870 [2020-08-18 11:27:14,487 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-08-18 11:27:14,490 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 75. [2020-08-18 11:27:14,490 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2020-08-18 11:27:14,491 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 78 transitions. [2020-08-18 11:27:14,491 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 78 transitions. Word has length 68 [2020-08-18 11:27:14,491 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 11:27:14,491 INFO L479 AbstractCegarLoop]: Abstraction has 75 states and 78 transitions. [2020-08-18 11:27:14,491 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-18 11:27:14,491 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 78 transitions. [2020-08-18 11:27:14,492 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2020-08-18 11:27:14,492 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 11:27:14,492 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 11:27:14,492 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-18 11:27:14,492 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 11:27:14,492 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 11:27:14,493 INFO L82 PathProgramCache]: Analyzing trace with hash 445672884, now seen corresponding path program 14 times [2020-08-18 11:27:14,493 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 11:27:14,493 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [526453769] [2020-08-18 11:27:14,493 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 11:27:14,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:14,540 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 11:27:14,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:14,551 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 11:27:14,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:15,579 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 11:27:15,579 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [526453769] [2020-08-18 11:27:15,579 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 11:27:15,580 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-18 11:27:15,580 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1797033618] [2020-08-18 11:27:15,580 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-18 11:27:15,580 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 11:27:15,581 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-18 11:27:15,581 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=306, Invalid=450, Unknown=0, NotChecked=0, Total=756 [2020-08-18 11:27:15,581 INFO L87 Difference]: Start difference. First operand 75 states and 78 transitions. Second operand 28 states. [2020-08-18 11:27:15,872 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 11:27:15,872 INFO L93 Difference]: Finished difference Result 100 states and 106 transitions. [2020-08-18 11:27:15,873 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-18 11:27:15,873 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 70 [2020-08-18 11:27:15,873 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 11:27:15,874 INFO L225 Difference]: With dead ends: 100 [2020-08-18 11:27:15,874 INFO L226 Difference]: Without dead ends: 78 [2020-08-18 11:27:15,875 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=364, Invalid=566, Unknown=0, NotChecked=0, Total=930 [2020-08-18 11:27:15,877 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-08-18 11:27:15,880 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 77. [2020-08-18 11:27:15,880 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2020-08-18 11:27:15,881 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 80 transitions. [2020-08-18 11:27:15,881 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 80 transitions. Word has length 70 [2020-08-18 11:27:15,881 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 11:27:15,881 INFO L479 AbstractCegarLoop]: Abstraction has 77 states and 80 transitions. [2020-08-18 11:27:15,881 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-18 11:27:15,881 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 80 transitions. [2020-08-18 11:27:15,882 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2020-08-18 11:27:15,882 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 11:27:15,882 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 11:27:15,882 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-18 11:27:15,882 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 11:27:15,882 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 11:27:15,883 INFO L82 PathProgramCache]: Analyzing trace with hash 1251665142, now seen corresponding path program 15 times [2020-08-18 11:27:15,883 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 11:27:15,883 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [585316033] [2020-08-18 11:27:15,883 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 11:27:15,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:15,929 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 11:27:15,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:15,939 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 11:27:15,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:17,046 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 11:27:17,047 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [585316033] [2020-08-18 11:27:17,047 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 11:27:17,047 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-18 11:27:17,047 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1747734836] [2020-08-18 11:27:17,047 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-18 11:27:17,047 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 11:27:17,048 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-18 11:27:17,048 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=331, Invalid=481, Unknown=0, NotChecked=0, Total=812 [2020-08-18 11:27:17,048 INFO L87 Difference]: Start difference. First operand 77 states and 80 transitions. Second operand 29 states. [2020-08-18 11:27:17,400 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 11:27:17,400 INFO L93 Difference]: Finished difference Result 102 states and 108 transitions. [2020-08-18 11:27:17,401 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-18 11:27:17,401 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 72 [2020-08-18 11:27:17,401 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 11:27:17,402 INFO L225 Difference]: With dead ends: 102 [2020-08-18 11:27:17,402 INFO L226 Difference]: Without dead ends: 80 [2020-08-18 11:27:17,403 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=391, Invalid=601, Unknown=0, NotChecked=0, Total=992 [2020-08-18 11:27:17,403 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-08-18 11:27:17,407 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 79. [2020-08-18 11:27:17,407 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-08-18 11:27:17,407 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 82 transitions. [2020-08-18 11:27:17,407 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 82 transitions. Word has length 72 [2020-08-18 11:27:17,407 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 11:27:17,408 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 82 transitions. [2020-08-18 11:27:17,408 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-18 11:27:17,408 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 82 transitions. [2020-08-18 11:27:17,408 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2020-08-18 11:27:17,408 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 11:27:17,408 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 11:27:17,409 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-18 11:27:17,409 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 11:27:17,409 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 11:27:17,409 INFO L82 PathProgramCache]: Analyzing trace with hash -1578855496, now seen corresponding path program 16 times [2020-08-18 11:27:17,409 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 11:27:17,409 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1113194625] [2020-08-18 11:27:17,410 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 11:27:17,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:17,454 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 11:27:17,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:17,465 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 11:27:17,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:18,628 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 11:27:18,629 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1113194625] [2020-08-18 11:27:18,629 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 11:27:18,629 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-18 11:27:18,629 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1449857352] [2020-08-18 11:27:18,630 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-18 11:27:18,630 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 11:27:18,630 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-18 11:27:18,631 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=357, Invalid=513, Unknown=0, NotChecked=0, Total=870 [2020-08-18 11:27:18,631 INFO L87 Difference]: Start difference. First operand 79 states and 82 transitions. Second operand 30 states. [2020-08-18 11:27:18,903 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 11:27:18,903 INFO L93 Difference]: Finished difference Result 104 states and 110 transitions. [2020-08-18 11:27:18,904 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-18 11:27:18,904 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 74 [2020-08-18 11:27:18,904 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 11:27:18,905 INFO L225 Difference]: With dead ends: 104 [2020-08-18 11:27:18,905 INFO L226 Difference]: Without dead ends: 82 [2020-08-18 11:27:18,906 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=419, Invalid=637, Unknown=0, NotChecked=0, Total=1056 [2020-08-18 11:27:18,906 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-08-18 11:27:18,913 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 81. [2020-08-18 11:27:18,914 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2020-08-18 11:27:18,914 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 84 transitions. [2020-08-18 11:27:18,914 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 84 transitions. Word has length 74 [2020-08-18 11:27:18,914 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 11:27:18,915 INFO L479 AbstractCegarLoop]: Abstraction has 81 states and 84 transitions. [2020-08-18 11:27:18,915 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-18 11:27:18,915 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 84 transitions. [2020-08-18 11:27:18,915 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2020-08-18 11:27:18,915 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 11:27:18,916 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 11:27:18,916 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-18 11:27:18,916 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 11:27:18,916 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 11:27:18,916 INFO L82 PathProgramCache]: Analyzing trace with hash 1300077050, now seen corresponding path program 17 times [2020-08-18 11:27:18,916 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 11:27:18,917 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1324952678] [2020-08-18 11:27:18,917 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 11:27:18,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:18,961 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 11:27:18,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:18,978 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 11:27:18,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:20,244 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 11:27:20,245 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1324952678] [2020-08-18 11:27:20,245 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 11:27:20,245 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-18 11:27:20,245 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2019046635] [2020-08-18 11:27:20,245 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-18 11:27:20,245 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 11:27:20,246 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-18 11:27:20,246 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=384, Invalid=546, Unknown=0, NotChecked=0, Total=930 [2020-08-18 11:27:20,246 INFO L87 Difference]: Start difference. First operand 81 states and 84 transitions. Second operand 31 states. [2020-08-18 11:27:20,629 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 11:27:20,629 INFO L93 Difference]: Finished difference Result 106 states and 112 transitions. [2020-08-18 11:27:20,630 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-18 11:27:20,630 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 76 [2020-08-18 11:27:20,630 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 11:27:20,630 INFO L225 Difference]: With dead ends: 106 [2020-08-18 11:27:20,631 INFO L226 Difference]: Without dead ends: 84 [2020-08-18 11:27:20,631 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=448, Invalid=674, Unknown=0, NotChecked=0, Total=1122 [2020-08-18 11:27:20,632 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2020-08-18 11:27:20,635 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 83. [2020-08-18 11:27:20,635 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2020-08-18 11:27:20,635 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 86 transitions. [2020-08-18 11:27:20,635 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 86 transitions. Word has length 76 [2020-08-18 11:27:20,636 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 11:27:20,636 INFO L479 AbstractCegarLoop]: Abstraction has 83 states and 86 transitions. [2020-08-18 11:27:20,636 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-18 11:27:20,636 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 86 transitions. [2020-08-18 11:27:20,636 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-08-18 11:27:20,636 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 11:27:20,636 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 11:27:20,636 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-18 11:27:20,637 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 11:27:20,637 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 11:27:20,637 INFO L82 PathProgramCache]: Analyzing trace with hash 1995315132, now seen corresponding path program 18 times [2020-08-18 11:27:20,637 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 11:27:20,637 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [875480051] [2020-08-18 11:27:20,637 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 11:27:20,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:20,688 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 11:27:20,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:20,698 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 11:27:20,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:21,957 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 11:27:21,957 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [875480051] [2020-08-18 11:27:21,957 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 11:27:21,957 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-18 11:27:21,957 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [383875057] [2020-08-18 11:27:21,958 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-18 11:27:21,958 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 11:27:21,958 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-18 11:27:21,958 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=412, Invalid=580, Unknown=0, NotChecked=0, Total=992 [2020-08-18 11:27:21,958 INFO L87 Difference]: Start difference. First operand 83 states and 86 transitions. Second operand 32 states. [2020-08-18 11:27:22,348 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 11:27:22,349 INFO L93 Difference]: Finished difference Result 108 states and 114 transitions. [2020-08-18 11:27:22,349 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-18 11:27:22,349 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 78 [2020-08-18 11:27:22,349 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 11:27:22,350 INFO L225 Difference]: With dead ends: 108 [2020-08-18 11:27:22,350 INFO L226 Difference]: Without dead ends: 86 [2020-08-18 11:27:22,351 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=478, Invalid=712, Unknown=0, NotChecked=0, Total=1190 [2020-08-18 11:27:22,352 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2020-08-18 11:27:22,355 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 85. [2020-08-18 11:27:22,355 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2020-08-18 11:27:22,355 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 88 transitions. [2020-08-18 11:27:22,355 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 88 transitions. Word has length 78 [2020-08-18 11:27:22,356 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 11:27:22,356 INFO L479 AbstractCegarLoop]: Abstraction has 85 states and 88 transitions. [2020-08-18 11:27:22,356 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-18 11:27:22,356 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 88 transitions. [2020-08-18 11:27:22,356 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2020-08-18 11:27:22,356 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 11:27:22,356 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 11:27:22,357 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-18 11:27:22,357 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 11:27:22,357 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 11:27:22,357 INFO L82 PathProgramCache]: Analyzing trace with hash 104213758, now seen corresponding path program 19 times [2020-08-18 11:27:22,357 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 11:27:22,357 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [858014451] [2020-08-18 11:27:22,357 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 11:27:22,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:22,425 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 11:27:22,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:22,435 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 11:27:22,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:23,900 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 11:27:23,901 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [858014451] [2020-08-18 11:27:23,901 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 11:27:23,901 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-18 11:27:23,901 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1711183509] [2020-08-18 11:27:23,902 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-18 11:27:23,902 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 11:27:23,902 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-18 11:27:23,902 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=441, Invalid=615, Unknown=0, NotChecked=0, Total=1056 [2020-08-18 11:27:23,903 INFO L87 Difference]: Start difference. First operand 85 states and 88 transitions. Second operand 33 states. [2020-08-18 11:27:24,314 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 11:27:24,314 INFO L93 Difference]: Finished difference Result 110 states and 116 transitions. [2020-08-18 11:27:24,315 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-18 11:27:24,315 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 80 [2020-08-18 11:27:24,315 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 11:27:24,316 INFO L225 Difference]: With dead ends: 110 [2020-08-18 11:27:24,316 INFO L226 Difference]: Without dead ends: 88 [2020-08-18 11:27:24,317 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=509, Invalid=751, Unknown=0, NotChecked=0, Total=1260 [2020-08-18 11:27:24,318 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-08-18 11:27:24,321 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 87. [2020-08-18 11:27:24,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2020-08-18 11:27:24,322 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 90 transitions. [2020-08-18 11:27:24,322 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 90 transitions. Word has length 80 [2020-08-18 11:27:24,322 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 11:27:24,322 INFO L479 AbstractCegarLoop]: Abstraction has 87 states and 90 transitions. [2020-08-18 11:27:24,323 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-18 11:27:24,323 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 90 transitions. [2020-08-18 11:27:24,323 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2020-08-18 11:27:24,323 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 11:27:24,323 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 11:27:24,324 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-18 11:27:24,324 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 11:27:24,324 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 11:27:24,324 INFO L82 PathProgramCache]: Analyzing trace with hash -473040448, now seen corresponding path program 20 times [2020-08-18 11:27:24,324 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 11:27:24,324 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [891134261] [2020-08-18 11:27:24,325 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 11:27:24,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:24,379 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 11:27:24,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:24,389 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 11:27:24,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:25,823 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 11:27:25,824 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [891134261] [2020-08-18 11:27:25,824 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 11:27:25,824 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-18 11:27:25,824 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1759983405] [2020-08-18 11:27:25,825 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-18 11:27:25,825 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 11:27:25,825 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-18 11:27:25,825 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=471, Invalid=651, Unknown=0, NotChecked=0, Total=1122 [2020-08-18 11:27:25,826 INFO L87 Difference]: Start difference. First operand 87 states and 90 transitions. Second operand 34 states. [2020-08-18 11:27:26,234 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 11:27:26,234 INFO L93 Difference]: Finished difference Result 112 states and 118 transitions. [2020-08-18 11:27:26,235 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-18 11:27:26,235 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 82 [2020-08-18 11:27:26,235 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 11:27:26,236 INFO L225 Difference]: With dead ends: 112 [2020-08-18 11:27:26,236 INFO L226 Difference]: Without dead ends: 90 [2020-08-18 11:27:26,237 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=541, Invalid=791, Unknown=0, NotChecked=0, Total=1332 [2020-08-18 11:27:26,238 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2020-08-18 11:27:26,242 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 89. [2020-08-18 11:27:26,242 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2020-08-18 11:27:26,242 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 92 transitions. [2020-08-18 11:27:26,242 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 92 transitions. Word has length 82 [2020-08-18 11:27:26,243 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 11:27:26,243 INFO L479 AbstractCegarLoop]: Abstraction has 89 states and 92 transitions. [2020-08-18 11:27:26,243 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-18 11:27:26,243 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 92 transitions. [2020-08-18 11:27:26,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2020-08-18 11:27:26,244 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 11:27:26,244 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 11:27:26,244 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-18 11:27:26,244 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 11:27:26,244 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 11:27:26,244 INFO L82 PathProgramCache]: Analyzing trace with hash -1163551230, now seen corresponding path program 21 times [2020-08-18 11:27:26,245 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 11:27:26,245 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2139400982] [2020-08-18 11:27:26,245 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 11:27:26,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:26,298 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 11:27:26,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:26,308 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 11:27:26,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:27,817 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 11:27:27,817 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2139400982] [2020-08-18 11:27:27,817 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 11:27:27,818 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-18 11:27:27,818 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [842632045] [2020-08-18 11:27:27,818 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-18 11:27:27,818 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 11:27:27,818 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-18 11:27:27,819 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=502, Invalid=688, Unknown=0, NotChecked=0, Total=1190 [2020-08-18 11:27:27,819 INFO L87 Difference]: Start difference. First operand 89 states and 92 transitions. Second operand 35 states. [2020-08-18 11:27:28,231 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 11:27:28,231 INFO L93 Difference]: Finished difference Result 114 states and 120 transitions. [2020-08-18 11:27:28,232 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-18 11:27:28,232 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 84 [2020-08-18 11:27:28,232 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 11:27:28,233 INFO L225 Difference]: With dead ends: 114 [2020-08-18 11:27:28,233 INFO L226 Difference]: Without dead ends: 92 [2020-08-18 11:27:28,234 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=574, Invalid=832, Unknown=0, NotChecked=0, Total=1406 [2020-08-18 11:27:28,235 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2020-08-18 11:27:28,238 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 91. [2020-08-18 11:27:28,238 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2020-08-18 11:27:28,239 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 94 transitions. [2020-08-18 11:27:28,239 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 94 transitions. Word has length 84 [2020-08-18 11:27:28,239 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 11:27:28,239 INFO L479 AbstractCegarLoop]: Abstraction has 91 states and 94 transitions. [2020-08-18 11:27:28,239 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-18 11:27:28,239 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 94 transitions. [2020-08-18 11:27:28,240 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2020-08-18 11:27:28,240 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 11:27:28,240 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 11:27:28,240 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-18 11:27:28,241 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 11:27:28,241 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 11:27:28,241 INFO L82 PathProgramCache]: Analyzing trace with hash 975518148, now seen corresponding path program 22 times [2020-08-18 11:27:28,241 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 11:27:28,241 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1288199345] [2020-08-18 11:27:28,241 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 11:27:28,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:28,295 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 11:27:28,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:28,305 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 11:27:28,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:29,925 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 11:27:29,925 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1288199345] [2020-08-18 11:27:29,926 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 11:27:29,926 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-18 11:27:29,926 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1323684715] [2020-08-18 11:27:29,926 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-18 11:27:29,926 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 11:27:29,927 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-18 11:27:29,927 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=534, Invalid=726, Unknown=0, NotChecked=0, Total=1260 [2020-08-18 11:27:29,927 INFO L87 Difference]: Start difference. First operand 91 states and 94 transitions. Second operand 36 states. [2020-08-18 11:27:30,259 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 11:27:30,259 INFO L93 Difference]: Finished difference Result 116 states and 122 transitions. [2020-08-18 11:27:30,260 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-18 11:27:30,260 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 86 [2020-08-18 11:27:30,261 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 11:27:30,261 INFO L225 Difference]: With dead ends: 116 [2020-08-18 11:27:30,262 INFO L226 Difference]: Without dead ends: 94 [2020-08-18 11:27:30,262 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=608, Invalid=874, Unknown=0, NotChecked=0, Total=1482 [2020-08-18 11:27:30,263 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2020-08-18 11:27:30,266 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 93. [2020-08-18 11:27:30,266 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2020-08-18 11:27:30,267 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 96 transitions. [2020-08-18 11:27:30,267 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 96 transitions. Word has length 86 [2020-08-18 11:27:30,267 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 11:27:30,268 INFO L479 AbstractCegarLoop]: Abstraction has 93 states and 96 transitions. [2020-08-18 11:27:30,268 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-18 11:27:30,268 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 96 transitions. [2020-08-18 11:27:30,268 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2020-08-18 11:27:30,268 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 11:27:30,269 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 11:27:30,269 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-18 11:27:30,269 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 11:27:30,269 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 11:27:30,269 INFO L82 PathProgramCache]: Analyzing trace with hash -668144378, now seen corresponding path program 23 times [2020-08-18 11:27:30,269 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 11:27:30,269 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [924237930] [2020-08-18 11:27:30,270 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 11:27:30,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:30,325 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 11:27:30,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:30,336 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 11:27:30,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:32,023 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 11:27:32,023 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [924237930] [2020-08-18 11:27:32,023 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 11:27:32,024 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-18 11:27:32,024 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1511186309] [2020-08-18 11:27:32,024 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-18 11:27:32,024 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 11:27:32,024 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-18 11:27:32,025 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=567, Invalid=765, Unknown=0, NotChecked=0, Total=1332 [2020-08-18 11:27:32,025 INFO L87 Difference]: Start difference. First operand 93 states and 96 transitions. Second operand 37 states. [2020-08-18 11:27:32,479 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 11:27:32,479 INFO L93 Difference]: Finished difference Result 118 states and 124 transitions. [2020-08-18 11:27:32,480 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-18 11:27:32,480 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 88 [2020-08-18 11:27:32,480 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 11:27:32,481 INFO L225 Difference]: With dead ends: 118 [2020-08-18 11:27:32,481 INFO L226 Difference]: Without dead ends: 96 [2020-08-18 11:27:32,482 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=643, Invalid=917, Unknown=0, NotChecked=0, Total=1560 [2020-08-18 11:27:32,483 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2020-08-18 11:27:32,486 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 95. [2020-08-18 11:27:32,486 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2020-08-18 11:27:32,487 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 98 transitions. [2020-08-18 11:27:32,487 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 98 transitions. Word has length 88 [2020-08-18 11:27:32,487 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 11:27:32,488 INFO L479 AbstractCegarLoop]: Abstraction has 95 states and 98 transitions. [2020-08-18 11:27:32,488 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-18 11:27:32,488 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 98 transitions. [2020-08-18 11:27:32,488 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2020-08-18 11:27:32,488 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 11:27:32,488 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 11:27:32,488 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-18 11:27:32,489 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 11:27:32,489 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 11:27:32,489 INFO L82 PathProgramCache]: Analyzing trace with hash 320133064, now seen corresponding path program 24 times [2020-08-18 11:27:32,489 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 11:27:32,489 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1455130884] [2020-08-18 11:27:32,489 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 11:27:32,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:32,543 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 11:27:32,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:32,556 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 11:27:32,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:34,342 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 11:27:34,343 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1455130884] [2020-08-18 11:27:34,343 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 11:27:34,343 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-18 11:27:34,343 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1794206137] [2020-08-18 11:27:34,343 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-18 11:27:34,343 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 11:27:34,344 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-18 11:27:34,344 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=601, Invalid=805, Unknown=0, NotChecked=0, Total=1406 [2020-08-18 11:27:34,344 INFO L87 Difference]: Start difference. First operand 95 states and 98 transitions. Second operand 38 states. [2020-08-18 11:27:34,739 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 11:27:34,739 INFO L93 Difference]: Finished difference Result 120 states and 126 transitions. [2020-08-18 11:27:34,739 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-18 11:27:34,740 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 90 [2020-08-18 11:27:34,740 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 11:27:34,741 INFO L225 Difference]: With dead ends: 120 [2020-08-18 11:27:34,741 INFO L226 Difference]: Without dead ends: 98 [2020-08-18 11:27:34,742 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=679, Invalid=961, Unknown=0, NotChecked=0, Total=1640 [2020-08-18 11:27:34,743 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-08-18 11:27:34,746 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 97. [2020-08-18 11:27:34,747 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2020-08-18 11:27:34,747 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 100 transitions. [2020-08-18 11:27:34,747 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 100 transitions. Word has length 90 [2020-08-18 11:27:34,748 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 11:27:34,748 INFO L479 AbstractCegarLoop]: Abstraction has 97 states and 100 transitions. [2020-08-18 11:27:34,748 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-18 11:27:34,748 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 100 transitions. [2020-08-18 11:27:34,748 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2020-08-18 11:27:34,749 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 11:27:34,749 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 11:27:34,749 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-18 11:27:34,749 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 11:27:34,749 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 11:27:34,750 INFO L82 PathProgramCache]: Analyzing trace with hash 866982410, now seen corresponding path program 25 times [2020-08-18 11:27:34,750 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 11:27:34,750 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [346852563] [2020-08-18 11:27:34,750 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 11:27:34,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:34,808 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 11:27:34,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:34,817 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 11:27:34,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:36,692 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 11:27:36,692 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [346852563] [2020-08-18 11:27:36,692 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 11:27:36,692 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-18 11:27:36,693 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [542526689] [2020-08-18 11:27:36,693 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-18 11:27:36,693 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 11:27:36,694 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-18 11:27:36,694 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=636, Invalid=846, Unknown=0, NotChecked=0, Total=1482 [2020-08-18 11:27:36,694 INFO L87 Difference]: Start difference. First operand 97 states and 100 transitions. Second operand 39 states. [2020-08-18 11:27:37,022 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 11:27:37,023 INFO L93 Difference]: Finished difference Result 122 states and 128 transitions. [2020-08-18 11:27:37,023 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-18 11:27:37,023 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 92 [2020-08-18 11:27:37,024 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 11:27:37,024 INFO L225 Difference]: With dead ends: 122 [2020-08-18 11:27:37,025 INFO L226 Difference]: Without dead ends: 100 [2020-08-18 11:27:37,026 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=716, Invalid=1006, Unknown=0, NotChecked=0, Total=1722 [2020-08-18 11:27:37,026 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2020-08-18 11:27:37,031 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 99. [2020-08-18 11:27:37,031 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2020-08-18 11:27:37,031 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 102 transitions. [2020-08-18 11:27:37,032 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 102 transitions. Word has length 92 [2020-08-18 11:27:37,032 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 11:27:37,032 INFO L479 AbstractCegarLoop]: Abstraction has 99 states and 102 transitions. [2020-08-18 11:27:37,032 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-18 11:27:37,032 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 102 transitions. [2020-08-18 11:27:37,033 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2020-08-18 11:27:37,033 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 11:27:37,033 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 11:27:37,033 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-18 11:27:37,033 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 11:27:37,034 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 11:27:37,034 INFO L82 PathProgramCache]: Analyzing trace with hash -1891773492, now seen corresponding path program 26 times [2020-08-18 11:27:37,034 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 11:27:37,034 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [85311105] [2020-08-18 11:27:37,034 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 11:27:37,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:37,091 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 11:27:37,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:37,101 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 11:27:37,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:39,084 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 11:27:39,084 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [85311105] [2020-08-18 11:27:39,085 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 11:27:39,085 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-18 11:27:39,085 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [264869654] [2020-08-18 11:27:39,085 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-18 11:27:39,085 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 11:27:39,085 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-18 11:27:39,086 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=672, Invalid=888, Unknown=0, NotChecked=0, Total=1560 [2020-08-18 11:27:39,086 INFO L87 Difference]: Start difference. First operand 99 states and 102 transitions. Second operand 40 states. [2020-08-18 11:27:39,376 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 11:27:39,376 INFO L93 Difference]: Finished difference Result 124 states and 130 transitions. [2020-08-18 11:27:39,377 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-18 11:27:39,377 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 94 [2020-08-18 11:27:39,377 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 11:27:39,378 INFO L225 Difference]: With dead ends: 124 [2020-08-18 11:27:39,378 INFO L226 Difference]: Without dead ends: 102 [2020-08-18 11:27:39,380 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=754, Invalid=1052, Unknown=0, NotChecked=0, Total=1806 [2020-08-18 11:27:39,380 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2020-08-18 11:27:39,383 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 101. [2020-08-18 11:27:39,383 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2020-08-18 11:27:39,384 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 104 transitions. [2020-08-18 11:27:39,384 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 104 transitions. Word has length 94 [2020-08-18 11:27:39,384 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 11:27:39,384 INFO L479 AbstractCegarLoop]: Abstraction has 101 states and 104 transitions. [2020-08-18 11:27:39,384 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-18 11:27:39,385 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 104 transitions. [2020-08-18 11:27:39,385 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-08-18 11:27:39,385 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 11:27:39,386 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 11:27:39,386 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-18 11:27:39,386 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 11:27:39,386 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 11:27:39,386 INFO L82 PathProgramCache]: Analyzing trace with hash 1233593614, now seen corresponding path program 27 times [2020-08-18 11:27:39,386 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 11:27:39,387 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [939936971] [2020-08-18 11:27:39,387 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 11:27:39,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:39,442 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 11:27:39,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:39,451 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 11:27:39,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:41,515 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 11:27:41,515 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [939936971] [2020-08-18 11:27:41,515 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 11:27:41,515 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-18 11:27:41,516 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1812042408] [2020-08-18 11:27:41,516 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-18 11:27:41,516 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 11:27:41,516 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-18 11:27:41,517 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=709, Invalid=931, Unknown=0, NotChecked=0, Total=1640 [2020-08-18 11:27:41,517 INFO L87 Difference]: Start difference. First operand 101 states and 104 transitions. Second operand 41 states. [2020-08-18 11:27:41,835 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 11:27:41,835 INFO L93 Difference]: Finished difference Result 126 states and 132 transitions. [2020-08-18 11:27:41,836 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-18 11:27:41,836 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 96 [2020-08-18 11:27:41,836 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 11:27:41,837 INFO L225 Difference]: With dead ends: 126 [2020-08-18 11:27:41,837 INFO L226 Difference]: Without dead ends: 104 [2020-08-18 11:27:41,838 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=793, Invalid=1099, Unknown=0, NotChecked=0, Total=1892 [2020-08-18 11:27:41,839 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2020-08-18 11:27:41,841 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 103. [2020-08-18 11:27:41,841 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2020-08-18 11:27:41,842 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 106 transitions. [2020-08-18 11:27:41,842 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 106 transitions. Word has length 96 [2020-08-18 11:27:41,842 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 11:27:41,842 INFO L479 AbstractCegarLoop]: Abstraction has 103 states and 106 transitions. [2020-08-18 11:27:41,842 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-18 11:27:41,842 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 106 transitions. [2020-08-18 11:27:41,843 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2020-08-18 11:27:41,843 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 11:27:41,843 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 11:27:41,843 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-18 11:27:41,843 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 11:27:41,843 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 11:27:41,844 INFO L82 PathProgramCache]: Analyzing trace with hash -1765724720, now seen corresponding path program 28 times [2020-08-18 11:27:41,844 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 11:27:41,844 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1462987897] [2020-08-18 11:27:41,844 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 11:27:41,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:41,900 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 11:27:41,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:41,911 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 11:27:41,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:44,055 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 11:27:44,055 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1462987897] [2020-08-18 11:27:44,055 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 11:27:44,055 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-18 11:27:44,055 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [17954656] [2020-08-18 11:27:44,055 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-18 11:27:44,056 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 11:27:44,056 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-18 11:27:44,056 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=747, Invalid=975, Unknown=0, NotChecked=0, Total=1722 [2020-08-18 11:27:44,057 INFO L87 Difference]: Start difference. First operand 103 states and 106 transitions. Second operand 42 states. [2020-08-18 11:27:44,463 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 11:27:44,464 INFO L93 Difference]: Finished difference Result 128 states and 134 transitions. [2020-08-18 11:27:44,464 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-18 11:27:44,464 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 98 [2020-08-18 11:27:44,465 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 11:27:44,465 INFO L225 Difference]: With dead ends: 128 [2020-08-18 11:27:44,466 INFO L226 Difference]: Without dead ends: 106 [2020-08-18 11:27:44,467 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=833, Invalid=1147, Unknown=0, NotChecked=0, Total=1980 [2020-08-18 11:27:44,467 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2020-08-18 11:27:44,473 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 105. [2020-08-18 11:27:44,473 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2020-08-18 11:27:44,473 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 108 transitions. [2020-08-18 11:27:44,473 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 108 transitions. Word has length 98 [2020-08-18 11:27:44,474 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 11:27:44,474 INFO L479 AbstractCegarLoop]: Abstraction has 105 states and 108 transitions. [2020-08-18 11:27:44,474 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-18 11:27:44,474 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 108 transitions. [2020-08-18 11:27:44,475 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2020-08-18 11:27:44,475 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 11:27:44,475 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 11:27:44,475 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-18 11:27:44,475 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 11:27:44,475 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 11:27:44,476 INFO L82 PathProgramCache]: Analyzing trace with hash 2107379218, now seen corresponding path program 29 times [2020-08-18 11:27:44,476 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 11:27:44,476 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1474418036] [2020-08-18 11:27:44,476 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 11:27:44,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:44,556 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 11:27:44,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:44,567 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 11:27:44,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:46,851 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 11:27:46,852 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1474418036] [2020-08-18 11:27:46,852 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 11:27:46,852 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-18 11:27:46,852 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1907292539] [2020-08-18 11:27:46,852 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-18 11:27:46,853 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 11:27:46,853 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-18 11:27:46,854 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=786, Invalid=1020, Unknown=0, NotChecked=0, Total=1806 [2020-08-18 11:27:46,854 INFO L87 Difference]: Start difference. First operand 105 states and 108 transitions. Second operand 43 states. [2020-08-18 11:27:47,410 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 11:27:47,410 INFO L93 Difference]: Finished difference Result 130 states and 136 transitions. [2020-08-18 11:27:47,411 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-08-18 11:27:47,411 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 100 [2020-08-18 11:27:47,411 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 11:27:47,412 INFO L225 Difference]: With dead ends: 130 [2020-08-18 11:27:47,412 INFO L226 Difference]: Without dead ends: 108 [2020-08-18 11:27:47,413 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=874, Invalid=1196, Unknown=0, NotChecked=0, Total=2070 [2020-08-18 11:27:47,414 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-08-18 11:27:47,418 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 107. [2020-08-18 11:27:47,418 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2020-08-18 11:27:47,419 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 110 transitions. [2020-08-18 11:27:47,419 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 110 transitions. Word has length 100 [2020-08-18 11:27:47,419 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 11:27:47,420 INFO L479 AbstractCegarLoop]: Abstraction has 107 states and 110 transitions. [2020-08-18 11:27:47,420 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-18 11:27:47,420 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 110 transitions. [2020-08-18 11:27:47,420 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2020-08-18 11:27:47,420 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 11:27:47,421 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 11:27:47,421 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-08-18 11:27:47,421 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 11:27:47,421 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 11:27:47,421 INFO L82 PathProgramCache]: Analyzing trace with hash 423618004, now seen corresponding path program 30 times [2020-08-18 11:27:47,421 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 11:27:47,422 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [223710854] [2020-08-18 11:27:47,422 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 11:27:47,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:47,485 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 11:27:47,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:47,496 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 11:27:47,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:49,849 INFO L134 CoverageAnalysis]: Checked inductivity of 1449 backedges. 0 proven. 1444 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 11:27:49,849 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [223710854] [2020-08-18 11:27:49,849 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 11:27:49,849 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44] total 44 [2020-08-18 11:27:49,849 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1283699137] [2020-08-18 11:27:49,850 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-08-18 11:27:49,850 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 11:27:49,850 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-08-18 11:27:49,851 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=826, Invalid=1066, Unknown=0, NotChecked=0, Total=1892 [2020-08-18 11:27:49,851 INFO L87 Difference]: Start difference. First operand 107 states and 110 transitions. Second operand 44 states. [2020-08-18 11:27:50,197 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 11:27:50,198 INFO L93 Difference]: Finished difference Result 132 states and 138 transitions. [2020-08-18 11:27:50,198 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-08-18 11:27:50,198 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 102 [2020-08-18 11:27:50,199 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 11:27:50,200 INFO L225 Difference]: With dead ends: 132 [2020-08-18 11:27:50,200 INFO L226 Difference]: Without dead ends: 110 [2020-08-18 11:27:50,201 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=916, Invalid=1246, Unknown=0, NotChecked=0, Total=2162 [2020-08-18 11:27:50,202 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2020-08-18 11:27:50,205 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 109. [2020-08-18 11:27:50,206 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 109 states. [2020-08-18 11:27:50,206 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 112 transitions. [2020-08-18 11:27:50,206 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 112 transitions. Word has length 102 [2020-08-18 11:27:50,207 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 11:27:50,207 INFO L479 AbstractCegarLoop]: Abstraction has 109 states and 112 transitions. [2020-08-18 11:27:50,207 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-08-18 11:27:50,207 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 112 transitions. [2020-08-18 11:27:50,208 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2020-08-18 11:27:50,208 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 11:27:50,208 INFO L422 BasicCegarLoop]: trace histogram [39, 39, 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 11:27:50,208 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2020-08-18 11:27:50,208 INFO L427 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 11:27:50,208 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 11:27:50,209 INFO L82 PathProgramCache]: Analyzing trace with hash 1531761942, now seen corresponding path program 31 times [2020-08-18 11:27:50,209 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 11:27:50,209 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1709218302] [2020-08-18 11:27:50,209 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 11:27:50,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:50,273 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 11:27:50,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:50,283 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 11:27:50,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:52,740 INFO L134 CoverageAnalysis]: Checked inductivity of 1526 backedges. 0 proven. 1521 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 11:27:52,740 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1709218302] [2020-08-18 11:27:52,741 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 11:27:52,741 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45] total 45 [2020-08-18 11:27:52,741 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1076896056] [2020-08-18 11:27:52,741 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2020-08-18 11:27:52,741 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 11:27:52,742 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2020-08-18 11:27:52,742 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=867, Invalid=1113, Unknown=0, NotChecked=0, Total=1980 [2020-08-18 11:27:52,742 INFO L87 Difference]: Start difference. First operand 109 states and 112 transitions. Second operand 45 states. [2020-08-18 11:27:53,304 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 11:27:53,304 INFO L93 Difference]: Finished difference Result 134 states and 140 transitions. [2020-08-18 11:27:53,305 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2020-08-18 11:27:53,305 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 104 [2020-08-18 11:27:53,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 11:27:53,306 INFO L225 Difference]: With dead ends: 134 [2020-08-18 11:27:53,306 INFO L226 Difference]: Without dead ends: 112 [2020-08-18 11:27:53,307 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=959, Invalid=1297, Unknown=0, NotChecked=0, Total=2256 [2020-08-18 11:27:53,308 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2020-08-18 11:27:53,312 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 111. [2020-08-18 11:27:53,312 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 111 states. [2020-08-18 11:27:53,312 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 114 transitions. [2020-08-18 11:27:53,313 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 114 transitions. Word has length 104 [2020-08-18 11:27:53,313 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 11:27:53,313 INFO L479 AbstractCegarLoop]: Abstraction has 111 states and 114 transitions. [2020-08-18 11:27:53,313 INFO L480 AbstractCegarLoop]: Interpolant automaton has 45 states. [2020-08-18 11:27:53,313 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 114 transitions. [2020-08-18 11:27:53,314 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2020-08-18 11:27:53,314 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 11:27:53,314 INFO L422 BasicCegarLoop]: trace histogram [40, 40, 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 11:27:53,314 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2020-08-18 11:27:53,314 INFO L427 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 11:27:53,314 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 11:27:53,315 INFO L82 PathProgramCache]: Analyzing trace with hash 1306196952, now seen corresponding path program 32 times [2020-08-18 11:27:53,315 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 11:27:53,315 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [696664345] [2020-08-18 11:27:53,315 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 11:27:53,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:53,391 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 11:27:53,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:27:53,401 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 11:27:53,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat