/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-acceleration/array_1-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-19 03:42:10,766 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-19 03:42:10,769 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-19 03:42:10,805 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-19 03:42:10,805 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-19 03:42:10,814 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-19 03:42:10,816 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-19 03:42:10,820 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-19 03:42:10,822 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-19 03:42:10,825 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-19 03:42:10,826 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-19 03:42:10,827 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-19 03:42:10,827 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-19 03:42:10,830 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-19 03:42:10,832 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-19 03:42:10,834 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-19 03:42:10,836 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-19 03:42:10,838 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-19 03:42:10,839 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-19 03:42:10,847 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-19 03:42:10,849 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-19 03:42:10,850 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-19 03:42:10,851 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-19 03:42:10,851 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-19 03:42:10,857 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-19 03:42:10,857 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-19 03:42:10,858 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-19 03:42:10,859 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-19 03:42:10,859 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-19 03:42:10,863 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... 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[2020-08-19 03:42:10,867 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-19 03:42:10,867 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-19 03:42:10,868 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-19 03:42:10,869 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 03:42:10,890 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-19 03:42:10,890 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-19 03:42:10,891 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-19 03:42:10,892 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-19 03:42:10,892 INFO L138 SettingsManager]: * Use SBE=true [2020-08-19 03:42:10,892 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-19 03:42:10,892 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-19 03:42:10,892 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-19 03:42:10,893 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-19 03:42:10,893 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-19 03:42:10,893 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-19 03:42:10,893 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-19 03:42:10,893 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-19 03:42:10,893 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-19 03:42:10,894 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-19 03:42:10,894 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-19 03:42:10,894 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-19 03:42:10,894 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-19 03:42:10,894 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-19 03:42:10,895 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-19 03:42:10,895 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-19 03:42:10,895 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-19 03:42:10,895 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-19 03:42:10,895 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-19 03:42:10,896 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-19 03:42:10,896 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-19 03:42:10,896 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-19 03:42:10,896 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-19 03:42:10,896 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-19 03:42:10,897 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 03:42:11,223 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-19 03:42:11,235 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-19 03:42:11,238 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-19 03:42:11,240 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-19 03:42:11,240 INFO L275 PluginConnector]: CDTParser initialized [2020-08-19 03:42:11,241 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/array_1-2.c [2020-08-19 03:42:11,310 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/bdb9336b3/ffc02e56c3d94eb598f45f66b685907b/FLAG93e534efb [2020-08-19 03:42:11,789 INFO L306 CDTParser]: Found 1 translation units. [2020-08-19 03:42:11,789 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-acceleration/array_1-2.c [2020-08-19 03:42:11,795 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/bdb9336b3/ffc02e56c3d94eb598f45f66b685907b/FLAG93e534efb [2020-08-19 03:42:12,145 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/bdb9336b3/ffc02e56c3d94eb598f45f66b685907b [2020-08-19 03:42:12,155 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-19 03:42:12,157 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-19 03:42:12,158 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-19 03:42:12,158 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-19 03:42:12,163 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-19 03:42:12,164 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 03:42:12" (1/1) ... [2020-08-19 03:42:12,168 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1f78b0b2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 03:42:12, skipping insertion in model container [2020-08-19 03:42:12,168 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 03:42:12" (1/1) ... [2020-08-19 03:42:12,178 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-19 03:42:12,198 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-19 03:42:12,398 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-19 03:42:12,403 INFO L203 MainTranslator]: Completed pre-run [2020-08-19 03:42:12,424 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-19 03:42:12,447 INFO L208 MainTranslator]: Completed translation [2020-08-19 03:42:12,448 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 03:42:12 WrapperNode [2020-08-19 03:42:12,448 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-19 03:42:12,449 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-19 03:42:12,449 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-19 03:42:12,449 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-19 03:42:12,549 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 03:42:12" (1/1) ... [2020-08-19 03:42:12,550 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 03:42:12" (1/1) ... [2020-08-19 03:42:12,558 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 03:42:12" (1/1) ... [2020-08-19 03:42:12,558 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 03:42:12" (1/1) ... [2020-08-19 03:42:12,565 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 03:42:12" (1/1) ... [2020-08-19 03:42:12,570 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 03:42:12" (1/1) ... [2020-08-19 03:42:12,571 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 03:42:12" (1/1) ... [2020-08-19 03:42:12,573 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-19 03:42:12,573 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-19 03:42:12,574 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-19 03:42:12,574 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-19 03:42:12,575 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 03:42:12" (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 03:42:12,630 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-19 03:42:12,631 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-19 03:42:12,631 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-19 03:42:12,632 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-19 03:42:12,632 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-19 03:42:12,632 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-19 03:42:12,633 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-19 03:42:12,633 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-19 03:42:12,633 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-19 03:42:12,633 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-19 03:42:12,633 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-19 03:42:12,634 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-19 03:42:12,634 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-19 03:42:12,833 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-19 03:42:12,834 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-19 03:42:12,838 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 03:42:12 BoogieIcfgContainer [2020-08-19 03:42:12,838 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-19 03:42:12,839 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-19 03:42:12,839 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-19 03:42:12,845 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-19 03:42:12,846 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.08 03:42:12" (1/3) ... [2020-08-19 03:42:12,847 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6a765d7d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 03:42:12, skipping insertion in model container [2020-08-19 03:42:12,847 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 03:42:12" (2/3) ... [2020-08-19 03:42:12,847 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6a765d7d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 03:42:12, skipping insertion in model container [2020-08-19 03:42:12,847 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 03:42:12" (3/3) ... [2020-08-19 03:42:12,849 INFO L109 eAbstractionObserver]: Analyzing ICFG array_1-2.c [2020-08-19 03:42:12,859 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-19 03:42:12,865 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-19 03:42:12,880 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-19 03:42:12,902 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-19 03:42:12,903 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-19 03:42:12,903 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-19 03:42:12,903 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-19 03:42:12,903 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-19 03:42:12,903 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-19 03:42:12,903 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-19 03:42:12,904 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-19 03:42:12,922 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2020-08-19 03:42:12,928 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-19 03:42:12,928 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:12,930 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:12,930 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:12,935 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:12,936 INFO L82 PathProgramCache]: Analyzing trace with hash -267856937, now seen corresponding path program 1 times [2020-08-19 03:42:12,945 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:12,945 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1747562703] [2020-08-19 03:42:12,946 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:13,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:13,101 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:13,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:13,124 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 03:42:13,125 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1747562703] [2020-08-19 03:42:13,127 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 03:42:13,128 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-19 03:42:13,129 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [327097288] [2020-08-19 03:42:13,135 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-19 03:42:13,136 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:13,162 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-19 03:42:13,164 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-19 03:42:13,168 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 3 states. [2020-08-19 03:42:13,311 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:13,311 INFO L93 Difference]: Finished difference Result 34 states and 37 transitions. [2020-08-19 03:42:13,312 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-19 03:42:13,313 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 12 [2020-08-19 03:42:13,314 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:13,321 INFO L225 Difference]: With dead ends: 34 [2020-08-19 03:42:13,321 INFO L226 Difference]: Without dead ends: 14 [2020-08-19 03:42:13,324 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-19 03:42:13,339 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-08-19 03:42:13,354 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-08-19 03:42:13,356 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-08-19 03:42:13,357 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2020-08-19 03:42:13,359 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2020-08-19 03:42:13,359 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:13,359 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2020-08-19 03:42:13,360 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-19 03:42:13,360 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2020-08-19 03:42:13,361 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-19 03:42:13,361 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:13,361 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:13,362 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-19 03:42:13,362 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:13,362 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:13,363 INFO L82 PathProgramCache]: Analyzing trace with hash -439631843, now seen corresponding path program 1 times [2020-08-19 03:42:13,363 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:13,364 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [511809337] [2020-08-19 03:42:13,364 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:13,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:13,435 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:13,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:13,444 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 03:42:13,445 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [511809337] [2020-08-19 03:42:13,446 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 03:42:13,446 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-19 03:42:13,446 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1898505857] [2020-08-19 03:42:13,448 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-19 03:42:13,449 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:13,449 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-19 03:42:13,450 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-19 03:42:13,450 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 4 states. [2020-08-19 03:42:13,504 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:13,505 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2020-08-19 03:42:13,505 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-19 03:42:13,505 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 12 [2020-08-19 03:42:13,506 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:13,507 INFO L225 Difference]: With dead ends: 22 [2020-08-19 03:42:13,507 INFO L226 Difference]: Without dead ends: 16 [2020-08-19 03:42:13,508 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-19 03:42:13,509 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-19 03:42:13,513 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2020-08-19 03:42:13,514 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-19 03:42:13,515 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2020-08-19 03:42:13,515 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 12 [2020-08-19 03:42:13,515 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:13,516 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2020-08-19 03:42:13,516 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-19 03:42:13,516 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2020-08-19 03:42:13,516 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-08-19 03:42:13,517 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:13,517 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:13,517 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-19 03:42:13,518 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:13,518 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:13,518 INFO L82 PathProgramCache]: Analyzing trace with hash 1874839487, now seen corresponding path program 1 times [2020-08-19 03:42:13,519 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:13,519 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1048857704] [2020-08-19 03:42:13,519 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:13,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:13,590 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:13,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:13,598 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:13,599 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1048857704] [2020-08-19 03:42:13,599 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:13,600 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-19 03:42:13,600 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1950625563] [2020-08-19 03:42:13,601 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-19 03:42:13,601 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:13,601 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-19 03:42:13,602 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-19 03:42:13,602 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 5 states. [2020-08-19 03:42:13,650 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:13,650 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2020-08-19 03:42:13,651 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-19 03:42:13,651 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-08-19 03:42:13,651 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:13,652 INFO L225 Difference]: With dead ends: 24 [2020-08-19 03:42:13,652 INFO L226 Difference]: Without dead ends: 18 [2020-08-19 03:42:13,653 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-19 03:42:13,654 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-08-19 03:42:13,658 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 17. [2020-08-19 03:42:13,658 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-19 03:42:13,659 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-08-19 03:42:13,659 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 14 [2020-08-19 03:42:13,660 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:13,660 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-08-19 03:42:13,660 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-19 03:42:13,660 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-08-19 03:42:13,661 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-19 03:42:13,661 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:13,661 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:13,662 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-19 03:42:13,662 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:13,662 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:13,662 INFO L82 PathProgramCache]: Analyzing trace with hash 1288728289, now seen corresponding path program 2 times [2020-08-19 03:42:13,663 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:13,663 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [672281931] [2020-08-19 03:42:13,663 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:13,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:13,739 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:13,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:13,747 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:13,747 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [672281931] [2020-08-19 03:42:13,748 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:13,748 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-19 03:42:13,748 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [542845853] [2020-08-19 03:42:13,749 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-19 03:42:13,749 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:13,749 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-19 03:42:13,750 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-19 03:42:13,750 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 6 states. [2020-08-19 03:42:13,801 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:13,802 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2020-08-19 03:42:13,802 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-19 03:42:13,802 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 16 [2020-08-19 03:42:13,803 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:13,803 INFO L225 Difference]: With dead ends: 26 [2020-08-19 03:42:13,804 INFO L226 Difference]: Without dead ends: 20 [2020-08-19 03:42:13,804 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-19 03:42:13,805 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-19 03:42:13,809 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 19. [2020-08-19 03:42:13,809 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-08-19 03:42:13,810 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2020-08-19 03:42:13,810 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 16 [2020-08-19 03:42:13,811 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:13,811 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2020-08-19 03:42:13,811 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-19 03:42:13,811 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2020-08-19 03:42:13,812 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-19 03:42:13,812 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:13,812 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:13,813 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-19 03:42:13,813 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:13,813 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:13,813 INFO L82 PathProgramCache]: Analyzing trace with hash 676582787, now seen corresponding path program 3 times [2020-08-19 03:42:13,814 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:13,814 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1291750029] [2020-08-19 03:42:13,815 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:13,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:13,896 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:13,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:13,903 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 03:42:13,903 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1291750029] [2020-08-19 03:42:13,904 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:13,904 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-19 03:42:13,904 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1402900524] [2020-08-19 03:42:13,905 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-19 03:42:13,905 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:13,905 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-19 03:42:13,906 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-08-19 03:42:13,906 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 7 states. [2020-08-19 03:42:13,964 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:13,965 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2020-08-19 03:42:13,965 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-19 03:42:13,966 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 18 [2020-08-19 03:42:13,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:13,967 INFO L225 Difference]: With dead ends: 28 [2020-08-19 03:42:13,967 INFO L226 Difference]: Without dead ends: 22 [2020-08-19 03:42:13,968 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-08-19 03:42:13,968 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-19 03:42:13,972 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2020-08-19 03:42:13,973 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-19 03:42:13,974 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2020-08-19 03:42:13,974 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 18 [2020-08-19 03:42:13,974 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:13,974 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2020-08-19 03:42:13,975 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-19 03:42:13,975 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2020-08-19 03:42:13,975 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-19 03:42:13,976 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:13,976 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:13,976 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-19 03:42:13,976 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:13,977 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:13,977 INFO L82 PathProgramCache]: Analyzing trace with hash 815274917, now seen corresponding path program 4 times [2020-08-19 03:42:13,977 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:13,978 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1224905041] [2020-08-19 03:42:13,978 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:14,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:14,117 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:14,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:14,125 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:14,126 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1224905041] [2020-08-19 03:42:14,126 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:14,126 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-19 03:42:14,127 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1359344452] [2020-08-19 03:42:14,128 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-19 03:42:14,129 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:14,129 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-19 03:42:14,129 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-08-19 03:42:14,129 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 8 states. [2020-08-19 03:42:14,197 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:14,197 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2020-08-19 03:42:14,198 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-19 03:42:14,198 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 20 [2020-08-19 03:42:14,199 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:14,200 INFO L225 Difference]: With dead ends: 30 [2020-08-19 03:42:14,200 INFO L226 Difference]: Without dead ends: 24 [2020-08-19 03:42:14,200 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-08-19 03:42:14,202 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-19 03:42:14,208 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2020-08-19 03:42:14,210 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-19 03:42:14,211 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2020-08-19 03:42:14,211 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 20 [2020-08-19 03:42:14,212 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:14,218 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2020-08-19 03:42:14,218 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-19 03:42:14,218 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2020-08-19 03:42:14,219 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-19 03:42:14,219 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:14,219 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:14,220 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-19 03:42:14,222 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:14,222 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:14,222 INFO L82 PathProgramCache]: Analyzing trace with hash 954425671, now seen corresponding path program 5 times [2020-08-19 03:42:14,223 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:14,223 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [821581421] [2020-08-19 03:42:14,223 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:14,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:14,321 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:14,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:14,326 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:14,327 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [821581421] [2020-08-19 03:42:14,327 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:14,327 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-19 03:42:14,327 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2129780019] [2020-08-19 03:42:14,328 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-19 03:42:14,328 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:14,328 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-19 03:42:14,329 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2020-08-19 03:42:14,329 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 9 states. [2020-08-19 03:42:14,386 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:14,386 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2020-08-19 03:42:14,386 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-19 03:42:14,387 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 22 [2020-08-19 03:42:14,387 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:14,388 INFO L225 Difference]: With dead ends: 32 [2020-08-19 03:42:14,388 INFO L226 Difference]: Without dead ends: 26 [2020-08-19 03:42:14,389 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2020-08-19 03:42:14,389 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-19 03:42:14,393 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2020-08-19 03:42:14,393 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-19 03:42:14,394 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2020-08-19 03:42:14,395 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 22 [2020-08-19 03:42:14,395 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:14,395 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2020-08-19 03:42:14,395 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-19 03:42:14,396 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2020-08-19 03:42:14,396 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-19 03:42:14,396 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:14,397 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:14,397 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-19 03:42:14,397 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:14,397 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:14,398 INFO L82 PathProgramCache]: Analyzing trace with hash 1534314089, now seen corresponding path program 6 times [2020-08-19 03:42:14,398 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:14,398 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [522077955] [2020-08-19 03:42:14,398 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:14,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:14,485 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:14,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:14,491 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:14,491 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [522077955] [2020-08-19 03:42:14,491 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:14,492 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-19 03:42:14,492 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [452941307] [2020-08-19 03:42:14,492 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-19 03:42:14,493 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:14,493 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-19 03:42:14,493 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2020-08-19 03:42:14,494 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 10 states. [2020-08-19 03:42:14,566 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:14,566 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2020-08-19 03:42:14,567 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-19 03:42:14,567 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 24 [2020-08-19 03:42:14,567 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:14,568 INFO L225 Difference]: With dead ends: 34 [2020-08-19 03:42:14,568 INFO L226 Difference]: Without dead ends: 28 [2020-08-19 03:42:14,569 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2020-08-19 03:42:14,569 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-19 03:42:14,573 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2020-08-19 03:42:14,573 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-19 03:42:14,574 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2020-08-19 03:42:14,574 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 24 [2020-08-19 03:42:14,575 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:14,575 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2020-08-19 03:42:14,575 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-19 03:42:14,575 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2020-08-19 03:42:14,576 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-19 03:42:14,576 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:14,576 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:14,576 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-19 03:42:14,577 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:14,577 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:14,577 INFO L82 PathProgramCache]: Analyzing trace with hash 461335307, now seen corresponding path program 7 times [2020-08-19 03:42:14,577 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:14,578 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [373956457] [2020-08-19 03:42:14,578 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:14,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:14,679 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:14,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:14,684 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:14,684 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [373956457] [2020-08-19 03:42:14,685 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:14,685 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-19 03:42:14,685 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1549425960] [2020-08-19 03:42:14,686 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-19 03:42:14,686 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:14,686 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-19 03:42:14,687 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2020-08-19 03:42:14,687 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 11 states. [2020-08-19 03:42:14,764 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:14,764 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2020-08-19 03:42:14,764 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-19 03:42:14,765 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 26 [2020-08-19 03:42:14,765 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:14,766 INFO L225 Difference]: With dead ends: 36 [2020-08-19 03:42:14,766 INFO L226 Difference]: Without dead ends: 30 [2020-08-19 03:42:14,767 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2020-08-19 03:42:14,770 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-19 03:42:14,777 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2020-08-19 03:42:14,777 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-19 03:42:14,778 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2020-08-19 03:42:14,778 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 26 [2020-08-19 03:42:14,779 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:14,780 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2020-08-19 03:42:14,780 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-19 03:42:14,780 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2020-08-19 03:42:14,781 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-19 03:42:14,781 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:14,781 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:14,781 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-19 03:42:14,782 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:14,784 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:14,785 INFO L82 PathProgramCache]: Analyzing trace with hash 120876845, now seen corresponding path program 8 times [2020-08-19 03:42:14,785 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:14,785 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2068775911] [2020-08-19 03:42:14,786 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:14,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:14,928 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:14,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:14,934 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:14,935 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2068775911] [2020-08-19 03:42:14,936 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:14,936 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-19 03:42:14,936 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1725901664] [2020-08-19 03:42:14,937 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-19 03:42:14,937 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:14,937 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-19 03:42:14,938 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2020-08-19 03:42:14,938 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 12 states. [2020-08-19 03:42:15,022 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:15,022 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2020-08-19 03:42:15,023 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-19 03:42:15,023 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 28 [2020-08-19 03:42:15,023 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:15,025 INFO L225 Difference]: With dead ends: 38 [2020-08-19 03:42:15,026 INFO L226 Difference]: Without dead ends: 32 [2020-08-19 03:42:15,027 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2020-08-19 03:42:15,027 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-19 03:42:15,033 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2020-08-19 03:42:15,033 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-19 03:42:15,035 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2020-08-19 03:42:15,035 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 28 [2020-08-19 03:42:15,036 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:15,036 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2020-08-19 03:42:15,036 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-19 03:42:15,036 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2020-08-19 03:42:15,040 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-19 03:42:15,041 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:15,041 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:15,041 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-19 03:42:15,041 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:15,043 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:15,043 INFO L82 PathProgramCache]: Analyzing trace with hash -642190641, now seen corresponding path program 9 times [2020-08-19 03:42:15,044 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:15,044 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [958631358] [2020-08-19 03:42:15,044 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:15,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:15,210 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:15,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:15,215 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:15,215 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [958631358] [2020-08-19 03:42:15,216 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:15,216 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-19 03:42:15,216 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [710202774] [2020-08-19 03:42:15,217 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-19 03:42:15,217 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:15,217 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-19 03:42:15,217 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2020-08-19 03:42:15,218 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 13 states. [2020-08-19 03:42:15,283 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:15,283 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2020-08-19 03:42:15,284 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-19 03:42:15,284 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 30 [2020-08-19 03:42:15,284 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:15,285 INFO L225 Difference]: With dead ends: 40 [2020-08-19 03:42:15,285 INFO L226 Difference]: Without dead ends: 34 [2020-08-19 03:42:15,286 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2020-08-19 03:42:15,287 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-19 03:42:15,290 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2020-08-19 03:42:15,291 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-19 03:42:15,291 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2020-08-19 03:42:15,292 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 30 [2020-08-19 03:42:15,292 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:15,292 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2020-08-19 03:42:15,292 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-19 03:42:15,292 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2020-08-19 03:42:15,293 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-19 03:42:15,293 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:15,293 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:15,294 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-19 03:42:15,294 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:15,294 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:15,294 INFO L82 PathProgramCache]: Analyzing trace with hash 489362929, now seen corresponding path program 10 times [2020-08-19 03:42:15,294 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:15,295 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [546196702] [2020-08-19 03:42:15,295 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:15,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:15,422 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:15,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:15,427 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:15,427 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [546196702] [2020-08-19 03:42:15,427 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:15,427 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-19 03:42:15,428 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [484246613] [2020-08-19 03:42:15,428 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-19 03:42:15,428 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:15,428 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-19 03:42:15,429 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2020-08-19 03:42:15,429 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 14 states. [2020-08-19 03:42:15,490 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:15,491 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2020-08-19 03:42:15,491 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-19 03:42:15,491 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 32 [2020-08-19 03:42:15,491 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:15,492 INFO L225 Difference]: With dead ends: 42 [2020-08-19 03:42:15,492 INFO L226 Difference]: Without dead ends: 36 [2020-08-19 03:42:15,493 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2020-08-19 03:42:15,493 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-19 03:42:15,497 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2020-08-19 03:42:15,497 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-19 03:42:15,497 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2020-08-19 03:42:15,498 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 32 [2020-08-19 03:42:15,498 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:15,498 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2020-08-19 03:42:15,498 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-19 03:42:15,498 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2020-08-19 03:42:15,499 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-19 03:42:15,499 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:15,499 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:15,500 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-19 03:42:15,500 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:15,500 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:15,500 INFO L82 PathProgramCache]: Analyzing trace with hash 1285617811, now seen corresponding path program 11 times [2020-08-19 03:42:15,500 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:15,501 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1162723700] [2020-08-19 03:42:15,501 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:15,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:15,658 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:15,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:15,663 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:15,663 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1162723700] [2020-08-19 03:42:15,663 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:15,663 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-19 03:42:15,664 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1778156921] [2020-08-19 03:42:15,664 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-19 03:42:15,664 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:15,665 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-19 03:42:15,665 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2020-08-19 03:42:15,665 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 15 states. [2020-08-19 03:42:15,761 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:15,762 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2020-08-19 03:42:15,762 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-19 03:42:15,762 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 34 [2020-08-19 03:42:15,763 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:15,763 INFO L225 Difference]: With dead ends: 44 [2020-08-19 03:42:15,763 INFO L226 Difference]: Without dead ends: 38 [2020-08-19 03:42:15,764 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2020-08-19 03:42:15,764 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-19 03:42:15,771 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2020-08-19 03:42:15,771 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-19 03:42:15,772 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2020-08-19 03:42:15,772 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 34 [2020-08-19 03:42:15,772 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:15,772 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2020-08-19 03:42:15,772 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-19 03:42:15,773 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2020-08-19 03:42:15,773 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-19 03:42:15,773 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:15,774 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:15,774 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-19 03:42:15,774 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:15,774 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:15,774 INFO L82 PathProgramCache]: Analyzing trace with hash 1982380725, now seen corresponding path program 12 times [2020-08-19 03:42:15,775 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:15,775 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1513957073] [2020-08-19 03:42:15,775 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:15,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:15,926 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:15,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:15,930 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:15,931 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1513957073] [2020-08-19 03:42:15,931 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:15,931 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-19 03:42:15,932 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1377621080] [2020-08-19 03:42:15,932 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-19 03:42:15,932 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:15,933 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-19 03:42:15,933 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2020-08-19 03:42:15,934 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 16 states. [2020-08-19 03:42:15,998 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:15,998 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2020-08-19 03:42:15,998 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-19 03:42:15,999 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 36 [2020-08-19 03:42:15,999 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:15,999 INFO L225 Difference]: With dead ends: 46 [2020-08-19 03:42:16,000 INFO L226 Difference]: Without dead ends: 40 [2020-08-19 03:42:16,000 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2020-08-19 03:42:16,000 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-19 03:42:16,006 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2020-08-19 03:42:16,007 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-19 03:42:16,008 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2020-08-19 03:42:16,009 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 36 [2020-08-19 03:42:16,009 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:16,009 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2020-08-19 03:42:16,009 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-19 03:42:16,009 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2020-08-19 03:42:16,013 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-19 03:42:16,013 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:16,013 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:16,014 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-19 03:42:16,014 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:16,014 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:16,014 INFO L82 PathProgramCache]: Analyzing trace with hash 1556642903, now seen corresponding path program 13 times [2020-08-19 03:42:16,014 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:16,017 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [417487920] [2020-08-19 03:42:16,017 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:16,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:16,176 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:16,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:16,181 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:16,182 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [417487920] [2020-08-19 03:42:16,182 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:16,182 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-19 03:42:16,183 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [439902250] [2020-08-19 03:42:16,183 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-19 03:42:16,184 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:16,184 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-19 03:42:16,184 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2020-08-19 03:42:16,185 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 17 states. [2020-08-19 03:42:16,285 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:16,285 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2020-08-19 03:42:16,286 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-19 03:42:16,286 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 38 [2020-08-19 03:42:16,286 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:16,287 INFO L225 Difference]: With dead ends: 48 [2020-08-19 03:42:16,287 INFO L226 Difference]: Without dead ends: 42 [2020-08-19 03:42:16,288 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2020-08-19 03:42:16,288 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-19 03:42:16,292 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2020-08-19 03:42:16,292 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-19 03:42:16,293 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2020-08-19 03:42:16,293 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 38 [2020-08-19 03:42:16,294 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:16,294 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2020-08-19 03:42:16,294 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-19 03:42:16,294 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2020-08-19 03:42:16,295 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-19 03:42:16,295 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:16,295 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:16,295 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-19 03:42:16,295 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:16,296 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:16,296 INFO L82 PathProgramCache]: Analyzing trace with hash 444489081, now seen corresponding path program 14 times [2020-08-19 03:42:16,296 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:16,296 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1105144290] [2020-08-19 03:42:16,296 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:16,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:16,487 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:16,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:16,492 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:16,492 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1105144290] [2020-08-19 03:42:16,492 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:16,493 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-19 03:42:16,493 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1871714354] [2020-08-19 03:42:16,493 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-19 03:42:16,494 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:16,494 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-19 03:42:16,494 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2020-08-19 03:42:16,494 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 18 states. [2020-08-19 03:42:16,601 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:16,611 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2020-08-19 03:42:16,611 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-19 03:42:16,611 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 40 [2020-08-19 03:42:16,612 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:16,612 INFO L225 Difference]: With dead ends: 50 [2020-08-19 03:42:16,612 INFO L226 Difference]: Without dead ends: 44 [2020-08-19 03:42:16,613 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2020-08-19 03:42:16,614 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-19 03:42:16,617 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2020-08-19 03:42:16,618 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-19 03:42:16,618 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2020-08-19 03:42:16,618 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 40 [2020-08-19 03:42:16,619 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:16,619 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2020-08-19 03:42:16,619 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-19 03:42:16,619 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2020-08-19 03:42:16,621 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-19 03:42:16,621 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:16,621 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:16,622 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-19 03:42:16,622 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:16,622 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:16,622 INFO L82 PathProgramCache]: Analyzing trace with hash 1111522843, now seen corresponding path program 15 times [2020-08-19 03:42:16,622 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:16,623 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1402237648] [2020-08-19 03:42:16,623 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:16,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:16,823 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:16,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:16,827 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:16,828 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1402237648] [2020-08-19 03:42:16,828 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:16,828 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-19 03:42:16,828 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1047149515] [2020-08-19 03:42:16,829 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-19 03:42:16,829 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:16,829 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-19 03:42:16,830 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2020-08-19 03:42:16,830 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 19 states. [2020-08-19 03:42:16,936 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:16,937 INFO L93 Difference]: Finished difference Result 52 states and 52 transitions. [2020-08-19 03:42:16,937 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-19 03:42:16,937 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 42 [2020-08-19 03:42:16,937 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:16,938 INFO L225 Difference]: With dead ends: 52 [2020-08-19 03:42:16,938 INFO L226 Difference]: Without dead ends: 46 [2020-08-19 03:42:16,939 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2020-08-19 03:42:16,939 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-19 03:42:16,941 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2020-08-19 03:42:16,942 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-19 03:42:16,942 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2020-08-19 03:42:16,942 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 42 [2020-08-19 03:42:16,942 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:16,942 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2020-08-19 03:42:16,943 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-19 03:42:16,943 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2020-08-19 03:42:16,943 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-19 03:42:16,944 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:16,944 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:16,944 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-19 03:42:16,944 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:16,944 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:16,945 INFO L82 PathProgramCache]: Analyzing trace with hash -2114126275, now seen corresponding path program 16 times [2020-08-19 03:42:16,945 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:16,945 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1878867789] [2020-08-19 03:42:16,945 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:16,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:17,174 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:17,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:17,180 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:17,180 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1878867789] [2020-08-19 03:42:17,181 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:17,181 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-19 03:42:17,181 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [686707648] [2020-08-19 03:42:17,181 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-19 03:42:17,182 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:17,182 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-19 03:42:17,182 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2020-08-19 03:42:17,182 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 20 states. [2020-08-19 03:42:17,314 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:17,314 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2020-08-19 03:42:17,314 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-19 03:42:17,314 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 44 [2020-08-19 03:42:17,315 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:17,315 INFO L225 Difference]: With dead ends: 54 [2020-08-19 03:42:17,315 INFO L226 Difference]: Without dead ends: 48 [2020-08-19 03:42:17,316 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2020-08-19 03:42:17,317 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-19 03:42:17,321 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 47. [2020-08-19 03:42:17,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-19 03:42:17,322 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2020-08-19 03:42:17,322 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 44 [2020-08-19 03:42:17,322 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:17,322 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2020-08-19 03:42:17,322 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-19 03:42:17,323 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2020-08-19 03:42:17,323 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-19 03:42:17,323 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:17,323 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:17,324 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-19 03:42:17,324 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:17,324 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:17,324 INFO L82 PathProgramCache]: Analyzing trace with hash -996540961, now seen corresponding path program 17 times [2020-08-19 03:42:17,324 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:17,325 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1168879992] [2020-08-19 03:42:17,325 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:17,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:17,603 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:17,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:17,608 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:17,608 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1168879992] [2020-08-19 03:42:17,609 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:17,609 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-19 03:42:17,609 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1985444507] [2020-08-19 03:42:17,610 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-19 03:42:17,610 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:17,610 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-19 03:42:17,610 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2020-08-19 03:42:17,611 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 21 states. [2020-08-19 03:42:17,693 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:17,693 INFO L93 Difference]: Finished difference Result 56 states and 56 transitions. [2020-08-19 03:42:17,694 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-19 03:42:17,694 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 46 [2020-08-19 03:42:17,694 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:17,694 INFO L225 Difference]: With dead ends: 56 [2020-08-19 03:42:17,695 INFO L226 Difference]: Without dead ends: 50 [2020-08-19 03:42:17,695 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2020-08-19 03:42:17,696 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-08-19 03:42:17,699 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 49. [2020-08-19 03:42:17,700 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-19 03:42:17,700 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2020-08-19 03:42:17,700 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 46 [2020-08-19 03:42:17,701 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:17,701 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2020-08-19 03:42:17,701 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-19 03:42:17,701 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2020-08-19 03:42:17,702 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-19 03:42:17,702 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:17,702 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:17,702 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-19 03:42:17,702 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:17,703 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:17,703 INFO L82 PathProgramCache]: Analyzing trace with hash -738878207, now seen corresponding path program 18 times [2020-08-19 03:42:17,703 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:17,703 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [180149512] [2020-08-19 03:42:17,703 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:17,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:17,971 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:17,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:17,976 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:17,977 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [180149512] [2020-08-19 03:42:17,977 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:17,977 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-19 03:42:17,978 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [910215015] [2020-08-19 03:42:17,978 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-19 03:42:17,978 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:17,979 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-19 03:42:17,979 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2020-08-19 03:42:17,979 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand 22 states. [2020-08-19 03:42:18,061 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:18,061 INFO L93 Difference]: Finished difference Result 58 states and 58 transitions. [2020-08-19 03:42:18,061 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-19 03:42:18,062 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 48 [2020-08-19 03:42:18,062 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:18,062 INFO L225 Difference]: With dead ends: 58 [2020-08-19 03:42:18,062 INFO L226 Difference]: Without dead ends: 52 [2020-08-19 03:42:18,063 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2020-08-19 03:42:18,064 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-19 03:42:18,071 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2020-08-19 03:42:18,071 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-19 03:42:18,072 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2020-08-19 03:42:18,072 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 48 [2020-08-19 03:42:18,072 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:18,072 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2020-08-19 03:42:18,072 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-19 03:42:18,072 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2020-08-19 03:42:18,078 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-19 03:42:18,079 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:18,079 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:18,079 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-19 03:42:18,079 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:18,080 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:18,080 INFO L82 PathProgramCache]: Analyzing trace with hash 2061892515, now seen corresponding path program 19 times [2020-08-19 03:42:18,081 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:18,081 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2011876721] [2020-08-19 03:42:18,081 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:18,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:18,415 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:18,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:18,432 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:18,433 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2011876721] [2020-08-19 03:42:18,433 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:18,433 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-19 03:42:18,433 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [467482447] [2020-08-19 03:42:18,434 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-19 03:42:18,434 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:18,434 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-19 03:42:18,435 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2020-08-19 03:42:18,435 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 23 states. [2020-08-19 03:42:18,586 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:18,587 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2020-08-19 03:42:18,587 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-19 03:42:18,587 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 50 [2020-08-19 03:42:18,588 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:18,588 INFO L225 Difference]: With dead ends: 60 [2020-08-19 03:42:18,588 INFO L226 Difference]: Without dead ends: 54 [2020-08-19 03:42:18,589 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2020-08-19 03:42:18,589 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-19 03:42:18,600 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2020-08-19 03:42:18,600 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-19 03:42:18,601 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2020-08-19 03:42:18,601 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 50 [2020-08-19 03:42:18,601 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:18,601 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2020-08-19 03:42:18,601 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-19 03:42:18,601 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2020-08-19 03:42:18,602 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-19 03:42:18,602 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:18,603 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:18,603 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-19 03:42:18,603 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:18,603 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:18,603 INFO L82 PathProgramCache]: Analyzing trace with hash 658061765, now seen corresponding path program 20 times [2020-08-19 03:42:18,604 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:18,607 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1664894533] [2020-08-19 03:42:18,607 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:18,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:18,943 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:18,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:18,948 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:18,949 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1664894533] [2020-08-19 03:42:18,949 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:18,949 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-19 03:42:18,949 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1753944280] [2020-08-19 03:42:18,950 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-19 03:42:18,950 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:18,950 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-19 03:42:18,951 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=255, Invalid=297, Unknown=0, NotChecked=0, Total=552 [2020-08-19 03:42:18,951 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 24 states. [2020-08-19 03:42:19,043 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:19,043 INFO L93 Difference]: Finished difference Result 62 states and 62 transitions. [2020-08-19 03:42:19,046 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-19 03:42:19,046 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 52 [2020-08-19 03:42:19,047 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:19,047 INFO L225 Difference]: With dead ends: 62 [2020-08-19 03:42:19,047 INFO L226 Difference]: Without dead ends: 56 [2020-08-19 03:42:19,048 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=255, Invalid=297, Unknown=0, NotChecked=0, Total=552 [2020-08-19 03:42:19,049 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-08-19 03:42:19,051 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2020-08-19 03:42:19,051 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-19 03:42:19,053 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2020-08-19 03:42:19,053 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 52 [2020-08-19 03:42:19,054 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:19,054 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2020-08-19 03:42:19,054 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-19 03:42:19,054 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2020-08-19 03:42:19,055 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-19 03:42:19,055 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:19,055 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:19,055 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-19 03:42:19,055 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:19,056 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:19,056 INFO L82 PathProgramCache]: Analyzing trace with hash 196441959, now seen corresponding path program 21 times [2020-08-19 03:42:19,056 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:19,056 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2060908971] [2020-08-19 03:42:19,056 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:19,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:19,371 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:19,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:19,380 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:19,380 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2060908971] [2020-08-19 03:42:19,380 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:19,380 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-19 03:42:19,381 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [740490380] [2020-08-19 03:42:19,381 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-19 03:42:19,381 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:19,382 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-19 03:42:19,382 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=278, Invalid=322, Unknown=0, NotChecked=0, Total=600 [2020-08-19 03:42:19,382 INFO L87 Difference]: Start difference. First operand 55 states and 55 transitions. Second operand 25 states. [2020-08-19 03:42:19,527 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:19,527 INFO L93 Difference]: Finished difference Result 64 states and 64 transitions. [2020-08-19 03:42:19,527 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-19 03:42:19,527 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 54 [2020-08-19 03:42:19,528 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:19,528 INFO L225 Difference]: With dead ends: 64 [2020-08-19 03:42:19,528 INFO L226 Difference]: Without dead ends: 58 [2020-08-19 03:42:19,529 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=278, Invalid=322, Unknown=0, NotChecked=0, Total=600 [2020-08-19 03:42:19,529 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-19 03:42:19,532 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2020-08-19 03:42:19,533 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-19 03:42:19,533 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2020-08-19 03:42:19,533 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 54 [2020-08-19 03:42:19,534 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:19,534 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2020-08-19 03:42:19,534 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-19 03:42:19,534 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2020-08-19 03:42:19,535 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-19 03:42:19,535 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:19,535 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:19,535 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-19 03:42:19,535 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:19,535 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:19,536 INFO L82 PathProgramCache]: Analyzing trace with hash -1038560119, now seen corresponding path program 22 times [2020-08-19 03:42:19,536 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:19,536 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2119779517] [2020-08-19 03:42:19,536 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:19,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:19,918 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:19,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:19,924 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:19,925 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2119779517] [2020-08-19 03:42:19,925 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:19,925 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-19 03:42:19,925 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2035822153] [2020-08-19 03:42:19,926 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-19 03:42:19,926 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:19,926 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-19 03:42:19,927 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=302, Invalid=348, Unknown=0, NotChecked=0, Total=650 [2020-08-19 03:42:19,927 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 26 states. [2020-08-19 03:42:20,063 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:20,063 INFO L93 Difference]: Finished difference Result 66 states and 66 transitions. [2020-08-19 03:42:20,064 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-19 03:42:20,064 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 56 [2020-08-19 03:42:20,064 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:20,065 INFO L225 Difference]: With dead ends: 66 [2020-08-19 03:42:20,065 INFO L226 Difference]: Without dead ends: 60 [2020-08-19 03:42:20,066 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=302, Invalid=348, Unknown=0, NotChecked=0, Total=650 [2020-08-19 03:42:20,066 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-08-19 03:42:20,069 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 59. [2020-08-19 03:42:20,070 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-08-19 03:42:20,070 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 59 transitions. [2020-08-19 03:42:20,070 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 59 transitions. Word has length 56 [2020-08-19 03:42:20,070 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:20,071 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 59 transitions. [2020-08-19 03:42:20,071 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-19 03:42:20,071 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 59 transitions. [2020-08-19 03:42:20,074 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-08-19 03:42:20,075 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:20,075 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:20,076 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-19 03:42:20,078 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:20,078 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:20,078 INFO L82 PathProgramCache]: Analyzing trace with hash 1830383915, now seen corresponding path program 23 times [2020-08-19 03:42:20,078 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:20,079 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2083620445] [2020-08-19 03:42:20,079 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:20,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:20,487 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:20,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:20,493 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:20,493 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2083620445] [2020-08-19 03:42:20,494 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:20,494 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-19 03:42:20,494 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1604217936] [2020-08-19 03:42:20,494 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-19 03:42:20,494 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:20,495 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-19 03:42:20,495 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=327, Invalid=375, Unknown=0, NotChecked=0, Total=702 [2020-08-19 03:42:20,495 INFO L87 Difference]: Start difference. First operand 59 states and 59 transitions. Second operand 27 states. [2020-08-19 03:42:20,683 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:20,683 INFO L93 Difference]: Finished difference Result 68 states and 68 transitions. [2020-08-19 03:42:20,683 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-19 03:42:20,684 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 58 [2020-08-19 03:42:20,684 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:20,685 INFO L225 Difference]: With dead ends: 68 [2020-08-19 03:42:20,685 INFO L226 Difference]: Without dead ends: 62 [2020-08-19 03:42:20,686 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=327, Invalid=375, Unknown=0, NotChecked=0, Total=702 [2020-08-19 03:42:20,686 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-08-19 03:42:20,690 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2020-08-19 03:42:20,690 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-08-19 03:42:20,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 61 transitions. [2020-08-19 03:42:20,691 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 61 transitions. Word has length 58 [2020-08-19 03:42:20,691 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:20,692 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 61 transitions. [2020-08-19 03:42:20,692 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-19 03:42:20,692 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 61 transitions. [2020-08-19 03:42:20,692 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2020-08-19 03:42:20,693 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:20,693 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:20,693 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-19 03:42:20,693 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:20,693 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:20,694 INFO L82 PathProgramCache]: Analyzing trace with hash 1516596557, now seen corresponding path program 24 times [2020-08-19 03:42:20,694 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:20,694 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [933972032] [2020-08-19 03:42:20,694 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:20,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:21,106 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:21,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:21,112 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:21,112 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [933972032] [2020-08-19 03:42:21,113 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:21,113 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-19 03:42:21,113 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1588618391] [2020-08-19 03:42:21,114 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-19 03:42:21,115 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:21,115 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-19 03:42:21,116 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=353, Invalid=403, Unknown=0, NotChecked=0, Total=756 [2020-08-19 03:42:21,116 INFO L87 Difference]: Start difference. First operand 61 states and 61 transitions. Second operand 28 states. [2020-08-19 03:42:21,287 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:21,287 INFO L93 Difference]: Finished difference Result 70 states and 70 transitions. [2020-08-19 03:42:21,287 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-19 03:42:21,288 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 60 [2020-08-19 03:42:21,288 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:21,288 INFO L225 Difference]: With dead ends: 70 [2020-08-19 03:42:21,289 INFO L226 Difference]: Without dead ends: 64 [2020-08-19 03:42:21,289 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=353, Invalid=403, Unknown=0, NotChecked=0, Total=756 [2020-08-19 03:42:21,290 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-08-19 03:42:21,292 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2020-08-19 03:42:21,292 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2020-08-19 03:42:21,293 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 63 transitions. [2020-08-19 03:42:21,293 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 63 transitions. Word has length 60 [2020-08-19 03:42:21,293 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:21,293 INFO L479 AbstractCegarLoop]: Abstraction has 63 states and 63 transitions. [2020-08-19 03:42:21,294 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-19 03:42:21,294 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 63 transitions. [2020-08-19 03:42:21,294 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2020-08-19 03:42:21,294 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:21,295 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:21,295 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-19 03:42:21,295 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:21,295 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:21,295 INFO L82 PathProgramCache]: Analyzing trace with hash 614656239, now seen corresponding path program 25 times [2020-08-19 03:42:21,295 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:21,296 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1930134861] [2020-08-19 03:42:21,296 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:21,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:21,752 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:21,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:21,759 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 0 proven. 625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:21,759 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1930134861] [2020-08-19 03:42:21,760 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:21,760 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-19 03:42:21,760 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1911141959] [2020-08-19 03:42:21,760 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-19 03:42:21,761 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:21,761 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-19 03:42:21,761 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=380, Invalid=432, Unknown=0, NotChecked=0, Total=812 [2020-08-19 03:42:21,762 INFO L87 Difference]: Start difference. First operand 63 states and 63 transitions. Second operand 29 states. [2020-08-19 03:42:21,928 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:21,929 INFO L93 Difference]: Finished difference Result 72 states and 72 transitions. [2020-08-19 03:42:21,929 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-19 03:42:21,929 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 62 [2020-08-19 03:42:21,930 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:21,930 INFO L225 Difference]: With dead ends: 72 [2020-08-19 03:42:21,931 INFO L226 Difference]: Without dead ends: 66 [2020-08-19 03:42:21,932 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=380, Invalid=432, Unknown=0, NotChecked=0, Total=812 [2020-08-19 03:42:21,932 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-08-19 03:42:21,936 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2020-08-19 03:42:21,936 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-08-19 03:42:21,937 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 65 transitions. [2020-08-19 03:42:21,937 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 65 transitions. Word has length 62 [2020-08-19 03:42:21,937 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:21,938 INFO L479 AbstractCegarLoop]: Abstraction has 65 states and 65 transitions. [2020-08-19 03:42:21,938 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-19 03:42:21,938 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 65 transitions. [2020-08-19 03:42:21,938 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2020-08-19 03:42:21,938 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:21,939 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:21,939 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-19 03:42:21,939 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:21,939 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:21,939 INFO L82 PathProgramCache]: Analyzing trace with hash 1433404433, now seen corresponding path program 26 times [2020-08-19 03:42:21,940 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:21,940 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [208767289] [2020-08-19 03:42:21,940 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:21,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:22,390 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:22,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:22,397 INFO L134 CoverageAnalysis]: Checked inductivity of 676 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:22,397 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [208767289] [2020-08-19 03:42:22,397 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:22,397 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-19 03:42:22,398 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1033299813] [2020-08-19 03:42:22,398 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-19 03:42:22,398 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:22,398 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-19 03:42:22,399 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=408, Invalid=462, Unknown=0, NotChecked=0, Total=870 [2020-08-19 03:42:22,399 INFO L87 Difference]: Start difference. First operand 65 states and 65 transitions. Second operand 30 states. [2020-08-19 03:42:22,575 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:22,575 INFO L93 Difference]: Finished difference Result 74 states and 74 transitions. [2020-08-19 03:42:22,576 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-19 03:42:22,576 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 64 [2020-08-19 03:42:22,576 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:22,577 INFO L225 Difference]: With dead ends: 74 [2020-08-19 03:42:22,577 INFO L226 Difference]: Without dead ends: 68 [2020-08-19 03:42:22,578 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=408, Invalid=462, Unknown=0, NotChecked=0, Total=870 [2020-08-19 03:42:22,578 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-08-19 03:42:22,581 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 67. [2020-08-19 03:42:22,581 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-08-19 03:42:22,582 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 67 transitions. [2020-08-19 03:42:22,582 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 67 transitions. Word has length 64 [2020-08-19 03:42:22,582 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:22,582 INFO L479 AbstractCegarLoop]: Abstraction has 67 states and 67 transitions. [2020-08-19 03:42:22,582 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-19 03:42:22,582 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 67 transitions. [2020-08-19 03:42:22,583 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2020-08-19 03:42:22,583 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:22,583 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:22,584 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-19 03:42:22,584 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:22,584 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:22,584 INFO L82 PathProgramCache]: Analyzing trace with hash -2023563597, now seen corresponding path program 27 times [2020-08-19 03:42:22,584 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:22,584 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [874880174] [2020-08-19 03:42:22,585 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:22,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:23,104 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:23,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:23,113 INFO L134 CoverageAnalysis]: Checked inductivity of 729 backedges. 0 proven. 729 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:23,114 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [874880174] [2020-08-19 03:42:23,114 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:23,114 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-19 03:42:23,114 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2021681088] [2020-08-19 03:42:23,115 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-19 03:42:23,115 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:23,116 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-19 03:42:23,116 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=437, Invalid=493, Unknown=0, NotChecked=0, Total=930 [2020-08-19 03:42:23,117 INFO L87 Difference]: Start difference. First operand 67 states and 67 transitions. Second operand 31 states. [2020-08-19 03:42:23,329 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:23,329 INFO L93 Difference]: Finished difference Result 76 states and 76 transitions. [2020-08-19 03:42:23,329 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-19 03:42:23,330 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 66 [2020-08-19 03:42:23,330 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:23,331 INFO L225 Difference]: With dead ends: 76 [2020-08-19 03:42:23,331 INFO L226 Difference]: Without dead ends: 70 [2020-08-19 03:42:23,332 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=437, Invalid=493, Unknown=0, NotChecked=0, Total=930 [2020-08-19 03:42:23,332 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-08-19 03:42:23,336 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 69. [2020-08-19 03:42:23,337 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2020-08-19 03:42:23,337 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 69 transitions. [2020-08-19 03:42:23,337 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 69 transitions. Word has length 66 [2020-08-19 03:42:23,338 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:23,338 INFO L479 AbstractCegarLoop]: Abstraction has 69 states and 69 transitions. [2020-08-19 03:42:23,338 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-19 03:42:23,338 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 69 transitions. [2020-08-19 03:42:23,339 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-08-19 03:42:23,340 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:23,340 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:23,340 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-19 03:42:23,340 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:23,341 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:23,341 INFO L82 PathProgramCache]: Analyzing trace with hash 134846677, now seen corresponding path program 28 times [2020-08-19 03:42:23,341 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:23,342 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1053740457] [2020-08-19 03:42:23,342 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:23,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:23,895 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:23,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:23,903 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:23,903 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1053740457] [2020-08-19 03:42:23,904 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:23,904 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-19 03:42:23,904 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [557891205] [2020-08-19 03:42:23,904 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-19 03:42:23,905 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:23,905 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-19 03:42:23,905 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=467, Invalid=525, Unknown=0, NotChecked=0, Total=992 [2020-08-19 03:42:23,905 INFO L87 Difference]: Start difference. First operand 69 states and 69 transitions. Second operand 32 states. [2020-08-19 03:42:24,095 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:24,095 INFO L93 Difference]: Finished difference Result 78 states and 78 transitions. [2020-08-19 03:42:24,095 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-19 03:42:24,096 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 68 [2020-08-19 03:42:24,096 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:24,097 INFO L225 Difference]: With dead ends: 78 [2020-08-19 03:42:24,097 INFO L226 Difference]: Without dead ends: 72 [2020-08-19 03:42:24,098 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=467, Invalid=525, Unknown=0, NotChecked=0, Total=992 [2020-08-19 03:42:24,098 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-08-19 03:42:24,101 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 71. [2020-08-19 03:42:24,101 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-08-19 03:42:24,102 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 71 transitions. [2020-08-19 03:42:24,102 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 71 transitions. Word has length 68 [2020-08-19 03:42:24,102 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:24,102 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 71 transitions. [2020-08-19 03:42:24,102 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-19 03:42:24,102 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 71 transitions. [2020-08-19 03:42:24,103 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2020-08-19 03:42:24,103 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:24,103 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:24,103 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-19 03:42:24,103 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:24,104 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:24,104 INFO L82 PathProgramCache]: Analyzing trace with hash -102083977, now seen corresponding path program 29 times [2020-08-19 03:42:24,104 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:24,104 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [125388696] [2020-08-19 03:42:24,104 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:24,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:24,773 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:24,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:24,786 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:24,786 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [125388696] [2020-08-19 03:42:24,786 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:24,787 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-19 03:42:24,787 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1119144810] [2020-08-19 03:42:24,788 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-19 03:42:24,788 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:24,788 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-19 03:42:24,789 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=498, Invalid=558, Unknown=0, NotChecked=0, Total=1056 [2020-08-19 03:42:24,789 INFO L87 Difference]: Start difference. First operand 71 states and 71 transitions. Second operand 33 states. [2020-08-19 03:42:25,025 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:25,025 INFO L93 Difference]: Finished difference Result 80 states and 80 transitions. [2020-08-19 03:42:25,026 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-19 03:42:25,026 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 70 [2020-08-19 03:42:25,027 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:25,027 INFO L225 Difference]: With dead ends: 80 [2020-08-19 03:42:25,028 INFO L226 Difference]: Without dead ends: 74 [2020-08-19 03:42:25,029 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=498, Invalid=558, Unknown=0, NotChecked=0, Total=1056 [2020-08-19 03:42:25,029 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2020-08-19 03:42:25,032 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 73. [2020-08-19 03:42:25,033 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-08-19 03:42:25,033 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 73 transitions. [2020-08-19 03:42:25,033 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 73 transitions. Word has length 70 [2020-08-19 03:42:25,034 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:25,034 INFO L479 AbstractCegarLoop]: Abstraction has 73 states and 73 transitions. [2020-08-19 03:42:25,034 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-19 03:42:25,034 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 73 transitions. [2020-08-19 03:42:25,035 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2020-08-19 03:42:25,035 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:25,035 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:25,036 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-19 03:42:25,036 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:25,036 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:25,036 INFO L82 PathProgramCache]: Analyzing trace with hash -159175783, now seen corresponding path program 30 times [2020-08-19 03:42:25,037 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:25,037 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [583309174] [2020-08-19 03:42:25,037 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:25,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:25,784 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:25,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:25,792 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 03:42:25,792 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [583309174] [2020-08-19 03:42:25,792 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:25,792 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-19 03:42:25,793 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2091084640] [2020-08-19 03:42:25,793 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-19 03:42:25,793 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:25,794 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-19 03:42:25,794 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=530, Invalid=592, Unknown=0, NotChecked=0, Total=1122 [2020-08-19 03:42:25,794 INFO L87 Difference]: Start difference. First operand 73 states and 73 transitions. Second operand 34 states. [2020-08-19 03:42:25,969 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:25,969 INFO L93 Difference]: Finished difference Result 82 states and 82 transitions. [2020-08-19 03:42:25,969 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-19 03:42:25,969 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 72 [2020-08-19 03:42:25,970 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:25,970 INFO L225 Difference]: With dead ends: 82 [2020-08-19 03:42:25,970 INFO L226 Difference]: Without dead ends: 76 [2020-08-19 03:42:25,971 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=530, Invalid=592, Unknown=0, NotChecked=0, Total=1122 [2020-08-19 03:42:25,972 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-08-19 03:42:25,974 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 75. [2020-08-19 03:42:25,974 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2020-08-19 03:42:25,975 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 75 transitions. [2020-08-19 03:42:25,975 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 75 transitions. Word has length 72 [2020-08-19 03:42:25,975 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:25,976 INFO L479 AbstractCegarLoop]: Abstraction has 75 states and 75 transitions. [2020-08-19 03:42:25,976 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-19 03:42:25,976 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 75 transitions. [2020-08-19 03:42:25,976 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2020-08-19 03:42:25,976 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:25,977 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:25,977 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-19 03:42:25,977 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:25,977 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:25,977 INFO L82 PathProgramCache]: Analyzing trace with hash 810173499, now seen corresponding path program 31 times [2020-08-19 03:42:25,977 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:25,978 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1074097147] [2020-08-19 03:42:25,978 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:25,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:26,660 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:26,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:26,668 INFO L134 CoverageAnalysis]: Checked inductivity of 961 backedges. 0 proven. 961 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:26,669 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1074097147] [2020-08-19 03:42:26,669 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:26,669 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-19 03:42:26,669 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1307352529] [2020-08-19 03:42:26,670 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-19 03:42:26,670 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:26,670 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-19 03:42:26,671 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=563, Invalid=627, Unknown=0, NotChecked=0, Total=1190 [2020-08-19 03:42:26,671 INFO L87 Difference]: Start difference. First operand 75 states and 75 transitions. Second operand 35 states. [2020-08-19 03:42:26,854 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:26,854 INFO L93 Difference]: Finished difference Result 84 states and 84 transitions. [2020-08-19 03:42:26,854 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-19 03:42:26,855 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 74 [2020-08-19 03:42:26,855 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:26,856 INFO L225 Difference]: With dead ends: 84 [2020-08-19 03:42:26,856 INFO L226 Difference]: Without dead ends: 78 [2020-08-19 03:42:26,857 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=563, Invalid=627, Unknown=0, NotChecked=0, Total=1190 [2020-08-19 03:42:26,857 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-08-19 03:42:26,860 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 77. [2020-08-19 03:42:26,860 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2020-08-19 03:42:26,860 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 77 transitions. [2020-08-19 03:42:26,861 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 77 transitions. Word has length 74 [2020-08-19 03:42:26,861 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:26,861 INFO L479 AbstractCegarLoop]: Abstraction has 77 states and 77 transitions. [2020-08-19 03:42:26,861 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-19 03:42:26,861 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 77 transitions. [2020-08-19 03:42:26,862 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2020-08-19 03:42:26,862 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:26,862 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:26,862 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-19 03:42:26,863 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:26,863 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:26,863 INFO L82 PathProgramCache]: Analyzing trace with hash 346930269, now seen corresponding path program 32 times [2020-08-19 03:42:26,863 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:26,863 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1145949335] [2020-08-19 03:42:26,864 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:26,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:27,502 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:27,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:27,510 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:27,511 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1145949335] [2020-08-19 03:42:27,511 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:27,511 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-19 03:42:27,511 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [943497343] [2020-08-19 03:42:27,511 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-19 03:42:27,512 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:27,512 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-19 03:42:27,512 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=597, Invalid=663, Unknown=0, NotChecked=0, Total=1260 [2020-08-19 03:42:27,512 INFO L87 Difference]: Start difference. First operand 77 states and 77 transitions. Second operand 36 states. [2020-08-19 03:42:27,685 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:27,686 INFO L93 Difference]: Finished difference Result 86 states and 86 transitions. [2020-08-19 03:42:27,686 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-19 03:42:27,686 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 76 [2020-08-19 03:42:27,687 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:27,688 INFO L225 Difference]: With dead ends: 86 [2020-08-19 03:42:27,688 INFO L226 Difference]: Without dead ends: 80 [2020-08-19 03:42:27,691 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=597, Invalid=663, Unknown=0, NotChecked=0, Total=1260 [2020-08-19 03:42:27,691 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-08-19 03:42:27,694 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 79. [2020-08-19 03:42:27,694 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-08-19 03:42:27,695 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 79 transitions. [2020-08-19 03:42:27,695 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 79 transitions. Word has length 76 [2020-08-19 03:42:27,695 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:27,696 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 79 transitions. [2020-08-19 03:42:27,696 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-19 03:42:27,696 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 79 transitions. [2020-08-19 03:42:27,696 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-08-19 03:42:27,697 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:27,697 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:27,697 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-19 03:42:27,697 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:27,697 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:27,697 INFO L82 PathProgramCache]: Analyzing trace with hash 1846785023, now seen corresponding path program 33 times [2020-08-19 03:42:27,698 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:27,698 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [967689762] [2020-08-19 03:42:27,698 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:27,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:28,441 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:28,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:28,451 INFO L134 CoverageAnalysis]: Checked inductivity of 1089 backedges. 0 proven. 1089 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:28,459 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [967689762] [2020-08-19 03:42:28,459 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:28,459 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-19 03:42:28,460 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [626811974] [2020-08-19 03:42:28,460 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-19 03:42:28,461 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:28,461 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-19 03:42:28,462 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=632, Invalid=700, Unknown=0, NotChecked=0, Total=1332 [2020-08-19 03:42:28,462 INFO L87 Difference]: Start difference. First operand 79 states and 79 transitions. Second operand 37 states. [2020-08-19 03:42:28,670 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:28,671 INFO L93 Difference]: Finished difference Result 88 states and 88 transitions. [2020-08-19 03:42:28,671 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-19 03:42:28,671 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 78 [2020-08-19 03:42:28,672 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:28,672 INFO L225 Difference]: With dead ends: 88 [2020-08-19 03:42:28,672 INFO L226 Difference]: Without dead ends: 82 [2020-08-19 03:42:28,673 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=632, Invalid=700, Unknown=0, NotChecked=0, Total=1332 [2020-08-19 03:42:28,673 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-08-19 03:42:28,676 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 81. [2020-08-19 03:42:28,676 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2020-08-19 03:42:28,677 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 81 transitions. [2020-08-19 03:42:28,677 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 81 transitions. Word has length 78 [2020-08-19 03:42:28,677 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:28,677 INFO L479 AbstractCegarLoop]: Abstraction has 81 states and 81 transitions. [2020-08-19 03:42:28,678 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-19 03:42:28,678 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 81 transitions. [2020-08-19 03:42:28,678 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2020-08-19 03:42:28,679 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:28,679 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:28,679 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-19 03:42:28,679 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:28,680 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:28,680 INFO L82 PathProgramCache]: Analyzing trace with hash 98192161, now seen corresponding path program 34 times [2020-08-19 03:42:28,680 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:28,680 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2033000429] [2020-08-19 03:42:28,680 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:28,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:29,485 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:29,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:29,494 INFO L134 CoverageAnalysis]: Checked inductivity of 1156 backedges. 0 proven. 1156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:29,494 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2033000429] [2020-08-19 03:42:29,494 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:29,495 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-19 03:42:29,495 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1239489020] [2020-08-19 03:42:29,495 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-19 03:42:29,495 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:29,496 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-19 03:42:29,496 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=668, Invalid=738, Unknown=0, NotChecked=0, Total=1406 [2020-08-19 03:42:29,496 INFO L87 Difference]: Start difference. First operand 81 states and 81 transitions. Second operand 38 states. [2020-08-19 03:42:29,670 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:29,670 INFO L93 Difference]: Finished difference Result 90 states and 90 transitions. [2020-08-19 03:42:29,671 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-19 03:42:29,671 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 80 [2020-08-19 03:42:29,671 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:29,672 INFO L225 Difference]: With dead ends: 90 [2020-08-19 03:42:29,672 INFO L226 Difference]: Without dead ends: 84 [2020-08-19 03:42:29,673 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=668, Invalid=738, Unknown=0, NotChecked=0, Total=1406 [2020-08-19 03:42:29,673 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2020-08-19 03:42:29,676 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 83. [2020-08-19 03:42:29,676 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2020-08-19 03:42:29,676 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 83 transitions. [2020-08-19 03:42:29,677 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 83 transitions. Word has length 80 [2020-08-19 03:42:29,677 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:29,677 INFO L479 AbstractCegarLoop]: Abstraction has 83 states and 83 transitions. [2020-08-19 03:42:29,677 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-19 03:42:29,677 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 83 transitions. [2020-08-19 03:42:29,678 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2020-08-19 03:42:29,678 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:29,678 INFO L422 BasicCegarLoop]: trace histogram [35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:29,678 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-19 03:42:29,678 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:29,679 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:29,679 INFO L82 PathProgramCache]: Analyzing trace with hash -967335485, now seen corresponding path program 35 times [2020-08-19 03:42:29,679 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:29,679 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1500472050] [2020-08-19 03:42:29,679 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:29,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:30,613 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:30,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:30,623 INFO L134 CoverageAnalysis]: Checked inductivity of 1225 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:30,624 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1500472050] [2020-08-19 03:42:30,624 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:30,624 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-19 03:42:30,624 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2053951687] [2020-08-19 03:42:30,625 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-19 03:42:30,625 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:30,625 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-19 03:42:30,626 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=705, Invalid=777, Unknown=0, NotChecked=0, Total=1482 [2020-08-19 03:42:30,626 INFO L87 Difference]: Start difference. First operand 83 states and 83 transitions. Second operand 39 states. [2020-08-19 03:42:30,762 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:30,762 INFO L93 Difference]: Finished difference Result 92 states and 92 transitions. [2020-08-19 03:42:30,762 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-19 03:42:30,762 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 82 [2020-08-19 03:42:30,763 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:30,764 INFO L225 Difference]: With dead ends: 92 [2020-08-19 03:42:30,764 INFO L226 Difference]: Without dead ends: 86 [2020-08-19 03:42:30,765 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=705, Invalid=777, Unknown=0, NotChecked=0, Total=1482 [2020-08-19 03:42:30,766 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2020-08-19 03:42:30,769 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 85. [2020-08-19 03:42:30,769 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2020-08-19 03:42:30,770 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 85 transitions. [2020-08-19 03:42:30,770 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 85 transitions. Word has length 82 [2020-08-19 03:42:30,770 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:30,770 INFO L479 AbstractCegarLoop]: Abstraction has 85 states and 85 transitions. [2020-08-19 03:42:30,770 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-19 03:42:30,771 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 85 transitions. [2020-08-19 03:42:30,771 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2020-08-19 03:42:30,771 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:30,771 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:30,772 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-19 03:42:30,772 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:30,772 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:30,772 INFO L82 PathProgramCache]: Analyzing trace with hash 1557780453, now seen corresponding path program 36 times [2020-08-19 03:42:30,772 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:30,772 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [976468146] [2020-08-19 03:42:30,773 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:30,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:31,620 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:31,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:31,629 INFO L134 CoverageAnalysis]: Checked inductivity of 1296 backedges. 0 proven. 1296 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:31,629 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [976468146] [2020-08-19 03:42:31,629 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:31,629 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-19 03:42:31,630 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [571722951] [2020-08-19 03:42:31,630 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-19 03:42:31,630 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:31,631 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-19 03:42:31,631 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=743, Invalid=817, Unknown=0, NotChecked=0, Total=1560 [2020-08-19 03:42:31,631 INFO L87 Difference]: Start difference. First operand 85 states and 85 transitions. Second operand 40 states. [2020-08-19 03:42:31,877 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:31,877 INFO L93 Difference]: Finished difference Result 94 states and 94 transitions. [2020-08-19 03:42:31,877 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-19 03:42:31,878 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 84 [2020-08-19 03:42:31,878 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:31,879 INFO L225 Difference]: With dead ends: 94 [2020-08-19 03:42:31,879 INFO L226 Difference]: Without dead ends: 88 [2020-08-19 03:42:31,881 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=743, Invalid=817, Unknown=0, NotChecked=0, Total=1560 [2020-08-19 03:42:31,881 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-08-19 03:42:31,884 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 87. [2020-08-19 03:42:31,884 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2020-08-19 03:42:31,884 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 87 transitions. [2020-08-19 03:42:31,885 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 87 transitions. Word has length 84 [2020-08-19 03:42:31,885 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:31,885 INFO L479 AbstractCegarLoop]: Abstraction has 87 states and 87 transitions. [2020-08-19 03:42:31,885 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-19 03:42:31,885 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 87 transitions. [2020-08-19 03:42:31,886 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2020-08-19 03:42:31,886 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:31,886 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:31,886 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-19 03:42:31,886 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:31,887 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:31,887 INFO L82 PathProgramCache]: Analyzing trace with hash 1537674631, now seen corresponding path program 37 times [2020-08-19 03:42:31,887 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:31,887 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1348474583] [2020-08-19 03:42:31,887 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:31,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:32,756 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:32,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:32,766 INFO L134 CoverageAnalysis]: Checked inductivity of 1369 backedges. 0 proven. 1369 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:32,766 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1348474583] [2020-08-19 03:42:32,766 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:32,767 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-19 03:42:32,767 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [865408246] [2020-08-19 03:42:32,767 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-19 03:42:32,767 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:32,768 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-19 03:42:32,768 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=782, Invalid=858, Unknown=0, NotChecked=0, Total=1640 [2020-08-19 03:42:32,768 INFO L87 Difference]: Start difference. First operand 87 states and 87 transitions. Second operand 41 states. [2020-08-19 03:42:33,013 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:33,013 INFO L93 Difference]: Finished difference Result 96 states and 96 transitions. [2020-08-19 03:42:33,014 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-19 03:42:33,014 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 86 [2020-08-19 03:42:33,014 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:33,015 INFO L225 Difference]: With dead ends: 96 [2020-08-19 03:42:33,015 INFO L226 Difference]: Without dead ends: 90 [2020-08-19 03:42:33,018 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=782, Invalid=858, Unknown=0, NotChecked=0, Total=1640 [2020-08-19 03:42:33,018 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2020-08-19 03:42:33,021 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 89. [2020-08-19 03:42:33,021 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2020-08-19 03:42:33,022 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 89 transitions. [2020-08-19 03:42:33,023 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 89 transitions. Word has length 86 [2020-08-19 03:42:33,023 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:33,023 INFO L479 AbstractCegarLoop]: Abstraction has 89 states and 89 transitions. [2020-08-19 03:42:33,023 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-19 03:42:33,023 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 89 transitions. [2020-08-19 03:42:33,024 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2020-08-19 03:42:33,024 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:33,024 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:33,024 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-19 03:42:33,025 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:33,025 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:33,025 INFO L82 PathProgramCache]: Analyzing trace with hash -604151127, now seen corresponding path program 38 times [2020-08-19 03:42:33,025 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:33,025 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1814168012] [2020-08-19 03:42:33,025 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:33,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:33,946 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:33,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:33,954 INFO L134 CoverageAnalysis]: Checked inductivity of 1444 backedges. 0 proven. 1444 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:33,954 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1814168012] [2020-08-19 03:42:33,955 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:33,955 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-19 03:42:33,955 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2055838313] [2020-08-19 03:42:33,955 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-19 03:42:33,955 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:33,955 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-19 03:42:33,956 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=822, Invalid=900, Unknown=0, NotChecked=0, Total=1722 [2020-08-19 03:42:33,956 INFO L87 Difference]: Start difference. First operand 89 states and 89 transitions. Second operand 42 states. [2020-08-19 03:42:34,198 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:34,198 INFO L93 Difference]: Finished difference Result 98 states and 98 transitions. [2020-08-19 03:42:34,199 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-19 03:42:34,199 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 88 [2020-08-19 03:42:34,199 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:34,200 INFO L225 Difference]: With dead ends: 98 [2020-08-19 03:42:34,200 INFO L226 Difference]: Without dead ends: 92 [2020-08-19 03:42:34,201 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=822, Invalid=900, Unknown=0, NotChecked=0, Total=1722 [2020-08-19 03:42:34,202 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2020-08-19 03:42:34,205 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 91. [2020-08-19 03:42:34,205 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2020-08-19 03:42:34,206 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 91 transitions. [2020-08-19 03:42:34,206 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 91 transitions. Word has length 88 [2020-08-19 03:42:34,206 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:34,207 INFO L479 AbstractCegarLoop]: Abstraction has 91 states and 91 transitions. [2020-08-19 03:42:34,207 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-19 03:42:34,207 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 91 transitions. [2020-08-19 03:42:34,207 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2020-08-19 03:42:34,207 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:34,208 INFO L422 BasicCegarLoop]: trace histogram [39, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:34,208 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-19 03:42:34,208 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:34,208 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:34,208 INFO L82 PathProgramCache]: Analyzing trace with hash -1609369781, now seen corresponding path program 39 times [2020-08-19 03:42:34,208 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:34,209 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2019918176] [2020-08-19 03:42:34,209 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:34,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:35,120 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:35,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:35,133 INFO L134 CoverageAnalysis]: Checked inductivity of 1521 backedges. 0 proven. 1521 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:35,133 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2019918176] [2020-08-19 03:42:35,134 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:35,134 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-19 03:42:35,134 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1616397975] [2020-08-19 03:42:35,137 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-19 03:42:35,137 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:35,137 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-19 03:42:35,138 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=863, Invalid=943, Unknown=0, NotChecked=0, Total=1806 [2020-08-19 03:42:35,138 INFO L87 Difference]: Start difference. First operand 91 states and 91 transitions. Second operand 43 states. [2020-08-19 03:42:35,370 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:35,370 INFO L93 Difference]: Finished difference Result 100 states and 100 transitions. [2020-08-19 03:42:35,370 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-08-19 03:42:35,371 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 90 [2020-08-19 03:42:35,371 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:35,372 INFO L225 Difference]: With dead ends: 100 [2020-08-19 03:42:35,372 INFO L226 Difference]: Without dead ends: 94 [2020-08-19 03:42:35,373 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=863, Invalid=943, Unknown=0, NotChecked=0, Total=1806 [2020-08-19 03:42:35,374 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2020-08-19 03:42:35,378 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 93. [2020-08-19 03:42:35,384 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2020-08-19 03:42:35,384 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 93 transitions. [2020-08-19 03:42:35,385 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 93 transitions. Word has length 90 [2020-08-19 03:42:35,385 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:35,385 INFO L479 AbstractCegarLoop]: Abstraction has 93 states and 93 transitions. [2020-08-19 03:42:35,385 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-19 03:42:35,385 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 93 transitions. [2020-08-19 03:42:35,386 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2020-08-19 03:42:35,386 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:35,386 INFO L422 BasicCegarLoop]: trace histogram [40, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:35,386 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-19 03:42:35,386 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:35,386 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:35,386 INFO L82 PathProgramCache]: Analyzing trace with hash -1256854675, now seen corresponding path program 40 times [2020-08-19 03:42:35,387 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:35,387 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [707076917] [2020-08-19 03:42:35,387 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:35,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:36,402 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:36,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:36,410 INFO L134 CoverageAnalysis]: Checked inductivity of 1600 backedges. 0 proven. 1600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:36,411 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [707076917] [2020-08-19 03:42:36,411 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:36,411 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44] total 44 [2020-08-19 03:42:36,411 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [874996684] [2020-08-19 03:42:36,411 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-08-19 03:42:36,411 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:36,412 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-08-19 03:42:36,412 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=905, Invalid=987, Unknown=0, NotChecked=0, Total=1892 [2020-08-19 03:42:36,412 INFO L87 Difference]: Start difference. First operand 93 states and 93 transitions. Second operand 44 states. [2020-08-19 03:42:36,600 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:36,600 INFO L93 Difference]: Finished difference Result 102 states and 102 transitions. [2020-08-19 03:42:36,601 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-08-19 03:42:36,601 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 92 [2020-08-19 03:42:36,601 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:36,602 INFO L225 Difference]: With dead ends: 102 [2020-08-19 03:42:36,603 INFO L226 Difference]: Without dead ends: 96 [2020-08-19 03:42:36,604 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=905, Invalid=987, Unknown=0, NotChecked=0, Total=1892 [2020-08-19 03:42:36,606 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2020-08-19 03:42:36,609 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 95. [2020-08-19 03:42:36,609 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2020-08-19 03:42:36,612 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 95 transitions. [2020-08-19 03:42:36,612 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 95 transitions. Word has length 92 [2020-08-19 03:42:36,612 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:36,612 INFO L479 AbstractCegarLoop]: Abstraction has 95 states and 95 transitions. [2020-08-19 03:42:36,613 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-08-19 03:42:36,613 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 95 transitions. [2020-08-19 03:42:36,613 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2020-08-19 03:42:36,613 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:36,614 INFO L422 BasicCegarLoop]: trace histogram [41, 41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:36,614 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-08-19 03:42:36,614 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:36,614 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:36,615 INFO L82 PathProgramCache]: Analyzing trace with hash -1792254193, now seen corresponding path program 41 times [2020-08-19 03:42:36,615 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:36,615 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [845249540] [2020-08-19 03:42:36,615 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:36,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:37,627 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:37,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:37,638 INFO L134 CoverageAnalysis]: Checked inductivity of 1681 backedges. 0 proven. 1681 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:37,638 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [845249540] [2020-08-19 03:42:37,638 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:37,638 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45] total 45 [2020-08-19 03:42:37,639 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1864433766] [2020-08-19 03:42:37,639 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2020-08-19 03:42:37,639 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:37,639 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2020-08-19 03:42:37,640 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=948, Invalid=1032, Unknown=0, NotChecked=0, Total=1980 [2020-08-19 03:42:37,640 INFO L87 Difference]: Start difference. First operand 95 states and 95 transitions. Second operand 45 states. [2020-08-19 03:42:37,888 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:37,888 INFO L93 Difference]: Finished difference Result 104 states and 104 transitions. [2020-08-19 03:42:37,889 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2020-08-19 03:42:37,889 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 94 [2020-08-19 03:42:37,889 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:37,890 INFO L225 Difference]: With dead ends: 104 [2020-08-19 03:42:37,890 INFO L226 Difference]: Without dead ends: 98 [2020-08-19 03:42:37,892 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=948, Invalid=1032, Unknown=0, NotChecked=0, Total=1980 [2020-08-19 03:42:37,892 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-08-19 03:42:37,896 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 97. [2020-08-19 03:42:37,896 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2020-08-19 03:42:37,896 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 97 transitions. [2020-08-19 03:42:37,897 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 97 transitions. Word has length 94 [2020-08-19 03:42:37,897 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:37,897 INFO L479 AbstractCegarLoop]: Abstraction has 97 states and 97 transitions. [2020-08-19 03:42:37,897 INFO L480 AbstractCegarLoop]: Interpolant automaton has 45 states. [2020-08-19 03:42:37,897 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 97 transitions. [2020-08-19 03:42:37,898 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-08-19 03:42:37,898 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:37,898 INFO L422 BasicCegarLoop]: trace histogram [42, 42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:37,898 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2020-08-19 03:42:37,898 INFO L427 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:37,899 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:37,899 INFO L82 PathProgramCache]: Analyzing trace with hash -915115471, now seen corresponding path program 42 times [2020-08-19 03:42:37,899 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:37,899 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [937476682] [2020-08-19 03:42:37,899 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:37,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:38,987 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:38,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:38,998 INFO L134 CoverageAnalysis]: Checked inductivity of 1764 backedges. 0 proven. 1764 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:38,999 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [937476682] [2020-08-19 03:42:38,999 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:38,999 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46] total 46 [2020-08-19 03:42:38,999 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1539066233] [2020-08-19 03:42:38,999 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2020-08-19 03:42:38,999 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:39,000 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2020-08-19 03:42:39,000 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=992, Invalid=1078, Unknown=0, NotChecked=0, Total=2070 [2020-08-19 03:42:39,001 INFO L87 Difference]: Start difference. First operand 97 states and 97 transitions. Second operand 46 states. [2020-08-19 03:42:39,196 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:39,196 INFO L93 Difference]: Finished difference Result 106 states and 106 transitions. [2020-08-19 03:42:39,196 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2020-08-19 03:42:39,196 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 96 [2020-08-19 03:42:39,197 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:39,198 INFO L225 Difference]: With dead ends: 106 [2020-08-19 03:42:39,198 INFO L226 Difference]: Without dead ends: 100 [2020-08-19 03:42:39,199 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=992, Invalid=1078, Unknown=0, NotChecked=0, Total=2070 [2020-08-19 03:42:39,199 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2020-08-19 03:42:39,202 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 99. [2020-08-19 03:42:39,202 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2020-08-19 03:42:39,202 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 99 transitions. [2020-08-19 03:42:39,202 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 99 transitions. Word has length 96 [2020-08-19 03:42:39,203 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:39,203 INFO L479 AbstractCegarLoop]: Abstraction has 99 states and 99 transitions. [2020-08-19 03:42:39,203 INFO L480 AbstractCegarLoop]: Interpolant automaton has 46 states. [2020-08-19 03:42:39,203 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 99 transitions. [2020-08-19 03:42:39,203 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2020-08-19 03:42:39,203 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:39,204 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:39,204 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2020-08-19 03:42:39,204 INFO L427 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:39,204 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:39,204 INFO L82 PathProgramCache]: Analyzing trace with hash 201606355, now seen corresponding path program 43 times [2020-08-19 03:42:39,204 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:39,204 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [474545395] [2020-08-19 03:42:39,205 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:39,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:40,358 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:40,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:40,369 INFO L134 CoverageAnalysis]: Checked inductivity of 1849 backedges. 0 proven. 1849 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:40,369 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [474545395] [2020-08-19 03:42:40,369 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:40,369 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47] total 47 [2020-08-19 03:42:40,369 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1343770598] [2020-08-19 03:42:40,370 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2020-08-19 03:42:40,370 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:40,370 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2020-08-19 03:42:40,370 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1037, Invalid=1125, Unknown=0, NotChecked=0, Total=2162 [2020-08-19 03:42:40,371 INFO L87 Difference]: Start difference. First operand 99 states and 99 transitions. Second operand 47 states. [2020-08-19 03:42:40,640 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:40,640 INFO L93 Difference]: Finished difference Result 108 states and 108 transitions. [2020-08-19 03:42:40,640 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2020-08-19 03:42:40,641 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 98 [2020-08-19 03:42:40,641 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:40,642 INFO L225 Difference]: With dead ends: 108 [2020-08-19 03:42:40,642 INFO L226 Difference]: Without dead ends: 102 [2020-08-19 03:42:40,643 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1037, Invalid=1125, Unknown=0, NotChecked=0, Total=2162 [2020-08-19 03:42:40,643 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2020-08-19 03:42:40,646 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 101. [2020-08-19 03:42:40,646 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2020-08-19 03:42:40,647 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 101 transitions. [2020-08-19 03:42:40,647 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 101 transitions. Word has length 98 [2020-08-19 03:42:40,647 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:40,648 INFO L479 AbstractCegarLoop]: Abstraction has 101 states and 101 transitions. [2020-08-19 03:42:40,648 INFO L480 AbstractCegarLoop]: Interpolant automaton has 47 states. [2020-08-19 03:42:40,648 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 101 transitions. [2020-08-19 03:42:40,648 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2020-08-19 03:42:40,648 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:40,649 INFO L422 BasicCegarLoop]: trace histogram [44, 44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:40,649 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2020-08-19 03:42:40,649 INFO L427 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:40,649 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:40,649 INFO L82 PathProgramCache]: Analyzing trace with hash -370542859, now seen corresponding path program 44 times [2020-08-19 03:42:40,649 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:40,650 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [320177104] [2020-08-19 03:42:40,650 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:40,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:42,054 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:42,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:42,079 INFO L134 CoverageAnalysis]: Checked inductivity of 1936 backedges. 0 proven. 1936 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:42,080 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [320177104] [2020-08-19 03:42:42,080 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:42,081 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48] total 48 [2020-08-19 03:42:42,081 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [630541996] [2020-08-19 03:42:42,082 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-08-19 03:42:42,082 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:42,083 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-08-19 03:42:42,083 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1083, Invalid=1173, Unknown=0, NotChecked=0, Total=2256 [2020-08-19 03:42:42,084 INFO L87 Difference]: Start difference. First operand 101 states and 101 transitions. Second operand 48 states. [2020-08-19 03:42:42,379 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:42,379 INFO L93 Difference]: Finished difference Result 110 states and 110 transitions. [2020-08-19 03:42:42,380 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-08-19 03:42:42,380 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 100 [2020-08-19 03:42:42,381 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:42,382 INFO L225 Difference]: With dead ends: 110 [2020-08-19 03:42:42,382 INFO L226 Difference]: Without dead ends: 104 [2020-08-19 03:42:42,383 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1083, Invalid=1173, Unknown=0, NotChecked=0, Total=2256 [2020-08-19 03:42:42,383 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2020-08-19 03:42:42,387 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 103. [2020-08-19 03:42:42,387 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2020-08-19 03:42:42,388 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 103 transitions. [2020-08-19 03:42:42,388 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 103 transitions. Word has length 100 [2020-08-19 03:42:42,388 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:42,388 INFO L479 AbstractCegarLoop]: Abstraction has 103 states and 103 transitions. [2020-08-19 03:42:42,388 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-08-19 03:42:42,389 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 103 transitions. [2020-08-19 03:42:42,389 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2020-08-19 03:42:42,389 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:42,389 INFO L422 BasicCegarLoop]: trace histogram [45, 45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:42,390 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2020-08-19 03:42:42,390 INFO L427 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:42,390 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:42,390 INFO L82 PathProgramCache]: Analyzing trace with hash -450123625, now seen corresponding path program 45 times [2020-08-19 03:42:42,390 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:42,391 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [849665565] [2020-08-19 03:42:42,391 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:42,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:43,721 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:43,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:43,732 INFO L134 CoverageAnalysis]: Checked inductivity of 2025 backedges. 0 proven. 2025 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:43,732 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [849665565] [2020-08-19 03:42:43,732 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:43,732 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49] total 49 [2020-08-19 03:42:43,733 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1745848844] [2020-08-19 03:42:43,733 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2020-08-19 03:42:43,733 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:43,733 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2020-08-19 03:42:43,734 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1130, Invalid=1222, Unknown=0, NotChecked=0, Total=2352 [2020-08-19 03:42:43,734 INFO L87 Difference]: Start difference. First operand 103 states and 103 transitions. Second operand 49 states. [2020-08-19 03:42:43,913 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:43,913 INFO L93 Difference]: Finished difference Result 112 states and 112 transitions. [2020-08-19 03:42:43,913 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2020-08-19 03:42:43,914 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 102 [2020-08-19 03:42:43,914 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:43,915 INFO L225 Difference]: With dead ends: 112 [2020-08-19 03:42:43,915 INFO L226 Difference]: Without dead ends: 106 [2020-08-19 03:42:43,915 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1130, Invalid=1222, Unknown=0, NotChecked=0, Total=2352 [2020-08-19 03:42:43,916 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2020-08-19 03:42:43,919 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 105. [2020-08-19 03:42:43,919 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2020-08-19 03:42:43,920 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 105 transitions. [2020-08-19 03:42:43,920 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 105 transitions. Word has length 102 [2020-08-19 03:42:43,920 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:43,920 INFO L479 AbstractCegarLoop]: Abstraction has 105 states and 105 transitions. [2020-08-19 03:42:43,920 INFO L480 AbstractCegarLoop]: Interpolant automaton has 49 states. [2020-08-19 03:42:43,921 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 105 transitions. [2020-08-19 03:42:43,921 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2020-08-19 03:42:43,921 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:43,921 INFO L422 BasicCegarLoop]: trace histogram [46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:43,921 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2020-08-19 03:42:43,922 INFO L427 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:43,922 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:43,922 INFO L82 PathProgramCache]: Analyzing trace with hash 382171577, now seen corresponding path program 46 times [2020-08-19 03:42:43,922 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:43,922 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1530063484] [2020-08-19 03:42:43,922 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:43,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:45,170 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:45,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:45,181 INFO L134 CoverageAnalysis]: Checked inductivity of 2116 backedges. 0 proven. 2116 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:45,182 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1530063484] [2020-08-19 03:42:45,182 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:45,182 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50] total 50 [2020-08-19 03:42:45,182 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1377356834] [2020-08-19 03:42:45,182 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-08-19 03:42:45,183 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:45,183 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-08-19 03:42:45,183 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1178, Invalid=1272, Unknown=0, NotChecked=0, Total=2450 [2020-08-19 03:42:45,184 INFO L87 Difference]: Start difference. First operand 105 states and 105 transitions. Second operand 50 states. [2020-08-19 03:42:45,353 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:45,353 INFO L93 Difference]: Finished difference Result 114 states and 114 transitions. [2020-08-19 03:42:45,354 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2020-08-19 03:42:45,354 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 104 [2020-08-19 03:42:45,354 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:45,355 INFO L225 Difference]: With dead ends: 114 [2020-08-19 03:42:45,355 INFO L226 Difference]: Without dead ends: 108 [2020-08-19 03:42:45,356 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1178, Invalid=1272, Unknown=0, NotChecked=0, Total=2450 [2020-08-19 03:42:45,357 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-08-19 03:42:45,360 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 107. [2020-08-19 03:42:45,360 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2020-08-19 03:42:45,361 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 107 transitions. [2020-08-19 03:42:45,361 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 107 transitions. Word has length 104 [2020-08-19 03:42:45,361 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:45,361 INFO L479 AbstractCegarLoop]: Abstraction has 107 states and 107 transitions. [2020-08-19 03:42:45,361 INFO L480 AbstractCegarLoop]: Interpolant automaton has 50 states. [2020-08-19 03:42:45,361 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 107 transitions. [2020-08-19 03:42:45,362 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2020-08-19 03:42:45,362 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:45,362 INFO L422 BasicCegarLoop]: trace histogram [47, 47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:45,362 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47 [2020-08-19 03:42:45,363 INFO L427 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:45,363 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:45,363 INFO L82 PathProgramCache]: Analyzing trace with hash 1353943643, now seen corresponding path program 47 times [2020-08-19 03:42:45,363 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:45,363 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2004062099] [2020-08-19 03:42:45,363 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:45,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:46,686 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:46,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:46,697 INFO L134 CoverageAnalysis]: Checked inductivity of 2209 backedges. 0 proven. 2209 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:46,697 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2004062099] [2020-08-19 03:42:46,697 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:46,697 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51] total 51 [2020-08-19 03:42:46,697 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [528971758] [2020-08-19 03:42:46,698 INFO L459 AbstractCegarLoop]: Interpolant automaton has 51 states [2020-08-19 03:42:46,698 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:46,698 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2020-08-19 03:42:46,698 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1227, Invalid=1323, Unknown=0, NotChecked=0, Total=2550 [2020-08-19 03:42:46,698 INFO L87 Difference]: Start difference. First operand 107 states and 107 transitions. Second operand 51 states. [2020-08-19 03:42:46,908 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:46,908 INFO L93 Difference]: Finished difference Result 116 states and 116 transitions. [2020-08-19 03:42:46,909 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2020-08-19 03:42:46,909 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 106 [2020-08-19 03:42:46,909 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:46,910 INFO L225 Difference]: With dead ends: 116 [2020-08-19 03:42:46,910 INFO L226 Difference]: Without dead ends: 110 [2020-08-19 03:42:46,911 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 47 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1227, Invalid=1323, Unknown=0, NotChecked=0, Total=2550 [2020-08-19 03:42:46,911 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2020-08-19 03:42:46,914 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 109. [2020-08-19 03:42:46,914 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 109 states. [2020-08-19 03:42:46,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 109 transitions. [2020-08-19 03:42:46,915 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 109 transitions. Word has length 106 [2020-08-19 03:42:46,915 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:46,915 INFO L479 AbstractCegarLoop]: Abstraction has 109 states and 109 transitions. [2020-08-19 03:42:46,915 INFO L480 AbstractCegarLoop]: Interpolant automaton has 51 states. [2020-08-19 03:42:46,915 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 109 transitions. [2020-08-19 03:42:46,916 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2020-08-19 03:42:46,916 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:46,916 INFO L422 BasicCegarLoop]: trace histogram [48, 48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:46,916 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable48 [2020-08-19 03:42:46,917 INFO L427 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:46,917 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:46,917 INFO L82 PathProgramCache]: Analyzing trace with hash -1075971459, now seen corresponding path program 48 times [2020-08-19 03:42:46,917 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:46,917 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1756776247] [2020-08-19 03:42:46,917 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:46,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:48,280 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:48,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:48,292 INFO L134 CoverageAnalysis]: Checked inductivity of 2304 backedges. 0 proven. 2304 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:48,293 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1756776247] [2020-08-19 03:42:48,293 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:48,293 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52] total 52 [2020-08-19 03:42:48,293 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1807226857] [2020-08-19 03:42:48,293 INFO L459 AbstractCegarLoop]: Interpolant automaton has 52 states [2020-08-19 03:42:48,293 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:48,294 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2020-08-19 03:42:48,294 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1277, Invalid=1375, Unknown=0, NotChecked=0, Total=2652 [2020-08-19 03:42:48,294 INFO L87 Difference]: Start difference. First operand 109 states and 109 transitions. Second operand 52 states. [2020-08-19 03:42:48,496 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:48,496 INFO L93 Difference]: Finished difference Result 118 states and 118 transitions. [2020-08-19 03:42:48,497 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2020-08-19 03:42:48,497 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 108 [2020-08-19 03:42:48,497 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:48,498 INFO L225 Difference]: With dead ends: 118 [2020-08-19 03:42:48,498 INFO L226 Difference]: Without dead ends: 112 [2020-08-19 03:42:48,499 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1277, Invalid=1375, Unknown=0, NotChecked=0, Total=2652 [2020-08-19 03:42:48,499 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2020-08-19 03:42:48,503 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 111. [2020-08-19 03:42:48,503 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 111 states. [2020-08-19 03:42:48,503 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 111 transitions. [2020-08-19 03:42:48,504 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 111 transitions. Word has length 108 [2020-08-19 03:42:48,504 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:48,504 INFO L479 AbstractCegarLoop]: Abstraction has 111 states and 111 transitions. [2020-08-19 03:42:48,504 INFO L480 AbstractCegarLoop]: Interpolant automaton has 52 states. [2020-08-19 03:42:48,504 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 111 transitions. [2020-08-19 03:42:48,505 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2020-08-19 03:42:48,505 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:48,505 INFO L422 BasicCegarLoop]: trace histogram [49, 49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:48,505 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable49 [2020-08-19 03:42:48,505 INFO L427 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:48,505 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:48,506 INFO L82 PathProgramCache]: Analyzing trace with hash 237824543, now seen corresponding path program 49 times [2020-08-19 03:42:48,506 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:48,506 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1337005251] [2020-08-19 03:42:48,506 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:48,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:49,950 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:49,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:49,964 INFO L134 CoverageAnalysis]: Checked inductivity of 2401 backedges. 0 proven. 2401 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:49,964 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1337005251] [2020-08-19 03:42:49,964 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:49,965 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53] total 53 [2020-08-19 03:42:49,965 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [88984385] [2020-08-19 03:42:49,965 INFO L459 AbstractCegarLoop]: Interpolant automaton has 53 states [2020-08-19 03:42:49,965 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:49,966 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2020-08-19 03:42:49,966 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1328, Invalid=1428, Unknown=0, NotChecked=0, Total=2756 [2020-08-19 03:42:49,966 INFO L87 Difference]: Start difference. First operand 111 states and 111 transitions. Second operand 53 states. [2020-08-19 03:42:50,207 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:50,207 INFO L93 Difference]: Finished difference Result 120 states and 120 transitions. [2020-08-19 03:42:50,208 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2020-08-19 03:42:50,208 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 110 [2020-08-19 03:42:50,209 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:50,210 INFO L225 Difference]: With dead ends: 120 [2020-08-19 03:42:50,210 INFO L226 Difference]: Without dead ends: 114 [2020-08-19 03:42:50,211 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1328, Invalid=1428, Unknown=0, NotChecked=0, Total=2756 [2020-08-19 03:42:50,211 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2020-08-19 03:42:50,214 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 113. [2020-08-19 03:42:50,214 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 113 states. [2020-08-19 03:42:50,215 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 113 transitions. [2020-08-19 03:42:50,215 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 113 transitions. Word has length 110 [2020-08-19 03:42:50,215 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:50,215 INFO L479 AbstractCegarLoop]: Abstraction has 113 states and 113 transitions. [2020-08-19 03:42:50,216 INFO L480 AbstractCegarLoop]: Interpolant automaton has 53 states. [2020-08-19 03:42:50,216 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 113 transitions. [2020-08-19 03:42:50,216 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2020-08-19 03:42:50,216 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:50,217 INFO L422 BasicCegarLoop]: trace histogram [50, 50, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:50,217 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50 [2020-08-19 03:42:50,217 INFO L427 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:50,217 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:50,217 INFO L82 PathProgramCache]: Analyzing trace with hash 75397441, now seen corresponding path program 50 times [2020-08-19 03:42:50,217 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:50,218 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [703910775] [2020-08-19 03:42:50,218 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:50,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:51,702 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:51,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:51,717 INFO L134 CoverageAnalysis]: Checked inductivity of 2500 backedges. 0 proven. 2500 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:51,717 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [703910775] [2020-08-19 03:42:51,718 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:51,718 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54] total 54 [2020-08-19 03:42:51,718 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2073635087] [2020-08-19 03:42:51,718 INFO L459 AbstractCegarLoop]: Interpolant automaton has 54 states [2020-08-19 03:42:51,719 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:51,719 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2020-08-19 03:42:51,719 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1380, Invalid=1482, Unknown=0, NotChecked=0, Total=2862 [2020-08-19 03:42:51,720 INFO L87 Difference]: Start difference. First operand 113 states and 113 transitions. Second operand 54 states. [2020-08-19 03:42:52,034 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:52,034 INFO L93 Difference]: Finished difference Result 122 states and 122 transitions. [2020-08-19 03:42:52,035 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2020-08-19 03:42:52,035 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 112 [2020-08-19 03:42:52,035 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:52,036 INFO L225 Difference]: With dead ends: 122 [2020-08-19 03:42:52,036 INFO L226 Difference]: Without dead ends: 116 [2020-08-19 03:42:52,037 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 50 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1380, Invalid=1482, Unknown=0, NotChecked=0, Total=2862 [2020-08-19 03:42:52,037 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2020-08-19 03:42:52,040 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 115. [2020-08-19 03:42:52,040 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2020-08-19 03:42:52,041 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 115 transitions. [2020-08-19 03:42:52,041 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 115 transitions. Word has length 112 [2020-08-19 03:42:52,041 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:52,041 INFO L479 AbstractCegarLoop]: Abstraction has 115 states and 115 transitions. [2020-08-19 03:42:52,041 INFO L480 AbstractCegarLoop]: Interpolant automaton has 54 states. [2020-08-19 03:42:52,041 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 115 transitions. [2020-08-19 03:42:52,042 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2020-08-19 03:42:52,042 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:52,042 INFO L422 BasicCegarLoop]: trace histogram [51, 51, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:52,042 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51 [2020-08-19 03:42:52,043 INFO L427 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:52,043 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:52,043 INFO L82 PathProgramCache]: Analyzing trace with hash -1398224925, now seen corresponding path program 51 times [2020-08-19 03:42:52,043 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:52,043 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1748726947] [2020-08-19 03:42:52,044 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:52,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:53,584 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:53,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:53,597 INFO L134 CoverageAnalysis]: Checked inductivity of 2601 backedges. 0 proven. 2601 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:53,597 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1748726947] [2020-08-19 03:42:53,597 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:53,597 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [55] total 55 [2020-08-19 03:42:53,597 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1243938164] [2020-08-19 03:42:53,598 INFO L459 AbstractCegarLoop]: Interpolant automaton has 55 states [2020-08-19 03:42:53,598 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:53,598 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2020-08-19 03:42:53,599 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1433, Invalid=1537, Unknown=0, NotChecked=0, Total=2970 [2020-08-19 03:42:53,599 INFO L87 Difference]: Start difference. First operand 115 states and 115 transitions. Second operand 55 states. [2020-08-19 03:42:53,932 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:53,932 INFO L93 Difference]: Finished difference Result 124 states and 124 transitions. [2020-08-19 03:42:53,933 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2020-08-19 03:42:53,933 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 114 [2020-08-19 03:42:53,933 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:53,934 INFO L225 Difference]: With dead ends: 124 [2020-08-19 03:42:53,934 INFO L226 Difference]: Without dead ends: 118 [2020-08-19 03:42:53,935 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1433, Invalid=1537, Unknown=0, NotChecked=0, Total=2970 [2020-08-19 03:42:53,937 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2020-08-19 03:42:53,940 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 117. [2020-08-19 03:42:53,940 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 117 states. [2020-08-19 03:42:53,941 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 117 transitions. [2020-08-19 03:42:53,941 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 117 transitions. Word has length 114 [2020-08-19 03:42:53,942 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:53,942 INFO L479 AbstractCegarLoop]: Abstraction has 117 states and 117 transitions. [2020-08-19 03:42:53,942 INFO L480 AbstractCegarLoop]: Interpolant automaton has 55 states. [2020-08-19 03:42:53,942 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 117 transitions. [2020-08-19 03:42:53,943 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2020-08-19 03:42:53,943 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:53,943 INFO L422 BasicCegarLoop]: trace histogram [52, 52, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:53,943 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52 [2020-08-19 03:42:53,943 INFO L427 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:53,943 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:53,944 INFO L82 PathProgramCache]: Analyzing trace with hash -210110971, now seen corresponding path program 52 times [2020-08-19 03:42:53,944 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:53,944 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1804895759] [2020-08-19 03:42:53,944 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:53,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:55,546 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:55,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:55,558 INFO L134 CoverageAnalysis]: Checked inductivity of 2704 backedges. 0 proven. 2704 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:55,558 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1804895759] [2020-08-19 03:42:55,558 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:55,558 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56] total 56 [2020-08-19 03:42:55,559 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [570238181] [2020-08-19 03:42:55,559 INFO L459 AbstractCegarLoop]: Interpolant automaton has 56 states [2020-08-19 03:42:55,559 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:55,559 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2020-08-19 03:42:55,560 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1487, Invalid=1593, Unknown=0, NotChecked=0, Total=3080 [2020-08-19 03:42:55,560 INFO L87 Difference]: Start difference. First operand 117 states and 117 transitions. Second operand 56 states. [2020-08-19 03:42:55,887 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:55,888 INFO L93 Difference]: Finished difference Result 126 states and 126 transitions. [2020-08-19 03:42:55,888 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2020-08-19 03:42:55,888 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 116 [2020-08-19 03:42:55,889 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:55,890 INFO L225 Difference]: With dead ends: 126 [2020-08-19 03:42:55,890 INFO L226 Difference]: Without dead ends: 120 [2020-08-19 03:42:55,891 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1487, Invalid=1593, Unknown=0, NotChecked=0, Total=3080 [2020-08-19 03:42:55,891 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2020-08-19 03:42:55,894 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 119. [2020-08-19 03:42:55,894 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 119 states. [2020-08-19 03:42:55,895 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 119 transitions. [2020-08-19 03:42:55,895 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 119 transitions. Word has length 116 [2020-08-19 03:42:55,895 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:55,895 INFO L479 AbstractCegarLoop]: Abstraction has 119 states and 119 transitions. [2020-08-19 03:42:55,895 INFO L480 AbstractCegarLoop]: Interpolant automaton has 56 states. [2020-08-19 03:42:55,896 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 119 transitions. [2020-08-19 03:42:55,896 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2020-08-19 03:42:55,896 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:55,896 INFO L422 BasicCegarLoop]: trace histogram [53, 53, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:55,896 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53 [2020-08-19 03:42:55,897 INFO L427 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:55,897 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:55,897 INFO L82 PathProgramCache]: Analyzing trace with hash -893901913, now seen corresponding path program 53 times [2020-08-19 03:42:55,897 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:55,897 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [543972299] [2020-08-19 03:42:55,897 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:55,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:57,582 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:57,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:57,596 INFO L134 CoverageAnalysis]: Checked inductivity of 2809 backedges. 0 proven. 2809 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:57,596 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [543972299] [2020-08-19 03:42:57,597 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:57,597 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57] total 57 [2020-08-19 03:42:57,597 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [382615203] [2020-08-19 03:42:57,597 INFO L459 AbstractCegarLoop]: Interpolant automaton has 57 states [2020-08-19 03:42:57,597 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:57,598 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2020-08-19 03:42:57,599 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1542, Invalid=1650, Unknown=0, NotChecked=0, Total=3192 [2020-08-19 03:42:57,599 INFO L87 Difference]: Start difference. First operand 119 states and 119 transitions. Second operand 57 states. [2020-08-19 03:42:57,863 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:57,863 INFO L93 Difference]: Finished difference Result 128 states and 128 transitions. [2020-08-19 03:42:57,864 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2020-08-19 03:42:57,864 INFO L78 Accepts]: Start accepts. Automaton has 57 states. Word has length 118 [2020-08-19 03:42:57,864 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:57,865 INFO L225 Difference]: With dead ends: 128 [2020-08-19 03:42:57,865 INFO L226 Difference]: Without dead ends: 122 [2020-08-19 03:42:57,866 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1542, Invalid=1650, Unknown=0, NotChecked=0, Total=3192 [2020-08-19 03:42:57,866 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2020-08-19 03:42:57,869 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 121. [2020-08-19 03:42:57,870 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 121 states. [2020-08-19 03:42:57,870 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 121 transitions. [2020-08-19 03:42:57,870 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 121 transitions. Word has length 118 [2020-08-19 03:42:57,870 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:57,870 INFO L479 AbstractCegarLoop]: Abstraction has 121 states and 121 transitions. [2020-08-19 03:42:57,871 INFO L480 AbstractCegarLoop]: Interpolant automaton has 57 states. [2020-08-19 03:42:57,871 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 121 transitions. [2020-08-19 03:42:57,871 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2020-08-19 03:42:57,871 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:57,872 INFO L422 BasicCegarLoop]: trace histogram [54, 54, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:57,872 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable54 [2020-08-19 03:42:57,872 INFO L427 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:57,872 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:57,872 INFO L82 PathProgramCache]: Analyzing trace with hash -887000887, now seen corresponding path program 54 times [2020-08-19 03:42:57,872 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:57,872 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [454115106] [2020-08-19 03:42:57,873 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:57,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:59,557 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:59,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:59,571 INFO L134 CoverageAnalysis]: Checked inductivity of 2916 backedges. 0 proven. 2916 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:59,572 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [454115106] [2020-08-19 03:42:59,572 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:59,572 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58] total 58 [2020-08-19 03:42:59,572 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [334560602] [2020-08-19 03:42:59,572 INFO L459 AbstractCegarLoop]: Interpolant automaton has 58 states [2020-08-19 03:42:59,573 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:59,573 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2020-08-19 03:42:59,573 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1598, Invalid=1708, Unknown=0, NotChecked=0, Total=3306 [2020-08-19 03:42:59,574 INFO L87 Difference]: Start difference. First operand 121 states and 121 transitions. Second operand 58 states. [2020-08-19 03:42:59,944 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:59,944 INFO L93 Difference]: Finished difference Result 130 states and 130 transitions. [2020-08-19 03:42:59,945 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2020-08-19 03:42:59,945 INFO L78 Accepts]: Start accepts. Automaton has 58 states. Word has length 120 [2020-08-19 03:42:59,945 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:59,946 INFO L225 Difference]: With dead ends: 130 [2020-08-19 03:42:59,946 INFO L226 Difference]: Without dead ends: 124 [2020-08-19 03:42:59,947 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1598, Invalid=1708, Unknown=0, NotChecked=0, Total=3306 [2020-08-19 03:42:59,947 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2020-08-19 03:42:59,951 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 123. [2020-08-19 03:42:59,951 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 123 states. [2020-08-19 03:42:59,951 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 123 transitions. [2020-08-19 03:42:59,952 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 123 transitions. Word has length 120 [2020-08-19 03:42:59,952 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:59,952 INFO L479 AbstractCegarLoop]: Abstraction has 123 states and 123 transitions. [2020-08-19 03:42:59,952 INFO L480 AbstractCegarLoop]: Interpolant automaton has 58 states. [2020-08-19 03:42:59,952 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 123 transitions. [2020-08-19 03:42:59,953 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2020-08-19 03:42:59,953 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:59,953 INFO L422 BasicCegarLoop]: trace histogram [55, 55, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:59,953 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable55 [2020-08-19 03:42:59,953 INFO L427 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:59,953 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:59,954 INFO L82 PathProgramCache]: Analyzing trace with hash 1449917803, now seen corresponding path program 55 times [2020-08-19 03:42:59,954 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:59,954 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1796690636] [2020-08-19 03:42:59,954 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:59,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:43:01,756 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:43:01,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:43:01,771 INFO L134 CoverageAnalysis]: Checked inductivity of 3025 backedges. 0 proven. 3025 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:43:01,771 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1796690636] [2020-08-19 03:43:01,771 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:43:01,772 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [59] total 59 [2020-08-19 03:43:01,772 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [801727448] [2020-08-19 03:43:01,772 INFO L459 AbstractCegarLoop]: Interpolant automaton has 59 states [2020-08-19 03:43:01,772 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:43:01,773 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2020-08-19 03:43:01,773 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1655, Invalid=1767, Unknown=0, NotChecked=0, Total=3422 [2020-08-19 03:43:01,773 INFO L87 Difference]: Start difference. First operand 123 states and 123 transitions. Second operand 59 states. [2020-08-19 03:43:02,001 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:43:02,001 INFO L93 Difference]: Finished difference Result 132 states and 132 transitions. [2020-08-19 03:43:02,002 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2020-08-19 03:43:02,002 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 122 [2020-08-19 03:43:02,002 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:43:02,003 INFO L225 Difference]: With dead ends: 132 [2020-08-19 03:43:02,004 INFO L226 Difference]: Without dead ends: 126 [2020-08-19 03:43:02,004 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1655, Invalid=1767, Unknown=0, NotChecked=0, Total=3422 [2020-08-19 03:43:02,005 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2020-08-19 03:43:02,007 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 125. [2020-08-19 03:43:02,007 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 125 states. [2020-08-19 03:43:02,008 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 125 transitions. [2020-08-19 03:43:02,008 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 125 transitions. Word has length 122 [2020-08-19 03:43:02,008 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:43:02,008 INFO L479 AbstractCegarLoop]: Abstraction has 125 states and 125 transitions. [2020-08-19 03:43:02,008 INFO L480 AbstractCegarLoop]: Interpolant automaton has 59 states. [2020-08-19 03:43:02,009 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 125 transitions. [2020-08-19 03:43:02,009 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2020-08-19 03:43:02,009 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:43:02,009 INFO L422 BasicCegarLoop]: trace histogram [56, 56, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:43:02,009 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable56 [2020-08-19 03:43:02,010 INFO L427 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:43:02,010 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:43:02,010 INFO L82 PathProgramCache]: Analyzing trace with hash 960883085, now seen corresponding path program 56 times [2020-08-19 03:43:02,010 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:43:02,010 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [146395162] [2020-08-19 03:43:02,010 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:43:02,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:43:03,950 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:43:03,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:43:03,966 INFO L134 CoverageAnalysis]: Checked inductivity of 3136 backedges. 0 proven. 3136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:43:03,966 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [146395162] [2020-08-19 03:43:03,966 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:43:03,966 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60] total 60 [2020-08-19 03:43:03,967 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [481492416] [2020-08-19 03:43:03,967 INFO L459 AbstractCegarLoop]: Interpolant automaton has 60 states [2020-08-19 03:43:03,967 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:43:03,968 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2020-08-19 03:43:03,968 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1713, Invalid=1827, Unknown=0, NotChecked=0, Total=3540 [2020-08-19 03:43:03,968 INFO L87 Difference]: Start difference. First operand 125 states and 125 transitions. Second operand 60 states. [2020-08-19 03:43:04,374 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:43:04,374 INFO L93 Difference]: Finished difference Result 134 states and 134 transitions. [2020-08-19 03:43:04,375 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2020-08-19 03:43:04,375 INFO L78 Accepts]: Start accepts. Automaton has 60 states. Word has length 124 [2020-08-19 03:43:04,375 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:43:04,376 INFO L225 Difference]: With dead ends: 134 [2020-08-19 03:43:04,377 INFO L226 Difference]: Without dead ends: 128 [2020-08-19 03:43:04,377 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1713, Invalid=1827, Unknown=0, NotChecked=0, Total=3540 [2020-08-19 03:43:04,378 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2020-08-19 03:43:04,383 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 127. [2020-08-19 03:43:04,383 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 127 states. [2020-08-19 03:43:04,383 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 127 transitions. [2020-08-19 03:43:04,384 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 127 transitions. Word has length 124 [2020-08-19 03:43:04,384 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:43:04,384 INFO L479 AbstractCegarLoop]: Abstraction has 127 states and 127 transitions. [2020-08-19 03:43:04,384 INFO L480 AbstractCegarLoop]: Interpolant automaton has 60 states. [2020-08-19 03:43:04,384 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 127 transitions. [2020-08-19 03:43:04,385 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2020-08-19 03:43:04,385 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:43:04,385 INFO L422 BasicCegarLoop]: trace histogram [57, 57, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:43:04,385 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable57 [2020-08-19 03:43:04,385 INFO L427 AbstractCegarLoop]: === Iteration 59 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:43:04,386 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:43:04,386 INFO L82 PathProgramCache]: Analyzing trace with hash -850045649, now seen corresponding path program 57 times [2020-08-19 03:43:04,386 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:43:04,386 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1574611226] [2020-08-19 03:43:04,386 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:43:04,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:43:06,310 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:43:06,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:43:06,324 INFO L134 CoverageAnalysis]: Checked inductivity of 3249 backedges. 0 proven. 3249 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:43:06,324 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1574611226] [2020-08-19 03:43:06,324 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:43:06,325 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [61] total 61 [2020-08-19 03:43:06,325 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [820640384] [2020-08-19 03:43:06,325 INFO L459 AbstractCegarLoop]: Interpolant automaton has 61 states [2020-08-19 03:43:06,325 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:43:06,326 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2020-08-19 03:43:06,326 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1772, Invalid=1888, Unknown=0, NotChecked=0, Total=3660 [2020-08-19 03:43:06,326 INFO L87 Difference]: Start difference. First operand 127 states and 127 transitions. Second operand 61 states. [2020-08-19 03:43:06,593 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:43:06,593 INFO L93 Difference]: Finished difference Result 136 states and 136 transitions. [2020-08-19 03:43:06,594 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2020-08-19 03:43:06,594 INFO L78 Accepts]: Start accepts. Automaton has 61 states. Word has length 126 [2020-08-19 03:43:06,594 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:43:06,595 INFO L225 Difference]: With dead ends: 136 [2020-08-19 03:43:06,595 INFO L226 Difference]: Without dead ends: 130 [2020-08-19 03:43:06,596 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 57 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1772, Invalid=1888, Unknown=0, NotChecked=0, Total=3660 [2020-08-19 03:43:06,596 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2020-08-19 03:43:06,600 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 129. [2020-08-19 03:43:06,600 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 129 states. [2020-08-19 03:43:06,601 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 129 transitions. [2020-08-19 03:43:06,601 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 129 transitions. Word has length 126 [2020-08-19 03:43:06,601 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:43:06,601 INFO L479 AbstractCegarLoop]: Abstraction has 129 states and 129 transitions. [2020-08-19 03:43:06,601 INFO L480 AbstractCegarLoop]: Interpolant automaton has 61 states. [2020-08-19 03:43:06,601 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 129 transitions. [2020-08-19 03:43:06,602 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2020-08-19 03:43:06,602 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:43:06,602 INFO L422 BasicCegarLoop]: trace histogram [58, 58, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:43:06,602 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable58 [2020-08-19 03:43:06,603 INFO L427 AbstractCegarLoop]: === Iteration 60 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:43:06,603 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:43:06,603 INFO L82 PathProgramCache]: Analyzing trace with hash -1690804143, now seen corresponding path program 58 times [2020-08-19 03:43:06,603 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:43:06,603 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1498295250] [2020-08-19 03:43:06,604 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:43:06,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat