/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=SMALLESTAMONGWIDE --traceabstraction.additional.smt.options tolerance=0.1 --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 [2020-08-22 03:09:40,140 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-22 03:09:40,142 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-22 03:09:40,168 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-22 03:09:40,168 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-22 03:09:40,169 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-22 03:09:40,171 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-22 03:09:40,172 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-22 03:09:40,174 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-22 03:09:40,175 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-22 03:09:40,176 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-22 03:09:40,177 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-22 03:09:40,177 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-22 03:09:40,178 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-22 03:09:40,179 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-22 03:09:40,180 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-22 03:09:40,181 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-22 03:09:40,182 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-22 03:09:40,184 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-22 03:09:40,186 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-22 03:09:40,188 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-22 03:09:40,189 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-22 03:09:40,194 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-22 03:09:40,197 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-22 03:09:40,201 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-22 03:09:40,201 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-22 03:09:40,201 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-22 03:09:40,202 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-22 03:09:40,203 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-22 03:09:40,204 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... 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[2020-08-22 03:09:40,213 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-22 03:09:40,214 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-22 03:09:40,215 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-22 03:09:40,216 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 [2020-08-22 03:09:40,264 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-22 03:09:40,264 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-22 03:09:40,265 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-22 03:09:40,266 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-22 03:09:40,266 INFO L138 SettingsManager]: * Use SBE=true [2020-08-22 03:09:40,266 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-22 03:09:40,266 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-22 03:09:40,266 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-22 03:09:40,267 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-22 03:09:40,267 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-22 03:09:40,267 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-22 03:09:40,267 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-22 03:09:40,267 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-22 03:09:40,268 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-22 03:09:40,268 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-22 03:09:40,268 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-22 03:09:40,268 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-22 03:09:40,268 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-22 03:09:40,268 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-22 03:09:40,269 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-22 03:09:40,269 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-22 03:09:40,269 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-22 03:09:40,269 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-22 03:09:40,269 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-22 03:09:40,270 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-22 03:09:40,270 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-22 03:09:40,270 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-22 03:09:40,270 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-22 03:09:40,270 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-22 03:09:40,270 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=SMALLESTAMONGWIDE;tolerance=0.1;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.1;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.1;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.1;log-additional-information=true; [2020-08-22 03:09:40,592 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-22 03:09:40,604 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-22 03:09:40,608 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-22 03:09:40,609 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-22 03:09:40,610 INFO L275 PluginConnector]: CDTParser initialized [2020-08-22 03:09:40,611 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/heavy-2.c [2020-08-22 03:09:40,676 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/4b75a2694/4059d2fcf73246b8bd5ce83d490b26be/FLAGca8f6104a [2020-08-22 03:09:41,077 INFO L306 CDTParser]: Found 1 translation units. [2020-08-22 03:09:41,077 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loops/heavy-2.c [2020-08-22 03:09:41,082 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/4b75a2694/4059d2fcf73246b8bd5ce83d490b26be/FLAGca8f6104a [2020-08-22 03:09:41,441 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/4b75a2694/4059d2fcf73246b8bd5ce83d490b26be [2020-08-22 03:09:41,451 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-22 03:09:41,453 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-22 03:09:41,454 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-22 03:09:41,454 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-22 03:09:41,458 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-22 03:09:41,460 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 03:09:41" (1/1) ... [2020-08-22 03:09:41,464 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1e31edcf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 03:09:41, skipping insertion in model container [2020-08-22 03:09:41,464 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 03:09:41" (1/1) ... [2020-08-22 03:09:41,472 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-22 03:09:41,490 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-22 03:09:41,690 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 03:09:41,730 INFO L203 MainTranslator]: Completed pre-run [2020-08-22 03:09:41,748 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 03:09:41,818 INFO L208 MainTranslator]: Completed translation [2020-08-22 03:09:41,818 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 03:09:41 WrapperNode [2020-08-22 03:09:41,819 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-22 03:09:41,819 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-22 03:09:41,819 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-22 03:09:41,820 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-22 03:09:41,905 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 03:09:41" (1/1) ... [2020-08-22 03:09:41,905 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 03:09:41" (1/1) ... [2020-08-22 03:09:41,912 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 03:09:41" (1/1) ... [2020-08-22 03:09:41,912 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 03:09:41" (1/1) ... [2020-08-22 03:09:41,919 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 03:09:41" (1/1) ... [2020-08-22 03:09:41,923 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 03:09:41" (1/1) ... [2020-08-22 03:09:41,925 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 03:09:41" (1/1) ... [2020-08-22 03:09:41,928 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-22 03:09:41,928 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-22 03:09:41,929 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-22 03:09:41,929 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-22 03:09:41,929 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 03:09:41" (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 [2020-08-22 03:09:41,989 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-22 03:09:41,990 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-22 03:09:41,990 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-22 03:09:41,990 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-22 03:09:41,990 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-22 03:09:41,990 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-22 03:09:41,990 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-22 03:09:41,991 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-22 03:09:41,991 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-22 03:09:41,991 INFO L130 BoogieDeclarations]: Found specification of procedure write~unchecked~int [2020-08-22 03:09:41,991 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-22 03:09:41,991 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-22 03:09:42,225 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-22 03:09:42,226 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-08-22 03:09:42,229 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 03:09:42 BoogieIcfgContainer [2020-08-22 03:09:42,230 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-22 03:09:42,231 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-22 03:09:42,231 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-22 03:09:42,235 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-22 03:09:42,235 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.08 03:09:41" (1/3) ... [2020-08-22 03:09:42,236 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3d8d406d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 03:09:42, skipping insertion in model container [2020-08-22 03:09:42,236 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 03:09:41" (2/3) ... [2020-08-22 03:09:42,237 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3d8d406d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 03:09:42, skipping insertion in model container [2020-08-22 03:09:42,237 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 03:09:42" (3/3) ... [2020-08-22 03:09:42,239 INFO L109 eAbstractionObserver]: Analyzing ICFG heavy-2.c [2020-08-22 03:09:42,255 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-22 03:09:42,267 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-22 03:09:42,288 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-22 03:09:42,316 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-22 03:09:42,316 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-22 03:09:42,317 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-22 03:09:42,317 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-22 03:09:42,317 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-22 03:09:42,317 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-22 03:09:42,317 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-22 03:09:42,317 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-22 03:09:42,337 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states. [2020-08-22 03:09:42,344 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2020-08-22 03:09:42,344 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:09:42,345 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:09:42,346 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:09:42,352 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:09:42,353 INFO L82 PathProgramCache]: Analyzing trace with hash 242978043, now seen corresponding path program 1 times [2020-08-22 03:09:42,361 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:09:42,362 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1611458877] [2020-08-22 03:09:42,362 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:09:42,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:42,578 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:09:42,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:42,598 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:09:42,599 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1611458877] [2020-08-22 03:09:42,602 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 03:09:42,602 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-22 03:09:42,603 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1606571212] [2020-08-22 03:09:42,607 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-22 03:09:42,608 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:09:42,618 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-22 03:09:42,619 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-22 03:09:42,621 INFO L87 Difference]: Start difference. First operand 19 states. Second operand 3 states. [2020-08-22 03:09:42,719 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:09:42,720 INFO L93 Difference]: Finished difference Result 42 states and 61 transitions. [2020-08-22 03:09:42,720 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-22 03:09:42,722 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 9 [2020-08-22 03:09:42,723 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:09:42,732 INFO L225 Difference]: With dead ends: 42 [2020-08-22 03:09:42,732 INFO L226 Difference]: Without dead ends: 23 [2020-08-22 03:09:42,736 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 [2020-08-22 03:09:42,755 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-22 03:09:42,771 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 15. [2020-08-22 03:09:42,773 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-22 03:09:42,775 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2020-08-22 03:09:42,777 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 9 [2020-08-22 03:09:42,777 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:09:42,777 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2020-08-22 03:09:42,777 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-22 03:09:42,778 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2020-08-22 03:09:42,778 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2020-08-22 03:09:42,778 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:09:42,779 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:09:42,779 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-22 03:09:42,779 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:09:42,779 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:09:42,780 INFO L82 PathProgramCache]: Analyzing trace with hash 242949213, now seen corresponding path program 1 times [2020-08-22 03:09:42,780 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:09:42,780 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1102487864] [2020-08-22 03:09:42,780 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:09:42,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:42,886 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:09:42,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:42,906 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:09:42,906 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1102487864] [2020-08-22 03:09:42,907 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 03:09:42,907 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-22 03:09:42,907 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1159856423] [2020-08-22 03:09:42,909 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-22 03:09:42,909 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:09:42,909 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-22 03:09:42,910 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-22 03:09:42,910 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 4 states. [2020-08-22 03:09:43,022 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:09:43,022 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2020-08-22 03:09:43,023 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-22 03:09:43,023 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 9 [2020-08-22 03:09:43,024 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:09:43,025 INFO L225 Difference]: With dead ends: 36 [2020-08-22 03:09:43,025 INFO L226 Difference]: Without dead ends: 33 [2020-08-22 03:09:43,026 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 [2020-08-22 03:09:43,027 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-22 03:09:43,032 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 16. [2020-08-22 03:09:43,032 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-22 03:09:43,033 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2020-08-22 03:09:43,033 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 9 [2020-08-22 03:09:43,034 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:09:43,034 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2020-08-22 03:09:43,034 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-22 03:09:43,034 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2020-08-22 03:09:43,035 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-22 03:09:43,035 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:09:43,035 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:09:43,035 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-22 03:09:43,035 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:09:43,036 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:09:43,036 INFO L82 PathProgramCache]: Analyzing trace with hash 713101374, now seen corresponding path program 1 times [2020-08-22 03:09:43,036 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:09:43,037 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [832935010] [2020-08-22 03:09:43,037 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:09:43,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:43,117 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:09:43,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:43,127 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:09:43,128 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [832935010] [2020-08-22 03:09:43,128 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 03:09:43,128 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-22 03:09:43,129 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1624194560] [2020-08-22 03:09:43,129 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-22 03:09:43,129 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:09:43,130 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-22 03:09:43,130 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-22 03:09:43,130 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand 4 states. [2020-08-22 03:09:43,234 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:09:43,235 INFO L93 Difference]: Finished difference Result 40 states and 50 transitions. [2020-08-22 03:09:43,235 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-22 03:09:43,235 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 12 [2020-08-22 03:09:43,236 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:09:43,237 INFO L225 Difference]: With dead ends: 40 [2020-08-22 03:09:43,237 INFO L226 Difference]: Without dead ends: 31 [2020-08-22 03:09:43,238 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 [2020-08-22 03:09:43,238 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-22 03:09:43,243 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 17. [2020-08-22 03:09:43,243 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-22 03:09:43,244 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2020-08-22 03:09:43,244 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 12 [2020-08-22 03:09:43,244 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:09:43,245 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2020-08-22 03:09:43,245 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-22 03:09:43,245 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2020-08-22 03:09:43,246 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-22 03:09:43,246 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:09:43,246 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:09:43,246 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-22 03:09:43,247 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:09:43,247 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:09:43,248 INFO L82 PathProgramCache]: Analyzing trace with hash -1111837415, now seen corresponding path program 1 times [2020-08-22 03:09:43,248 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:09:43,248 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [829030975] [2020-08-22 03:09:43,248 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:09:43,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:43,307 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:09:43,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:43,316 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:09:43,316 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [829030975] [2020-08-22 03:09:43,317 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 03:09:43,317 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-22 03:09:43,317 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1946257460] [2020-08-22 03:09:43,318 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-22 03:09:43,318 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:09:43,319 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-22 03:09:43,319 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-22 03:09:43,319 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand 4 states. [2020-08-22 03:09:43,409 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:09:43,410 INFO L93 Difference]: Finished difference Result 31 states and 37 transitions. [2020-08-22 03:09:43,410 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-22 03:09:43,410 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 15 [2020-08-22 03:09:43,411 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:09:43,411 INFO L225 Difference]: With dead ends: 31 [2020-08-22 03:09:43,411 INFO L226 Difference]: Without dead ends: 21 [2020-08-22 03:09:43,412 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 [2020-08-22 03:09:43,413 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-22 03:09:43,416 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 18. [2020-08-22 03:09:43,417 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-22 03:09:43,417 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2020-08-22 03:09:43,418 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 15 [2020-08-22 03:09:43,418 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:09:43,418 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2020-08-22 03:09:43,418 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-22 03:09:43,418 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2020-08-22 03:09:43,419 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-22 03:09:43,419 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:09:43,419 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:09:43,420 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-22 03:09:43,420 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:09:43,420 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:09:43,420 INFO L82 PathProgramCache]: Analyzing trace with hash 1672606071, now seen corresponding path program 1 times [2020-08-22 03:09:43,421 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:09:43,421 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1253159579] [2020-08-22 03:09:43,421 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:09:43,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:43,529 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:09:43,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:43,537 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:09:43,538 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1253159579] [2020-08-22 03:09:43,538 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:09:43,538 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-22 03:09:43,538 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1443908190] [2020-08-22 03:09:43,539 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-22 03:09:43,539 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:09:43,539 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-22 03:09:43,540 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-22 03:09:43,540 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 5 states. [2020-08-22 03:09:43,616 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:09:43,616 INFO L93 Difference]: Finished difference Result 34 states and 39 transitions. [2020-08-22 03:09:43,616 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-22 03:09:43,617 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2020-08-22 03:09:43,617 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:09:43,618 INFO L225 Difference]: With dead ends: 34 [2020-08-22 03:09:43,618 INFO L226 Difference]: Without dead ends: 23 [2020-08-22 03:09:43,619 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 [2020-08-22 03:09:43,619 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-22 03:09:43,623 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 20. [2020-08-22 03:09:43,623 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-22 03:09:43,624 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2020-08-22 03:09:43,625 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 17 [2020-08-22 03:09:43,625 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:09:43,625 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2020-08-22 03:09:43,625 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-22 03:09:43,625 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2020-08-22 03:09:43,626 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-22 03:09:43,626 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:09:43,626 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:09:43,627 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-22 03:09:43,627 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:09:43,627 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:09:43,627 INFO L82 PathProgramCache]: Analyzing trace with hash 1758170709, now seen corresponding path program 2 times [2020-08-22 03:09:43,628 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:09:43,628 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1888665139] [2020-08-22 03:09:43,628 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:09:43,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:43,740 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:09:43,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:43,747 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:09:43,748 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1888665139] [2020-08-22 03:09:43,748 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:09:43,748 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-22 03:09:43,748 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [546574746] [2020-08-22 03:09:43,749 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-22 03:09:43,749 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:09:43,750 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-22 03:09:43,750 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-22 03:09:43,750 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand 6 states. [2020-08-22 03:09:43,834 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:09:43,835 INFO L93 Difference]: Finished difference Result 38 states and 43 transitions. [2020-08-22 03:09:43,835 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-22 03:09:43,835 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 19 [2020-08-22 03:09:43,836 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:09:43,836 INFO L225 Difference]: With dead ends: 38 [2020-08-22 03:09:43,836 INFO L226 Difference]: Without dead ends: 25 [2020-08-22 03:09:43,837 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 [2020-08-22 03:09:43,837 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-22 03:09:43,841 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 22. [2020-08-22 03:09:43,842 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-08-22 03:09:43,843 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2020-08-22 03:09:43,843 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 19 [2020-08-22 03:09:43,843 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:09:43,843 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2020-08-22 03:09:43,843 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-22 03:09:43,844 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2020-08-22 03:09:43,844 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-08-22 03:09:43,844 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:09:43,845 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:09:43,845 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-22 03:09:43,845 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:09:43,845 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:09:43,846 INFO L82 PathProgramCache]: Analyzing trace with hash -1913558093, now seen corresponding path program 3 times [2020-08-22 03:09:43,846 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:09:43,846 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1832355863] [2020-08-22 03:09:43,846 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:09:43,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:43,986 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:09:43,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:43,992 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:09:43,993 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1832355863] [2020-08-22 03:09:43,993 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:09:43,993 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-22 03:09:43,993 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [782544868] [2020-08-22 03:09:43,994 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-22 03:09:43,994 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:09:43,994 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-22 03:09:43,995 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-08-22 03:09:43,995 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand 7 states. [2020-08-22 03:09:44,093 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:09:44,093 INFO L93 Difference]: Finished difference Result 42 states and 47 transitions. [2020-08-22 03:09:44,094 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-22 03:09:44,094 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 21 [2020-08-22 03:09:44,094 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:09:44,094 INFO L225 Difference]: With dead ends: 42 [2020-08-22 03:09:44,095 INFO L226 Difference]: Without dead ends: 27 [2020-08-22 03:09:44,095 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 [2020-08-22 03:09:44,096 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-08-22 03:09:44,100 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 24. [2020-08-22 03:09:44,100 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-22 03:09:44,101 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2020-08-22 03:09:44,101 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 21 [2020-08-22 03:09:44,101 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:09:44,101 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2020-08-22 03:09:44,102 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-22 03:09:44,102 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2020-08-22 03:09:44,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-08-22 03:09:44,103 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:09:44,103 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:09:44,103 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-22 03:09:44,103 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:09:44,103 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:09:44,104 INFO L82 PathProgramCache]: Analyzing trace with hash 18180497, now seen corresponding path program 4 times [2020-08-22 03:09:44,104 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:09:44,104 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1088220374] [2020-08-22 03:09:44,104 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:09:44,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:44,292 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:09:44,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:44,300 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 2 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:09:44,300 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1088220374] [2020-08-22 03:09:44,300 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:09:44,301 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-22 03:09:44,301 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [836733872] [2020-08-22 03:09:44,302 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-22 03:09:44,304 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:09:44,304 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-22 03:09:44,305 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-08-22 03:09:44,305 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand 8 states. [2020-08-22 03:09:44,446 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:09:44,447 INFO L93 Difference]: Finished difference Result 46 states and 51 transitions. [2020-08-22 03:09:44,447 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-22 03:09:44,447 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 23 [2020-08-22 03:09:44,448 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:09:44,448 INFO L225 Difference]: With dead ends: 46 [2020-08-22 03:09:44,448 INFO L226 Difference]: Without dead ends: 29 [2020-08-22 03:09:44,449 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 [2020-08-22 03:09:44,450 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-22 03:09:44,457 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 26. [2020-08-22 03:09:44,457 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-22 03:09:44,458 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2020-08-22 03:09:44,458 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 23 [2020-08-22 03:09:44,458 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:09:44,459 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2020-08-22 03:09:44,459 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-22 03:09:44,459 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2020-08-22 03:09:44,459 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-22 03:09:44,460 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:09:44,460 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:09:44,460 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-22 03:09:44,460 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:09:44,461 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:09:44,461 INFO L82 PathProgramCache]: Analyzing trace with hash 993093615, now seen corresponding path program 5 times [2020-08-22 03:09:44,461 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:09:44,461 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [586310467] [2020-08-22 03:09:44,461 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:09:44,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:44,617 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:09:44,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:44,623 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:09:44,623 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [586310467] [2020-08-22 03:09:44,624 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:09:44,624 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-22 03:09:44,624 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1749496602] [2020-08-22 03:09:44,624 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-22 03:09:44,625 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:09:44,625 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-22 03:09:44,625 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2020-08-22 03:09:44,625 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 9 states. [2020-08-22 03:09:44,772 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:09:44,773 INFO L93 Difference]: Finished difference Result 50 states and 55 transitions. [2020-08-22 03:09:44,773 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-22 03:09:44,773 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 25 [2020-08-22 03:09:44,773 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:09:44,774 INFO L225 Difference]: With dead ends: 50 [2020-08-22 03:09:44,774 INFO L226 Difference]: Without dead ends: 31 [2020-08-22 03:09:44,775 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 [2020-08-22 03:09:44,775 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-22 03:09:44,779 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 28. [2020-08-22 03:09:44,780 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-22 03:09:44,780 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2020-08-22 03:09:44,781 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 25 [2020-08-22 03:09:44,781 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:09:44,781 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2020-08-22 03:09:44,781 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-22 03:09:44,781 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2020-08-22 03:09:44,782 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-22 03:09:44,782 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:09:44,782 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:09:44,783 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-22 03:09:44,783 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:09:44,783 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:09:44,783 INFO L82 PathProgramCache]: Analyzing trace with hash 1581729485, now seen corresponding path program 6 times [2020-08-22 03:09:44,784 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:09:44,784 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1071247875] [2020-08-22 03:09:44,784 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:09:44,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:44,949 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:09:44,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:44,955 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 2 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:09:44,956 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1071247875] [2020-08-22 03:09:44,956 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:09:44,956 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-22 03:09:44,956 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [207931110] [2020-08-22 03:09:44,957 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-22 03:09:44,957 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:09:44,957 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-22 03:09:44,958 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2020-08-22 03:09:44,958 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand 10 states. [2020-08-22 03:09:45,200 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:09:45,201 INFO L93 Difference]: Finished difference Result 54 states and 59 transitions. [2020-08-22 03:09:45,202 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-22 03:09:45,202 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-08-22 03:09:45,202 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:09:45,203 INFO L225 Difference]: With dead ends: 54 [2020-08-22 03:09:45,203 INFO L226 Difference]: Without dead ends: 33 [2020-08-22 03:09:45,204 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 [2020-08-22 03:09:45,204 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-22 03:09:45,211 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 30. [2020-08-22 03:09:45,211 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-08-22 03:09:45,212 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2020-08-22 03:09:45,214 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 27 [2020-08-22 03:09:45,214 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:09:45,214 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2020-08-22 03:09:45,214 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-22 03:09:45,215 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2020-08-22 03:09:45,217 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-08-22 03:09:45,218 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:09:45,218 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:09:45,218 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-22 03:09:45,218 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:09:45,218 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:09:45,219 INFO L82 PathProgramCache]: Analyzing trace with hash 325117483, now seen corresponding path program 7 times [2020-08-22 03:09:45,219 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:09:45,219 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2087120428] [2020-08-22 03:09:45,219 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:09:45,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:45,413 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:09:45,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:45,419 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 2 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:09:45,419 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2087120428] [2020-08-22 03:09:45,419 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:09:45,420 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-22 03:09:45,420 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [584328823] [2020-08-22 03:09:45,420 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-22 03:09:45,420 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:09:45,421 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-22 03:09:45,421 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2020-08-22 03:09:45,421 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand 11 states. [2020-08-22 03:09:45,635 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:09:45,636 INFO L93 Difference]: Finished difference Result 58 states and 63 transitions. [2020-08-22 03:09:45,636 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-22 03:09:45,636 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 29 [2020-08-22 03:09:45,637 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:09:45,637 INFO L225 Difference]: With dead ends: 58 [2020-08-22 03:09:45,637 INFO L226 Difference]: Without dead ends: 35 [2020-08-22 03:09:45,638 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 [2020-08-22 03:09:45,638 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-22 03:09:45,643 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 32. [2020-08-22 03:09:45,643 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-08-22 03:09:45,644 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2020-08-22 03:09:45,644 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 29 [2020-08-22 03:09:45,645 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:09:45,645 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2020-08-22 03:09:45,645 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-22 03:09:45,645 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2020-08-22 03:09:45,646 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-22 03:09:45,646 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:09:45,646 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:09:45,646 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-22 03:09:45,646 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:09:45,647 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:09:45,647 INFO L82 PathProgramCache]: Analyzing trace with hash -393206263, now seen corresponding path program 8 times [2020-08-22 03:09:45,647 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:09:45,647 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1384454674] [2020-08-22 03:09:45,648 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:09:45,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:45,841 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:09:45,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:45,849 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 2 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:09:45,849 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1384454674] [2020-08-22 03:09:45,850 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:09:45,850 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-22 03:09:45,850 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1092662399] [2020-08-22 03:09:45,851 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-22 03:09:45,851 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:09:45,851 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-22 03:09:45,851 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2020-08-22 03:09:45,852 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand 12 states. [2020-08-22 03:09:46,093 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:09:46,093 INFO L93 Difference]: Finished difference Result 62 states and 67 transitions. [2020-08-22 03:09:46,094 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-22 03:09:46,094 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 31 [2020-08-22 03:09:46,094 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:09:46,095 INFO L225 Difference]: With dead ends: 62 [2020-08-22 03:09:46,095 INFO L226 Difference]: Without dead ends: 37 [2020-08-22 03:09:46,096 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 [2020-08-22 03:09:46,097 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-22 03:09:46,104 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 34. [2020-08-22 03:09:46,104 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-22 03:09:46,105 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 36 transitions. [2020-08-22 03:09:46,105 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 36 transitions. Word has length 31 [2020-08-22 03:09:46,105 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:09:46,105 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 36 transitions. [2020-08-22 03:09:46,106 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-22 03:09:46,106 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 36 transitions. [2020-08-22 03:09:46,110 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-22 03:09:46,110 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:09:46,110 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:09:46,111 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-22 03:09:46,111 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:09:46,111 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:09:46,111 INFO L82 PathProgramCache]: Analyzing trace with hash 787408487, now seen corresponding path program 9 times [2020-08-22 03:09:46,113 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:09:46,113 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [797175397] [2020-08-22 03:09:46,113 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:09:46,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:46,377 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:09:46,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:46,384 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 2 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:09:46,385 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [797175397] [2020-08-22 03:09:46,385 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:09:46,385 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-22 03:09:46,385 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [835314074] [2020-08-22 03:09:46,386 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-22 03:09:46,386 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:09:46,386 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-22 03:09:46,387 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2020-08-22 03:09:46,387 INFO L87 Difference]: Start difference. First operand 34 states and 36 transitions. Second operand 13 states. [2020-08-22 03:09:46,663 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:09:46,664 INFO L93 Difference]: Finished difference Result 66 states and 71 transitions. [2020-08-22 03:09:46,664 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-22 03:09:46,664 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 33 [2020-08-22 03:09:46,665 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:09:46,665 INFO L225 Difference]: With dead ends: 66 [2020-08-22 03:09:46,665 INFO L226 Difference]: Without dead ends: 39 [2020-08-22 03:09:46,666 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 [2020-08-22 03:09:46,667 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-22 03:09:46,671 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 36. [2020-08-22 03:09:46,671 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-22 03:09:46,672 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2020-08-22 03:09:46,672 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 33 [2020-08-22 03:09:46,673 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:09:46,673 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2020-08-22 03:09:46,673 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-22 03:09:46,673 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2020-08-22 03:09:46,673 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-08-22 03:09:46,674 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:09:46,674 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:09:46,674 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-22 03:09:46,674 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:09:46,674 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:09:46,675 INFO L82 PathProgramCache]: Analyzing trace with hash 1486817093, now seen corresponding path program 10 times [2020-08-22 03:09:46,675 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:09:46,675 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1481554731] [2020-08-22 03:09:46,675 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:09:46,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:46,912 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:09:46,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:46,920 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 2 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:09:46,920 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1481554731] [2020-08-22 03:09:46,921 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:09:46,921 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-22 03:09:46,921 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [968413698] [2020-08-22 03:09:46,921 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-22 03:09:46,922 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:09:46,922 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-22 03:09:46,923 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2020-08-22 03:09:46,924 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand 14 states. [2020-08-22 03:09:47,224 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:09:47,224 INFO L93 Difference]: Finished difference Result 70 states and 75 transitions. [2020-08-22 03:09:47,224 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-22 03:09:47,225 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 35 [2020-08-22 03:09:47,225 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:09:47,225 INFO L225 Difference]: With dead ends: 70 [2020-08-22 03:09:47,226 INFO L226 Difference]: Without dead ends: 41 [2020-08-22 03:09:47,226 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 [2020-08-22 03:09:47,227 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-22 03:09:47,233 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 38. [2020-08-22 03:09:47,233 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-22 03:09:47,234 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2020-08-22 03:09:47,234 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 35 [2020-08-22 03:09:47,234 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:09:47,234 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2020-08-22 03:09:47,234 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-22 03:09:47,235 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2020-08-22 03:09:47,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-22 03:09:47,235 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:09:47,235 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:09:47,236 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-22 03:09:47,236 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:09:47,236 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:09:47,236 INFO L82 PathProgramCache]: Analyzing trace with hash -691378013, now seen corresponding path program 11 times [2020-08-22 03:09:47,236 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:09:47,237 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1149174098] [2020-08-22 03:09:47,237 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:09:47,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:47,473 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:09:47,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:47,482 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 2 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:09:47,482 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1149174098] [2020-08-22 03:09:47,483 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:09:47,483 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-22 03:09:47,483 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [946435206] [2020-08-22 03:09:47,484 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-22 03:09:47,484 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:09:47,484 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-22 03:09:47,485 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=172, Unknown=0, NotChecked=0, Total=210 [2020-08-22 03:09:47,485 INFO L87 Difference]: Start difference. First operand 38 states and 40 transitions. Second operand 15 states. [2020-08-22 03:09:47,860 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:09:47,860 INFO L93 Difference]: Finished difference Result 74 states and 79 transitions. [2020-08-22 03:09:47,860 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-22 03:09:47,861 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 37 [2020-08-22 03:09:47,861 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:09:47,861 INFO L225 Difference]: With dead ends: 74 [2020-08-22 03:09:47,861 INFO L226 Difference]: Without dead ends: 43 [2020-08-22 03:09:47,862 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 [2020-08-22 03:09:47,863 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-22 03:09:47,867 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 40. [2020-08-22 03:09:47,867 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-22 03:09:47,868 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 42 transitions. [2020-08-22 03:09:47,868 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 42 transitions. Word has length 37 [2020-08-22 03:09:47,869 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:09:47,869 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 42 transitions. [2020-08-22 03:09:47,869 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-22 03:09:47,869 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 42 transitions. [2020-08-22 03:09:47,869 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-22 03:09:47,870 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:09:47,870 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:09:47,870 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-22 03:09:47,870 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:09:47,870 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:09:47,870 INFO L82 PathProgramCache]: Analyzing trace with hash 2007165569, now seen corresponding path program 12 times [2020-08-22 03:09:47,871 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:09:47,871 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [80155844] [2020-08-22 03:09:47,871 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:09:47,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:48,119 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:09:48,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:48,125 INFO L134 CoverageAnalysis]: Checked inductivity of 146 backedges. 2 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:09:48,126 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [80155844] [2020-08-22 03:09:48,126 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:09:48,126 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-22 03:09:48,126 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1657317348] [2020-08-22 03:09:48,127 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-22 03:09:48,127 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:09:48,127 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-22 03:09:48,128 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2020-08-22 03:09:48,128 INFO L87 Difference]: Start difference. First operand 40 states and 42 transitions. Second operand 16 states. [2020-08-22 03:09:48,536 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:09:48,536 INFO L93 Difference]: Finished difference Result 78 states and 83 transitions. [2020-08-22 03:09:48,537 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-22 03:09:48,537 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 39 [2020-08-22 03:09:48,538 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:09:48,538 INFO L225 Difference]: With dead ends: 78 [2020-08-22 03:09:48,539 INFO L226 Difference]: Without dead ends: 45 [2020-08-22 03:09:48,540 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 [2020-08-22 03:09:48,540 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-08-22 03:09:48,544 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 42. [2020-08-22 03:09:48,545 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-22 03:09:48,545 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 44 transitions. [2020-08-22 03:09:48,546 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 44 transitions. Word has length 39 [2020-08-22 03:09:48,546 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:09:48,546 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 44 transitions. [2020-08-22 03:09:48,546 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-22 03:09:48,546 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 44 transitions. [2020-08-22 03:09:48,547 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-22 03:09:48,547 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:09:48,547 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:09:48,547 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-22 03:09:48,547 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:09:48,548 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:09:48,548 INFO L82 PathProgramCache]: Analyzing trace with hash 1147301087, now seen corresponding path program 13 times [2020-08-22 03:09:48,548 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:09:48,548 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1024291153] [2020-08-22 03:09:48,549 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:09:48,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:48,821 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:09:48,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:48,828 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 2 proven. 169 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:09:48,828 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1024291153] [2020-08-22 03:09:48,829 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:09:48,829 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-22 03:09:48,829 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [919520431] [2020-08-22 03:09:48,829 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-22 03:09:48,830 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:09:48,830 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-22 03:09:48,830 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2020-08-22 03:09:48,830 INFO L87 Difference]: Start difference. First operand 42 states and 44 transitions. Second operand 17 states. [2020-08-22 03:09:49,218 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:09:49,218 INFO L93 Difference]: Finished difference Result 82 states and 87 transitions. [2020-08-22 03:09:49,218 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-22 03:09:49,219 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 41 [2020-08-22 03:09:49,219 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:09:49,219 INFO L225 Difference]: With dead ends: 82 [2020-08-22 03:09:49,219 INFO L226 Difference]: Without dead ends: 47 [2020-08-22 03:09:49,220 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 [2020-08-22 03:09:49,220 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-22 03:09:49,224 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 44. [2020-08-22 03:09:49,225 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-22 03:09:49,225 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 46 transitions. [2020-08-22 03:09:49,225 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 46 transitions. Word has length 41 [2020-08-22 03:09:49,226 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:09:49,226 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 46 transitions. [2020-08-22 03:09:49,226 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-22 03:09:49,226 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 46 transitions. [2020-08-22 03:09:49,227 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-22 03:09:49,227 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:09:49,227 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:09:49,227 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-22 03:09:49,227 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:09:49,227 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:09:49,228 INFO L82 PathProgramCache]: Analyzing trace with hash -548745283, now seen corresponding path program 14 times [2020-08-22 03:09:49,228 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:09:49,228 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1698104300] [2020-08-22 03:09:49,228 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:09:49,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:49,521 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:09:49,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:49,528 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 2 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:09:49,528 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1698104300] [2020-08-22 03:09:49,528 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:09:49,534 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-22 03:09:49,535 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2144392006] [2020-08-22 03:09:49,535 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-22 03:09:49,535 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:09:49,536 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-22 03:09:49,537 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=259, Unknown=0, NotChecked=0, Total=306 [2020-08-22 03:09:49,538 INFO L87 Difference]: Start difference. First operand 44 states and 46 transitions. Second operand 18 states. [2020-08-22 03:09:50,033 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:09:50,033 INFO L93 Difference]: Finished difference Result 86 states and 91 transitions. [2020-08-22 03:09:50,034 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-22 03:09:50,034 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 43 [2020-08-22 03:09:50,034 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:09:50,034 INFO L225 Difference]: With dead ends: 86 [2020-08-22 03:09:50,035 INFO L226 Difference]: Without dead ends: 49 [2020-08-22 03:09:50,035 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=52, Invalid=290, Unknown=0, NotChecked=0, Total=342 [2020-08-22 03:09:50,036 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-22 03:09:50,053 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 46. [2020-08-22 03:09:50,053 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-22 03:09:50,054 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 48 transitions. [2020-08-22 03:09:50,054 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 48 transitions. Word has length 43 [2020-08-22 03:09:50,054 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:09:50,054 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 48 transitions. [2020-08-22 03:09:50,054 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-22 03:09:50,054 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 48 transitions. [2020-08-22 03:09:50,055 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-08-22 03:09:50,055 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:09:50,055 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:09:50,055 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-22 03:09:50,055 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:09:50,056 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:09:50,056 INFO L82 PathProgramCache]: Analyzing trace with hash 1638265627, now seen corresponding path program 15 times [2020-08-22 03:09:50,056 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:09:50,056 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1041490280] [2020-08-22 03:09:50,056 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:09:50,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:50,375 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:09:50,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:50,382 INFO L134 CoverageAnalysis]: Checked inductivity of 227 backedges. 2 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:09:50,382 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1041490280] [2020-08-22 03:09:50,382 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:09:50,382 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-22 03:09:50,383 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [598471033] [2020-08-22 03:09:50,385 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-22 03:09:50,385 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:09:50,386 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-22 03:09:50,386 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=292, Unknown=0, NotChecked=0, Total=342 [2020-08-22 03:09:50,386 INFO L87 Difference]: Start difference. First operand 46 states and 48 transitions. Second operand 19 states. [2020-08-22 03:09:50,918 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:09:50,918 INFO L93 Difference]: Finished difference Result 90 states and 95 transitions. [2020-08-22 03:09:50,919 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-22 03:09:50,919 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 45 [2020-08-22 03:09:50,919 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:09:50,920 INFO L225 Difference]: With dead ends: 90 [2020-08-22 03:09:50,920 INFO L226 Difference]: Without dead ends: 51 [2020-08-22 03:09:50,921 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=55, Invalid=325, Unknown=0, NotChecked=0, Total=380 [2020-08-22 03:09:50,921 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-08-22 03:09:50,928 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 48. [2020-08-22 03:09:50,928 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-22 03:09:50,928 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 50 transitions. [2020-08-22 03:09:50,928 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 50 transitions. Word has length 45 [2020-08-22 03:09:50,929 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:09:50,930 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 50 transitions. [2020-08-22 03:09:50,930 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-22 03:09:50,930 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 50 transitions. [2020-08-22 03:09:50,932 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-08-22 03:09:50,932 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:09:50,932 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:09:50,932 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-22 03:09:50,933 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:09:50,933 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:09:50,933 INFO L82 PathProgramCache]: Analyzing trace with hash -1178224903, now seen corresponding path program 16 times [2020-08-22 03:09:50,933 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:09:50,933 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1496713578] [2020-08-22 03:09:50,933 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:09:50,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:51,344 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:09:51,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:51,352 INFO L134 CoverageAnalysis]: Checked inductivity of 258 backedges. 2 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:09:51,352 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1496713578] [2020-08-22 03:09:51,353 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:09:51,353 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-22 03:09:51,353 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2069496992] [2020-08-22 03:09:51,354 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-22 03:09:51,354 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:09:51,354 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-22 03:09:51,354 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=327, Unknown=0, NotChecked=0, Total=380 [2020-08-22 03:09:51,354 INFO L87 Difference]: Start difference. First operand 48 states and 50 transitions. Second operand 20 states. [2020-08-22 03:09:51,943 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:09:51,943 INFO L93 Difference]: Finished difference Result 94 states and 99 transitions. [2020-08-22 03:09:51,943 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-22 03:09:51,943 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 47 [2020-08-22 03:09:51,944 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:09:51,944 INFO L225 Difference]: With dead ends: 94 [2020-08-22 03:09:51,944 INFO L226 Difference]: Without dead ends: 53 [2020-08-22 03:09:51,945 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 [2020-08-22 03:09:51,945 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-08-22 03:09:51,949 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 50. [2020-08-22 03:09:51,949 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-08-22 03:09:51,949 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 52 transitions. [2020-08-22 03:09:51,950 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 52 transitions. Word has length 47 [2020-08-22 03:09:51,950 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:09:51,950 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 52 transitions. [2020-08-22 03:09:51,950 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-22 03:09:51,950 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 52 transitions. [2020-08-22 03:09:51,951 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-08-22 03:09:51,951 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:09:51,951 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:09:51,951 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-22 03:09:51,951 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:09:51,952 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:09:51,952 INFO L82 PathProgramCache]: Analyzing trace with hash -1996227753, now seen corresponding path program 17 times [2020-08-22 03:09:51,952 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:09:51,952 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1262578257] [2020-08-22 03:09:51,952 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:09:51,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:52,346 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:09:52,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:52,351 INFO L134 CoverageAnalysis]: Checked inductivity of 291 backedges. 2 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:09:52,351 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1262578257] [2020-08-22 03:09:52,352 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:09:52,352 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-22 03:09:52,352 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [446053085] [2020-08-22 03:09:52,352 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-22 03:09:52,352 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:09:52,353 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-22 03:09:52,353 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=364, Unknown=0, NotChecked=0, Total=420 [2020-08-22 03:09:52,353 INFO L87 Difference]: Start difference. First operand 50 states and 52 transitions. Second operand 21 states. [2020-08-22 03:09:53,012 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:09:53,012 INFO L93 Difference]: Finished difference Result 98 states and 103 transitions. [2020-08-22 03:09:53,013 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-22 03:09:53,013 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 49 [2020-08-22 03:09:53,013 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:09:53,014 INFO L225 Difference]: With dead ends: 98 [2020-08-22 03:09:53,014 INFO L226 Difference]: Without dead ends: 55 [2020-08-22 03:09:53,015 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 [2020-08-22 03:09:53,015 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-08-22 03:09:53,024 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 52. [2020-08-22 03:09:53,024 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-08-22 03:09:53,025 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 54 transitions. [2020-08-22 03:09:53,025 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 54 transitions. Word has length 49 [2020-08-22 03:09:53,025 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:09:53,028 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 54 transitions. [2020-08-22 03:09:53,029 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-22 03:09:53,029 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 54 transitions. [2020-08-22 03:09:53,029 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-08-22 03:09:53,029 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:09:53,030 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:09:53,030 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-22 03:09:53,030 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:09:53,031 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:09:53,031 INFO L82 PathProgramCache]: Analyzing trace with hash -2117951435, now seen corresponding path program 18 times [2020-08-22 03:09:53,032 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:09:53,033 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [162529726] [2020-08-22 03:09:53,033 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:09:53,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:53,484 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:09:53,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:53,491 INFO L134 CoverageAnalysis]: Checked inductivity of 326 backedges. 2 proven. 324 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:09:53,492 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [162529726] [2020-08-22 03:09:53,492 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:09:53,492 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-22 03:09:53,492 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1040356713] [2020-08-22 03:09:53,493 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-22 03:09:53,493 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:09:53,493 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-22 03:09:53,494 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=403, Unknown=0, NotChecked=0, Total=462 [2020-08-22 03:09:53,494 INFO L87 Difference]: Start difference. First operand 52 states and 54 transitions. Second operand 22 states. [2020-08-22 03:09:54,172 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:09:54,173 INFO L93 Difference]: Finished difference Result 102 states and 107 transitions. [2020-08-22 03:09:54,175 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-22 03:09:54,176 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 51 [2020-08-22 03:09:54,176 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:09:54,176 INFO L225 Difference]: With dead ends: 102 [2020-08-22 03:09:54,177 INFO L226 Difference]: Without dead ends: 57 [2020-08-22 03:09:54,177 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 [2020-08-22 03:09:54,178 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-08-22 03:09:54,182 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 54. [2020-08-22 03:09:54,182 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-08-22 03:09:54,182 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 56 transitions. [2020-08-22 03:09:54,183 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 56 transitions. Word has length 51 [2020-08-22 03:09:54,183 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:09:54,183 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 56 transitions. [2020-08-22 03:09:54,183 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-22 03:09:54,183 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 56 transitions. [2020-08-22 03:09:54,183 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-08-22 03:09:54,184 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:09:54,184 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:09:54,184 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-22 03:09:54,184 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:09:54,184 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:09:54,184 INFO L82 PathProgramCache]: Analyzing trace with hash 1164674451, now seen corresponding path program 19 times [2020-08-22 03:09:54,185 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:09:54,185 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1440520978] [2020-08-22 03:09:54,185 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:09:54,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:54,668 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:09:54,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:54,676 INFO L134 CoverageAnalysis]: Checked inductivity of 363 backedges. 2 proven. 361 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:09:54,676 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1440520978] [2020-08-22 03:09:54,677 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:09:54,677 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-22 03:09:54,677 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [850119327] [2020-08-22 03:09:54,677 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-22 03:09:54,677 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:09:54,678 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-22 03:09:54,678 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=444, Unknown=0, NotChecked=0, Total=506 [2020-08-22 03:09:54,678 INFO L87 Difference]: Start difference. First operand 54 states and 56 transitions. Second operand 23 states. [2020-08-22 03:09:55,413 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:09:55,413 INFO L93 Difference]: Finished difference Result 106 states and 111 transitions. [2020-08-22 03:09:55,420 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-22 03:09:55,420 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 53 [2020-08-22 03:09:55,421 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:09:55,421 INFO L225 Difference]: With dead ends: 106 [2020-08-22 03:09:55,421 INFO L226 Difference]: Without dead ends: 59 [2020-08-22 03:09:55,422 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 [2020-08-22 03:09:55,423 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-08-22 03:09:55,426 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 56. [2020-08-22 03:09:55,427 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-08-22 03:09:55,427 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 58 transitions. [2020-08-22 03:09:55,427 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 58 transitions. Word has length 53 [2020-08-22 03:09:55,428 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:09:55,428 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 58 transitions. [2020-08-22 03:09:55,428 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-22 03:09:55,428 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 58 transitions. [2020-08-22 03:09:55,428 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-08-22 03:09:55,428 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:09:55,429 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:09:55,429 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-22 03:09:55,429 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:09:55,430 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:09:55,430 INFO L82 PathProgramCache]: Analyzing trace with hash -1032811663, now seen corresponding path program 20 times [2020-08-22 03:09:55,431 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:09:55,431 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1738888525] [2020-08-22 03:09:55,431 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:09:55,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:55,940 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:09:55,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:55,948 INFO L134 CoverageAnalysis]: Checked inductivity of 402 backedges. 2 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:09:55,948 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1738888525] [2020-08-22 03:09:55,948 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:09:55,948 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-22 03:09:55,948 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1762032207] [2020-08-22 03:09:55,949 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-22 03:09:55,949 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:09:55,949 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-22 03:09:55,949 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=487, Unknown=0, NotChecked=0, Total=552 [2020-08-22 03:09:55,949 INFO L87 Difference]: Start difference. First operand 56 states and 58 transitions. Second operand 24 states. [2020-08-22 03:09:56,689 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:09:56,690 INFO L93 Difference]: Finished difference Result 110 states and 115 transitions. [2020-08-22 03:09:56,690 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-22 03:09:56,691 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 55 [2020-08-22 03:09:56,691 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:09:56,691 INFO L225 Difference]: With dead ends: 110 [2020-08-22 03:09:56,691 INFO L226 Difference]: Without dead ends: 61 [2020-08-22 03:09:56,692 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 [2020-08-22 03:09:56,693 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-08-22 03:09:56,696 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 58. [2020-08-22 03:09:56,696 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-08-22 03:09:56,697 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 60 transitions. [2020-08-22 03:09:56,697 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 60 transitions. Word has length 55 [2020-08-22 03:09:56,697 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:09:56,697 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 60 transitions. [2020-08-22 03:09:56,697 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-22 03:09:56,698 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 60 transitions. [2020-08-22 03:09:56,698 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-08-22 03:09:56,698 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:09:56,698 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:09:56,698 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-22 03:09:56,699 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:09:56,699 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:09:56,699 INFO L82 PathProgramCache]: Analyzing trace with hash 306942415, now seen corresponding path program 21 times [2020-08-22 03:09:56,699 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:09:56,699 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [499475074] [2020-08-22 03:09:56,700 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:09:56,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:57,234 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:09:57,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:57,244 INFO L134 CoverageAnalysis]: Checked inductivity of 443 backedges. 2 proven. 441 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:09:57,244 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [499475074] [2020-08-22 03:09:57,244 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:09:57,245 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-22 03:09:57,245 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1746600120] [2020-08-22 03:09:57,245 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-22 03:09:57,245 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:09:57,245 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-22 03:09:57,246 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=532, Unknown=0, NotChecked=0, Total=600 [2020-08-22 03:09:57,246 INFO L87 Difference]: Start difference. First operand 58 states and 60 transitions. Second operand 25 states. [2020-08-22 03:09:58,095 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:09:58,095 INFO L93 Difference]: Finished difference Result 114 states and 119 transitions. [2020-08-22 03:09:58,096 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-22 03:09:58,096 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 57 [2020-08-22 03:09:58,096 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:09:58,097 INFO L225 Difference]: With dead ends: 114 [2020-08-22 03:09:58,097 INFO L226 Difference]: Without dead ends: 63 [2020-08-22 03:09:58,097 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 [2020-08-22 03:09:58,098 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-08-22 03:09:58,102 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 60. [2020-08-22 03:09:58,102 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-08-22 03:09:58,102 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 62 transitions. [2020-08-22 03:09:58,102 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 62 transitions. Word has length 57 [2020-08-22 03:09:58,103 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:09:58,103 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 62 transitions. [2020-08-22 03:09:58,103 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-22 03:09:58,103 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 62 transitions. [2020-08-22 03:09:58,103 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2020-08-22 03:09:58,103 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:09:58,103 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:09:58,104 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-22 03:09:58,104 INFO L427 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:09:58,104 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:09:58,104 INFO L82 PathProgramCache]: Analyzing trace with hash -679577427, now seen corresponding path program 22 times [2020-08-22 03:09:58,104 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:09:58,104 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [958699428] [2020-08-22 03:09:58,105 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:09:58,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:58,700 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:09:58,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:58,707 INFO L134 CoverageAnalysis]: Checked inductivity of 486 backedges. 2 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:09:58,708 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [958699428] [2020-08-22 03:09:58,708 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:09:58,708 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-22 03:09:58,708 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [582901543] [2020-08-22 03:09:58,709 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-22 03:09:58,709 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:09:58,709 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-22 03:09:58,709 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=579, Unknown=0, NotChecked=0, Total=650 [2020-08-22 03:09:58,710 INFO L87 Difference]: Start difference. First operand 60 states and 62 transitions. Second operand 26 states. [2020-08-22 03:09:59,630 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:09:59,630 INFO L93 Difference]: Finished difference Result 118 states and 123 transitions. [2020-08-22 03:09:59,632 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-22 03:09:59,632 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 59 [2020-08-22 03:09:59,632 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:09:59,633 INFO L225 Difference]: With dead ends: 118 [2020-08-22 03:09:59,633 INFO L226 Difference]: Without dead ends: 65 [2020-08-22 03:09:59,633 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 [2020-08-22 03:09:59,634 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2020-08-22 03:09:59,637 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 62. [2020-08-22 03:09:59,638 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2020-08-22 03:09:59,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 64 transitions. [2020-08-22 03:09:59,638 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 64 transitions. Word has length 59 [2020-08-22 03:09:59,638 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:09:59,639 INFO L479 AbstractCegarLoop]: Abstraction has 62 states and 64 transitions. [2020-08-22 03:09:59,639 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-22 03:09:59,639 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 64 transitions. [2020-08-22 03:09:59,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2020-08-22 03:09:59,639 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:09:59,639 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:09:59,640 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-22 03:09:59,640 INFO L427 AbstractCegarLoop]: === Iteration 27 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:09:59,640 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:09:59,640 INFO L82 PathProgramCache]: Analyzing trace with hash 462626827, now seen corresponding path program 23 times [2020-08-22 03:09:59,640 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:09:59,641 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [937032264] [2020-08-22 03:09:59,641 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:09:59,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:00,247 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:10:00,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:00,256 INFO L134 CoverageAnalysis]: Checked inductivity of 531 backedges. 2 proven. 529 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:10:00,257 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [937032264] [2020-08-22 03:10:00,257 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:10:00,257 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-22 03:10:00,258 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1387486001] [2020-08-22 03:10:00,258 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-22 03:10:00,258 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:10:00,258 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-22 03:10:00,259 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=628, Unknown=0, NotChecked=0, Total=702 [2020-08-22 03:10:00,259 INFO L87 Difference]: Start difference. First operand 62 states and 64 transitions. Second operand 27 states. [2020-08-22 03:10:01,535 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:10:01,535 INFO L93 Difference]: Finished difference Result 122 states and 127 transitions. [2020-08-22 03:10:01,538 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-22 03:10:01,538 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 61 [2020-08-22 03:10:01,538 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:10:01,539 INFO L225 Difference]: With dead ends: 122 [2020-08-22 03:10:01,539 INFO L226 Difference]: Without dead ends: 67 [2020-08-22 03:10:01,539 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=79, Invalid=677, Unknown=0, NotChecked=0, Total=756 [2020-08-22 03:10:01,539 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2020-08-22 03:10:01,543 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 64. [2020-08-22 03:10:01,543 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-08-22 03:10:01,543 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 66 transitions. [2020-08-22 03:10:01,544 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 66 transitions. Word has length 61 [2020-08-22 03:10:01,544 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:10:01,544 INFO L479 AbstractCegarLoop]: Abstraction has 64 states and 66 transitions. [2020-08-22 03:10:01,544 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-22 03:10:01,544 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 66 transitions. [2020-08-22 03:10:01,545 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2020-08-22 03:10:01,545 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:10:01,545 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:10:01,545 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-22 03:10:01,545 INFO L427 AbstractCegarLoop]: === Iteration 28 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:10:01,545 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:10:01,546 INFO L82 PathProgramCache]: Analyzing trace with hash -1390712855, now seen corresponding path program 24 times [2020-08-22 03:10:01,546 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:10:01,546 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1311304784] [2020-08-22 03:10:01,546 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:10:01,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:02,187 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:10:02,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:02,195 INFO L134 CoverageAnalysis]: Checked inductivity of 578 backedges. 2 proven. 576 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:10:02,196 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1311304784] [2020-08-22 03:10:02,196 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:10:02,196 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-22 03:10:02,196 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [267382711] [2020-08-22 03:10:02,196 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-22 03:10:02,197 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:10:02,197 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-22 03:10:02,197 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=679, Unknown=0, NotChecked=0, Total=756 [2020-08-22 03:10:02,197 INFO L87 Difference]: Start difference. First operand 64 states and 66 transitions. Second operand 28 states. [2020-08-22 03:10:03,437 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:10:03,438 INFO L93 Difference]: Finished difference Result 126 states and 131 transitions. [2020-08-22 03:10:03,438 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-22 03:10:03,438 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 63 [2020-08-22 03:10:03,439 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:10:03,440 INFO L225 Difference]: With dead ends: 126 [2020-08-22 03:10:03,440 INFO L226 Difference]: Without dead ends: 69 [2020-08-22 03:10:03,441 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 [2020-08-22 03:10:03,441 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2020-08-22 03:10:03,444 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 66. [2020-08-22 03:10:03,444 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-08-22 03:10:03,445 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 68 transitions. [2020-08-22 03:10:03,445 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 68 transitions. Word has length 63 [2020-08-22 03:10:03,445 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:10:03,445 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 68 transitions. [2020-08-22 03:10:03,445 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-22 03:10:03,446 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 68 transitions. [2020-08-22 03:10:03,446 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-08-22 03:10:03,446 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:10:03,446 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:10:03,446 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-22 03:10:03,447 INFO L427 AbstractCegarLoop]: === Iteration 29 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:10:03,447 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:10:03,447 INFO L82 PathProgramCache]: Analyzing trace with hash -38719417, now seen corresponding path program 25 times [2020-08-22 03:10:03,447 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:10:03,447 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [109124883] [2020-08-22 03:10:03,447 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:10:03,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:04,159 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:10:04,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:04,169 INFO L134 CoverageAnalysis]: Checked inductivity of 627 backedges. 2 proven. 625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:10:04,169 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [109124883] [2020-08-22 03:10:04,169 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:10:04,170 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-22 03:10:04,170 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [867696055] [2020-08-22 03:10:04,171 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-22 03:10:04,171 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:10:04,171 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-22 03:10:04,172 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=732, Unknown=0, NotChecked=0, Total=812 [2020-08-22 03:10:04,172 INFO L87 Difference]: Start difference. First operand 66 states and 68 transitions. Second operand 29 states. [2020-08-22 03:10:05,488 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:10:05,488 INFO L93 Difference]: Finished difference Result 130 states and 135 transitions. [2020-08-22 03:10:05,491 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-22 03:10:05,491 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 65 [2020-08-22 03:10:05,491 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:10:05,492 INFO L225 Difference]: With dead ends: 130 [2020-08-22 03:10:05,492 INFO L226 Difference]: Without dead ends: 71 [2020-08-22 03:10:05,493 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 [2020-08-22 03:10:05,493 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2020-08-22 03:10:05,497 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 68. [2020-08-22 03:10:05,497 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2020-08-22 03:10:05,498 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 70 transitions. [2020-08-22 03:10:05,498 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 70 transitions. Word has length 65 [2020-08-22 03:10:05,498 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:10:05,498 INFO L479 AbstractCegarLoop]: Abstraction has 68 states and 70 transitions. [2020-08-22 03:10:05,498 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-22 03:10:05,499 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 70 transitions. [2020-08-22 03:10:05,499 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-08-22 03:10:05,499 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:10:05,499 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:10:05,500 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-22 03:10:05,500 INFO L427 AbstractCegarLoop]: === Iteration 30 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:10:05,500 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:10:05,500 INFO L82 PathProgramCache]: Analyzing trace with hash 2146851109, now seen corresponding path program 26 times [2020-08-22 03:10:05,500 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:10:05,500 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1509053120] [2020-08-22 03:10:05,501 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:10:05,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:06,440 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:10:06,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:06,452 INFO L134 CoverageAnalysis]: Checked inductivity of 678 backedges. 2 proven. 676 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:10:06,452 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1509053120] [2020-08-22 03:10:06,452 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:10:06,453 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-22 03:10:06,453 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1995200479] [2020-08-22 03:10:06,453 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-22 03:10:06,453 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:10:06,454 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-22 03:10:06,454 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=787, Unknown=0, NotChecked=0, Total=870 [2020-08-22 03:10:06,454 INFO L87 Difference]: Start difference. First operand 68 states and 70 transitions. Second operand 30 states. [2020-08-22 03:10:07,869 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:10:07,870 INFO L93 Difference]: Finished difference Result 134 states and 139 transitions. [2020-08-22 03:10:07,871 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-22 03:10:07,871 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 67 [2020-08-22 03:10:07,871 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:10:07,872 INFO L225 Difference]: With dead ends: 134 [2020-08-22 03:10:07,872 INFO L226 Difference]: Without dead ends: 73 [2020-08-22 03:10:07,874 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=88, Invalid=842, Unknown=0, NotChecked=0, Total=930 [2020-08-22 03:10:07,874 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-08-22 03:10:07,878 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 70. [2020-08-22 03:10:07,878 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-08-22 03:10:07,878 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 72 transitions. [2020-08-22 03:10:07,879 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 72 transitions. Word has length 67 [2020-08-22 03:10:07,879 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:10:07,879 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 72 transitions. [2020-08-22 03:10:07,879 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-22 03:10:07,879 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 72 transitions. [2020-08-22 03:10:07,880 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-08-22 03:10:07,880 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:10:07,880 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:10:07,880 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-22 03:10:07,880 INFO L427 AbstractCegarLoop]: === Iteration 31 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:10:07,880 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:10:07,881 INFO L82 PathProgramCache]: Analyzing trace with hash -2053848445, now seen corresponding path program 27 times [2020-08-22 03:10:07,881 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:10:07,881 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [872149368] [2020-08-22 03:10:07,881 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:10:07,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:08,680 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:10:08,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:08,693 INFO L134 CoverageAnalysis]: Checked inductivity of 731 backedges. 2 proven. 729 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:10:08,693 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [872149368] [2020-08-22 03:10:08,693 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:10:08,694 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-22 03:10:08,694 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [151001339] [2020-08-22 03:10:08,694 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-22 03:10:08,694 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:10:08,695 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-22 03:10:08,695 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=844, Unknown=0, NotChecked=0, Total=930 [2020-08-22 03:10:08,695 INFO L87 Difference]: Start difference. First operand 70 states and 72 transitions. Second operand 31 states. [2020-08-22 03:10:10,076 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:10:10,077 INFO L93 Difference]: Finished difference Result 138 states and 143 transitions. [2020-08-22 03:10:10,081 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-22 03:10:10,081 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 69 [2020-08-22 03:10:10,081 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:10:10,082 INFO L225 Difference]: With dead ends: 138 [2020-08-22 03:10:10,082 INFO L226 Difference]: Without dead ends: 75 [2020-08-22 03:10:10,083 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 [2020-08-22 03:10:10,083 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2020-08-22 03:10:10,087 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 72. [2020-08-22 03:10:10,087 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2020-08-22 03:10:10,088 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 74 transitions. [2020-08-22 03:10:10,088 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 74 transitions. Word has length 69 [2020-08-22 03:10:10,088 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:10:10,088 INFO L479 AbstractCegarLoop]: Abstraction has 72 states and 74 transitions. [2020-08-22 03:10:10,089 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-22 03:10:10,089 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 74 transitions. [2020-08-22 03:10:10,089 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2020-08-22 03:10:10,089 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:10:10,089 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:10:10,089 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-22 03:10:10,089 INFO L427 AbstractCegarLoop]: === Iteration 32 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:10:10,090 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:10:10,090 INFO L82 PathProgramCache]: Analyzing trace with hash -1656861599, now seen corresponding path program 28 times [2020-08-22 03:10:10,090 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:10:10,090 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [876325316] [2020-08-22 03:10:10,090 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:10:10,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:11,023 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:10:11,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:11,036 INFO L134 CoverageAnalysis]: Checked inductivity of 786 backedges. 2 proven. 784 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:10:11,037 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [876325316] [2020-08-22 03:10:11,037 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:10:11,037 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-22 03:10:11,037 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [193368147] [2020-08-22 03:10:11,038 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-22 03:10:11,038 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:10:11,038 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-22 03:10:11,039 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=903, Unknown=0, NotChecked=0, Total=992 [2020-08-22 03:10:11,039 INFO L87 Difference]: Start difference. First operand 72 states and 74 transitions. Second operand 32 states. [2020-08-22 03:10:13,021 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:10:13,021 INFO L93 Difference]: Finished difference Result 142 states and 147 transitions. [2020-08-22 03:10:13,022 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-22 03:10:13,022 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 71 [2020-08-22 03:10:13,022 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:10:13,023 INFO L225 Difference]: With dead ends: 142 [2020-08-22 03:10:13,023 INFO L226 Difference]: Without dead ends: 77 [2020-08-22 03:10:13,024 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 [2020-08-22 03:10:13,024 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2020-08-22 03:10:13,028 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 74. [2020-08-22 03:10:13,028 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2020-08-22 03:10:13,029 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 76 transitions. [2020-08-22 03:10:13,029 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 76 transitions. Word has length 71 [2020-08-22 03:10:13,029 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:10:13,029 INFO L479 AbstractCegarLoop]: Abstraction has 74 states and 76 transitions. [2020-08-22 03:10:13,029 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-22 03:10:13,029 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 76 transitions. [2020-08-22 03:10:13,030 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2020-08-22 03:10:13,030 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:10:13,030 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:10:13,030 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-22 03:10:13,031 INFO L427 AbstractCegarLoop]: === Iteration 33 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:10:13,031 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:10:13,031 INFO L82 PathProgramCache]: Analyzing trace with hash 1890375359, now seen corresponding path program 29 times [2020-08-22 03:10:13,031 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:10:13,031 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1781098737] [2020-08-22 03:10:13,032 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:10:13,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:14,014 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:10:14,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:14,027 INFO L134 CoverageAnalysis]: Checked inductivity of 843 backedges. 2 proven. 841 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:10:14,027 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1781098737] [2020-08-22 03:10:14,028 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:10:14,028 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-22 03:10:14,028 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [226296766] [2020-08-22 03:10:14,029 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-22 03:10:14,029 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:10:14,029 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-22 03:10:14,030 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=964, Unknown=0, NotChecked=0, Total=1056 [2020-08-22 03:10:14,030 INFO L87 Difference]: Start difference. First operand 74 states and 76 transitions. Second operand 33 states. [2020-08-22 03:10:15,675 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:10:15,675 INFO L93 Difference]: Finished difference Result 146 states and 151 transitions. [2020-08-22 03:10:15,676 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-22 03:10:15,676 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 73 [2020-08-22 03:10:15,676 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:10:15,677 INFO L225 Difference]: With dead ends: 146 [2020-08-22 03:10:15,677 INFO L226 Difference]: Without dead ends: 79 [2020-08-22 03:10:15,677 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 [2020-08-22 03:10:15,678 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2020-08-22 03:10:15,681 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 76. [2020-08-22 03:10:15,682 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-08-22 03:10:15,682 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 78 transitions. [2020-08-22 03:10:15,682 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 78 transitions. Word has length 73 [2020-08-22 03:10:15,682 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:10:15,683 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 78 transitions. [2020-08-22 03:10:15,683 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-22 03:10:15,683 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 78 transitions. [2020-08-22 03:10:15,683 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2020-08-22 03:10:15,683 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:10:15,684 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:10:15,684 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-22 03:10:15,684 INFO L427 AbstractCegarLoop]: === Iteration 34 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:10:15,684 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:10:15,684 INFO L82 PathProgramCache]: Analyzing trace with hash 581058973, now seen corresponding path program 30 times [2020-08-22 03:10:15,684 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:10:15,684 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1454261865] [2020-08-22 03:10:15,684 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:10:15,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:16,659 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:10:16,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:16,673 INFO L134 CoverageAnalysis]: Checked inductivity of 902 backedges. 2 proven. 900 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:10:16,673 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1454261865] [2020-08-22 03:10:16,673 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:10:16,673 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-22 03:10:16,673 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1808037199] [2020-08-22 03:10:16,674 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-22 03:10:16,674 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:10:16,674 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-22 03:10:16,675 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=1027, Unknown=0, NotChecked=0, Total=1122 [2020-08-22 03:10:16,675 INFO L87 Difference]: Start difference. First operand 76 states and 78 transitions. Second operand 34 states. [2020-08-22 03:10:18,442 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:10:18,442 INFO L93 Difference]: Finished difference Result 150 states and 155 transitions. [2020-08-22 03:10:18,442 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-22 03:10:18,442 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 75 [2020-08-22 03:10:18,443 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:10:18,443 INFO L225 Difference]: With dead ends: 150 [2020-08-22 03:10:18,443 INFO L226 Difference]: Without dead ends: 81 [2020-08-22 03:10:18,444 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 [2020-08-22 03:10:18,444 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2020-08-22 03:10:18,448 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 78. [2020-08-22 03:10:18,449 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2020-08-22 03:10:18,449 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 80 transitions. [2020-08-22 03:10:18,449 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 80 transitions. Word has length 75 [2020-08-22 03:10:18,450 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:10:18,450 INFO L479 AbstractCegarLoop]: Abstraction has 78 states and 80 transitions. [2020-08-22 03:10:18,450 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-22 03:10:18,450 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 80 transitions. [2020-08-22 03:10:18,451 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2020-08-22 03:10:18,451 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:10:18,451 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:10:18,451 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-22 03:10:18,451 INFO L427 AbstractCegarLoop]: === Iteration 35 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:10:18,451 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:10:18,452 INFO L82 PathProgramCache]: Analyzing trace with hash 753429755, now seen corresponding path program 31 times [2020-08-22 03:10:18,452 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:10:18,452 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [669075092] [2020-08-22 03:10:18,452 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:10:18,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:19,481 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:10:19,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:19,496 INFO L134 CoverageAnalysis]: Checked inductivity of 963 backedges. 2 proven. 961 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:10:19,496 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [669075092] [2020-08-22 03:10:19,496 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:10:19,497 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-22 03:10:19,497 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1729025223] [2020-08-22 03:10:19,497 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-22 03:10:19,497 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:10:19,497 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-22 03:10:19,498 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=1092, Unknown=0, NotChecked=0, Total=1190 [2020-08-22 03:10:19,498 INFO L87 Difference]: Start difference. First operand 78 states and 80 transitions. Second operand 35 states. [2020-08-22 03:10:21,328 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:10:21,328 INFO L93 Difference]: Finished difference Result 154 states and 159 transitions. [2020-08-22 03:10:21,329 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-22 03:10:21,329 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 77 [2020-08-22 03:10:21,330 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:10:21,330 INFO L225 Difference]: With dead ends: 154 [2020-08-22 03:10:21,331 INFO L226 Difference]: Without dead ends: 83 [2020-08-22 03:10:21,332 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 [2020-08-22 03:10:21,332 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2020-08-22 03:10:21,336 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 80. [2020-08-22 03:10:21,337 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2020-08-22 03:10:21,337 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 82 transitions. [2020-08-22 03:10:21,337 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 82 transitions. Word has length 77 [2020-08-22 03:10:21,338 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:10:21,338 INFO L479 AbstractCegarLoop]: Abstraction has 80 states and 82 transitions. [2020-08-22 03:10:21,338 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-22 03:10:21,338 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 82 transitions. [2020-08-22 03:10:21,338 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2020-08-22 03:10:21,338 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:10:21,339 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:10:21,339 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-22 03:10:21,339 INFO L427 AbstractCegarLoop]: === Iteration 36 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:10:21,339 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:10:21,339 INFO L82 PathProgramCache]: Analyzing trace with hash -1101973287, now seen corresponding path program 32 times [2020-08-22 03:10:21,339 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:10:21,339 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1147653045] [2020-08-22 03:10:21,340 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:10:21,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:22,433 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:10:22,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:22,447 INFO L134 CoverageAnalysis]: Checked inductivity of 1026 backedges. 2 proven. 1024 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:10:22,448 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1147653045] [2020-08-22 03:10:22,448 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:10:22,448 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-22 03:10:22,448 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1803980114] [2020-08-22 03:10:22,449 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-22 03:10:22,449 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:10:22,449 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-22 03:10:22,450 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=1159, Unknown=0, NotChecked=0, Total=1260 [2020-08-22 03:10:22,450 INFO L87 Difference]: Start difference. First operand 80 states and 82 transitions. Second operand 36 states. [2020-08-22 03:10:24,373 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:10:24,374 INFO L93 Difference]: Finished difference Result 158 states and 163 transitions. [2020-08-22 03:10:24,374 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-22 03:10:24,375 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 79 [2020-08-22 03:10:24,375 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:10:24,376 INFO L225 Difference]: With dead ends: 158 [2020-08-22 03:10:24,376 INFO L226 Difference]: Without dead ends: 85 [2020-08-22 03:10:24,376 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=106, Invalid=1226, Unknown=0, NotChecked=0, Total=1332 [2020-08-22 03:10:24,377 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2020-08-22 03:10:24,381 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 82. [2020-08-22 03:10:24,381 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2020-08-22 03:10:24,381 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 84 transitions. [2020-08-22 03:10:24,382 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 84 transitions. Word has length 79 [2020-08-22 03:10:24,382 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:10:24,382 INFO L479 AbstractCegarLoop]: Abstraction has 82 states and 84 transitions. [2020-08-22 03:10:24,382 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-22 03:10:24,382 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 84 transitions. [2020-08-22 03:10:24,383 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2020-08-22 03:10:24,383 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:10:24,383 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:10:24,383 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-22 03:10:24,383 INFO L427 AbstractCegarLoop]: === Iteration 37 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:10:24,384 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:10:24,384 INFO L82 PathProgramCache]: Analyzing trace with hash -1732868809, now seen corresponding path program 33 times [2020-08-22 03:10:24,384 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:10:24,384 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1928299067] [2020-08-22 03:10:24,384 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:10:24,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:25,486 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:10:25,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:25,498 INFO L134 CoverageAnalysis]: Checked inductivity of 1091 backedges. 2 proven. 1089 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:10:25,498 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1928299067] [2020-08-22 03:10:25,499 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:10:25,499 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-22 03:10:25,499 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1706034289] [2020-08-22 03:10:25,499 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-22 03:10:25,499 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:10:25,499 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-22 03:10:25,500 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=1228, Unknown=0, NotChecked=0, Total=1332 [2020-08-22 03:10:25,500 INFO L87 Difference]: Start difference. First operand 82 states and 84 transitions. Second operand 37 states. [2020-08-22 03:10:27,464 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:10:27,464 INFO L93 Difference]: Finished difference Result 162 states and 167 transitions. [2020-08-22 03:10:27,467 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-22 03:10:27,467 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 81 [2020-08-22 03:10:27,468 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:10:27,468 INFO L225 Difference]: With dead ends: 162 [2020-08-22 03:10:27,468 INFO L226 Difference]: Without dead ends: 87 [2020-08-22 03:10:27,469 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=109, Invalid=1297, Unknown=0, NotChecked=0, Total=1406 [2020-08-22 03:10:27,470 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2020-08-22 03:10:27,474 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 84. [2020-08-22 03:10:27,474 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2020-08-22 03:10:27,475 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 86 transitions. [2020-08-22 03:10:27,475 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 86 transitions. Word has length 81 [2020-08-22 03:10:27,475 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:10:27,475 INFO L479 AbstractCegarLoop]: Abstraction has 84 states and 86 transitions. [2020-08-22 03:10:27,476 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-22 03:10:27,476 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 86 transitions. [2020-08-22 03:10:27,476 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2020-08-22 03:10:27,476 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:10:27,476 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:10:27,477 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-22 03:10:27,477 INFO L427 AbstractCegarLoop]: === Iteration 38 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:10:27,477 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:10:27,477 INFO L82 PathProgramCache]: Analyzing trace with hash 1861890581, now seen corresponding path program 34 times [2020-08-22 03:10:27,477 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:10:27,477 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [94766373] [2020-08-22 03:10:27,478 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:10:27,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:28,713 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:10:28,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:28,728 INFO L134 CoverageAnalysis]: Checked inductivity of 1158 backedges. 2 proven. 1156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:10:28,728 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [94766373] [2020-08-22 03:10:28,728 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:10:28,728 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-22 03:10:28,729 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [934377844] [2020-08-22 03:10:28,729 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-22 03:10:28,729 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:10:28,729 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-22 03:10:28,730 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=1299, Unknown=0, NotChecked=0, Total=1406 [2020-08-22 03:10:28,730 INFO L87 Difference]: Start difference. First operand 84 states and 86 transitions. Second operand 38 states. [2020-08-22 03:10:30,844 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:10:30,844 INFO L93 Difference]: Finished difference Result 166 states and 171 transitions. [2020-08-22 03:10:30,846 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-22 03:10:30,846 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 83 [2020-08-22 03:10:30,847 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:10:30,847 INFO L225 Difference]: With dead ends: 166 [2020-08-22 03:10:30,847 INFO L226 Difference]: Without dead ends: 89 [2020-08-22 03:10:30,849 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 [2020-08-22 03:10:30,849 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2020-08-22 03:10:30,853 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 86. [2020-08-22 03:10:30,853 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2020-08-22 03:10:30,853 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 88 transitions. [2020-08-22 03:10:30,853 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 88 transitions. Word has length 83 [2020-08-22 03:10:30,854 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:10:30,854 INFO L479 AbstractCegarLoop]: Abstraction has 86 states and 88 transitions. [2020-08-22 03:10:30,854 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-22 03:10:30,854 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 88 transitions. [2020-08-22 03:10:30,855 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2020-08-22 03:10:30,855 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:10:30,855 INFO L422 BasicCegarLoop]: trace histogram [35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:10:30,855 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-22 03:10:30,855 INFO L427 AbstractCegarLoop]: === Iteration 39 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:10:30,855 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:10:30,856 INFO L82 PathProgramCache]: Analyzing trace with hash -1023008909, now seen corresponding path program 35 times [2020-08-22 03:10:30,856 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:10:30,856 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1600703617] [2020-08-22 03:10:30,856 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:10:30,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:32,150 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:10:32,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:32,164 INFO L134 CoverageAnalysis]: Checked inductivity of 1227 backedges. 2 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:10:32,164 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1600703617] [2020-08-22 03:10:32,164 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:10:32,165 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-22 03:10:32,165 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1366121720] [2020-08-22 03:10:32,165 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-22 03:10:32,165 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:10:32,165 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-22 03:10:32,166 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=1372, Unknown=0, NotChecked=0, Total=1482 [2020-08-22 03:10:32,166 INFO L87 Difference]: Start difference. First operand 86 states and 88 transitions. Second operand 39 states. [2020-08-22 03:10:34,415 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:10:34,416 INFO L93 Difference]: Finished difference Result 170 states and 175 transitions. [2020-08-22 03:10:34,416 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-22 03:10:34,416 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 85 [2020-08-22 03:10:34,417 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:10:34,417 INFO L225 Difference]: With dead ends: 170 [2020-08-22 03:10:34,418 INFO L226 Difference]: Without dead ends: 91 [2020-08-22 03:10:34,418 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 [2020-08-22 03:10:34,420 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2020-08-22 03:10:34,432 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 88. [2020-08-22 03:10:34,432 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2020-08-22 03:10:34,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 90 transitions. [2020-08-22 03:10:34,433 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 90 transitions. Word has length 85 [2020-08-22 03:10:34,433 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:10:34,433 INFO L479 AbstractCegarLoop]: Abstraction has 88 states and 90 transitions. [2020-08-22 03:10:34,434 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-22 03:10:34,434 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 90 transitions. [2020-08-22 03:10:34,434 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2020-08-22 03:10:34,435 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:10:34,435 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:10:34,435 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-22 03:10:34,435 INFO L427 AbstractCegarLoop]: === Iteration 40 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:10:34,436 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:10:34,436 INFO L82 PathProgramCache]: Analyzing trace with hash 1137454417, now seen corresponding path program 36 times [2020-08-22 03:10:34,436 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:10:34,436 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [872194136] [2020-08-22 03:10:34,436 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:10:34,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:35,774 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:10:35,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:35,788 INFO L134 CoverageAnalysis]: Checked inductivity of 1298 backedges. 2 proven. 1296 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:10:35,788 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [872194136] [2020-08-22 03:10:35,788 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:10:35,788 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-22 03:10:35,788 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2016324914] [2020-08-22 03:10:35,789 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-22 03:10:35,789 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:10:35,789 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-22 03:10:35,790 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=1447, Unknown=0, NotChecked=0, Total=1560 [2020-08-22 03:10:35,790 INFO L87 Difference]: Start difference. First operand 88 states and 90 transitions. Second operand 40 states. [2020-08-22 03:10:38,121 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:10:38,121 INFO L93 Difference]: Finished difference Result 174 states and 179 transitions. [2020-08-22 03:10:38,123 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-22 03:10:38,123 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 87 [2020-08-22 03:10:38,123 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:10:38,124 INFO L225 Difference]: With dead ends: 174 [2020-08-22 03:10:38,124 INFO L226 Difference]: Without dead ends: 93 [2020-08-22 03:10:38,125 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=118, Invalid=1522, Unknown=0, NotChecked=0, Total=1640 [2020-08-22 03:10:38,125 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2020-08-22 03:10:38,130 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 90. [2020-08-22 03:10:38,130 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2020-08-22 03:10:38,131 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 92 transitions. [2020-08-22 03:10:38,131 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 92 transitions. Word has length 87 [2020-08-22 03:10:38,131 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:10:38,131 INFO L479 AbstractCegarLoop]: Abstraction has 90 states and 92 transitions. [2020-08-22 03:10:38,131 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-22 03:10:38,132 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 92 transitions. [2020-08-22 03:10:38,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2020-08-22 03:10:38,132 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:10:38,133 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:10:38,133 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-22 03:10:38,133 INFO L427 AbstractCegarLoop]: === Iteration 41 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:10:38,133 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:10:38,133 INFO L82 PathProgramCache]: Analyzing trace with hash -1421460561, now seen corresponding path program 37 times [2020-08-22 03:10:38,134 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:10:38,134 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [356067070] [2020-08-22 03:10:38,134 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:10:38,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:39,637 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:10:39,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:39,650 INFO L134 CoverageAnalysis]: Checked inductivity of 1371 backedges. 2 proven. 1369 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:10:39,651 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [356067070] [2020-08-22 03:10:39,651 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:10:39,651 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-22 03:10:39,651 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1949656717] [2020-08-22 03:10:39,651 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-22 03:10:39,651 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:10:39,652 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-22 03:10:39,652 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=1524, Unknown=0, NotChecked=0, Total=1640 [2020-08-22 03:10:39,652 INFO L87 Difference]: Start difference. First operand 90 states and 92 transitions. Second operand 41 states.