/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5 --traceabstraction.additional.smt.options interpolation-heuristic=SMALLESTAMONGWIDE --traceabstraction.additional.smt.options tolerance=0.1 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-lit/afnp2014.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-19 03:42:38,007 INFO L177 SettingsManager]: Resetting all preferences to default values... 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[2020-08-19 03:42:38,056 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-19 03:42:38,068 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-19 03:42:38,069 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-19 03:42:38,073 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-19 03:42:38,075 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-19 03:42:38,077 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-19 03:42:38,078 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-19 03:42:38,080 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-19 03:42:38,081 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-19 03:42:38,084 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-19 03:42:38,087 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-19 03:42:38,088 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-19 03:42:38,090 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-19 03:42:38,091 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-19 03:42:38,093 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-19 03:42:38,099 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-19 03:42:38,102 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-19 03:42:38,103 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-19 03:42:38,105 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-19 03:42:38,106 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-19 03:42:38,110 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-19 03:42:38,120 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-19 03:42:38,121 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-19 03:42:38,123 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-19 03:42:38,124 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-19 03:42:38,163 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-19 03:42:38,164 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-19 03:42:38,166 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-19 03:42:38,166 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-19 03:42:38,167 INFO L138 SettingsManager]: * Use SBE=true [2020-08-19 03:42:38,167 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-19 03:42:38,167 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-19 03:42:38,167 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-19 03:42:38,167 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-19 03:42:38,168 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-19 03:42:38,169 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-19 03:42:38,169 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-19 03:42:38,169 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-19 03:42:38,170 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-19 03:42:38,170 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-19 03:42:38,170 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-19 03:42:38,170 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-19 03:42:38,171 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-19 03:42:38,171 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-19 03:42:38,171 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-19 03:42:38,171 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-19 03:42:38,171 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-19 03:42:38,172 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-19 03:42:38,172 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-19 03:42:38,172 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-19 03:42:38,172 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-19 03:42:38,172 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-19 03:42:38,173 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-19 03:42:38,173 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-19 03:42:38,173 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.1; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.1; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.1; [2020-08-19 03:42:38,497 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-19 03:42:38,510 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-19 03:42:38,513 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-19 03:42:38,514 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-19 03:42:38,515 INFO L275 PluginConnector]: CDTParser initialized [2020-08-19 03:42:38,515 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/afnp2014.i [2020-08-19 03:42:38,576 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/f6e05d3d4/33525b0a7efc40a881ce442610bdd31a/FLAG41284c469 [2020-08-19 03:42:39,042 INFO L306 CDTParser]: Found 1 translation units. [2020-08-19 03:42:39,043 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-lit/afnp2014.i [2020-08-19 03:42:39,050 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/f6e05d3d4/33525b0a7efc40a881ce442610bdd31a/FLAG41284c469 [2020-08-19 03:42:39,441 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/f6e05d3d4/33525b0a7efc40a881ce442610bdd31a [2020-08-19 03:42:39,449 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-19 03:42:39,451 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-19 03:42:39,452 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-19 03:42:39,453 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-19 03:42:39,457 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-19 03:42:39,458 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 03:42:39" (1/1) ... [2020-08-19 03:42:39,461 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@531a9e7d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 03:42:39, skipping insertion in model container [2020-08-19 03:42:39,461 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 03:42:39" (1/1) ... [2020-08-19 03:42:39,467 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-19 03:42:39,481 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-19 03:42:39,673 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-19 03:42:39,678 INFO L203 MainTranslator]: Completed pre-run [2020-08-19 03:42:39,694 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-19 03:42:39,706 INFO L208 MainTranslator]: Completed translation [2020-08-19 03:42:39,707 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 03:42:39 WrapperNode [2020-08-19 03:42:39,707 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-19 03:42:39,708 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-19 03:42:39,708 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-19 03:42:39,708 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-19 03:42:39,718 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 03:42:39" (1/1) ... [2020-08-19 03:42:39,719 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 03:42:39" (1/1) ... [2020-08-19 03:42:39,801 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 03:42:39" (1/1) ... [2020-08-19 03:42:39,803 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 03:42:39" (1/1) ... [2020-08-19 03:42:39,807 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 03:42:39" (1/1) ... [2020-08-19 03:42:39,812 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 03:42:39" (1/1) ... [2020-08-19 03:42:39,813 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 03:42:39" (1/1) ... [2020-08-19 03:42:39,815 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-19 03:42:39,815 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-19 03:42:39,815 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-19 03:42:39,815 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-19 03:42:39,816 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 03:42:39" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-19 03:42:39,874 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-19 03:42:39,875 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-19 03:42:39,875 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-08-19 03:42:39,875 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-19 03:42:39,875 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-19 03:42:39,875 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-19 03:42:39,875 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-19 03:42:39,876 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-08-19 03:42:39,876 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-19 03:42:39,876 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-19 03:42:39,876 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-19 03:42:39,876 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-19 03:42:39,876 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-19 03:42:40,056 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-19 03:42:40,056 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-19 03:42:40,061 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 03:42:40 BoogieIcfgContainer [2020-08-19 03:42:40,061 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-19 03:42:40,062 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-19 03:42:40,063 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-19 03:42:40,066 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-19 03:42:40,067 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.08 03:42:39" (1/3) ... [2020-08-19 03:42:40,068 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@79d1f9a7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 03:42:40, skipping insertion in model container [2020-08-19 03:42:40,068 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 03:42:39" (2/3) ... [2020-08-19 03:42:40,068 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@79d1f9a7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 03:42:40, skipping insertion in model container [2020-08-19 03:42:40,068 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 03:42:40" (3/3) ... [2020-08-19 03:42:40,070 INFO L109 eAbstractionObserver]: Analyzing ICFG afnp2014.i [2020-08-19 03:42:40,082 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-19 03:42:40,090 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-19 03:42:40,102 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-19 03:42:40,127 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-19 03:42:40,127 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-19 03:42:40,127 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-19 03:42:40,127 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-19 03:42:40,127 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-19 03:42:40,128 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-19 03:42:40,128 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-19 03:42:40,128 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-19 03:42:40,145 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-08-19 03:42:40,151 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-19 03:42:40,152 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:40,153 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:40,153 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:40,160 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:40,160 INFO L82 PathProgramCache]: Analyzing trace with hash -1915647303, now seen corresponding path program 1 times [2020-08-19 03:42:40,169 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:40,169 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1855051674] [2020-08-19 03:42:40,169 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:40,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:40,270 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:40,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:40,276 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:40,277 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1855051674] [2020-08-19 03:42:40,280 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 03:42:40,280 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-08-19 03:42:40,281 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2080579274] [2020-08-19 03:42:40,286 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-08-19 03:42:40,286 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:40,298 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-08-19 03:42:40,299 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-19 03:42:40,302 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 2 states. [2020-08-19 03:42:40,328 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:40,328 INFO L93 Difference]: Finished difference Result 32 states and 36 transitions. [2020-08-19 03:42:40,329 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-08-19 03:42:40,330 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2020-08-19 03:42:40,331 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:40,339 INFO L225 Difference]: With dead ends: 32 [2020-08-19 03:42:40,340 INFO L226 Difference]: Without dead ends: 13 [2020-08-19 03:42:40,344 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 [2020-08-19 03:42:40,366 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-08-19 03:42:40,387 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-08-19 03:42:40,388 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-08-19 03:42:40,389 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2020-08-19 03:42:40,392 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 10 [2020-08-19 03:42:40,392 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:40,392 INFO L479 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2020-08-19 03:42:40,393 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-08-19 03:42:40,393 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2020-08-19 03:42:40,394 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-19 03:42:40,394 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:40,394 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:40,395 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-19 03:42:40,395 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:40,396 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:40,396 INFO L82 PathProgramCache]: Analyzing trace with hash 2084433522, now seen corresponding path program 1 times [2020-08-19 03:42:40,397 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:40,397 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [522531718] [2020-08-19 03:42:40,397 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:40,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:40,524 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:40,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:40,530 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:40,530 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [522531718] [2020-08-19 03:42:40,531 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 03:42:40,531 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-19 03:42:40,532 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [871112674] [2020-08-19 03:42:40,534 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-19 03:42:40,534 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:40,535 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-19 03:42:40,535 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-19 03:42:40,536 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand 5 states. [2020-08-19 03:42:40,711 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:40,711 INFO L93 Difference]: Finished difference Result 21 states and 23 transitions. [2020-08-19 03:42:40,712 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-19 03:42:40,713 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 12 [2020-08-19 03:42:40,713 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:40,714 INFO L225 Difference]: With dead ends: 21 [2020-08-19 03:42:40,714 INFO L226 Difference]: Without dead ends: 16 [2020-08-19 03:42:40,715 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-19 03:42:40,716 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-19 03:42:40,722 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-08-19 03:42:40,723 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-19 03:42:40,724 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2020-08-19 03:42:40,724 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 12 [2020-08-19 03:42:40,725 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:40,725 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2020-08-19 03:42:40,725 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-19 03:42:40,725 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2020-08-19 03:42:40,726 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-19 03:42:40,727 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:40,728 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:40,728 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-19 03:42:40,728 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:40,729 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:40,730 INFO L82 PathProgramCache]: Analyzing trace with hash 249504553, now seen corresponding path program 1 times [2020-08-19 03:42:40,730 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:40,731 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [296345481] [2020-08-19 03:42:40,731 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:40,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:40,895 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:40,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:40,900 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:40,901 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [296345481] [2020-08-19 03:42:40,901 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:40,901 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-19 03:42:40,908 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [682208732] [2020-08-19 03:42:40,908 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-19 03:42:40,908 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:40,911 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-19 03:42:40,911 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-08-19 03:42:40,911 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand 6 states. [2020-08-19 03:42:40,987 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:40,987 INFO L93 Difference]: Finished difference Result 24 states and 27 transitions. [2020-08-19 03:42:40,988 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-19 03:42:40,988 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 15 [2020-08-19 03:42:40,988 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:40,989 INFO L225 Difference]: With dead ends: 24 [2020-08-19 03:42:40,989 INFO L226 Difference]: Without dead ends: 19 [2020-08-19 03:42:40,990 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 [2020-08-19 03:42:40,990 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-08-19 03:42:40,994 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-08-19 03:42:40,994 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-08-19 03:42:40,995 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 22 transitions. [2020-08-19 03:42:40,995 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 22 transitions. Word has length 15 [2020-08-19 03:42:40,996 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:40,996 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 22 transitions. [2020-08-19 03:42:40,996 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-19 03:42:40,996 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 22 transitions. [2020-08-19 03:42:40,997 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-19 03:42:40,997 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:40,997 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:40,998 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-19 03:42:40,998 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:40,998 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:40,999 INFO L82 PathProgramCache]: Analyzing trace with hash -2070634734, now seen corresponding path program 2 times [2020-08-19 03:42:40,999 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:40,999 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [961801330] [2020-08-19 03:42:40,999 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:41,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:41,100 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:41,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:41,105 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:41,105 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [961801330] [2020-08-19 03:42:41,105 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:41,106 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-19 03:42:41,106 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [265836978] [2020-08-19 03:42:41,106 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-19 03:42:41,107 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:41,107 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-19 03:42:41,107 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-08-19 03:42:41,108 INFO L87 Difference]: Start difference. First operand 19 states and 22 transitions. Second operand 7 states. [2020-08-19 03:42:41,175 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:41,176 INFO L93 Difference]: Finished difference Result 27 states and 31 transitions. [2020-08-19 03:42:41,176 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-19 03:42:41,176 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 18 [2020-08-19 03:42:41,177 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:41,177 INFO L225 Difference]: With dead ends: 27 [2020-08-19 03:42:41,178 INFO L226 Difference]: Without dead ends: 22 [2020-08-19 03:42:41,178 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 [2020-08-19 03:42:41,179 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-19 03:42:41,183 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2020-08-19 03:42:41,183 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-08-19 03:42:41,184 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 26 transitions. [2020-08-19 03:42:41,185 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 26 transitions. Word has length 18 [2020-08-19 03:42:41,185 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:41,185 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 26 transitions. [2020-08-19 03:42:41,185 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-19 03:42:41,186 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 26 transitions. [2020-08-19 03:42:41,186 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-08-19 03:42:41,186 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:41,187 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:41,187 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-19 03:42:41,187 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:41,188 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:41,188 INFO L82 PathProgramCache]: Analyzing trace with hash 1863528073, now seen corresponding path program 3 times [2020-08-19 03:42:41,188 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:41,188 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1575390106] [2020-08-19 03:42:41,189 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:41,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:41,308 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:41,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:41,313 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:41,313 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1575390106] [2020-08-19 03:42:41,314 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:41,314 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-19 03:42:41,314 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1432361136] [2020-08-19 03:42:41,315 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-19 03:42:41,315 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:41,315 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-19 03:42:41,316 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2020-08-19 03:42:41,316 INFO L87 Difference]: Start difference. First operand 22 states and 26 transitions. Second operand 8 states. [2020-08-19 03:42:41,402 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:41,402 INFO L93 Difference]: Finished difference Result 30 states and 35 transitions. [2020-08-19 03:42:41,403 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-19 03:42:41,403 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 21 [2020-08-19 03:42:41,403 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:41,404 INFO L225 Difference]: With dead ends: 30 [2020-08-19 03:42:41,404 INFO L226 Difference]: Without dead ends: 25 [2020-08-19 03:42:41,405 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 [2020-08-19 03:42:41,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-19 03:42:41,410 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-08-19 03:42:41,410 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-19 03:42:41,411 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 30 transitions. [2020-08-19 03:42:41,411 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 30 transitions. Word has length 21 [2020-08-19 03:42:41,411 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:41,412 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 30 transitions. [2020-08-19 03:42:41,412 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-19 03:42:41,412 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 30 transitions. [2020-08-19 03:42:41,413 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-19 03:42:41,413 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:41,413 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:41,413 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-19 03:42:41,414 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:41,414 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:41,414 INFO L82 PathProgramCache]: Analyzing trace with hash -854829134, now seen corresponding path program 4 times [2020-08-19 03:42:41,414 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:41,415 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2066520242] [2020-08-19 03:42:41,415 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:41,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:41,542 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:41,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:41,549 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:41,550 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2066520242] [2020-08-19 03:42:41,550 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:41,550 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-19 03:42:41,550 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1757792329] [2020-08-19 03:42:41,551 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-19 03:42:41,551 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:41,551 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-19 03:42:41,552 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-08-19 03:42:41,552 INFO L87 Difference]: Start difference. First operand 25 states and 30 transitions. Second operand 9 states. [2020-08-19 03:42:41,672 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:41,672 INFO L93 Difference]: Finished difference Result 33 states and 39 transitions. [2020-08-19 03:42:41,673 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-19 03:42:41,673 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 24 [2020-08-19 03:42:41,673 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:41,674 INFO L225 Difference]: With dead ends: 33 [2020-08-19 03:42:41,674 INFO L226 Difference]: Without dead ends: 28 [2020-08-19 03:42:41,675 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 [2020-08-19 03:42:41,675 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-19 03:42:41,682 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-08-19 03:42:41,683 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-19 03:42:41,687 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 34 transitions. [2020-08-19 03:42:41,688 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 34 transitions. Word has length 24 [2020-08-19 03:42:41,688 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:41,688 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 34 transitions. [2020-08-19 03:42:41,688 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-19 03:42:41,689 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 34 transitions. [2020-08-19 03:42:41,691 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-19 03:42:41,691 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:41,691 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:41,691 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-19 03:42:41,692 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:41,692 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:41,692 INFO L82 PathProgramCache]: Analyzing trace with hash -1826016791, now seen corresponding path program 5 times [2020-08-19 03:42:41,693 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:41,693 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1947503328] [2020-08-19 03:42:41,693 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:41,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:41,831 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:41,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:41,835 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:41,835 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1947503328] [2020-08-19 03:42:41,835 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:41,836 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-19 03:42:41,836 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [618974974] [2020-08-19 03:42:41,836 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-19 03:42:41,837 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:41,837 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-19 03:42:41,837 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2020-08-19 03:42:41,837 INFO L87 Difference]: Start difference. First operand 28 states and 34 transitions. Second operand 10 states. [2020-08-19 03:42:41,940 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:41,940 INFO L93 Difference]: Finished difference Result 36 states and 43 transitions. [2020-08-19 03:42:41,940 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-19 03:42:41,941 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-08-19 03:42:41,941 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:41,941 INFO L225 Difference]: With dead ends: 36 [2020-08-19 03:42:41,942 INFO L226 Difference]: Without dead ends: 31 [2020-08-19 03:42:41,942 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 [2020-08-19 03:42:41,943 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-19 03:42:41,948 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2020-08-19 03:42:41,948 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-19 03:42:41,949 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 38 transitions. [2020-08-19 03:42:41,949 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 38 transitions. Word has length 27 [2020-08-19 03:42:41,949 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:41,950 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 38 transitions. [2020-08-19 03:42:41,950 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-19 03:42:41,950 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 38 transitions. [2020-08-19 03:42:41,951 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-19 03:42:41,951 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:41,952 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:41,953 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-19 03:42:41,953 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:41,953 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:41,954 INFO L82 PathProgramCache]: Analyzing trace with hash 717166674, now seen corresponding path program 6 times [2020-08-19 03:42:41,954 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:41,954 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1755835366] [2020-08-19 03:42:41,954 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:41,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:42,149 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:42,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:42,153 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 0 proven. 63 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:42,154 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1755835366] [2020-08-19 03:42:42,154 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:42,154 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-19 03:42:42,154 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1731400696] [2020-08-19 03:42:42,155 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-19 03:42:42,155 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:42,155 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-19 03:42:42,156 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2020-08-19 03:42:42,156 INFO L87 Difference]: Start difference. First operand 31 states and 38 transitions. Second operand 11 states. [2020-08-19 03:42:42,267 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:42,268 INFO L93 Difference]: Finished difference Result 39 states and 47 transitions. [2020-08-19 03:42:42,268 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-19 03:42:42,268 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 30 [2020-08-19 03:42:42,269 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:42,269 INFO L225 Difference]: With dead ends: 39 [2020-08-19 03:42:42,270 INFO L226 Difference]: Without dead ends: 34 [2020-08-19 03:42:42,270 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 [2020-08-19 03:42:42,271 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-19 03:42:42,276 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-08-19 03:42:42,276 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-19 03:42:42,277 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 42 transitions. [2020-08-19 03:42:42,277 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 42 transitions. Word has length 30 [2020-08-19 03:42:42,278 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:42,278 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 42 transitions. [2020-08-19 03:42:42,278 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-19 03:42:42,278 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 42 transitions. [2020-08-19 03:42:42,279 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-19 03:42:42,279 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:42,279 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:42,280 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-19 03:42:42,280 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:42,280 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:42,280 INFO L82 PathProgramCache]: Analyzing trace with hash 1472671049, now seen corresponding path program 7 times [2020-08-19 03:42:42,281 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:42,281 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [209426406] [2020-08-19 03:42:42,281 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:42,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:42,428 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:42,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:42,435 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 0 proven. 84 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:42,435 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [209426406] [2020-08-19 03:42:42,435 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:42,436 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-19 03:42:42,436 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [33636648] [2020-08-19 03:42:42,437 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-19 03:42:42,437 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:42,437 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-19 03:42:42,438 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2020-08-19 03:42:42,438 INFO L87 Difference]: Start difference. First operand 34 states and 42 transitions. Second operand 12 states. [2020-08-19 03:42:42,595 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:42,596 INFO L93 Difference]: Finished difference Result 42 states and 51 transitions. [2020-08-19 03:42:42,596 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-19 03:42:42,596 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 33 [2020-08-19 03:42:42,597 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:42,597 INFO L225 Difference]: With dead ends: 42 [2020-08-19 03:42:42,597 INFO L226 Difference]: Without dead ends: 37 [2020-08-19 03:42:42,598 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 [2020-08-19 03:42:42,599 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-19 03:42:42,603 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-08-19 03:42:42,603 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-19 03:42:42,604 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 46 transitions. [2020-08-19 03:42:42,605 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 46 transitions. Word has length 33 [2020-08-19 03:42:42,605 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:42,605 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 46 transitions. [2020-08-19 03:42:42,605 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-19 03:42:42,605 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 46 transitions. [2020-08-19 03:42:42,606 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-19 03:42:42,606 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:42,606 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:42,607 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-19 03:42:42,607 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:42,607 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:42,607 INFO L82 PathProgramCache]: Analyzing trace with hash -1220091662, now seen corresponding path program 8 times [2020-08-19 03:42:42,608 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:42,608 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1657560712] [2020-08-19 03:42:42,608 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:42,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:42,776 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:42,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:42,784 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 0 proven. 108 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:42,785 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1657560712] [2020-08-19 03:42:42,785 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:42,785 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-19 03:42:42,785 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1221685565] [2020-08-19 03:42:42,786 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-19 03:42:42,786 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:42,787 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-19 03:42:42,787 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2020-08-19 03:42:42,787 INFO L87 Difference]: Start difference. First operand 37 states and 46 transitions. Second operand 13 states. [2020-08-19 03:42:42,964 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:42,964 INFO L93 Difference]: Finished difference Result 45 states and 55 transitions. [2020-08-19 03:42:42,965 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-19 03:42:42,965 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 36 [2020-08-19 03:42:42,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:42,968 INFO L225 Difference]: With dead ends: 45 [2020-08-19 03:42:42,968 INFO L226 Difference]: Without dead ends: 40 [2020-08-19 03:42:42,970 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 [2020-08-19 03:42:42,970 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-19 03:42:42,976 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2020-08-19 03:42:42,976 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-19 03:42:42,980 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 50 transitions. [2020-08-19 03:42:42,980 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 50 transitions. Word has length 36 [2020-08-19 03:42:42,980 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:42,981 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 50 transitions. [2020-08-19 03:42:42,983 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-19 03:42:42,983 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 50 transitions. [2020-08-19 03:42:42,984 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-19 03:42:42,984 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:42,984 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:42,984 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-19 03:42:42,984 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:42,985 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:42,985 INFO L82 PathProgramCache]: Analyzing trace with hash 85139625, now seen corresponding path program 9 times [2020-08-19 03:42:42,985 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:42,985 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [84572454] [2020-08-19 03:42:42,985 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:43,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:43,137 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:43,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:43,142 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 0 proven. 135 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:43,142 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [84572454] [2020-08-19 03:42:43,142 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:43,142 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-19 03:42:43,143 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1817647016] [2020-08-19 03:42:43,143 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-19 03:42:43,143 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:43,144 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-19 03:42:43,144 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=157, Unknown=0, NotChecked=0, Total=182 [2020-08-19 03:42:43,144 INFO L87 Difference]: Start difference. First operand 40 states and 50 transitions. Second operand 14 states. [2020-08-19 03:42:43,333 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:43,333 INFO L93 Difference]: Finished difference Result 48 states and 59 transitions. [2020-08-19 03:42:43,333 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-19 03:42:43,334 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 39 [2020-08-19 03:42:43,334 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:43,335 INFO L225 Difference]: With dead ends: 48 [2020-08-19 03:42:43,335 INFO L226 Difference]: Without dead ends: 43 [2020-08-19 03:42:43,335 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 [2020-08-19 03:42:43,336 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-19 03:42:43,340 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-08-19 03:42:43,341 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-19 03:42:43,342 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 54 transitions. [2020-08-19 03:42:43,342 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 54 transitions. Word has length 39 [2020-08-19 03:42:43,342 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:43,342 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 54 transitions. [2020-08-19 03:42:43,342 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-19 03:42:43,343 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 54 transitions. [2020-08-19 03:42:43,343 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-19 03:42:43,343 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:43,344 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:43,344 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-19 03:42:43,344 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:43,344 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:43,344 INFO L82 PathProgramCache]: Analyzing trace with hash 1891479954, now seen corresponding path program 10 times [2020-08-19 03:42:43,345 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:43,345 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [798315416] [2020-08-19 03:42:43,345 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:43,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:43,529 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:43,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:43,534 INFO L134 CoverageAnalysis]: Checked inductivity of 165 backedges. 0 proven. 165 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:43,534 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [798315416] [2020-08-19 03:42:43,534 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:43,535 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-19 03:42:43,535 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1674204893] [2020-08-19 03:42:43,535 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-19 03:42:43,536 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:43,536 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-19 03:42:43,536 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2020-08-19 03:42:43,536 INFO L87 Difference]: Start difference. First operand 43 states and 54 transitions. Second operand 15 states. [2020-08-19 03:42:43,778 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:43,778 INFO L93 Difference]: Finished difference Result 51 states and 63 transitions. [2020-08-19 03:42:43,779 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-19 03:42:43,779 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 42 [2020-08-19 03:42:43,780 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:43,780 INFO L225 Difference]: With dead ends: 51 [2020-08-19 03:42:43,780 INFO L226 Difference]: Without dead ends: 46 [2020-08-19 03:42:43,781 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 [2020-08-19 03:42:43,781 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-19 03:42:43,794 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2020-08-19 03:42:43,794 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-19 03:42:43,795 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 58 transitions. [2020-08-19 03:42:43,795 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 58 transitions. Word has length 42 [2020-08-19 03:42:43,795 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:43,796 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 58 transitions. [2020-08-19 03:42:43,797 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-19 03:42:43,797 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 58 transitions. [2020-08-19 03:42:43,798 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-08-19 03:42:43,801 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:43,802 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:43,802 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-19 03:42:43,802 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:43,802 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:43,803 INFO L82 PathProgramCache]: Analyzing trace with hash -1363997687, now seen corresponding path program 11 times [2020-08-19 03:42:43,803 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:43,803 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1100668656] [2020-08-19 03:42:43,803 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:43,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:43,996 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:43,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:44,001 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 0 proven. 198 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:44,002 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1100668656] [2020-08-19 03:42:44,002 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:44,002 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-19 03:42:44,002 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1398373995] [2020-08-19 03:42:44,004 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-19 03:42:44,004 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:44,005 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-19 03:42:44,005 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=211, Unknown=0, NotChecked=0, Total=240 [2020-08-19 03:42:44,006 INFO L87 Difference]: Start difference. First operand 46 states and 58 transitions. Second operand 16 states. [2020-08-19 03:42:44,355 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:44,355 INFO L93 Difference]: Finished difference Result 54 states and 67 transitions. [2020-08-19 03:42:44,355 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-19 03:42:44,356 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 45 [2020-08-19 03:42:44,356 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:44,357 INFO L225 Difference]: With dead ends: 54 [2020-08-19 03:42:44,357 INFO L226 Difference]: Without dead ends: 49 [2020-08-19 03:42:44,357 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 [2020-08-19 03:42:44,358 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-19 03:42:44,363 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-19 03:42:44,364 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-19 03:42:44,364 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 62 transitions. [2020-08-19 03:42:44,365 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 62 transitions. Word has length 45 [2020-08-19 03:42:44,365 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:44,365 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 62 transitions. [2020-08-19 03:42:44,365 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-19 03:42:44,365 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 62 transitions. [2020-08-19 03:42:44,366 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-19 03:42:44,366 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:44,366 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:44,367 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-19 03:42:44,367 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:44,367 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:44,367 INFO L82 PathProgramCache]: Analyzing trace with hash -641889742, now seen corresponding path program 12 times [2020-08-19 03:42:44,367 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:44,368 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [790283261] [2020-08-19 03:42:44,368 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:44,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:44,619 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:44,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:44,625 INFO L134 CoverageAnalysis]: Checked inductivity of 234 backedges. 0 proven. 234 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:44,626 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [790283261] [2020-08-19 03:42:44,626 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:44,626 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-19 03:42:44,626 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1495081141] [2020-08-19 03:42:44,627 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-19 03:42:44,627 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:44,628 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-19 03:42:44,628 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2020-08-19 03:42:44,628 INFO L87 Difference]: Start difference. First operand 49 states and 62 transitions. Second operand 17 states. [2020-08-19 03:42:44,908 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:44,909 INFO L93 Difference]: Finished difference Result 57 states and 71 transitions. [2020-08-19 03:42:44,909 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-19 03:42:44,909 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 48 [2020-08-19 03:42:44,910 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:44,910 INFO L225 Difference]: With dead ends: 57 [2020-08-19 03:42:44,910 INFO L226 Difference]: Without dead ends: 52 [2020-08-19 03:42:44,911 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 [2020-08-19 03:42:44,911 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-19 03:42:44,916 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2020-08-19 03:42:44,916 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-08-19 03:42:44,917 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 66 transitions. [2020-08-19 03:42:44,917 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 66 transitions. Word has length 48 [2020-08-19 03:42:44,918 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:44,918 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 66 transitions. [2020-08-19 03:42:44,918 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-19 03:42:44,918 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 66 transitions. [2020-08-19 03:42:44,919 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-08-19 03:42:44,919 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:44,919 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:44,919 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-19 03:42:44,919 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:44,920 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:44,920 INFO L82 PathProgramCache]: Analyzing trace with hash -1815285911, now seen corresponding path program 13 times [2020-08-19 03:42:44,920 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:44,920 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1016717988] [2020-08-19 03:42:44,920 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:44,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:45,132 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:45,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:45,143 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 0 proven. 273 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:45,144 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1016717988] [2020-08-19 03:42:45,144 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:45,144 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-19 03:42:45,145 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [786752723] [2020-08-19 03:42:45,146 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-19 03:42:45,146 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:45,147 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-19 03:42:45,147 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=273, Unknown=0, NotChecked=0, Total=306 [2020-08-19 03:42:45,147 INFO L87 Difference]: Start difference. First operand 52 states and 66 transitions. Second operand 18 states. [2020-08-19 03:42:45,491 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:45,491 INFO L93 Difference]: Finished difference Result 60 states and 75 transitions. [2020-08-19 03:42:45,491 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-19 03:42:45,492 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 51 [2020-08-19 03:42:45,492 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:45,492 INFO L225 Difference]: With dead ends: 60 [2020-08-19 03:42:45,493 INFO L226 Difference]: Without dead ends: 55 [2020-08-19 03:42:45,493 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=37, Invalid=305, Unknown=0, NotChecked=0, Total=342 [2020-08-19 03:42:45,494 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-08-19 03:42:45,499 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2020-08-19 03:42:45,499 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-19 03:42:45,500 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 70 transitions. [2020-08-19 03:42:45,500 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 70 transitions. Word has length 51 [2020-08-19 03:42:45,500 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:45,500 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 70 transitions. [2020-08-19 03:42:45,501 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-19 03:42:45,501 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 70 transitions. [2020-08-19 03:42:45,501 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-19 03:42:45,501 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:45,502 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:45,502 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-19 03:42:45,502 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:45,502 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:45,503 INFO L82 PathProgramCache]: Analyzing trace with hash -1721734446, now seen corresponding path program 14 times [2020-08-19 03:42:45,503 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:45,503 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1246546913] [2020-08-19 03:42:45,503 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:45,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:45,759 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:45,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:45,768 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 0 proven. 315 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:45,769 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1246546913] [2020-08-19 03:42:45,772 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:45,772 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-19 03:42:45,772 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [710704915] [2020-08-19 03:42:45,773 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-19 03:42:45,773 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:45,773 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-19 03:42:45,773 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=307, Unknown=0, NotChecked=0, Total=342 [2020-08-19 03:42:45,774 INFO L87 Difference]: Start difference. First operand 55 states and 70 transitions. Second operand 19 states. [2020-08-19 03:42:46,149 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:46,149 INFO L93 Difference]: Finished difference Result 63 states and 79 transitions. [2020-08-19 03:42:46,150 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-19 03:42:46,150 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 54 [2020-08-19 03:42:46,150 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:46,151 INFO L225 Difference]: With dead ends: 63 [2020-08-19 03:42:46,151 INFO L226 Difference]: Without dead ends: 58 [2020-08-19 03:42:46,152 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 [2020-08-19 03:42:46,152 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-19 03:42:46,167 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2020-08-19 03:42:46,167 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-08-19 03:42:46,170 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 74 transitions. [2020-08-19 03:42:46,170 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 74 transitions. Word has length 54 [2020-08-19 03:42:46,171 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:46,172 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 74 transitions. [2020-08-19 03:42:46,172 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-19 03:42:46,172 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 74 transitions. [2020-08-19 03:42:46,174 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-08-19 03:42:46,175 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:46,175 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:46,175 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-19 03:42:46,175 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:46,176 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:46,178 INFO L82 PathProgramCache]: Analyzing trace with hash 2131151561, now seen corresponding path program 15 times [2020-08-19 03:42:46,178 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:46,178 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1134773548] [2020-08-19 03:42:46,179 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:46,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:46,473 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:46,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:46,482 INFO L134 CoverageAnalysis]: Checked inductivity of 360 backedges. 0 proven. 360 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:46,482 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1134773548] [2020-08-19 03:42:46,483 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:46,483 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-19 03:42:46,483 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1617269110] [2020-08-19 03:42:46,484 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-19 03:42:46,484 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:46,485 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-19 03:42:46,486 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=343, Unknown=0, NotChecked=0, Total=380 [2020-08-19 03:42:46,486 INFO L87 Difference]: Start difference. First operand 58 states and 74 transitions. Second operand 20 states. [2020-08-19 03:42:46,889 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:46,889 INFO L93 Difference]: Finished difference Result 66 states and 83 transitions. [2020-08-19 03:42:46,889 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-19 03:42:46,889 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 57 [2020-08-19 03:42:46,890 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:46,890 INFO L225 Difference]: With dead ends: 66 [2020-08-19 03:42:46,890 INFO L226 Difference]: Without dead ends: 61 [2020-08-19 03:42:46,892 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 [2020-08-19 03:42:46,892 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-08-19 03:42:46,897 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2020-08-19 03:42:46,898 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-08-19 03:42:46,898 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 78 transitions. [2020-08-19 03:42:46,898 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 78 transitions. Word has length 57 [2020-08-19 03:42:46,899 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:46,899 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 78 transitions. [2020-08-19 03:42:46,899 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-19 03:42:46,899 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 78 transitions. [2020-08-19 03:42:46,900 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2020-08-19 03:42:46,900 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:46,900 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:46,900 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-19 03:42:46,901 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:46,901 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:46,901 INFO L82 PathProgramCache]: Analyzing trace with hash 457200498, now seen corresponding path program 16 times [2020-08-19 03:42:46,901 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:46,901 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1196513092] [2020-08-19 03:42:46,902 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:46,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:47,202 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:47,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:47,209 INFO L134 CoverageAnalysis]: Checked inductivity of 408 backedges. 0 proven. 408 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:47,210 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1196513092] [2020-08-19 03:42:47,210 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:47,210 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-19 03:42:47,210 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [314448595] [2020-08-19 03:42:47,211 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-19 03:42:47,211 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:47,211 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-19 03:42:47,212 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=381, Unknown=0, NotChecked=0, Total=420 [2020-08-19 03:42:47,212 INFO L87 Difference]: Start difference. First operand 61 states and 78 transitions. Second operand 21 states. [2020-08-19 03:42:47,669 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:47,670 INFO L93 Difference]: Finished difference Result 69 states and 87 transitions. [2020-08-19 03:42:47,670 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-19 03:42:47,670 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 60 [2020-08-19 03:42:47,671 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:47,671 INFO L225 Difference]: With dead ends: 69 [2020-08-19 03:42:47,671 INFO L226 Difference]: Without dead ends: 64 [2020-08-19 03:42:47,672 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 [2020-08-19 03:42:47,672 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-08-19 03:42:47,677 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2020-08-19 03:42:47,678 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-08-19 03:42:47,678 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 82 transitions. [2020-08-19 03:42:47,678 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 82 transitions. Word has length 60 [2020-08-19 03:42:47,679 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:47,679 INFO L479 AbstractCegarLoop]: Abstraction has 64 states and 82 transitions. [2020-08-19 03:42:47,679 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-19 03:42:47,679 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 82 transitions. [2020-08-19 03:42:47,680 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2020-08-19 03:42:47,680 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:47,680 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:47,680 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-19 03:42:47,680 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:47,680 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:47,681 INFO L82 PathProgramCache]: Analyzing trace with hash 646356521, now seen corresponding path program 17 times [2020-08-19 03:42:47,681 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:47,681 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1774379218] [2020-08-19 03:42:47,681 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:47,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:48,028 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:48,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:48,037 INFO L134 CoverageAnalysis]: Checked inductivity of 459 backedges. 0 proven. 459 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:48,037 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1774379218] [2020-08-19 03:42:48,037 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:48,038 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-19 03:42:48,038 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1752940316] [2020-08-19 03:42:48,038 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-19 03:42:48,038 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:48,039 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-19 03:42:48,039 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=421, Unknown=0, NotChecked=0, Total=462 [2020-08-19 03:42:48,039 INFO L87 Difference]: Start difference. First operand 64 states and 82 transitions. Second operand 22 states. [2020-08-19 03:42:48,534 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:48,535 INFO L93 Difference]: Finished difference Result 72 states and 91 transitions. [2020-08-19 03:42:48,539 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-19 03:42:48,539 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 63 [2020-08-19 03:42:48,540 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:48,540 INFO L225 Difference]: With dead ends: 72 [2020-08-19 03:42:48,540 INFO L226 Difference]: Without dead ends: 67 [2020-08-19 03:42:48,541 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 [2020-08-19 03:42:48,541 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2020-08-19 03:42:48,546 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2020-08-19 03:42:48,546 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-08-19 03:42:48,547 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 86 transitions. [2020-08-19 03:42:48,547 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 86 transitions. Word has length 63 [2020-08-19 03:42:48,547 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:48,547 INFO L479 AbstractCegarLoop]: Abstraction has 67 states and 86 transitions. [2020-08-19 03:42:48,547 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-19 03:42:48,548 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 86 transitions. [2020-08-19 03:42:48,548 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2020-08-19 03:42:48,548 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:48,548 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:48,549 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-19 03:42:48,549 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:48,549 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:48,549 INFO L82 PathProgramCache]: Analyzing trace with hash 796345362, now seen corresponding path program 18 times [2020-08-19 03:42:48,549 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:48,550 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [548956831] [2020-08-19 03:42:48,550 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:48,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:48,891 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:48,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:48,901 INFO L134 CoverageAnalysis]: Checked inductivity of 513 backedges. 0 proven. 513 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:48,902 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [548956831] [2020-08-19 03:42:48,902 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:48,902 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-19 03:42:48,902 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [525620088] [2020-08-19 03:42:48,903 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-19 03:42:48,903 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:48,903 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-19 03:42:48,904 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=463, Unknown=0, NotChecked=0, Total=506 [2020-08-19 03:42:48,904 INFO L87 Difference]: Start difference. First operand 67 states and 86 transitions. Second operand 23 states. [2020-08-19 03:42:49,427 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:49,427 INFO L93 Difference]: Finished difference Result 75 states and 95 transitions. [2020-08-19 03:42:49,428 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-19 03:42:49,428 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 66 [2020-08-19 03:42:49,428 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:49,429 INFO L225 Difference]: With dead ends: 75 [2020-08-19 03:42:49,429 INFO L226 Difference]: Without dead ends: 70 [2020-08-19 03:42:49,430 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 [2020-08-19 03:42:49,430 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-08-19 03:42:49,435 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2020-08-19 03:42:49,436 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-08-19 03:42:49,436 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 90 transitions. [2020-08-19 03:42:49,436 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 90 transitions. Word has length 66 [2020-08-19 03:42:49,437 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:49,437 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 90 transitions. [2020-08-19 03:42:49,437 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-19 03:42:49,437 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 90 transitions. [2020-08-19 03:42:49,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-08-19 03:42:49,438 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:49,438 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:49,438 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-19 03:42:49,438 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:49,438 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:49,439 INFO L82 PathProgramCache]: Analyzing trace with hash -1947047543, now seen corresponding path program 19 times [2020-08-19 03:42:49,439 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:49,439 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1319024545] [2020-08-19 03:42:49,439 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:49,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:49,852 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:49,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:49,863 INFO L134 CoverageAnalysis]: Checked inductivity of 570 backedges. 0 proven. 570 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:49,864 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1319024545] [2020-08-19 03:42:49,864 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:49,864 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-19 03:42:49,865 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [636517030] [2020-08-19 03:42:49,866 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-19 03:42:49,866 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:49,866 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-19 03:42:49,867 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=507, Unknown=0, NotChecked=0, Total=552 [2020-08-19 03:42:49,867 INFO L87 Difference]: Start difference. First operand 70 states and 90 transitions. Second operand 24 states. [2020-08-19 03:42:50,435 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:50,435 INFO L93 Difference]: Finished difference Result 78 states and 99 transitions. [2020-08-19 03:42:50,435 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-19 03:42:50,436 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 69 [2020-08-19 03:42:50,436 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:50,437 INFO L225 Difference]: With dead ends: 78 [2020-08-19 03:42:50,437 INFO L226 Difference]: Without dead ends: 73 [2020-08-19 03:42:50,437 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 [2020-08-19 03:42:50,438 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-08-19 03:42:50,444 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 73. [2020-08-19 03:42:50,445 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-08-19 03:42:50,445 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 94 transitions. [2020-08-19 03:42:50,446 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 94 transitions. Word has length 69 [2020-08-19 03:42:50,446 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:50,446 INFO L479 AbstractCegarLoop]: Abstraction has 73 states and 94 transitions. [2020-08-19 03:42:50,446 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-19 03:42:50,447 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 94 transitions. [2020-08-19 03:42:50,448 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2020-08-19 03:42:50,448 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:50,448 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:50,448 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-19 03:42:50,449 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:50,449 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:50,449 INFO L82 PathProgramCache]: Analyzing trace with hash -1432404814, now seen corresponding path program 20 times [2020-08-19 03:42:50,449 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:50,450 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1846768335] [2020-08-19 03:42:50,450 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:50,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:50,880 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:50,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:50,892 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:50,892 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1846768335] [2020-08-19 03:42:50,893 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:50,893 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-19 03:42:50,893 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1859204531] [2020-08-19 03:42:50,893 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-19 03:42:50,894 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:50,894 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-19 03:42:50,894 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=553, Unknown=0, NotChecked=0, Total=600 [2020-08-19 03:42:50,894 INFO L87 Difference]: Start difference. First operand 73 states and 94 transitions. Second operand 25 states. [2020-08-19 03:42:51,510 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:51,510 INFO L93 Difference]: Finished difference Result 81 states and 103 transitions. [2020-08-19 03:42:51,512 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-19 03:42:51,512 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 72 [2020-08-19 03:42:51,513 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:51,513 INFO L225 Difference]: With dead ends: 81 [2020-08-19 03:42:51,513 INFO L226 Difference]: Without dead ends: 76 [2020-08-19 03:42:51,514 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 [2020-08-19 03:42:51,514 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-08-19 03:42:51,521 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 76. [2020-08-19 03:42:51,521 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-08-19 03:42:51,522 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 98 transitions. [2020-08-19 03:42:51,522 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 98 transitions. Word has length 72 [2020-08-19 03:42:51,522 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:51,522 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 98 transitions. [2020-08-19 03:42:51,522 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-19 03:42:51,522 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 98 transitions. [2020-08-19 03:42:51,523 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2020-08-19 03:42:51,523 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:51,523 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:51,523 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-19 03:42:51,523 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:51,524 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:51,524 INFO L82 PathProgramCache]: Analyzing trace with hash 1550855401, now seen corresponding path program 21 times [2020-08-19 03:42:51,524 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:51,524 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [92885616] [2020-08-19 03:42:51,524 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:51,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:51,945 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:51,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:51,953 INFO L134 CoverageAnalysis]: Checked inductivity of 693 backedges. 0 proven. 693 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:51,954 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [92885616] [2020-08-19 03:42:51,954 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:51,954 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-19 03:42:51,955 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [507553522] [2020-08-19 03:42:51,955 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-19 03:42:51,955 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:51,955 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-19 03:42:51,956 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=601, Unknown=0, NotChecked=0, Total=650 [2020-08-19 03:42:51,956 INFO L87 Difference]: Start difference. First operand 76 states and 98 transitions. Second operand 26 states. [2020-08-19 03:42:52,673 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:52,673 INFO L93 Difference]: Finished difference Result 84 states and 107 transitions. [2020-08-19 03:42:52,673 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-19 03:42:52,674 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 75 [2020-08-19 03:42:52,674 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:52,675 INFO L225 Difference]: With dead ends: 84 [2020-08-19 03:42:52,675 INFO L226 Difference]: Without dead ends: 79 [2020-08-19 03:42:52,675 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=53, Invalid=649, Unknown=0, NotChecked=0, Total=702 [2020-08-19 03:42:52,676 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2020-08-19 03:42:52,683 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2020-08-19 03:42:52,683 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-08-19 03:42:52,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 102 transitions. [2020-08-19 03:42:52,684 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 102 transitions. Word has length 75 [2020-08-19 03:42:52,684 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:52,685 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 102 transitions. [2020-08-19 03:42:52,685 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-19 03:42:52,685 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 102 transitions. [2020-08-19 03:42:52,686 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-08-19 03:42:52,686 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:52,686 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:52,687 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-19 03:42:52,687 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:52,687 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:52,687 INFO L82 PathProgramCache]: Analyzing trace with hash 97664338, now seen corresponding path program 22 times [2020-08-19 03:42:52,687 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:52,688 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1255748360] [2020-08-19 03:42:52,688 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:52,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:53,175 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:53,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:53,186 INFO L134 CoverageAnalysis]: Checked inductivity of 759 backedges. 0 proven. 759 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:53,186 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1255748360] [2020-08-19 03:42:53,186 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:53,186 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-19 03:42:53,187 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1154045290] [2020-08-19 03:42:53,187 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-19 03:42:53,187 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:53,187 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-19 03:42:53,188 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=651, Unknown=0, NotChecked=0, Total=702 [2020-08-19 03:42:53,188 INFO L87 Difference]: Start difference. First operand 79 states and 102 transitions. Second operand 27 states. [2020-08-19 03:42:53,953 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:53,954 INFO L93 Difference]: Finished difference Result 87 states and 111 transitions. [2020-08-19 03:42:53,954 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-19 03:42:53,954 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 78 [2020-08-19 03:42:53,955 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:53,956 INFO L225 Difference]: With dead ends: 87 [2020-08-19 03:42:53,956 INFO L226 Difference]: Without dead ends: 82 [2020-08-19 03:42:53,957 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=55, Invalid=701, Unknown=0, NotChecked=0, Total=756 [2020-08-19 03:42:53,958 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-08-19 03:42:53,963 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 82. [2020-08-19 03:42:53,963 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2020-08-19 03:42:53,964 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 106 transitions. [2020-08-19 03:42:53,964 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 106 transitions. Word has length 78 [2020-08-19 03:42:53,964 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:53,964 INFO L479 AbstractCegarLoop]: Abstraction has 82 states and 106 transitions. [2020-08-19 03:42:53,965 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-19 03:42:53,965 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 106 transitions. [2020-08-19 03:42:53,965 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2020-08-19 03:42:53,965 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:53,966 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:53,966 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-19 03:42:53,966 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:53,966 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:53,966 INFO L82 PathProgramCache]: Analyzing trace with hash 1353050185, now seen corresponding path program 23 times [2020-08-19 03:42:53,967 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:53,967 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1542366498] [2020-08-19 03:42:53,967 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:53,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:54,597 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:54,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:54,624 INFO L134 CoverageAnalysis]: Checked inductivity of 828 backedges. 0 proven. 828 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:54,625 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1542366498] [2020-08-19 03:42:54,625 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:54,625 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-19 03:42:54,626 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1400322905] [2020-08-19 03:42:54,626 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-19 03:42:54,626 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:54,627 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-19 03:42:54,627 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=703, Unknown=0, NotChecked=0, Total=756 [2020-08-19 03:42:54,627 INFO L87 Difference]: Start difference. First operand 82 states and 106 transitions. Second operand 28 states. [2020-08-19 03:42:55,646 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:55,647 INFO L93 Difference]: Finished difference Result 90 states and 115 transitions. [2020-08-19 03:42:55,647 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-19 03:42:55,647 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 81 [2020-08-19 03:42:55,648 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:55,649 INFO L225 Difference]: With dead ends: 90 [2020-08-19 03:42:55,649 INFO L226 Difference]: Without dead ends: 85 [2020-08-19 03:42:55,650 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=57, Invalid=755, Unknown=0, NotChecked=0, Total=812 [2020-08-19 03:42:55,650 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2020-08-19 03:42:55,658 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 85. [2020-08-19 03:42:55,658 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2020-08-19 03:42:55,659 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 110 transitions. [2020-08-19 03:42:55,659 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 110 transitions. Word has length 81 [2020-08-19 03:42:55,660 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:55,660 INFO L479 AbstractCegarLoop]: Abstraction has 85 states and 110 transitions. [2020-08-19 03:42:55,660 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-19 03:42:55,660 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 110 transitions. [2020-08-19 03:42:55,665 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2020-08-19 03:42:55,666 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:55,666 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:55,666 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-19 03:42:55,666 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:55,666 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:55,666 INFO L82 PathProgramCache]: Analyzing trace with hash -22395406, now seen corresponding path program 24 times [2020-08-19 03:42:55,667 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:55,667 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [114744521] [2020-08-19 03:42:55,667 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:55,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:56,213 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:56,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:56,228 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:56,229 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [114744521] [2020-08-19 03:42:56,229 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:56,229 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-19 03:42:56,229 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [343885344] [2020-08-19 03:42:56,230 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-19 03:42:56,230 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:56,230 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-19 03:42:56,230 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=757, Unknown=0, NotChecked=0, Total=812 [2020-08-19 03:42:56,231 INFO L87 Difference]: Start difference. First operand 85 states and 110 transitions. Second operand 29 states. [2020-08-19 03:42:57,131 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:57,132 INFO L93 Difference]: Finished difference Result 93 states and 119 transitions. [2020-08-19 03:42:57,132 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-19 03:42:57,132 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 84 [2020-08-19 03:42:57,133 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:57,133 INFO L225 Difference]: With dead ends: 93 [2020-08-19 03:42:57,133 INFO L226 Difference]: Without dead ends: 88 [2020-08-19 03:42:57,134 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=59, Invalid=811, Unknown=0, NotChecked=0, Total=870 [2020-08-19 03:42:57,134 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-08-19 03:42:57,139 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 88. [2020-08-19 03:42:57,139 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2020-08-19 03:42:57,140 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 114 transitions. [2020-08-19 03:42:57,140 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 114 transitions. Word has length 84 [2020-08-19 03:42:57,140 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:57,141 INFO L479 AbstractCegarLoop]: Abstraction has 88 states and 114 transitions. [2020-08-19 03:42:57,141 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-19 03:42:57,141 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 114 transitions. [2020-08-19 03:42:57,141 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2020-08-19 03:42:57,142 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:57,142 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:57,142 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-19 03:42:57,142 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:57,142 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:57,142 INFO L82 PathProgramCache]: Analyzing trace with hash -1933993047, now seen corresponding path program 25 times [2020-08-19 03:42:57,143 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:57,143 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1029957387] [2020-08-19 03:42:57,143 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:57,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:57,832 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:57,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:57,859 INFO L134 CoverageAnalysis]: Checked inductivity of 975 backedges. 0 proven. 975 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:57,859 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1029957387] [2020-08-19 03:42:57,860 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:57,860 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-19 03:42:57,861 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [232082413] [2020-08-19 03:42:57,861 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-19 03:42:57,862 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:57,862 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-19 03:42:57,863 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=813, Unknown=0, NotChecked=0, Total=870 [2020-08-19 03:42:57,863 INFO L87 Difference]: Start difference. First operand 88 states and 114 transitions. Second operand 30 states. [2020-08-19 03:42:59,080 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:59,081 INFO L93 Difference]: Finished difference Result 96 states and 123 transitions. [2020-08-19 03:42:59,081 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-19 03:42:59,081 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 87 [2020-08-19 03:42:59,081 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:59,082 INFO L225 Difference]: With dead ends: 96 [2020-08-19 03:42:59,082 INFO L226 Difference]: Without dead ends: 91 [2020-08-19 03:42:59,084 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=61, Invalid=869, Unknown=0, NotChecked=0, Total=930 [2020-08-19 03:42:59,084 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2020-08-19 03:42:59,090 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 91. [2020-08-19 03:42:59,090 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2020-08-19 03:42:59,091 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 118 transitions. [2020-08-19 03:42:59,091 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 118 transitions. Word has length 87 [2020-08-19 03:42:59,091 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:59,091 INFO L479 AbstractCegarLoop]: Abstraction has 91 states and 118 transitions. [2020-08-19 03:42:59,091 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-19 03:42:59,092 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 118 transitions. [2020-08-19 03:42:59,092 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2020-08-19 03:42:59,092 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:59,093 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:59,093 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-19 03:42:59,093 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:59,093 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:59,093 INFO L82 PathProgramCache]: Analyzing trace with hash 927028882, now seen corresponding path program 26 times [2020-08-19 03:42:59,094 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:59,094 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1028455097] [2020-08-19 03:42:59,094 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:59,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:59,803 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:59,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:59,837 INFO L134 CoverageAnalysis]: Checked inductivity of 1053 backedges. 0 proven. 1053 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:59,837 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1028455097] [2020-08-19 03:42:59,838 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:59,838 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-19 03:42:59,838 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [753913323] [2020-08-19 03:42:59,838 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-19 03:42:59,839 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:59,839 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-19 03:42:59,840 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=871, Unknown=0, NotChecked=0, Total=930 [2020-08-19 03:42:59,840 INFO L87 Difference]: Start difference. First operand 91 states and 118 transitions. Second operand 31 states. [2020-08-19 03:43:00,830 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:43:00,830 INFO L93 Difference]: Finished difference Result 99 states and 127 transitions. [2020-08-19 03:43:00,830 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-19 03:43:00,830 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 90 [2020-08-19 03:43:00,831 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:43:00,832 INFO L225 Difference]: With dead ends: 99 [2020-08-19 03:43:00,832 INFO L226 Difference]: Without dead ends: 94 [2020-08-19 03:43:00,833 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=63, Invalid=929, Unknown=0, NotChecked=0, Total=992 [2020-08-19 03:43:00,833 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2020-08-19 03:43:00,838 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 94. [2020-08-19 03:43:00,839 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 94 states. [2020-08-19 03:43:00,839 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 122 transitions. [2020-08-19 03:43:00,839 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 122 transitions. Word has length 90 [2020-08-19 03:43:00,840 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:43:00,840 INFO L479 AbstractCegarLoop]: Abstraction has 94 states and 122 transitions. [2020-08-19 03:43:00,840 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-19 03:43:00,840 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 122 transitions. [2020-08-19 03:43:00,841 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2020-08-19 03:43:00,841 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:43:00,841 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:43:00,841 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-19 03:43:00,841 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:43:00,841 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:43:00,842 INFO L82 PathProgramCache]: Analyzing trace with hash 5326601, now seen corresponding path program 27 times [2020-08-19 03:43:00,842 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:43:00,842 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [62069105] [2020-08-19 03:43:00,842 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:43:00,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:43:01,539 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:43:01,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:43:01,558 INFO L134 CoverageAnalysis]: Checked inductivity of 1134 backedges. 0 proven. 1134 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:43:01,558 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [62069105] [2020-08-19 03:43:01,558 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:43:01,559 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-19 03:43:01,559 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1472695015] [2020-08-19 03:43:01,559 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-19 03:43:01,559 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:43:01,560 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-19 03:43:01,560 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=931, Unknown=0, NotChecked=0, Total=992 [2020-08-19 03:43:01,560 INFO L87 Difference]: Start difference. First operand 94 states and 122 transitions. Second operand 32 states. [2020-08-19 03:43:02,645 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:43:02,645 INFO L93 Difference]: Finished difference Result 102 states and 131 transitions. [2020-08-19 03:43:02,646 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-19 03:43:02,646 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 93 [2020-08-19 03:43:02,646 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:43:02,647 INFO L225 Difference]: With dead ends: 102 [2020-08-19 03:43:02,647 INFO L226 Difference]: Without dead ends: 97 [2020-08-19 03:43:02,648 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 [2020-08-19 03:43:02,649 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2020-08-19 03:43:02,655 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 97. [2020-08-19 03:43:02,655 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2020-08-19 03:43:02,656 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 126 transitions. [2020-08-19 03:43:02,656 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 126 transitions. Word has length 93 [2020-08-19 03:43:02,656 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:43:02,657 INFO L479 AbstractCegarLoop]: Abstraction has 97 states and 126 transitions. [2020-08-19 03:43:02,657 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-19 03:43:02,657 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 126 transitions. [2020-08-19 03:43:02,658 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-08-19 03:43:02,658 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:43:02,658 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:43:02,658 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-19 03:43:02,658 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:43:02,659 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:43:02,659 INFO L82 PathProgramCache]: Analyzing trace with hash -701403342, now seen corresponding path program 28 times [2020-08-19 03:43:02,659 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:43:02,659 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1984037853] [2020-08-19 03:43:02,659 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:43:02,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:43:03,351 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:43:03,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:43:03,367 INFO L134 CoverageAnalysis]: Checked inductivity of 1218 backedges. 0 proven. 1218 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:43:03,367 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1984037853] [2020-08-19 03:43:03,368 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:43:03,368 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-19 03:43:03,368 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [126250958] [2020-08-19 03:43:03,368 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-19 03:43:03,368 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:43:03,369 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-19 03:43:03,369 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=993, Unknown=0, NotChecked=0, Total=1056 [2020-08-19 03:43:03,369 INFO L87 Difference]: Start difference. First operand 97 states and 126 transitions. Second operand 33 states. [2020-08-19 03:43:04,562 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:43:04,563 INFO L93 Difference]: Finished difference Result 105 states and 135 transitions. [2020-08-19 03:43:04,563 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-19 03:43:04,563 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 96 [2020-08-19 03:43:04,564 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:43:04,565 INFO L225 Difference]: With dead ends: 105 [2020-08-19 03:43:04,565 INFO L226 Difference]: Without dead ends: 100 [2020-08-19 03:43:04,566 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=67, Invalid=1055, Unknown=0, NotChecked=0, Total=1122 [2020-08-19 03:43:04,566 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2020-08-19 03:43:04,573 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 100. [2020-08-19 03:43:04,573 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 100 states. [2020-08-19 03:43:04,574 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 130 transitions. [2020-08-19 03:43:04,574 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 130 transitions. Word has length 96 [2020-08-19 03:43:04,574 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:43:04,574 INFO L479 AbstractCegarLoop]: Abstraction has 100 states and 130 transitions. [2020-08-19 03:43:04,575 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-19 03:43:04,575 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 130 transitions. [2020-08-19 03:43:04,575 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2020-08-19 03:43:04,576 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:43:04,576 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:43:04,576 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-19 03:43:04,576 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:43:04,576 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:43:04,576 INFO L82 PathProgramCache]: Analyzing trace with hash -963450263, now seen corresponding path program 29 times [2020-08-19 03:43:04,577 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:43:04,577 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [902693974] [2020-08-19 03:43:04,577 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:43:04,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:43:05,330 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:43:05,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:43:05,349 INFO L134 CoverageAnalysis]: Checked inductivity of 1305 backedges. 0 proven. 1305 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:43:05,350 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [902693974] [2020-08-19 03:43:05,350 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:43:05,350 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-19 03:43:05,350 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1947757604] [2020-08-19 03:43:05,351 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-19 03:43:05,351 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:43:05,351 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-19 03:43:05,352 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=1057, Unknown=0, NotChecked=0, Total=1122 [2020-08-19 03:43:05,352 INFO L87 Difference]: Start difference. First operand 100 states and 130 transitions. Second operand 34 states. [2020-08-19 03:43:06,597 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:43:06,598 INFO L93 Difference]: Finished difference Result 108 states and 139 transitions. [2020-08-19 03:43:06,598 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-19 03:43:06,598 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 99 [2020-08-19 03:43:06,599 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:43:06,600 INFO L225 Difference]: With dead ends: 108 [2020-08-19 03:43:06,600 INFO L226 Difference]: Without dead ends: 103 [2020-08-19 03:43:06,601 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 [2020-08-19 03:43:06,601 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2020-08-19 03:43:06,609 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103. [2020-08-19 03:43:06,609 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2020-08-19 03:43:06,610 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 134 transitions. [2020-08-19 03:43:06,610 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 134 transitions. Word has length 99 [2020-08-19 03:43:06,610 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:43:06,610 INFO L479 AbstractCegarLoop]: Abstraction has 103 states and 134 transitions. [2020-08-19 03:43:06,611 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-19 03:43:06,611 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 134 transitions. [2020-08-19 03:43:06,611 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2020-08-19 03:43:06,612 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:43:06,612 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:43:06,612 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-19 03:43:06,612 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:43:06,612 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:43:06,613 INFO L82 PathProgramCache]: Analyzing trace with hash 647270354, now seen corresponding path program 30 times [2020-08-19 03:43:06,613 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:43:06,613 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [549131560] [2020-08-19 03:43:06,613 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:43:06,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:43:07,413 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:43:07,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:43:07,437 INFO L134 CoverageAnalysis]: Checked inductivity of 1395 backedges. 0 proven. 1395 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:43:07,437 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [549131560] [2020-08-19 03:43:07,437 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:43:07,437 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-19 03:43:07,437 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1328476753] [2020-08-19 03:43:07,438 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-19 03:43:07,438 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:43:07,438 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-19 03:43:07,439 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=1123, Unknown=0, NotChecked=0, Total=1190 [2020-08-19 03:43:07,439 INFO L87 Difference]: Start difference. First operand 103 states and 134 transitions. Second operand 35 states. [2020-08-19 03:43:08,740 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:43:08,740 INFO L93 Difference]: Finished difference Result 111 states and 143 transitions. [2020-08-19 03:43:08,747 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-19 03:43:08,747 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 102 [2020-08-19 03:43:08,747 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:43:08,748 INFO L225 Difference]: With dead ends: 111 [2020-08-19 03:43:08,748 INFO L226 Difference]: Without dead ends: 106 [2020-08-19 03:43:08,749 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 [2020-08-19 03:43:08,749 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2020-08-19 03:43:08,757 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 106. [2020-08-19 03:43:08,758 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106 states. [2020-08-19 03:43:08,759 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 138 transitions. [2020-08-19 03:43:08,759 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 138 transitions. Word has length 102 [2020-08-19 03:43:08,760 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:43:08,760 INFO L479 AbstractCegarLoop]: Abstraction has 106 states and 138 transitions. [2020-08-19 03:43:08,760 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-19 03:43:08,760 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 138 transitions. [2020-08-19 03:43:08,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2020-08-19 03:43:08,761 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:43:08,761 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:43:08,761 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-19 03:43:08,761 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:43:08,762 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:43:08,762 INFO L82 PathProgramCache]: Analyzing trace with hash -2044426807, now seen corresponding path program 31 times [2020-08-19 03:43:08,762 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:43:08,762 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [198561349] [2020-08-19 03:43:08,762 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:43:08,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:43:09,629 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:43:09,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:43:09,653 INFO L134 CoverageAnalysis]: Checked inductivity of 1488 backedges. 0 proven. 1488 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:43:09,653 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [198561349] [2020-08-19 03:43:09,654 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:43:09,654 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-19 03:43:09,654 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [425625266] [2020-08-19 03:43:09,655 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-19 03:43:09,655 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:43:09,655 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-19 03:43:09,656 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=1191, Unknown=0, NotChecked=0, Total=1260 [2020-08-19 03:43:09,656 INFO L87 Difference]: Start difference. First operand 106 states and 138 transitions. Second operand 36 states. [2020-08-19 03:43:11,041 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:43:11,041 INFO L93 Difference]: Finished difference Result 114 states and 147 transitions. [2020-08-19 03:43:11,041 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-19 03:43:11,042 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 105 [2020-08-19 03:43:11,042 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:43:11,043 INFO L225 Difference]: With dead ends: 114 [2020-08-19 03:43:11,043 INFO L226 Difference]: Without dead ends: 109 [2020-08-19 03:43:11,044 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 [2020-08-19 03:43:11,044 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2020-08-19 03:43:11,051 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 109. [2020-08-19 03:43:11,051 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 109 states. [2020-08-19 03:43:11,052 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 142 transitions. [2020-08-19 03:43:11,052 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 142 transitions. Word has length 105 [2020-08-19 03:43:11,052 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:43:11,053 INFO L479 AbstractCegarLoop]: Abstraction has 109 states and 142 transitions. [2020-08-19 03:43:11,053 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-19 03:43:11,053 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 142 transitions. [2020-08-19 03:43:11,054 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2020-08-19 03:43:11,054 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:43:11,054 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:43:11,054 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-19 03:43:11,054 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:43:11,054 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:43:11,055 INFO L82 PathProgramCache]: Analyzing trace with hash 939833458, now seen corresponding path program 32 times [2020-08-19 03:43:11,055 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:43:11,055 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [70263408] [2020-08-19 03:43:11,055 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:43:11,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:43:11,974 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:43:11,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:43:11,992 INFO L134 CoverageAnalysis]: Checked inductivity of 1584 backedges. 0 proven. 1584 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:43:11,993 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [70263408] [2020-08-19 03:43:11,993 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:43:11,993 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-19 03:43:11,993 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [400278417] [2020-08-19 03:43:11,993 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-19 03:43:11,994 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:43:11,994 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-19 03:43:11,994 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=1261, Unknown=0, NotChecked=0, Total=1332 [2020-08-19 03:43:11,995 INFO L87 Difference]: Start difference. First operand 109 states and 142 transitions. Second operand 37 states. [2020-08-19 03:43:13,489 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:43:13,490 INFO L93 Difference]: Finished difference Result 117 states and 151 transitions. [2020-08-19 03:43:13,490 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-19 03:43:13,491 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 108 [2020-08-19 03:43:13,491 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:43:13,492 INFO L225 Difference]: With dead ends: 117 [2020-08-19 03:43:13,492 INFO L226 Difference]: Without dead ends: 112 [2020-08-19 03:43:13,493 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 [2020-08-19 03:43:13,494 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2020-08-19 03:43:13,501 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 112. [2020-08-19 03:43:13,502 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 112 states. [2020-08-19 03:43:13,502 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 146 transitions. [2020-08-19 03:43:13,502 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 146 transitions. Word has length 108 [2020-08-19 03:43:13,503 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:43:13,503 INFO L479 AbstractCegarLoop]: Abstraction has 112 states and 146 transitions. [2020-08-19 03:43:13,503 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-19 03:43:13,503 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 146 transitions. [2020-08-19 03:43:13,504 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2020-08-19 03:43:13,504 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:43:13,504 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:43:13,504 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-19 03:43:13,505 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:43:13,505 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:43:13,505 INFO L82 PathProgramCache]: Analyzing trace with hash -785639127, now seen corresponding path program 33 times [2020-08-19 03:43:13,505 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:43:13,505 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [384841292] [2020-08-19 03:43:13,505 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:43:13,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:43:14,454 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:43:14,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:43:14,474 INFO L134 CoverageAnalysis]: Checked inductivity of 1683 backedges. 0 proven. 1683 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:43:14,474 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [384841292] [2020-08-19 03:43:14,474 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:43:14,475 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-19 03:43:14,475 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1526658002] [2020-08-19 03:43:14,475 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-19 03:43:14,475 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:43:14,476 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-19 03:43:14,476 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=1333, Unknown=0, NotChecked=0, Total=1406 [2020-08-19 03:43:14,476 INFO L87 Difference]: Start difference. First operand 112 states and 146 transitions. Second operand 38 states. [2020-08-19 03:43:16,065 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:43:16,065 INFO L93 Difference]: Finished difference Result 120 states and 155 transitions. [2020-08-19 03:43:16,066 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-19 03:43:16,066 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 111 [2020-08-19 03:43:16,066 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:43:16,067 INFO L225 Difference]: With dead ends: 120 [2020-08-19 03:43:16,068 INFO L226 Difference]: Without dead ends: 115 [2020-08-19 03:43:16,069 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 [2020-08-19 03:43:16,069 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2020-08-19 03:43:16,077 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 115. [2020-08-19 03:43:16,078 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2020-08-19 03:43:16,078 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 150 transitions. [2020-08-19 03:43:16,078 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 150 transitions. Word has length 111 [2020-08-19 03:43:16,079 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:43:16,079 INFO L479 AbstractCegarLoop]: Abstraction has 115 states and 150 transitions. [2020-08-19 03:43:16,079 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-19 03:43:16,079 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 150 transitions. [2020-08-19 03:43:16,080 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2020-08-19 03:43:16,080 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:43:16,080 INFO L422 BasicCegarLoop]: trace histogram [35, 35, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:43:16,080 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-19 03:43:16,080 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:43:16,080 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:43:16,081 INFO L82 PathProgramCache]: Analyzing trace with hash 2124146962, now seen corresponding path program 34 times [2020-08-19 03:43:16,081 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:43:16,081 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [960237384] [2020-08-19 03:43:16,081 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:43:16,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:43:17,084 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:43:17,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:43:17,118 INFO L134 CoverageAnalysis]: Checked inductivity of 1785 backedges. 0 proven. 1785 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:43:17,118 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [960237384] [2020-08-19 03:43:17,118 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:43:17,118 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-19 03:43:17,119 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [206652681] [2020-08-19 03:43:17,119 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-19 03:43:17,119 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:43:17,119 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-19 03:43:17,120 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=1407, Unknown=0, NotChecked=0, Total=1482 [2020-08-19 03:43:17,120 INFO L87 Difference]: Start difference. First operand 115 states and 150 transitions. Second operand 39 states. [2020-08-19 03:43:18,851 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:43:18,851 INFO L93 Difference]: Finished difference Result 123 states and 159 transitions. [2020-08-19 03:43:18,852 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-19 03:43:18,852 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 114 [2020-08-19 03:43:18,852 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:43:18,853 INFO L225 Difference]: With dead ends: 123 [2020-08-19 03:43:18,854 INFO L226 Difference]: Without dead ends: 118 [2020-08-19 03:43:18,855 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 [2020-08-19 03:43:18,855 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2020-08-19 03:43:18,864 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 118. [2020-08-19 03:43:18,864 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 118 states. [2020-08-19 03:43:18,865 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 154 transitions. [2020-08-19 03:43:18,865 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 154 transitions. Word has length 114 [2020-08-19 03:43:18,866 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:43:18,866 INFO L479 AbstractCegarLoop]: Abstraction has 118 states and 154 transitions. [2020-08-19 03:43:18,866 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-19 03:43:18,866 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 154 transitions. [2020-08-19 03:43:18,867 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-08-19 03:43:18,867 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:43:18,867 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:43:18,868 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-19 03:43:18,868 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:43:18,868 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:43:18,868 INFO L82 PathProgramCache]: Analyzing trace with hash -2058378103, now seen corresponding path program 35 times [2020-08-19 03:43:18,868 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:43:18,868 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [107878434] [2020-08-19 03:43:18,869 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:43:18,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:43:19,904 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:43:19,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:43:19,925 INFO L134 CoverageAnalysis]: Checked inductivity of 1890 backedges. 0 proven. 1890 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:43:19,925 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [107878434] [2020-08-19 03:43:19,925 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:43:19,925 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-19 03:43:19,925 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [971076879] [2020-08-19 03:43:19,926 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-19 03:43:19,926 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:43:19,926 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-19 03:43:19,927 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=1483, Unknown=0, NotChecked=0, Total=1560 [2020-08-19 03:43:19,927 INFO L87 Difference]: Start difference. First operand 118 states and 154 transitions. Second operand 40 states. [2020-08-19 03:43:21,699 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:43:21,699 INFO L93 Difference]: Finished difference Result 126 states and 163 transitions. [2020-08-19 03:43:21,700 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-19 03:43:21,700 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 117 [2020-08-19 03:43:21,700 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:43:21,704 INFO L225 Difference]: With dead ends: 126 [2020-08-19 03:43:21,704 INFO L226 Difference]: Without dead ends: 121 [2020-08-19 03:43:21,705 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=81, Invalid=1559, Unknown=0, NotChecked=0, Total=1640 [2020-08-19 03:43:21,706 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2020-08-19 03:43:21,719 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 121. [2020-08-19 03:43:21,719 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 121 states. [2020-08-19 03:43:21,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 158 transitions. [2020-08-19 03:43:21,720 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 158 transitions. Word has length 117 [2020-08-19 03:43:21,720 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:43:21,720 INFO L479 AbstractCegarLoop]: Abstraction has 121 states and 158 transitions. [2020-08-19 03:43:21,720 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-19 03:43:21,721 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 158 transitions. [2020-08-19 03:43:21,721 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2020-08-19 03:43:21,721 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:43:21,722 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:43:21,722 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-19 03:43:21,722 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:43:21,722 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:43:21,722 INFO L82 PathProgramCache]: Analyzing trace with hash 1928602034, now seen corresponding path program 36 times [2020-08-19 03:43:21,722 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:43:21,722 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [834335469] [2020-08-19 03:43:21,722 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:43:21,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:43:22,813 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:43:22,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:43:22,833 INFO L134 CoverageAnalysis]: Checked inductivity of 1998 backedges. 0 proven. 1998 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:43:22,833 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [834335469] [2020-08-19 03:43:22,833 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:43:22,833 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-19 03:43:22,834 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2063976798] [2020-08-19 03:43:22,834 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-19 03:43:22,834 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:43:22,835 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-19 03:43:22,835 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=1561, Unknown=0, NotChecked=0, Total=1640 [2020-08-19 03:43:22,835 INFO L87 Difference]: Start difference. First operand 121 states and 158 transitions. Second operand 41 states. [2020-08-19 03:43:24,764 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:43:24,765 INFO L93 Difference]: Finished difference Result 129 states and 167 transitions. [2020-08-19 03:43:24,765 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-19 03:43:24,765 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 120 [2020-08-19 03:43:24,766 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:43:24,767 INFO L225 Difference]: With dead ends: 129 [2020-08-19 03:43:24,767 INFO L226 Difference]: Without dead ends: 124 [2020-08-19 03:43:24,770 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=83, Invalid=1639, Unknown=0, NotChecked=0, Total=1722 [2020-08-19 03:43:24,770 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2020-08-19 03:43:24,777 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 124. [2020-08-19 03:43:24,777 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 124 states. [2020-08-19 03:43:24,777 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 162 transitions. [2020-08-19 03:43:24,778 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 162 transitions. Word has length 120 [2020-08-19 03:43:24,778 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:43:24,778 INFO L479 AbstractCegarLoop]: Abstraction has 124 states and 162 transitions. [2020-08-19 03:43:24,778 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-19 03:43:24,778 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 162 transitions. [2020-08-19 03:43:24,778 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2020-08-19 03:43:24,778 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:43:24,779 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:43:24,779 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-19 03:43:24,779 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:43:24,779 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:43:24,779 INFO L82 PathProgramCache]: Analyzing trace with hash 733292521, now seen corresponding path program 37 times [2020-08-19 03:43:24,779 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:43:24,780 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1680246197] [2020-08-19 03:43:24,780 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:43:24,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:43:25,991 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:43:25,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:43:26,012 INFO L134 CoverageAnalysis]: Checked inductivity of 2109 backedges. 0 proven. 2109 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:43:26,013 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1680246197] [2020-08-19 03:43:26,013 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:43:26,013 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-19 03:43:26,013 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [788147475] [2020-08-19 03:43:26,013 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-19 03:43:26,013 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:43:26,014 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-19 03:43:26,014 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=1641, Unknown=0, NotChecked=0, Total=1722 [2020-08-19 03:43:26,014 INFO L87 Difference]: Start difference. First operand 124 states and 162 transitions. Second operand 42 states. [2020-08-19 03:43:28,160 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:43:28,160 INFO L93 Difference]: Finished difference Result 132 states and 171 transitions. [2020-08-19 03:43:28,160 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-19 03:43:28,160 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 123 [2020-08-19 03:43:28,161 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:43:28,162 INFO L225 Difference]: With dead ends: 132 [2020-08-19 03:43:28,162 INFO L226 Difference]: Without dead ends: 127 [2020-08-19 03:43:28,163 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 [2020-08-19 03:43:28,163 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2020-08-19 03:43:28,172 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 127. [2020-08-19 03:43:28,172 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 127 states. [2020-08-19 03:43:28,173 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 166 transitions. [2020-08-19 03:43:28,173 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 166 transitions. Word has length 123 [2020-08-19 03:43:28,173 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:43:28,174 INFO L479 AbstractCegarLoop]: Abstraction has 127 states and 166 transitions. [2020-08-19 03:43:28,174 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-19 03:43:28,174 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 166 transitions. [2020-08-19 03:43:28,174 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2020-08-19 03:43:28,174 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:43:28,175 INFO L422 BasicCegarLoop]: trace histogram [39, 39, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:43:28,175 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-19 03:43:28,175 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:43:28,175 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:43:28,175 INFO L82 PathProgramCache]: Analyzing trace with hash 841441874, now seen corresponding path program 38 times [2020-08-19 03:43:28,176 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:43:28,176 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [605564453] [2020-08-19 03:43:28,176 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:43:28,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:43:29,443 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:43:29,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:43:29,467 INFO L134 CoverageAnalysis]: Checked inductivity of 2223 backedges. 0 proven. 2223 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:43:29,467 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [605564453] [2020-08-19 03:43:29,467 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:43:29,467 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-19 03:43:29,467 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [28314564] [2020-08-19 03:43:29,468 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-19 03:43:29,468 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:43:29,468 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-19 03:43:29,469 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=1723, Unknown=0, NotChecked=0, Total=1806 [2020-08-19 03:43:29,469 INFO L87 Difference]: Start difference. First operand 127 states and 166 transitions. Second operand 43 states. [2020-08-19 03:43:31,688 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:43:31,688 INFO L93 Difference]: Finished difference Result 135 states and 175 transitions. [2020-08-19 03:43:31,689 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-08-19 03:43:31,689 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 126 [2020-08-19 03:43:31,690 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:43:31,691 INFO L225 Difference]: With dead ends: 135 [2020-08-19 03:43:31,691 INFO L226 Difference]: Without dead ends: 130 [2020-08-19 03:43:31,692 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=87, Invalid=1805, Unknown=0, NotChecked=0, Total=1892 [2020-08-19 03:43:31,692 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2020-08-19 03:43:31,702 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 130. [2020-08-19 03:43:31,703 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 130 states. [2020-08-19 03:43:31,703 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 170 transitions. [2020-08-19 03:43:31,704 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 170 transitions. Word has length 126 [2020-08-19 03:43:31,704 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:43:31,704 INFO L479 AbstractCegarLoop]: Abstraction has 130 states and 170 transitions. [2020-08-19 03:43:31,704 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-19 03:43:31,704 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 170 transitions. [2020-08-19 03:43:31,705 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2020-08-19 03:43:31,705 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:43:31,705 INFO L422 BasicCegarLoop]: trace histogram [40, 40, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:43:31,705 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-19 03:43:31,705 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:43:31,706 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:43:31,706 INFO L82 PathProgramCache]: Analyzing trace with hash 1493345097, now seen corresponding path program 39 times [2020-08-19 03:43:31,706 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:43:31,706 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1236616156] [2020-08-19 03:43:31,706 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:43:31,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:43:33,216 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:43:33,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:43:33,241 INFO L134 CoverageAnalysis]: Checked inductivity of 2340 backedges. 0 proven. 2340 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:43:33,241 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1236616156] [2020-08-19 03:43:33,241 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:43:33,241 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44] total 44 [2020-08-19 03:43:33,242 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1991547008] [2020-08-19 03:43:33,242 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-08-19 03:43:33,242 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:43:33,242 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-08-19 03:43:33,243 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=1807, Unknown=0, NotChecked=0, Total=1892 [2020-08-19 03:43:33,243 INFO L87 Difference]: Start difference. First operand 130 states and 170 transitions. Second operand 44 states. [2020-08-19 03:43:35,551 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:43:35,551 INFO L93 Difference]: Finished difference Result 138 states and 179 transitions. [2020-08-19 03:43:35,551 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-08-19 03:43:35,551 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 129 [2020-08-19 03:43:35,552 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:43:35,553 INFO L225 Difference]: With dead ends: 138 [2020-08-19 03:43:35,553 INFO L226 Difference]: Without dead ends: 133 [2020-08-19 03:43:35,554 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=89, Invalid=1891, Unknown=0, NotChecked=0, Total=1980 [2020-08-19 03:43:35,555 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2020-08-19 03:43:35,565 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 133. [2020-08-19 03:43:35,565 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 133 states. [2020-08-19 03:43:35,566 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 174 transitions. [2020-08-19 03:43:35,566 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 174 transitions. Word has length 129 [2020-08-19 03:43:35,566 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:43:35,566 INFO L479 AbstractCegarLoop]: Abstraction has 133 states and 174 transitions. [2020-08-19 03:43:35,566 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-08-19 03:43:35,566 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 174 transitions. [2020-08-19 03:43:35,567 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2020-08-19 03:43:35,567 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:43:35,567 INFO L422 BasicCegarLoop]: trace histogram [41, 41, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:43:35,568 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-19 03:43:35,568 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:43:35,568 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:43:35,568 INFO L82 PathProgramCache]: Analyzing trace with hash 500148978, now seen corresponding path program 40 times [2020-08-19 03:43:35,568 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:43:35,568 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1988721216] [2020-08-19 03:43:35,569 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:43:35,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:43:37,075 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:43:37,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:43:37,106 INFO L134 CoverageAnalysis]: Checked inductivity of 2460 backedges. 0 proven. 2460 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:43:37,106 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1988721216] [2020-08-19 03:43:37,106 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:43:37,106 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45] total 45 [2020-08-19 03:43:37,107 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1200278141] [2020-08-19 03:43:37,107 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2020-08-19 03:43:37,107 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:43:37,107 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2020-08-19 03:43:37,108 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=1893, Unknown=0, NotChecked=0, Total=1980 [2020-08-19 03:43:37,108 INFO L87 Difference]: Start difference. First operand 133 states and 174 transitions. Second operand 45 states.