/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5 --traceabstraction.additional.smt.options interpolation-heuristic=SMALLESTAMONGWIDE --traceabstraction.additional.smt.options tolerance=0.1 -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 [2020-08-19 03:41:15,291 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-19 03:41:15,294 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-19 03:41:15,334 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-19 03:41:15,334 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-19 03:41:15,343 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-19 03:41:15,346 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-19 03:41:15,349 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-19 03:41:15,352 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-19 03:41:15,355 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-19 03:41:15,356 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-19 03:41:15,357 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-19 03:41:15,357 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-19 03:41:15,358 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-19 03:41:15,359 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-19 03:41:15,360 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-19 03:41:15,361 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-19 03:41:15,362 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-19 03:41:15,363 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-19 03:41:15,365 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-19 03:41:15,366 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-19 03:41:15,367 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-19 03:41:15,368 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-19 03:41:15,369 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-19 03:41:15,371 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-19 03:41:15,379 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-19 03:41:15,380 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-19 03:41:15,380 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-19 03:41:15,381 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-19 03:41:15,404 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-19 03:41:15,405 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-19 03:41:15,406 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-19 03:41:15,406 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-19 03:41:15,406 INFO L138 SettingsManager]: * Use SBE=true [2020-08-19 03:41:15,407 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-19 03:41:15,407 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-19 03:41:15,407 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-19 03:41:15,407 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-19 03:41:15,408 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-19 03:41:15,408 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-19 03:41:15,408 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-19 03:41:15,408 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-19 03:41:15,408 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-19 03:41:15,409 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-19 03:41:15,409 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-19 03:41:15,409 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-19 03:41:15,409 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-19 03:41:15,409 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-19 03:41:15,410 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-19 03:41:15,410 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-19 03:41:15,410 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-19 03:41:15,410 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-19 03:41:15,411 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-19 03:41:15,411 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-19 03:41:15,411 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-19 03:41:15,411 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-19 03:41:15,411 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-19 03:41:15,412 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-19 03:41:15,412 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.1; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.1; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.1; [2020-08-19 03:41:15,722 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-19 03:41:15,734 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-19 03:41:15,737 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-19 03:41:15,739 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-19 03:41:15,739 INFO L275 PluginConnector]: CDTParser initialized [2020-08-19 03:41:15,740 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-industry-pattern/array_of_struct_ptr_flag_init.i [2020-08-19 03:41:15,817 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/13eedc48b/9af10d999b8f454199e7a8cc702b2312/FLAG62258f607 [2020-08-19 03:41:16,238 INFO L306 CDTParser]: Found 1 translation units. [2020-08-19 03:41:16,239 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/array-industry-pattern/array_of_struct_ptr_flag_init.i [2020-08-19 03:41:16,247 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/13eedc48b/9af10d999b8f454199e7a8cc702b2312/FLAG62258f607 [2020-08-19 03:41:16,608 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/13eedc48b/9af10d999b8f454199e7a8cc702b2312 [2020-08-19 03:41:16,618 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-19 03:41:16,620 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-19 03:41:16,621 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-19 03:41:16,622 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-19 03:41:16,626 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-19 03:41:16,627 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 03:41:16" (1/1) ... [2020-08-19 03:41:16,632 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5adf6174 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 03:41:16, skipping insertion in model container [2020-08-19 03:41:16,632 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 03:41:16" (1/1) ... [2020-08-19 03:41:16,641 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-19 03:41:16,666 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-19 03:41:16,904 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-19 03:41:16,911 INFO L203 MainTranslator]: Completed pre-run [2020-08-19 03:41:16,932 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-19 03:41:16,949 INFO L208 MainTranslator]: Completed translation [2020-08-19 03:41:16,949 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 03:41:16 WrapperNode [2020-08-19 03:41:16,950 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-19 03:41:16,950 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-19 03:41:16,951 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-19 03:41:16,951 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-19 03:41:17,056 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 03:41:16" (1/1) ... [2020-08-19 03:41:17,059 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 03:41:16" (1/1) ... [2020-08-19 03:41:17,069 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 03:41:16" (1/1) ... [2020-08-19 03:41:17,070 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 03:41:16" (1/1) ... [2020-08-19 03:41:17,090 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 03:41:16" (1/1) ... [2020-08-19 03:41:17,095 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 03:41:16" (1/1) ... [2020-08-19 03:41:17,096 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 03:41:16" (1/1) ... [2020-08-19 03:41:17,099 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-19 03:41:17,099 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-19 03:41:17,100 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-19 03:41:17,100 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-19 03:41:17,101 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 03:41:16" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-19 03:41:17,167 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-19 03:41:17,167 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-19 03:41:17,168 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-19 03:41:17,169 INFO L138 BoogieDeclarations]: Found implementation of procedure init [2020-08-19 03:41:17,169 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-19 03:41:17,169 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2020-08-19 03:41:17,171 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-19 03:41:17,171 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-19 03:41:17,171 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-08-19 03:41:17,172 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-08-19 03:41:17,172 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-08-19 03:41:17,173 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-19 03:41:17,173 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-19 03:41:17,173 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-08-19 03:41:17,173 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-19 03:41:17,174 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-19 03:41:17,174 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-19 03:41:17,452 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-19 03:41:17,453 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-08-19 03:41:17,458 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 03:41:17 BoogieIcfgContainer [2020-08-19 03:41:17,458 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-19 03:41:17,460 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-19 03:41:17,461 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-19 03:41:17,464 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-19 03:41:17,464 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.08 03:41:16" (1/3) ... [2020-08-19 03:41:17,465 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@11e353c1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 03:41:17, skipping insertion in model container [2020-08-19 03:41:17,465 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 03:41:16" (2/3) ... [2020-08-19 03:41:17,466 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@11e353c1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 03:41:17, skipping insertion in model container [2020-08-19 03:41:17,466 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 03:41:17" (3/3) ... [2020-08-19 03:41:17,467 INFO L109 eAbstractionObserver]: Analyzing ICFG array_of_struct_ptr_flag_init.i [2020-08-19 03:41:17,482 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-19 03:41:17,492 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-19 03:41:17,524 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-19 03:41:17,569 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-19 03:41:17,570 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-19 03:41:17,570 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-19 03:41:17,570 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-19 03:41:17,570 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-19 03:41:17,570 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-19 03:41:17,570 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-19 03:41:17,571 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-19 03:41:17,591 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-08-19 03:41:17,597 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-19 03:41:17,598 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:41:17,599 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:41:17,599 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:41:17,612 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:41:17,612 INFO L82 PathProgramCache]: Analyzing trace with hash -850547107, now seen corresponding path program 1 times [2020-08-19 03:41:17,621 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:41:17,621 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [539329730] [2020-08-19 03:41:17,622 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:41:17,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:17,810 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:41:17,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:17,836 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 03:41:17,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:17,850 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:41:17,851 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [539329730] [2020-08-19 03:41:17,853 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 03:41:17,854 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-19 03:41:17,855 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [250071429] [2020-08-19 03:41:17,860 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-19 03:41:17,861 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:41:17,874 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-19 03:41:17,875 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-19 03:41:17,878 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 4 states. [2020-08-19 03:41:18,019 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:41:18,019 INFO L93 Difference]: Finished difference Result 59 states and 76 transitions. [2020-08-19 03:41:18,020 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-19 03:41:18,021 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 20 [2020-08-19 03:41:18,022 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:41:18,032 INFO L225 Difference]: With dead ends: 59 [2020-08-19 03:41:18,033 INFO L226 Difference]: Without dead ends: 31 [2020-08-19 03:41:18,037 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-19 03:41:18,056 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-19 03:41:18,079 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 28. [2020-08-19 03:41:18,080 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-19 03:41:18,082 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 32 transitions. [2020-08-19 03:41:18,083 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 32 transitions. Word has length 20 [2020-08-19 03:41:18,084 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:41:18,084 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 32 transitions. [2020-08-19 03:41:18,084 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-19 03:41:18,084 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 32 transitions. [2020-08-19 03:41:18,085 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-19 03:41:18,086 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:41:18,086 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:41:18,086 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-19 03:41:18,086 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:41:18,087 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:41:18,087 INFO L82 PathProgramCache]: Analyzing trace with hash 1453375688, now seen corresponding path program 1 times [2020-08-19 03:41:18,088 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:41:18,088 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1624194560] [2020-08-19 03:41:18,088 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:41:18,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:18,162 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:41:18,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:18,183 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 03:41:18,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:18,266 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:41:18,266 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1624194560] [2020-08-19 03:41:18,266 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 03:41:18,267 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-08-19 03:41:18,267 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [669887622] [2020-08-19 03:41:18,268 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-19 03:41:18,269 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:41:18,269 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-19 03:41:18,270 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-08-19 03:41:18,270 INFO L87 Difference]: Start difference. First operand 28 states and 32 transitions. Second operand 6 states. [2020-08-19 03:41:18,479 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:41:18,479 INFO L93 Difference]: Finished difference Result 48 states and 56 transitions. [2020-08-19 03:41:18,480 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-19 03:41:18,480 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2020-08-19 03:41:18,481 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:41:18,482 INFO L225 Difference]: With dead ends: 48 [2020-08-19 03:41:18,482 INFO L226 Difference]: Without dead ends: 30 [2020-08-19 03:41:18,483 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2020-08-19 03:41:18,484 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-19 03:41:18,491 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2020-08-19 03:41:18,491 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-19 03:41:18,492 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2020-08-19 03:41:18,492 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 20 [2020-08-19 03:41:18,493 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:41:18,493 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2020-08-19 03:41:18,493 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-19 03:41:18,493 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2020-08-19 03:41:18,494 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-19 03:41:18,494 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:41:18,495 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:41:18,508 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-19 03:41:18,509 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:41:18,510 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:41:18,510 INFO L82 PathProgramCache]: Analyzing trace with hash -169907062, now seen corresponding path program 1 times [2020-08-19 03:41:18,511 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:41:18,511 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1611923829] [2020-08-19 03:41:18,512 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:41:18,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:18,596 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:41:18,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:18,617 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 03:41:18,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:18,714 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:41:18,714 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1611923829] [2020-08-19 03:41:18,715 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:41:18,715 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-19 03:41:18,715 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1138996141] [2020-08-19 03:41:18,716 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-19 03:41:18,716 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:41:18,716 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-19 03:41:18,717 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-08-19 03:41:18,717 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand 7 states. [2020-08-19 03:41:18,882 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:41:18,882 INFO L93 Difference]: Finished difference Result 50 states and 58 transitions. [2020-08-19 03:41:18,883 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-19 03:41:18,883 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 22 [2020-08-19 03:41:18,883 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:41:18,884 INFO L225 Difference]: With dead ends: 50 [2020-08-19 03:41:18,884 INFO L226 Difference]: Without dead ends: 32 [2020-08-19 03:41:18,885 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2020-08-19 03:41:18,886 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-19 03:41:18,891 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2020-08-19 03:41:18,891 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-19 03:41:18,892 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 35 transitions. [2020-08-19 03:41:18,892 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 35 transitions. Word has length 22 [2020-08-19 03:41:18,893 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:41:18,893 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 35 transitions. [2020-08-19 03:41:18,893 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-19 03:41:18,893 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 35 transitions. [2020-08-19 03:41:18,894 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-19 03:41:18,894 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:41:18,894 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:41:18,895 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-19 03:41:18,895 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:41:18,895 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:41:18,895 INFO L82 PathProgramCache]: Analyzing trace with hash -1071501364, now seen corresponding path program 2 times [2020-08-19 03:41:18,895 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:41:18,896 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1265727699] [2020-08-19 03:41:18,896 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:41:18,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:18,944 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:41:18,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:18,980 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 03:41:18,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:19,133 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:41:19,134 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1265727699] [2020-08-19 03:41:19,134 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:41:19,134 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-19 03:41:19,134 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [527483528] [2020-08-19 03:41:19,135 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-19 03:41:19,135 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:41:19,135 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-19 03:41:19,136 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2020-08-19 03:41:19,136 INFO L87 Difference]: Start difference. First operand 31 states and 35 transitions. Second operand 8 states. [2020-08-19 03:41:19,315 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:41:19,315 INFO L93 Difference]: Finished difference Result 52 states and 60 transitions. [2020-08-19 03:41:19,315 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-19 03:41:19,316 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 24 [2020-08-19 03:41:19,316 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:41:19,317 INFO L225 Difference]: With dead ends: 52 [2020-08-19 03:41:19,317 INFO L226 Difference]: Without dead ends: 34 [2020-08-19 03:41:19,318 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2020-08-19 03:41:19,318 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-19 03:41:19,323 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2020-08-19 03:41:19,324 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-19 03:41:19,325 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 37 transitions. [2020-08-19 03:41:19,325 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 37 transitions. Word has length 24 [2020-08-19 03:41:19,325 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:41:19,325 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 37 transitions. [2020-08-19 03:41:19,325 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-19 03:41:19,325 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 37 transitions. [2020-08-19 03:41:19,326 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-19 03:41:19,326 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:41:19,327 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:41:19,327 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-19 03:41:19,327 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:41:19,327 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:41:19,328 INFO L82 PathProgramCache]: Analyzing trace with hash 79768206, now seen corresponding path program 3 times [2020-08-19 03:41:19,328 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:41:19,328 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [258904993] [2020-08-19 03:41:19,328 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:41:19,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:19,389 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:41:19,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:19,410 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 03:41:19,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:19,625 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:41:19,625 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [258904993] [2020-08-19 03:41:19,626 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:41:19,626 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-19 03:41:19,626 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1733756531] [2020-08-19 03:41:19,627 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-19 03:41:19,627 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:41:19,627 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-19 03:41:19,628 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-19 03:41:19,628 INFO L87 Difference]: Start difference. First operand 33 states and 37 transitions. Second operand 9 states. [2020-08-19 03:41:19,836 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:41:19,837 INFO L93 Difference]: Finished difference Result 54 states and 62 transitions. [2020-08-19 03:41:19,837 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-19 03:41:19,837 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-08-19 03:41:19,838 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:41:19,838 INFO L225 Difference]: With dead ends: 54 [2020-08-19 03:41:19,838 INFO L226 Difference]: Without dead ends: 36 [2020-08-19 03:41:19,839 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=41, Invalid=91, Unknown=0, NotChecked=0, Total=132 [2020-08-19 03:41:19,840 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-19 03:41:19,844 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2020-08-19 03:41:19,844 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-19 03:41:19,845 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2020-08-19 03:41:19,845 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 26 [2020-08-19 03:41:19,845 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:41:19,846 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2020-08-19 03:41:19,846 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-19 03:41:19,846 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2020-08-19 03:41:19,847 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-19 03:41:19,847 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:41:19,847 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:41:19,847 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-19 03:41:19,847 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:41:19,848 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:41:19,848 INFO L82 PathProgramCache]: Analyzing trace with hash -1651737392, now seen corresponding path program 4 times [2020-08-19 03:41:19,848 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:41:19,848 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1162723700] [2020-08-19 03:41:19,849 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:41:19,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:19,884 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:41:19,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:19,897 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 03:41:19,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:20,082 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:41:20,083 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1162723700] [2020-08-19 03:41:20,083 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:41:20,083 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-19 03:41:20,084 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [81845834] [2020-08-19 03:41:20,084 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-19 03:41:20,084 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:41:20,085 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-19 03:41:20,085 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2020-08-19 03:41:20,085 INFO L87 Difference]: Start difference. First operand 35 states and 39 transitions. Second operand 10 states. [2020-08-19 03:41:20,275 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:41:20,276 INFO L93 Difference]: Finished difference Result 56 states and 64 transitions. [2020-08-19 03:41:20,276 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-19 03:41:20,276 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 28 [2020-08-19 03:41:20,277 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:41:20,277 INFO L225 Difference]: With dead ends: 56 [2020-08-19 03:41:20,278 INFO L226 Difference]: Without dead ends: 38 [2020-08-19 03:41:20,278 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=49, Invalid=107, Unknown=0, NotChecked=0, Total=156 [2020-08-19 03:41:20,279 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-19 03:41:20,283 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2020-08-19 03:41:20,283 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-19 03:41:20,284 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 41 transitions. [2020-08-19 03:41:20,284 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 41 transitions. Word has length 28 [2020-08-19 03:41:20,284 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:41:20,285 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 41 transitions. [2020-08-19 03:41:20,285 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-19 03:41:20,285 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 41 transitions. [2020-08-19 03:41:20,285 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-19 03:41:20,286 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:41:20,286 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:41:20,286 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-19 03:41:20,286 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:41:20,287 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:41:20,287 INFO L82 PathProgramCache]: Analyzing trace with hash 818693778, now seen corresponding path program 5 times [2020-08-19 03:41:20,287 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:41:20,287 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [290689591] [2020-08-19 03:41:20,288 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:41:20,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:20,320 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:41:20,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:20,333 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 03:41:20,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:20,577 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:41:20,578 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [290689591] [2020-08-19 03:41:20,578 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:41:20,579 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-19 03:41:20,579 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [261880119] [2020-08-19 03:41:20,579 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-19 03:41:20,579 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:41:20,580 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-19 03:41:20,580 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2020-08-19 03:41:20,581 INFO L87 Difference]: Start difference. First operand 37 states and 41 transitions. Second operand 11 states. [2020-08-19 03:41:20,776 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:41:20,777 INFO L93 Difference]: Finished difference Result 58 states and 66 transitions. [2020-08-19 03:41:20,777 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-19 03:41:20,777 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 30 [2020-08-19 03:41:20,778 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:41:20,778 INFO L225 Difference]: With dead ends: 58 [2020-08-19 03:41:20,778 INFO L226 Difference]: Without dead ends: 40 [2020-08-19 03:41:20,779 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=58, Invalid=124, Unknown=0, NotChecked=0, Total=182 [2020-08-19 03:41:20,780 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-19 03:41:20,784 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2020-08-19 03:41:20,784 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-19 03:41:20,785 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 43 transitions. [2020-08-19 03:41:20,785 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 43 transitions. Word has length 30 [2020-08-19 03:41:20,785 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:41:20,785 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 43 transitions. [2020-08-19 03:41:20,786 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-19 03:41:20,786 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 43 transitions. [2020-08-19 03:41:20,787 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-19 03:41:20,787 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:41:20,787 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:41:20,787 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-19 03:41:20,787 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:41:20,788 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:41:20,788 INFO L82 PathProgramCache]: Analyzing trace with hash -213866540, now seen corresponding path program 6 times [2020-08-19 03:41:20,788 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:41:20,788 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1452546750] [2020-08-19 03:41:20,788 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:41:20,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:20,822 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:41:20,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:20,834 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 03:41:20,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:21,100 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:41:21,100 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1452546750] [2020-08-19 03:41:21,101 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:41:21,101 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-19 03:41:21,101 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1651171673] [2020-08-19 03:41:21,101 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-19 03:41:21,102 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:41:21,102 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-19 03:41:21,102 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=90, Unknown=0, NotChecked=0, Total=132 [2020-08-19 03:41:21,102 INFO L87 Difference]: Start difference. First operand 39 states and 43 transitions. Second operand 12 states. [2020-08-19 03:41:21,303 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:41:21,303 INFO L93 Difference]: Finished difference Result 60 states and 68 transitions. [2020-08-19 03:41:21,304 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-19 03:41:21,304 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 32 [2020-08-19 03:41:21,304 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:41:21,305 INFO L225 Difference]: With dead ends: 60 [2020-08-19 03:41:21,305 INFO L226 Difference]: Without dead ends: 42 [2020-08-19 03:41:21,306 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=68, Invalid=142, Unknown=0, NotChecked=0, Total=210 [2020-08-19 03:41:21,306 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-19 03:41:21,319 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2020-08-19 03:41:21,319 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-19 03:41:21,319 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 45 transitions. [2020-08-19 03:41:21,319 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 45 transitions. Word has length 32 [2020-08-19 03:41:21,320 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:41:21,320 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 45 transitions. [2020-08-19 03:41:21,320 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-19 03:41:21,320 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 45 transitions. [2020-08-19 03:41:21,321 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-19 03:41:21,321 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:41:21,321 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:41:21,321 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-19 03:41:21,321 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:41:21,321 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:41:21,321 INFO L82 PathProgramCache]: Analyzing trace with hash -366886762, now seen corresponding path program 7 times [2020-08-19 03:41:21,322 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:41:21,322 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [512693773] [2020-08-19 03:41:21,322 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:41:21,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:21,376 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:41:21,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:21,395 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 03:41:21,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:21,722 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:41:21,723 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [512693773] [2020-08-19 03:41:21,723 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:41:21,723 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-19 03:41:21,724 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [104689359] [2020-08-19 03:41:21,724 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-19 03:41:21,724 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:41:21,725 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-19 03:41:21,725 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=105, Unknown=0, NotChecked=0, Total=156 [2020-08-19 03:41:21,725 INFO L87 Difference]: Start difference. First operand 41 states and 45 transitions. Second operand 13 states. [2020-08-19 03:41:21,943 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:41:21,944 INFO L93 Difference]: Finished difference Result 62 states and 70 transitions. [2020-08-19 03:41:21,944 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-19 03:41:21,944 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 34 [2020-08-19 03:41:21,944 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:41:21,945 INFO L225 Difference]: With dead ends: 62 [2020-08-19 03:41:21,945 INFO L226 Difference]: Without dead ends: 44 [2020-08-19 03:41:21,947 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=79, Invalid=161, Unknown=0, NotChecked=0, Total=240 [2020-08-19 03:41:21,948 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-19 03:41:21,953 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2020-08-19 03:41:21,954 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-19 03:41:21,955 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 47 transitions. [2020-08-19 03:41:21,956 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 47 transitions. Word has length 34 [2020-08-19 03:41:21,956 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:41:21,956 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 47 transitions. [2020-08-19 03:41:21,956 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-19 03:41:21,956 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 47 transitions. [2020-08-19 03:41:21,960 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-19 03:41:21,960 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:41:21,960 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:41:21,961 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-19 03:41:21,961 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:41:21,961 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:41:21,961 INFO L82 PathProgramCache]: Analyzing trace with hash -1390432040, now seen corresponding path program 8 times [2020-08-19 03:41:21,962 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:41:21,962 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [117647836] [2020-08-19 03:41:21,962 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:41:21,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:22,020 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:41:22,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:22,031 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 03:41:22,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:22,399 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:41:22,399 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [117647836] [2020-08-19 03:41:22,400 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:41:22,400 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-19 03:41:22,400 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [717154601] [2020-08-19 03:41:22,400 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-19 03:41:22,400 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:41:22,401 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-19 03:41:22,401 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2020-08-19 03:41:22,401 INFO L87 Difference]: Start difference. First operand 43 states and 47 transitions. Second operand 14 states. [2020-08-19 03:41:22,602 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:41:22,603 INFO L93 Difference]: Finished difference Result 64 states and 72 transitions. [2020-08-19 03:41:22,603 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-19 03:41:22,603 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 36 [2020-08-19 03:41:22,603 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:41:22,604 INFO L225 Difference]: With dead ends: 64 [2020-08-19 03:41:22,604 INFO L226 Difference]: Without dead ends: 46 [2020-08-19 03:41:22,605 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=91, Invalid=181, Unknown=0, NotChecked=0, Total=272 [2020-08-19 03:41:22,605 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-19 03:41:22,609 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2020-08-19 03:41:22,609 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-19 03:41:22,610 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 49 transitions. [2020-08-19 03:41:22,610 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 49 transitions. Word has length 36 [2020-08-19 03:41:22,610 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:41:22,610 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 49 transitions. [2020-08-19 03:41:22,611 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-19 03:41:22,611 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 49 transitions. [2020-08-19 03:41:22,611 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-19 03:41:22,611 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:41:22,612 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:41:22,612 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-19 03:41:22,612 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:41:22,612 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:41:22,612 INFO L82 PathProgramCache]: Analyzing trace with hash -1469933414, now seen corresponding path program 9 times [2020-08-19 03:41:22,613 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:41:22,613 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [246883383] [2020-08-19 03:41:22,613 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:41:22,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:22,653 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:41:22,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:22,666 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 03:41:22,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:22,678 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2020-08-19 03:41:22,679 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [246883383] [2020-08-19 03:41:22,679 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 03:41:22,679 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-19 03:41:22,679 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1838581183] [2020-08-19 03:41:22,680 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-19 03:41:22,680 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:41:22,680 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-19 03:41:22,681 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-19 03:41:22,681 INFO L87 Difference]: Start difference. First operand 45 states and 49 transitions. Second operand 5 states. [2020-08-19 03:41:22,769 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:41:22,770 INFO L93 Difference]: Finished difference Result 65 states and 74 transitions. [2020-08-19 03:41:22,770 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-19 03:41:22,770 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 38 [2020-08-19 03:41:22,771 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:41:22,773 INFO L225 Difference]: With dead ends: 65 [2020-08-19 03:41:22,774 INFO L226 Difference]: Without dead ends: 53 [2020-08-19 03:41:22,774 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-19 03:41:22,775 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-08-19 03:41:22,783 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 46. [2020-08-19 03:41:22,783 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-19 03:41:22,784 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 50 transitions. [2020-08-19 03:41:22,784 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 50 transitions. Word has length 38 [2020-08-19 03:41:22,784 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:41:22,784 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 50 transitions. [2020-08-19 03:41:22,785 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-19 03:41:22,785 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 50 transitions. [2020-08-19 03:41:22,785 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-19 03:41:22,785 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:41:22,786 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:41:22,786 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-19 03:41:22,786 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:41:22,786 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:41:22,786 INFO L82 PathProgramCache]: Analyzing trace with hash -1568016950, now seen corresponding path program 1 times [2020-08-19 03:41:22,787 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:41:22,787 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1131878418] [2020-08-19 03:41:22,787 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:41:22,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:22,830 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:41:22,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:22,842 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 03:41:22,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:22,854 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2020-08-19 03:41:22,854 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1131878418] [2020-08-19 03:41:22,855 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:41:22,855 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-19 03:41:22,855 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2031381808] [2020-08-19 03:41:22,855 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-19 03:41:22,856 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:41:22,856 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-19 03:41:22,856 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-08-19 03:41:22,856 INFO L87 Difference]: Start difference. First operand 46 states and 50 transitions. Second operand 6 states. [2020-08-19 03:41:22,961 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:41:22,961 INFO L93 Difference]: Finished difference Result 73 states and 85 transitions. [2020-08-19 03:41:22,962 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-19 03:41:22,962 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 41 [2020-08-19 03:41:22,962 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:41:22,963 INFO L225 Difference]: With dead ends: 73 [2020-08-19 03:41:22,963 INFO L226 Difference]: Without dead ends: 61 [2020-08-19 03:41:22,964 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-08-19 03:41:22,964 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-08-19 03:41:22,969 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 49. [2020-08-19 03:41:22,969 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-19 03:41:22,970 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 54 transitions. [2020-08-19 03:41:22,970 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 54 transitions. Word has length 41 [2020-08-19 03:41:22,970 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:41:22,971 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 54 transitions. [2020-08-19 03:41:22,971 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-19 03:41:22,971 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 54 transitions. [2020-08-19 03:41:22,972 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-19 03:41:22,972 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:41:22,972 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:41:22,972 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-19 03:41:22,972 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:41:22,973 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:41:22,973 INFO L82 PathProgramCache]: Analyzing trace with hash 1298090650, now seen corresponding path program 2 times [2020-08-19 03:41:22,973 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:41:22,973 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [764135387] [2020-08-19 03:41:22,973 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:41:22,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:23,012 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:41:23,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:23,025 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 03:41:23,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:23,038 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 83 trivial. 0 not checked. [2020-08-19 03:41:23,038 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [764135387] [2020-08-19 03:41:23,039 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 03:41:23,039 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-19 03:41:23,039 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [294784080] [2020-08-19 03:41:23,040 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-19 03:41:23,040 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:41:23,040 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-19 03:41:23,040 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-19 03:41:23,041 INFO L87 Difference]: Start difference. First operand 49 states and 54 transitions. Second operand 5 states. [2020-08-19 03:41:23,112 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:41:23,112 INFO L93 Difference]: Finished difference Result 69 states and 78 transitions. [2020-08-19 03:41:23,112 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-19 03:41:23,112 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 44 [2020-08-19 03:41:23,112 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:41:23,113 INFO L225 Difference]: With dead ends: 69 [2020-08-19 03:41:23,113 INFO L226 Difference]: Without dead ends: 49 [2020-08-19 03:41:23,114 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-19 03:41:23,114 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-19 03:41:23,121 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-19 03:41:23,122 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-19 03:41:23,122 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 52 transitions. [2020-08-19 03:41:23,122 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 52 transitions. Word has length 44 [2020-08-19 03:41:23,123 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:41:23,123 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 52 transitions. [2020-08-19 03:41:23,123 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-19 03:41:23,123 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 52 transitions. [2020-08-19 03:41:23,124 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-19 03:41:23,124 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:41:23,124 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:41:23,124 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-19 03:41:23,125 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:41:23,125 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:41:23,125 INFO L82 PathProgramCache]: Analyzing trace with hash 318257626, now seen corresponding path program 1 times [2020-08-19 03:41:23,125 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:41:23,126 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [548596843] [2020-08-19 03:41:23,126 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:41:23,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:23,158 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:41:23,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:23,170 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 03:41:23,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:23,559 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 03:41:23,560 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [548596843] [2020-08-19 03:41:23,560 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:41:23,560 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-19 03:41:23,560 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1686152318] [2020-08-19 03:41:23,561 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-19 03:41:23,561 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:41:23,561 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-19 03:41:23,562 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=138, Unknown=0, NotChecked=0, Total=210 [2020-08-19 03:41:23,562 INFO L87 Difference]: Start difference. First operand 49 states and 52 transitions. Second operand 15 states. [2020-08-19 03:41:23,794 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:41:23,795 INFO L93 Difference]: Finished difference Result 74 states and 80 transitions. [2020-08-19 03:41:23,795 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-19 03:41:23,795 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 44 [2020-08-19 03:41:23,796 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:41:23,796 INFO L225 Difference]: With dead ends: 74 [2020-08-19 03:41:23,796 INFO L226 Difference]: Without dead ends: 52 [2020-08-19 03:41:23,797 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=104, Invalid=202, Unknown=0, NotChecked=0, Total=306 [2020-08-19 03:41:23,797 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-19 03:41:23,801 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2020-08-19 03:41:23,802 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-19 03:41:23,802 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 54 transitions. [2020-08-19 03:41:23,802 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 54 transitions. Word has length 44 [2020-08-19 03:41:23,803 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:41:23,803 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 54 transitions. [2020-08-19 03:41:23,803 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-19 03:41:23,803 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 54 transitions. [2020-08-19 03:41:23,804 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-19 03:41:23,804 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:41:23,804 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:41:23,804 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-19 03:41:23,804 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:41:23,805 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:41:23,805 INFO L82 PathProgramCache]: Analyzing trace with hash -935313508, now seen corresponding path program 2 times [2020-08-19 03:41:23,805 