/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5000 --traceabstraction.additional.smt.options interpolation-heuristic=BIGGEST --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops/heavy-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 17:27:34,876 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 17:27:34,879 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 17:27:34,904 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 17:27:34,904 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 17:27:34,905 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 17:27:34,907 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 17:27:34,908 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 17:27:34,910 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 17:27:34,911 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 17:27:34,912 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 17:27:34,913 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 17:27:34,914 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 17:27:34,915 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 17:27:34,916 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 17:27:34,917 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 17:27:34,918 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 17:27:34,919 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 17:27:34,920 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 17:27:34,922 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 17:27:34,924 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 17:27:34,925 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 17:27:34,927 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 17:27:34,928 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 17:27:34,930 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-21 17:27:34,931 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-21 17:27:34,931 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-21 17:27:34,932 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-21 17:27:34,932 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-21 17:27:34,933 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-08-21 17:27:34,933 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-08-21 17:27:34,934 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-08-21 17:27:34,936 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-08-21 17:27:34,937 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-08-21 17:27:34,938 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-08-21 17:27:34,939 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-08-21 17:27:34,940 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-08-21 17:27:34,940 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-08-21 17:27:34,940 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 17:27:34,941 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 17:27:34,942 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 17:27:34,943 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-21 17:27:34,994 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 17:27:34,994 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 17:27:35,000 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 17:27:35,001 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 17:27:35,001 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 17:27:35,001 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 17:27:35,001 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 17:27:35,001 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 17:27:35,004 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 17:27:35,004 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 17:27:35,005 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 17:27:35,005 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 17:27:35,005 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 17:27:35,005 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 17:27:35,005 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 17:27:35,006 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 17:27:35,006 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 17:27:35,006 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 17:27:35,006 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 17:27:35,006 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 17:27:35,007 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 17:27:35,008 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 17:27:35,009 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 17:27:35,009 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 17:27:35,009 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 17:27:35,009 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 17:27:35,009 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 17:27:35,010 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 17:27:35,010 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 17:27:35,010 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=BIGGEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=BIGGEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=BIGGEST;log-additional-information=true; [2020-08-21 17:27:35,342 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 17:27:35,353 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 17:27:35,357 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 17:27:35,358 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 17:27:35,359 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 17:27:35,359 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/heavy-2.c [2020-08-21 17:27:35,438 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/a1f161673/9b548d010a89475a822259ea7176e6a1/FLAGeab9cee5e [2020-08-21 17:27:35,902 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 17:27:35,902 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loops/heavy-2.c [2020-08-21 17:27:35,909 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/a1f161673/9b548d010a89475a822259ea7176e6a1/FLAGeab9cee5e [2020-08-21 17:27:36,312 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/a1f161673/9b548d010a89475a822259ea7176e6a1 [2020-08-21 17:27:36,322 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 17:27:36,324 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 17:27:36,325 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 17:27:36,325 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 17:27:36,329 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 17:27:36,330 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 05:27:36" (1/1) ... [2020-08-21 17:27:36,333 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@35af59c1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:27:36, skipping insertion in model container [2020-08-21 17:27:36,334 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 05:27:36" (1/1) ... [2020-08-21 17:27:36,344 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 17:27:36,363 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 17:27:36,556 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 17:27:36,600 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 17:27:36,621 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 17:27:36,769 INFO L208 MainTranslator]: Completed translation [2020-08-21 17:27:36,770 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:27:36 WrapperNode [2020-08-21 17:27:36,770 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 17:27:36,771 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 17:27:36,771 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 17:27:36,771 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 17:27:36,784 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:27:36" (1/1) ... [2020-08-21 17:27:36,786 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:27:36" (1/1) ... [2020-08-21 17:27:36,794 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:27:36" (1/1) ... [2020-08-21 17:27:36,794 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:27:36" (1/1) ... [2020-08-21 17:27:36,802 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:27:36" (1/1) ... [2020-08-21 17:27:36,807 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:27:36" (1/1) ... [2020-08-21 17:27:36,809 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:27:36" (1/1) ... [2020-08-21 17:27:36,811 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 17:27:36,811 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 17:27:36,812 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 17:27:36,812 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 17:27:36,813 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:27:36" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 17:27:36,882 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 17:27:36,883 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 17:27:36,883 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 17:27:36,884 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 17:27:36,884 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 17:27:36,884 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-21 17:27:36,885 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-21 17:27:36,885 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 17:27:36,885 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-21 17:27:36,886 INFO L130 BoogieDeclarations]: Found specification of procedure write~unchecked~int [2020-08-21 17:27:36,887 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 17:27:36,887 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-21 17:27:37,179 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 17:27:37,180 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-08-21 17:27:37,183 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 05:27:37 BoogieIcfgContainer [2020-08-21 17:27:37,184 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 17:27:37,185 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 17:27:37,185 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 17:27:37,188 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 17:27:37,189 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 05:27:36" (1/3) ... [2020-08-21 17:27:37,189 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7b11d032 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 05:27:37, skipping insertion in model container [2020-08-21 17:27:37,190 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:27:36" (2/3) ... [2020-08-21 17:27:37,190 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7b11d032 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 05:27:37, skipping insertion in model container [2020-08-21 17:27:37,190 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 05:27:37" (3/3) ... [2020-08-21 17:27:37,192 INFO L109 eAbstractionObserver]: Analyzing ICFG heavy-2.c [2020-08-21 17:27:37,203 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 17:27:37,210 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 17:27:37,225 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 17:27:37,245 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 17:27:37,245 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 17:27:37,245 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 17:27:37,245 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 17:27:37,245 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 17:27:37,245 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 17:27:37,246 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 17:27:37,246 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 17:27:37,269 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states. [2020-08-21 17:27:37,274 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2020-08-21 17:27:37,274 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:37,275 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:27:37,276 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:37,283 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:37,284 INFO L82 PathProgramCache]: Analyzing trace with hash 242978043, now seen corresponding path program 1 times [2020-08-21 17:27:37,292 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:37,293 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [261377353] [2020-08-21 17:27:37,293 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:37,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:37,478 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:37,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:37,497 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:27:37,505 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [261377353] [2020-08-21 17:27:37,510 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 17:27:37,510 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-21 17:27:37,511 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1577423728] [2020-08-21 17:27:37,521 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-21 17:27:37,524 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:37,540 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-21 17:27:37,541 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 17:27:37,543 INFO L87 Difference]: Start difference. First operand 19 states. Second operand 3 states. [2020-08-21 17:27:37,648 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:37,648 INFO L93 Difference]: Finished difference Result 42 states and 61 transitions. [2020-08-21 17:27:37,649 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 17:27:37,650 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 9 [2020-08-21 17:27:37,651 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:37,661 INFO L225 Difference]: With dead ends: 42 [2020-08-21 17:27:37,661 INFO L226 Difference]: Without dead ends: 23 [2020-08-21 17:27:37,665 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 [2020-08-21 17:27:37,685 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-21 17:27:37,705 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 15. [2020-08-21 17:27:37,707 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-21 17:27:37,708 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2020-08-21 17:27:37,710 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 9 [2020-08-21 17:27:37,710 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:37,710 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2020-08-21 17:27:37,710 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-21 17:27:37,711 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2020-08-21 17:27:37,712 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2020-08-21 17:27:37,712 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:37,712 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:27:37,713 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 17:27:37,713 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:37,713 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:37,713 INFO L82 PathProgramCache]: Analyzing trace with hash 242949213, now seen corresponding path program 1 times [2020-08-21 17:27:37,714 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:37,714 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [167355828] [2020-08-21 17:27:37,714 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:37,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:37,822 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:37,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:37,853 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:27:37,857 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [167355828] [2020-08-21 17:27:37,857 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 17:27:37,858 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-21 17:27:37,858 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [826002208] [2020-08-21 17:27:37,861 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 17:27:37,861 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:37,864 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 17:27:37,864 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 17:27:37,864 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 4 states. [2020-08-21 17:27:38,015 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:38,015 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2020-08-21 17:27:38,016 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 17:27:38,016 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 9 [2020-08-21 17:27:38,016 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:38,017 INFO L225 Difference]: With dead ends: 36 [2020-08-21 17:27:38,018 INFO L226 Difference]: Without dead ends: 33 [2020-08-21 17:27:38,019 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-21 17:27:38,019 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-21 17:27:38,025 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 16. [2020-08-21 17:27:38,025 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-21 17:27:38,026 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2020-08-21 17:27:38,026 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 9 [2020-08-21 17:27:38,026 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:38,026 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2020-08-21 17:27:38,027 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 17:27:38,027 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2020-08-21 17:27:38,027 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-21 17:27:38,027 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:38,028 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:27:38,028 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 17:27:38,028 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:38,028 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:38,029 INFO L82 PathProgramCache]: Analyzing trace with hash 713101374, now seen corresponding path program 1 times [2020-08-21 17:27:38,029 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:38,029 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [950137270] [2020-08-21 17:27:38,029 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:38,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:38,093 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:38,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:38,104 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:27:38,104 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [950137270] [2020-08-21 17:27:38,105 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 17:27:38,105 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-21 17:27:38,105 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1095928956] [2020-08-21 17:27:38,106 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 17:27:38,106 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:38,106 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 17:27:38,107 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 17:27:38,107 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand 4 states. [2020-08-21 17:27:38,217 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:38,218 INFO L93 Difference]: Finished difference Result 40 states and 50 transitions. [2020-08-21 17:27:38,218 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 17:27:38,218 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 12 [2020-08-21 17:27:38,219 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:38,220 INFO L225 Difference]: With dead ends: 40 [2020-08-21 17:27:38,220 INFO L226 Difference]: Without dead ends: 31 [2020-08-21 17:27:38,221 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-21 17:27:38,221 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-21 17:27:38,226 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 17. [2020-08-21 17:27:38,226 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-21 17:27:38,227 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2020-08-21 17:27:38,228 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 12 [2020-08-21 17:27:38,228 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:38,228 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2020-08-21 17:27:38,228 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 17:27:38,229 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2020-08-21 17:27:38,229 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-21 17:27:38,229 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:38,230 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:27:38,230 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 17:27:38,230 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:38,231 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:38,231 INFO L82 PathProgramCache]: Analyzing trace with hash -1111837415, now seen corresponding path program 1 times [2020-08-21 17:27:38,231 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:38,232 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1635439392] [2020-08-21 17:27:38,232 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:38,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:38,334 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:38,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:38,344 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:27:38,344 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1635439392] [2020-08-21 17:27:38,345 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 17:27:38,345 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-21 17:27:38,345 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [749584105] [2020-08-21 17:27:38,346 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 17:27:38,346 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:38,346 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 17:27:38,347 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 17:27:38,347 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand 4 states. [2020-08-21 17:27:38,424 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:38,424 INFO L93 Difference]: Finished difference Result 31 states and 37 transitions. [2020-08-21 17:27:38,424 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 17:27:38,425 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 15 [2020-08-21 17:27:38,425 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:38,426 INFO L225 Difference]: With dead ends: 31 [2020-08-21 17:27:38,426 INFO L226 Difference]: Without dead ends: 21 [2020-08-21 17:27:38,427 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-21 17:27:38,427 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-21 17:27:38,432 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 18. [2020-08-21 17:27:38,432 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-21 17:27:38,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2020-08-21 17:27:38,433 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 15 [2020-08-21 17:27:38,434 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:38,434 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2020-08-21 17:27:38,434 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 17:27:38,434 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2020-08-21 17:27:38,435 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-21 17:27:38,435 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:38,435 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:27:38,436 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 17:27:38,436 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:38,436 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:38,437 INFO L82 PathProgramCache]: Analyzing trace with hash 1672606071, now seen corresponding path program 1 times [2020-08-21 17:27:38,437 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:38,437 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [137978342] [2020-08-21 17:27:38,438 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:38,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:38,546 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:38,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:38,555 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:27:38,556 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [137978342] [2020-08-21 17:27:38,556 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:38,556 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-21 17:27:38,556 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [823647973] [2020-08-21 17:27:38,557 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 17:27:38,557 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:38,558 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 17:27:38,558 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-21 17:27:38,558 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 5 states. [2020-08-21 17:27:38,645 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:38,646 INFO L93 Difference]: Finished difference Result 34 states and 39 transitions. [2020-08-21 17:27:38,646 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 17:27:38,646 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2020-08-21 17:27:38,647 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:38,647 INFO L225 Difference]: With dead ends: 34 [2020-08-21 17:27:38,648 INFO L226 Difference]: Without dead ends: 23 [2020-08-21 17:27:38,648 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2020-08-21 17:27:38,649 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-21 17:27:38,653 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 20. [2020-08-21 17:27:38,653 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-21 17:27:38,654 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2020-08-21 17:27:38,655 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 17 [2020-08-21 17:27:38,655 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:38,655 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2020-08-21 17:27:38,655 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 17:27:38,656 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2020-08-21 17:27:38,656 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-21 17:27:38,656 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:38,657 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:27:38,657 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 17:27:38,657 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:38,657 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:38,658 INFO L82 PathProgramCache]: Analyzing trace with hash 1758170709, now seen corresponding path program 2 times [2020-08-21 17:27:38,658 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:38,658 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1526881779] [2020-08-21 17:27:38,659 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:38,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:38,800 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:38,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:38,807 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:27:38,808 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1526881779] [2020-08-21 17:27:38,808 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:38,808 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-21 17:27:38,808 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [66638712] [2020-08-21 17:27:38,809 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 17:27:38,809 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:38,809 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 17:27:38,810 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-21 17:27:38,810 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand 6 states. [2020-08-21 17:27:38,901 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:38,901 INFO L93 Difference]: Finished difference Result 38 states and 43 transitions. [2020-08-21 17:27:38,902 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 17:27:38,902 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 19 [2020-08-21 17:27:38,903 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:38,903 INFO L225 Difference]: With dead ends: 38 [2020-08-21 17:27:38,903 INFO L226 Difference]: Without dead ends: 25 [2020-08-21 17:27:38,904 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2020-08-21 17:27:38,904 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-21 17:27:38,908 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 22. [2020-08-21 17:27:38,908 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-08-21 17:27:38,909 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2020-08-21 17:27:38,910 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 19 [2020-08-21 17:27:38,910 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:38,910 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2020-08-21 17:27:38,910 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 17:27:38,910 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2020-08-21 17:27:38,911 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-08-21 17:27:38,911 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:38,911 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:27:38,912 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 17:27:38,912 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:38,912 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:38,912 INFO L82 PathProgramCache]: Analyzing trace with hash -1913558093, now seen corresponding path program 3 times [2020-08-21 17:27:38,913 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:38,913 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [364867912] [2020-08-21 17:27:38,913 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:38,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:39,072 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:39,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:39,078 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:27:39,079 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [364867912] [2020-08-21 17:27:39,079 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:39,079 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 17:27:39,080 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [604342789] [2020-08-21 17:27:39,080 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 17:27:39,081 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:39,081 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 17:27:39,081 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-08-21 17:27:39,081 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand 7 states. [2020-08-21 17:27:39,209 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:39,209 INFO L93 Difference]: Finished difference Result 42 states and 47 transitions. [2020-08-21 17:27:39,210 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-21 17:27:39,210 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 21 [2020-08-21 17:27:39,211 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:39,211 INFO L225 Difference]: With dead ends: 42 [2020-08-21 17:27:39,212 INFO L226 Difference]: Without dead ends: 27 [2020-08-21 17:27:39,213 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2020-08-21 17:27:39,213 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-08-21 17:27:39,217 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 24. [2020-08-21 17:27:39,218 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-21 17:27:39,219 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2020-08-21 17:27:39,219 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 21 [2020-08-21 17:27:39,219 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:39,219 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2020-08-21 17:27:39,220 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 17:27:39,220 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2020-08-21 17:27:39,220 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-08-21 17:27:39,221 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:39,221 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:27:39,221 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 17:27:39,221 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:39,222 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:39,222 INFO L82 PathProgramCache]: Analyzing trace with hash 18180497, now seen corresponding path program 4 times [2020-08-21 17:27:39,222 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:39,222 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1942155134] [2020-08-21 17:27:39,223 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:39,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:39,365 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:39,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:39,370 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 2 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:27:39,371 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1942155134] [2020-08-21 17:27:39,371 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:39,371 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 17:27:39,372 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1166532266] [2020-08-21 17:27:39,372 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 17:27:39,372 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:39,373 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 17:27:39,373 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-08-21 17:27:39,373 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand 8 states. [2020-08-21 17:27:39,526 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:39,526 INFO L93 Difference]: Finished difference Result 46 states and 51 transitions. [2020-08-21 17:27:39,527 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 17:27:39,527 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 23 [2020-08-21 17:27:39,527 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:39,527 INFO L225 Difference]: With dead ends: 46 [2020-08-21 17:27:39,528 INFO L226 Difference]: Without dead ends: 29 [2020-08-21 17:27:39,528 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-08-21 17:27:39,529 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-21 17:27:39,532 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 26. [2020-08-21 17:27:39,533 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-21 17:27:39,533 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2020-08-21 17:27:39,534 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 23 [2020-08-21 17:27:39,534 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:39,534 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2020-08-21 17:27:39,534 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 17:27:39,534 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2020-08-21 17:27:39,535 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-21 17:27:39,535 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:39,535 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:27:39,535 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-21 17:27:39,536 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:39,536 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:39,536 INFO L82 PathProgramCache]: Analyzing trace with hash 993093615, now seen corresponding path program 5 times [2020-08-21 17:27:39,536 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:39,537 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [334067166] [2020-08-21 17:27:39,537 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:39,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:39,668 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:39,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:39,675 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:27:39,675 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [334067166] [2020-08-21 17:27:39,675 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:39,676 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 17:27:39,676 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [988295401] [2020-08-21 17:27:39,676 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 17:27:39,677 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:39,677 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 17:27:39,677 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2020-08-21 17:27:39,677 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 9 states. [2020-08-21 17:27:39,817 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:39,817 INFO L93 Difference]: Finished difference Result 50 states and 55 transitions. [2020-08-21 17:27:39,817 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 17:27:39,817 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 25 [2020-08-21 17:27:39,818 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:39,818 INFO L225 Difference]: With dead ends: 50 [2020-08-21 17:27:39,819 INFO L226 Difference]: Without dead ends: 31 [2020-08-21 17:27:39,819 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2020-08-21 17:27:39,820 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-21 17:27:39,824 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 28. [2020-08-21 17:27:39,824 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-21 17:27:39,825 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2020-08-21 17:27:39,825 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 25 [2020-08-21 17:27:39,825 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:39,826 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2020-08-21 17:27:39,826 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 17:27:39,826 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2020-08-21 17:27:39,826 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-21 17:27:39,827 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:39,827 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:27:39,827 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-21 17:27:39,827 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:39,828 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:39,828 INFO L82 PathProgramCache]: Analyzing trace with hash 1581729485, now seen corresponding path program 6 times [2020-08-21 17:27:39,828 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:39,828 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [431803964] [2020-08-21 17:27:39,829 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:39,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:40,033 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:40,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:40,057 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 2 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:27:40,058 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [431803964] [2020-08-21 17:27:40,058 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:40,058 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-21 17:27:40,058 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [78538166] [2020-08-21 17:27:40,059 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 17:27:40,059 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:40,059 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 17:27:40,060 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2020-08-21 17:27:40,060 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand 10 states. [2020-08-21 17:27:40,240 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:40,240 INFO L93 Difference]: Finished difference Result 54 states and 59 transitions. [2020-08-21 17:27:40,241 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-21 17:27:40,241 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-08-21 17:27:40,242 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:40,242 INFO L225 Difference]: With dead ends: 54 [2020-08-21 17:27:40,242 INFO L226 Difference]: Without dead ends: 33 [2020-08-21 17:27:40,243 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2020-08-21 17:27:40,243 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-21 17:27:40,248 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 30. [2020-08-21 17:27:40,248 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-08-21 17:27:40,249 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2020-08-21 17:27:40,249 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 27 [2020-08-21 17:27:40,249 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:40,250 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2020-08-21 17:27:40,250 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 17:27:40,250 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2020-08-21 17:27:40,251 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-08-21 17:27:40,251 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:40,251 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:27:40,251 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-21 17:27:40,251 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:40,252 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:40,252 INFO L82 PathProgramCache]: Analyzing trace with hash 325117483, now seen corresponding path program 7 times [2020-08-21 17:27:40,252 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:40,252 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1639716167] [2020-08-21 17:27:40,252 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:40,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:40,425 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:40,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:40,431 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 2 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:27:40,431 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1639716167] [2020-08-21 17:27:40,432 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:40,432 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-21 17:27:40,432 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1727323600] [2020-08-21 17:27:40,433 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 17:27:40,433 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:40,433 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 17:27:40,433 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2020-08-21 17:27:40,433 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand 11 states. [2020-08-21 17:27:40,627 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:40,627 INFO L93 Difference]: Finished difference Result 58 states and 63 transitions. [2020-08-21 17:27:40,628 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-21 17:27:40,628 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 29 [2020-08-21 17:27:40,628 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:40,629 INFO L225 Difference]: With dead ends: 58 [2020-08-21 17:27:40,629 INFO L226 Difference]: Without dead ends: 35 [2020-08-21 17:27:40,629 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=101, Unknown=0, NotChecked=0, Total=132 [2020-08-21 17:27:40,630 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-21 17:27:40,634 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 32. [2020-08-21 17:27:40,634 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-08-21 17:27:40,634 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2020-08-21 17:27:40,635 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 29 [2020-08-21 17:27:40,635 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:40,635 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2020-08-21 17:27:40,635 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 17:27:40,635 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2020-08-21 17:27:40,636 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-21 17:27:40,636 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:40,636 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:27:40,636 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-21 17:27:40,637 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:40,637 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:40,637 INFO L82 PathProgramCache]: Analyzing trace with hash -393206263, now seen corresponding path program 8 times [2020-08-21 17:27:40,637 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:40,638 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [485476222] [2020-08-21 17:27:40,638 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:40,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:40,823 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:40,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:40,829 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 2 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:27:40,829 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [485476222] [2020-08-21 17:27:40,830 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:40,830 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-21 17:27:40,830 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [960893492] [2020-08-21 17:27:40,830 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-21 17:27:40,831 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:40,831 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-21 17:27:40,831 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2020-08-21 17:27:40,831 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand 12 states. [2020-08-21 17:27:41,061 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:41,062 INFO L93 Difference]: Finished difference Result 62 states and 67 transitions. [2020-08-21 17:27:41,062 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-21 17:27:41,062 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 31 [2020-08-21 17:27:41,063 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:41,063 INFO L225 Difference]: With dead ends: 62 [2020-08-21 17:27:41,063 INFO L226 Difference]: Without dead ends: 37 [2020-08-21 17:27:41,064 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=34, Invalid=122, Unknown=0, NotChecked=0, Total=156 [2020-08-21 17:27:41,065 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-21 17:27:41,069 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 34. [2020-08-21 17:27:41,069 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-21 17:27:41,070 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 36 transitions. [2020-08-21 17:27:41,070 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 36 transitions. Word has length 31 [2020-08-21 17:27:41,070 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:41,070 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 36 transitions. [2020-08-21 17:27:41,071 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-21 17:27:41,071 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 36 transitions. [2020-08-21 17:27:41,071 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-21 17:27:41,071 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:41,072 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:27:41,072 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-21 17:27:41,072 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:41,072 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:41,073 INFO L82 PathProgramCache]: Analyzing trace with hash 787408487, now seen corresponding path program 9 times [2020-08-21 17:27:41,073 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:41,073 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1241926642] [2020-08-21 17:27:41,073 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:41,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:41,305 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:41,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:41,311 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 2 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:27:41,312 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1241926642] [2020-08-21 17:27:41,312 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:41,312 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 17:27:41,312 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1353618795] [2020-08-21 17:27:41,313 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 17:27:41,313 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:41,313 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 17:27:41,314 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2020-08-21 17:27:41,314 INFO L87 Difference]: Start difference. First operand 34 states and 36 transitions. Second operand 13 states. [2020-08-21 17:27:41,578 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:41,578 INFO L93 Difference]: Finished difference Result 66 states and 71 transitions. [2020-08-21 17:27:41,579 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-21 17:27:41,579 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 33 [2020-08-21 17:27:41,580 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:41,580 INFO L225 Difference]: With dead ends: 66 [2020-08-21 17:27:41,580 INFO L226 Difference]: Without dead ends: 39 [2020-08-21 17:27:41,581 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2020-08-21 17:27:41,581 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-21 17:27:41,591 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 36. [2020-08-21 17:27:41,591 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-21 17:27:41,593 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2020-08-21 17:27:41,593 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 33 [2020-08-21 17:27:41,594 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:41,594 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2020-08-21 17:27:41,594 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 17:27:41,594 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2020-08-21 17:27:41,595 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-08-21 17:27:41,595 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:41,595 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:27:41,595 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-21 17:27:41,595 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:41,596 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:41,596 INFO L82 PathProgramCache]: Analyzing trace with hash 1486817093, now seen corresponding path program 10 times [2020-08-21 17:27:41,596 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:41,596 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [668106753] [2020-08-21 17:27:41,597 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:41,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:41,823 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:41,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:41,832 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 2 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:27:41,833 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [668106753] [2020-08-21 17:27:41,833 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:41,833 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-21 17:27:41,833 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [969072932] [2020-08-21 17:27:41,834 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-21 17:27:41,834 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:41,834 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-21 17:27:41,835 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2020-08-21 17:27:41,835 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand 14 states. [2020-08-21 17:27:42,155 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:42,155 INFO L93 Difference]: Finished difference Result 70 states and 75 transitions. [2020-08-21 17:27:42,155 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-21 17:27:42,156 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 35 [2020-08-21 17:27:42,156 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:42,156 INFO L225 Difference]: With dead ends: 70 [2020-08-21 17:27:42,157 INFO L226 Difference]: Without dead ends: 41 [2020-08-21 17:27:42,158 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2020-08-21 17:27:42,160 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-21 17:27:42,167 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 38. [2020-08-21 17:27:42,170 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-21 17:27:42,170 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2020-08-21 17:27:42,171 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 35 [2020-08-21 17:27:42,171 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:42,173 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2020-08-21 17:27:42,173 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-21 17:27:42,173 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2020-08-21 17:27:42,174 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-21 17:27:42,174 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:42,174 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:27:42,174 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-21 17:27:42,175 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:42,175 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:42,175 INFO L82 PathProgramCache]: Analyzing trace with hash -691378013, now seen corresponding path program 11 times [2020-08-21 17:27:42,176 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:42,176 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1340419420] [2020-08-21 17:27:42,176 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:42,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:42,473 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:42,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:42,479 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 2 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:27:42,480 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1340419420] [2020-08-21 17:27:42,480 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:42,480 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-21 17:27:42,480 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [258915095] [2020-08-21 17:27:42,481 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-21 17:27:42,481 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:42,481 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-21 17:27:42,481 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=172, Unknown=0, NotChecked=0, Total=210 [2020-08-21 17:27:42,481 INFO L87 Difference]: Start difference. First operand 38 states and 40 transitions. Second operand 15 states. [2020-08-21 17:27:42,875 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:42,875 INFO L93 Difference]: Finished difference Result 74 states and 79 transitions. [2020-08-21 17:27:42,876 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-21 17:27:42,876 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 37 [2020-08-21 17:27:42,876 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:42,878 INFO L225 Difference]: With dead ends: 74 [2020-08-21 17:27:42,878 INFO L226 Difference]: Without dead ends: 43 [2020-08-21 17:27:42,879 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=43, Invalid=197, Unknown=0, NotChecked=0, Total=240 [2020-08-21 17:27:42,879 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-21 17:27:42,887 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 40. [2020-08-21 17:27:42,888 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-21 17:27:42,888 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 42 transitions. [2020-08-21 17:27:42,889 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 42 transitions. Word has length 37 [2020-08-21 17:27:42,889 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:42,889 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 42 transitions. [2020-08-21 17:27:42,889 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-21 17:27:42,889 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 42 transitions. [2020-08-21 17:27:42,890 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-21 17:27:42,890 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:42,890 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:27:42,891 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-21 17:27:42,891 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:42,891 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:42,891 INFO L82 PathProgramCache]: Analyzing trace with hash 2007165569, now seen corresponding path program 12 times [2020-08-21 17:27:42,892 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:42,892 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1827253698] [2020-08-21 17:27:42,892 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:42,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:43,161 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:43,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:43,169 INFO L134 CoverageAnalysis]: Checked inductivity of 146 backedges. 2 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:27:43,169 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1827253698] [2020-08-21 17:27:43,170 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:43,170 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-21 17:27:43,170 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1913226307] [2020-08-21 17:27:43,171 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-21 17:27:43,171 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:43,171 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-21 17:27:43,171 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2020-08-21 17:27:43,172 INFO L87 Difference]: Start difference. First operand 40 states and 42 transitions. Second operand 16 states. [2020-08-21 17:27:43,579 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:43,579 INFO L93 Difference]: Finished difference Result 78 states and 83 transitions. [2020-08-21 17:27:43,580 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-21 17:27:43,580 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 39 [2020-08-21 17:27:43,580 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:43,581 INFO L225 Difference]: With dead ends: 78 [2020-08-21 17:27:43,581 INFO L226 Difference]: Without dead ends: 45 [2020-08-21 17:27:43,582 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=46, Invalid=226, Unknown=0, NotChecked=0, Total=272 [2020-08-21 17:27:43,582 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-08-21 17:27:43,590 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 42. [2020-08-21 17:27:43,590 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-21 17:27:43,591 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 44 transitions. [2020-08-21 17:27:43,591 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 44 transitions. Word has length 39 [2020-08-21 17:27:43,591 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:43,592 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 44 transitions. [2020-08-21 17:27:43,592 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-21 17:27:43,592 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 44 transitions. [2020-08-21 17:27:43,594 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-21 17:27:43,594 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:43,594 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:27:43,594 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-21 17:27:43,595 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:43,595 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:43,595 INFO L82 PathProgramCache]: Analyzing trace with hash 1147301087, now seen corresponding path program 13 times [2020-08-21 17:27:43,595 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:43,595 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [442268522] [2020-08-21 17:27:43,596 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:43,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:43,937 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:43,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:43,944 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 2 proven. 169 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:27:43,945 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [442268522] [2020-08-21 17:27:43,945 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:43,945 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-21 17:27:43,945 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1991478005] [2020-08-21 17:27:43,946 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-21 17:27:43,946 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:43,946 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-21 17:27:43,947 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2020-08-21 17:27:43,947 INFO L87 Difference]: Start difference. First operand 42 states and 44 transitions. Second operand 17 states. [2020-08-21 17:27:44,355 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:44,355 INFO L93 Difference]: Finished difference Result 82 states and 87 transitions. [2020-08-21 17:27:44,356 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-21 17:27:44,356 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 41 [2020-08-21 17:27:44,356 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:44,357 INFO L225 Difference]: With dead ends: 82 [2020-08-21 17:27:44,357 INFO L226 Difference]: Without dead ends: 47 [2020-08-21 17:27:44,358 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2020-08-21 17:27:44,358 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-21 17:27:44,363 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 44. [2020-08-21 17:27:44,364 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-21 17:27:44,364 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 46 transitions. [2020-08-21 17:27:44,364 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 46 transitions. Word has length 41 [2020-08-21 17:27:44,365 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:44,365 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 46 transitions. [2020-08-21 17:27:44,365 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-21 17:27:44,365 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 46 transitions. [2020-08-21 17:27:44,365 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-21 17:27:44,366 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:44,366 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:27:44,366 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-21 17:27:44,366 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:44,367 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:44,367 INFO L82 PathProgramCache]: Analyzing trace with hash -548745283, now seen corresponding path program 14 times [2020-08-21 17:27:44,367 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:44,367 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1390807036] [2020-08-21 17:27:44,367 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:44,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:44,736 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:44,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:44,743 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 2 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:27:44,744 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1390807036] [2020-08-21 17:27:44,744 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:44,744 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-21 17:27:44,744 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1029441478] [2020-08-21 17:27:44,745 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-21 17:27:44,745 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:44,745 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-21 17:27:44,746 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=259, Unknown=0, NotChecked=0, Total=306 [2020-08-21 17:27:44,746 INFO L87 Difference]: Start difference. First operand 44 states and 46 transitions. Second operand 18 states. [2020-08-21 17:27:45,227 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:45,228 INFO L93 Difference]: Finished difference Result 86 states and 91 transitions. [2020-08-21 17:27:45,228 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-21 17:27:45,228 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 43 [2020-08-21 17:27:45,229 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:45,229 INFO L225 Difference]: With dead ends: 86 [2020-08-21 17:27:45,229 INFO L226 Difference]: Without dead ends: 49 [2020-08-21 17:27:45,230 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=52, Invalid=290, Unknown=0, NotChecked=0, Total=342 [2020-08-21 17:27:45,231 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-21 17:27:45,239 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 46. [2020-08-21 17:27:45,239 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-21 17:27:45,240 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 48 transitions. [2020-08-21 17:27:45,240 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 48 transitions. Word has length 43 [2020-08-21 17:27:45,240 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:45,240 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 48 transitions. [2020-08-21 17:27:45,240 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-21 17:27:45,240 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 48 transitions. [2020-08-21 17:27:45,241 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-08-21 17:27:45,241 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:45,241 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:27:45,241 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-21 17:27:45,242 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:45,242 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:45,242 INFO L82 PathProgramCache]: Analyzing trace with hash 1638265627, now seen corresponding path program 15 times [2020-08-21 17:27:45,242 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:45,242 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1998055666] [2020-08-21 17:27:45,242 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:45,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:45,592 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:45,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:45,598 INFO L134 CoverageAnalysis]: Checked inductivity of 227 backedges. 2 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:27:45,599 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1998055666] [2020-08-21 17:27:45,599 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:45,599 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-21 17:27:45,600 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1291914256] [2020-08-21 17:27:45,601 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-21 17:27:45,601 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:45,601 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-21 17:27:45,602 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=292, Unknown=0, NotChecked=0, Total=342 [2020-08-21 17:27:45,602 INFO L87 Difference]: Start difference. First operand 46 states and 48 transitions. Second operand 19 states. [2020-08-21 17:27:46,134 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:46,135 INFO L93 Difference]: Finished difference Result 90 states and 95 transitions. [2020-08-21 17:27:46,135 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-21 17:27:46,136 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 45 [2020-08-21 17:27:46,136 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:46,136 INFO L225 Difference]: With dead ends: 90 [2020-08-21 17:27:46,137 INFO L226 Difference]: Without dead ends: 51 [2020-08-21 17:27:46,138 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=55, Invalid=325, Unknown=0, NotChecked=0, Total=380 [2020-08-21 17:27:46,138 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-08-21 17:27:46,144 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 48. [2020-08-21 17:27:46,144 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-21 17:27:46,144 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 50 transitions. [2020-08-21 17:27:46,148 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 50 transitions. Word has length 45 [2020-08-21 17:27:46,148 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:46,148 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 50 transitions. [2020-08-21 17:27:46,148 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-21 17:27:46,148 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 50 transitions. [2020-08-21 17:27:46,149 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-08-21 17:27:46,149 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:46,149 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:27:46,149 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-21 17:27:46,149 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:46,150 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:46,150 INFO L82 PathProgramCache]: Analyzing trace with hash -1178224903, now seen corresponding path program 16 times [2020-08-21 17:27:46,150 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:46,150 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1107162015] [2020-08-21 17:27:46,150 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:46,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:46,594 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:46,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:46,603 INFO L134 CoverageAnalysis]: Checked inductivity of 258 backedges. 2 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:27:46,603 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1107162015] [2020-08-21 17:27:46,604 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:46,604 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-21 17:27:46,604 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [204172322] [2020-08-21 17:27:46,605 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-21 17:27:46,605 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:46,606 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-21 17:27:46,607 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=327, Unknown=0, NotChecked=0, Total=380 [2020-08-21 17:27:46,607 INFO L87 Difference]: Start difference. First operand 48 states and 50 transitions. Second operand 20 states. [2020-08-21 17:27:47,173 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:47,173 INFO L93 Difference]: Finished difference Result 94 states and 99 transitions. [2020-08-21 17:27:47,175 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-21 17:27:47,175 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 47 [2020-08-21 17:27:47,175 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:47,176 INFO L225 Difference]: With dead ends: 94 [2020-08-21 17:27:47,176 INFO L226 Difference]: Without dead ends: 53 [2020-08-21 17:27:47,177 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=58, Invalid=362, Unknown=0, NotChecked=0, Total=420 [2020-08-21 17:27:47,178 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-08-21 17:27:47,181 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 50. [2020-08-21 17:27:47,181 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-08-21 17:27:47,182 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 52 transitions. [2020-08-21 17:27:47,182 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 52 transitions. Word has length 47 [2020-08-21 17:27:47,182 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:47,183 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 52 transitions. [2020-08-21 17:27:47,183 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-21 17:27:47,183 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 52 transitions. [2020-08-21 17:27:47,183 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-08-21 17:27:47,183 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:47,183 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:27:47,184 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-21 17:27:47,184 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:47,184 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:47,184 INFO L82 PathProgramCache]: Analyzing trace with hash -1996227753, now seen corresponding path program 17 times [2020-08-21 17:27:47,184 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:47,185 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1896779700] [2020-08-21 17:27:47,185 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:47,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:47,596 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:47,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:47,603 INFO L134 CoverageAnalysis]: Checked inductivity of 291 backedges. 2 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:27:47,603 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1896779700] [2020-08-21 17:27:47,604 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:47,604 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-21 17:27:47,604 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1127489043] [2020-08-21 17:27:47,604 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-21 17:27:47,605 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:47,605 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-21 17:27:47,605 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=364, Unknown=0, NotChecked=0, Total=420 [2020-08-21 17:27:47,606 INFO L87 Difference]: Start difference. First operand 50 states and 52 transitions. Second operand 21 states. [2020-08-21 17:27:48,200 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:48,201 INFO L93 Difference]: Finished difference Result 98 states and 103 transitions. [2020-08-21 17:27:48,201 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-21 17:27:48,201 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 49 [2020-08-21 17:27:48,202 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:48,202 INFO L225 Difference]: With dead ends: 98 [2020-08-21 17:27:48,202 INFO L226 Difference]: Without dead ends: 55 [2020-08-21 17:27:48,203 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=61, Invalid=401, Unknown=0, NotChecked=0, Total=462 [2020-08-21 17:27:48,203 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-08-21 17:27:48,213 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 52. [2020-08-21 17:27:48,213 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-08-21 17:27:48,213 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 54 transitions. [2020-08-21 17:27:48,216 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 54 transitions. Word has length 49 [2020-08-21 17:27:48,216 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:48,216 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 54 transitions. [2020-08-21 17:27:48,216 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-21 17:27:48,216 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 54 transitions. [2020-08-21 17:27:48,217 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-08-21 17:27:48,217 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:48,217 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:27:48,217 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-21 17:27:48,217 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:48,218 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:48,220 INFO L82 PathProgramCache]: Analyzing trace with hash -2117951435, now seen corresponding path program 18 times [2020-08-21 17:27:48,220 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:48,220 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2058011450] [2020-08-21 17:27:48,220 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:48,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:48,639 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:48,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:48,647 INFO L134 CoverageAnalysis]: Checked inductivity of 326 backedges. 2 proven. 324 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:27:48,648 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2058011450] [2020-08-21 17:27:48,648 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:48,648 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-21 17:27:48,648 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1948242011] [2020-08-21 17:27:48,649 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-21 17:27:48,649 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:48,649 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-21 17:27:48,650 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=403, Unknown=0, NotChecked=0, Total=462 [2020-08-21 17:27:48,650 INFO L87 Difference]: Start difference. First operand 52 states and 54 transitions. Second operand 22 states. [2020-08-21 17:27:49,315 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:49,315 INFO L93 Difference]: Finished difference Result 102 states and 107 transitions. [2020-08-21 17:27:49,320 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-21 17:27:49,320 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 51 [2020-08-21 17:27:49,320 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:49,321 INFO L225 Difference]: With dead ends: 102 [2020-08-21 17:27:49,321 INFO L226 Difference]: Without dead ends: 57 [2020-08-21 17:27:49,322 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=64, Invalid=442, Unknown=0, NotChecked=0, Total=506 [2020-08-21 17:27:49,322 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-08-21 17:27:49,328 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 54. [2020-08-21 17:27:49,329 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-08-21 17:27:49,330 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 56 transitions. [2020-08-21 17:27:49,330 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 56 transitions. Word has length 51 [2020-08-21 17:27:49,330 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:49,330 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 56 transitions. [2020-08-21 17:27:49,330 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-21 17:27:49,330 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 56 transitions. [2020-08-21 17:27:49,331 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-08-21 17:27:49,331 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:49,331 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:27:49,331 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-21 17:27:49,331 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:49,332 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:49,332 INFO L82 PathProgramCache]: Analyzing trace with hash 1164674451, now seen corresponding path program 19 times [2020-08-21 17:27:49,332 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:49,332 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [267354566] [2020-08-21 17:27:49,332 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:49,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:49,820 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:49,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:49,828 INFO L134 CoverageAnalysis]: Checked inductivity of 363 backedges. 2 proven. 361 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:27:49,829 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [267354566] [2020-08-21 17:27:49,829 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:49,829 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-21 17:27:49,829 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1578346109] [2020-08-21 17:27:49,830 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-21 17:27:49,830 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:49,830 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-21 17:27:49,831 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=444, Unknown=0, NotChecked=0, Total=506 [2020-08-21 17:27:49,831 INFO L87 Difference]: Start difference. First operand 54 states and 56 transitions. Second operand 23 states. [2020-08-21 17:27:50,567 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:50,567 INFO L93 Difference]: Finished difference Result 106 states and 111 transitions. [2020-08-21 17:27:50,568 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-21 17:27:50,569 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 53 [2020-08-21 17:27:50,570 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:50,570 INFO L225 Difference]: With dead ends: 106 [2020-08-21 17:27:50,571 INFO L226 Difference]: Without dead ends: 59 [2020-08-21 17:27:50,572 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=67, Invalid=485, Unknown=0, NotChecked=0, Total=552 [2020-08-21 17:27:50,573 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-08-21 17:27:50,577 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 56. [2020-08-21 17:27:50,578 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-08-21 17:27:50,578 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 58 transitions. [2020-08-21 17:27:50,578 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 58 transitions. Word has length 53 [2020-08-21 17:27:50,579 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:50,579 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 58 transitions. [2020-08-21 17:27:50,579 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-21 17:27:50,579 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 58 transitions. [2020-08-21 17:27:50,580 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-08-21 17:27:50,580 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:50,580 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:27:50,580 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-21 17:27:50,580 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:50,581 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:50,582 INFO L82 PathProgramCache]: Analyzing trace with hash -1032811663, now seen corresponding path program 20 times [2020-08-21 17:27:50,582 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:50,582 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1072154643] [2020-08-21 17:27:50,582 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:50,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:51,101 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:51,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:51,108 INFO L134 CoverageAnalysis]: Checked inductivity of 402 backedges. 2 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:27:51,109 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1072154643] [2020-08-21 17:27:51,109 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:51,109 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-21 17:27:51,109 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [602108497] [2020-08-21 17:27:51,109 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-21 17:27:51,109 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:51,110 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-21 17:27:51,110 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=487, Unknown=0, NotChecked=0, Total=552 [2020-08-21 17:27:51,110 INFO L87 Difference]: Start difference. First operand 56 states and 58 transitions. Second operand 24 states. [2020-08-21 17:27:51,922 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:51,923 INFO L93 Difference]: Finished difference Result 110 states and 115 transitions. [2020-08-21 17:27:51,923 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-21 17:27:51,923 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 55 [2020-08-21 17:27:51,924 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:51,924 INFO L225 Difference]: With dead ends: 110 [2020-08-21 17:27:51,924 INFO L226 Difference]: Without dead ends: 61 [2020-08-21 17:27:51,925 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=70, Invalid=530, Unknown=0, NotChecked=0, Total=600 [2020-08-21 17:27:51,925 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-08-21 17:27:51,930 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 58. [2020-08-21 17:27:51,930 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-08-21 17:27:51,930 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 60 transitions. [2020-08-21 17:27:51,930 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 60 transitions. Word has length 55 [2020-08-21 17:27:51,931 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:51,931 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 60 transitions. [2020-08-21 17:27:51,931 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-21 17:27:51,931 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 60 transitions. [2020-08-21 17:27:51,932 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-08-21 17:27:51,932 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:51,932 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:27:51,932 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-21 17:27:51,932 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:51,932 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:51,933 INFO L82 PathProgramCache]: Analyzing trace with hash 306942415, now seen corresponding path program 21 times [2020-08-21 17:27:51,933 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:51,933 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [260009370] [2020-08-21 17:27:51,933 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:51,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:52,466 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:52,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:52,476 INFO L134 CoverageAnalysis]: Checked inductivity of 443 backedges. 2 proven. 441 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:27:52,476 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [260009370] [2020-08-21 17:27:52,476 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:52,476 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-21 17:27:52,477 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1745716615] [2020-08-21 17:27:52,477 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-21 17:27:52,477 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:52,477 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-21 17:27:52,478 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=532, Unknown=0, NotChecked=0, Total=600 [2020-08-21 17:27:52,478 INFO L87 Difference]: Start difference. First operand 58 states and 60 transitions. Second operand 25 states. [2020-08-21 17:27:53,343 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:53,344 INFO L93 Difference]: Finished difference Result 114 states and 119 transitions. [2020-08-21 17:27:53,344 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-21 17:27:53,344 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 57 [2020-08-21 17:27:53,344 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:53,345 INFO L225 Difference]: With dead ends: 114 [2020-08-21 17:27:53,345 INFO L226 Difference]: Without dead ends: 63 [2020-08-21 17:27:53,346 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=73, Invalid=577, Unknown=0, NotChecked=0, Total=650 [2020-08-21 17:27:53,346 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-08-21 17:27:53,349 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 60. [2020-08-21 17:27:53,349 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-08-21 17:27:53,349 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 62 transitions. [2020-08-21 17:27:53,349 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 62 transitions. Word has length 57 [2020-08-21 17:27:53,350 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:53,350 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 62 transitions. [2020-08-21 17:27:53,350 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-21 17:27:53,350 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 62 transitions. [2020-08-21 17:27:53,350 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2020-08-21 17:27:53,350 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:53,350 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:27:53,350 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-21 17:27:53,351 INFO L427 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:53,351 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:53,351 INFO L82 PathProgramCache]: Analyzing trace with hash -679577427, now seen corresponding path program 22 times [2020-08-21 17:27:53,351 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:53,351 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1108031946] [2020-08-21 17:27:53,351 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:53,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:53,927 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:53,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:53,936 INFO L134 CoverageAnalysis]: Checked inductivity of 486 backedges. 2 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:27:53,936 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1108031946] [2020-08-21 17:27:53,937 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:53,937 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-21 17:27:53,937 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [427856347] [2020-08-21 17:27:53,937 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-21 17:27:53,938 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:53,938 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-21 17:27:53,938 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=579, Unknown=0, NotChecked=0, Total=650 [2020-08-21 17:27:53,938 INFO L87 Difference]: Start difference. First operand 60 states and 62 transitions. Second operand 26 states. [2020-08-21 17:27:54,859 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:54,859 INFO L93 Difference]: Finished difference Result 118 states and 123 transitions. [2020-08-21 17:27:54,860 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-21 17:27:54,860 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 59 [2020-08-21 17:27:54,860 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:54,861 INFO L225 Difference]: With dead ends: 118 [2020-08-21 17:27:54,862 INFO L226 Difference]: Without dead ends: 65 [2020-08-21 17:27:54,862 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=76, Invalid=626, Unknown=0, NotChecked=0, Total=702 [2020-08-21 17:27:54,863 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2020-08-21 17:27:54,867 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 62. [2020-08-21 17:27:54,868 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2020-08-21 17:27:54,868 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 64 transitions. [2020-08-21 17:27:54,869 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 64 transitions. Word has length 59 [2020-08-21 17:27:54,869 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:54,869 INFO L479 AbstractCegarLoop]: Abstraction has 62 states and 64 transitions. [2020-08-21 17:27:54,869 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-21 17:27:54,869 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 64 transitions. [2020-08-21 17:27:54,870 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2020-08-21 17:27:54,870 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:54,870 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:27:54,870 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-21 17:27:54,870 INFO L427 AbstractCegarLoop]: === Iteration 27 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:54,871 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:54,871 INFO L82 PathProgramCache]: Analyzing trace with hash 462626827, now seen corresponding path program 23 times [2020-08-21 17:27:54,871 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:54,871 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1851702439] [2020-08-21 17:27:54,871 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:54,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:55,529 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:55,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:55,539 INFO L134 CoverageAnalysis]: Checked inductivity of 531 backedges. 2 proven. 529 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:27:55,540 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1851702439] [2020-08-21 17:27:55,540 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:55,540 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-21 17:27:55,540 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1506969605] [2020-08-21 17:27:55,542 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-21 17:27:55,542 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:55,542 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-21 17:27:55,542 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=628, Unknown=0, NotChecked=0, Total=702 [2020-08-21 17:27:55,543 INFO L87 Difference]: Start difference. First operand 62 states and 64 transitions. Second operand 27 states. [2020-08-21 17:27:56,562 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:56,563 INFO L93 Difference]: Finished difference Result 122 states and 127 transitions. [2020-08-21 17:27:56,563 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-21 17:27:56,563 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 61 [2020-08-21 17:27:56,564 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:56,564 INFO L225 Difference]: With dead ends: 122 [2020-08-21 17:27:56,564 INFO L226 Difference]: Without dead ends: 67 [2020-08-21 17:27:56,565 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=79, Invalid=677, Unknown=0, NotChecked=0, Total=756 [2020-08-21 17:27:56,565 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2020-08-21 17:27:56,570 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 64. [2020-08-21 17:27:56,570 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-08-21 17:27:56,570 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 66 transitions. [2020-08-21 17:27:56,571 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 66 transitions. Word has length 61 [2020-08-21 17:27:56,571 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:56,571 INFO L479 AbstractCegarLoop]: Abstraction has 64 states and 66 transitions. [2020-08-21 17:27:56,571 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-21 17:27:56,571 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 66 transitions. [2020-08-21 17:27:56,572 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2020-08-21 17:27:56,572 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:56,572 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:27:56,572 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-21 17:27:56,573 INFO L427 AbstractCegarLoop]: === Iteration 28 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:56,573 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:56,573 INFO L82 PathProgramCache]: Analyzing trace with hash -1390712855, now seen corresponding path program 24 times [2020-08-21 17:27:56,573 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:56,574 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [879501424] [2020-08-21 17:27:56,574 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:56,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:57,277 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:57,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:57,288 INFO L134 CoverageAnalysis]: Checked inductivity of 578 backedges. 2 proven. 576 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:27:57,289 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [879501424] [2020-08-21 17:27:57,289 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:57,289 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-21 17:27:57,289 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [275199025] [2020-08-21 17:27:57,290 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-21 17:27:57,290 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:57,290 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-21 17:27:57,290 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=679, Unknown=0, NotChecked=0, Total=756 [2020-08-21 17:27:57,291 INFO L87 Difference]: Start difference. First operand 64 states and 66 transitions. Second operand 28 states. [2020-08-21 17:27:58,432 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:58,432 INFO L93 Difference]: Finished difference Result 126 states and 131 transitions. [2020-08-21 17:27:58,436 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-21 17:27:58,436 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 63 [2020-08-21 17:27:58,437 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:58,437 INFO L225 Difference]: With dead ends: 126 [2020-08-21 17:27:58,437 INFO L226 Difference]: Without dead ends: 69 [2020-08-21 17:27:58,438 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=82, Invalid=730, Unknown=0, NotChecked=0, Total=812 [2020-08-21 17:27:58,438 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2020-08-21 17:27:58,443 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 66. [2020-08-21 17:27:58,443 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-08-21 17:27:58,443 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 68 transitions. [2020-08-21 17:27:58,444 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 68 transitions. Word has length 63 [2020-08-21 17:27:58,444 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:58,444 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 68 transitions. [2020-08-21 17:27:58,444 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-21 17:27:58,444 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 68 transitions. [2020-08-21 17:27:58,445 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-08-21 17:27:58,445 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:58,445 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:27:58,445 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-21 17:27:58,445 INFO L427 AbstractCegarLoop]: === Iteration 29 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:58,446 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:58,446 INFO L82 PathProgramCache]: Analyzing trace with hash -38719417, now seen corresponding path program 25 times [2020-08-21 17:27:58,446 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:58,446 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1959066930] [2020-08-21 17:27:58,446 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:58,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:59,146 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:59,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:59,156 INFO L134 CoverageAnalysis]: Checked inductivity of 627 backedges. 2 proven. 625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:27:59,156 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1959066930] [2020-08-21 17:27:59,156 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:59,157 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-21 17:27:59,157 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2017601616] [2020-08-21 17:27:59,157 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-21 17:27:59,157 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:59,158 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-21 17:27:59,158 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=732, Unknown=0, NotChecked=0, Total=812 [2020-08-21 17:27:59,158 INFO L87 Difference]: Start difference. First operand 66 states and 68 transitions. Second operand 29 states. [2020-08-21 17:28:00,372 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:00,373 INFO L93 Difference]: Finished difference Result 130 states and 135 transitions. [2020-08-21 17:28:00,378 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-21 17:28:00,378 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 65 [2020-08-21 17:28:00,378 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:00,379 INFO L225 Difference]: With dead ends: 130 [2020-08-21 17:28:00,379 INFO L226 Difference]: Without dead ends: 71 [2020-08-21 17:28:00,380 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=85, Invalid=785, Unknown=0, NotChecked=0, Total=870 [2020-08-21 17:28:00,380 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2020-08-21 17:28:00,384 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 68. [2020-08-21 17:28:00,384 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2020-08-21 17:28:00,385 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 70 transitions. [2020-08-21 17:28:00,385 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 70 transitions. Word has length 65 [2020-08-21 17:28:00,385 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:00,385 INFO L479 AbstractCegarLoop]: Abstraction has 68 states and 70 transitions. [2020-08-21 17:28:00,385 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-21 17:28:00,386 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 70 transitions. [2020-08-21 17:28:00,386 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-08-21 17:28:00,386 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:00,386 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:00,386 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-21 17:28:00,387 INFO L427 AbstractCegarLoop]: === Iteration 30 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:00,387 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:00,387 INFO L82 PathProgramCache]: Analyzing trace with hash 2146851109, now seen corresponding path program 26 times [2020-08-21 17:28:00,387 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:00,387 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1719972850] [2020-08-21 17:28:00,387 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:00,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:01,366 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:01,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:01,386 INFO L134 CoverageAnalysis]: Checked inductivity of 678 backedges. 2 proven. 676 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:01,387 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1719972850] [2020-08-21 17:28:01,387 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:01,387 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-21 17:28:01,388 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [202388648] [2020-08-21 17:28:01,388 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-21 17:28:01,389 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:01,389 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-21 17:28:01,390 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=787, Unknown=0, NotChecked=0, Total=870 [2020-08-21 17:28:01,390 INFO L87 Difference]: Start difference. First operand 68 states and 70 transitions. Second operand 30 states. [2020-08-21 17:28:03,062 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:03,062 INFO L93 Difference]: Finished difference Result 134 states and 139 transitions. [2020-08-21 17:28:03,064 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-21 17:28:03,065 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 67 [2020-08-21 17:28:03,065 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:03,065 INFO L225 Difference]: With dead ends: 134 [2020-08-21 17:28:03,066 INFO L226 Difference]: Without dead ends: 73 [2020-08-21 17:28:03,066 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=88, Invalid=842, Unknown=0, NotChecked=0, Total=930 [2020-08-21 17:28:03,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-08-21 17:28:03,071 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 70. [2020-08-21 17:28:03,071 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-08-21 17:28:03,071 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 72 transitions. [2020-08-21 17:28:03,072 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 72 transitions. Word has length 67 [2020-08-21 17:28:03,072 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:03,072 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 72 transitions. [2020-08-21 17:28:03,072 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-21 17:28:03,072 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 72 transitions. [2020-08-21 17:28:03,073 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-08-21 17:28:03,073 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:03,073 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:03,073 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-21 17:28:03,073 INFO L427 AbstractCegarLoop]: === Iteration 31 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:03,074 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:03,074 INFO L82 PathProgramCache]: Analyzing trace with hash -2053848445, now seen corresponding path program 27 times [2020-08-21 17:28:03,074 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:03,074 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [94772468] [2020-08-21 17:28:03,074 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:03,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:03,861 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:03,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:03,871 INFO L134 CoverageAnalysis]: Checked inductivity of 731 backedges. 2 proven. 729 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:03,871 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [94772468] [2020-08-21 17:28:03,871 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:03,871 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-21 17:28:03,872 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1601676781] [2020-08-21 17:28:03,872 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-21 17:28:03,872 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:03,872 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-21 17:28:03,873 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=844, Unknown=0, NotChecked=0, Total=930 [2020-08-21 17:28:03,873 INFO L87 Difference]: Start difference. First operand 70 states and 72 transitions. Second operand 31 states. [2020-08-21 17:28:05,281 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:05,281 INFO L93 Difference]: Finished difference Result 138 states and 143 transitions. [2020-08-21 17:28:05,282 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-21 17:28:05,282 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 69 [2020-08-21 17:28:05,282 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:05,283 INFO L225 Difference]: With dead ends: 138 [2020-08-21 17:28:05,283 INFO L226 Difference]: Without dead ends: 75 [2020-08-21 17:28:05,284 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=91, Invalid=901, Unknown=0, NotChecked=0, Total=992 [2020-08-21 17:28:05,284 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2020-08-21 17:28:05,290 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 72. [2020-08-21 17:28:05,290 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2020-08-21 17:28:05,290 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 74 transitions. [2020-08-21 17:28:05,291 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 74 transitions. Word has length 69 [2020-08-21 17:28:05,291 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:05,291 INFO L479 AbstractCegarLoop]: Abstraction has 72 states and 74 transitions. [2020-08-21 17:28:05,291 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-21 17:28:05,291 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 74 transitions. [2020-08-21 17:28:05,291 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2020-08-21 17:28:05,291 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:05,292 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:05,292 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-21 17:28:05,292 INFO L427 AbstractCegarLoop]: === Iteration 32 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:05,292 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:05,292 INFO L82 PathProgramCache]: Analyzing trace with hash -1656861599, now seen corresponding path program 28 times [2020-08-21 17:28:05,292 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:05,292 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1072169079] [2020-08-21 17:28:05,293 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:05,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:06,186 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:06,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:06,200 INFO L134 CoverageAnalysis]: Checked inductivity of 786 backedges. 2 proven. 784 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:06,200 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1072169079] [2020-08-21 17:28:06,200 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:06,201 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-21 17:28:06,201 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [646290243] [2020-08-21 17:28:06,201 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-21 17:28:06,201 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:06,202 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-21 17:28:06,202 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=903, Unknown=0, NotChecked=0, Total=992 [2020-08-21 17:28:06,202 INFO L87 Difference]: Start difference. First operand 72 states and 74 transitions. Second operand 32 states. [2020-08-21 17:28:08,053 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:08,054 INFO L93 Difference]: Finished difference Result 142 states and 147 transitions. [2020-08-21 17:28:08,054 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-21 17:28:08,055 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 71 [2020-08-21 17:28:08,055 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:08,055 INFO L225 Difference]: With dead ends: 142 [2020-08-21 17:28:08,055 INFO L226 Difference]: Without dead ends: 77 [2020-08-21 17:28:08,056 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=94, Invalid=962, Unknown=0, NotChecked=0, Total=1056 [2020-08-21 17:28:08,057 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2020-08-21 17:28:08,061 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 74. [2020-08-21 17:28:08,061 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2020-08-21 17:28:08,062 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 76 transitions. [2020-08-21 17:28:08,062 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 76 transitions. Word has length 71 [2020-08-21 17:28:08,062 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:08,062 INFO L479 AbstractCegarLoop]: Abstraction has 74 states and 76 transitions. [2020-08-21 17:28:08,063 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-21 17:28:08,063 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 76 transitions. [2020-08-21 17:28:08,063 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2020-08-21 17:28:08,064 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:08,064 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:08,064 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-21 17:28:08,064 INFO L427 AbstractCegarLoop]: === Iteration 33 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:08,064 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:08,064 INFO L82 PathProgramCache]: Analyzing trace with hash 1890375359, now seen corresponding path program 29 times [2020-08-21 17:28:08,065 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:08,065 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1150565043] [2020-08-21 17:28:08,065 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:08,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:09,056 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:09,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:09,069 INFO L134 CoverageAnalysis]: Checked inductivity of 843 backedges. 2 proven. 841 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:09,070 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1150565043] [2020-08-21 17:28:09,070 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:09,070 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-21 17:28:09,070 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [561509065] [2020-08-21 17:28:09,071 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-21 17:28:09,071 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:09,071 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-21 17:28:09,071 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=964, Unknown=0, NotChecked=0, Total=1056 [2020-08-21 17:28:09,072 INFO L87 Difference]: Start difference. First operand 74 states and 76 transitions. Second operand 33 states. [2020-08-21 17:28:10,839 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:10,840 INFO L93 Difference]: Finished difference Result 146 states and 151 transitions. [2020-08-21 17:28:10,840 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-21 17:28:10,840 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 73 [2020-08-21 17:28:10,840 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:10,841 INFO L225 Difference]: With dead ends: 146 [2020-08-21 17:28:10,841 INFO L226 Difference]: Without dead ends: 79 [2020-08-21 17:28:10,842 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=97, Invalid=1025, Unknown=0, NotChecked=0, Total=1122 [2020-08-21 17:28:10,842 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2020-08-21 17:28:10,846 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 76. [2020-08-21 17:28:10,847 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-08-21 17:28:10,847 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 78 transitions. [2020-08-21 17:28:10,847 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 78 transitions. Word has length 73 [2020-08-21 17:28:10,848 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:10,848 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 78 transitions. [2020-08-21 17:28:10,848 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-21 17:28:10,848 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 78 transitions. [2020-08-21 17:28:10,849 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2020-08-21 17:28:10,849 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:10,849 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:10,849 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-21 17:28:10,849 INFO L427 AbstractCegarLoop]: === Iteration 34 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:10,849 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:10,849 INFO L82 PathProgramCache]: Analyzing trace with hash 581058973, now seen corresponding path program 30 times [2020-08-21 17:28:10,850 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:10,850 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1270870934] [2020-08-21 17:28:10,850 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:10,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:11,847 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:11,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:11,858 INFO L134 CoverageAnalysis]: Checked inductivity of 902 backedges. 2 proven. 900 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:11,859 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1270870934] [2020-08-21 17:28:11,859 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:11,859 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-21 17:28:11,859 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [219603259] [2020-08-21 17:28:11,860 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-21 17:28:11,860 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:11,860 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-21 17:28:11,861 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=1027, Unknown=0, NotChecked=0, Total=1122 [2020-08-21 17:28:11,861 INFO L87 Difference]: Start difference. First operand 76 states and 78 transitions. Second operand 34 states. [2020-08-21 17:28:13,635 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:13,635 INFO L93 Difference]: Finished difference Result 150 states and 155 transitions. [2020-08-21 17:28:13,637 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-21 17:28:13,637 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 75 [2020-08-21 17:28:13,637 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:13,638 INFO L225 Difference]: With dead ends: 150 [2020-08-21 17:28:13,638 INFO L226 Difference]: Without dead ends: 81 [2020-08-21 17:28:13,639 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=100, Invalid=1090, Unknown=0, NotChecked=0, Total=1190 [2020-08-21 17:28:13,639 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2020-08-21 17:28:13,649 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 78. [2020-08-21 17:28:13,650 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2020-08-21 17:28:13,650 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 80 transitions. [2020-08-21 17:28:13,650 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 80 transitions. Word has length 75 [2020-08-21 17:28:13,651 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:13,651 INFO L479 AbstractCegarLoop]: Abstraction has 78 states and 80 transitions. [2020-08-21 17:28:13,651 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-21 17:28:13,651 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 80 transitions. [2020-08-21 17:28:13,652 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2020-08-21 17:28:13,652 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:13,652 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:13,652 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-21 17:28:13,652 INFO L427 AbstractCegarLoop]: === Iteration 35 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:13,653 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:13,653 INFO L82 PathProgramCache]: Analyzing trace with hash 753429755, now seen corresponding path program 31 times [2020-08-21 17:28:13,653 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:13,653 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2027480291] [2020-08-21 17:28:13,653 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:13,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:14,652 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:14,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:14,682 INFO L134 CoverageAnalysis]: Checked inductivity of 963 backedges. 2 proven. 961 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:14,682 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2027480291] [2020-08-21 17:28:14,682 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:14,683 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-21 17:28:14,684 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1160879276] [2020-08-21 17:28:14,685 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-21 17:28:14,685 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:14,686 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-21 17:28:14,686 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=1092, Unknown=0, NotChecked=0, Total=1190 [2020-08-21 17:28:14,686 INFO L87 Difference]: Start difference. First operand 78 states and 80 transitions. Second operand 35 states. [2020-08-21 17:28:16,543 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:16,544 INFO L93 Difference]: Finished difference Result 154 states and 159 transitions. [2020-08-21 17:28:16,544 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-21 17:28:16,544 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 77 [2020-08-21 17:28:16,545 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:16,546 INFO L225 Difference]: With dead ends: 154 [2020-08-21 17:28:16,546 INFO L226 Difference]: Without dead ends: 83 [2020-08-21 17:28:16,547 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=103, Invalid=1157, Unknown=0, NotChecked=0, Total=1260 [2020-08-21 17:28:16,547 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2020-08-21 17:28:16,552 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 80. [2020-08-21 17:28:16,552 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2020-08-21 17:28:16,553 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 82 transitions. [2020-08-21 17:28:16,553 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 82 transitions. Word has length 77 [2020-08-21 17:28:16,553 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:16,553 INFO L479 AbstractCegarLoop]: Abstraction has 80 states and 82 transitions. [2020-08-21 17:28:16,554 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-21 17:28:16,554 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 82 transitions. [2020-08-21 17:28:16,554 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2020-08-21 17:28:16,554 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:16,554 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:16,555 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-21 17:28:16,555 INFO L427 AbstractCegarLoop]: === Iteration 36 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:16,555 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:16,555 INFO L82 PathProgramCache]: Analyzing trace with hash -1101973287, now seen corresponding path program 32 times [2020-08-21 17:28:16,555 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:16,555 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1933733001] [2020-08-21 17:28:16,556 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:16,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:17,729 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:17,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:17,743 INFO L134 CoverageAnalysis]: Checked inductivity of 1026 backedges. 2 proven. 1024 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:17,743 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1933733001] [2020-08-21 17:28:17,743 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:17,743 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-21 17:28:17,743 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [928778587] [2020-08-21 17:28:17,744 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-21 17:28:17,744 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:17,744 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-21 17:28:17,745 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=1159, Unknown=0, NotChecked=0, Total=1260 [2020-08-21 17:28:17,745 INFO L87 Difference]: Start difference. First operand 80 states and 82 transitions. Second operand 36 states. [2020-08-21 17:28:19,697 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:19,698 INFO L93 Difference]: Finished difference Result 158 states and 163 transitions. [2020-08-21 17:28:19,699 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-21 17:28:19,699 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 79 [2020-08-21 17:28:19,699 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:19,699 INFO L225 Difference]: With dead ends: 158 [2020-08-21 17:28:19,700 INFO L226 Difference]: Without dead ends: 85 [2020-08-21 17:28:19,700 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=106, Invalid=1226, Unknown=0, NotChecked=0, Total=1332 [2020-08-21 17:28:19,701 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2020-08-21 17:28:19,705 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 82. [2020-08-21 17:28:19,705 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2020-08-21 17:28:19,706 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 84 transitions. [2020-08-21 17:28:19,706 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 84 transitions. Word has length 79 [2020-08-21 17:28:19,706 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:19,706 INFO L479 AbstractCegarLoop]: Abstraction has 82 states and 84 transitions. [2020-08-21 17:28:19,707 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-21 17:28:19,707 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 84 transitions. [2020-08-21 17:28:19,707 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2020-08-21 17:28:19,707 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:19,707 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:19,707 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-21 17:28:19,708 INFO L427 AbstractCegarLoop]: === Iteration 37 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:19,708 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:19,708 INFO L82 PathProgramCache]: Analyzing trace with hash -1732868809, now seen corresponding path program 33 times [2020-08-21 17:28:19,708 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:19,708 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [714762783] [2020-08-21 17:28:19,708 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:19,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:20,859 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:20,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:20,872 INFO L134 CoverageAnalysis]: Checked inductivity of 1091 backedges. 2 proven. 1089 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:20,872 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [714762783] [2020-08-21 17:28:20,872 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:20,873 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-21 17:28:20,873 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1646468146] [2020-08-21 17:28:20,873 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-21 17:28:20,873 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:20,873 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-21 17:28:20,874 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=1228, Unknown=0, NotChecked=0, Total=1332 [2020-08-21 17:28:20,874 INFO L87 Difference]: Start difference. First operand 82 states and 84 transitions. Second operand 37 states. [2020-08-21 17:28:22,854 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:22,856 INFO L93 Difference]: Finished difference Result 162 states and 167 transitions. [2020-08-21 17:28:22,856 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-21 17:28:22,856 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 81 [2020-08-21 17:28:22,857 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:22,857 INFO L225 Difference]: With dead ends: 162 [2020-08-21 17:28:22,857 INFO L226 Difference]: Without dead ends: 87 [2020-08-21 17:28:22,859 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=109, Invalid=1297, Unknown=0, NotChecked=0, Total=1406 [2020-08-21 17:28:22,859 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2020-08-21 17:28:22,863 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 84. [2020-08-21 17:28:22,864 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2020-08-21 17:28:22,864 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 86 transitions. [2020-08-21 17:28:22,864 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 86 transitions. Word has length 81 [2020-08-21 17:28:22,865 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:22,865 INFO L479 AbstractCegarLoop]: Abstraction has 84 states and 86 transitions. [2020-08-21 17:28:22,865 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-21 17:28:22,865 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 86 transitions. [2020-08-21 17:28:22,866 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2020-08-21 17:28:22,866 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:22,866 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:22,866 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-21 17:28:22,866 INFO L427 AbstractCegarLoop]: === Iteration 38 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:22,866 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:22,867 INFO L82 PathProgramCache]: Analyzing trace with hash 1861890581, now seen corresponding path program 34 times [2020-08-21 17:28:22,867 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:22,867 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [952324041] [2020-08-21 17:28:22,867 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:22,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:24,050 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:24,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:24,063 INFO L134 CoverageAnalysis]: Checked inductivity of 1158 backedges. 2 proven. 1156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:24,064 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [952324041] [2020-08-21 17:28:24,064 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:24,064 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-21 17:28:24,064 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1114955482] [2020-08-21 17:28:24,065 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-21 17:28:24,065 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:24,065 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-21 17:28:24,066 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=1299, Unknown=0, NotChecked=0, Total=1406 [2020-08-21 17:28:24,066 INFO L87 Difference]: Start difference. First operand 84 states and 86 transitions. Second operand 38 states. [2020-08-21 17:28:26,266 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:26,266 INFO L93 Difference]: Finished difference Result 166 states and 171 transitions. [2020-08-21 17:28:26,270 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-21 17:28:26,270 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 83 [2020-08-21 17:28:26,271 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:26,271 INFO L225 Difference]: With dead ends: 166 [2020-08-21 17:28:26,271 INFO L226 Difference]: Without dead ends: 89 [2020-08-21 17:28:26,272 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=112, Invalid=1370, Unknown=0, NotChecked=0, Total=1482 [2020-08-21 17:28:26,273 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2020-08-21 17:28:26,277 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 86. [2020-08-21 17:28:26,277 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2020-08-21 17:28:26,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 88 transitions. [2020-08-21 17:28:26,278 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 88 transitions. Word has length 83 [2020-08-21 17:28:26,278 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:26,278 INFO L479 AbstractCegarLoop]: Abstraction has 86 states and 88 transitions. [2020-08-21 17:28:26,279 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-21 17:28:26,279 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 88 transitions. [2020-08-21 17:28:26,279 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2020-08-21 17:28:26,279 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:26,280 INFO L422 BasicCegarLoop]: trace histogram [35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:26,280 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-21 17:28:26,280 INFO L427 AbstractCegarLoop]: === Iteration 39 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:26,280 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:26,280 INFO L82 PathProgramCache]: Analyzing trace with hash -1023008909, now seen corresponding path program 35 times [2020-08-21 17:28:26,280 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:26,281 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [642568048] [2020-08-21 17:28:26,281 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:26,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:27,543 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:27,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:27,555 INFO L134 CoverageAnalysis]: Checked inductivity of 1227 backedges. 2 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:27,556 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [642568048] [2020-08-21 17:28:27,556 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:27,556 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-21 17:28:27,556 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1230629012] [2020-08-21 17:28:27,556 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-21 17:28:27,557 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:27,557 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-21 17:28:27,557 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=1372, Unknown=0, NotChecked=0, Total=1482 [2020-08-21 17:28:27,557 INFO L87 Difference]: Start difference. First operand 86 states and 88 transitions. Second operand 39 states. [2020-08-21 17:28:29,812 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:29,812 INFO L93 Difference]: Finished difference Result 170 states and 175 transitions. [2020-08-21 17:28:29,813 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-21 17:28:29,813 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 85 [2020-08-21 17:28:29,814 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:29,814 INFO L225 Difference]: With dead ends: 170 [2020-08-21 17:28:29,814 INFO L226 Difference]: Without dead ends: 91 [2020-08-21 17:28:29,815 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=115, Invalid=1445, Unknown=0, NotChecked=0, Total=1560 [2020-08-21 17:28:29,816 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2020-08-21 17:28:29,820 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 88. [2020-08-21 17:28:29,820 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2020-08-21 17:28:29,821 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 90 transitions. [2020-08-21 17:28:29,821 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 90 transitions. Word has length 85 [2020-08-21 17:28:29,821 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:29,821 INFO L479 AbstractCegarLoop]: Abstraction has 88 states and 90 transitions. [2020-08-21 17:28:29,821 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-21 17:28:29,822 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 90 transitions. [2020-08-21 17:28:29,822 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2020-08-21 17:28:29,822 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:29,822 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:29,823 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-21 17:28:29,823 INFO L427 AbstractCegarLoop]: === Iteration 40 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:29,823 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:29,823 INFO L82 PathProgramCache]: Analyzing trace with hash 1137454417, now seen corresponding path program 36 times [2020-08-21 17:28:29,823 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:29,823 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1444879085] [2020-08-21 17:28:29,824 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:29,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:31,225 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:31,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:31,237 INFO L134 CoverageAnalysis]: Checked inductivity of 1298 backedges. 2 proven. 1296 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:31,238 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1444879085] [2020-08-21 17:28:31,238 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:31,238 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-21 17:28:31,238 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1785203768] [2020-08-21 17:28:31,239 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-21 17:28:31,239 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:31,239 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-21 17:28:31,240 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=1447, Unknown=0, NotChecked=0, Total=1560 [2020-08-21 17:28:31,240 INFO L87 Difference]: Start difference. First operand 88 states and 90 transitions. Second operand 40 states. [2020-08-21 17:28:33,601 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:33,602 INFO L93 Difference]: Finished difference Result 174 states and 179 transitions. [2020-08-21 17:28:33,603 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-21 17:28:33,603 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 87 [2020-08-21 17:28:33,604 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:33,605 INFO L225 Difference]: With dead ends: 174 [2020-08-21 17:28:33,605 INFO L226 Difference]: Without dead ends: 93 [2020-08-21 17:28:33,606 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=118, Invalid=1522, Unknown=0, NotChecked=0, Total=1640 [2020-08-21 17:28:33,607 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2020-08-21 17:28:33,611 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 90. [2020-08-21 17:28:33,612 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2020-08-21 17:28:33,612 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 92 transitions. [2020-08-21 17:28:33,613 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 92 transitions. Word has length 87 [2020-08-21 17:28:33,613 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:33,613 INFO L479 AbstractCegarLoop]: Abstraction has 90 states and 92 transitions. [2020-08-21 17:28:33,613 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-21 17:28:33,613 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 92 transitions. [2020-08-21 17:28:33,614 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2020-08-21 17:28:33,614 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:33,614 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:33,614 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-21 17:28:33,615 INFO L427 AbstractCegarLoop]: === Iteration 41 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:33,615 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:33,615 INFO L82 PathProgramCache]: Analyzing trace with hash -1421460561, now seen corresponding path program 37 times [2020-08-21 17:28:33,615 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:33,615 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1305259355] [2020-08-21 17:28:33,615 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:33,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:35,071 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:35,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:35,085 INFO L134 CoverageAnalysis]: Checked inductivity of 1371 backedges. 2 proven. 1369 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:35,085 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1305259355] [2020-08-21 17:28:35,085 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:35,085 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-21 17:28:35,085 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1197424475] [2020-08-21 17:28:35,086 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-21 17:28:35,086 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:35,086 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-21 17:28:35,086 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=1524, Unknown=0, NotChecked=0, Total=1640 [2020-08-21 17:28:35,086 INFO L87 Difference]: Start difference. First operand 90 states and 92 transitions. Second operand 41 states.