/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=5000 --traceabstraction.additional.smt.options interpolation-heuristic=LOWLEXORDER --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-lit/afnp2014.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 18:16:36,975 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 18:16:36,978 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 18:16:37,021 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 18:16:37,022 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 18:16:37,035 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 18:16:37,036 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 18:16:37,039 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 18:16:37,041 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 18:16:37,043 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 18:16:37,044 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 18:16:37,046 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 18:16:37,047 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 18:16:37,051 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 18:16:37,054 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 18:16:37,056 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 18:16:37,057 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 18:16:37,060 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 18:16:37,062 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 18:16:37,068 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 18:16:37,072 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 18:16:37,073 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 18:16:37,074 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 18:16:37,075 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 18:16:37,079 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-21 18:16:37,090 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 18:16:37,091 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 18:16:37,092 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 18:16:37,093 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 [2020-08-21 18:16:37,131 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 18:16:37,131 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 18:16:37,133 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 18:16:37,133 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 18:16:37,134 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 18:16:37,134 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 18:16:37,134 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 18:16:37,135 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 18:16:37,135 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 18:16:37,135 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 18:16:37,136 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 18:16:37,136 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 18:16:37,136 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 18:16:37,137 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 18:16:37,137 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 18:16:37,137 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 18:16:37,137 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 18:16:37,138 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 18:16:37,138 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 18:16:37,138 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 18:16:37,138 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 18:16:37,138 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 18:16:37,139 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 18:16:37,139 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 18:16:37,139 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 18:16:37,139 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 18:16:37,139 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 18:16:37,140 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 18:16:37,140 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 18:16:37,140 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=5000;interpolation-heuristic=LOWLEXORDER;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=LOWLEXORDER;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=LOWLEXORDER;log-additional-information=true; [2020-08-21 18:16:37,441 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 18:16:37,453 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 18:16:37,456 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 18:16:37,457 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 18:16:37,458 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 18:16:37,458 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/afnp2014.i [2020-08-21 18:16:37,529 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/5f52647e0/94ebfb5bab1f451da586e88743c5c9f9/FLAG979f5f92e [2020-08-21 18:16:37,989 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 18:16:37,990 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-lit/afnp2014.i [2020-08-21 18:16:37,996 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/5f52647e0/94ebfb5bab1f451da586e88743c5c9f9/FLAG979f5f92e [2020-08-21 18:16:38,379 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/5f52647e0/94ebfb5bab1f451da586e88743c5c9f9 [2020-08-21 18:16:38,390 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 18:16:38,392 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 18:16:38,393 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 18:16:38,393 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 18:16:38,397 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 18:16:38,398 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 06:16:38" (1/1) ... [2020-08-21 18:16:38,401 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5f32ca57 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:16:38, skipping insertion in model container [2020-08-21 18:16:38,401 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 06:16:38" (1/1) ... [2020-08-21 18:16:38,409 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 18:16:38,425 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 18:16:38,606 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 18:16:38,611 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 18:16:38,627 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 18:16:38,643 INFO L208 MainTranslator]: Completed translation [2020-08-21 18:16:38,643 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:16:38 WrapperNode [2020-08-21 18:16:38,643 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 18:16:38,644 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 18:16:38,645 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 18:16:38,645 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 18:16:38,659 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:16:38" (1/1) ... [2020-08-21 18:16:38,660 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:16:38" (1/1) ... [2020-08-21 18:16:38,745 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:16:38" (1/1) ... [2020-08-21 18:16:38,748 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:16:38" (1/1) ... [2020-08-21 18:16:38,753 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:16:38" (1/1) ... [2020-08-21 18:16:38,760 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:16:38" (1/1) ... [2020-08-21 18:16:38,761 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:16:38" (1/1) ... [2020-08-21 18:16:38,763 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 18:16:38,763 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 18:16:38,763 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 18:16:38,763 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 18:16:38,764 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:16:38" (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 [2020-08-21 18:16:38,827 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 18:16:38,827 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 18:16:38,828 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-08-21 18:16:38,828 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-21 18:16:38,828 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 18:16:38,829 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 18:16:38,829 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-21 18:16:38,829 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-08-21 18:16:38,829 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-21 18:16:38,830 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-21 18:16:38,830 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 18:16:38,830 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 18:16:38,831 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 18:16:39,022 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 18:16:39,023 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-21 18:16:39,027 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 06:16:39 BoogieIcfgContainer [2020-08-21 18:16:39,027 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 18:16:39,031 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 18:16:39,043 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 18:16:39,053 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 18:16:39,056 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 06:16:38" (1/3) ... [2020-08-21 18:16:39,058 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@30bf59c9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 06:16:39, skipping insertion in model container [2020-08-21 18:16:39,058 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:16:38" (2/3) ... [2020-08-21 18:16:39,059 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@30bf59c9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 06:16:39, skipping insertion in model container [2020-08-21 18:16:39,059 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 06:16:39" (3/3) ... [2020-08-21 18:16:39,065 INFO L109 eAbstractionObserver]: Analyzing ICFG afnp2014.i [2020-08-21 18:16:39,097 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 18:16:39,117 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 18:16:39,139 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 18:16:39,164 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 18:16:39,164 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 18:16:39,164 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 18:16:39,164 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 18:16:39,164 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 18:16:39,165 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 18:16:39,165 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 18:16:39,165 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 18:16:39,185 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-08-21 18:16:39,190 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-21 18:16:39,190 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:39,191 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:39,192 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:39,197 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:39,197 INFO L82 PathProgramCache]: Analyzing trace with hash -1915647303, now seen corresponding path program 1 times [2020-08-21 18:16:39,204 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:39,205 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [812238610] [2020-08-21 18:16:39,205 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:39,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:39,299 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:39,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:39,312 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:39,313 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [812238610] [2020-08-21 18:16:39,315 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 18:16:39,316 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-08-21 18:16:39,317 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1272626836] [2020-08-21 18:16:39,322 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-08-21 18:16:39,323 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:39,337 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-08-21 18:16:39,340 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-21 18:16:39,342 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 2 states. [2020-08-21 18:16:39,366 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:39,366 INFO L93 Difference]: Finished difference Result 32 states and 36 transitions. [2020-08-21 18:16:39,366 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-08-21 18:16:39,368 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2020-08-21 18:16:39,368 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:39,379 INFO L225 Difference]: With dead ends: 32 [2020-08-21 18:16:39,379 INFO L226 Difference]: Without dead ends: 13 [2020-08-21 18:16:39,384 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-21 18:16:39,417 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-08-21 18:16:39,434 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-08-21 18:16:39,435 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-08-21 18:16:39,436 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2020-08-21 18:16:39,438 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 10 [2020-08-21 18:16:39,438 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:39,438 INFO L479 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2020-08-21 18:16:39,438 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-08-21 18:16:39,439 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2020-08-21 18:16:39,439 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-21 18:16:39,439 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:39,440 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:39,440 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 18:16:39,440 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:39,441 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:39,441 INFO L82 PathProgramCache]: Analyzing trace with hash 2084433522, now seen corresponding path program 1 times [2020-08-21 18:16:39,442 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:39,443 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1899707220] [2020-08-21 18:16:39,443 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:39,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:39,578 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:39,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:39,582 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:39,583 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1899707220] [2020-08-21 18:16:39,583 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 18:16:39,584 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-21 18:16:39,584 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1593591588] [2020-08-21 18:16:39,586 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 18:16:39,587 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:39,587 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 18:16:39,588 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-21 18:16:39,588 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand 5 states. [2020-08-21 18:16:39,668 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:39,669 INFO L93 Difference]: Finished difference Result 21 states and 23 transitions. [2020-08-21 18:16:39,669 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 18:16:39,669 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 12 [2020-08-21 18:16:39,670 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:39,670 INFO L225 Difference]: With dead ends: 21 [2020-08-21 18:16:39,671 INFO L226 Difference]: Without dead ends: 16 [2020-08-21 18:16:39,672 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-21 18:16:39,673 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-21 18:16:39,679 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-08-21 18:16:39,680 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-21 18:16:39,681 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2020-08-21 18:16:39,681 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 12 [2020-08-21 18:16:39,681 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:39,682 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2020-08-21 18:16:39,682 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 18:16:39,682 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2020-08-21 18:16:39,683 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-21 18:16:39,683 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:39,683 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:39,683 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 18:16:39,684 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:39,684 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:39,684 INFO L82 PathProgramCache]: Analyzing trace with hash 249504553, now seen corresponding path program 1 times [2020-08-21 18:16:39,685 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:39,685 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1535045935] [2020-08-21 18:16:39,685 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:39,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:39,805 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:39,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:39,810 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:39,811 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1535045935] [2020-08-21 18:16:39,811 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:39,811 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-21 18:16:39,812 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1094249488] [2020-08-21 18:16:39,812 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 18:16:39,812 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:39,813 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 18:16:39,813 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-08-21 18:16:39,813 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand 6 states. [2020-08-21 18:16:39,875 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:39,876 INFO L93 Difference]: Finished difference Result 24 states and 27 transitions. [2020-08-21 18:16:39,876 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 18:16:39,876 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 15 [2020-08-21 18:16:39,877 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:39,877 INFO L225 Difference]: With dead ends: 24 [2020-08-21 18:16:39,878 INFO L226 Difference]: Without dead ends: 19 [2020-08-21 18:16:39,879 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-08-21 18:16:39,879 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-08-21 18:16:39,884 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-08-21 18:16:39,884 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-08-21 18:16:39,885 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 22 transitions. [2020-08-21 18:16:39,885 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 22 transitions. Word has length 15 [2020-08-21 18:16:39,885 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:39,886 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 22 transitions. [2020-08-21 18:16:39,886 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 18:16:39,886 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 22 transitions. [2020-08-21 18:16:39,886 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-21 18:16:39,887 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:39,887 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:39,887 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 18:16:39,887 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:39,888 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:39,888 INFO L82 PathProgramCache]: Analyzing trace with hash -2070634734, now seen corresponding path program 2 times [2020-08-21 18:16:39,888 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:39,888 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1000483824] [2020-08-21 18:16:39,889 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:39,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:39,980 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:39,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:39,984 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:39,985 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1000483824] [2020-08-21 18:16:39,985 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:39,985 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 18:16:39,986 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [331506724] [2020-08-21 18:16:39,986 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 18:16:39,986 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:39,986 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 18:16:39,987 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-08-21 18:16:39,987 INFO L87 Difference]: Start difference. First operand 19 states and 22 transitions. Second operand 7 states. [2020-08-21 18:16:40,067 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:40,067 INFO L93 Difference]: Finished difference Result 27 states and 31 transitions. [2020-08-21 18:16:40,068 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 18:16:40,068 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 18 [2020-08-21 18:16:40,069 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:40,069 INFO L225 Difference]: With dead ends: 27 [2020-08-21 18:16:40,069 INFO L226 Difference]: Without dead ends: 22 [2020-08-21 18:16:40,070 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2020-08-21 18:16:40,071 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-21 18:16:40,074 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2020-08-21 18:16:40,075 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-08-21 18:16:40,076 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 26 transitions. [2020-08-21 18:16:40,076 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 26 transitions. Word has length 18 [2020-08-21 18:16:40,076 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:40,076 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 26 transitions. [2020-08-21 18:16:40,077 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 18:16:40,077 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 26 transitions. [2020-08-21 18:16:40,077 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-08-21 18:16:40,077 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:40,078 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:40,078 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 18:16:40,078 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:40,078 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:40,079 INFO L82 PathProgramCache]: Analyzing trace with hash 1863528073, now seen corresponding path program 3 times [2020-08-21 18:16:40,079 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:40,079 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [739881325] [2020-08-21 18:16:40,080 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:40,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:40,236 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:40,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:40,246 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:40,247 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [739881325] [2020-08-21 18:16:40,247 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:40,247 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 18:16:40,248 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [951098511] [2020-08-21 18:16:40,248 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 18:16:40,249 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:40,250 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 18:16:40,250 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2020-08-21 18:16:40,251 INFO L87 Difference]: Start difference. First operand 22 states and 26 transitions. Second operand 8 states. [2020-08-21 18:16:40,344 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:40,344 INFO L93 Difference]: Finished difference Result 30 states and 35 transitions. [2020-08-21 18:16:40,345 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-21 18:16:40,345 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 21 [2020-08-21 18:16:40,345 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:40,346 INFO L225 Difference]: With dead ends: 30 [2020-08-21 18:16:40,346 INFO L226 Difference]: Without dead ends: 25 [2020-08-21 18:16:40,347 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2020-08-21 18:16:40,348 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-21 18:16:40,352 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-08-21 18:16:40,353 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-21 18:16:40,354 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 30 transitions. [2020-08-21 18:16:40,354 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 30 transitions. Word has length 21 [2020-08-21 18:16:40,354 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:40,355 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 30 transitions. [2020-08-21 18:16:40,355 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 18:16:40,355 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 30 transitions. [2020-08-21 18:16:40,367 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-21 18:16:40,367 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:40,367 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:40,368 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 18:16:40,368 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:40,368 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:40,368 INFO L82 PathProgramCache]: Analyzing trace with hash -854829134, now seen corresponding path program 4 times [2020-08-21 18:16:40,369 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:40,369 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2067429395] [2020-08-21 18:16:40,369 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:40,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:40,487 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:40,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:40,491 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:40,492 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2067429395] [2020-08-21 18:16:40,492 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:40,492 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 18:16:40,492 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [115221058] [2020-08-21 18:16:40,493 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 18:16:40,493 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:40,493 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 18:16:40,494 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-08-21 18:16:40,494 INFO L87 Difference]: Start difference. First operand 25 states and 30 transitions. Second operand 9 states. [2020-08-21 18:16:40,586 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:40,587 INFO L93 Difference]: Finished difference Result 33 states and 39 transitions. [2020-08-21 18:16:40,587 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 18:16:40,587 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 24 [2020-08-21 18:16:40,588 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:40,588 INFO L225 Difference]: With dead ends: 33 [2020-08-21 18:16:40,588 INFO L226 Difference]: Without dead ends: 28 [2020-08-21 18:16:40,589 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=71, Unknown=0, NotChecked=0, Total=90 [2020-08-21 18:16:40,589 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-21 18:16:40,594 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-08-21 18:16:40,594 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-21 18:16:40,595 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 34 transitions. [2020-08-21 18:16:40,596 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 34 transitions. Word has length 24 [2020-08-21 18:16:40,596 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:40,596 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 34 transitions. [2020-08-21 18:16:40,596 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 18:16:40,596 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 34 transitions. [2020-08-21 18:16:40,597 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-21 18:16:40,597 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:40,597 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:40,598 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 18:16:40,598 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:40,598 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:40,599 INFO L82 PathProgramCache]: Analyzing trace with hash -1826016791, now seen corresponding path program 5 times [2020-08-21 18:16:40,599 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:40,599 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1991959633] [2020-08-21 18:16:40,599 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:40,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:40,723 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:40,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:40,727 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:40,728 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1991959633] [2020-08-21 18:16:40,728 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:40,728 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-21 18:16:40,728 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [523353158] [2020-08-21 18:16:40,729 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 18:16:40,729 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:40,729 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 18:16:40,730 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2020-08-21 18:16:40,730 INFO L87 Difference]: Start difference. First operand 28 states and 34 transitions. Second operand 10 states. [2020-08-21 18:16:40,827 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:40,827 INFO L93 Difference]: Finished difference Result 36 states and 43 transitions. [2020-08-21 18:16:40,828 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 18:16:40,828 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-08-21 18:16:40,828 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:40,829 INFO L225 Difference]: With dead ends: 36 [2020-08-21 18:16:40,829 INFO L226 Difference]: Without dead ends: 31 [2020-08-21 18:16:40,830 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=89, Unknown=0, NotChecked=0, Total=110 [2020-08-21 18:16:40,830 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-21 18:16:40,835 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2020-08-21 18:16:40,835 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-21 18:16:40,836 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 38 transitions. [2020-08-21 18:16:40,836 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 38 transitions. Word has length 27 [2020-08-21 18:16:40,836 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:40,836 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 38 transitions. [2020-08-21 18:16:40,837 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 18:16:40,837 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 38 transitions. [2020-08-21 18:16:40,838 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-21 18:16:40,838 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:40,838 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:40,838 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 18:16:40,839 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:40,839 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:40,839 INFO L82 PathProgramCache]: Analyzing trace with hash 717166674, now seen corresponding path program 6 times [2020-08-21 18:16:40,839 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:40,840 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1772193575] [2020-08-21 18:16:40,840 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:40,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:40,993 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:40,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:41,001 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 0 proven. 63 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:41,001 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1772193575] [2020-08-21 18:16:41,002 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:41,002 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-21 18:16:41,002 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [156721201] [2020-08-21 18:16:41,003 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 18:16:41,004 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:41,004 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 18:16:41,005 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2020-08-21 18:16:41,005 INFO L87 Difference]: Start difference. First operand 31 states and 38 transitions. Second operand 11 states. [2020-08-21 18:16:41,148 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:41,149 INFO L93 Difference]: Finished difference Result 39 states and 47 transitions. [2020-08-21 18:16:41,149 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-21 18:16:41,149 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 30 [2020-08-21 18:16:41,150 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:41,150 INFO L225 Difference]: With dead ends: 39 [2020-08-21 18:16:41,150 INFO L226 Difference]: Without dead ends: 34 [2020-08-21 18:16:41,151 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=109, Unknown=0, NotChecked=0, Total=132 [2020-08-21 18:16:41,151 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-21 18:16:41,156 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-08-21 18:16:41,156 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-21 18:16:41,157 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 42 transitions. [2020-08-21 18:16:41,157 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 42 transitions. Word has length 30 [2020-08-21 18:16:41,158 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:41,158 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 42 transitions. [2020-08-21 18:16:41,158 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 18:16:41,158 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 42 transitions. [2020-08-21 18:16:41,159 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-21 18:16:41,159 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:41,159 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:41,160 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-21 18:16:41,160 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:41,160 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:41,160 INFO L82 PathProgramCache]: Analyzing trace with hash 1472671049, now seen corresponding path program 7 times [2020-08-21 18:16:41,161 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:41,161 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1672253766] [2020-08-21 18:16:41,161 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:41,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:41,329 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:41,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:41,335 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 0 proven. 84 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:41,335 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1672253766] [2020-08-21 18:16:41,336 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:41,336 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-21 18:16:41,340 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1337983687] [2020-08-21 18:16:41,341 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-21 18:16:41,342 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:41,342 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-21 18:16:41,343 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2020-08-21 18:16:41,343 INFO L87 Difference]: Start difference. First operand 34 states and 42 transitions. Second operand 12 states. [2020-08-21 18:16:41,510 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:41,511 INFO L93 Difference]: Finished difference Result 42 states and 51 transitions. [2020-08-21 18:16:41,511 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-21 18:16:41,511 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 33 [2020-08-21 18:16:41,512 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:41,512 INFO L225 Difference]: With dead ends: 42 [2020-08-21 18:16:41,512 INFO L226 Difference]: Without dead ends: 37 [2020-08-21 18:16:41,513 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=131, Unknown=0, NotChecked=0, Total=156 [2020-08-21 18:16:41,514 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-21 18:16:41,520 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-08-21 18:16:41,520 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-21 18:16:41,521 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 46 transitions. [2020-08-21 18:16:41,521 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 46 transitions. Word has length 33 [2020-08-21 18:16:41,521 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:41,521 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 46 transitions. [2020-08-21 18:16:41,522 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-21 18:16:41,522 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 46 transitions. [2020-08-21 18:16:41,523 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-21 18:16:41,523 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:41,524 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:41,524 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-21 18:16:41,524 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:41,524 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:41,525 INFO L82 PathProgramCache]: Analyzing trace with hash -1220091662, now seen corresponding path program 8 times [2020-08-21 18:16:41,525 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:41,525 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [931094906] [2020-08-21 18:16:41,525 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:41,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:41,726 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:41,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:41,730 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 0 proven. 108 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:41,731 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [931094906] [2020-08-21 18:16:41,731 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:41,731 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 18:16:41,731 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1058590707] [2020-08-21 18:16:41,732 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 18:16:41,732 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:41,732 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 18:16:41,733 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2020-08-21 18:16:41,733 INFO L87 Difference]: Start difference. First operand 37 states and 46 transitions. Second operand 13 states. [2020-08-21 18:16:41,903 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:41,903 INFO L93 Difference]: Finished difference Result 45 states and 55 transitions. [2020-08-21 18:16:41,903 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-21 18:16:41,903 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 36 [2020-08-21 18:16:41,904 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:41,905 INFO L225 Difference]: With dead ends: 45 [2020-08-21 18:16:41,905 INFO L226 Difference]: Without dead ends: 40 [2020-08-21 18:16:41,905 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=155, Unknown=0, NotChecked=0, Total=182 [2020-08-21 18:16:41,906 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-21 18:16:41,911 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2020-08-21 18:16:41,911 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-21 18:16:41,912 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 50 transitions. [2020-08-21 18:16:41,912 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 50 transitions. Word has length 36 [2020-08-21 18:16:41,912 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:41,913 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 50 transitions. [2020-08-21 18:16:41,913 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 18:16:41,913 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 50 transitions. [2020-08-21 18:16:41,914 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-21 18:16:41,914 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:41,914 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:41,914 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-21 18:16:41,914 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:41,915 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:41,915 INFO L82 PathProgramCache]: Analyzing trace with hash 85139625, now seen corresponding path program 9 times [2020-08-21 18:16:41,915 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:41,915 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [66638712] [2020-08-21 18:16:41,916 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:41,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:42,091 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:42,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:42,096 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 0 proven. 135 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:42,096 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [66638712] [2020-08-21 18:16:42,097 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:42,097 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-21 18:16:42,097 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1373722304] [2020-08-21 18:16:42,098 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-21 18:16:42,098 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:42,098 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-21 18:16:42,098 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=157, Unknown=0, NotChecked=0, Total=182 [2020-08-21 18:16:42,099 INFO L87 Difference]: Start difference. First operand 40 states and 50 transitions. Second operand 14 states. [2020-08-21 18:16:42,302 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:42,302 INFO L93 Difference]: Finished difference Result 48 states and 59 transitions. [2020-08-21 18:16:42,302 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-21 18:16:42,303 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 39 [2020-08-21 18:16:42,303 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:42,304 INFO L225 Difference]: With dead ends: 48 [2020-08-21 18:16:42,304 INFO L226 Difference]: Without dead ends: 43 [2020-08-21 18:16:42,305 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=29, Invalid=181, Unknown=0, NotChecked=0, Total=210 [2020-08-21 18:16:42,306 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-21 18:16:42,314 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-08-21 18:16:42,314 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-21 18:16:42,315 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 54 transitions. [2020-08-21 18:16:42,316 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 54 transitions. Word has length 39 [2020-08-21 18:16:42,316 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:42,316 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 54 transitions. [2020-08-21 18:16:42,316 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-21 18:16:42,316 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 54 transitions. [2020-08-21 18:16:42,319 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-21 18:16:42,320 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:42,320 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:42,320 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-21 18:16:42,321 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:42,321 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:42,321 INFO L82 PathProgramCache]: Analyzing trace with hash 1891479954, now seen corresponding path program 10 times [2020-08-21 18:16:42,321 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:42,322 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [750468088] [2020-08-21 18:16:42,322 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:42,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:42,541 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:42,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:42,547 INFO L134 CoverageAnalysis]: Checked inductivity of 165 backedges. 0 proven. 165 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:42,547 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [750468088] [2020-08-21 18:16:42,548 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:42,548 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-21 18:16:42,548 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2113447544] [2020-08-21 18:16:42,549 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-21 18:16:42,549 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:42,549 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-21 18:16:42,549 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2020-08-21 18:16:42,550 INFO L87 Difference]: Start difference. First operand 43 states and 54 transitions. Second operand 15 states. [2020-08-21 18:16:42,800 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:42,800 INFO L93 Difference]: Finished difference Result 51 states and 63 transitions. [2020-08-21 18:16:42,801 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-21 18:16:42,801 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 42 [2020-08-21 18:16:42,801 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:42,802 INFO L225 Difference]: With dead ends: 51 [2020-08-21 18:16:42,803 INFO L226 Difference]: Without dead ends: 46 [2020-08-21 18:16:42,803 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=209, Unknown=0, NotChecked=0, Total=240 [2020-08-21 18:16:42,804 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-21 18:16:42,813 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2020-08-21 18:16:42,814 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-21 18:16:42,815 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 58 transitions. [2020-08-21 18:16:42,815 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 58 transitions. Word has length 42 [2020-08-21 18:16:42,816 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:42,816 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 58 transitions. [2020-08-21 18:16:42,816 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-21 18:16:42,816 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 58 transitions. [2020-08-21 18:16:42,820 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-08-21 18:16:42,820 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:42,821 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:42,821 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-21 18:16:42,821 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:42,821 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:42,822 INFO L82 PathProgramCache]: Analyzing trace with hash -1363997687, now seen corresponding path program 11 times [2020-08-21 18:16:42,822 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:42,822 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1547388571] [2020-08-21 18:16:42,822 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:42,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:43,030 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:43,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:43,035 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 0 proven. 198 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:43,036 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1547388571] [2020-08-21 18:16:43,036 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:43,036 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-21 18:16:43,036 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [399442154] [2020-08-21 18:16:43,037 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-21 18:16:43,037 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:43,037 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-21 18:16:43,037 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=211, Unknown=0, NotChecked=0, Total=240 [2020-08-21 18:16:43,038 INFO L87 Difference]: Start difference. First operand 46 states and 58 transitions. Second operand 16 states. [2020-08-21 18:16:43,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:43,336 INFO L93 Difference]: Finished difference Result 54 states and 67 transitions. [2020-08-21 18:16:43,337 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-21 18:16:43,337 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 45 [2020-08-21 18:16:43,337 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:43,338 INFO L225 Difference]: With dead ends: 54 [2020-08-21 18:16:43,338 INFO L226 Difference]: Without dead ends: 49 [2020-08-21 18:16:43,339 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=239, Unknown=0, NotChecked=0, Total=272 [2020-08-21 18:16:43,339 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-21 18:16:43,344 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-21 18:16:43,344 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-21 18:16:43,345 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 62 transitions. [2020-08-21 18:16:43,345 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 62 transitions. Word has length 45 [2020-08-21 18:16:43,345 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:43,346 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 62 transitions. [2020-08-21 18:16:43,346 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-21 18:16:43,346 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 62 transitions. [2020-08-21 18:16:43,348 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-21 18:16:43,348 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:43,348 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:43,348 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-21 18:16:43,349 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:43,349 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:43,349 INFO L82 PathProgramCache]: Analyzing trace with hash -641889742, now seen corresponding path program 12 times [2020-08-21 18:16:43,349 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:43,350 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1499078658] [2020-08-21 18:16:43,350 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:43,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:43,572 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:43,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:43,578 INFO L134 CoverageAnalysis]: Checked inductivity of 234 backedges. 0 proven. 234 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:43,579 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1499078658] [2020-08-21 18:16:43,579 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:43,579 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-21 18:16:43,579 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [725074232] [2020-08-21 18:16:43,580 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-21 18:16:43,580 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:43,580 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-21 18:16:43,581 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2020-08-21 18:16:43,581 INFO L87 Difference]: Start difference. First operand 49 states and 62 transitions. Second operand 17 states. [2020-08-21 18:16:43,886 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:43,886 INFO L93 Difference]: Finished difference Result 57 states and 71 transitions. [2020-08-21 18:16:43,887 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-21 18:16:43,887 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 48 [2020-08-21 18:16:43,887 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:43,888 INFO L225 Difference]: With dead ends: 57 [2020-08-21 18:16:43,888 INFO L226 Difference]: Without dead ends: 52 [2020-08-21 18:16:43,890 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=35, Invalid=271, Unknown=0, NotChecked=0, Total=306 [2020-08-21 18:16:43,890 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-21 18:16:43,898 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2020-08-21 18:16:43,899 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-08-21 18:16:43,901 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 66 transitions. [2020-08-21 18:16:43,901 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 66 transitions. Word has length 48 [2020-08-21 18:16:43,901 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:43,901 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 66 transitions. [2020-08-21 18:16:43,901 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-21 18:16:43,902 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 66 transitions. [2020-08-21 18:16:43,904 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-08-21 18:16:43,904 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:43,904 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:43,904 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-21 18:16:43,905 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:43,905 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:43,905 INFO L82 PathProgramCache]: Analyzing trace with hash -1815285911, now seen corresponding path program 13 times [2020-08-21 18:16:43,905 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:43,905 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1692573853] [2020-08-21 18:16:43,906 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:43,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:44,175 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:44,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:44,184 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 0 proven. 273 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:44,185 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1692573853] [2020-08-21 18:16:44,185 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:44,185 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-21 18:16:44,185 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [510338400] [2020-08-21 18:16:44,186 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-21 18:16:44,186 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:44,186 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-21 18:16:44,187 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=273, Unknown=0, NotChecked=0, Total=306 [2020-08-21 18:16:44,187 INFO L87 Difference]: Start difference. First operand 52 states and 66 transitions. Second operand 18 states. [2020-08-21 18:16:44,580 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:44,580 INFO L93 Difference]: Finished difference Result 60 states and 75 transitions. [2020-08-21 18:16:44,580 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-21 18:16:44,581 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 51 [2020-08-21 18:16:44,581 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:44,581 INFO L225 Difference]: With dead ends: 60 [2020-08-21 18:16:44,581 INFO L226 Difference]: Without dead ends: 55 [2020-08-21 18:16:44,582 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=37, Invalid=305, Unknown=0, NotChecked=0, Total=342 [2020-08-21 18:16:44,583 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-08-21 18:16:44,593 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2020-08-21 18:16:44,593 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-21 18:16:44,594 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 70 transitions. [2020-08-21 18:16:44,594 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 70 transitions. Word has length 51 [2020-08-21 18:16:44,594 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:44,594 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 70 transitions. [2020-08-21 18:16:44,595 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-21 18:16:44,595 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 70 transitions. [2020-08-21 18:16:44,596 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-21 18:16:44,596 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:44,596 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:44,596 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-21 18:16:44,597 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:44,597 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:44,597 INFO L82 PathProgramCache]: Analyzing trace with hash -1721734446, now seen corresponding path program 14 times [2020-08-21 18:16:44,597 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:44,597 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [504345625] [2020-08-21 18:16:44,597 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:44,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:44,875 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:44,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:44,884 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 0 proven. 315 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:44,884 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [504345625] [2020-08-21 18:16:44,886 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:44,887 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-21 18:16:44,887 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1805087100] [2020-08-21 18:16:44,887 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-21 18:16:44,888 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:44,888 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-21 18:16:44,888 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=307, Unknown=0, NotChecked=0, Total=342 [2020-08-21 18:16:44,888 INFO L87 Difference]: Start difference. First operand 55 states and 70 transitions. Second operand 19 states. [2020-08-21 18:16:45,280 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:45,280 INFO L93 Difference]: Finished difference Result 63 states and 79 transitions. [2020-08-21 18:16:45,281 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-21 18:16:45,281 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 54 [2020-08-21 18:16:45,281 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:45,282 INFO L225 Difference]: With dead ends: 63 [2020-08-21 18:16:45,282 INFO L226 Difference]: Without dead ends: 58 [2020-08-21 18:16:45,283 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=39, Invalid=341, Unknown=0, NotChecked=0, Total=380 [2020-08-21 18:16:45,284 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-21 18:16:45,296 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2020-08-21 18:16:45,297 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-08-21 18:16:45,299 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 74 transitions. [2020-08-21 18:16:45,299 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 74 transitions. Word has length 54 [2020-08-21 18:16:45,300 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:45,300 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 74 transitions. [2020-08-21 18:16:45,300 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-21 18:16:45,301 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 74 transitions. [2020-08-21 18:16:45,304 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-08-21 18:16:45,304 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:45,305 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:45,305 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-21 18:16:45,305 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:45,306 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:45,306 INFO L82 PathProgramCache]: Analyzing trace with hash 2131151561, now seen corresponding path program 15 times [2020-08-21 18:16:45,306 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:45,306 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1095550634] [2020-08-21 18:16:45,307 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:45,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:45,598 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:45,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:45,609 INFO L134 CoverageAnalysis]: Checked inductivity of 360 backedges. 0 proven. 360 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:45,610 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1095550634] [2020-08-21 18:16:45,610 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:45,610 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-21 18:16:45,611 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1967725469] [2020-08-21 18:16:45,611 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-21 18:16:45,612 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:45,612 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-21 18:16:45,613 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=343, Unknown=0, NotChecked=0, Total=380 [2020-08-21 18:16:45,613 INFO L87 Difference]: Start difference. First operand 58 states and 74 transitions. Second operand 20 states. [2020-08-21 18:16:46,044 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:46,044 INFO L93 Difference]: Finished difference Result 66 states and 83 transitions. [2020-08-21 18:16:46,044 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-21 18:16:46,044 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 57 [2020-08-21 18:16:46,045 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:46,045 INFO L225 Difference]: With dead ends: 66 [2020-08-21 18:16:46,045 INFO L226 Difference]: Without dead ends: 61 [2020-08-21 18:16:46,046 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=41, Invalid=379, Unknown=0, NotChecked=0, Total=420 [2020-08-21 18:16:46,046 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-08-21 18:16:46,051 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2020-08-21 18:16:46,051 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-08-21 18:16:46,051 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 78 transitions. [2020-08-21 18:16:46,052 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 78 transitions. Word has length 57 [2020-08-21 18:16:46,052 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:46,052 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 78 transitions. [2020-08-21 18:16:46,052 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-21 18:16:46,052 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 78 transitions. [2020-08-21 18:16:46,053 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2020-08-21 18:16:46,053 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:46,053 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:46,053 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-21 18:16:46,053 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:46,054 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:46,054 INFO L82 PathProgramCache]: Analyzing trace with hash 457200498, now seen corresponding path program 16 times [2020-08-21 18:16:46,054 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:46,054 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [613287803] [2020-08-21 18:16:46,055 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:46,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:46,343 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:46,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:46,351 INFO L134 CoverageAnalysis]: Checked inductivity of 408 backedges. 0 proven. 408 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:46,351 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [613287803] [2020-08-21 18:16:46,351 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:46,351 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-21 18:16:46,352 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1054045982] [2020-08-21 18:16:46,352 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-21 18:16:46,352 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:46,353 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-21 18:16:46,353 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=381, Unknown=0, NotChecked=0, Total=420 [2020-08-21 18:16:46,353 INFO L87 Difference]: Start difference. First operand 61 states and 78 transitions. Second operand 21 states. [2020-08-21 18:16:46,823 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:46,823 INFO L93 Difference]: Finished difference Result 69 states and 87 transitions. [2020-08-21 18:16:46,824 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-21 18:16:46,824 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 60 [2020-08-21 18:16:46,824 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:46,825 INFO L225 Difference]: With dead ends: 69 [2020-08-21 18:16:46,825 INFO L226 Difference]: Without dead ends: 64 [2020-08-21 18:16:46,826 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=43, Invalid=419, Unknown=0, NotChecked=0, Total=462 [2020-08-21 18:16:46,827 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-08-21 18:16:46,834 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2020-08-21 18:16:46,834 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-08-21 18:16:46,835 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 82 transitions. [2020-08-21 18:16:46,835 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 82 transitions. Word has length 60 [2020-08-21 18:16:46,835 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:46,835 INFO L479 AbstractCegarLoop]: Abstraction has 64 states and 82 transitions. [2020-08-21 18:16:46,836 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-21 18:16:46,836 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 82 transitions. [2020-08-21 18:16:46,836 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2020-08-21 18:16:46,836 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:46,837 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:46,837 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-21 18:16:46,837 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:46,837 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:46,837 INFO L82 PathProgramCache]: Analyzing trace with hash 646356521, now seen corresponding path program 17 times [2020-08-21 18:16:46,838 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:46,838 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1401604487] [2020-08-21 18:16:46,838 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:46,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:47,183 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:47,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:47,192 INFO L134 CoverageAnalysis]: Checked inductivity of 459 backedges. 0 proven. 459 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:47,192 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1401604487] [2020-08-21 18:16:47,192 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:47,192 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-21 18:16:47,193 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [786951678] [2020-08-21 18:16:47,193 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-21 18:16:47,193 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:47,193 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-21 18:16:47,194 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=421, Unknown=0, NotChecked=0, Total=462 [2020-08-21 18:16:47,194 INFO L87 Difference]: Start difference. First operand 64 states and 82 transitions. Second operand 22 states. [2020-08-21 18:16:47,699 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:47,699 INFO L93 Difference]: Finished difference Result 72 states and 91 transitions. [2020-08-21 18:16:47,701 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-21 18:16:47,701 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 63 [2020-08-21 18:16:47,702 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:47,702 INFO L225 Difference]: With dead ends: 72 [2020-08-21 18:16:47,702 INFO L226 Difference]: Without dead ends: 67 [2020-08-21 18:16:47,703 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=45, Invalid=461, Unknown=0, NotChecked=0, Total=506 [2020-08-21 18:16:47,703 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2020-08-21 18:16:47,710 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2020-08-21 18:16:47,710 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-08-21 18:16:47,711 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 86 transitions. [2020-08-21 18:16:47,711 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 86 transitions. Word has length 63 [2020-08-21 18:16:47,711 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:47,712 INFO L479 AbstractCegarLoop]: Abstraction has 67 states and 86 transitions. [2020-08-21 18:16:47,712 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-21 18:16:47,712 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 86 transitions. [2020-08-21 18:16:47,712 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2020-08-21 18:16:47,712 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:47,713 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:47,713 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-21 18:16:47,713 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:47,713 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:47,713 INFO L82 PathProgramCache]: Analyzing trace with hash 796345362, now seen corresponding path program 18 times [2020-08-21 18:16:47,714 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:47,714 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [232834257] [2020-08-21 18:16:47,714 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:47,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:48,073 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:48,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:48,081 INFO L134 CoverageAnalysis]: Checked inductivity of 513 backedges. 0 proven. 513 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:48,082 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [232834257] [2020-08-21 18:16:48,082 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:48,082 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-21 18:16:48,082 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [590289386] [2020-08-21 18:16:48,083 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-21 18:16:48,083 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:48,083 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-21 18:16:48,084 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=463, Unknown=0, NotChecked=0, Total=506 [2020-08-21 18:16:48,084 INFO L87 Difference]: Start difference. First operand 67 states and 86 transitions. Second operand 23 states. [2020-08-21 18:16:48,653 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:48,654 INFO L93 Difference]: Finished difference Result 75 states and 95 transitions. [2020-08-21 18:16:48,654 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-21 18:16:48,654 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 66 [2020-08-21 18:16:48,655 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:48,655 INFO L225 Difference]: With dead ends: 75 [2020-08-21 18:16:48,655 INFO L226 Difference]: Without dead ends: 70 [2020-08-21 18:16:48,656 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=47, Invalid=505, Unknown=0, NotChecked=0, Total=552 [2020-08-21 18:16:48,657 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-08-21 18:16:48,668 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2020-08-21 18:16:48,669 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-08-21 18:16:48,669 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 90 transitions. [2020-08-21 18:16:48,669 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 90 transitions. Word has length 66 [2020-08-21 18:16:48,670 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:48,670 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 90 transitions. [2020-08-21 18:16:48,670 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-21 18:16:48,670 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 90 transitions. [2020-08-21 18:16:48,670 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-08-21 18:16:48,670 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:48,671 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:48,671 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-21 18:16:48,671 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:48,671 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:48,671 INFO L82 PathProgramCache]: Analyzing trace with hash -1947047543, now seen corresponding path program 19 times [2020-08-21 18:16:48,672 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:48,672 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1990147145] [2020-08-21 18:16:48,672 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:48,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:49,051 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:49,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:49,062 INFO L134 CoverageAnalysis]: Checked inductivity of 570 backedges. 0 proven. 570 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:49,062 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1990147145] [2020-08-21 18:16:49,063 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:49,063 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-21 18:16:49,063 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1902986204] [2020-08-21 18:16:49,063 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-21 18:16:49,063 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:49,064 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-21 18:16:49,064 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=507, Unknown=0, NotChecked=0, Total=552 [2020-08-21 18:16:49,064 INFO L87 Difference]: Start difference. First operand 70 states and 90 transitions. Second operand 24 states. [2020-08-21 18:16:49,693 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:49,694 INFO L93 Difference]: Finished difference Result 78 states and 99 transitions. [2020-08-21 18:16:49,694 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-21 18:16:49,694 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 69 [2020-08-21 18:16:49,694 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:49,695 INFO L225 Difference]: With dead ends: 78 [2020-08-21 18:16:49,695 INFO L226 Difference]: Without dead ends: 73 [2020-08-21 18:16:49,696 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=49, Invalid=551, Unknown=0, NotChecked=0, Total=600 [2020-08-21 18:16:49,696 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-08-21 18:16:49,700 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 73. [2020-08-21 18:16:49,700 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-08-21 18:16:49,701 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 94 transitions. [2020-08-21 18:16:49,701 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 94 transitions. Word has length 69 [2020-08-21 18:16:49,701 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:49,701 INFO L479 AbstractCegarLoop]: Abstraction has 73 states and 94 transitions. [2020-08-21 18:16:49,701 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-21 18:16:49,701 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 94 transitions. [2020-08-21 18:16:49,701 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2020-08-21 18:16:49,702 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:49,702 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:49,702 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-21 18:16:49,702 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:49,702 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:49,702 INFO L82 PathProgramCache]: Analyzing trace with hash -1432404814, now seen corresponding path program 20 times [2020-08-21 18:16:49,702 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:49,703 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [61694642] [2020-08-21 18:16:49,703 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:49,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:50,151 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:50,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:50,161 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:50,161 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [61694642] [2020-08-21 18:16:50,161 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:50,161 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-21 18:16:50,162 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2024472803] [2020-08-21 18:16:50,162 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-21 18:16:50,162 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:50,162 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-21 18:16:50,163 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=553, Unknown=0, NotChecked=0, Total=600 [2020-08-21 18:16:50,163 INFO L87 Difference]: Start difference. First operand 73 states and 94 transitions. Second operand 25 states. [2020-08-21 18:16:50,841 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:50,842 INFO L93 Difference]: Finished difference Result 81 states and 103 transitions. [2020-08-21 18:16:50,844 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-21 18:16:50,845 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 72 [2020-08-21 18:16:50,845 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:50,845 INFO L225 Difference]: With dead ends: 81 [2020-08-21 18:16:50,846 INFO L226 Difference]: Without dead ends: 76 [2020-08-21 18:16:50,846 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=51, Invalid=599, Unknown=0, NotChecked=0, Total=650 [2020-08-21 18:16:50,847 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-08-21 18:16:50,852 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 76. [2020-08-21 18:16:50,852 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-08-21 18:16:50,853 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 98 transitions. [2020-08-21 18:16:50,854 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 98 transitions. Word has length 72 [2020-08-21 18:16:50,854 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:50,854 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 98 transitions. [2020-08-21 18:16:50,854 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-21 18:16:50,854 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 98 transitions. [2020-08-21 18:16:50,855 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2020-08-21 18:16:50,855 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:50,855 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:50,855 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-21 18:16:50,855 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:50,856 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:50,856 INFO L82 PathProgramCache]: Analyzing trace with hash 1550855401, now seen corresponding path program 21 times [2020-08-21 18:16:50,856 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:50,856 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1940724636] [2020-08-21 18:16:50,856 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:50,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:51,314 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:51,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:51,326 INFO L134 CoverageAnalysis]: Checked inductivity of 693 backedges. 0 proven. 693 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:51,331 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1940724636] [2020-08-21 18:16:51,331 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:51,331 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-21 18:16:51,335 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1085353599] [2020-08-21 18:16:51,336 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-21 18:16:51,339 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:51,339 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-21 18:16:51,340 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=601, Unknown=0, NotChecked=0, Total=650 [2020-08-21 18:16:51,340 INFO L87 Difference]: Start difference. First operand 76 states and 98 transitions. Second operand 26 states. [2020-08-21 18:16:52,058 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:52,059 INFO L93 Difference]: Finished difference Result 84 states and 107 transitions. [2020-08-21 18:16:52,059 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-21 18:16:52,059 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 75 [2020-08-21 18:16:52,059 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:52,060 INFO L225 Difference]: With dead ends: 84 [2020-08-21 18:16:52,060 INFO L226 Difference]: Without dead ends: 79 [2020-08-21 18:16:52,061 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=53, Invalid=649, Unknown=0, NotChecked=0, Total=702 [2020-08-21 18:16:52,062 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2020-08-21 18:16:52,068 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2020-08-21 18:16:52,068 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-08-21 18:16:52,069 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 102 transitions. [2020-08-21 18:16:52,069 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 102 transitions. Word has length 75 [2020-08-21 18:16:52,069 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:52,069 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 102 transitions. [2020-08-21 18:16:52,069 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-21 18:16:52,069 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 102 transitions. [2020-08-21 18:16:52,070 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-08-21 18:16:52,070 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:52,070 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:52,070 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-21 18:16:52,071 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:52,071 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:52,071 INFO L82 PathProgramCache]: Analyzing trace with hash 97664338, now seen corresponding path program 22 times [2020-08-21 18:16:52,071 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:52,071 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1420365521] [2020-08-21 18:16:52,071 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:52,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:52,494 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:52,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:52,509 INFO L134 CoverageAnalysis]: Checked inductivity of 759 backedges. 0 proven. 759 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:52,509 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1420365521] [2020-08-21 18:16:52,510 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:52,510 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-21 18:16:52,510 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [481261682] [2020-08-21 18:16:52,510 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-21 18:16:52,510 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:52,511 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-21 18:16:52,512 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=651, Unknown=0, NotChecked=0, Total=702 [2020-08-21 18:16:52,512 INFO L87 Difference]: Start difference. First operand 79 states and 102 transitions. Second operand 27 states. [2020-08-21 18:16:53,204 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:53,204 INFO L93 Difference]: Finished difference Result 87 states and 111 transitions. [2020-08-21 18:16:53,204 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-21 18:16:53,205 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 78 [2020-08-21 18:16:53,205 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:53,206 INFO L225 Difference]: With dead ends: 87 [2020-08-21 18:16:53,206 INFO L226 Difference]: Without dead ends: 82 [2020-08-21 18:16:53,207 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=55, Invalid=701, Unknown=0, NotChecked=0, Total=756 [2020-08-21 18:16:53,207 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-08-21 18:16:53,217 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 82. [2020-08-21 18:16:53,217 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2020-08-21 18:16:53,218 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 106 transitions. [2020-08-21 18:16:53,218 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 106 transitions. Word has length 78 [2020-08-21 18:16:53,218 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:53,218 INFO L479 AbstractCegarLoop]: Abstraction has 82 states and 106 transitions. [2020-08-21 18:16:53,219 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-21 18:16:53,219 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 106 transitions. [2020-08-21 18:16:53,219 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2020-08-21 18:16:53,219 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:53,219 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:53,221 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-21 18:16:53,223 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:53,223 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:53,223 INFO L82 PathProgramCache]: Analyzing trace with hash 1353050185, now seen corresponding path program 23 times [2020-08-21 18:16:53,223 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:53,223 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [161721903] [2020-08-21 18:16:53,224 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:53,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:53,723 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:53,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:53,736 INFO L134 CoverageAnalysis]: Checked inductivity of 828 backedges. 0 proven. 828 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:53,736 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [161721903] [2020-08-21 18:16:53,736 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:53,736 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-21 18:16:53,737 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [877667357] [2020-08-21 18:16:53,738 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-21 18:16:53,738 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:53,738 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-21 18:16:53,738 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=703, Unknown=0, NotChecked=0, Total=756 [2020-08-21 18:16:53,739 INFO L87 Difference]: Start difference. First operand 82 states and 106 transitions. Second operand 28 states. [2020-08-21 18:16:54,604 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:54,604 INFO L93 Difference]: Finished difference Result 90 states and 115 transitions. [2020-08-21 18:16:54,605 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-21 18:16:54,605 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 81 [2020-08-21 18:16:54,605 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:54,606 INFO L225 Difference]: With dead ends: 90 [2020-08-21 18:16:54,606 INFO L226 Difference]: Without dead ends: 85 [2020-08-21 18:16:54,607 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=57, Invalid=755, Unknown=0, NotChecked=0, Total=812 [2020-08-21 18:16:54,607 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2020-08-21 18:16:54,614 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 85. [2020-08-21 18:16:54,614 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2020-08-21 18:16:54,615 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 110 transitions. [2020-08-21 18:16:54,615 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 110 transitions. Word has length 81 [2020-08-21 18:16:54,615 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:54,615 INFO L479 AbstractCegarLoop]: Abstraction has 85 states and 110 transitions. [2020-08-21 18:16:54,616 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-21 18:16:54,616 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 110 transitions. [2020-08-21 18:16:54,620 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2020-08-21 18:16:54,620 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:54,620 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:54,620 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-21 18:16:54,620 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:54,621 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:54,621 INFO L82 PathProgramCache]: Analyzing trace with hash -22395406, now seen corresponding path program 24 times [2020-08-21 18:16:54,621 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:54,621 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1857556013] [2020-08-21 18:16:54,621 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:54,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:55,384 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:55,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:55,414 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:55,414 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1857556013] [2020-08-21 18:16:55,415 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:55,415 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-21 18:16:55,415 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1581395663] [2020-08-21 18:16:55,417 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-21 18:16:55,417 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:55,417 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-21 18:16:55,418 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=757, Unknown=0, NotChecked=0, Total=812 [2020-08-21 18:16:55,418 INFO L87 Difference]: Start difference. First operand 85 states and 110 transitions. Second operand 29 states. [2020-08-21 18:16:56,307 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:56,307 INFO L93 Difference]: Finished difference Result 93 states and 119 transitions. [2020-08-21 18:16:56,307 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-21 18:16:56,308 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 84 [2020-08-21 18:16:56,308 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:56,308 INFO L225 Difference]: With dead ends: 93 [2020-08-21 18:16:56,309 INFO L226 Difference]: Without dead ends: 88 [2020-08-21 18:16:56,309 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=59, Invalid=811, Unknown=0, NotChecked=0, Total=870 [2020-08-21 18:16:56,309 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-08-21 18:16:56,314 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 88. [2020-08-21 18:16:56,314 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2020-08-21 18:16:56,315 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 114 transitions. [2020-08-21 18:16:56,315 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 114 transitions. Word has length 84 [2020-08-21 18:16:56,315 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:56,315 INFO L479 AbstractCegarLoop]: Abstraction has 88 states and 114 transitions. [2020-08-21 18:16:56,315 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-21 18:16:56,315 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 114 transitions. [2020-08-21 18:16:56,316 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2020-08-21 18:16:56,316 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:56,316 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:56,317 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-21 18:16:56,317 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:56,317 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:56,317 INFO L82 PathProgramCache]: Analyzing trace with hash -1933993047, now seen corresponding path program 25 times [2020-08-21 18:16:56,317 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:56,317 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1668707000] [2020-08-21 18:16:56,318 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:56,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:56,925 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:56,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:56,938 INFO L134 CoverageAnalysis]: Checked inductivity of 975 backedges. 0 proven. 975 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:56,938 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1668707000] [2020-08-21 18:16:56,939 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:56,939 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-21 18:16:56,939 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1469854317] [2020-08-21 18:16:56,939 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-21 18:16:56,940 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:56,940 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-21 18:16:56,940 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=813, Unknown=0, NotChecked=0, Total=870 [2020-08-21 18:16:56,940 INFO L87 Difference]: Start difference. First operand 88 states and 114 transitions. Second operand 30 states. [2020-08-21 18:16:57,925 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:57,926 INFO L93 Difference]: Finished difference Result 96 states and 123 transitions. [2020-08-21 18:16:57,926 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-21 18:16:57,926 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 87 [2020-08-21 18:16:57,927 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:57,928 INFO L225 Difference]: With dead ends: 96 [2020-08-21 18:16:57,928 INFO L226 Difference]: Without dead ends: 91 [2020-08-21 18:16:57,929 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=61, Invalid=869, Unknown=0, NotChecked=0, Total=930 [2020-08-21 18:16:57,930 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2020-08-21 18:16:57,936 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 91. [2020-08-21 18:16:57,937 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2020-08-21 18:16:57,937 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 118 transitions. [2020-08-21 18:16:57,937 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 118 transitions. Word has length 87 [2020-08-21 18:16:57,938 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:57,938 INFO L479 AbstractCegarLoop]: Abstraction has 91 states and 118 transitions. [2020-08-21 18:16:57,938 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-21 18:16:57,938 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 118 transitions. [2020-08-21 18:16:57,939 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2020-08-21 18:16:57,939 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:57,939 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:57,939 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-21 18:16:57,939 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:57,940 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:57,940 INFO L82 PathProgramCache]: Analyzing trace with hash 927028882, now seen corresponding path program 26 times [2020-08-21 18:16:57,940 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:57,940 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1477825082] [2020-08-21 18:16:57,940 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:57,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:58,570 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:58,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:58,584 INFO L134 CoverageAnalysis]: Checked inductivity of 1053 backedges. 0 proven. 1053 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:58,585 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1477825082] [2020-08-21 18:16:58,585 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:58,585 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-21 18:16:58,585 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1355637981] [2020-08-21 18:16:58,586 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-21 18:16:58,586 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:58,586 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-21 18:16:58,586 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=871, Unknown=0, NotChecked=0, Total=930 [2020-08-21 18:16:58,586 INFO L87 Difference]: Start difference. First operand 91 states and 118 transitions. Second operand 31 states. [2020-08-21 18:16:59,632 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:59,632 INFO L93 Difference]: Finished difference Result 99 states and 127 transitions. [2020-08-21 18:16:59,632 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-21 18:16:59,633 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 90 [2020-08-21 18:16:59,633 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:59,634 INFO L225 Difference]: With dead ends: 99 [2020-08-21 18:16:59,634 INFO L226 Difference]: Without dead ends: 94 [2020-08-21 18:16:59,635 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=63, Invalid=929, Unknown=0, NotChecked=0, Total=992 [2020-08-21 18:16:59,635 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2020-08-21 18:16:59,641 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 94. [2020-08-21 18:16:59,642 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 94 states. [2020-08-21 18:16:59,642 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 122 transitions. [2020-08-21 18:16:59,643 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 122 transitions. Word has length 90 [2020-08-21 18:16:59,643 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:59,643 INFO L479 AbstractCegarLoop]: Abstraction has 94 states and 122 transitions. [2020-08-21 18:16:59,643 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-21 18:16:59,643 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 122 transitions. [2020-08-21 18:16:59,644 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2020-08-21 18:16:59,644 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:59,644 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:59,644 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-21 18:16:59,645 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:59,645 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:59,645 INFO L82 PathProgramCache]: Analyzing trace with hash 5326601, now seen corresponding path program 27 times [2020-08-21 18:16:59,645 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:59,645 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1814147933] [2020-08-21 18:16:59,645 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:59,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:17:00,377 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:17:00,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:17:00,391 INFO L134 CoverageAnalysis]: Checked inductivity of 1134 backedges. 0 proven. 1134 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:17:00,392 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1814147933] [2020-08-21 18:17:00,392 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:17:00,392 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-21 18:17:00,392 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [828741398] [2020-08-21 18:17:00,392 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-21 18:17:00,392 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:17:00,392 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-21 18:17:00,393 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=931, Unknown=0, NotChecked=0, Total=992 [2020-08-21 18:17:00,393 INFO L87 Difference]: Start difference. First operand 94 states and 122 transitions. Second operand 32 states. [2020-08-21 18:17:01,521 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:17:01,522 INFO L93 Difference]: Finished difference Result 102 states and 131 transitions. [2020-08-21 18:17:01,522 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-21 18:17:01,522 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 93 [2020-08-21 18:17:01,523 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:17:01,524 INFO L225 Difference]: With dead ends: 102 [2020-08-21 18:17:01,524 INFO L226 Difference]: Without dead ends: 97 [2020-08-21 18:17:01,525 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=65, Invalid=991, Unknown=0, NotChecked=0, Total=1056 [2020-08-21 18:17:01,526 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2020-08-21 18:17:01,533 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 97. [2020-08-21 18:17:01,533 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2020-08-21 18:17:01,533 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 126 transitions. [2020-08-21 18:17:01,534 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 126 transitions. Word has length 93 [2020-08-21 18:17:01,534 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:17:01,534 INFO L479 AbstractCegarLoop]: Abstraction has 97 states and 126 transitions. [2020-08-21 18:17:01,534 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-21 18:17:01,534 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 126 transitions. [2020-08-21 18:17:01,535 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-08-21 18:17:01,535 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:17:01,535 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:17:01,535 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-21 18:17:01,536 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:17:01,536 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:17:01,536 INFO L82 PathProgramCache]: Analyzing trace with hash -701403342, now seen corresponding path program 28 times [2020-08-21 18:17:01,536 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:17:01,536 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1839125587] [2020-08-21 18:17:01,536 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:17:01,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:17:02,373 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:17:02,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:17:02,410 INFO L134 CoverageAnalysis]: Checked inductivity of 1218 backedges. 0 proven. 1218 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:17:02,410 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1839125587] [2020-08-21 18:17:02,411 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:17:02,411 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-21 18:17:02,411 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [501821903] [2020-08-21 18:17:02,412 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-21 18:17:02,412 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:17:02,412 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-21 18:17:02,413 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=993, Unknown=0, NotChecked=0, Total=1056 [2020-08-21 18:17:02,413 INFO L87 Difference]: Start difference. First operand 97 states and 126 transitions. Second operand 33 states. [2020-08-21 18:17:03,815 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:17:03,816 INFO L93 Difference]: Finished difference Result 105 states and 135 transitions. [2020-08-21 18:17:03,817 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-21 18:17:03,817 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 96 [2020-08-21 18:17:03,817 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:17:03,818 INFO L225 Difference]: With dead ends: 105 [2020-08-21 18:17:03,818 INFO L226 Difference]: Without dead ends: 100 [2020-08-21 18:17:03,819 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=67, Invalid=1055, Unknown=0, NotChecked=0, Total=1122 [2020-08-21 18:17:03,819 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2020-08-21 18:17:03,826 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 100. [2020-08-21 18:17:03,826 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 100 states. [2020-08-21 18:17:03,827 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 130 transitions. [2020-08-21 18:17:03,827 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 130 transitions. Word has length 96 [2020-08-21 18:17:03,827 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:17:03,827 INFO L479 AbstractCegarLoop]: Abstraction has 100 states and 130 transitions. [2020-08-21 18:17:03,828 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-21 18:17:03,828 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 130 transitions. [2020-08-21 18:17:03,828 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2020-08-21 18:17:03,829 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:17:03,829 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:17:03,829 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-21 18:17:03,829 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:17:03,829 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:17:03,830 INFO L82 PathProgramCache]: Analyzing trace with hash -963450263, now seen corresponding path program 29 times [2020-08-21 18:17:03,830 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:17:03,830 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1960233311] [2020-08-21 18:17:03,830 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:17:03,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:17:04,612 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:17:04,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:17:04,636 INFO L134 CoverageAnalysis]: Checked inductivity of 1305 backedges. 0 proven. 1305 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:17:04,637 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1960233311] [2020-08-21 18:17:04,637 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:17:04,637 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-21 18:17:04,638 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1566233096] [2020-08-21 18:17:04,638 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-21 18:17:04,638 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:17:04,638 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-21 18:17:04,639 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=1057, Unknown=0, NotChecked=0, Total=1122 [2020-08-21 18:17:04,639 INFO L87 Difference]: Start difference. First operand 100 states and 130 transitions. Second operand 34 states. [2020-08-21 18:17:05,931 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:17:05,931 INFO L93 Difference]: Finished difference Result 108 states and 139 transitions. [2020-08-21 18:17:05,931 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-21 18:17:05,931 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 99 [2020-08-21 18:17:05,932 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:17:05,932 INFO L225 Difference]: With dead ends: 108 [2020-08-21 18:17:05,932 INFO L226 Difference]: Without dead ends: 103 [2020-08-21 18:17:05,933 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=69, Invalid=1121, Unknown=0, NotChecked=0, Total=1190 [2020-08-21 18:17:05,934 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2020-08-21 18:17:05,941 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103. [2020-08-21 18:17:05,941 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2020-08-21 18:17:05,942 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 134 transitions. [2020-08-21 18:17:05,942 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 134 transitions. Word has length 99 [2020-08-21 18:17:05,942 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:17:05,942 INFO L479 AbstractCegarLoop]: Abstraction has 103 states and 134 transitions. [2020-08-21 18:17:05,942 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-21 18:17:05,942 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 134 transitions. [2020-08-21 18:17:05,943 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2020-08-21 18:17:05,943 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:17:05,943 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:17:05,944 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-21 18:17:05,944 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:17:05,944 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:17:05,944 INFO L82 PathProgramCache]: Analyzing trace with hash 647270354, now seen corresponding path program 30 times [2020-08-21 18:17:05,944 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:17:05,945 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [61733224] [2020-08-21 18:17:05,945 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:17:05,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:17:06,768 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:17:06,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:17:06,791 INFO L134 CoverageAnalysis]: Checked inductivity of 1395 backedges. 0 proven. 1395 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:17:06,791 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [61733224] [2020-08-21 18:17:06,792 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:17:06,792 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-21 18:17:06,792 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [927324474] [2020-08-21 18:17:06,792 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-21 18:17:06,792 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:17:06,793 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-21 18:17:06,793 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=1123, Unknown=0, NotChecked=0, Total=1190 [2020-08-21 18:17:06,793 INFO L87 Difference]: Start difference. First operand 103 states and 134 transitions. Second operand 35 states. [2020-08-21 18:17:08,182 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:17:08,182 INFO L93 Difference]: Finished difference Result 111 states and 143 transitions. [2020-08-21 18:17:08,188 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-21 18:17:08,188 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 102 [2020-08-21 18:17:08,188 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:17:08,189 INFO L225 Difference]: With dead ends: 111 [2020-08-21 18:17:08,189 INFO L226 Difference]: Without dead ends: 106 [2020-08-21 18:17:08,190 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=71, Invalid=1189, Unknown=0, NotChecked=0, Total=1260 [2020-08-21 18:17:08,190 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2020-08-21 18:17:08,197 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 106. [2020-08-21 18:17:08,197 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106 states. [2020-08-21 18:17:08,198 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 138 transitions. [2020-08-21 18:17:08,198 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 138 transitions. Word has length 102 [2020-08-21 18:17:08,198 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:17:08,199 INFO L479 AbstractCegarLoop]: Abstraction has 106 states and 138 transitions. [2020-08-21 18:17:08,199 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-21 18:17:08,199 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 138 transitions. [2020-08-21 18:17:08,200 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2020-08-21 18:17:08,200 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:17:08,200 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:17:08,200 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-21 18:17:08,200 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:17:08,200 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:17:08,201 INFO L82 PathProgramCache]: Analyzing trace with hash -2044426807, now seen corresponding path program 31 times [2020-08-21 18:17:08,201 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:17:08,201 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [335107231] [2020-08-21 18:17:08,201 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:17:08,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:17:09,053 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:17:09,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:17:09,071 INFO L134 CoverageAnalysis]: Checked inductivity of 1488 backedges. 0 proven. 1488 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:17:09,071 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [335107231] [2020-08-21 18:17:09,071 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:17:09,072 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-21 18:17:09,072 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [298901528] [2020-08-21 18:17:09,072 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-21 18:17:09,072 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:17:09,072 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-21 18:17:09,073 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=1191, Unknown=0, NotChecked=0, Total=1260 [2020-08-21 18:17:09,073 INFO L87 Difference]: Start difference. First operand 106 states and 138 transitions. Second operand 36 states. [2020-08-21 18:17:10,549 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:17:10,549 INFO L93 Difference]: Finished difference Result 114 states and 147 transitions. [2020-08-21 18:17:10,550 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-21 18:17:10,550 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 105 [2020-08-21 18:17:10,551 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:17:10,551 INFO L225 Difference]: With dead ends: 114 [2020-08-21 18:17:10,552 INFO L226 Difference]: Without dead ends: 109 [2020-08-21 18:17:10,553 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=73, Invalid=1259, Unknown=0, NotChecked=0, Total=1332 [2020-08-21 18:17:10,553 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2020-08-21 18:17:10,561 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 109. [2020-08-21 18:17:10,561 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 109 states. [2020-08-21 18:17:10,562 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 142 transitions. [2020-08-21 18:17:10,562 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 142 transitions. Word has length 105 [2020-08-21 18:17:10,562 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:17:10,562 INFO L479 AbstractCegarLoop]: Abstraction has 109 states and 142 transitions. [2020-08-21 18:17:10,562 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-21 18:17:10,563 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 142 transitions. [2020-08-21 18:17:10,563 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2020-08-21 18:17:10,563 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:17:10,564 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:17:10,564 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-21 18:17:10,564 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:17:10,564 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:17:10,564 INFO L82 PathProgramCache]: Analyzing trace with hash 939833458, now seen corresponding path program 32 times [2020-08-21 18:17:10,564 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:17:10,565 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1711349959] [2020-08-21 18:17:10,565 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:17:10,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:17:11,469 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:17:11,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:17:11,496 INFO L134 CoverageAnalysis]: Checked inductivity of 1584 backedges. 0 proven. 1584 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:17:11,496 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1711349959] [2020-08-21 18:17:11,496 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:17:11,496 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-21 18:17:11,496 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1086133841] [2020-08-21 18:17:11,497 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-21 18:17:11,497 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:17:11,497 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-21 18:17:11,497 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=1261, Unknown=0, NotChecked=0, Total=1332 [2020-08-21 18:17:11,497 INFO L87 Difference]: Start difference. First operand 109 states and 142 transitions. Second operand 37 states. [2020-08-21 18:17:13,045 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:17:13,045 INFO L93 Difference]: Finished difference Result 117 states and 151 transitions. [2020-08-21 18:17:13,045 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-21 18:17:13,046 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 108 [2020-08-21 18:17:13,046 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:17:13,047 INFO L225 Difference]: With dead ends: 117 [2020-08-21 18:17:13,047 INFO L226 Difference]: Without dead ends: 112 [2020-08-21 18:17:13,048 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=75, Invalid=1331, Unknown=0, NotChecked=0, Total=1406 [2020-08-21 18:17:13,049 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2020-08-21 18:17:13,056 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 112. [2020-08-21 18:17:13,056 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 112 states. [2020-08-21 18:17:13,057 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 146 transitions. [2020-08-21 18:17:13,057 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 146 transitions. Word has length 108 [2020-08-21 18:17:13,058 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:17:13,058 INFO L479 AbstractCegarLoop]: Abstraction has 112 states and 146 transitions. [2020-08-21 18:17:13,058 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-21 18:17:13,058 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 146 transitions. [2020-08-21 18:17:13,059 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2020-08-21 18:17:13,059 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:17:13,059 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:17:13,059 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-21 18:17:13,059 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:17:13,060 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:17:13,060 INFO L82 PathProgramCache]: Analyzing trace with hash -785639127, now seen corresponding path program 33 times [2020-08-21 18:17:13,060 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:17:13,060 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [649813531] [2020-08-21 18:17:13,060 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:17:13,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:17:14,011 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:17:14,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:17:14,037 INFO L134 CoverageAnalysis]: Checked inductivity of 1683 backedges. 0 proven. 1683 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:17:14,037 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [649813531] [2020-08-21 18:17:14,038 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:17:14,038 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-21 18:17:14,038 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [762116273] [2020-08-21 18:17:14,038 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-21 18:17:14,038 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:17:14,039 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-21 18:17:14,039 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=1333, Unknown=0, NotChecked=0, Total=1406 [2020-08-21 18:17:14,039 INFO L87 Difference]: Start difference. First operand 112 states and 146 transitions. Second operand 38 states. [2020-08-21 18:17:15,715 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:17:15,715 INFO L93 Difference]: Finished difference Result 120 states and 155 transitions. [2020-08-21 18:17:15,716 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-21 18:17:15,716 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 111 [2020-08-21 18:17:15,716 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:17:15,717 INFO L225 Difference]: With dead ends: 120 [2020-08-21 18:17:15,717 INFO L226 Difference]: Without dead ends: 115 [2020-08-21 18:17:15,718 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=77, Invalid=1405, Unknown=0, NotChecked=0, Total=1482 [2020-08-21 18:17:15,719 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2020-08-21 18:17:15,727 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 115. [2020-08-21 18:17:15,727 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2020-08-21 18:17:15,734 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 150 transitions. [2020-08-21 18:17:15,734 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 150 transitions. Word has length 111 [2020-08-21 18:17:15,735 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:17:15,735 INFO L479 AbstractCegarLoop]: Abstraction has 115 states and 150 transitions. [2020-08-21 18:17:15,735 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-21 18:17:15,735 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 150 transitions. [2020-08-21 18:17:15,736 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2020-08-21 18:17:15,736 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:17:15,736 INFO L422 BasicCegarLoop]: trace histogram [35, 35, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:17:15,736 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-21 18:17:15,737 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:17:15,737 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:17:15,737 INFO L82 PathProgramCache]: Analyzing trace with hash 2124146962, now seen corresponding path program 34 times [2020-08-21 18:17:15,737 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:17:15,737 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1250576392] [2020-08-21 18:17:15,738 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:17:15,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:17:16,676 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:17:16,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:17:16,696 INFO L134 CoverageAnalysis]: Checked inductivity of 1785 backedges. 0 proven. 1785 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:17:16,696 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1250576392] [2020-08-21 18:17:16,696 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:17:16,696 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-21 18:17:16,696 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1103167586] [2020-08-21 18:17:16,697 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-21 18:17:16,697 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:17:16,697 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-21 18:17:16,698 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=1407, Unknown=0, NotChecked=0, Total=1482 [2020-08-21 18:17:16,698 INFO L87 Difference]: Start difference. First operand 115 states and 150 transitions. Second operand 39 states. [2020-08-21 18:17:18,477 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:17:18,478 INFO L93 Difference]: Finished difference Result 123 states and 159 transitions. [2020-08-21 18:17:18,478 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-21 18:17:18,478 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 114 [2020-08-21 18:17:18,479 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:17:18,480 INFO L225 Difference]: With dead ends: 123 [2020-08-21 18:17:18,480 INFO L226 Difference]: Without dead ends: 118 [2020-08-21 18:17:18,481 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=79, Invalid=1481, Unknown=0, NotChecked=0, Total=1560 [2020-08-21 18:17:18,481 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2020-08-21 18:17:18,490 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 118. [2020-08-21 18:17:18,490 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 118 states. [2020-08-21 18:17:18,490 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 154 transitions. [2020-08-21 18:17:18,491 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 154 transitions. Word has length 114 [2020-08-21 18:17:18,491 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:17:18,491 INFO L479 AbstractCegarLoop]: Abstraction has 118 states and 154 transitions. [2020-08-21 18:17:18,491 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-21 18:17:18,491 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 154 transitions. [2020-08-21 18:17:18,492 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-08-21 18:17:18,492 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:17:18,492 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:17:18,493 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-21 18:17:18,493 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:17:18,493 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:17:18,493 INFO L82 PathProgramCache]: Analyzing trace with hash -2058378103, now seen corresponding path program 35 times [2020-08-21 18:17:18,493 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:17:18,493 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2094927219] [2020-08-21 18:17:18,493 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:17:18,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:17:19,551 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:17:19,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:17:19,578 INFO L134 CoverageAnalysis]: Checked inductivity of 1890 backedges. 0 proven. 1890 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:17:19,578 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2094927219] [2020-08-21 18:17:19,578 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:17:19,578 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-21 18:17:19,578 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [691947014] [2020-08-21 18:17:19,579 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-21 18:17:19,579 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:17:19,579 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-21 18:17:19,580 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=1483, Unknown=0, NotChecked=0, Total=1560 [2020-08-21 18:17:19,581 INFO L87 Difference]: Start difference. First operand 118 states and 154 transitions. Second operand 40 states. [2020-08-21 18:17:21,465 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:17:21,466 INFO L93 Difference]: Finished difference Result 126 states and 163 transitions. [2020-08-21 18:17:21,466 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-21 18:17:21,466 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 117 [2020-08-21 18:17:21,467 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:17:21,468 INFO L225 Difference]: With dead ends: 126 [2020-08-21 18:17:21,468 INFO L226 Difference]: Without dead ends: 121 [2020-08-21 18:17:21,469 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=81, Invalid=1559, Unknown=0, NotChecked=0, Total=1640 [2020-08-21 18:17:21,469 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2020-08-21 18:17:21,478 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 121. [2020-08-21 18:17:21,479 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 121 states. [2020-08-21 18:17:21,479 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 158 transitions. [2020-08-21 18:17:21,480 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 158 transitions. Word has length 117 [2020-08-21 18:17:21,480 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:17:21,480 INFO L479 AbstractCegarLoop]: Abstraction has 121 states and 158 transitions. [2020-08-21 18:17:21,480 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-21 18:17:21,480 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 158 transitions. [2020-08-21 18:17:21,481 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2020-08-21 18:17:21,481 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:17:21,481 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:17:21,481 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-21 18:17:21,482 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:17:21,482 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:17:21,482 INFO L82 PathProgramCache]: Analyzing trace with hash 1928602034, now seen corresponding path program 36 times [2020-08-21 18:17:21,482 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:17:21,482 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1642628411] [2020-08-21 18:17:21,482 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:17:21,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:17:22,620 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:17:22,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:17:22,642 INFO L134 CoverageAnalysis]: Checked inductivity of 1998 backedges. 0 proven. 1998 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:17:22,642 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1642628411] [2020-08-21 18:17:22,642 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:17:22,642 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-21 18:17:22,643 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [605678320] [2020-08-21 18:17:22,643 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-21 18:17:22,643 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:17:22,643 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-21 18:17:22,644 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=1561, Unknown=0, NotChecked=0, Total=1640 [2020-08-21 18:17:22,644 INFO L87 Difference]: Start difference. First operand 121 states and 158 transitions. Second operand 41 states. [2020-08-21 18:17:24,635 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:17:24,635 INFO L93 Difference]: Finished difference Result 129 states and 167 transitions. [2020-08-21 18:17:24,636 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-21 18:17:24,636 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 120 [2020-08-21 18:17:24,636 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:17:24,637 INFO L225 Difference]: With dead ends: 129 [2020-08-21 18:17:24,637 INFO L226 Difference]: Without dead ends: 124 [2020-08-21 18:17:24,638 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=83, Invalid=1639, Unknown=0, NotChecked=0, Total=1722 [2020-08-21 18:17:24,639 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2020-08-21 18:17:24,646 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 124. [2020-08-21 18:17:24,646 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 124 states. [2020-08-21 18:17:24,647 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 162 transitions. [2020-08-21 18:17:24,648 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 162 transitions. Word has length 120 [2020-08-21 18:17:24,648 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:17:24,648 INFO L479 AbstractCegarLoop]: Abstraction has 124 states and 162 transitions. [2020-08-21 18:17:24,648 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-21 18:17:24,648 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 162 transitions. [2020-08-21 18:17:24,649 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2020-08-21 18:17:24,649 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:17:24,649 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:17:24,649 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-21 18:17:24,649 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:17:24,650 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:17:24,650 INFO L82 PathProgramCache]: Analyzing trace with hash 733292521, now seen corresponding path program 37 times [2020-08-21 18:17:24,650 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:17:24,650 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [321400568] [2020-08-21 18:17:24,650 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:17:24,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:17:25,832 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:17:25,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:17:25,855 INFO L134 CoverageAnalysis]: Checked inductivity of 2109 backedges. 0 proven. 2109 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:17:25,855 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [321400568] [2020-08-21 18:17:25,855 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:17:25,855 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-21 18:17:25,855 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1105938890] [2020-08-21 18:17:25,856 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-21 18:17:25,856 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:17:25,856 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-21 18:17:25,857 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=1641, Unknown=0, NotChecked=0, Total=1722 [2020-08-21 18:17:25,857 INFO L87 Difference]: Start difference. First operand 124 states and 162 transitions. Second operand 42 states. [2020-08-21 18:17:27,953 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:17:27,954 INFO L93 Difference]: Finished difference Result 132 states and 171 transitions. [2020-08-21 18:17:27,954 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-21 18:17:27,954 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 123 [2020-08-21 18:17:27,955 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:17:27,956 INFO L225 Difference]: With dead ends: 132 [2020-08-21 18:17:27,956 INFO L226 Difference]: Without dead ends: 127 [2020-08-21 18:17:27,957 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=85, Invalid=1721, Unknown=0, NotChecked=0, Total=1806 [2020-08-21 18:17:27,958 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2020-08-21 18:17:27,968 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 127. [2020-08-21 18:17:27,968 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 127 states. [2020-08-21 18:17:27,969 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 166 transitions. [2020-08-21 18:17:27,969 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 166 transitions. Word has length 123 [2020-08-21 18:17:27,969 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:17:27,969 INFO L479 AbstractCegarLoop]: Abstraction has 127 states and 166 transitions. [2020-08-21 18:17:27,970 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-21 18:17:27,970 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 166 transitions. [2020-08-21 18:17:27,970 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2020-08-21 18:17:27,970 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:17:27,971 INFO L422 BasicCegarLoop]: trace histogram [39, 39, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:17:27,971 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-21 18:17:27,971 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:17:27,971 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:17:27,971 INFO L82 PathProgramCache]: Analyzing trace with hash 841441874, now seen corresponding path program 38 times [2020-08-21 18:17:27,971 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:17:27,972 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [158506388] [2020-08-21 18:17:27,972 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:17:28,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:17:29,347 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:17:29,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:17:29,371 INFO L134 CoverageAnalysis]: Checked inductivity of 2223 backedges. 0 proven. 2223 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:17:29,372 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [158506388] [2020-08-21 18:17:29,372 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:17:29,372 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-21 18:17:29,372 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [561883921] [2020-08-21 18:17:29,372 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-21 18:17:29,372 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:17:29,373 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-21 18:17:29,373 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=1723, Unknown=0, NotChecked=0, Total=1806 [2020-08-21 18:17:29,373 INFO L87 Difference]: Start difference. First operand 127 states and 166 transitions. Second operand 43 states. [2020-08-21 18:17:31,608 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:17:31,608 INFO L93 Difference]: Finished difference Result 135 states and 175 transitions. [2020-08-21 18:17:31,609 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-08-21 18:17:31,609 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 126 [2020-08-21 18:17:31,610 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:17:31,610 INFO L225 Difference]: With dead ends: 135 [2020-08-21 18:17:31,611 INFO L226 Difference]: Without dead ends: 130 [2020-08-21 18:17:31,612 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=87, Invalid=1805, Unknown=0, NotChecked=0, Total=1892 [2020-08-21 18:17:31,612 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2020-08-21 18:17:31,622 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 130. [2020-08-21 18:17:31,622 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 130 states. [2020-08-21 18:17:31,623 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 170 transitions. [2020-08-21 18:17:31,623 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 170 transitions. Word has length 126 [2020-08-21 18:17:31,624 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:17:31,624 INFO L479 AbstractCegarLoop]: Abstraction has 130 states and 170 transitions. [2020-08-21 18:17:31,624 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-21 18:17:31,624 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 170 transitions. [2020-08-21 18:17:31,625 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2020-08-21 18:17:31,625 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:17:31,625 INFO L422 BasicCegarLoop]: trace histogram [40, 40, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:17:31,625 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-21 18:17:31,625 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:17:31,625 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:17:31,626 INFO L82 PathProgramCache]: Analyzing trace with hash 1493345097, now seen corresponding path program 39 times [2020-08-21 18:17:31,626 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:17:31,626 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1978021206] [2020-08-21 18:17:31,626 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:17:31,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:17:32,965 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:17:32,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:17:32,990 INFO L134 CoverageAnalysis]: Checked inductivity of 2340 backedges. 0 proven. 2340 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:17:32,990 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1978021206] [2020-08-21 18:17:32,991 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:17:32,991 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44] total 44 [2020-08-21 18:17:32,991 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1769398713] [2020-08-21 18:17:32,991 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-08-21 18:17:32,991 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:17:32,991 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-08-21 18:17:32,992 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=1807, Unknown=0, NotChecked=0, Total=1892 [2020-08-21 18:17:32,992 INFO L87 Difference]: Start difference. First operand 130 states and 170 transitions. Second operand 44 states. [2020-08-21 18:17:35,306 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:17:35,306 INFO L93 Difference]: Finished difference Result 138 states and 179 transitions. [2020-08-21 18:17:35,307 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-08-21 18:17:35,307 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 129 [2020-08-21 18:17:35,307 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:17:35,309 INFO L225 Difference]: With dead ends: 138 [2020-08-21 18:17:35,309 INFO L226 Difference]: Without dead ends: 133 [2020-08-21 18:17:35,310 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=89, Invalid=1891, Unknown=0, NotChecked=0, Total=1980 [2020-08-21 18:17:35,310 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2020-08-21 18:17:35,320 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 133. [2020-08-21 18:17:35,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 133 states. [2020-08-21 18:17:35,321 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 174 transitions. [2020-08-21 18:17:35,321 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 174 transitions. Word has length 129 [2020-08-21 18:17:35,322 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:17:35,322 INFO L479 AbstractCegarLoop]: Abstraction has 133 states and 174 transitions. [2020-08-21 18:17:35,322 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-08-21 18:17:35,322 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 174 transitions. [2020-08-21 18:17:35,323 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2020-08-21 18:17:35,323 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:17:35,323 INFO L422 BasicCegarLoop]: trace histogram [41, 41, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:17:35,323 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-21 18:17:35,323 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:17:35,324 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:17:35,324 INFO L82 PathProgramCache]: Analyzing trace with hash 500148978, now seen corresponding path program 40 times [2020-08-21 18:17:35,324 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:17:35,324 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [74956526] [2020-08-21 18:17:35,324 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:17:35,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:17:36,743 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:17:36,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:17:36,769 INFO L134 CoverageAnalysis]: Checked inductivity of 2460 backedges. 0 proven. 2460 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:17:36,769 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [74956526] [2020-08-21 18:17:36,769 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:17:36,769 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45] total 45 [2020-08-21 18:17:36,770 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1616409082] [2020-08-21 18:17:36,770 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2020-08-21 18:17:36,770 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:17:36,770 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2020-08-21 18:17:36,771 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=1893, Unknown=0, NotChecked=0, Total=1980 [2020-08-21 18:17:36,771 INFO L87 Difference]: Start difference. First operand 133 states and 174 transitions. Second operand 45 states.