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:41:23,805 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1839571168] [2020-08-19 03:41:23,805 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:41:23,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:23,849 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:41:23,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:23,867 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 03:41:23,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:24,353 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 03:41:24,353 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1839571168] [2020-08-19 03:41:24,354 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:41:24,354 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-19 03:41:24,354 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [236305970] [2020-08-19 03:41:24,354 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-19 03:41:24,355 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:41:24,355 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-19 03:41:24,355 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=156, Unknown=0, NotChecked=0, Total=240 [2020-08-19 03:41:24,355 INFO L87 Difference]: Start difference. First operand 51 states and 54 transitions. Second operand 16 states. [2020-08-19 03:41:24,615 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:41:24,615 INFO L93 Difference]: Finished difference Result 76 states and 82 transitions. [2020-08-19 03:41:24,616 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-19 03:41:24,616 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 46 [2020-08-19 03:41:24,616 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:41:24,616 INFO L225 Difference]: With dead ends: 76 [2020-08-19 03:41:24,617 INFO L226 Difference]: Without dead ends: 54 [2020-08-19 03:41:24,618 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 [2020-08-19 03:41:24,618 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-19 03:41:24,623 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2020-08-19 03:41:24,623 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-19 03:41:24,624 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 56 transitions. [2020-08-19 03:41:24,624 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 56 transitions. Word has length 46 [2020-08-19 03:41:24,624 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:41:24,624 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 56 transitions. [2020-08-19 03:41:24,624 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-19 03:41:24,624 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 56 transitions. [2020-08-19 03:41:24,625 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-19 03:41:24,625 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:41:24,625 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:41:24,626 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-19 03:41:24,626 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:41:24,626 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:41:24,626 INFO L82 PathProgramCache]: Analyzing trace with hash 1268636894, now seen corresponding path program 3 times [2020-08-19 03:41:24,626 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:41:24,627 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [210517005] [2020-08-19 03:41:24,627 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:41:24,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:24,675 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:41:24,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:24,685 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 03:41:24,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:25,143 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 03:41:25,144 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [210517005] [2020-08-19 03:41:25,144 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:41:25,144 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-19 03:41:25,145 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [949248929] [2020-08-19 03:41:25,145 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-19 03:41:25,145 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:41:25,146 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-19 03:41:25,146 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=175, Unknown=0, NotChecked=0, Total=272 [2020-08-19 03:41:25,146 INFO L87 Difference]: Start difference. First operand 53 states and 56 transitions. Second operand 17 states. [2020-08-19 03:41:25,403 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:41:25,403 INFO L93 Difference]: Finished difference Result 78 states and 84 transitions. [2020-08-19 03:41:25,403 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-19 03:41:25,403 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 48 [2020-08-19 03:41:25,404 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:41:25,404 INFO L225 Difference]: With dead ends: 78 [2020-08-19 03:41:25,404 INFO L226 Difference]: Without dead ends: 56 [2020-08-19 03:41:25,405 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 [2020-08-19 03:41:25,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-08-19 03:41:25,411 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2020-08-19 03:41:25,411 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-19 03:41:25,411 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 58 transitions. [2020-08-19 03:41:25,412 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 58 transitions. Word has length 48 [2020-08-19 03:41:25,412 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:41:25,412 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 58 transitions. [2020-08-19 03:41:25,412 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-19 03:41:25,412 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 58 transitions. [2020-08-19 03:41:25,413 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-19 03:41:25,413 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:41:25,413 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:41:25,413 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-19 03:41:25,413 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:41:25,414 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:41:25,414 INFO L82 PathProgramCache]: Analyzing trace with hash 1846096288, now seen corresponding path program 4 times [2020-08-19 03:41:25,414 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:41:25,414 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1144664893] [2020-08-19 03:41:25,415 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:41:25,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:25,449 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:41:25,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:25,458 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 03:41:25,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:25,987 INFO L134 CoverageAnalysis]: Checked inductivity of 149 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 03:41:25,988 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1144664893] [2020-08-19 03:41:25,988 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:41:25,988 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-19 03:41:25,988 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [184712224] [2020-08-19 03:41:25,989 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-19 03:41:25,990 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:41:25,990 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-19 03:41:25,990 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=195, Unknown=0, NotChecked=0, Total=306 [2020-08-19 03:41:25,990 INFO L87 Difference]: Start difference. First operand 55 states and 58 transitions. Second operand 18 states. [2020-08-19 03:41:26,233 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:41:26,234 INFO L93 Difference]: Finished difference Result 80 states and 86 transitions. [2020-08-19 03:41:26,234 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-19 03:41:26,234 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 50 [2020-08-19 03:41:26,235 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:41:26,235 INFO L225 Difference]: With dead ends: 80 [2020-08-19 03:41:26,236 INFO L226 Difference]: Without dead ends: 58 [2020-08-19 03:41:26,237 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=149, Invalid=271, Unknown=0, NotChecked=0, Total=420 [2020-08-19 03:41:26,237 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-19 03:41:26,241 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2020-08-19 03:41:26,241 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-19 03:41:26,241 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 60 transitions. [2020-08-19 03:41:26,241 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 60 transitions. Word has length 50 [2020-08-19 03:41:26,242 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:41:26,242 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 60 transitions. [2020-08-19 03:41:26,242 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-19 03:41:26,242 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 60 transitions. [2020-08-19 03:41:26,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-19 03:41:26,243 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:41:26,243 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:41:26,243 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-19 03:41:26,243 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:41:26,243 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:41:26,244 INFO L82 PathProgramCache]: Analyzing trace with hash -1561174558, now seen corresponding path program 5 times [2020-08-19 03:41:26,244 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:41:26,244 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2040286083] [2020-08-19 03:41:26,244 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:41:26,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:26,297 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:41:26,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:26,316 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 03:41:26,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:26,954 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 03:41:26,955 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2040286083] [2020-08-19 03:41:26,955 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:41:26,955 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-19 03:41:26,955 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1783581907] [2020-08-19 03:41:26,956 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-19 03:41:26,956 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:41:26,956 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-19 03:41:26,957 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=216, Unknown=0, NotChecked=0, Total=342 [2020-08-19 03:41:26,957 INFO L87 Difference]: Start difference. First operand 57 states and 60 transitions. Second operand 19 states. [2020-08-19 03:41:27,213 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:41:27,213 INFO L93 Difference]: Finished difference Result 82 states and 88 transitions. [2020-08-19 03:41:27,214 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-19 03:41:27,214 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 52 [2020-08-19 03:41:27,214 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:41:27,215 INFO L225 Difference]: With dead ends: 82 [2020-08-19 03:41:27,215 INFO L226 Difference]: Without dead ends: 60 [2020-08-19 03:41:27,216 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=166, Invalid=296, Unknown=0, NotChecked=0, Total=462 [2020-08-19 03:41:27,217 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-08-19 03:41:27,220 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 59. [2020-08-19 03:41:27,221 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-08-19 03:41:27,221 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 62 transitions. [2020-08-19 03:41:27,221 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 62 transitions. Word has length 52 [2020-08-19 03:41:27,222 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:41:27,222 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 62 transitions. [2020-08-19 03:41:27,222 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-19 03:41:27,222 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 62 transitions. [2020-08-19 03:41:27,223 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-19 03:41:27,223 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:41:27,223 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:41:27,223 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-19 03:41:27,223 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:41:27,224 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:41:27,224 INFO L82 PathProgramCache]: Analyzing trace with hash 1111589284, now seen corresponding path program 6 times [2020-08-19 03:41:27,224 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:41:27,224 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2109930411] [2020-08-19 03:41:27,224 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:41:27,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:27,266 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:41:27,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:27,277 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 03:41:27,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:27,897 INFO L134 CoverageAnalysis]: Checked inductivity of 201 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 03:41:27,897 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2109930411] [2020-08-19 03:41:27,897 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:41:27,898 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-19 03:41:27,898 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [17299975] [2020-08-19 03:41:27,898 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-19 03:41:27,898 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:41:27,899 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-19 03:41:27,899 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=142, Invalid=238, Unknown=0, NotChecked=0, Total=380 [2020-08-19 03:41:27,899 INFO L87 Difference]: Start difference. First operand 59 states and 62 transitions. Second operand 20 states. [2020-08-19 03:41:28,199 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:41:28,200 INFO L93 Difference]: Finished difference Result 84 states and 90 transitions. [2020-08-19 03:41:28,200 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-19 03:41:28,200 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 54 [2020-08-19 03:41:28,201 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:41:28,202 INFO L225 Difference]: With dead ends: 84 [2020-08-19 03:41:28,202 INFO L226 Difference]: Without dead ends: 62 [2020-08-19 03:41:28,203 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=184, Invalid=322, Unknown=0, NotChecked=0, Total=506 [2020-08-19 03:41:28,203 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-08-19 03:41:28,207 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2020-08-19 03:41:28,207 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-08-19 03:41:28,207 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 64 transitions. [2020-08-19 03:41:28,208 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 64 transitions. Word has length 54 [2020-08-19 03:41:28,208 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:41:28,208 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 64 transitions. [2020-08-19 03:41:28,208 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-19 03:41:28,208 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 64 transitions. [2020-08-19 03:41:28,209 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-19 03:41:28,209 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:41:28,209 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:41:28,210 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-19 03:41:28,210 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:41:28,210 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:41:28,210 INFO L82 PathProgramCache]: Analyzing trace with hash 1247198438, now seen corresponding path program 7 times [2020-08-19 03:41:28,210 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:41:28,211 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [92155236] [2020-08-19 03:41:28,211 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:41:28,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:28,253 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:41:28,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:28,264 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 03:41:28,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:29,070 INFO L134 CoverageAnalysis]: Checked inductivity of 230 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 03:41:29,071 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [92155236] [2020-08-19 03:41:29,071 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:41:29,072 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-19 03:41:29,072 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [916481896] [2020-08-19 03:41:29,075 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-19 03:41:29,075 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:41:29,076 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-19 03:41:29,076 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=159, Invalid=261, Unknown=0, NotChecked=0, Total=420 [2020-08-19 03:41:29,077 INFO L87 Difference]: Start difference. First operand 61 states and 64 transitions. Second operand 21 states. [2020-08-19 03:41:29,355 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:41:29,355 INFO L93 Difference]: Finished difference Result 86 states and 92 transitions. [2020-08-19 03:41:29,355 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-19 03:41:29,356 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 56 [2020-08-19 03:41:29,356 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:41:29,357 INFO L225 Difference]: With dead ends: 86 [2020-08-19 03:41:29,357 INFO L226 Difference]: Without dead ends: 64 [2020-08-19 03:41:29,360 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=203, Invalid=349, Unknown=0, NotChecked=0, Total=552 [2020-08-19 03:41:29,360 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-08-19 03:41:29,366 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2020-08-19 03:41:29,367 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2020-08-19 03:41:29,367 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 66 transitions. [2020-08-19 03:41:29,368 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 66 transitions. Word has length 56 [2020-08-19 03:41:29,368 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:41:29,368 INFO L479 AbstractCegarLoop]: Abstraction has 63 states and 66 transitions. [2020-08-19 03:41:29,368 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-19 03:41:29,368 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 66 transitions. [2020-08-19 03:41:29,369 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-08-19 03:41:29,369 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:41:29,369 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:41:29,369 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-19 03:41:29,369 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:41:29,370 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:41:29,370 INFO L82 PathProgramCache]: Analyzing trace with hash -1576390744, now seen corresponding path program 8 times [2020-08-19 03:41:29,370 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:41:29,370 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1600865779] [2020-08-19 03:41:29,370 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:41:29,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:29,413 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:41:29,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:29,423 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 03:41:29,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:30,153 INFO L134 CoverageAnalysis]: Checked inductivity of 261 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 03:41:30,153 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1600865779] [2020-08-19 03:41:30,154 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:41:30,154 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-19 03:41:30,154 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1824655146] [2020-08-19 03:41:30,154 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-19 03:41:30,155 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:41:30,155 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-19 03:41:30,155 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=177, Invalid=285, Unknown=0, NotChecked=0, Total=462 [2020-08-19 03:41:30,155 INFO L87 Difference]: Start difference. First operand 63 states and 66 transitions. Second operand 22 states. [2020-08-19 03:41:30,477 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:41:30,477 INFO L93 Difference]: Finished difference Result 88 states and 94 transitions. [2020-08-19 03:41:30,478 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-19 03:41:30,478 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 58 [2020-08-19 03:41:30,479 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:41:30,479 INFO L225 Difference]: With dead ends: 88 [2020-08-19 03:41:30,479 INFO L226 Difference]: Without dead ends: 66 [2020-08-19 03:41:30,482 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=223, Invalid=377, Unknown=0, NotChecked=0, Total=600 [2020-08-19 03:41:30,482 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-08-19 03:41:30,486 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2020-08-19 03:41:30,486 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-08-19 03:41:30,487 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 68 transitions. [2020-08-19 03:41:30,487 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 68 transitions. Word has length 58 [2020-08-19 03:41:30,487 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:41:30,487 INFO L479 AbstractCegarLoop]: Abstraction has 65 states and 68 transitions. [2020-08-19 03:41:30,488 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-19 03:41:30,488 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 68 transitions. [2020-08-19 03:41:30,488 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2020-08-19 03:41:30,489 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:41:30,489 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:41:30,489 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-19 03:41:30,489 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:41:30,490 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:41:30,490 INFO L82 PathProgramCache]: Analyzing trace with hash -626263574, now seen corresponding path program 9 times [2020-08-19 03:41:30,490 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:41:30,490 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [505644013] [2020-08-19 03:41:30,490 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:41:30,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:30,539 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:41:30,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:30,550 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 03:41:30,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:31,334 INFO L134 CoverageAnalysis]: Checked inductivity of 294 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 03:41:31,334 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [505644013] [2020-08-19 03:41:31,334 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:41:31,334 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-19 03:41:31,335 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [134130357] [2020-08-19 03:41:31,335 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-19 03:41:31,335 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:41:31,335 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-19 03:41:31,336 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=196, Invalid=310, Unknown=0, NotChecked=0, Total=506 [2020-08-19 03:41:31,336 INFO L87 Difference]: Start difference. First operand 65 states and 68 transitions. Second operand 23 states. [2020-08-19 03:41:31,649 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:41:31,649 INFO L93 Difference]: Finished difference Result 90 states and 96 transitions. [2020-08-19 03:41:31,651 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-19 03:41:31,651 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 60 [2020-08-19 03:41:31,652 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:41:31,652 INFO L225 Difference]: With dead ends: 90 [2020-08-19 03:41:31,653 INFO L226 Difference]: Without dead ends: 68 [2020-08-19 03:41:31,653 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=244, Invalid=406, Unknown=0, NotChecked=0, Total=650 [2020-08-19 03:41:31,654 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-08-19 03:41:31,657 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 67. [2020-08-19 03:41:31,657 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-08-19 03:41:31,658 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 70 transitions. [2020-08-19 03:41:31,658 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 70 transitions. Word has length 60 [2020-08-19 03:41:31,658 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:41:31,658 INFO L479 AbstractCegarLoop]: Abstraction has 67 states and 70 transitions. [2020-08-19 03:41:31,659 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-19 03:41:31,659 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 70 transitions. [2020-08-19 03:41:31,659 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2020-08-19 03:41:31,659 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:41:31,659 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:41:31,660 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-19 03:41:31,660 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:41:31,660 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:41:31,660 INFO L82 PathProgramCache]: Analyzing trace with hash 1912880044, now seen corresponding path program 10 times [2020-08-19 03:41:31,660 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:41:31,661 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1338708624] [2020-08-19 03:41:31,661 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:41:31,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:31,704 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:41:31,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:31,715 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 03:41:31,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:32,577 INFO L134 CoverageAnalysis]: Checked inductivity of 329 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 03:41:32,577 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1338708624] [2020-08-19 03:41:32,578 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:41:32,578 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-19 03:41:32,578 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1263267180] [2020-08-19 03:41:32,578 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-19 03:41:32,579 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:41:32,579 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-19 03:41:32,579 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=216, Invalid=336, Unknown=0, NotChecked=0, Total=552 [2020-08-19 03:41:32,580 INFO L87 Difference]: Start difference. First operand 67 states and 70 transitions. Second operand 24 states. [2020-08-19 03:41:32,832 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:41:32,832 INFO L93 Difference]: Finished difference Result 92 states and 98 transitions. [2020-08-19 03:41:32,832 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-19 03:41:32,833 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 62 [2020-08-19 03:41:32,833 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:41:32,834 INFO L225 Difference]: With dead ends: 92 [2020-08-19 03:41:32,834 INFO L226 Difference]: Without dead ends: 70 [2020-08-19 03:41:32,835 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 [2020-08-19 03:41:32,836 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-08-19 03:41:32,838 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 69. [2020-08-19 03:41:32,838 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2020-08-19 03:41:32,839 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 72 transitions. [2020-08-19 03:41:32,839 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 72 transitions. Word has length 62 [2020-08-19 03:41:32,839 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:41:32,840 INFO L479 AbstractCegarLoop]: Abstraction has 69 states and 72 transitions. [2020-08-19 03:41:32,840 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-19 03:41:32,840 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 72 transitions. [2020-08-19 03:41:32,840 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2020-08-19 03:41:32,840 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:41:32,840 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:41:32,840 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-19 03:41:32,841 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:41:32,841 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:41:32,841 INFO L82 PathProgramCache]: Analyzing trace with hash -1806494482, now seen corresponding path program 11 times [2020-08-19 03:41:32,841 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:41:32,841 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1128847977] [2020-08-19 03:41:32,842 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:41:32,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:32,888 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:41:32,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:32,898 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 03:41:32,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:33,770 INFO L134 CoverageAnalysis]: Checked inductivity of 366 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 03:41:33,770 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1128847977] [2020-08-19 03:41:33,770 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:41:33,771 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-19 03:41:33,771 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1967833443] [2020-08-19 03:41:33,771 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-19 03:41:33,771 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:41:33,771 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-19 03:41:33,772 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=237, Invalid=363, Unknown=0, NotChecked=0, Total=600 [2020-08-19 03:41:33,772 INFO L87 Difference]: Start difference. First operand 69 states and 72 transitions. Second operand 25 states. [2020-08-19 03:41:34,102 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:41:34,103 INFO L93 Difference]: Finished difference Result 94 states and 100 transitions. [2020-08-19 03:41:34,103 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-19 03:41:34,103 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 64 [2020-08-19 03:41:34,104 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:41:34,104 INFO L225 Difference]: With dead ends: 94 [2020-08-19 03:41:34,105 INFO L226 Difference]: Without dead ends: 72 [2020-08-19 03:41:34,105 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=289, Invalid=467, Unknown=0, NotChecked=0, Total=756 [2020-08-19 03:41:34,106 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-08-19 03:41:34,110 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 71. [2020-08-19 03:41:34,110 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-08-19 03:41:34,111 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 74 transitions. [2020-08-19 03:41:34,111 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 74 transitions. Word has length 64 [2020-08-19 03:41:34,111 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:41:34,111 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 74 transitions. [2020-08-19 03:41:34,111 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-19 03:41:34,111 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 74 transitions. [2020-08-19 03:41:34,112 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2020-08-19 03:41:34,112 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:41:34,112 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:41:34,112 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-19 03:41:34,112 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:41:34,113 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:41:34,113 INFO L82 PathProgramCache]: Analyzing trace with hash 1582343600, now seen corresponding path program 12 times [2020-08-19 03:41:34,113 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:41:34,113 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1721947717] [2020-08-19 03:41:34,113 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:41:34,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:34,152 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:41:34,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:34,167 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 03:41:34,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:35,177 INFO L134 CoverageAnalysis]: Checked inductivity of 405 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 03:41:35,177 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1721947717] [2020-08-19 03:41:35,177 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:41:35,178 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-19 03:41:35,178 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [721801620] [2020-08-19 03:41:35,178 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-19 03:41:35,178 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:41:35,179 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-19 03:41:35,179 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=259, Invalid=391, Unknown=0, NotChecked=0, Total=650 [2020-08-19 03:41:35,179 INFO L87 Difference]: Start difference. First operand 71 states and 74 transitions. Second operand 26 states. [2020-08-19 03:41:35,540 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:41:35,540 INFO L93 Difference]: Finished difference Result 96 states and 102 transitions. [2020-08-19 03:41:35,541 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-19 03:41:35,541 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 66 [2020-08-19 03:41:35,541 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:41:35,542 INFO L225 Difference]: With dead ends: 96 [2020-08-19 03:41:35,542 INFO L226 Difference]: Without dead ends: 74 [2020-08-19 03:41:35,543 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=313, Invalid=499, Unknown=0, NotChecked=0, Total=812 [2020-08-19 03:41:35,543 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2020-08-19 03:41:35,547 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 73. [2020-08-19 03:41:35,547 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-08-19 03:41:35,548 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 76 transitions. [2020-08-19 03:41:35,548 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 76 transitions. Word has length 66 [2020-08-19 03:41:35,548 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:41:35,548 INFO L479 AbstractCegarLoop]: Abstraction has 73 states and 76 transitions. [2020-08-19 03:41:35,548 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-19 03:41:35,548 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 76 transitions. [2020-08-19 03:41:35,549 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-08-19 03:41:35,549 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:41:35,549 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:41:35,550 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-19 03:41:35,550 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:41:35,550 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:41:35,550 INFO L82 PathProgramCache]: Analyzing trace with hash -1624437262, now seen corresponding path program 13 times [2020-08-19 03:41:35,550 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:41:35,550 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2116988848] [2020-08-19 03:41:35,551 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:41:35,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:35,604 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:41:35,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:35,617 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 03:41:35,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:36,651 INFO L134 CoverageAnalysis]: Checked inductivity of 446 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 03:41:36,651 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2116988848] [2020-08-19 03:41:36,652 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:41:36,652 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-19 03:41:36,652 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1306014819] [2020-08-19 03:41:36,652 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-19 03:41:36,653 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:41:36,653 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-19 03:41:36,653 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=282, Invalid=420, Unknown=0, NotChecked=0, Total=702 [2020-08-19 03:41:36,653 INFO L87 Difference]: Start difference. First operand 73 states and 76 transitions. Second operand 27 states. [2020-08-19 03:41:36,896 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:41:36,896 INFO L93 Difference]: Finished difference Result 98 states and 104 transitions. [2020-08-19 03:41:36,896 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-19 03:41:36,896 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 68 [2020-08-19 03:41:36,897 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:41:36,897 INFO L225 Difference]: With dead ends: 98 [2020-08-19 03:41:36,897 INFO L226 Difference]: Without dead ends: 76 [2020-08-19 03:41:36,898 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=338, Invalid=532, Unknown=0, NotChecked=0, Total=870 [2020-08-19 03:41:36,899 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-08-19 03:41:36,903 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 75. [2020-08-19 03:41:36,903 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2020-08-19 03:41:36,904 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 78 transitions. [2020-08-19 03:41:36,904 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 78 transitions. Word has length 68 [2020-08-19 03:41:36,904 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:41:36,904 INFO L479 AbstractCegarLoop]: Abstraction has 75 states and 78 transitions. [2020-08-19 03:41:36,904 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-19 03:41:36,904 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 78 transitions. [2020-08-19 03:41:36,905 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2020-08-19 03:41:36,905 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:41:36,905 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:41:36,905 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-19 03:41:36,906 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:41:36,906 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:41:36,906 INFO L82 PathProgramCache]: Analyzing trace with hash 445672884, now seen corresponding path program 14 times [2020-08-19 03:41:36,906 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:41:36,906 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [353525464] [2020-08-19 03:41:36,906 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:41:36,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:36,958 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:41:36,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:36,969 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 03:41:36,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:38,092 INFO L134 CoverageAnalysis]: Checked inductivity of 489 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 03:41:38,093 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [353525464] [2020-08-19 03:41:38,093 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:41:38,093 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-19 03:41:38,093 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1212256745] [2020-08-19 03:41:38,094 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-19 03:41:38,094 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:41:38,094 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-19 03:41:38,095 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=306, Invalid=450, Unknown=0, NotChecked=0, Total=756 [2020-08-19 03:41:38,095 INFO L87 Difference]: Start difference. First operand 75 states and 78 transitions. Second operand 28 states. [2020-08-19 03:41:38,438 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:41:38,438 INFO L93 Difference]: Finished difference Result 100 states and 106 transitions. [2020-08-19 03:41:38,439 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-19 03:41:38,439 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 70 [2020-08-19 03:41:38,439 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:41:38,440 INFO L225 Difference]: With dead ends: 100 [2020-08-19 03:41:38,440 INFO L226 Difference]: Without dead ends: 78 [2020-08-19 03:41:38,441 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=364, Invalid=566, Unknown=0, NotChecked=0, Total=930 [2020-08-19 03:41:38,441 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-08-19 03:41:38,445 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 77. [2020-08-19 03:41:38,445 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2020-08-19 03:41:38,445 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 80 transitions. [2020-08-19 03:41:38,446 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 80 transitions. Word has length 70 [2020-08-19 03:41:38,446 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:41:38,446 INFO L479 AbstractCegarLoop]: Abstraction has 77 states and 80 transitions. [2020-08-19 03:41:38,446 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-19 03:41:38,446 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 80 transitions. [2020-08-19 03:41:38,447 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2020-08-19 03:41:38,447 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:41:38,447 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:41:38,447 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-19 03:41:38,447 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:41:38,448 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:41:38,448 INFO L82 PathProgramCache]: Analyzing trace with hash 1251665142, now seen corresponding path program 15 times [2020-08-19 03:41:38,448 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:41:38,448 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1275514041] [2020-08-19 03:41:38,448 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:41:38,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:38,497 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:41:38,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:38,507 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 03:41:38,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:39,754 INFO L134 CoverageAnalysis]: Checked inductivity of 534 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 03:41:39,755 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1275514041] [2020-08-19 03:41:39,755 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:41:39,755 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-19 03:41:39,755 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1065439846] [2020-08-19 03:41:39,756 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-19 03:41:39,757 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:41:39,757 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-19 03:41:39,758 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=331, Invalid=481, Unknown=0, NotChecked=0, Total=812 [2020-08-19 03:41:39,758 INFO L87 Difference]: Start difference. First operand 77 states and 80 transitions. Second operand 29 states. [2020-08-19 03:41:40,161 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:41:40,162 INFO L93 Difference]: Finished difference Result 102 states and 108 transitions. [2020-08-19 03:41:40,162 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-19 03:41:40,162 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 72 [2020-08-19 03:41:40,163 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:41:40,163 INFO L225 Difference]: With dead ends: 102 [2020-08-19 03:41:40,164 INFO L226 Difference]: Without dead ends: 80 [2020-08-19 03:41:40,164 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=391, Invalid=601, Unknown=0, NotChecked=0, Total=992 [2020-08-19 03:41:40,165 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-08-19 03:41:40,169 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 79. [2020-08-19 03:41:40,169 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-08-19 03:41:40,170 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 82 transitions. [2020-08-19 03:41:40,170 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 82 transitions. Word has length 72 [2020-08-19 03:41:40,170 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:41:40,170 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 82 transitions. [2020-08-19 03:41:40,170 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-19 03:41:40,170 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 82 transitions. [2020-08-19 03:41:40,171 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2020-08-19 03:41:40,171 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:41:40,171 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:41:40,171 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-19 03:41:40,172 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:41:40,172 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:41:40,172 INFO L82 PathProgramCache]: Analyzing trace with hash -1578855496, now seen corresponding path program 16 times [2020-08-19 03:41:40,172 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:41:40,172 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [597960092] [2020-08-19 03:41:40,172 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:41:40,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:40,224 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:41:40,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:40,233 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 03:41:40,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:41,511 INFO L134 CoverageAnalysis]: Checked inductivity of 581 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 03:41:41,511 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [597960092] [2020-08-19 03:41:41,512 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:41:41,512 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-19 03:41:41,512 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1299852071] [2020-08-19 03:41:41,513 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-19 03:41:41,513 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:41:41,513 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-19 03:41:41,514 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=357, Invalid=513, Unknown=0, NotChecked=0, Total=870 [2020-08-19 03:41:41,514 INFO L87 Difference]: Start difference. First operand 79 states and 82 transitions. Second operand 30 states. [2020-08-19 03:41:41,822 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:41:41,823 INFO L93 Difference]: Finished difference Result 104 states and 110 transitions. [2020-08-19 03:41:41,823 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-19 03:41:41,823 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 74 [2020-08-19 03:41:41,824 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:41:41,824 INFO L225 Difference]: With dead ends: 104 [2020-08-19 03:41:41,825 INFO L226 Difference]: Without dead ends: 82 [2020-08-19 03:41:41,826 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=419, Invalid=637, Unknown=0, NotChecked=0, Total=1056 [2020-08-19 03:41:41,826 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-08-19 03:41:41,830 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 81. [2020-08-19 03:41:41,830 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2020-08-19 03:41:41,831 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 84 transitions. [2020-08-19 03:41:41,831 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 84 transitions. Word has length 74 [2020-08-19 03:41:41,832 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:41:41,832 INFO L479 AbstractCegarLoop]: Abstraction has 81 states and 84 transitions. [2020-08-19 03:41:41,832 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-19 03:41:41,832 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 84 transitions. [2020-08-19 03:41:41,833 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2020-08-19 03:41:41,833 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:41:41,833 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:41:41,833 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-19 03:41:41,833 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:41:41,833 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:41:41,834 INFO L82 PathProgramCache]: Analyzing trace with hash 1300077050, now seen corresponding path program 17 times [2020-08-19 03:41:41,834 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:41:41,834 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1399405357] [2020-08-19 03:41:41,834 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:41:41,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:41,888 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:41:41,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:41,898 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 03:41:41,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:43,217 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 625 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 03:41:43,217 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1399405357] [2020-08-19 03:41:43,217 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:41:43,217 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-19 03:41:43,218 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1991402678] [2020-08-19 03:41:43,218 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-19 03:41:43,218 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:41:43,218 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-19 03:41:43,219 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=384, Invalid=546, Unknown=0, NotChecked=0, Total=930 [2020-08-19 03:41:43,219 INFO L87 Difference]: Start difference. First operand 81 states and 84 transitions. Second operand 31 states. [2020-08-19 03:41:43,658 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:41:43,658 INFO L93 Difference]: Finished difference Result 106 states and 112 transitions. [2020-08-19 03:41:43,658 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-19 03:41:43,659 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 76 [2020-08-19 03:41:43,659 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:41:43,660 INFO L225 Difference]: With dead ends: 106 [2020-08-19 03:41:43,660 INFO L226 Difference]: Without dead ends: 84 [2020-08-19 03:41:43,661 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=448, Invalid=674, Unknown=0, NotChecked=0, Total=1122 [2020-08-19 03:41:43,661 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2020-08-19 03:41:43,664 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 83. [2020-08-19 03:41:43,665 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2020-08-19 03:41:43,665 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 86 transitions. [2020-08-19 03:41:43,666 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 86 transitions. Word has length 76 [2020-08-19 03:41:43,666 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:41:43,666 INFO L479 AbstractCegarLoop]: Abstraction has 83 states and 86 transitions. [2020-08-19 03:41:43,666 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-19 03:41:43,666 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 86 transitions. [2020-08-19 03:41:43,667 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-08-19 03:41:43,667 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:41:43,667 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:41:43,667 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-19 03:41:43,667 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:41:43,668 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:41:43,668 INFO L82 PathProgramCache]: Analyzing trace with hash 1995315132, now seen corresponding path program 18 times [2020-08-19 03:41:43,668 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:41:43,668 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [74341373] [2020-08-19 03:41:43,668 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:41:43,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:43,718 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:41:43,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:43,728 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 03:41:43,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:45,147 INFO L134 CoverageAnalysis]: Checked inductivity of 681 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 03:41:45,147 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [74341373] [2020-08-19 03:41:45,147 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:41:45,147 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-19 03:41:45,148 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1251634824] [2020-08-19 03:41:45,148 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-19 03:41:45,148 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:41:45,148 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-19 03:41:45,148 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=412, Invalid=580, Unknown=0, NotChecked=0, Total=992 [2020-08-19 03:41:45,149 INFO L87 Difference]: Start difference. First operand 83 states and 86 transitions. Second operand 32 states. [2020-08-19 03:41:45,608 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:41:45,608 INFO L93 Difference]: Finished difference Result 108 states and 114 transitions. [2020-08-19 03:41:45,608 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-19 03:41:45,608 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 78 [2020-08-19 03:41:45,609 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:41:45,610 INFO L225 Difference]: With dead ends: 108 [2020-08-19 03:41:45,610 INFO L226 Difference]: Without dead ends: 86 [2020-08-19 03:41:45,611 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=478, Invalid=712, Unknown=0, NotChecked=0, Total=1190 [2020-08-19 03:41:45,611 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2020-08-19 03:41:45,615 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 85. [2020-08-19 03:41:45,615 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2020-08-19 03:41:45,616 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 88 transitions. [2020-08-19 03:41:45,616 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 88 transitions. Word has length 78 [2020-08-19 03:41:45,616 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:41:45,616 INFO L479 AbstractCegarLoop]: Abstraction has 85 states and 88 transitions. [2020-08-19 03:41:45,616 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-19 03:41:45,616 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 88 transitions. [2020-08-19 03:41:45,617 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2020-08-19 03:41:45,617 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:41:45,617 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:41:45,617 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-19 03:41:45,618 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:41:45,618 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:41:45,618 INFO L82 PathProgramCache]: Analyzing trace with hash 104213758, now seen corresponding path program 19 times [2020-08-19 03:41:45,618 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:41:45,618 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1545832915] [2020-08-19 03:41:45,618 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:41:45,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:45,670 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:41:45,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:45,681 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 03:41:45,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:47,134 INFO L134 CoverageAnalysis]: Checked inductivity of 734 backedges. 0 proven. 729 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 03:41:47,135 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1545832915] [2020-08-19 03:41:47,135 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:41:47,135 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-19 03:41:47,135 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1105361663] [2020-08-19 03:41:47,135 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-19 03:41:47,135 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:41:47,136 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-19 03:41:47,136 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=441, Invalid=615, Unknown=0, NotChecked=0, Total=1056 [2020-08-19 03:41:47,136 INFO L87 Difference]: Start difference. First operand 85 states and 88 transitions. Second operand 33 states. [2020-08-19 03:41:47,574 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:41:47,574 INFO L93 Difference]: Finished difference Result 110 states and 116 transitions. [2020-08-19 03:41:47,575 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-19 03:41:47,575 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 80 [2020-08-19 03:41:47,575 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:41:47,576 INFO L225 Difference]: With dead ends: 110 [2020-08-19 03:41:47,576 INFO L226 Difference]: Without dead ends: 88 [2020-08-19 03:41:47,578 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 [2020-08-19 03:41:47,578 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-08-19 03:41:47,581 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 87. [2020-08-19 03:41:47,581 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2020-08-19 03:41:47,582 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 90 transitions. [2020-08-19 03:41:47,582 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 90 transitions. Word has length 80 [2020-08-19 03:41:47,582 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:41:47,583 INFO L479 AbstractCegarLoop]: Abstraction has 87 states and 90 transitions. [2020-08-19 03:41:47,583 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-19 03:41:47,583 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 90 transitions. [2020-08-19 03:41:47,584 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2020-08-19 03:41:47,584 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:41:47,584 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:41:47,584 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-19 03:41:47,584 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:41:47,584 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:41:47,585 INFO L82 PathProgramCache]: Analyzing trace with hash -473040448, now seen corresponding path program 20 times [2020-08-19 03:41:47,585 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:41:47,585 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1534276283] [2020-08-19 03:41:47,585 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:41:47,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:47,642 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:41:47,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:47,653 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 03:41:47,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:49,201 INFO L134 CoverageAnalysis]: Checked inductivity of 789 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 03:41:49,202 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1534276283] [2020-08-19 03:41:49,202 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:41:49,202 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-19 03:41:49,202 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [30895952] [2020-08-19 03:41:49,202 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-19 03:41:49,203 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:41:49,203 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-19 03:41:49,203 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=471, Invalid=651, Unknown=0, NotChecked=0, Total=1122 [2020-08-19 03:41:49,203 INFO L87 Difference]: Start difference. First operand 87 states and 90 transitions. Second operand 34 states. [2020-08-19 03:41:49,668 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:41:49,669 INFO L93 Difference]: Finished difference Result 112 states and 118 transitions. [2020-08-19 03:41:49,669 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-19 03:41:49,670 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 82 [2020-08-19 03:41:49,670 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:41:49,670 INFO L225 Difference]: With dead ends: 112 [2020-08-19 03:41:49,671 INFO L226 Difference]: Without dead ends: 90 [2020-08-19 03:41:49,672 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=541, Invalid=791, Unknown=0, NotChecked=0, Total=1332 [2020-08-19 03:41:49,673 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2020-08-19 03:41:49,676 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 89. [2020-08-19 03:41:49,676 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2020-08-19 03:41:49,677 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 92 transitions. [2020-08-19 03:41:49,678 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 92 transitions. Word has length 82 [2020-08-19 03:41:49,678 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:41:49,678 INFO L479 AbstractCegarLoop]: Abstraction has 89 states and 92 transitions. [2020-08-19 03:41:49,679 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-19 03:41:49,679 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 92 transitions. [2020-08-19 03:41:49,679 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2020-08-19 03:41:49,679 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:41:49,679 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:41:49,680 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-19 03:41:49,680 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:41:49,680 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:41:49,680 INFO L82 PathProgramCache]: Analyzing trace with hash -1163551230, now seen corresponding path program 21 times [2020-08-19 03:41:49,680 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:41:49,680 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2055838313] [2020-08-19 03:41:49,680 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:41:49,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:49,776 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:41:49,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:49,787 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 03:41:49,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:51,453 INFO L134 CoverageAnalysis]: Checked inductivity of 846 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 03:41:51,453 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2055838313] [2020-08-19 03:41:51,453 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:41:51,454 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-19 03:41:51,454 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1389165096] [2020-08-19 03:41:51,454 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-19 03:41:51,454 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:41:51,454 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-19 03:41:51,455 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=502, Invalid=688, Unknown=0, NotChecked=0, Total=1190 [2020-08-19 03:41:51,455 INFO L87 Difference]: Start difference. First operand 89 states and 92 transitions. Second operand 35 states. [2020-08-19 03:41:51,963 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:41:51,964 INFO L93 Difference]: Finished difference Result 114 states and 120 transitions. [2020-08-19 03:41:51,964 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-19 03:41:51,964 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 84 [2020-08-19 03:41:51,965 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:41:51,965 INFO L225 Difference]: With dead ends: 114 [2020-08-19 03:41:51,965 INFO L226 Difference]: Without dead ends: 92 [2020-08-19 03:41:51,966 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=574, Invalid=832, Unknown=0, NotChecked=0, Total=1406 [2020-08-19 03:41:51,967 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2020-08-19 03:41:51,971 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 91. [2020-08-19 03:41:51,971 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2020-08-19 03:41:51,975 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 94 transitions. [2020-08-19 03:41:51,975 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 94 transitions. Word has length 84 [2020-08-19 03:41:51,976 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:41:51,976 INFO L479 AbstractCegarLoop]: Abstraction has 91 states and 94 transitions. [2020-08-19 03:41:51,976 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-19 03:41:51,976 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 94 transitions. [2020-08-19 03:41:51,977 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2020-08-19 03:41:51,977 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:41:51,977 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:41:51,978 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-19 03:41:51,978 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:41:51,978 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:41:51,978 INFO L82 PathProgramCache]: Analyzing trace with hash 975518148, now seen corresponding path program 22 times [2020-08-19 03:41:51,983 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:41:51,983 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [899571527] [2020-08-19 03:41:51,983 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:41:52,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:52,052 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:41:52,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:52,065 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 03:41:52,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:53,791 INFO L134 CoverageAnalysis]: Checked inductivity of 905 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 03:41:53,792 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [899571527] [2020-08-19 03:41:53,792 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:41:53,792 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-19 03:41:53,792 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [618873882] [2020-08-19 03:41:53,792 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-19 03:41:53,793 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:41:53,793 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-19 03:41:53,793 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=534, Invalid=726, Unknown=0, NotChecked=0, Total=1260 [2020-08-19 03:41:53,793 INFO L87 Difference]: Start difference. First operand 91 states and 94 transitions. Second operand 36 states. [2020-08-19 03:41:54,157 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:41:54,157 INFO L93 Difference]: Finished difference Result 116 states and 122 transitions. [2020-08-19 03:41:54,158 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-19 03:41:54,158 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 86 [2020-08-19 03:41:54,158 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:41:54,159 INFO L225 Difference]: With dead ends: 116 [2020-08-19 03:41:54,159 INFO L226 Difference]: Without dead ends: 94 [2020-08-19 03:41:54,160 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=608, Invalid=874, Unknown=0, NotChecked=0, Total=1482 [2020-08-19 03:41:54,161 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2020-08-19 03:41:54,164 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 93. [2020-08-19 03:41:54,165 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2020-08-19 03:41:54,165 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 96 transitions. [2020-08-19 03:41:54,165 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 96 transitions. Word has length 86 [2020-08-19 03:41:54,166 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:41:54,166 INFO L479 AbstractCegarLoop]: Abstraction has 93 states and 96 transitions. [2020-08-19 03:41:54,166 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-19 03:41:54,166 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 96 transitions. [2020-08-19 03:41:54,167 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2020-08-19 03:41:54,167 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:41:54,167 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:41:54,167 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-19 03:41:54,167 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:41:54,167 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:41:54,168 INFO L82 PathProgramCache]: Analyzing trace with hash -668144378, now seen corresponding path program 23 times [2020-08-19 03:41:54,168 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:41:54,168 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [752769954] [2020-08-19 03:41:54,168 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:41:54,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:54,228 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:41:54,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:54,240 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 03:41:54,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:56,078 INFO L134 CoverageAnalysis]: Checked inductivity of 966 backedges. 0 proven. 961 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 03:41:56,078 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [752769954] [2020-08-19 03:41:56,078 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:41:56,078 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-19 03:41:56,079 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1074845698] [2020-08-19 03:41:56,079 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-19 03:41:56,079 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:41:56,079 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-19 03:41:56,080 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=567, Invalid=765, Unknown=0, NotChecked=0, Total=1332 [2020-08-19 03:41:56,080 INFO L87 Difference]: Start difference. First operand 93 states and 96 transitions. Second operand 37 states. [2020-08-19 03:41:56,586 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:41:56,587 INFO L93 Difference]: Finished difference Result 118 states and 124 transitions. [2020-08-19 03:41:56,587 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-19 03:41:56,587 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 88 [2020-08-19 03:41:56,588 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:41:56,589 INFO L225 Difference]: With dead ends: 118 [2020-08-19 03:41:56,589 INFO L226 Difference]: Without dead ends: 96 [2020-08-19 03:41:56,591 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=643, Invalid=917, Unknown=0, NotChecked=0, Total=1560 [2020-08-19 03:41:56,591 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2020-08-19 03:41:56,595 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 95. [2020-08-19 03:41:56,595 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2020-08-19 03:41:56,596 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 98 transitions. [2020-08-19 03:41:56,596 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 98 transitions. Word has length 88 [2020-08-19 03:41:56,596 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:41:56,596 INFO L479 AbstractCegarLoop]: Abstraction has 95 states and 98 transitions. [2020-08-19 03:41:56,596 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-19 03:41:56,596 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 98 transitions. [2020-08-19 03:41:56,597 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2020-08-19 03:41:56,597 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:41:56,597 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:41:56,598 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-19 03:41:56,598 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:41:56,598 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:41:56,598 INFO L82 PathProgramCache]: Analyzing trace with hash 320133064, now seen corresponding path program 24 times [2020-08-19 03:41:56,598 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:41:56,599 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [108706292] [2020-08-19 03:41:56,599 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:41:56,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:56,661 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:41:56,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:56,671 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 03:41:56,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:58,575 INFO L134 CoverageAnalysis]: Checked inductivity of 1029 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 03:41:58,575 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [108706292] [2020-08-19 03:41:58,575 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:41:58,575 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-19 03:41:58,575 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [215259572] [2020-08-19 03:41:58,576 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-19 03:41:58,576 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:41:58,577 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-19 03:41:58,577 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=601, Invalid=805, Unknown=0, NotChecked=0, Total=1406 [2020-08-19 03:41:58,577 INFO L87 Difference]: Start difference. First operand 95 states and 98 transitions. Second operand 38 states. [2020-08-19 03:41:59,009 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:41:59,010 INFO L93 Difference]: Finished difference Result 120 states and 126 transitions. [2020-08-19 03:41:59,010 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-19 03:41:59,010 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 90 [2020-08-19 03:41:59,011 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:41:59,012 INFO L225 Difference]: With dead ends: 120 [2020-08-19 03:41:59,012 INFO L226 Difference]: Without dead ends: 98 [2020-08-19 03:41:59,013 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=679, Invalid=961, Unknown=0, NotChecked=0, Total=1640 [2020-08-19 03:41:59,014 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-08-19 03:41:59,018 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 97. [2020-08-19 03:41:59,018 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2020-08-19 03:41:59,019 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 100 transitions. [2020-08-19 03:41:59,019 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 100 transitions. Word has length 90 [2020-08-19 03:41:59,019 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:41:59,019 INFO L479 AbstractCegarLoop]: Abstraction has 97 states and 100 transitions. [2020-08-19 03:41:59,020 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-19 03:41:59,020 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 100 transitions. [2020-08-19 03:41:59,021 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2020-08-19 03:41:59,021 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:41:59,021 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:41:59,021 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-19 03:41:59,021 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:41:59,021 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:41:59,022 INFO L82 PathProgramCache]: Analyzing trace with hash 866982410, now seen corresponding path program 25 times [2020-08-19 03:41:59,022 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:41:59,022 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1557363573] [2020-08-19 03:41:59,022 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:41:59,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:59,084 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:41:59,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:41:59,095 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 03:41:59,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:01,162 INFO L134 CoverageAnalysis]: Checked inductivity of 1094 backedges. 0 proven. 1089 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 03:42:01,162 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1557363573] [2020-08-19 03:42:01,162 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:01,162 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-19 03:42:01,163 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [493152108] [2020-08-19 03:42:01,163 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-19 03:42:01,163 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:01,163 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-19 03:42:01,164 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=636, Invalid=846, Unknown=0, NotChecked=0, Total=1482 [2020-08-19 03:42:01,164 INFO L87 Difference]: Start difference. First operand 97 states and 100 transitions. Second operand 39 states. [2020-08-19 03:42:01,522 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:01,523 INFO L93 Difference]: Finished difference Result 122 states and 128 transitions. [2020-08-19 03:42:01,523 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-19 03:42:01,523 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 92 [2020-08-19 03:42:01,524 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:01,525 INFO L225 Difference]: With dead ends: 122 [2020-08-19 03:42:01,525 INFO L226 Difference]: Without dead ends: 100 [2020-08-19 03:42:01,526 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=716, Invalid=1006, Unknown=0, NotChecked=0, Total=1722 [2020-08-19 03:42:01,526 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2020-08-19 03:42:01,530 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 99. [2020-08-19 03:42:01,530 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2020-08-19 03:42:01,531 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 102 transitions. [2020-08-19 03:42:01,531 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 102 transitions. Word has length 92 [2020-08-19 03:42:01,531 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:01,531 INFO L479 AbstractCegarLoop]: Abstraction has 99 states and 102 transitions. [2020-08-19 03:42:01,531 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-19 03:42:01,531 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 102 transitions. [2020-08-19 03:42:01,532 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2020-08-19 03:42:01,532 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:01,532 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:01,533 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-19 03:42:01,533 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:01,533 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:01,533 INFO L82 PathProgramCache]: Analyzing trace with hash -1891773492, now seen corresponding path program 26 times [2020-08-19 03:42:01,533 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:01,533 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [735939279] [2020-08-19 03:42:01,534 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:01,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:01,595 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:01,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:01,606 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 03:42:01,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:03,743 INFO L134 CoverageAnalysis]: Checked inductivity of 1161 backedges. 0 proven. 1156 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 03:42:03,744 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [735939279] [2020-08-19 03:42:03,744 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:03,744 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-19 03:42:03,744 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1667362565] [2020-08-19 03:42:03,744 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-19 03:42:03,744 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:03,745 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-19 03:42:03,745 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=672, Invalid=888, Unknown=0, NotChecked=0, Total=1560 [2020-08-19 03:42:03,745 INFO L87 Difference]: Start difference. First operand 99 states and 102 transitions. Second operand 40 states. [2020-08-19 03:42:04,080 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:04,081 INFO L93 Difference]: Finished difference Result 124 states and 130 transitions. [2020-08-19 03:42:04,081 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-19 03:42:04,081 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 94 [2020-08-19 03:42:04,082 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:04,083 INFO L225 Difference]: With dead ends: 124 [2020-08-19 03:42:04,083 INFO L226 Difference]: Without dead ends: 102 [2020-08-19 03:42:04,084 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=754, Invalid=1052, Unknown=0, NotChecked=0, Total=1806 [2020-08-19 03:42:04,085 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2020-08-19 03:42:04,089 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 101. [2020-08-19 03:42:04,089 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2020-08-19 03:42:04,089 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 104 transitions. [2020-08-19 03:42:04,090 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 104 transitions. Word has length 94 [2020-08-19 03:42:04,090 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:04,090 INFO L479 AbstractCegarLoop]: Abstraction has 101 states and 104 transitions. [2020-08-19 03:42:04,090 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-19 03:42:04,090 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 104 transitions. [2020-08-19 03:42:04,091 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-08-19 03:42:04,091 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:04,091 INFO L422 BasicCegarLoop]: trace histogram [35, 35, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:04,091 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-19 03:42:04,091 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:04,091 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:04,092 INFO L82 PathProgramCache]: Analyzing trace with hash 1233593614, now seen corresponding path program 27 times [2020-08-19 03:42:04,092 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:04,092 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [581443198] [2020-08-19 03:42:04,092 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:04,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:04,165 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:04,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:04,179 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 03:42:04,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:06,385 INFO L134 CoverageAnalysis]: Checked inductivity of 1230 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 03:42:06,386 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [581443198] [2020-08-19 03:42:06,386 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:06,386 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-19 03:42:06,386 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1437652855] [2020-08-19 03:42:06,386 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-19 03:42:06,386 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:06,387 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-19 03:42:06,387 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=709, Invalid=931, Unknown=0, NotChecked=0, Total=1640 [2020-08-19 03:42:06,388 INFO L87 Difference]: Start difference. First operand 101 states and 104 transitions. Second operand 41 states. [2020-08-19 03:42:06,753 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:06,754 INFO L93 Difference]: Finished difference Result 126 states and 132 transitions. [2020-08-19 03:42:06,754 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-19 03:42:06,755 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 96 [2020-08-19 03:42:06,755 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:06,756 INFO L225 Difference]: With dead ends: 126 [2020-08-19 03:42:06,756 INFO L226 Difference]: Without dead ends: 104 [2020-08-19 03:42:06,758 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=793, Invalid=1099, Unknown=0, NotChecked=0, Total=1892 [2020-08-19 03:42:06,758 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2020-08-19 03:42:06,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 103. [2020-08-19 03:42:06,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2020-08-19 03:42:06,762 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 106 transitions. [2020-08-19 03:42:06,763 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 106 transitions. Word has length 96 [2020-08-19 03:42:06,763 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:06,763 INFO L479 AbstractCegarLoop]: Abstraction has 103 states and 106 transitions. [2020-08-19 03:42:06,763 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-19 03:42:06,763 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 106 transitions. [2020-08-19 03:42:06,764 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2020-08-19 03:42:06,764 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:06,764 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:06,764 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-19 03:42:06,764 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:06,764 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:06,765 INFO L82 PathProgramCache]: Analyzing trace with hash -1765724720, now seen corresponding path program 28 times [2020-08-19 03:42:06,765 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:06,765 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1987067870] [2020-08-19 03:42:06,765 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:06,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:06,826 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:06,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:06,836 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 03:42:06,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:09,138 INFO L134 CoverageAnalysis]: Checked inductivity of 1301 backedges. 0 proven. 1296 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 03:42:09,138 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1987067870] [2020-08-19 03:42:09,138 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:09,140 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-19 03:42:09,140 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [133978007] [2020-08-19 03:42:09,140 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-19 03:42:09,141 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:09,141 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-19 03:42:09,142 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=747, Invalid=975, Unknown=0, NotChecked=0, Total=1722 [2020-08-19 03:42:09,142 INFO L87 Difference]: Start difference. First operand 103 states and 106 transitions. Second operand 42 states. [2020-08-19 03:42:09,599 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:09,599 INFO L93 Difference]: Finished difference Result 128 states and 134 transitions. [2020-08-19 03:42:09,600 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-19 03:42:09,600 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 98 [2020-08-19 03:42:09,600 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:09,601 INFO L225 Difference]: With dead ends: 128 [2020-08-19 03:42:09,601 INFO L226 Difference]: Without dead ends: 106 [2020-08-19 03:42:09,603 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=833, Invalid=1147, Unknown=0, NotChecked=0, Total=1980 [2020-08-19 03:42:09,603 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2020-08-19 03:42:09,607 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 105. [2020-08-19 03:42:09,607 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2020-08-19 03:42:09,608 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 108 transitions. [2020-08-19 03:42:09,608 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 108 transitions. Word has length 98 [2020-08-19 03:42:09,608 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:09,608 INFO L479 AbstractCegarLoop]: Abstraction has 105 states and 108 transitions. [2020-08-19 03:42:09,609 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-19 03:42:09,609 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 108 transitions. [2020-08-19 03:42:09,609 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2020-08-19 03:42:09,609 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:09,610 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:09,610 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-19 03:42:09,610 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:09,610 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:09,610 INFO L82 PathProgramCache]: Analyzing trace with hash 2107379218, now seen corresponding path program 29 times [2020-08-19 03:42:09,610 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:09,611 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [623978693] [2020-08-19 03:42:09,611 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:09,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:09,678 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:09,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:09,688 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 03:42:09,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:12,135 INFO L134 CoverageAnalysis]: Checked inductivity of 1374 backedges. 0 proven. 1369 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 03:42:12,135 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [623978693] [2020-08-19 03:42:12,135 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:12,135 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-19 03:42:12,135 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1566194226] [2020-08-19 03:42:12,136 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-19 03:42:12,136 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:12,136 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-19 03:42:12,137 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=786, Invalid=1020, Unknown=0, NotChecked=0, Total=1806 [2020-08-19 03:42:12,137 INFO L87 Difference]: Start difference. First operand 105 states and 108 transitions. Second operand 43 states. [2020-08-19 03:42:12,739 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:12,739 INFO L93 Difference]: Finished difference Result 130 states and 136 transitions. [2020-08-19 03:42:12,739 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-08-19 03:42:12,740 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 100 [2020-08-19 03:42:12,740 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:12,741 INFO L225 Difference]: With dead ends: 130 [2020-08-19 03:42:12,741 INFO L226 Difference]: Without dead ends: 108 [2020-08-19 03:42:12,742 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=874, Invalid=1196, Unknown=0, NotChecked=0, Total=2070 [2020-08-19 03:42:12,742 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-08-19 03:42:12,746 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 107. [2020-08-19 03:42:12,746 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2020-08-19 03:42:12,747 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 110 transitions. [2020-08-19 03:42:12,747 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 110 transitions. Word has length 100 [2020-08-19 03:42:12,747 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:12,748 INFO L479 AbstractCegarLoop]: Abstraction has 107 states and 110 transitions. [2020-08-19 03:42:12,748 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-19 03:42:12,748 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 110 transitions. [2020-08-19 03:42:12,748 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2020-08-19 03:42:12,748 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:12,749 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] [2020-08-19 03:42:12,749 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-08-19 03:42:12,749 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:12,749 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:12,749 INFO L82 PathProgramCache]: Analyzing trace with hash 423618004, now seen corresponding path program 30 times [2020-08-19 03:42:12,749 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:12,750 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1336820404] [2020-08-19 03:42:12,750 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:12,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:12,813 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:12,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:12,836 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 03:42:12,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat