/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=1000 --traceabstraction.additional.smt.options interpolation-heuristic=SMALLEST --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/const_1-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 16:39:34,461 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 16:39:34,464 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 16:39:34,504 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 16:39:34,504 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 16:39:34,513 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 16:39:34,516 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 16:39:34,517 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 16:39:34,519 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 16:39:34,520 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 16:39:34,521 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 16:39:34,522 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 16:39:34,522 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 16:39:34,523 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 16:39:34,524 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 16:39:34,525 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 16:39:34,526 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 16:39:34,527 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 16:39:34,528 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 16:39:34,530 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 16:39:34,531 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 16:39:34,532 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 16:39:34,534 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 16:39:34,534 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 16:39:34,536 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-21 16:39:34,537 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-21 16:39:34,537 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-21 16:39:34,538 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-21 16:39:34,538 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-21 16:39:34,539 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... 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[2020-08-21 16:39:34,544 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 16:39:34,545 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 16:39:34,546 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 16:39:34,546 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-21 16:39:34,572 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 16:39:34,572 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 16:39:34,573 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 16:39:34,574 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 16:39:34,574 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 16:39:34,574 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 16:39:34,574 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 16:39:34,574 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 16:39:34,575 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 16:39:34,575 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 16:39:34,575 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 16:39:34,575 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 16:39:34,575 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 16:39:34,576 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 16:39:34,576 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 16:39:34,576 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 16:39:34,576 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 16:39:34,576 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 16:39:34,577 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 16:39:34,577 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 16:39:34,577 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 16:39:34,577 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 16:39:34,577 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 16:39:34,578 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 16:39:34,578 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 16:39:34,578 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 16:39:34,578 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 16:39:34,579 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 16:39:34,579 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 16:39:34,579 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=1000;interpolation-heuristic=SMALLEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=1000;interpolation-heuristic=SMALLEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=1000;interpolation-heuristic=SMALLEST;log-additional-information=true; [2020-08-21 16:39:34,899 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 16:39:34,911 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 16:39:34,915 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 16:39:34,917 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 16:39:34,917 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 16:39:34,918 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/const_1-1.c [2020-08-21 16:39:34,989 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/10f106ffb/85492b14297146bf8fe9b78137fec010/FLAG5b9c37a91 [2020-08-21 16:39:35,410 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 16:39:35,411 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-acceleration/const_1-1.c [2020-08-21 16:39:35,419 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/10f106ffb/85492b14297146bf8fe9b78137fec010/FLAG5b9c37a91 [2020-08-21 16:39:35,789 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/10f106ffb/85492b14297146bf8fe9b78137fec010 [2020-08-21 16:39:35,798 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 16:39:35,800 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 16:39:35,801 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 16:39:35,801 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 16:39:35,805 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 16:39:35,806 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 04:39:35" (1/1) ... [2020-08-21 16:39:35,809 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@16b81ec8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 04:39:35, skipping insertion in model container [2020-08-21 16:39:35,809 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 04:39:35" (1/1) ... [2020-08-21 16:39:35,817 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 16:39:35,836 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 16:39:36,036 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 16:39:36,040 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 16:39:36,052 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 16:39:36,066 INFO L208 MainTranslator]: Completed translation [2020-08-21 16:39:36,067 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 04:39:36 WrapperNode [2020-08-21 16:39:36,067 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 16:39:36,067 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 16:39:36,068 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 16:39:36,068 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 16:39:36,078 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 04:39:36" (1/1) ... [2020-08-21 16:39:36,078 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 04:39:36" (1/1) ... [2020-08-21 16:39:36,083 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 04:39:36" (1/1) ... [2020-08-21 16:39:36,083 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 04:39:36" (1/1) ... [2020-08-21 16:39:36,164 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 04:39:36" (1/1) ... [2020-08-21 16:39:36,170 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 04:39:36" (1/1) ... [2020-08-21 16:39:36,171 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 04:39:36" (1/1) ... [2020-08-21 16:39:36,173 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 16:39:36,173 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 16:39:36,174 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 16:39:36,174 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 16:39:36,175 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 04:39:36" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 16:39:36,228 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 16:39:36,228 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 16:39:36,228 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-21 16:39:36,228 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 16:39:36,228 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 16:39:36,229 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-21 16:39:36,229 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 16:39:36,229 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 16:39:36,229 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 16:39:36,408 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 16:39:36,408 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-21 16:39:36,413 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 04:39:36 BoogieIcfgContainer [2020-08-21 16:39:36,413 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 16:39:36,417 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 16:39:36,417 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 16:39:36,421 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 16:39:36,422 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 04:39:35" (1/3) ... [2020-08-21 16:39:36,423 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4d7223ec and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 04:39:36, skipping insertion in model container [2020-08-21 16:39:36,423 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 04:39:36" (2/3) ... [2020-08-21 16:39:36,424 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4d7223ec and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 04:39:36, skipping insertion in model container [2020-08-21 16:39:36,424 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 04:39:36" (3/3) ... [2020-08-21 16:39:36,428 INFO L109 eAbstractionObserver]: Analyzing ICFG const_1-1.c [2020-08-21 16:39:36,437 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 16:39:36,445 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 16:39:36,456 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 16:39:36,480 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 16:39:36,480 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 16:39:36,481 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 16:39:36,481 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 16:39:36,481 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 16:39:36,481 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 16:39:36,481 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 16:39:36,482 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 16:39:36,499 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2020-08-21 16:39:36,504 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-21 16:39:36,504 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:39:36,505 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:39:36,505 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:39:36,510 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:39:36,510 INFO L82 PathProgramCache]: Analyzing trace with hash 1846144830, now seen corresponding path program 1 times [2020-08-21 16:39:36,517 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:39:36,518 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1666764377] [2020-08-21 16:39:36,518 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:39:36,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:36,714 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:39:36,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:36,730 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:39:36,732 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1666764377] [2020-08-21 16:39:36,735 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 16:39:36,736 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-21 16:39:36,737 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1852271245] [2020-08-21 16:39:36,744 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-21 16:39:36,745 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:39:36,766 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-21 16:39:36,782 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 16:39:36,785 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 3 states. [2020-08-21 16:39:36,834 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:39:36,834 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2020-08-21 16:39:36,835 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 16:39:36,843 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-08-21 16:39:36,844 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:39:36,852 INFO L225 Difference]: With dead ends: 29 [2020-08-21 16:39:36,853 INFO L226 Difference]: Without dead ends: 12 [2020-08-21 16:39:36,857 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 16:39:36,877 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2020-08-21 16:39:36,904 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2020-08-21 16:39:36,906 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2020-08-21 16:39:36,908 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2020-08-21 16:39:36,911 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2020-08-21 16:39:36,911 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:39:36,911 INFO L479 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2020-08-21 16:39:36,913 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-21 16:39:36,913 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2020-08-21 16:39:36,915 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-08-21 16:39:36,915 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:39:36,916 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:39:36,919 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 16:39:36,920 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:39:36,921 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:39:36,921 INFO L82 PathProgramCache]: Analyzing trace with hash 1432376145, now seen corresponding path program 1 times [2020-08-21 16:39:36,921 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:39:36,923 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1286255668] [2020-08-21 16:39:36,923 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:39:36,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:37,089 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:39:37,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:37,097 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:39:37,099 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1286255668] [2020-08-21 16:39:37,099 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:39:37,100 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2020-08-21 16:39:37,100 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [228995251] [2020-08-21 16:39:37,103 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 16:39:37,104 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:39:37,105 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 16:39:37,105 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-21 16:39:37,105 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 4 states. [2020-08-21 16:39:37,137 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:39:37,137 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2020-08-21 16:39:37,139 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-21 16:39:37,139 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 11 [2020-08-21 16:39:37,139 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:39:37,140 INFO L225 Difference]: With dead ends: 18 [2020-08-21 16:39:37,140 INFO L226 Difference]: Without dead ends: 13 [2020-08-21 16:39:37,142 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-21 16:39:37,143 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-08-21 16:39:37,147 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-08-21 16:39:37,148 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-08-21 16:39:37,148 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2020-08-21 16:39:37,149 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 11 [2020-08-21 16:39:37,149 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:39:37,149 INFO L479 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2020-08-21 16:39:37,149 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 16:39:37,150 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2020-08-21 16:39:37,150 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-21 16:39:37,150 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:39:37,151 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:39:37,151 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 16:39:37,151 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:39:37,152 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:39:37,152 INFO L82 PathProgramCache]: Analyzing trace with hash 1490448798, now seen corresponding path program 2 times [2020-08-21 16:39:37,152 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:39:37,153 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [345112561] [2020-08-21 16:39:37,153 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:39:37,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:37,251 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:39:37,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:37,255 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:39:37,256 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [345112561] [2020-08-21 16:39:37,256 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:39:37,257 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-21 16:39:37,257 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1451164854] [2020-08-21 16:39:37,257 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 16:39:37,258 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:39:37,258 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 16:39:37,258 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-21 16:39:37,259 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 5 states. [2020-08-21 16:39:37,281 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:39:37,281 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2020-08-21 16:39:37,282 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 16:39:37,282 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 12 [2020-08-21 16:39:37,283 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:39:37,283 INFO L225 Difference]: With dead ends: 19 [2020-08-21 16:39:37,283 INFO L226 Difference]: Without dead ends: 14 [2020-08-21 16:39:37,284 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-21 16:39:37,285 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-08-21 16:39:37,289 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-08-21 16:39:37,289 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-08-21 16:39:37,290 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2020-08-21 16:39:37,290 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2020-08-21 16:39:37,290 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:39:37,291 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2020-08-21 16:39:37,291 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 16:39:37,291 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2020-08-21 16:39:37,291 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-21 16:39:37,292 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:39:37,292 INFO L422 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:39:37,292 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 16:39:37,292 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:39:37,293 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:39:37,293 INFO L82 PathProgramCache]: Analyzing trace with hash -1004266255, now seen corresponding path program 3 times [2020-08-21 16:39:37,293 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:39:37,294 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1999264233] [2020-08-21 16:39:37,294 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:39:37,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:37,413 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:39:37,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:37,417 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:39:37,417 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1999264233] [2020-08-21 16:39:37,418 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:39:37,418 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-21 16:39:37,418 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1158954638] [2020-08-21 16:39:37,419 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 16:39:37,419 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:39:37,419 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 16:39:37,419 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-21 16:39:37,420 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 6 states. [2020-08-21 16:39:37,451 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:39:37,451 INFO L93 Difference]: Finished difference Result 20 states and 20 transitions. [2020-08-21 16:39:37,452 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 16:39:37,452 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 13 [2020-08-21 16:39:37,452 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:39:37,453 INFO L225 Difference]: With dead ends: 20 [2020-08-21 16:39:37,453 INFO L226 Difference]: Without dead ends: 15 [2020-08-21 16:39:37,454 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-21 16:39:37,454 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-21 16:39:37,458 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-21 16:39:37,458 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-21 16:39:37,459 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2020-08-21 16:39:37,459 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 13 [2020-08-21 16:39:37,459 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:39:37,459 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2020-08-21 16:39:37,459 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 16:39:37,460 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2020-08-21 16:39:37,460 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-08-21 16:39:37,460 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:39:37,460 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:39:37,461 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 16:39:37,461 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:39:37,461 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:39:37,461 INFO L82 PathProgramCache]: Analyzing trace with hash -1031021570, now seen corresponding path program 4 times [2020-08-21 16:39:37,462 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:39:37,462 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1668983127] [2020-08-21 16:39:37,462 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:39:37,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:37,564 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:39:37,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:37,567 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:39:37,568 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1668983127] [2020-08-21 16:39:37,568 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:39:37,568 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 16:39:37,569 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1882162938] [2020-08-21 16:39:37,569 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 16:39:37,569 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:39:37,570 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 16:39:37,570 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-08-21 16:39:37,570 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 7 states. [2020-08-21 16:39:37,608 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:39:37,608 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2020-08-21 16:39:37,609 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 16:39:37,609 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 14 [2020-08-21 16:39:37,610 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:39:37,610 INFO L225 Difference]: With dead ends: 21 [2020-08-21 16:39:37,610 INFO L226 Difference]: Without dead ends: 16 [2020-08-21 16:39:37,611 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-08-21 16:39:37,612 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-21 16:39:37,616 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-08-21 16:39:37,616 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-21 16:39:37,617 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2020-08-21 16:39:37,617 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 14 [2020-08-21 16:39:37,617 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:39:37,617 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2020-08-21 16:39:37,618 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 16:39:37,618 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2020-08-21 16:39:37,618 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-21 16:39:37,618 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:39:37,619 INFO L422 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:39:37,619 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 16:39:37,619 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:39:37,619 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:39:37,620 INFO L82 PathProgramCache]: Analyzing trace with hash -1860436335, now seen corresponding path program 5 times [2020-08-21 16:39:37,620 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:39:37,620 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1976186224] [2020-08-21 16:39:37,620 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:39:37,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:37,769 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:39:37,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:37,772 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:39:37,772 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1976186224] [2020-08-21 16:39:37,772 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:39:37,773 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 16:39:37,773 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [996453815] [2020-08-21 16:39:37,773 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 16:39:37,773 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:39:37,774 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 16:39:37,774 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-08-21 16:39:37,774 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 8 states. [2020-08-21 16:39:37,815 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:39:37,815 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2020-08-21 16:39:37,815 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-21 16:39:37,816 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 15 [2020-08-21 16:39:37,816 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:39:37,817 INFO L225 Difference]: With dead ends: 22 [2020-08-21 16:39:37,817 INFO L226 Difference]: Without dead ends: 17 [2020-08-21 16:39:37,817 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-08-21 16:39:37,818 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-21 16:39:37,821 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-21 16:39:37,821 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-21 16:39:37,822 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-08-21 16:39:37,822 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 15 [2020-08-21 16:39:37,823 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:39:37,823 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-08-21 16:39:37,823 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 16:39:37,823 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-08-21 16:39:37,823 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-21 16:39:37,824 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:39:37,824 INFO L422 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:39:37,824 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 16:39:37,824 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:39:37,824 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:39:37,825 INFO L82 PathProgramCache]: Analyzing trace with hash -1802490274, now seen corresponding path program 6 times [2020-08-21 16:39:37,825 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:39:37,825 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [574288676] [2020-08-21 16:39:37,825 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:39:37,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:37,956 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:39:37,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:37,959 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:39:37,960 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [574288676] [2020-08-21 16:39:37,960 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:39:37,960 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 16:39:37,960 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1623024679] [2020-08-21 16:39:37,961 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 16:39:37,961 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:39:37,961 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 16:39:37,962 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-21 16:39:37,962 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 9 states. [2020-08-21 16:39:38,014 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:39:38,015 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2020-08-21 16:39:38,015 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 16:39:38,015 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 16 [2020-08-21 16:39:38,016 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:39:38,016 INFO L225 Difference]: With dead ends: 23 [2020-08-21 16:39:38,016 INFO L226 Difference]: Without dead ends: 18 [2020-08-21 16:39:38,017 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-21 16:39:38,017 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-08-21 16:39:38,021 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-08-21 16:39:38,021 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-21 16:39:38,022 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2020-08-21 16:39:38,022 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 16 [2020-08-21 16:39:38,022 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:39:38,022 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2020-08-21 16:39:38,023 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 16:39:38,023 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2020-08-21 16:39:38,023 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-21 16:39:38,023 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:39:38,024 INFO L422 BasicCegarLoop]: trace histogram [7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:39:38,024 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 16:39:38,024 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:39:38,024 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:39:38,025 INFO L82 PathProgramCache]: Analyzing trace with hash -6162383, now seen corresponding path program 7 times [2020-08-21 16:39:38,025 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:39:38,025 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2109796523] [2020-08-21 16:39:38,025 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:39:38,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:38,176 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:39:38,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:38,181 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:39:38,182 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2109796523] [2020-08-21 16:39:38,182 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:39:38,182 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-21 16:39:38,182 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [720606182] [2020-08-21 16:39:38,183 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 16:39:38,183 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:39:38,183 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 16:39:38,184 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2020-08-21 16:39:38,184 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 10 states. [2020-08-21 16:39:38,243 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:39:38,243 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2020-08-21 16:39:38,245 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 16:39:38,245 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 17 [2020-08-21 16:39:38,245 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:39:38,246 INFO L225 Difference]: With dead ends: 24 [2020-08-21 16:39:38,246 INFO L226 Difference]: Without dead ends: 19 [2020-08-21 16:39:38,247 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2020-08-21 16:39:38,248 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-08-21 16:39:38,253 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-08-21 16:39:38,254 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-08-21 16:39:38,254 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2020-08-21 16:39:38,254 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 17 [2020-08-21 16:39:38,255 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:39:38,255 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2020-08-21 16:39:38,255 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 16:39:38,255 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2020-08-21 16:39:38,256 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-21 16:39:38,257 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:39:38,257 INFO L422 BasicCegarLoop]: trace histogram [8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:39:38,257 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-21 16:39:38,257 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:39:38,257 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:39:38,258 INFO L82 PathProgramCache]: Analyzing trace with hash -154572610, now seen corresponding path program 8 times [2020-08-21 16:39:38,258 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:39:38,258 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [334307869] [2020-08-21 16:39:38,259 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:39:38,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:38,454 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:39:38,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:38,457 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:39:38,460 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [334307869] [2020-08-21 16:39:38,461 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:39:38,461 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-21 16:39:38,461 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [604862959] [2020-08-21 16:39:38,462 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 16:39:38,463 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:39:38,463 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 16:39:38,463 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-08-21 16:39:38,464 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 11 states. [2020-08-21 16:39:38,551 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:39:38,551 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2020-08-21 16:39:38,552 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-21 16:39:38,553 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 18 [2020-08-21 16:39:38,553 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:39:38,553 INFO L225 Difference]: With dead ends: 25 [2020-08-21 16:39:38,553 INFO L226 Difference]: Without dead ends: 20 [2020-08-21 16:39:38,554 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-08-21 16:39:38,554 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-21 16:39:38,559 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-21 16:39:38,559 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-21 16:39:38,560 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2020-08-21 16:39:38,560 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 18 [2020-08-21 16:39:38,560 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:39:38,561 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2020-08-21 16:39:38,565 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 16:39:38,565 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2020-08-21 16:39:38,566 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-21 16:39:38,566 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:39:38,566 INFO L422 BasicCegarLoop]: trace histogram [9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:39:38,567 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-21 16:39:38,567 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:39:38,567 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:39:38,568 INFO L82 PathProgramCache]: Analyzing trace with hash -460322351, now seen corresponding path program 9 times [2020-08-21 16:39:38,568 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:39:38,568 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [157621917] [2020-08-21 16:39:38,570 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:39:38,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:38,776 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:39:38,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:38,780 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:39:38,780 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [157621917] [2020-08-21 16:39:38,781 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:39:38,782 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-21 16:39:38,782 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [81917991] [2020-08-21 16:39:38,783 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-21 16:39:38,783 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:39:38,783 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-21 16:39:38,784 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-08-21 16:39:38,784 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 12 states. [2020-08-21 16:39:38,887 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:39:38,887 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2020-08-21 16:39:38,888 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-21 16:39:38,888 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 19 [2020-08-21 16:39:38,888 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:39:38,889 INFO L225 Difference]: With dead ends: 26 [2020-08-21 16:39:38,889 INFO L226 Difference]: Without dead ends: 21 [2020-08-21 16:39:38,889 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-08-21 16:39:38,890 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-21 16:39:38,896 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-08-21 16:39:38,896 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-21 16:39:38,899 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2020-08-21 16:39:38,900 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 19 [2020-08-21 16:39:38,900 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:39:38,900 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2020-08-21 16:39:38,900 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-21 16:39:38,900 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2020-08-21 16:39:38,903 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-21 16:39:38,903 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:39:38,903 INFO L422 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:39:38,904 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-21 16:39:38,904 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:39:38,904 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:39:38,904 INFO L82 PathProgramCache]: Analyzing trace with hash -1348629730, now seen corresponding path program 10 times [2020-08-21 16:39:38,904 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:39:38,905 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1955996210] [2020-08-21 16:39:38,905 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:39:38,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:39,126 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:39:39,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:39,129 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:39:39,129 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1955996210] [2020-08-21 16:39:39,130 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:39:39,130 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 16:39:39,130 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [235530971] [2020-08-21 16:39:39,131 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 16:39:39,132 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:39:39,132 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 16:39:39,132 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2020-08-21 16:39:39,132 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 13 states. [2020-08-21 16:39:39,240 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:39:39,241 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2020-08-21 16:39:39,243 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-21 16:39:39,243 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 20 [2020-08-21 16:39:39,243 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:39:39,246 INFO L225 Difference]: With dead ends: 27 [2020-08-21 16:39:39,246 INFO L226 Difference]: Without dead ends: 22 [2020-08-21 16:39:39,247 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2020-08-21 16:39:39,247 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-21 16:39:39,252 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2020-08-21 16:39:39,252 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-08-21 16:39:39,253 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2020-08-21 16:39:39,253 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 20 [2020-08-21 16:39:39,254 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:39:39,256 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2020-08-21 16:39:39,256 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 16:39:39,257 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2020-08-21 16:39:39,257 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-08-21 16:39:39,257 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:39:39,257 INFO L422 BasicCegarLoop]: trace histogram [11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:39:39,258 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-21 16:39:39,259 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:39:39,259 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:39:39,259 INFO L82 PathProgramCache]: Analyzing trace with hash 1178612593, now seen corresponding path program 11 times [2020-08-21 16:39:39,259 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:39:39,260 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1561304338] [2020-08-21 16:39:39,260 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:39:39,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:39,477 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:39:39,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:39,481 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:39:39,481 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1561304338] [2020-08-21 16:39:39,482 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:39:39,482 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-21 16:39:39,482 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [872710831] [2020-08-21 16:39:39,483 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-21 16:39:39,484 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:39:39,484 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-21 16:39:39,485 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2020-08-21 16:39:39,485 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 14 states. [2020-08-21 16:39:39,592 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:39:39,593 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2020-08-21 16:39:39,594 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-21 16:39:39,594 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 21 [2020-08-21 16:39:39,595 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:39:39,595 INFO L225 Difference]: With dead ends: 28 [2020-08-21 16:39:39,595 INFO L226 Difference]: Without dead ends: 23 [2020-08-21 16:39:39,596 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2020-08-21 16:39:39,596 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-21 16:39:39,603 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-08-21 16:39:39,603 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-21 16:39:39,604 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2020-08-21 16:39:39,604 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 21 [2020-08-21 16:39:39,604 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:39:39,604 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2020-08-21 16:39:39,604 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-21 16:39:39,604 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2020-08-21 16:39:39,605 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-21 16:39:39,605 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:39:39,605 INFO L422 BasicCegarLoop]: trace histogram [12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:39:39,605 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-21 16:39:39,608 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:39:39,609 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:39:39,609 INFO L82 PathProgramCache]: Analyzing trace with hash -2081254018, now seen corresponding path program 12 times [2020-08-21 16:39:39,609 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:39:39,609 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1857350954] [2020-08-21 16:39:39,610 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:39:39,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:39,838 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:39:39,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:39,841 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:39:39,841 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1857350954] [2020-08-21 16:39:39,842 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:39:39,842 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-21 16:39:39,842 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [288818704] [2020-08-21 16:39:39,842 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-21 16:39:39,843 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:39:39,843 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-21 16:39:39,843 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2020-08-21 16:39:39,843 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 15 states. [2020-08-21 16:39:39,966 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:39:39,966 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2020-08-21 16:39:39,966 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-21 16:39:39,967 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 22 [2020-08-21 16:39:39,967 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:39:39,967 INFO L225 Difference]: With dead ends: 29 [2020-08-21 16:39:39,967 INFO L226 Difference]: Without dead ends: 24 [2020-08-21 16:39:39,968 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2020-08-21 16:39:39,968 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-21 16:39:39,972 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-08-21 16:39:39,972 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-21 16:39:39,972 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2020-08-21 16:39:39,973 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 22 [2020-08-21 16:39:39,973 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:39:39,973 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2020-08-21 16:39:39,973 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-21 16:39:39,973 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2020-08-21 16:39:39,974 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-08-21 16:39:39,974 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:39:39,974 INFO L422 BasicCegarLoop]: trace histogram [13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:39:39,974 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-21 16:39:39,974 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:39:39,975 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:39:39,975 INFO L82 PathProgramCache]: Analyzing trace with hash -57903855, now seen corresponding path program 13 times [2020-08-21 16:39:39,975 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:39:39,975 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [182264018] [2020-08-21 16:39:39,975 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:39:39,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:40,181 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:39:40,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:40,184 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:39:40,184 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [182264018] [2020-08-21 16:39:40,184 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:39:40,184 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-21 16:39:40,185 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2004087950] [2020-08-21 16:39:40,185 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-21 16:39:40,185 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:39:40,186 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-21 16:39:40,186 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2020-08-21 16:39:40,186 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 16 states. [2020-08-21 16:39:40,317 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:39:40,317 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2020-08-21 16:39:40,317 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-21 16:39:40,318 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 23 [2020-08-21 16:39:40,318 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:39:40,318 INFO L225 Difference]: With dead ends: 30 [2020-08-21 16:39:40,319 INFO L226 Difference]: Without dead ends: 25 [2020-08-21 16:39:40,319 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2020-08-21 16:39:40,320 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-21 16:39:40,323 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-08-21 16:39:40,323 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-21 16:39:40,324 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2020-08-21 16:39:40,324 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 23 [2020-08-21 16:39:40,324 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:39:40,324 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2020-08-21 16:39:40,324 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-21 16:39:40,324 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2020-08-21 16:39:40,325 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-21 16:39:40,325 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:39:40,325 INFO L422 BasicCegarLoop]: trace histogram [14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:39:40,326 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-21 16:39:40,326 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:39:40,326 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:39:40,326 INFO L82 PathProgramCache]: Analyzing trace with hash -1758558242, now seen corresponding path program 14 times [2020-08-21 16:39:40,326 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:39:40,327 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1633482626] [2020-08-21 16:39:40,327 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:39:40,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:40,566 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:39:40,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:40,569 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:39:40,570 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1633482626] [2020-08-21 16:39:40,570 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:39:40,570 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-21 16:39:40,570 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [357268215] [2020-08-21 16:39:40,571 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-21 16:39:40,572 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:39:40,572 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-21 16:39:40,572 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2020-08-21 16:39:40,572 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 17 states. [2020-08-21 16:39:40,734 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:39:40,734 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2020-08-21 16:39:40,735 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-21 16:39:40,735 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 24 [2020-08-21 16:39:40,735 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:39:40,736 INFO L225 Difference]: With dead ends: 31 [2020-08-21 16:39:40,736 INFO L226 Difference]: Without dead ends: 26 [2020-08-21 16:39:40,739 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2020-08-21 16:39:40,740 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-21 16:39:40,745 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-08-21 16:39:40,746 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-21 16:39:40,746 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2020-08-21 16:39:40,746 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 24 [2020-08-21 16:39:40,747 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:39:40,749 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2020-08-21 16:39:40,749 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-21 16:39:40,749 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2020-08-21 16:39:40,750 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-21 16:39:40,750 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:39:40,750 INFO L422 BasicCegarLoop]: trace histogram [15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:39:40,750 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-21 16:39:40,750 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:39:40,751 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:39:40,751 INFO L82 PathProgramCache]: Analyzing trace with hash 1355730609, now seen corresponding path program 15 times [2020-08-21 16:39:40,751 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:39:40,751 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1781543105] [2020-08-21 16:39:40,751 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:39:40,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:41,022 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:39:41,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:41,025 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:39:41,025 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1781543105] [2020-08-21 16:39:41,025 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:39:41,025 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-21 16:39:41,026 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [501979958] [2020-08-21 16:39:41,026 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-21 16:39:41,026 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:39:41,027 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-21 16:39:41,027 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2020-08-21 16:39:41,027 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 18 states. [2020-08-21 16:39:41,209 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:39:41,210 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2020-08-21 16:39:41,210 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-21 16:39:41,210 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 25 [2020-08-21 16:39:41,211 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:39:41,211 INFO L225 Difference]: With dead ends: 32 [2020-08-21 16:39:41,211 INFO L226 Difference]: Without dead ends: 27 [2020-08-21 16:39:41,212 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2020-08-21 16:39:41,212 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-08-21 16:39:41,215 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-08-21 16:39:41,215 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-21 16:39:41,216 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2020-08-21 16:39:41,217 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 25 [2020-08-21 16:39:41,217 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:39:41,217 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2020-08-21 16:39:41,217 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-21 16:39:41,217 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2020-08-21 16:39:41,217 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-21 16:39:41,218 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:39:41,218 INFO L422 BasicCegarLoop]: trace histogram [16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:39:41,218 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-21 16:39:41,218 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:39:41,218 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:39:41,218 INFO L82 PathProgramCache]: Analyzing trace with hash -885562818, now seen corresponding path program 16 times [2020-08-21 16:39:41,219 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:39:41,219 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1852534053] [2020-08-21 16:39:41,219 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:39:41,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:41,501 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:39:41,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:41,504 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:39:41,504 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1852534053] [2020-08-21 16:39:41,504 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:39:41,504 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-21 16:39:41,505 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [308559002] [2020-08-21 16:39:41,505 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-21 16:39:41,505 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:39:41,506 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-21 16:39:41,506 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2020-08-21 16:39:41,506 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 19 states. [2020-08-21 16:39:41,740 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:39:41,740 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2020-08-21 16:39:41,741 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-21 16:39:41,741 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 26 [2020-08-21 16:39:41,741 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:39:41,742 INFO L225 Difference]: With dead ends: 33 [2020-08-21 16:39:41,742 INFO L226 Difference]: Without dead ends: 28 [2020-08-21 16:39:41,743 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2020-08-21 16:39:41,743 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-21 16:39:41,747 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-08-21 16:39:41,747 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-21 16:39:41,747 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2020-08-21 16:39:41,748 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 26 [2020-08-21 16:39:41,748 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:39:41,748 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2020-08-21 16:39:41,748 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-21 16:39:41,748 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2020-08-21 16:39:41,749 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-21 16:39:41,749 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:39:41,749 INFO L422 BasicCegarLoop]: trace histogram [17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:39:41,749 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-21 16:39:41,749 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:39:41,750 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:39:41,750 INFO L82 PathProgramCache]: Analyzing trace with hash -1646182319, now seen corresponding path program 17 times [2020-08-21 16:39:41,750 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:39:41,750 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [911960748] [2020-08-21 16:39:41,750 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:39:41,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:42,062 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:39:42,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:42,067 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:39:42,067 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [911960748] [2020-08-21 16:39:42,067 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:39:42,067 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-21 16:39:42,068 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [373446897] [2020-08-21 16:39:42,068 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-21 16:39:42,068 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:39:42,068 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-21 16:39:42,069 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2020-08-21 16:39:42,069 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 20 states. [2020-08-21 16:39:42,285 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:39:42,285 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2020-08-21 16:39:42,285 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-21 16:39:42,286 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 27 [2020-08-21 16:39:42,286 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:39:42,286 INFO L225 Difference]: With dead ends: 34 [2020-08-21 16:39:42,286 INFO L226 Difference]: Without dead ends: 29 [2020-08-21 16:39:42,287 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2020-08-21 16:39:42,288 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-21 16:39:42,291 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-08-21 16:39:42,291 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-21 16:39:42,292 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2020-08-21 16:39:42,292 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 27 [2020-08-21 16:39:42,292 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:39:42,292 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2020-08-21 16:39:42,292 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-21 16:39:42,292 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2020-08-21 16:39:42,293 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-21 16:39:42,293 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:39:42,293 INFO L422 BasicCegarLoop]: trace histogram [18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:39:42,293 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-21 16:39:42,294 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:39:42,294 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:39:42,294 INFO L82 PathProgramCache]: Analyzing trace with hash 544416926, now seen corresponding path program 18 times [2020-08-21 16:39:42,294 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:39:42,294 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1813533780] [2020-08-21 16:39:42,294 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:39:42,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:42,655 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:39:42,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:42,658 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:39:42,658 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1813533780] [2020-08-21 16:39:42,658 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:39:42,658 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-21 16:39:42,659 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1493756277] [2020-08-21 16:39:42,660 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-21 16:39:42,661 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:39:42,661 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-21 16:39:42,661 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=363, Unknown=0, NotChecked=0, Total=420 [2020-08-21 16:39:42,662 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 21 states. [2020-08-21 16:39:42,927 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:39:42,927 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2020-08-21 16:39:42,929 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-21 16:39:42,929 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 28 [2020-08-21 16:39:42,929 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:39:42,930 INFO L225 Difference]: With dead ends: 35 [2020-08-21 16:39:42,930 INFO L226 Difference]: Without dead ends: 30 [2020-08-21 16:39:42,930 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=57, Invalid=363, Unknown=0, NotChecked=0, Total=420 [2020-08-21 16:39:42,931 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-21 16:39:42,934 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-08-21 16:39:42,934 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-08-21 16:39:42,935 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2020-08-21 16:39:42,935 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 28 [2020-08-21 16:39:42,935 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:39:42,935 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2020-08-21 16:39:42,935 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-21 16:39:42,935 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2020-08-21 16:39:42,936 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-08-21 16:39:42,936 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:39:42,936 INFO L422 BasicCegarLoop]: trace histogram [19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:39:42,936 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-21 16:39:42,937 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:39:42,937 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:39:42,937 INFO L82 PathProgramCache]: Analyzing trace with hash -266483215, now seen corresponding path program 19 times [2020-08-21 16:39:42,937 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:39:42,937 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1406741434] [2020-08-21 16:39:42,938 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:39:42,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:43,313 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:39:43,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:43,316 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:39:43,317 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1406741434] [2020-08-21 16:39:43,317 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:39:43,317 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-21 16:39:43,317 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2057299231] [2020-08-21 16:39:43,318 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-21 16:39:43,318 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:39:43,318 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-21 16:39:43,318 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=402, Unknown=0, NotChecked=0, Total=462 [2020-08-21 16:39:43,319 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 22 states. [2020-08-21 16:39:43,593 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:39:43,593 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2020-08-21 16:39:43,594 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-21 16:39:43,594 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 29 [2020-08-21 16:39:43,594 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:39:43,595 INFO L225 Difference]: With dead ends: 36 [2020-08-21 16:39:43,595 INFO L226 Difference]: Without dead ends: 31 [2020-08-21 16:39:43,595 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=60, Invalid=402, Unknown=0, NotChecked=0, Total=462 [2020-08-21 16:39:43,596 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-21 16:39:43,601 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2020-08-21 16:39:43,602 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-21 16:39:43,602 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2020-08-21 16:39:43,602 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 29 [2020-08-21 16:39:43,603 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:39:43,603 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2020-08-21 16:39:43,603 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-21 16:39:43,603 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2020-08-21 16:39:43,604 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-21 16:39:43,604 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:39:43,604 INFO L422 BasicCegarLoop]: trace histogram [20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:39:43,605 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-21 16:39:43,605 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:39:43,605 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:39:43,605 INFO L82 PathProgramCache]: Analyzing trace with hash 365416190, now seen corresponding path program 20 times [2020-08-21 16:39:43,605 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:39:43,606 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1804388943] [2020-08-21 16:39:43,606 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:39:43,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:44,038 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:39:44,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:44,041 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:39:44,042 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1804388943] [2020-08-21 16:39:44,042 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:39:44,042 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-21 16:39:44,042 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1231463860] [2020-08-21 16:39:44,044 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-21 16:39:44,044 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:39:44,045 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-21 16:39:44,046 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2020-08-21 16:39:44,046 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 23 states. [2020-08-21 16:39:44,355 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:39:44,355 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2020-08-21 16:39:44,356 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-21 16:39:44,356 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 30 [2020-08-21 16:39:44,356 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:39:44,357 INFO L225 Difference]: With dead ends: 37 [2020-08-21 16:39:44,357 INFO L226 Difference]: Without dead ends: 32 [2020-08-21 16:39:44,358 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2020-08-21 16:39:44,359 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-21 16:39:44,363 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2020-08-21 16:39:44,363 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-08-21 16:39:44,364 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2020-08-21 16:39:44,364 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 30 [2020-08-21 16:39:44,364 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:39:44,364 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2020-08-21 16:39:44,364 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-21 16:39:44,365 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2020-08-21 16:39:44,365 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-21 16:39:44,365 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:39:44,365 INFO L422 BasicCegarLoop]: trace histogram [21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:39:44,366 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-21 16:39:44,366 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:39:44,366 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:39:44,366 INFO L82 PathProgramCache]: Analyzing trace with hash -1520538735, now seen corresponding path program 21 times [2020-08-21 16:39:44,366 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:39:44,367 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [979599215] [2020-08-21 16:39:44,367 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:39:44,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:44,803 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:39:44,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:44,807 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:39:44,807 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [979599215] [2020-08-21 16:39:44,807 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:39:44,807 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-21 16:39:44,808 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [475235017] [2020-08-21 16:39:44,808 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-21 16:39:44,808 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:39:44,808 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-21 16:39:44,809 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=486, Unknown=0, NotChecked=0, Total=552 [2020-08-21 16:39:44,809 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 24 states. [2020-08-21 16:39:45,167 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:39:45,168 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2020-08-21 16:39:45,170 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-21 16:39:45,170 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 31 [2020-08-21 16:39:45,171 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:39:45,171 INFO L225 Difference]: With dead ends: 38 [2020-08-21 16:39:45,171 INFO L226 Difference]: Without dead ends: 33 [2020-08-21 16:39:45,172 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=66, Invalid=486, Unknown=0, NotChecked=0, Total=552 [2020-08-21 16:39:45,172 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-21 16:39:45,176 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-08-21 16:39:45,176 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-21 16:39:45,176 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2020-08-21 16:39:45,177 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 31 [2020-08-21 16:39:45,177 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:39:45,177 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2020-08-21 16:39:45,177 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-21 16:39:45,177 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2020-08-21 16:39:45,178 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-21 16:39:45,178 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:39:45,178 INFO L422 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:39:45,178 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-21 16:39:45,178 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:39:45,178 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:39:45,179 INFO L82 PathProgramCache]: Analyzing trace with hash 144400734, now seen corresponding path program 22 times [2020-08-21 16:39:45,179 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:39:45,179 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [305460262] [2020-08-21 16:39:45,179 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:39:45,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:45,653 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:39:45,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:45,657 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:39:45,657 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [305460262] [2020-08-21 16:39:45,657 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:39:45,658 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-21 16:39:45,658 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1353646615] [2020-08-21 16:39:45,658 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-21 16:39:45,659 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:39:45,659 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-21 16:39:45,659 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=531, Unknown=0, NotChecked=0, Total=600 [2020-08-21 16:39:45,659 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 25 states. [2020-08-21 16:39:46,033 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:39:46,034 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2020-08-21 16:39:46,034 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-21 16:39:46,034 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 32 [2020-08-21 16:39:46,034 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:39:46,035 INFO L225 Difference]: With dead ends: 39 [2020-08-21 16:39:46,035 INFO L226 Difference]: Without dead ends: 34 [2020-08-21 16:39:46,036 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=69, Invalid=531, Unknown=0, NotChecked=0, Total=600 [2020-08-21 16:39:46,036 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-21 16:39:46,040 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-08-21 16:39:46,040 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-21 16:39:46,040 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2020-08-21 16:39:46,041 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 32 [2020-08-21 16:39:46,041 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:39:46,041 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2020-08-21 16:39:46,041 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-21 16:39:46,041 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2020-08-21 16:39:46,042 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-21 16:39:46,042 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:39:46,042 INFO L422 BasicCegarLoop]: trace histogram [23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:39:46,042 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-21 16:39:46,042 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:39:46,043 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:39:46,043 INFO L82 PathProgramCache]: Analyzing trace with hash 217916721, now seen corresponding path program 23 times [2020-08-21 16:39:46,043 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:39:46,043 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [16333067] [2020-08-21 16:39:46,043 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:39:46,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:46,605 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:39:46,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:46,609 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:39:46,610 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [16333067] [2020-08-21 16:39:46,610 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:39:46,610 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-21 16:39:46,610 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [663324867] [2020-08-21 16:39:46,610 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-21 16:39:46,611 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:39:46,611 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-21 16:39:46,611 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=578, Unknown=0, NotChecked=0, Total=650 [2020-08-21 16:39:46,611 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand 26 states. [2020-08-21 16:39:46,994 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:39:46,994 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2020-08-21 16:39:46,994 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-21 16:39:46,994 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 33 [2020-08-21 16:39:46,995 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:39:46,995 INFO L225 Difference]: With dead ends: 40 [2020-08-21 16:39:46,995 INFO L226 Difference]: Without dead ends: 35 [2020-08-21 16:39:46,995 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=72, Invalid=578, Unknown=0, NotChecked=0, Total=650 [2020-08-21 16:39:46,996 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-21 16:39:47,000 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-08-21 16:39:47,000 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-21 16:39:47,001 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2020-08-21 16:39:47,001 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 33 [2020-08-21 16:39:47,001 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:39:47,001 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2020-08-21 16:39:47,001 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-21 16:39:47,001 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2020-08-21 16:39:47,002 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-21 16:39:47,002 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:39:47,002 INFO L422 BasicCegarLoop]: trace histogram [24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:39:47,002 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-21 16:39:47,002 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:39:47,003 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:39:47,003 INFO L82 PathProgramCache]: Analyzing trace with hash -1798054978, now seen corresponding path program 24 times [2020-08-21 16:39:47,003 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:39:47,003 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [750011319] [2020-08-21 16:39:47,003 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:39:47,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:47,505 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:39:47,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:47,508 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:39:47,508 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [750011319] [2020-08-21 16:39:47,509 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:39:47,509 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-21 16:39:47,509 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2067134812] [2020-08-21 16:39:47,509 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-21 16:39:47,509 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:39:47,509 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-21 16:39:47,510 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=627, Unknown=0, NotChecked=0, Total=702 [2020-08-21 16:39:47,510 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 27 states. [2020-08-21 16:39:47,933 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:39:47,933 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2020-08-21 16:39:47,934 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-21 16:39:47,934 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 34 [2020-08-21 16:39:47,934 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:39:47,935 INFO L225 Difference]: With dead ends: 41 [2020-08-21 16:39:47,935 INFO L226 Difference]: Without dead ends: 36 [2020-08-21 16:39:47,936 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=75, Invalid=627, Unknown=0, NotChecked=0, Total=702 [2020-08-21 16:39:47,936 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-21 16:39:47,941 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-08-21 16:39:47,941 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-21 16:39:47,941 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2020-08-21 16:39:47,942 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 34 [2020-08-21 16:39:47,942 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:39:47,942 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2020-08-21 16:39:47,942 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-21 16:39:47,942 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2020-08-21 16:39:47,943 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-08-21 16:39:47,943 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:39:47,943 INFO L422 BasicCegarLoop]: trace histogram [25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:39:47,943 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-21 16:39:47,943 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:39:47,943 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:39:47,944 INFO L82 PathProgramCache]: Analyzing trace with hash 131331793, now seen corresponding path program 25 times [2020-08-21 16:39:47,944 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:39:47,944 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [720955875] [2020-08-21 16:39:47,944 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:39:47,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:48,522 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:39:48,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:48,527 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:39:48,527 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [720955875] [2020-08-21 16:39:48,527 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:39:48,527 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-21 16:39:48,528 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2009416625] [2020-08-21 16:39:48,529 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-21 16:39:48,530 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:39:48,530 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-21 16:39:48,530 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=678, Unknown=0, NotChecked=0, Total=756 [2020-08-21 16:39:48,531 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 28 states. [2020-08-21 16:39:48,946 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:39:48,947 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2020-08-21 16:39:48,947 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-21 16:39:48,947 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 35 [2020-08-21 16:39:48,948 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:39:48,948 INFO L225 Difference]: With dead ends: 42 [2020-08-21 16:39:48,948 INFO L226 Difference]: Without dead ends: 37 [2020-08-21 16:39:48,949 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=78, Invalid=678, Unknown=0, NotChecked=0, Total=756 [2020-08-21 16:39:48,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-21 16:39:48,959 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-08-21 16:39:48,959 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-21 16:39:48,960 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2020-08-21 16:39:48,960 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 35 [2020-08-21 16:39:48,960 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:39:48,960 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2020-08-21 16:39:48,960 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-21 16:39:48,964 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2020-08-21 16:39:48,965 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-21 16:39:48,965 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:39:48,965 INFO L422 BasicCegarLoop]: trace histogram [26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:39:48,966 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-21 16:39:48,966 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:39:48,966 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:39:48,966 INFO L82 PathProgramCache]: Analyzing trace with hash -187220450, now seen corresponding path program 26 times [2020-08-21 16:39:48,966 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:39:48,967 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [764598285] [2020-08-21 16:39:48,969 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:39:48,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:49,570 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:39:49,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:49,574 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:39:49,574 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [764598285] [2020-08-21 16:39:49,574 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:39:49,575 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-21 16:39:49,575 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1805721247] [2020-08-21 16:39:49,575 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-21 16:39:49,576 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:39:49,576 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-21 16:39:49,576 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=731, Unknown=0, NotChecked=0, Total=812 [2020-08-21 16:39:49,576 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 29 states. [2020-08-21 16:39:50,060 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:39:50,060 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2020-08-21 16:39:50,061 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-21 16:39:50,061 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 36 [2020-08-21 16:39:50,062 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:39:50,062 INFO L225 Difference]: With dead ends: 43 [2020-08-21 16:39:50,062 INFO L226 Difference]: Without dead ends: 38 [2020-08-21 16:39:50,063 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=81, Invalid=731, Unknown=0, NotChecked=0, Total=812 [2020-08-21 16:39:50,063 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-21 16:39:50,067 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-08-21 16:39:50,067 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-21 16:39:50,067 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2020-08-21 16:39:50,068 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 36 [2020-08-21 16:39:50,068 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:39:50,068 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2020-08-21 16:39:50,068 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-21 16:39:50,068 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2020-08-21 16:39:50,069 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-21 16:39:50,069 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:39:50,069 INFO L422 BasicCegarLoop]: trace histogram [27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:39:50,069 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-21 16:39:50,070 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:39:50,070 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:39:50,070 INFO L82 PathProgramCache]: Analyzing trace with hash -1472405391, now seen corresponding path program 27 times [2020-08-21 16:39:50,070 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:39:50,070 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [329228306] [2020-08-21 16:39:50,070 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:39:50,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:50,718 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:39:50,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:50,722 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:39:50,722 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [329228306] [2020-08-21 16:39:50,723 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:39:50,723 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-21 16:39:50,723 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1875522249] [2020-08-21 16:39:50,723 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-21 16:39:50,723 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:39:50,723 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-21 16:39:50,724 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=786, Unknown=0, NotChecked=0, Total=870 [2020-08-21 16:39:50,724 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 30 states. [2020-08-21 16:39:51,204 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:39:51,205 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2020-08-21 16:39:51,205 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-21 16:39:51,205 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 37 [2020-08-21 16:39:51,206 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:39:51,206 INFO L225 Difference]: With dead ends: 44 [2020-08-21 16:39:51,206 INFO L226 Difference]: Without dead ends: 39 [2020-08-21 16:39:51,207 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=84, Invalid=786, Unknown=0, NotChecked=0, Total=870 [2020-08-21 16:39:51,207 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-21 16:39:51,210 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-08-21 16:39:51,210 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-21 16:39:51,210 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2020-08-21 16:39:51,211 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 37 [2020-08-21 16:39:51,211 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:39:51,211 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2020-08-21 16:39:51,211 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-21 16:39:51,211 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2020-08-21 16:39:51,211 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-21 16:39:51,211 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:39:51,212 INFO L422 BasicCegarLoop]: trace histogram [28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:39:51,212 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-21 16:39:51,212 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:39:51,212 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:39:51,212 INFO L82 PathProgramCache]: Analyzing trace with hash 1636534398, now seen corresponding path program 28 times [2020-08-21 16:39:51,212 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:39:51,213 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1513265134] [2020-08-21 16:39:51,213 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:39:51,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:51,944 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:39:51,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:51,949 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:39:51,950 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1513265134] [2020-08-21 16:39:51,950 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:39:51,950 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-21 16:39:51,950 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1906997771] [2020-08-21 16:39:51,950 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-21 16:39:51,951 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:39:51,951 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-21 16:39:51,951 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=843, Unknown=0, NotChecked=0, Total=930 [2020-08-21 16:39:51,951 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 31 states. [2020-08-21 16:39:52,486 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:39:52,486 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2020-08-21 16:39:52,486 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-21 16:39:52,487 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 38 [2020-08-21 16:39:52,487 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:39:52,487 INFO L225 Difference]: With dead ends: 45 [2020-08-21 16:39:52,487 INFO L226 Difference]: Without dead ends: 40 [2020-08-21 16:39:52,489 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=87, Invalid=843, Unknown=0, NotChecked=0, Total=930 [2020-08-21 16:39:52,489 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-21 16:39:52,492 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2020-08-21 16:39:52,492 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-21 16:39:52,493 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 40 transitions. [2020-08-21 16:39:52,493 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 40 transitions. Word has length 38 [2020-08-21 16:39:52,493 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:39:52,493 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 40 transitions. [2020-08-21 16:39:52,493 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-21 16:39:52,493 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 40 transitions. [2020-08-21 16:39:52,494 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-21 16:39:52,494 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:39:52,494 INFO L422 BasicCegarLoop]: trace histogram [29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:39:52,494 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-21 16:39:52,494 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:39:52,494 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:39:52,495 INFO L82 PathProgramCache]: Analyzing trace with hash -770579951, now seen corresponding path program 29 times [2020-08-21 16:39:52,495 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:39:52,495 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1768482858] [2020-08-21 16:39:52,495 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:39:52,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:53,196 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:39:53,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:53,199 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:39:53,199 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1768482858] [2020-08-21 16:39:53,199 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:39:53,199 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-21 16:39:53,200 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [16254897] [2020-08-21 16:39:53,200 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-21 16:39:53,200 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:39:53,200 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-21 16:39:53,200 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=902, Unknown=0, NotChecked=0, Total=992 [2020-08-21 16:39:53,201 INFO L87 Difference]: Start difference. First operand 40 states and 40 transitions. Second operand 32 states. [2020-08-21 16:39:53,752 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:39:53,752 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2020-08-21 16:39:53,758 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-21 16:39:53,758 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 39 [2020-08-21 16:39:53,758 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:39:53,759 INFO L225 Difference]: With dead ends: 46 [2020-08-21 16:39:53,759 INFO L226 Difference]: Without dead ends: 41 [2020-08-21 16:39:53,760 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=90, Invalid=902, Unknown=0, NotChecked=0, Total=992 [2020-08-21 16:39:53,760 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-21 16:39:53,766 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-08-21 16:39:53,766 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-21 16:39:53,767 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2020-08-21 16:39:53,767 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 39 [2020-08-21 16:39:53,767 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:39:53,767 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2020-08-21 16:39:53,767 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-21 16:39:53,767 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2020-08-21 16:39:53,768 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-21 16:39:53,768 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:39:53,768 INFO L422 BasicCegarLoop]: trace histogram [30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:39:53,768 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-21 16:39:53,769 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:39:53,774 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:39:53,774 INFO L82 PathProgramCache]: Analyzing trace with hash 1918286558, now seen corresponding path program 30 times [2020-08-21 16:39:53,774 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:39:53,774 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1930575142] [2020-08-21 16:39:53,774 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:39:53,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:54,524 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:39:54,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:54,529 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:39:54,529 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1930575142] [2020-08-21 16:39:54,529 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:39:54,529 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-21 16:39:54,529 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [772945626] [2020-08-21 16:39:54,530 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-21 16:39:54,530 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:39:54,530 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-21 16:39:54,530 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=963, Unknown=0, NotChecked=0, Total=1056 [2020-08-21 16:39:54,531 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 33 states. [2020-08-21 16:39:55,140 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:39:55,141 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2020-08-21 16:39:55,143 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-21 16:39:55,144 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 40 [2020-08-21 16:39:55,144 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:39:55,144 INFO L225 Difference]: With dead ends: 47 [2020-08-21 16:39:55,144 INFO L226 Difference]: Without dead ends: 42 [2020-08-21 16:39:55,145 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=93, Invalid=963, Unknown=0, NotChecked=0, Total=1056 [2020-08-21 16:39:55,145 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-21 16:39:55,148 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-08-21 16:39:55,148 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-21 16:39:55,149 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2020-08-21 16:39:55,149 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 40 [2020-08-21 16:39:55,149 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:39:55,149 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2020-08-21 16:39:55,150 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-21 16:39:55,150 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2020-08-21 16:39:55,150 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-21 16:39:55,150 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:39:55,151 INFO L422 BasicCegarLoop]: trace histogram [31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:39:55,151 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-21 16:39:55,151 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:39:55,151 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:39:55,151 INFO L82 PathProgramCache]: Analyzing trace with hash -626197583, now seen corresponding path program 31 times [2020-08-21 16:39:55,151 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:39:55,152 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [817113663] [2020-08-21 16:39:55,152 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:39:55,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:55,951 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:39:55,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:55,957 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:39:55,957 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [817113663] [2020-08-21 16:39:55,957 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:39:55,958 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-21 16:39:55,958 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1951067249] [2020-08-21 16:39:55,958 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-21 16:39:55,958 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:39:55,959 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-21 16:39:55,959 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=1026, Unknown=0, NotChecked=0, Total=1122 [2020-08-21 16:39:55,959 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand 34 states. [2020-08-21 16:39:56,603 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:39:56,603 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2020-08-21 16:39:56,604 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-21 16:39:56,604 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 41 [2020-08-21 16:39:56,604 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:39:56,605 INFO L225 Difference]: With dead ends: 48 [2020-08-21 16:39:56,605 INFO L226 Difference]: Without dead ends: 43 [2020-08-21 16:39:56,606 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=96, Invalid=1026, Unknown=0, NotChecked=0, Total=1122 [2020-08-21 16:39:56,606 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-21 16:39:56,609 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-08-21 16:39:56,610 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-21 16:39:56,610 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2020-08-21 16:39:56,610 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 41 [2020-08-21 16:39:56,610 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:39:56,611 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2020-08-21 16:39:56,611 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-21 16:39:56,611 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2020-08-21 16:39:56,611 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-21 16:39:56,611 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:39:56,611 INFO L422 BasicCegarLoop]: trace histogram [32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:39:56,612 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-21 16:39:56,612 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:39:56,612 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:39:56,612 INFO L82 PathProgramCache]: Analyzing trace with hash 2099172670, now seen corresponding path program 32 times [2020-08-21 16:39:56,612 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:39:56,613 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2073456224] [2020-08-21 16:39:56,613 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:39:56,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:57,392 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:39:57,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:57,397 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:39:57,397 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2073456224] [2020-08-21 16:39:57,397 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:39:57,398 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-21 16:39:57,398 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1660916545] [2020-08-21 16:39:57,398 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-21 16:39:57,398 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:39:57,398 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-21 16:39:57,399 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=1091, Unknown=0, NotChecked=0, Total=1190 [2020-08-21 16:39:57,399 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 35 states. [2020-08-21 16:39:58,079 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:39:58,079 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2020-08-21 16:39:58,079 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-21 16:39:58,079 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 42 [2020-08-21 16:39:58,080 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:39:58,080 INFO L225 Difference]: With dead ends: 49 [2020-08-21 16:39:58,080 INFO L226 Difference]: Without dead ends: 44 [2020-08-21 16:39:58,081 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=99, Invalid=1091, Unknown=0, NotChecked=0, Total=1190 [2020-08-21 16:39:58,081 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-21 16:39:58,085 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-08-21 16:39:58,085 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-21 16:39:58,085 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2020-08-21 16:39:58,085 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 42 [2020-08-21 16:39:58,086 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:39:58,086 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2020-08-21 16:39:58,086 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-21 16:39:58,086 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2020-08-21 16:39:58,086 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-21 16:39:58,087 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:39:58,087 INFO L422 BasicCegarLoop]: trace histogram [33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:39:58,087 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-21 16:39:58,087 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:39:58,087 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:39:58,087 INFO L82 PathProgramCache]: Analyzing trace with hash 686304593, now seen corresponding path program 33 times [2020-08-21 16:39:58,088 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:39:58,088 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2106627737] [2020-08-21 16:39:58,088 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:39:58,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:58,881 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:39:58,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:58,885 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:39:58,886 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2106627737] [2020-08-21 16:39:58,886 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:39:58,886 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-21 16:39:58,886 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [180067805] [2020-08-21 16:39:58,886 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-21 16:39:58,886 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:39:58,887 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-21 16:39:58,887 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=1158, Unknown=0, NotChecked=0, Total=1260 [2020-08-21 16:39:58,887 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 36 states. [2020-08-21 16:39:59,611 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:39:59,611 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2020-08-21 16:39:59,612 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-21 16:39:59,612 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 43 [2020-08-21 16:39:59,612 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:39:59,613 INFO L225 Difference]: With dead ends: 50 [2020-08-21 16:39:59,613 INFO L226 Difference]: Without dead ends: 45 [2020-08-21 16:39:59,613 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=102, Invalid=1158, Unknown=0, NotChecked=0, Total=1260 [2020-08-21 16:39:59,614 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-08-21 16:39:59,617 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2020-08-21 16:39:59,617 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-21 16:39:59,618 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2020-08-21 16:39:59,618 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 43 [2020-08-21 16:39:59,618 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:39:59,618 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2020-08-21 16:39:59,618 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-21 16:39:59,618 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2020-08-21 16:39:59,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-21 16:39:59,619 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:39:59,619 INFO L422 BasicCegarLoop]: trace histogram [34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:39:59,619 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-21 16:39:59,619 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:39:59,619 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:39:59,619 INFO L82 PathProgramCache]: Analyzing trace with hash -162932834, now seen corresponding path program 34 times [2020-08-21 16:39:59,620 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:39:59,620 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1373884335] [2020-08-21 16:39:59,620 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:39:59,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:00,536 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:40:00,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:00,541 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:40:00,542 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1373884335] [2020-08-21 16:40:00,542 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:40:00,542 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-21 16:40:00,542 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1379816090] [2020-08-21 16:40:00,543 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-21 16:40:00,543 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:40:00,543 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-21 16:40:00,543 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=1227, Unknown=0, NotChecked=0, Total=1332 [2020-08-21 16:40:00,544 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 37 states. [2020-08-21 16:40:01,346 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:40:01,346 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2020-08-21 16:40:01,346 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-21 16:40:01,347 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 44 [2020-08-21 16:40:01,347 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:40:01,347 INFO L225 Difference]: With dead ends: 51 [2020-08-21 16:40:01,348 INFO L226 Difference]: Without dead ends: 46 [2020-08-21 16:40:01,349 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=105, Invalid=1227, Unknown=0, NotChecked=0, Total=1332 [2020-08-21 16:40:01,349 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-21 16:40:01,352 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2020-08-21 16:40:01,352 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-21 16:40:01,353 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 46 transitions. [2020-08-21 16:40:01,353 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 46 transitions. Word has length 44 [2020-08-21 16:40:01,353 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:40:01,353 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 46 transitions. [2020-08-21 16:40:01,353 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-21 16:40:01,353 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 46 transitions. [2020-08-21 16:40:01,354 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-08-21 16:40:01,354 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:40:01,354 INFO L422 BasicCegarLoop]: trace histogram [35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:40:01,354 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-21 16:40:01,354 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:40:01,354 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:40:01,355 INFO L82 PathProgramCache]: Analyzing trace with hash -719489295, now seen corresponding path program 35 times [2020-08-21 16:40:01,355 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:40:01,355 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1762357384] [2020-08-21 16:40:01,355 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:40:01,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:02,415 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:40:02,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:02,420 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:40:02,420 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1762357384] [2020-08-21 16:40:02,420 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:40:02,420 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-21 16:40:02,420 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1768429129] [2020-08-21 16:40:02,421 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-21 16:40:02,421 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:40:02,421 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-21 16:40:02,421 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=1298, Unknown=0, NotChecked=0, Total=1406 [2020-08-21 16:40:02,421 INFO L87 Difference]: Start difference. First operand 46 states and 46 transitions. Second operand 38 states. [2020-08-21 16:40:03,252 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:40:03,253 INFO L93 Difference]: Finished difference Result 52 states and 52 transitions. [2020-08-21 16:40:03,253 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-21 16:40:03,253 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 45 [2020-08-21 16:40:03,253 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:40:03,254 INFO L225 Difference]: With dead ends: 52 [2020-08-21 16:40:03,254 INFO L226 Difference]: Without dead ends: 47 [2020-08-21 16:40:03,255 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=108, Invalid=1298, Unknown=0, NotChecked=0, Total=1406 [2020-08-21 16:40:03,255 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-21 16:40:03,258 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2020-08-21 16:40:03,258 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-21 16:40:03,258 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2020-08-21 16:40:03,259 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 45 [2020-08-21 16:40:03,259 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:40:03,259 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2020-08-21 16:40:03,259 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-21 16:40:03,259 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2020-08-21 16:40:03,259 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-21 16:40:03,259 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:40:03,260 INFO L422 BasicCegarLoop]: trace histogram [36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:40:03,260 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-21 16:40:03,260 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:40:03,260 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:40:03,260 INFO L82 PathProgramCache]: Analyzing trace with hash -792870402, now seen corresponding path program 36 times [2020-08-21 16:40:03,260 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:40:03,260 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [213317704] [2020-08-21 16:40:03,260 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:40:03,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:04,313 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:40:04,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:04,319 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:40:04,319 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [213317704] [2020-08-21 16:40:04,319 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:40:04,320 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-21 16:40:04,320 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [328040066] [2020-08-21 16:40:04,321 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-21 16:40:04,321 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:40:04,321 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-21 16:40:04,322 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=1371, Unknown=0, NotChecked=0, Total=1482 [2020-08-21 16:40:04,322 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 39 states. [2020-08-21 16:40:05,141 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:40:05,142 INFO L93 Difference]: Finished difference Result 53 states and 53 transitions. [2020-08-21 16:40:05,143 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-21 16:40:05,143 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 46 [2020-08-21 16:40:05,143 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:40:05,144 INFO L225 Difference]: With dead ends: 53 [2020-08-21 16:40:05,144 INFO L226 Difference]: Without dead ends: 48 [2020-08-21 16:40:05,145 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=111, Invalid=1371, Unknown=0, NotChecked=0, Total=1482 [2020-08-21 16:40:05,145 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-21 16:40:05,148 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-08-21 16:40:05,148 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-21 16:40:05,149 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 48 transitions. [2020-08-21 16:40:05,149 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 48 transitions. Word has length 46 [2020-08-21 16:40:05,149 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:40:05,149 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 48 transitions. [2020-08-21 16:40:05,149 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-21 16:40:05,149 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 48 transitions. [2020-08-21 16:40:05,150 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-08-21 16:40:05,150 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:40:05,150 INFO L422 BasicCegarLoop]: trace histogram [37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:40:05,150 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-21 16:40:05,151 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:40:05,151 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:40:05,151 INFO L82 PathProgramCache]: Analyzing trace with hash 1227282577, now seen corresponding path program 37 times [2020-08-21 16:40:05,151 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:40:05,151 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [597917889] [2020-08-21 16:40:05,151 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:40:05,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:06,223 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:40:06,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:06,229 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:40:06,229 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [597917889] [2020-08-21 16:40:06,229 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:40:06,229 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-21 16:40:06,229 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [484384399] [2020-08-21 16:40:06,230 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-21 16:40:06,230 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:40:06,230 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-21 16:40:06,231 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=1446, Unknown=0, NotChecked=0, Total=1560 [2020-08-21 16:40:06,231 INFO L87 Difference]: Start difference. First operand 48 states and 48 transitions. Second operand 40 states. [2020-08-21 16:40:07,141 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:40:07,142 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2020-08-21 16:40:07,142 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-21 16:40:07,142 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 47 [2020-08-21 16:40:07,143 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:40:07,143 INFO L225 Difference]: With dead ends: 54 [2020-08-21 16:40:07,143 INFO L226 Difference]: Without dead ends: 49 [2020-08-21 16:40:07,144 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=114, Invalid=1446, Unknown=0, NotChecked=0, Total=1560 [2020-08-21 16:40:07,145 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-21 16:40:07,148 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-21 16:40:07,149 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-21 16:40:07,149 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2020-08-21 16:40:07,149 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 47 [2020-08-21 16:40:07,149 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:40:07,149 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2020-08-21 16:40:07,150 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-21 16:40:07,150 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2020-08-21 16:40:07,150 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-21 16:40:07,150 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:40:07,150 INFO L422 BasicCegarLoop]: trace histogram [38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:40:07,151 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-21 16:40:07,151 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:40:07,151 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:40:07,151 INFO L82 PathProgramCache]: Analyzing trace with hash -572484514, now seen corresponding path program 38 times [2020-08-21 16:40:07,151 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:40:07,151 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [190359328] [2020-08-21 16:40:07,152 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:40:07,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:08,254 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:40:08,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:08,260 INFO L134 CoverageAnalysis]: Checked inductivity of 741 backedges. 0 proven. 741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:40:08,261 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [190359328] [2020-08-21 16:40:08,261 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:40:08,261 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-21 16:40:08,261 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [536313408] [2020-08-21 16:40:08,262 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-21 16:40:08,262 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:40:08,262 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-21 16:40:08,263 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=1523, Unknown=0, NotChecked=0, Total=1640 [2020-08-21 16:40:08,263 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand 41 states. [2020-08-21 16:40:09,243 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:40:09,244 INFO L93 Difference]: Finished difference Result 55 states and 55 transitions. [2020-08-21 16:40:09,244 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-21 16:40:09,244 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 48 [2020-08-21 16:40:09,245 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:40:09,245 INFO L225 Difference]: With dead ends: 55 [2020-08-21 16:40:09,245 INFO L226 Difference]: Without dead ends: 50 [2020-08-21 16:40:09,246 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=117, Invalid=1523, Unknown=0, NotChecked=0, Total=1640 [2020-08-21 16:40:09,246 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-08-21 16:40:09,249 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2020-08-21 16:40:09,249 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-08-21 16:40:09,249 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 50 transitions. [2020-08-21 16:40:09,250 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 50 transitions. Word has length 48 [2020-08-21 16:40:09,250 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:40:09,250 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 50 transitions. [2020-08-21 16:40:09,250 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-21 16:40:09,250 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 50 transitions. [2020-08-21 16:40:09,250 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-08-21 16:40:09,251 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:40:09,251 INFO L422 BasicCegarLoop]: trace histogram [39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:40:09,251 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-21 16:40:09,251 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:40:09,251 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:40:09,251 INFO L82 PathProgramCache]: Analyzing trace with hash -530689487, now seen corresponding path program 39 times [2020-08-21 16:40:09,252 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:40:09,252 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1341632592] [2020-08-21 16:40:09,252 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:40:09,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:10,487 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:40:10,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:10,493 INFO L134 CoverageAnalysis]: Checked inductivity of 780 backedges. 0 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:40:10,493 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1341632592] [2020-08-21 16:40:10,493 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:40:10,493 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-21 16:40:10,493 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [633301472] [2020-08-21 16:40:10,494 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-21 16:40:10,494 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:40:10,494 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-21 16:40:10,495 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=1602, Unknown=0, NotChecked=0, Total=1722 [2020-08-21 16:40:10,495 INFO L87 Difference]: Start difference. First operand 50 states and 50 transitions. Second operand 42 states. [2020-08-21 16:40:11,487 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:40:11,488 INFO L93 Difference]: Finished difference Result 56 states and 56 transitions. [2020-08-21 16:40:11,488 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-21 16:40:11,488 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 49 [2020-08-21 16:40:11,489 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:40:11,489 INFO L225 Difference]: With dead ends: 56 [2020-08-21 16:40:11,489 INFO L226 Difference]: Without dead ends: 51 [2020-08-21 16:40:11,490 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=120, Invalid=1602, Unknown=0, NotChecked=0, Total=1722 [2020-08-21 16:40:11,490 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-08-21 16:40:11,492 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2020-08-21 16:40:11,492 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-21 16:40:11,492 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2020-08-21 16:40:11,493 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 49 [2020-08-21 16:40:11,493 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:40:11,493 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2020-08-21 16:40:11,493 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-21 16:40:11,493 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2020-08-21 16:40:11,493 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-21 16:40:11,493 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:40:11,493 INFO L422 BasicCegarLoop]: trace histogram [40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:40:11,494 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-21 16:40:11,494 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:40:11,494 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:40:11,494 INFO L82 PathProgramCache]: Analyzing trace with hash 764956350, now seen corresponding path program 40 times [2020-08-21 16:40:11,494 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:40:11,494 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1829207279] [2020-08-21 16:40:11,494 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:40:11,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:12,750 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:40:12,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:12,755 INFO L134 CoverageAnalysis]: Checked inductivity of 820 backedges. 0 proven. 820 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:40:12,755 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1829207279] [2020-08-21 16:40:12,755 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:40:12,756 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-21 16:40:12,756 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [271504528] [2020-08-21 16:40:12,756 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-21 16:40:12,756 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:40:12,756 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-21 16:40:12,757 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=1683, Unknown=0, NotChecked=0, Total=1806 [2020-08-21 16:40:12,757 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 43 states. [2020-08-21 16:40:13,805 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:40:13,805 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2020-08-21 16:40:13,806 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-08-21 16:40:13,806 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 50 [2020-08-21 16:40:13,806 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:40:13,807 INFO L225 Difference]: With dead ends: 57 [2020-08-21 16:40:13,807 INFO L226 Difference]: Without dead ends: 52 [2020-08-21 16:40:13,808 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=123, Invalid=1683, Unknown=0, NotChecked=0, Total=1806 [2020-08-21 16:40:13,809 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-21 16:40:13,814 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2020-08-21 16:40:13,814 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-08-21 16:40:13,814 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 52 transitions. [2020-08-21 16:40:13,815 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 52 transitions. Word has length 50 [2020-08-21 16:40:13,815 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:40:13,815 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 52 transitions. [2020-08-21 16:40:13,815 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-21 16:40:13,815 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 52 transitions. [2020-08-21 16:40:13,816 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-08-21 16:40:13,816 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:40:13,816 INFO L422 BasicCegarLoop]: trace histogram [41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:40:13,816 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-21 16:40:13,816 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:40:13,816 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:40:13,817 INFO L82 PathProgramCache]: Analyzing trace with hash -2019695663, now seen corresponding path program 41 times [2020-08-21 16:40:13,817 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:40:13,817 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1330938533] [2020-08-21 16:40:13,817 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:40:13,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:15,079 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:40:15,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:15,085 INFO L134 CoverageAnalysis]: Checked inductivity of 861 backedges. 0 proven. 861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:40:15,085 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1330938533] [2020-08-21 16:40:15,085 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:40:15,085 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44] total 44 [2020-08-21 16:40:15,085 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [857856803] [2020-08-21 16:40:15,086 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-08-21 16:40:15,086 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:40:15,086 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-08-21 16:40:15,087 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=1766, Unknown=0, NotChecked=0, Total=1892 [2020-08-21 16:40:15,087 INFO L87 Difference]: Start difference. First operand 52 states and 52 transitions. Second operand 44 states. [2020-08-21 16:40:16,203 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:40:16,203 INFO L93 Difference]: Finished difference Result 58 states and 58 transitions. [2020-08-21 16:40:16,204 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-08-21 16:40:16,204 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 51 [2020-08-21 16:40:16,204 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:40:16,205 INFO L225 Difference]: With dead ends: 58 [2020-08-21 16:40:16,205 INFO L226 Difference]: Without dead ends: 53 [2020-08-21 16:40:16,206 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=126, Invalid=1766, Unknown=0, NotChecked=0, Total=1892 [2020-08-21 16:40:16,207 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-08-21 16:40:16,209 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2020-08-21 16:40:16,210 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-21 16:40:16,210 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2020-08-21 16:40:16,210 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 51 [2020-08-21 16:40:16,210 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:40:16,211 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2020-08-21 16:40:16,211 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-08-21 16:40:16,211 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2020-08-21 16:40:16,211 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-21 16:40:16,211 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:40:16,211 INFO L422 BasicCegarLoop]: trace histogram [42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:40:16,211 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-08-21 16:40:16,212 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:40:16,212 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:40:16,212 INFO L82 PathProgramCache]: Analyzing trace with hash 1850405150, now seen corresponding path program 42 times [2020-08-21 16:40:16,212 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:40:16,212 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1034853716] [2020-08-21 16:40:16,213 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:40:16,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:17,570 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:40:17,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:17,578 INFO L134 CoverageAnalysis]: Checked inductivity of 903 backedges. 0 proven. 903 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:40:17,578 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1034853716] [2020-08-21 16:40:17,580 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:40:17,581 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45] total 45 [2020-08-21 16:40:17,581 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1009822327] [2020-08-21 16:40:17,581 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2020-08-21 16:40:17,581 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:40:17,582 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2020-08-21 16:40:17,583 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=1851, Unknown=0, NotChecked=0, Total=1980 [2020-08-21 16:40:17,583 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 45 states. [2020-08-21 16:40:18,769 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:40:18,769 INFO L93 Difference]: Finished difference Result 59 states and 59 transitions. [2020-08-21 16:40:18,773 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2020-08-21 16:40:18,773 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 52 [2020-08-21 16:40:18,773 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:40:18,774 INFO L225 Difference]: With dead ends: 59 [2020-08-21 16:40:18,774 INFO L226 Difference]: Without dead ends: 54 [2020-08-21 16:40:18,776 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=129, Invalid=1851, Unknown=0, NotChecked=0, Total=1980 [2020-08-21 16:40:18,782 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-21 16:40:18,785 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2020-08-21 16:40:18,785 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-08-21 16:40:18,787 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 54 transitions. [2020-08-21 16:40:18,787 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 54 transitions. Word has length 52 [2020-08-21 16:40:18,787 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:40:18,787 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 54 transitions. [2020-08-21 16:40:18,787 INFO L480 AbstractCegarLoop]: Interpolant automaton has 45 states. [2020-08-21 16:40:18,787 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 54 transitions. [2020-08-21 16:40:18,789 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-08-21 16:40:18,789 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:40:18,790 INFO L422 BasicCegarLoop]: trace histogram [43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:40:18,790 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2020-08-21 16:40:18,790 INFO L427 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:40:18,790 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:40:18,790 INFO L82 PathProgramCache]: Analyzing trace with hash 1564446065, now seen corresponding path program 43 times [2020-08-21 16:40:18,790 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:40:18,791 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1503266952] [2020-08-21 16:40:18,791 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:40:18,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:20,213 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:40:20,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:20,220 INFO L134 CoverageAnalysis]: Checked inductivity of 946 backedges. 0 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:40:20,220 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1503266952] [2020-08-21 16:40:20,220 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:40:20,220 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46] total 46 [2020-08-21 16:40:20,220 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1244274676] [2020-08-21 16:40:20,221 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2020-08-21 16:40:20,221 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:40:20,221 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2020-08-21 16:40:20,222 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=1938, Unknown=0, NotChecked=0, Total=2070 [2020-08-21 16:40:20,222 INFO L87 Difference]: Start difference. First operand 54 states and 54 transitions. Second operand 46 states. [2020-08-21 16:40:21,443 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:40:21,444 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2020-08-21 16:40:21,444 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2020-08-21 16:40:21,444 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 53 [2020-08-21 16:40:21,445 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:40:21,445 INFO L225 Difference]: With dead ends: 60 [2020-08-21 16:40:21,445 INFO L226 Difference]: Without dead ends: 55 [2020-08-21 16:40:21,446 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=132, Invalid=1938, Unknown=0, NotChecked=0, Total=2070 [2020-08-21 16:40:21,447 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-08-21 16:40:21,449 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2020-08-21 16:40:21,449 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-21 16:40:21,450 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2020-08-21 16:40:21,450 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 53 [2020-08-21 16:40:21,450 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:40:21,450 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2020-08-21 16:40:21,450 INFO L480 AbstractCegarLoop]: Interpolant automaton has 46 states. [2020-08-21 16:40:21,450 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2020-08-21 16:40:21,450 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-21 16:40:21,451 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:40:21,451 INFO L422 BasicCegarLoop]: trace histogram [44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:40:21,451 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2020-08-21 16:40:21,451 INFO L427 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:40:21,451 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:40:21,451 INFO L82 PathProgramCache]: Analyzing trace with hash 1289649022, now seen corresponding path program 44 times [2020-08-21 16:40:21,451 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:40:21,451 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [781185035] [2020-08-21 16:40:21,452 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:40:21,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:22,898 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:40:22,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:22,904 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 990 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:40:22,904 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [781185035] [2020-08-21 16:40:22,905 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:40:22,905 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47] total 47 [2020-08-21 16:40:22,905 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [56848042] [2020-08-21 16:40:22,905 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2020-08-21 16:40:22,905 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:40:22,905 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2020-08-21 16:40:22,906 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=2027, Unknown=0, NotChecked=0, Total=2162 [2020-08-21 16:40:22,906 INFO L87 Difference]: Start difference. First operand 55 states and 55 transitions. Second operand 47 states. [2020-08-21 16:40:24,179 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:40:24,179 INFO L93 Difference]: Finished difference Result 61 states and 61 transitions. [2020-08-21 16:40:24,180 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2020-08-21 16:40:24,180 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 54 [2020-08-21 16:40:24,180 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:40:24,180 INFO L225 Difference]: With dead ends: 61 [2020-08-21 16:40:24,181 INFO L226 Difference]: Without dead ends: 56 [2020-08-21 16:40:24,181 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=135, Invalid=2027, Unknown=0, NotChecked=0, Total=2162 [2020-08-21 16:40:24,181 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-08-21 16:40:24,184 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2020-08-21 16:40:24,184 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-08-21 16:40:24,185 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 56 transitions. [2020-08-21 16:40:24,185 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 56 transitions. Word has length 54 [2020-08-21 16:40:24,185 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:40:24,185 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 56 transitions. [2020-08-21 16:40:24,186 INFO L480 AbstractCegarLoop]: Interpolant automaton has 47 states. [2020-08-21 16:40:24,186 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 56 transitions. [2020-08-21 16:40:24,186 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-08-21 16:40:24,186 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:40:24,186 INFO L422 BasicCegarLoop]: trace histogram [45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:40:24,186 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2020-08-21 16:40:24,187 INFO L427 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:40:24,187 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:40:24,187 INFO L82 PathProgramCache]: Analyzing trace with hash 1360875281, now seen corresponding path program 45 times [2020-08-21 16:40:24,187 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:40:24,187 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [478243775] [2020-08-21 16:40:24,187 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:40:24,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:25,744 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:40:25,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:25,750 INFO L134 CoverageAnalysis]: Checked inductivity of 1035 backedges. 0 proven. 1035 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:40:25,750 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [478243775] [2020-08-21 16:40:25,750 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:40:25,751 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48] total 48 [2020-08-21 16:40:25,751 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1715558454] [2020-08-21 16:40:25,751 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-08-21 16:40:25,751 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:40:25,751 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-08-21 16:40:25,751 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=2118, Unknown=0, NotChecked=0, Total=2256 [2020-08-21 16:40:25,752 INFO L87 Difference]: Start difference. First operand 56 states and 56 transitions. Second operand 48 states. [2020-08-21 16:40:27,025 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:40:27,025 INFO L93 Difference]: Finished difference Result 62 states and 62 transitions. [2020-08-21 16:40:27,025 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-08-21 16:40:27,026 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 55 [2020-08-21 16:40:27,026 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:40:27,026 INFO L225 Difference]: With dead ends: 62 [2020-08-21 16:40:27,027 INFO L226 Difference]: Without dead ends: 57 [2020-08-21 16:40:27,027 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=138, Invalid=2118, Unknown=0, NotChecked=0, Total=2256 [2020-08-21 16:40:27,027 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-08-21 16:40:27,030 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2020-08-21 16:40:27,030 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-21 16:40:27,031 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2020-08-21 16:40:27,031 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 55 [2020-08-21 16:40:27,031 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:40:27,031 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2020-08-21 16:40:27,031 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-08-21 16:40:27,031 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2020-08-21 16:40:27,032 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-21 16:40:27,032 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:40:27,032 INFO L422 BasicCegarLoop]: trace histogram [46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:40:27,032 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2020-08-21 16:40:27,032 INFO L427 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:40:27,032 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:40:27,033 INFO L82 PathProgramCache]: Analyzing trace with hash -726077986, now seen corresponding path program 46 times [2020-08-21 16:40:27,033 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:40:27,033 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [536810586] [2020-08-21 16:40:27,033 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:40:27,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:28,687 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:40:28,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:28,696 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:40:28,696 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [536810586] [2020-08-21 16:40:28,696 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:40:28,696 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49] total 49 [2020-08-21 16:40:28,697 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [929047586] [2020-08-21 16:40:28,697 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2020-08-21 16:40:28,697 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:40:28,697 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2020-08-21 16:40:28,698 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=2211, Unknown=0, NotChecked=0, Total=2352 [2020-08-21 16:40:28,698 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 49 states. [2020-08-21 16:40:30,053 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:40:30,054 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2020-08-21 16:40:30,054 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2020-08-21 16:40:30,054 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 56 [2020-08-21 16:40:30,055 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:40:30,055 INFO L225 Difference]: With dead ends: 63 [2020-08-21 16:40:30,055 INFO L226 Difference]: Without dead ends: 58 [2020-08-21 16:40:30,056 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=141, Invalid=2211, Unknown=0, NotChecked=0, Total=2352 [2020-08-21 16:40:30,056 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-21 16:40:30,060 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2020-08-21 16:40:30,060 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-08-21 16:40:30,060 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 58 transitions. [2020-08-21 16:40:30,060 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 58 transitions. Word has length 56 [2020-08-21 16:40:30,061 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:40:30,061 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 58 transitions. [2020-08-21 16:40:30,061 INFO L480 AbstractCegarLoop]: Interpolant automaton has 49 states. [2020-08-21 16:40:30,061 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 58 transitions. [2020-08-21 16:40:30,061 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-08-21 16:40:30,061 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:40:30,062 INFO L422 BasicCegarLoop]: trace histogram [47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:40:30,062 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2020-08-21 16:40:30,062 INFO L427 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:40:30,062 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:40:30,062 INFO L82 PathProgramCache]: Analyzing trace with hash -997119823, now seen corresponding path program 47 times [2020-08-21 16:40:30,062 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:40:30,062 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1857151780] [2020-08-21 16:40:30,063 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:40:30,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:31,731 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:40:31,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:31,745 INFO L134 CoverageAnalysis]: Checked inductivity of 1128 backedges. 0 proven. 1128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:40:31,745 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1857151780] [2020-08-21 16:40:31,746 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:40:31,746 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50] total 50 [2020-08-21 16:40:31,746 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1160254298] [2020-08-21 16:40:31,746 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-08-21 16:40:31,747 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:40:31,747 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-08-21 16:40:31,748 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=144, Invalid=2306, Unknown=0, NotChecked=0, Total=2450 [2020-08-21 16:40:31,751 INFO L87 Difference]: Start difference. First operand 58 states and 58 transitions. Second operand 50 states. [2020-08-21 16:40:33,169 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:40:33,169 INFO L93 Difference]: Finished difference Result 64 states and 64 transitions. [2020-08-21 16:40:33,171 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2020-08-21 16:40:33,172 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 57 [2020-08-21 16:40:33,172 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:40:33,172 INFO L225 Difference]: With dead ends: 64 [2020-08-21 16:40:33,172 INFO L226 Difference]: Without dead ends: 59 [2020-08-21 16:40:33,173 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=144, Invalid=2306, Unknown=0, NotChecked=0, Total=2450 [2020-08-21 16:40:33,173 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-08-21 16:40:33,176 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2020-08-21 16:40:33,177 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-08-21 16:40:33,177 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 59 transitions. [2020-08-21 16:40:33,177 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 59 transitions. Word has length 57 [2020-08-21 16:40:33,177 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:40:33,177 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 59 transitions. [2020-08-21 16:40:33,178 INFO L480 AbstractCegarLoop]: Interpolant automaton has 50 states. [2020-08-21 16:40:33,178 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 59 transitions. [2020-08-21 16:40:33,178 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-08-21 16:40:33,178 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:40:33,178 INFO L422 BasicCegarLoop]: trace histogram [48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:40:33,179 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47 [2020-08-21 16:40:33,179 INFO L427 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:40:33,179 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:40:33,179 INFO L82 PathProgramCache]: Analyzing trace with hash -809482178, now seen corresponding path program 48 times [2020-08-21 16:40:33,179 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:40:33,179 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1519450073] [2020-08-21 16:40:33,179 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:40:33,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:34,871 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:40:34,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:34,877 INFO L134 CoverageAnalysis]: Checked inductivity of 1176 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:40:34,877 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1519450073] [2020-08-21 16:40:34,878 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:40:34,878 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51] total 51 [2020-08-21 16:40:34,878 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [73515186] [2020-08-21 16:40:34,878 INFO L459 AbstractCegarLoop]: Interpolant automaton has 51 states [2020-08-21 16:40:34,878 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:40:34,878 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2020-08-21 16:40:34,879 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=147, Invalid=2403, Unknown=0, NotChecked=0, Total=2550 [2020-08-21 16:40:34,879 INFO L87 Difference]: Start difference. First operand 59 states and 59 transitions. Second operand 51 states. [2020-08-21 16:40:36,357 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:40:36,357 INFO L93 Difference]: Finished difference Result 65 states and 65 transitions. [2020-08-21 16:40:36,358 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2020-08-21 16:40:36,358 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 58 [2020-08-21 16:40:36,358 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:40:36,359 INFO L225 Difference]: With dead ends: 65 [2020-08-21 16:40:36,359 INFO L226 Difference]: Without dead ends: 60 [2020-08-21 16:40:36,360 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=147, Invalid=2403, Unknown=0, NotChecked=0, Total=2550 [2020-08-21 16:40:36,360 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-08-21 16:40:36,364 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2020-08-21 16:40:36,364 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-08-21 16:40:36,365 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 60 transitions. [2020-08-21 16:40:36,365 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 60 transitions. Word has length 58 [2020-08-21 16:40:36,365 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:40:36,365 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 60 transitions. [2020-08-21 16:40:36,365 INFO L480 AbstractCegarLoop]: Interpolant automaton has 51 states. [2020-08-21 16:40:36,366 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 60 transitions. [2020-08-21 16:40:36,366 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2020-08-21 16:40:36,366 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:40:36,366 INFO L422 BasicCegarLoop]: trace histogram [49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:40:36,366 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable48 [2020-08-21 16:40:36,367 INFO L427 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:40:36,367 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:40:36,367 INFO L82 PathProgramCache]: Analyzing trace with hash 712317521, now seen corresponding path program 49 times [2020-08-21 16:40:36,367 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:40:36,367 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2080402416] [2020-08-21 16:40:36,367 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:40:36,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat