/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5000 --traceabstraction.additional.smt.options interpolation-heuristic=NARROWEST --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops/heavy-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 21:29:25,914 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 21:29:25,917 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 21:29:25,958 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 21:29:25,958 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 21:29:25,967 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 21:29:25,969 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 21:29:25,973 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 21:29:25,975 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 21:29:25,978 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 21:29:25,979 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 21:29:25,981 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 21:29:25,981 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 21:29:25,984 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 21:29:25,986 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 21:29:25,987 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 21:29:25,989 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 21:29:25,990 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 21:29:25,991 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 21:29:25,999 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 21:29:26,001 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 21:29:26,002 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 21:29:26,003 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 21:29:26,004 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 21:29:26,015 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-21 21:29:26,033 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 21:29:26,035 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 21:29:26,035 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 21:29:26,037 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 21:29:26,073 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 21:29:26,073 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 21:29:26,075 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 21:29:26,075 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 21:29:26,076 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 21:29:26,076 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 21:29:26,076 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 21:29:26,076 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 21:29:26,077 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 21:29:26,077 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 21:29:26,078 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 21:29:26,078 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 21:29:26,078 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 21:29:26,079 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 21:29:26,079 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 21:29:26,079 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 21:29:26,079 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 21:29:26,079 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 21:29:26,079 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 21:29:26,080 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 21:29:26,080 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 21:29:26,080 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 21:29:26,080 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 21:29:26,080 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 21:29:26,081 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 21:29:26,081 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 21:29:26,081 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 21:29:26,081 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 21:29:26,081 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 21:29:26,082 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=NARROWEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=NARROWEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=NARROWEST;log-additional-information=true; [2020-08-21 21:29:26,408 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 21:29:26,428 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 21:29:26,433 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 21:29:26,435 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 21:29:26,435 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 21:29:26,436 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/heavy-2.c [2020-08-21 21:29:26,512 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/271d77603/f533f0d03a9545878c4da290ff491434/FLAG144fb717d [2020-08-21 21:29:26,962 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 21:29:26,963 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loops/heavy-2.c [2020-08-21 21:29:26,969 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/271d77603/f533f0d03a9545878c4da290ff491434/FLAG144fb717d [2020-08-21 21:29:27,323 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/271d77603/f533f0d03a9545878c4da290ff491434 [2020-08-21 21:29:27,333 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 21:29:27,334 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 21:29:27,335 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 21:29:27,336 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 21:29:27,339 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 21:29:27,340 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 09:29:27" (1/1) ... [2020-08-21 21:29:27,343 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@590f663f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:29:27, skipping insertion in model container [2020-08-21 21:29:27,344 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 09:29:27" (1/1) ... [2020-08-21 21:29:27,351 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 21:29:27,368 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 21:29:27,547 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 21:29:27,584 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 21:29:27,603 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 21:29:27,660 INFO L208 MainTranslator]: Completed translation [2020-08-21 21:29:27,661 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:29:27 WrapperNode [2020-08-21 21:29:27,661 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 21:29:27,662 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 21:29:27,662 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 21:29:27,662 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 21:29:27,758 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:29:27" (1/1) ... [2020-08-21 21:29:27,760 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:29:27" (1/1) ... [2020-08-21 21:29:27,771 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:29:27" (1/1) ... [2020-08-21 21:29:27,771 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:29:27" (1/1) ... [2020-08-21 21:29:27,793 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:29:27" (1/1) ... [2020-08-21 21:29:27,802 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:29:27" (1/1) ... [2020-08-21 21:29:27,807 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:29:27" (1/1) ... [2020-08-21 21:29:27,809 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 21:29:27,810 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 21:29:27,810 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 21:29:27,810 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 21:29:27,814 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:29:27" (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 21:29:27,877 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 21:29:27,877 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 21:29:27,878 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 21:29:27,878 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 21:29:27,878 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 21:29:27,878 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-21 21:29:27,878 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-21 21:29:27,879 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 21:29:27,879 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-21 21:29:27,879 INFO L130 BoogieDeclarations]: Found specification of procedure write~unchecked~int [2020-08-21 21:29:27,879 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 21:29:27,879 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-21 21:29:28,130 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 21:29:28,130 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-08-21 21:29:28,134 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 09:29:28 BoogieIcfgContainer [2020-08-21 21:29:28,134 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 21:29:28,136 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 21:29:28,136 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 21:29:28,139 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 21:29:28,139 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 09:29:27" (1/3) ... [2020-08-21 21:29:28,140 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@65bf0279 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 09:29:28, skipping insertion in model container [2020-08-21 21:29:28,140 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:29:27" (2/3) ... [2020-08-21 21:29:28,141 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@65bf0279 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 09:29:28, skipping insertion in model container [2020-08-21 21:29:28,141 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 09:29:28" (3/3) ... [2020-08-21 21:29:28,142 INFO L109 eAbstractionObserver]: Analyzing ICFG heavy-2.c [2020-08-21 21:29:28,154 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 21:29:28,163 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 21:29:28,179 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 21:29:28,215 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 21:29:28,215 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 21:29:28,215 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 21:29:28,215 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 21:29:28,215 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 21:29:28,216 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 21:29:28,216 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 21:29:28,216 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 21:29:28,237 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states. [2020-08-21 21:29:28,244 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2020-08-21 21:29:28,245 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:28,246 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:28,246 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:28,252 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:28,253 INFO L82 PathProgramCache]: Analyzing trace with hash 242978043, now seen corresponding path program 1 times [2020-08-21 21:29:28,262 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:28,263 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [199653869] [2020-08-21 21:29:28,263 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:28,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:28,460 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:28,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:28,476 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 21:29:28,477 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [199653869] [2020-08-21 21:29:28,479 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 21:29:28,480 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-21 21:29:28,480 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1539282129] [2020-08-21 21:29:28,485 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-21 21:29:28,486 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:28,497 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-21 21:29:28,498 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 21:29:28,499 INFO L87 Difference]: Start difference. First operand 19 states. Second operand 3 states. [2020-08-21 21:29:28,596 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:28,597 INFO L93 Difference]: Finished difference Result 42 states and 61 transitions. [2020-08-21 21:29:28,597 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 21:29:28,599 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 9 [2020-08-21 21:29:28,599 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:28,609 INFO L225 Difference]: With dead ends: 42 [2020-08-21 21:29:28,609 INFO L226 Difference]: Without dead ends: 23 [2020-08-21 21:29:28,613 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 21:29:28,630 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-21 21:29:28,646 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 15. [2020-08-21 21:29:28,648 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-21 21:29:28,649 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2020-08-21 21:29:28,650 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 9 [2020-08-21 21:29:28,650 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:28,650 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2020-08-21 21:29:28,650 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-21 21:29:28,651 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2020-08-21 21:29:28,651 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2020-08-21 21:29:28,651 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:28,651 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:28,652 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 21:29:28,652 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:28,652 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:28,652 INFO L82 PathProgramCache]: Analyzing trace with hash 242949213, now seen corresponding path program 1 times [2020-08-21 21:29:28,653 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:28,653 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [31548288] [2020-08-21 21:29:28,653 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:28,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:28,745 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:28,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:28,758 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 21:29:28,758 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [31548288] [2020-08-21 21:29:28,758 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 21:29:28,759 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-21 21:29:28,759 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1180260603] [2020-08-21 21:29:28,761 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 21:29:28,761 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:28,761 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 21:29:28,762 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 21:29:28,762 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 4 states. [2020-08-21 21:29:28,869 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:28,870 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2020-08-21 21:29:28,870 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 21:29:28,870 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 9 [2020-08-21 21:29:28,871 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:28,872 INFO L225 Difference]: With dead ends: 36 [2020-08-21 21:29:28,872 INFO L226 Difference]: Without dead ends: 33 [2020-08-21 21:29:28,873 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-21 21:29:28,874 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-21 21:29:28,880 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 16. [2020-08-21 21:29:28,880 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-21 21:29:28,881 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2020-08-21 21:29:28,881 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 9 [2020-08-21 21:29:28,881 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:28,882 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2020-08-21 21:29:28,882 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 21:29:28,882 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2020-08-21 21:29:28,882 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-21 21:29:28,883 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:28,883 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:28,883 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 21:29:28,883 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:28,884 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:28,884 INFO L82 PathProgramCache]: Analyzing trace with hash 713101374, now seen corresponding path program 1 times [2020-08-21 21:29:28,884 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:28,885 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [826002208] [2020-08-21 21:29:28,885 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:28,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:28,998 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:29,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:29,008 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:29:29,009 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [826002208] [2020-08-21 21:29:29,009 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 21:29:29,009 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-21 21:29:29,010 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [989664836] [2020-08-21 21:29:29,010 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 21:29:29,010 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:29,011 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 21:29:29,011 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 21:29:29,011 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand 4 states. [2020-08-21 21:29:29,121 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:29,121 INFO L93 Difference]: Finished difference Result 40 states and 50 transitions. [2020-08-21 21:29:29,122 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 21:29:29,122 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 12 [2020-08-21 21:29:29,122 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:29,123 INFO L225 Difference]: With dead ends: 40 [2020-08-21 21:29:29,123 INFO L226 Difference]: Without dead ends: 31 [2020-08-21 21:29:29,124 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-21 21:29:29,125 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-21 21:29:29,129 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 17. [2020-08-21 21:29:29,130 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-21 21:29:29,131 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2020-08-21 21:29:29,131 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 12 [2020-08-21 21:29:29,131 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:29,131 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2020-08-21 21:29:29,132 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 21:29:29,132 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2020-08-21 21:29:29,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-21 21:29:29,133 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:29,133 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:29,133 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 21:29:29,134 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:29,134 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:29,134 INFO L82 PathProgramCache]: Analyzing trace with hash -1111837415, now seen corresponding path program 1 times [2020-08-21 21:29:29,134 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:29,135 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2131066155] [2020-08-21 21:29:29,135 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:29,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:29,222 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:29,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:29,244 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:29:29,245 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2131066155] [2020-08-21 21:29:29,245 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 21:29:29,245 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-21 21:29:29,245 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [171297496] [2020-08-21 21:29:29,246 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 21:29:29,246 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:29,246 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 21:29:29,247 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 21:29:29,247 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand 4 states. [2020-08-21 21:29:29,313 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:29,313 INFO L93 Difference]: Finished difference Result 31 states and 37 transitions. [2020-08-21 21:29:29,313 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 21:29:29,314 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 15 [2020-08-21 21:29:29,314 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:29,314 INFO L225 Difference]: With dead ends: 31 [2020-08-21 21:29:29,315 INFO L226 Difference]: Without dead ends: 21 [2020-08-21 21:29:29,315 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-21 21:29:29,316 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-21 21:29:29,319 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 18. [2020-08-21 21:29:29,319 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-21 21:29:29,320 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2020-08-21 21:29:29,321 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 15 [2020-08-21 21:29:29,321 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:29,321 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2020-08-21 21:29:29,321 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 21:29:29,321 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2020-08-21 21:29:29,322 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-21 21:29:29,322 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:29,322 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:29,322 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 21:29:29,323 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:29,323 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:29,323 INFO L82 PathProgramCache]: Analyzing trace with hash 1672606071, now seen corresponding path program 1 times [2020-08-21 21:29:29,323 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:29,324 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [448060544] [2020-08-21 21:29:29,324 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:29,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:29,423 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:29,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:29,431 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:29:29,431 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [448060544] [2020-08-21 21:29:29,431 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:29,432 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-21 21:29:29,432 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [878922592] [2020-08-21 21:29:29,432 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 21:29:29,432 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:29,433 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 21:29:29,433 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-21 21:29:29,433 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 5 states. [2020-08-21 21:29:29,502 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:29,503 INFO L93 Difference]: Finished difference Result 34 states and 39 transitions. [2020-08-21 21:29:29,503 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 21:29:29,503 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2020-08-21 21:29:29,503 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:29,504 INFO L225 Difference]: With dead ends: 34 [2020-08-21 21:29:29,504 INFO L226 Difference]: Without dead ends: 23 [2020-08-21 21:29:29,505 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2020-08-21 21:29:29,505 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-21 21:29:29,509 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 20. [2020-08-21 21:29:29,509 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-21 21:29:29,510 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2020-08-21 21:29:29,510 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 17 [2020-08-21 21:29:29,510 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:29,511 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2020-08-21 21:29:29,511 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 21:29:29,511 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2020-08-21 21:29:29,511 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-21 21:29:29,512 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:29,512 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:29,512 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 21:29:29,512 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:29,512 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:29,513 INFO L82 PathProgramCache]: Analyzing trace with hash 1758170709, now seen corresponding path program 2 times [2020-08-21 21:29:29,513 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:29,513 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [342973927] [2020-08-21 21:29:29,513 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:29,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:29,619 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:29,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:29,626 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:29:29,627 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [342973927] [2020-08-21 21:29:29,627 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:29,627 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-21 21:29:29,628 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1328472620] [2020-08-21 21:29:29,628 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 21:29:29,628 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:29,628 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 21:29:29,629 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-21 21:29:29,629 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand 6 states. [2020-08-21 21:29:29,719 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:29,719 INFO L93 Difference]: Finished difference Result 38 states and 43 transitions. [2020-08-21 21:29:29,720 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 21:29:29,720 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 19 [2020-08-21 21:29:29,720 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:29,721 INFO L225 Difference]: With dead ends: 38 [2020-08-21 21:29:29,721 INFO L226 Difference]: Without dead ends: 25 [2020-08-21 21:29:29,721 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2020-08-21 21:29:29,722 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-21 21:29:29,726 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 22. [2020-08-21 21:29:29,726 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-08-21 21:29:29,727 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2020-08-21 21:29:29,727 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 19 [2020-08-21 21:29:29,727 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:29,728 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2020-08-21 21:29:29,728 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 21:29:29,728 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2020-08-21 21:29:29,728 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-08-21 21:29:29,729 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:29,729 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:29,729 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 21:29:29,729 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:29,729 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:29,730 INFO L82 PathProgramCache]: Analyzing trace with hash -1913558093, now seen corresponding path program 3 times [2020-08-21 21:29:29,730 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:29,730 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1902687861] [2020-08-21 21:29:29,730 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:29,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:29,894 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:29,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:29,902 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:29:29,903 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1902687861] [2020-08-21 21:29:29,903 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:29,903 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 21:29:29,903 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2012842620] [2020-08-21 21:29:29,906 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 21:29:29,907 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:29,907 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 21:29:29,908 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-08-21 21:29:29,908 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand 7 states. [2020-08-21 21:29:30,024 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:30,025 INFO L93 Difference]: Finished difference Result 42 states and 47 transitions. [2020-08-21 21:29:30,025 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-21 21:29:30,026 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 21 [2020-08-21 21:29:30,026 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:30,026 INFO L225 Difference]: With dead ends: 42 [2020-08-21 21:29:30,026 INFO L226 Difference]: Without dead ends: 27 [2020-08-21 21:29:30,027 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2020-08-21 21:29:30,027 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-08-21 21:29:30,034 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 24. [2020-08-21 21:29:30,034 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-21 21:29:30,036 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2020-08-21 21:29:30,036 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 21 [2020-08-21 21:29:30,036 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:30,037 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2020-08-21 21:29:30,037 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 21:29:30,037 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2020-08-21 21:29:30,038 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-08-21 21:29:30,038 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:30,038 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:30,039 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 21:29:30,039 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:30,039 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:30,039 INFO L82 PathProgramCache]: Analyzing trace with hash 18180497, now seen corresponding path program 4 times [2020-08-21 21:29:30,040 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:30,040 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [976132724] [2020-08-21 21:29:30,040 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:30,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:30,196 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:30,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:30,202 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 2 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:29:30,203 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [976132724] [2020-08-21 21:29:30,203 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:30,203 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 21:29:30,204 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [380894170] [2020-08-21 21:29:30,204 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 21:29:30,204 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:30,205 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 21:29:30,205 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-08-21 21:29:30,205 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand 8 states. [2020-08-21 21:29:30,343 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:30,343 INFO L93 Difference]: Finished difference Result 46 states and 51 transitions. [2020-08-21 21:29:30,343 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 21:29:30,344 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 23 [2020-08-21 21:29:30,344 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:30,344 INFO L225 Difference]: With dead ends: 46 [2020-08-21 21:29:30,345 INFO L226 Difference]: Without dead ends: 29 [2020-08-21 21:29:30,345 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-08-21 21:29:30,346 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-21 21:29:30,350 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 26. [2020-08-21 21:29:30,350 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-21 21:29:30,351 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2020-08-21 21:29:30,351 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 23 [2020-08-21 21:29:30,351 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:30,351 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2020-08-21 21:29:30,351 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 21:29:30,351 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2020-08-21 21:29:30,352 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-21 21:29:30,352 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:30,352 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:30,353 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-21 21:29:30,353 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:30,353 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:30,353 INFO L82 PathProgramCache]: Analyzing trace with hash 993093615, now seen corresponding path program 5 times [2020-08-21 21:29:30,353 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:30,354 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [933260487] [2020-08-21 21:29:30,354 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:30,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:30,483 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:30,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:30,489 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:29:30,489 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [933260487] [2020-08-21 21:29:30,489 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:30,490 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 21:29:30,490 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [467908899] [2020-08-21 21:29:30,490 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 21:29:30,491 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:30,491 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 21:29:30,491 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2020-08-21 21:29:30,491 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 9 states. [2020-08-21 21:29:30,641 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:30,641 INFO L93 Difference]: Finished difference Result 50 states and 55 transitions. [2020-08-21 21:29:30,642 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 21:29:30,642 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 25 [2020-08-21 21:29:30,642 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:30,643 INFO L225 Difference]: With dead ends: 50 [2020-08-21 21:29:30,643 INFO L226 Difference]: Without dead ends: 31 [2020-08-21 21:29:30,643 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2020-08-21 21:29:30,644 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-21 21:29:30,648 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 28. [2020-08-21 21:29:30,648 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-21 21:29:30,649 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2020-08-21 21:29:30,650 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 25 [2020-08-21 21:29:30,650 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:30,650 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2020-08-21 21:29:30,650 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 21:29:30,650 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2020-08-21 21:29:30,651 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-21 21:29:30,651 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:30,651 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:30,651 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-21 21:29:30,652 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:30,652 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:30,652 INFO L82 PathProgramCache]: Analyzing trace with hash 1581729485, now seen corresponding path program 6 times [2020-08-21 21:29:30,652 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:30,653 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [768990749] [2020-08-21 21:29:30,653 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:30,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:30,798 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:30,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:30,804 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 2 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:29:30,804 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [768990749] [2020-08-21 21:29:30,805 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:30,805 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-21 21:29:30,805 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [637327732] [2020-08-21 21:29:30,805 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 21:29:30,806 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:30,806 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 21:29:30,806 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2020-08-21 21:29:30,806 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand 10 states. [2020-08-21 21:29:30,989 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:30,990 INFO L93 Difference]: Finished difference Result 54 states and 59 transitions. [2020-08-21 21:29:30,990 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-21 21:29:30,990 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-08-21 21:29:30,991 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:30,991 INFO L225 Difference]: With dead ends: 54 [2020-08-21 21:29:30,991 INFO L226 Difference]: Without dead ends: 33 [2020-08-21 21:29:30,992 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2020-08-21 21:29:30,992 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-21 21:29:30,996 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 30. [2020-08-21 21:29:30,997 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-08-21 21:29:30,997 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2020-08-21 21:29:30,998 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 27 [2020-08-21 21:29:30,998 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:30,998 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2020-08-21 21:29:30,998 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 21:29:30,998 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2020-08-21 21:29:30,999 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-08-21 21:29:30,999 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:30,999 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:30,999 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-21 21:29:30,999 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:31,000 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:31,000 INFO L82 PathProgramCache]: Analyzing trace with hash 325117483, now seen corresponding path program 7 times [2020-08-21 21:29:31,000 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:31,000 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [132455614] [2020-08-21 21:29:31,000 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:31,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:31,172 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:31,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:31,188 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 2 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:29:31,189 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [132455614] [2020-08-21 21:29:31,189 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:31,189 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-21 21:29:31,189 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [675561925] [2020-08-21 21:29:31,190 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 21:29:31,190 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:31,190 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 21:29:31,190 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2020-08-21 21:29:31,191 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand 11 states. [2020-08-21 21:29:31,394 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:31,394 INFO L93 Difference]: Finished difference Result 58 states and 63 transitions. [2020-08-21 21:29:31,395 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-21 21:29:31,395 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 29 [2020-08-21 21:29:31,395 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:31,396 INFO L225 Difference]: With dead ends: 58 [2020-08-21 21:29:31,396 INFO L226 Difference]: Without dead ends: 35 [2020-08-21 21:29:31,397 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=101, Unknown=0, NotChecked=0, Total=132 [2020-08-21 21:29:31,397 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-21 21:29:31,401 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 32. [2020-08-21 21:29:31,402 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-08-21 21:29:31,402 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2020-08-21 21:29:31,402 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 29 [2020-08-21 21:29:31,403 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:31,403 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2020-08-21 21:29:31,403 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 21:29:31,403 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2020-08-21 21:29:31,404 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-21 21:29:31,404 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:31,404 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:31,404 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-21 21:29:31,404 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:31,405 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:31,405 INFO L82 PathProgramCache]: Analyzing trace with hash -393206263, now seen corresponding path program 8 times [2020-08-21 21:29:31,405 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:31,405 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2033060549] [2020-08-21 21:29:31,406 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:31,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:31,601 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:31,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:31,607 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 2 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:29:31,608 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2033060549] [2020-08-21 21:29:31,608 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:31,608 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-21 21:29:31,609 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [709627199] [2020-08-21 21:29:31,609 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-21 21:29:31,609 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:31,609 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-21 21:29:31,610 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2020-08-21 21:29:31,610 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand 12 states. [2020-08-21 21:29:31,867 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:31,868 INFO L93 Difference]: Finished difference Result 62 states and 67 transitions. [2020-08-21 21:29:31,868 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-21 21:29:31,868 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 31 [2020-08-21 21:29:31,869 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:31,869 INFO L225 Difference]: With dead ends: 62 [2020-08-21 21:29:31,869 INFO L226 Difference]: Without dead ends: 37 [2020-08-21 21:29:31,871 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=34, Invalid=122, Unknown=0, NotChecked=0, Total=156 [2020-08-21 21:29:31,871 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-21 21:29:31,879 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 34. [2020-08-21 21:29:31,879 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-21 21:29:31,880 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 36 transitions. [2020-08-21 21:29:31,880 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 36 transitions. Word has length 31 [2020-08-21 21:29:31,880 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:31,881 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 36 transitions. [2020-08-21 21:29:31,881 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-21 21:29:31,882 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 36 transitions. [2020-08-21 21:29:31,886 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-21 21:29:31,886 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:31,886 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:31,887 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-21 21:29:31,887 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:31,887 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:31,887 INFO L82 PathProgramCache]: Analyzing trace with hash 787408487, now seen corresponding path program 9 times [2020-08-21 21:29:31,887 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:31,889 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [34536255] [2020-08-21 21:29:31,890 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:31,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:32,140 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:32,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:32,151 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 2 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:29:32,151 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [34536255] [2020-08-21 21:29:32,151 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:32,152 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 21:29:32,153 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1171374008] [2020-08-21 21:29:32,153 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 21:29:32,153 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:32,154 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 21:29:32,154 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2020-08-21 21:29:32,154 INFO L87 Difference]: Start difference. First operand 34 states and 36 transitions. Second operand 13 states. [2020-08-21 21:29:32,448 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:32,448 INFO L93 Difference]: Finished difference Result 66 states and 71 transitions. [2020-08-21 21:29:32,448 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-21 21:29:32,449 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 33 [2020-08-21 21:29:32,449 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:32,452 INFO L225 Difference]: With dead ends: 66 [2020-08-21 21:29:32,452 INFO L226 Difference]: Without dead ends: 39 [2020-08-21 21:29:32,453 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2020-08-21 21:29:32,454 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-21 21:29:32,461 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 36. [2020-08-21 21:29:32,462 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-21 21:29:32,464 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2020-08-21 21:29:32,464 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 33 [2020-08-21 21:29:32,465 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:32,465 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2020-08-21 21:29:32,465 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 21:29:32,465 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2020-08-21 21:29:32,468 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-08-21 21:29:32,468 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:32,469 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:32,469 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-21 21:29:32,470 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:32,470 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:32,470 INFO L82 PathProgramCache]: Analyzing trace with hash 1486817093, now seen corresponding path program 10 times [2020-08-21 21:29:32,471 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:32,471 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [116330684] [2020-08-21 21:29:32,471 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:32,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:32,841 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:32,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:32,851 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 2 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:29:32,852 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [116330684] [2020-08-21 21:29:32,852 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:32,852 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-21 21:29:32,852 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1291367408] [2020-08-21 21:29:32,853 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-21 21:29:32,853 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:32,854 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-21 21:29:32,855 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2020-08-21 21:29:32,855 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand 14 states. [2020-08-21 21:29:33,192 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:33,192 INFO L93 Difference]: Finished difference Result 70 states and 75 transitions. [2020-08-21 21:29:33,193 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-21 21:29:33,193 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 35 [2020-08-21 21:29:33,193 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:33,194 INFO L225 Difference]: With dead ends: 70 [2020-08-21 21:29:33,194 INFO L226 Difference]: Without dead ends: 41 [2020-08-21 21:29:33,195 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2020-08-21 21:29:33,195 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-21 21:29:33,202 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 38. [2020-08-21 21:29:33,204 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-21 21:29:33,205 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2020-08-21 21:29:33,205 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 35 [2020-08-21 21:29:33,205 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:33,205 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2020-08-21 21:29:33,205 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-21 21:29:33,205 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2020-08-21 21:29:33,206 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-21 21:29:33,206 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:33,206 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:33,206 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-21 21:29:33,206 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:33,208 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:33,208 INFO L82 PathProgramCache]: Analyzing trace with hash -691378013, now seen corresponding path program 11 times [2020-08-21 21:29:33,208 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:33,209 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2112642611] [2020-08-21 21:29:33,209 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:33,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:33,516 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:33,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:33,524 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 2 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:29:33,524 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2112642611] [2020-08-21 21:29:33,524 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:33,525 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-21 21:29:33,525 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1476658737] [2020-08-21 21:29:33,525 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-21 21:29:33,526 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:33,526 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-21 21:29:33,526 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=172, Unknown=0, NotChecked=0, Total=210 [2020-08-21 21:29:33,527 INFO L87 Difference]: Start difference. First operand 38 states and 40 transitions. Second operand 15 states. [2020-08-21 21:29:33,905 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:33,905 INFO L93 Difference]: Finished difference Result 74 states and 79 transitions. [2020-08-21 21:29:33,905 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-21 21:29:33,905 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 37 [2020-08-21 21:29:33,906 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:33,906 INFO L225 Difference]: With dead ends: 74 [2020-08-21 21:29:33,906 INFO L226 Difference]: Without dead ends: 43 [2020-08-21 21:29:33,907 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=43, Invalid=197, Unknown=0, NotChecked=0, Total=240 [2020-08-21 21:29:33,908 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-21 21:29:33,918 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 40. [2020-08-21 21:29:33,918 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-21 21:29:33,920 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 42 transitions. [2020-08-21 21:29:33,921 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 42 transitions. Word has length 37 [2020-08-21 21:29:33,921 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:33,921 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 42 transitions. [2020-08-21 21:29:33,921 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-21 21:29:33,922 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 42 transitions. [2020-08-21 21:29:33,924 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-21 21:29:33,924 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:33,924 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:33,924 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-21 21:29:33,925 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:33,925 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:33,925 INFO L82 PathProgramCache]: Analyzing trace with hash 2007165569, now seen corresponding path program 12 times [2020-08-21 21:29:33,925 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:33,925 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [83924629] [2020-08-21 21:29:33,926 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:33,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:34,204 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:34,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:34,214 INFO L134 CoverageAnalysis]: Checked inductivity of 146 backedges. 2 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:29:34,215 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [83924629] [2020-08-21 21:29:34,217 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:34,217 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-21 21:29:34,218 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [811491788] [2020-08-21 21:29:34,218 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-21 21:29:34,219 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:34,219 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-21 21:29:34,219 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2020-08-21 21:29:34,219 INFO L87 Difference]: Start difference. First operand 40 states and 42 transitions. Second operand 16 states. [2020-08-21 21:29:34,639 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:34,640 INFO L93 Difference]: Finished difference Result 78 states and 83 transitions. [2020-08-21 21:29:34,640 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-21 21:29:34,641 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 39 [2020-08-21 21:29:34,641 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:34,641 INFO L225 Difference]: With dead ends: 78 [2020-08-21 21:29:34,641 INFO L226 Difference]: Without dead ends: 45 [2020-08-21 21:29:34,642 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=46, Invalid=226, Unknown=0, NotChecked=0, Total=272 [2020-08-21 21:29:34,643 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-08-21 21:29:34,648 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 42. [2020-08-21 21:29:34,649 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-21 21:29:34,649 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 44 transitions. [2020-08-21 21:29:34,649 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 44 transitions. Word has length 39 [2020-08-21 21:29:34,650 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:34,650 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 44 transitions. [2020-08-21 21:29:34,650 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-21 21:29:34,650 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 44 transitions. [2020-08-21 21:29:34,651 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-21 21:29:34,651 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:34,651 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:34,651 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-21 21:29:34,651 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:34,652 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:34,652 INFO L82 PathProgramCache]: Analyzing trace with hash 1147301087, now seen corresponding path program 13 times [2020-08-21 21:29:34,652 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:34,652 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2123124860] [2020-08-21 21:29:34,652 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:34,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:34,983 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:34,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:34,993 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 2 proven. 169 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:29:34,993 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2123124860] [2020-08-21 21:29:34,994 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:34,994 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-21 21:29:34,994 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1059564598] [2020-08-21 21:29:34,995 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-21 21:29:34,995 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:34,995 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-21 21:29:34,996 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2020-08-21 21:29:34,996 INFO L87 Difference]: Start difference. First operand 42 states and 44 transitions. Second operand 17 states. [2020-08-21 21:29:35,464 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:35,465 INFO L93 Difference]: Finished difference Result 82 states and 87 transitions. [2020-08-21 21:29:35,465 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-21 21:29:35,465 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 41 [2020-08-21 21:29:35,465 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:35,466 INFO L225 Difference]: With dead ends: 82 [2020-08-21 21:29:35,466 INFO L226 Difference]: Without dead ends: 47 [2020-08-21 21:29:35,467 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2020-08-21 21:29:35,468 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-21 21:29:35,472 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 44. [2020-08-21 21:29:35,472 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-21 21:29:35,473 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 46 transitions. [2020-08-21 21:29:35,473 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 46 transitions. Word has length 41 [2020-08-21 21:29:35,473 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:35,473 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 46 transitions. [2020-08-21 21:29:35,473 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-21 21:29:35,473 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 46 transitions. [2020-08-21 21:29:35,474 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-21 21:29:35,474 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:35,474 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:35,474 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-21 21:29:35,475 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:35,475 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:35,475 INFO L82 PathProgramCache]: Analyzing trace with hash -548745283, now seen corresponding path program 14 times [2020-08-21 21:29:35,475 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:35,475 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [807767512] [2020-08-21 21:29:35,476 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:35,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:35,762 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:35,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:35,771 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 2 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:29:35,772 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [807767512] [2020-08-21 21:29:35,772 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:35,773 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-21 21:29:35,773 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1895188388] [2020-08-21 21:29:35,773 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-21 21:29:35,774 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:35,774 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-21 21:29:35,774 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=259, Unknown=0, NotChecked=0, Total=306 [2020-08-21 21:29:35,774 INFO L87 Difference]: Start difference. First operand 44 states and 46 transitions. Second operand 18 states. [2020-08-21 21:29:36,274 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:36,275 INFO L93 Difference]: Finished difference Result 86 states and 91 transitions. [2020-08-21 21:29:36,275 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-21 21:29:36,275 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 43 [2020-08-21 21:29:36,276 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:36,276 INFO L225 Difference]: With dead ends: 86 [2020-08-21 21:29:36,276 INFO L226 Difference]: Without dead ends: 49 [2020-08-21 21:29:36,277 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=52, Invalid=290, Unknown=0, NotChecked=0, Total=342 [2020-08-21 21:29:36,277 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-21 21:29:36,282 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 46. [2020-08-21 21:29:36,282 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-21 21:29:36,282 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 48 transitions. [2020-08-21 21:29:36,283 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 48 transitions. Word has length 43 [2020-08-21 21:29:36,283 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:36,283 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 48 transitions. [2020-08-21 21:29:36,283 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-21 21:29:36,283 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 48 transitions. [2020-08-21 21:29:36,284 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-08-21 21:29:36,284 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:36,284 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:36,284 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-21 21:29:36,284 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:36,285 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:36,285 INFO L82 PathProgramCache]: Analyzing trace with hash 1638265627, now seen corresponding path program 15 times [2020-08-21 21:29:36,285 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:36,285 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1401604487] [2020-08-21 21:29:36,285 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:36,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:36,655 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:36,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:36,662 INFO L134 CoverageAnalysis]: Checked inductivity of 227 backedges. 2 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:29:36,663 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1401604487] [2020-08-21 21:29:36,663 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:36,663 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-21 21:29:36,663 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [425101943] [2020-08-21 21:29:36,664 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-21 21:29:36,664 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:36,664 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-21 21:29:36,664 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=292, Unknown=0, NotChecked=0, Total=342 [2020-08-21 21:29:36,665 INFO L87 Difference]: Start difference. First operand 46 states and 48 transitions. Second operand 19 states. [2020-08-21 21:29:37,201 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:37,201 INFO L93 Difference]: Finished difference Result 90 states and 95 transitions. [2020-08-21 21:29:37,201 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-21 21:29:37,201 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 45 [2020-08-21 21:29:37,202 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:37,202 INFO L225 Difference]: With dead ends: 90 [2020-08-21 21:29:37,202 INFO L226 Difference]: Without dead ends: 51 [2020-08-21 21:29:37,203 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=55, Invalid=325, Unknown=0, NotChecked=0, Total=380 [2020-08-21 21:29:37,203 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-08-21 21:29:37,209 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 48. [2020-08-21 21:29:37,209 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-21 21:29:37,209 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 50 transitions. [2020-08-21 21:29:37,211 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 50 transitions. Word has length 45 [2020-08-21 21:29:37,211 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:37,211 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 50 transitions. [2020-08-21 21:29:37,211 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-21 21:29:37,211 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 50 transitions. [2020-08-21 21:29:37,212 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-08-21 21:29:37,212 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:37,212 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:37,212 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-21 21:29:37,212 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:37,213 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:37,213 INFO L82 PathProgramCache]: Analyzing trace with hash -1178224903, now seen corresponding path program 16 times [2020-08-21 21:29:37,213 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:37,213 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [786563781] [2020-08-21 21:29:37,213 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:37,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:37,583 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:37,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:37,592 INFO L134 CoverageAnalysis]: Checked inductivity of 258 backedges. 2 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:29:37,593 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [786563781] [2020-08-21 21:29:37,593 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:37,593 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-21 21:29:37,593 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1221118623] [2020-08-21 21:29:37,594 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-21 21:29:37,594 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:37,595 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-21 21:29:37,595 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=327, Unknown=0, NotChecked=0, Total=380 [2020-08-21 21:29:37,595 INFO L87 Difference]: Start difference. First operand 48 states and 50 transitions. Second operand 20 states. [2020-08-21 21:29:38,167 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:38,167 INFO L93 Difference]: Finished difference Result 94 states and 99 transitions. [2020-08-21 21:29:38,167 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-21 21:29:38,168 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 47 [2020-08-21 21:29:38,168 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:38,168 INFO L225 Difference]: With dead ends: 94 [2020-08-21 21:29:38,169 INFO L226 Difference]: Without dead ends: 53 [2020-08-21 21:29:38,169 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=58, Invalid=362, Unknown=0, NotChecked=0, Total=420 [2020-08-21 21:29:38,170 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-08-21 21:29:38,173 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 50. [2020-08-21 21:29:38,174 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-08-21 21:29:38,174 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 52 transitions. [2020-08-21 21:29:38,174 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 52 transitions. Word has length 47 [2020-08-21 21:29:38,174 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:38,175 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 52 transitions. [2020-08-21 21:29:38,175 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-21 21:29:38,175 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 52 transitions. [2020-08-21 21:29:38,175 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-08-21 21:29:38,175 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:38,176 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:38,176 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-21 21:29:38,176 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:38,176 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:38,176 INFO L82 PathProgramCache]: Analyzing trace with hash -1996227753, now seen corresponding path program 17 times [2020-08-21 21:29:38,177 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:38,177 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1284824351] [2020-08-21 21:29:38,177 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:38,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:38,585 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:38,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:38,592 INFO L134 CoverageAnalysis]: Checked inductivity of 291 backedges. 2 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:29:38,593 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1284824351] [2020-08-21 21:29:38,593 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:38,593 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-21 21:29:38,593 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1255604786] [2020-08-21 21:29:38,594 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-21 21:29:38,594 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:38,594 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-21 21:29:38,594 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=364, Unknown=0, NotChecked=0, Total=420 [2020-08-21 21:29:38,594 INFO L87 Difference]: Start difference. First operand 50 states and 52 transitions. Second operand 21 states. [2020-08-21 21:29:39,183 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:39,183 INFO L93 Difference]: Finished difference Result 98 states and 103 transitions. [2020-08-21 21:29:39,183 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-21 21:29:39,184 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 49 [2020-08-21 21:29:39,184 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:39,184 INFO L225 Difference]: With dead ends: 98 [2020-08-21 21:29:39,184 INFO L226 Difference]: Without dead ends: 55 [2020-08-21 21:29:39,185 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=61, Invalid=401, Unknown=0, NotChecked=0, Total=462 [2020-08-21 21:29:39,186 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-08-21 21:29:39,195 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 52. [2020-08-21 21:29:39,196 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-08-21 21:29:39,196 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 54 transitions. [2020-08-21 21:29:39,196 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 54 transitions. Word has length 49 [2020-08-21 21:29:39,196 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:39,197 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 54 transitions. [2020-08-21 21:29:39,197 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-21 21:29:39,197 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 54 transitions. [2020-08-21 21:29:39,197 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-08-21 21:29:39,197 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:39,197 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:39,199 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-21 21:29:39,200 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:39,200 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:39,200 INFO L82 PathProgramCache]: Analyzing trace with hash -2117951435, now seen corresponding path program 18 times [2020-08-21 21:29:39,200 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:39,201 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [684328093] [2020-08-21 21:29:39,201 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:39,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:39,624 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:39,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:39,632 INFO L134 CoverageAnalysis]: Checked inductivity of 326 backedges. 2 proven. 324 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:29:39,632 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [684328093] [2020-08-21 21:29:39,633 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:39,633 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-21 21:29:39,633 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [840193040] [2020-08-21 21:29:39,634 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-21 21:29:39,634 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:39,634 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-21 21:29:39,634 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=403, Unknown=0, NotChecked=0, Total=462 [2020-08-21 21:29:39,635 INFO L87 Difference]: Start difference. First operand 52 states and 54 transitions. Second operand 22 states. [2020-08-21 21:29:40,298 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:40,298 INFO L93 Difference]: Finished difference Result 102 states and 107 transitions. [2020-08-21 21:29:40,301 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-21 21:29:40,301 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 51 [2020-08-21 21:29:40,302 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:40,302 INFO L225 Difference]: With dead ends: 102 [2020-08-21 21:29:40,303 INFO L226 Difference]: Without dead ends: 57 [2020-08-21 21:29:40,303 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=64, Invalid=442, Unknown=0, NotChecked=0, Total=506 [2020-08-21 21:29:40,304 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-08-21 21:29:40,309 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 54. [2020-08-21 21:29:40,309 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-08-21 21:29:40,310 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 56 transitions. [2020-08-21 21:29:40,310 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 56 transitions. Word has length 51 [2020-08-21 21:29:40,310 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:40,310 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 56 transitions. [2020-08-21 21:29:40,310 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-21 21:29:40,310 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 56 transitions. [2020-08-21 21:29:40,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-08-21 21:29:40,311 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:40,311 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:40,311 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-21 21:29:40,311 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:40,312 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:40,312 INFO L82 PathProgramCache]: Analyzing trace with hash 1164674451, now seen corresponding path program 19 times [2020-08-21 21:29:40,312 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:40,312 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [156208810] [2020-08-21 21:29:40,312 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:40,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:40,770 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:40,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:40,779 INFO L134 CoverageAnalysis]: Checked inductivity of 363 backedges. 2 proven. 361 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:29:40,780 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [156208810] [2020-08-21 21:29:40,780 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:40,780 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-21 21:29:40,780 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1555057776] [2020-08-21 21:29:40,781 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-21 21:29:40,781 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:40,781 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-21 21:29:40,781 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=444, Unknown=0, NotChecked=0, Total=506 [2020-08-21 21:29:40,782 INFO L87 Difference]: Start difference. First operand 54 states and 56 transitions. Second operand 23 states. [2020-08-21 21:29:41,498 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:41,498 INFO L93 Difference]: Finished difference Result 106 states and 111 transitions. [2020-08-21 21:29:41,508 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-21 21:29:41,508 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 53 [2020-08-21 21:29:41,508 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:41,509 INFO L225 Difference]: With dead ends: 106 [2020-08-21 21:29:41,509 INFO L226 Difference]: Without dead ends: 59 [2020-08-21 21:29:41,510 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=67, Invalid=485, Unknown=0, NotChecked=0, Total=552 [2020-08-21 21:29:41,510 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-08-21 21:29:41,513 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 56. [2020-08-21 21:29:41,514 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-08-21 21:29:41,514 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 58 transitions. [2020-08-21 21:29:41,514 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 58 transitions. Word has length 53 [2020-08-21 21:29:41,515 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:41,515 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 58 transitions. [2020-08-21 21:29:41,515 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-21 21:29:41,515 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 58 transitions. [2020-08-21 21:29:41,515 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-08-21 21:29:41,515 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:41,516 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:41,516 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-21 21:29:41,516 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:41,516 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:41,516 INFO L82 PathProgramCache]: Analyzing trace with hash -1032811663, now seen corresponding path program 20 times [2020-08-21 21:29:41,516 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:41,517 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2138161869] [2020-08-21 21:29:41,517 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:41,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:42,036 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:42,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:42,045 INFO L134 CoverageAnalysis]: Checked inductivity of 402 backedges. 2 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:29:42,046 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2138161869] [2020-08-21 21:29:42,046 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:42,046 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-21 21:29:42,046 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [723538577] [2020-08-21 21:29:42,047 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-21 21:29:42,047 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:42,047 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-21 21:29:42,047 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=487, Unknown=0, NotChecked=0, Total=552 [2020-08-21 21:29:42,048 INFO L87 Difference]: Start difference. First operand 56 states and 58 transitions. Second operand 24 states. [2020-08-21 21:29:42,902 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:42,902 INFO L93 Difference]: Finished difference Result 110 states and 115 transitions. [2020-08-21 21:29:42,906 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-21 21:29:42,906 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 55 [2020-08-21 21:29:42,907 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:42,907 INFO L225 Difference]: With dead ends: 110 [2020-08-21 21:29:42,907 INFO L226 Difference]: Without dead ends: 61 [2020-08-21 21:29:42,908 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=70, Invalid=530, Unknown=0, NotChecked=0, Total=600 [2020-08-21 21:29:42,908 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-08-21 21:29:42,911 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 58. [2020-08-21 21:29:42,911 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-08-21 21:29:42,912 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 60 transitions. [2020-08-21 21:29:42,912 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 60 transitions. Word has length 55 [2020-08-21 21:29:42,912 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:42,912 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 60 transitions. [2020-08-21 21:29:42,912 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-21 21:29:42,913 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 60 transitions. [2020-08-21 21:29:42,913 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-08-21 21:29:42,914 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:42,914 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:42,914 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-21 21:29:42,914 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:42,914 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:42,914 INFO L82 PathProgramCache]: Analyzing trace with hash 306942415, now seen corresponding path program 21 times [2020-08-21 21:29:42,915 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:42,915 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1282189810] [2020-08-21 21:29:42,915 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:42,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:43,446 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:43,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:43,455 INFO L134 CoverageAnalysis]: Checked inductivity of 443 backedges. 2 proven. 441 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:29:43,455 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1282189810] [2020-08-21 21:29:43,455 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:43,456 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-21 21:29:43,456 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1289815478] [2020-08-21 21:29:43,456 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-21 21:29:43,456 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:43,457 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-21 21:29:43,457 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=532, Unknown=0, NotChecked=0, Total=600 [2020-08-21 21:29:43,457 INFO L87 Difference]: Start difference. First operand 58 states and 60 transitions. Second operand 25 states. [2020-08-21 21:29:44,269 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:44,269 INFO L93 Difference]: Finished difference Result 114 states and 119 transitions. [2020-08-21 21:29:44,270 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-21 21:29:44,270 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 57 [2020-08-21 21:29:44,270 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:44,271 INFO L225 Difference]: With dead ends: 114 [2020-08-21 21:29:44,271 INFO L226 Difference]: Without dead ends: 63 [2020-08-21 21:29:44,271 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=73, Invalid=577, Unknown=0, NotChecked=0, Total=650 [2020-08-21 21:29:44,272 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-08-21 21:29:44,277 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 60. [2020-08-21 21:29:44,277 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-08-21 21:29:44,277 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 62 transitions. [2020-08-21 21:29:44,278 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 62 transitions. Word has length 57 [2020-08-21 21:29:44,278 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:44,278 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 62 transitions. [2020-08-21 21:29:44,278 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-21 21:29:44,278 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 62 transitions. [2020-08-21 21:29:44,279 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2020-08-21 21:29:44,279 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:44,279 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:44,279 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-21 21:29:44,279 INFO L427 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:44,279 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:44,280 INFO L82 PathProgramCache]: Analyzing trace with hash -679577427, now seen corresponding path program 22 times [2020-08-21 21:29:44,280 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:44,280 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [649816060] [2020-08-21 21:29:44,280 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:44,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:44,882 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:44,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:44,891 INFO L134 CoverageAnalysis]: Checked inductivity of 486 backedges. 2 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:29:44,892 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [649816060] [2020-08-21 21:29:44,892 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:44,892 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-21 21:29:44,892 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1424315658] [2020-08-21 21:29:44,893 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-21 21:29:44,893 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:44,893 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-21 21:29:44,894 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=579, Unknown=0, NotChecked=0, Total=650 [2020-08-21 21:29:44,894 INFO L87 Difference]: Start difference. First operand 60 states and 62 transitions. Second operand 26 states. [2020-08-21 21:29:45,854 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:45,854 INFO L93 Difference]: Finished difference Result 118 states and 123 transitions. [2020-08-21 21:29:45,856 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-21 21:29:45,856 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 59 [2020-08-21 21:29:45,856 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:45,857 INFO L225 Difference]: With dead ends: 118 [2020-08-21 21:29:45,857 INFO L226 Difference]: Without dead ends: 65 [2020-08-21 21:29:45,858 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=76, Invalid=626, Unknown=0, NotChecked=0, Total=702 [2020-08-21 21:29:45,858 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2020-08-21 21:29:45,862 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 62. [2020-08-21 21:29:45,862 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2020-08-21 21:29:45,863 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 64 transitions. [2020-08-21 21:29:45,863 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 64 transitions. Word has length 59 [2020-08-21 21:29:45,863 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:45,863 INFO L479 AbstractCegarLoop]: Abstraction has 62 states and 64 transitions. [2020-08-21 21:29:45,863 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-21 21:29:45,863 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 64 transitions. [2020-08-21 21:29:45,864 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2020-08-21 21:29:45,864 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:45,864 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:45,864 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-21 21:29:45,864 INFO L427 AbstractCegarLoop]: === Iteration 27 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:45,864 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:45,865 INFO L82 PathProgramCache]: Analyzing trace with hash 462626827, now seen corresponding path program 23 times [2020-08-21 21:29:45,865 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:45,865 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [48775937] [2020-08-21 21:29:45,865 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:45,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:46,454 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:46,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:46,465 INFO L134 CoverageAnalysis]: Checked inductivity of 531 backedges. 2 proven. 529 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:29:46,465 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [48775937] [2020-08-21 21:29:46,466 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:46,466 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-21 21:29:46,467 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [479196417] [2020-08-21 21:29:46,467 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-21 21:29:46,467 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:46,467 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-21 21:29:46,468 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=628, Unknown=0, NotChecked=0, Total=702 [2020-08-21 21:29:46,468 INFO L87 Difference]: Start difference. First operand 62 states and 64 transitions. Second operand 27 states. [2020-08-21 21:29:47,607 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:47,607 INFO L93 Difference]: Finished difference Result 122 states and 127 transitions. [2020-08-21 21:29:47,611 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-21 21:29:47,611 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 61 [2020-08-21 21:29:47,611 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:47,612 INFO L225 Difference]: With dead ends: 122 [2020-08-21 21:29:47,612 INFO L226 Difference]: Without dead ends: 67 [2020-08-21 21:29:47,612 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=79, Invalid=677, Unknown=0, NotChecked=0, Total=756 [2020-08-21 21:29:47,613 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2020-08-21 21:29:47,616 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 64. [2020-08-21 21:29:47,617 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-08-21 21:29:47,617 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 66 transitions. [2020-08-21 21:29:47,617 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 66 transitions. Word has length 61 [2020-08-21 21:29:47,617 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:47,618 INFO L479 AbstractCegarLoop]: Abstraction has 64 states and 66 transitions. [2020-08-21 21:29:47,618 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-21 21:29:47,618 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 66 transitions. [2020-08-21 21:29:47,618 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2020-08-21 21:29:47,618 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:47,618 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:47,619 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-21 21:29:47,619 INFO L427 AbstractCegarLoop]: === Iteration 28 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:47,619 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:47,619 INFO L82 PathProgramCache]: Analyzing trace with hash -1390712855, now seen corresponding path program 24 times [2020-08-21 21:29:47,619 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:47,620 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1784645443] [2020-08-21 21:29:47,620 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:47,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:48,308 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:48,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:48,317 INFO L134 CoverageAnalysis]: Checked inductivity of 578 backedges. 2 proven. 576 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:29:48,318 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1784645443] [2020-08-21 21:29:48,318 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:48,318 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-21 21:29:48,318 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1604581059] [2020-08-21 21:29:48,319 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-21 21:29:48,319 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:48,319 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-21 21:29:48,319 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=679, Unknown=0, NotChecked=0, Total=756 [2020-08-21 21:29:48,319 INFO L87 Difference]: Start difference. First operand 64 states and 66 transitions. Second operand 28 states. [2020-08-21 21:29:49,415 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:49,416 INFO L93 Difference]: Finished difference Result 126 states and 131 transitions. [2020-08-21 21:29:49,420 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-21 21:29:49,420 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 63 [2020-08-21 21:29:49,420 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:49,421 INFO L225 Difference]: With dead ends: 126 [2020-08-21 21:29:49,421 INFO L226 Difference]: Without dead ends: 69 [2020-08-21 21:29:49,422 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=82, Invalid=730, Unknown=0, NotChecked=0, Total=812 [2020-08-21 21:29:49,422 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2020-08-21 21:29:49,426 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 66. [2020-08-21 21:29:49,426 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-08-21 21:29:49,427 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 68 transitions. [2020-08-21 21:29:49,427 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 68 transitions. Word has length 63 [2020-08-21 21:29:49,427 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:49,427 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 68 transitions. [2020-08-21 21:29:49,427 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-21 21:29:49,427 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 68 transitions. [2020-08-21 21:29:49,428 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-08-21 21:29:49,428 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:49,428 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:49,428 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-21 21:29:49,428 INFO L427 AbstractCegarLoop]: === Iteration 29 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:49,428 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:49,429 INFO L82 PathProgramCache]: Analyzing trace with hash -38719417, now seen corresponding path program 25 times [2020-08-21 21:29:49,429 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:49,429 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [718014520] [2020-08-21 21:29:49,429 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:49,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:50,261 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:50,263 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:50,280 INFO L134 CoverageAnalysis]: Checked inductivity of 627 backedges. 2 proven. 625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:29:50,281 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [718014520] [2020-08-21 21:29:50,281 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:50,281 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-21 21:29:50,281 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [303113485] [2020-08-21 21:29:50,282 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-21 21:29:50,282 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:50,283 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-21 21:29:50,283 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=732, Unknown=0, NotChecked=0, Total=812 [2020-08-21 21:29:50,284 INFO L87 Difference]: Start difference. First operand 66 states and 68 transitions. Second operand 29 states. [2020-08-21 21:29:52,152 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:52,152 INFO L93 Difference]: Finished difference Result 130 states and 135 transitions. [2020-08-21 21:29:52,153 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-21 21:29:52,153 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 65 [2020-08-21 21:29:52,153 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:52,154 INFO L225 Difference]: With dead ends: 130 [2020-08-21 21:29:52,154 INFO L226 Difference]: Without dead ends: 71 [2020-08-21 21:29:52,155 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=85, Invalid=785, Unknown=0, NotChecked=0, Total=870 [2020-08-21 21:29:52,155 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2020-08-21 21:29:52,160 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 68. [2020-08-21 21:29:52,160 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2020-08-21 21:29:52,161 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 70 transitions. [2020-08-21 21:29:52,161 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 70 transitions. Word has length 65 [2020-08-21 21:29:52,161 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:52,161 INFO L479 AbstractCegarLoop]: Abstraction has 68 states and 70 transitions. [2020-08-21 21:29:52,162 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-21 21:29:52,162 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 70 transitions. [2020-08-21 21:29:52,162 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-08-21 21:29:52,162 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:52,163 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:52,163 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-21 21:29:52,163 INFO L427 AbstractCegarLoop]: === Iteration 30 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:52,163 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:52,164 INFO L82 PathProgramCache]: Analyzing trace with hash 2146851109, now seen corresponding path program 26 times [2020-08-21 21:29:52,164 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:52,164 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [367482939] [2020-08-21 21:29:52,164 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:52,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:52,989 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:52,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:53,003 INFO L134 CoverageAnalysis]: Checked inductivity of 678 backedges. 2 proven. 676 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:29:53,005 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [367482939] [2020-08-21 21:29:53,005 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:53,005 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-21 21:29:53,005 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [442526054] [2020-08-21 21:29:53,006 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-21 21:29:53,006 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:53,007 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-21 21:29:53,007 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=787, Unknown=0, NotChecked=0, Total=870 [2020-08-21 21:29:53,007 INFO L87 Difference]: Start difference. First operand 68 states and 70 transitions. Second operand 30 states. [2020-08-21 21:29:54,324 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:54,325 INFO L93 Difference]: Finished difference Result 134 states and 139 transitions. [2020-08-21 21:29:54,333 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-21 21:29:54,333 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 67 [2020-08-21 21:29:54,333 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:54,334 INFO L225 Difference]: With dead ends: 134 [2020-08-21 21:29:54,334 INFO L226 Difference]: Without dead ends: 73 [2020-08-21 21:29:54,335 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=88, Invalid=842, Unknown=0, NotChecked=0, Total=930 [2020-08-21 21:29:54,335 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-08-21 21:29:54,340 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 70. [2020-08-21 21:29:54,340 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-08-21 21:29:54,340 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 72 transitions. [2020-08-21 21:29:54,341 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 72 transitions. Word has length 67 [2020-08-21 21:29:54,341 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:54,341 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 72 transitions. [2020-08-21 21:29:54,341 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-21 21:29:54,341 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 72 transitions. [2020-08-21 21:29:54,342 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-08-21 21:29:54,342 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:54,342 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:54,342 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-21 21:29:54,342 INFO L427 AbstractCegarLoop]: === Iteration 31 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:54,342 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:54,343 INFO L82 PathProgramCache]: Analyzing trace with hash -2053848445, now seen corresponding path program 27 times [2020-08-21 21:29:54,343 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:54,343 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [31210394] [2020-08-21 21:29:54,343 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:54,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:55,164 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:55,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:55,174 INFO L134 CoverageAnalysis]: Checked inductivity of 731 backedges. 2 proven. 729 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:29:55,175 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [31210394] [2020-08-21 21:29:55,175 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:55,175 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-21 21:29:55,175 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1438432376] [2020-08-21 21:29:55,175 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-21 21:29:55,176 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:55,176 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-21 21:29:55,176 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=844, Unknown=0, NotChecked=0, Total=930 [2020-08-21 21:29:55,176 INFO L87 Difference]: Start difference. First operand 70 states and 72 transitions. Second operand 31 states. [2020-08-21 21:29:56,534 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:56,535 INFO L93 Difference]: Finished difference Result 138 states and 143 transitions. [2020-08-21 21:29:56,540 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-21 21:29:56,540 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 69 [2020-08-21 21:29:56,540 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:56,541 INFO L225 Difference]: With dead ends: 138 [2020-08-21 21:29:56,541 INFO L226 Difference]: Without dead ends: 75 [2020-08-21 21:29:56,542 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=91, Invalid=901, Unknown=0, NotChecked=0, Total=992 [2020-08-21 21:29:56,542 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2020-08-21 21:29:56,546 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 72. [2020-08-21 21:29:56,546 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2020-08-21 21:29:56,547 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 74 transitions. [2020-08-21 21:29:56,547 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 74 transitions. Word has length 69 [2020-08-21 21:29:56,547 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:56,547 INFO L479 AbstractCegarLoop]: Abstraction has 72 states and 74 transitions. [2020-08-21 21:29:56,548 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-21 21:29:56,548 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 74 transitions. [2020-08-21 21:29:56,548 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2020-08-21 21:29:56,548 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:56,548 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:56,549 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-21 21:29:56,549 INFO L427 AbstractCegarLoop]: === Iteration 32 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:56,549 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:56,549 INFO L82 PathProgramCache]: Analyzing trace with hash -1656861599, now seen corresponding path program 28 times [2020-08-21 21:29:56,549 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:56,550 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1583040028] [2020-08-21 21:29:56,550 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:56,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:57,448 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:57,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:57,462 INFO L134 CoverageAnalysis]: Checked inductivity of 786 backedges. 2 proven. 784 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:29:57,462 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1583040028] [2020-08-21 21:29:57,463 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:57,463 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-21 21:29:57,463 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [903936672] [2020-08-21 21:29:57,463 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-21 21:29:57,464 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:57,464 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-21 21:29:57,464 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=903, Unknown=0, NotChecked=0, Total=992 [2020-08-21 21:29:57,465 INFO L87 Difference]: Start difference. First operand 72 states and 74 transitions. Second operand 32 states. [2020-08-21 21:29:58,985 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:58,986 INFO L93 Difference]: Finished difference Result 142 states and 147 transitions. [2020-08-21 21:29:58,988 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-21 21:29:58,988 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 71 [2020-08-21 21:29:58,988 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:58,989 INFO L225 Difference]: With dead ends: 142 [2020-08-21 21:29:58,989 INFO L226 Difference]: Without dead ends: 77 [2020-08-21 21:29:58,990 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=94, Invalid=962, Unknown=0, NotChecked=0, Total=1056 [2020-08-21 21:29:58,990 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2020-08-21 21:29:58,994 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 74. [2020-08-21 21:29:58,994 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2020-08-21 21:29:58,995 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 76 transitions. [2020-08-21 21:29:58,995 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 76 transitions. Word has length 71 [2020-08-21 21:29:58,995 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:58,995 INFO L479 AbstractCegarLoop]: Abstraction has 74 states and 76 transitions. [2020-08-21 21:29:58,996 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-21 21:29:58,996 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 76 transitions. [2020-08-21 21:29:58,996 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2020-08-21 21:29:58,996 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:58,997 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:58,997 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-21 21:29:58,997 INFO L427 AbstractCegarLoop]: === Iteration 33 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:58,997 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:58,997 INFO L82 PathProgramCache]: Analyzing trace with hash 1890375359, now seen corresponding path program 29 times [2020-08-21 21:29:58,997 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:58,998 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2001313188] [2020-08-21 21:29:58,998 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:59,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:59,925 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:59,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:59,935 INFO L134 CoverageAnalysis]: Checked inductivity of 843 backedges. 2 proven. 841 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:29:59,936 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2001313188] [2020-08-21 21:29:59,936 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:59,936 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-21 21:29:59,936 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1469443207] [2020-08-21 21:29:59,936 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-21 21:29:59,936 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:59,937 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-21 21:29:59,937 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=964, Unknown=0, NotChecked=0, Total=1056 [2020-08-21 21:29:59,937 INFO L87 Difference]: Start difference. First operand 74 states and 76 transitions. Second operand 33 states. [2020-08-21 21:30:01,605 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:01,606 INFO L93 Difference]: Finished difference Result 146 states and 151 transitions. [2020-08-21 21:30:01,609 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-21 21:30:01,609 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 73 [2020-08-21 21:30:01,610 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:01,610 INFO L225 Difference]: With dead ends: 146 [2020-08-21 21:30:01,611 INFO L226 Difference]: Without dead ends: 79 [2020-08-21 21:30:01,612 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=97, Invalid=1025, Unknown=0, NotChecked=0, Total=1122 [2020-08-21 21:30:01,615 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2020-08-21 21:30:01,627 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 76. [2020-08-21 21:30:01,627 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-08-21 21:30:01,628 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 78 transitions. [2020-08-21 21:30:01,632 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 78 transitions. Word has length 73 [2020-08-21 21:30:01,632 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:01,632 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 78 transitions. [2020-08-21 21:30:01,632 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-21 21:30:01,633 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 78 transitions. [2020-08-21 21:30:01,633 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2020-08-21 21:30:01,633 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:01,634 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:01,635 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-21 21:30:01,635 INFO L427 AbstractCegarLoop]: === Iteration 34 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:01,635 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:01,635 INFO L82 PathProgramCache]: Analyzing trace with hash 581058973, now seen corresponding path program 30 times [2020-08-21 21:30:01,638 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:01,638 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [958985140] [2020-08-21 21:30:01,638 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:01,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:02,681 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:02,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:02,696 INFO L134 CoverageAnalysis]: Checked inductivity of 902 backedges. 2 proven. 900 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:02,696 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [958985140] [2020-08-21 21:30:02,696 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:02,696 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-21 21:30:02,697 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1592679680] [2020-08-21 21:30:02,697 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-21 21:30:02,697 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:02,697 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-21 21:30:02,698 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=1027, Unknown=0, NotChecked=0, Total=1122 [2020-08-21 21:30:02,698 INFO L87 Difference]: Start difference. First operand 76 states and 78 transitions. Second operand 34 states. [2020-08-21 21:30:04,517 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:04,518 INFO L93 Difference]: Finished difference Result 150 states and 155 transitions. [2020-08-21 21:30:04,518 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-21 21:30:04,518 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 75 [2020-08-21 21:30:04,518 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:04,519 INFO L225 Difference]: With dead ends: 150 [2020-08-21 21:30:04,519 INFO L226 Difference]: Without dead ends: 81 [2020-08-21 21:30:04,520 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=100, Invalid=1090, Unknown=0, NotChecked=0, Total=1190 [2020-08-21 21:30:04,520 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2020-08-21 21:30:04,525 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 78. [2020-08-21 21:30:04,526 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2020-08-21 21:30:04,526 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 80 transitions. [2020-08-21 21:30:04,526 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 80 transitions. Word has length 75 [2020-08-21 21:30:04,526 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:04,527 INFO L479 AbstractCegarLoop]: Abstraction has 78 states and 80 transitions. [2020-08-21 21:30:04,527 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-21 21:30:04,527 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 80 transitions. [2020-08-21 21:30:04,527 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2020-08-21 21:30:04,528 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:04,528 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:04,528 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-21 21:30:04,528 INFO L427 AbstractCegarLoop]: === Iteration 35 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:04,528 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:04,528 INFO L82 PathProgramCache]: Analyzing trace with hash 753429755, now seen corresponding path program 31 times [2020-08-21 21:30:04,529 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:04,529 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2122785897] [2020-08-21 21:30:04,529 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:04,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:05,565 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:05,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:05,577 INFO L134 CoverageAnalysis]: Checked inductivity of 963 backedges. 2 proven. 961 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:05,577 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2122785897] [2020-08-21 21:30:05,578 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:05,578 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-21 21:30:05,578 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2027480291] [2020-08-21 21:30:05,579 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-21 21:30:05,579 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:05,579 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-21 21:30:05,580 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=1092, Unknown=0, NotChecked=0, Total=1190 [2020-08-21 21:30:05,580 INFO L87 Difference]: Start difference. First operand 78 states and 80 transitions. Second operand 35 states. [2020-08-21 21:30:07,409 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:07,410 INFO L93 Difference]: Finished difference Result 154 states and 159 transitions. [2020-08-21 21:30:07,410 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-21 21:30:07,410 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 77 [2020-08-21 21:30:07,411 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:07,411 INFO L225 Difference]: With dead ends: 154 [2020-08-21 21:30:07,412 INFO L226 Difference]: Without dead ends: 83 [2020-08-21 21:30:07,413 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=103, Invalid=1157, Unknown=0, NotChecked=0, Total=1260 [2020-08-21 21:30:07,413 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2020-08-21 21:30:07,418 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 80. [2020-08-21 21:30:07,418 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2020-08-21 21:30:07,419 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 82 transitions. [2020-08-21 21:30:07,419 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 82 transitions. Word has length 77 [2020-08-21 21:30:07,419 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:07,419 INFO L479 AbstractCegarLoop]: Abstraction has 80 states and 82 transitions. [2020-08-21 21:30:07,420 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-21 21:30:07,420 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 82 transitions. [2020-08-21 21:30:07,420 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2020-08-21 21:30:07,420 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:07,421 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:07,421 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-21 21:30:07,421 INFO L427 AbstractCegarLoop]: === Iteration 36 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:07,421 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:07,421 INFO L82 PathProgramCache]: Analyzing trace with hash -1101973287, now seen corresponding path program 32 times [2020-08-21 21:30:07,421 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:07,422 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [765243012] [2020-08-21 21:30:07,422 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:07,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:08,474 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:08,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:08,486 INFO L134 CoverageAnalysis]: Checked inductivity of 1026 backedges. 2 proven. 1024 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:08,486 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [765243012] [2020-08-21 21:30:08,486 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:08,486 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-21 21:30:08,486 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1200846404] [2020-08-21 21:30:08,487 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-21 21:30:08,487 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:08,487 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-21 21:30:08,487 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=1159, Unknown=0, NotChecked=0, Total=1260 [2020-08-21 21:30:08,487 INFO L87 Difference]: Start difference. First operand 80 states and 82 transitions. Second operand 36 states. [2020-08-21 21:30:10,466 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:10,467 INFO L93 Difference]: Finished difference Result 158 states and 163 transitions. [2020-08-21 21:30:10,467 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-21 21:30:10,467 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 79 [2020-08-21 21:30:10,468 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:10,468 INFO L225 Difference]: With dead ends: 158 [2020-08-21 21:30:10,468 INFO L226 Difference]: Without dead ends: 85 [2020-08-21 21:30:10,469 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=106, Invalid=1226, Unknown=0, NotChecked=0, Total=1332 [2020-08-21 21:30:10,469 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2020-08-21 21:30:10,474 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 82. [2020-08-21 21:30:10,474 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2020-08-21 21:30:10,475 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 84 transitions. [2020-08-21 21:30:10,475 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 84 transitions. Word has length 79 [2020-08-21 21:30:10,475 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:10,475 INFO L479 AbstractCegarLoop]: Abstraction has 82 states and 84 transitions. [2020-08-21 21:30:10,476 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-21 21:30:10,476 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 84 transitions. [2020-08-21 21:30:10,476 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2020-08-21 21:30:10,476 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:10,477 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:10,477 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-21 21:30:10,477 INFO L427 AbstractCegarLoop]: === Iteration 37 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:10,477 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:10,477 INFO L82 PathProgramCache]: Analyzing trace with hash -1732868809, now seen corresponding path program 33 times [2020-08-21 21:30:10,478 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:10,478 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [192318222] [2020-08-21 21:30:10,478 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:10,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:11,673 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:11,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:11,686 INFO L134 CoverageAnalysis]: Checked inductivity of 1091 backedges. 2 proven. 1089 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:11,687 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [192318222] [2020-08-21 21:30:11,687 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:11,687 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-21 21:30:11,687 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1497388156] [2020-08-21 21:30:11,687 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-21 21:30:11,687 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:11,688 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-21 21:30:11,688 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=1228, Unknown=0, NotChecked=0, Total=1332 [2020-08-21 21:30:11,688 INFO L87 Difference]: Start difference. First operand 82 states and 84 transitions. Second operand 37 states. [2020-08-21 21:30:13,604 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:13,604 INFO L93 Difference]: Finished difference Result 162 states and 167 transitions. [2020-08-21 21:30:13,610 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-21 21:30:13,610 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 81 [2020-08-21 21:30:13,611 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:13,611 INFO L225 Difference]: With dead ends: 162 [2020-08-21 21:30:13,611 INFO L226 Difference]: Without dead ends: 87 [2020-08-21 21:30:13,612 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=109, Invalid=1297, Unknown=0, NotChecked=0, Total=1406 [2020-08-21 21:30:13,613 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2020-08-21 21:30:13,619 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 84. [2020-08-21 21:30:13,619 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2020-08-21 21:30:13,619 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 86 transitions. [2020-08-21 21:30:13,620 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 86 transitions. Word has length 81 [2020-08-21 21:30:13,620 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:13,620 INFO L479 AbstractCegarLoop]: Abstraction has 84 states and 86 transitions. [2020-08-21 21:30:13,620 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-21 21:30:13,620 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 86 transitions. [2020-08-21 21:30:13,620 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2020-08-21 21:30:13,621 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:13,621 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:13,621 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-21 21:30:13,621 INFO L427 AbstractCegarLoop]: === Iteration 38 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:13,621 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:13,621 INFO L82 PathProgramCache]: Analyzing trace with hash 1861890581, now seen corresponding path program 34 times [2020-08-21 21:30:13,621 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:13,621 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [99411393] [2020-08-21 21:30:13,622 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:13,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:14,888 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:14,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:14,901 INFO L134 CoverageAnalysis]: Checked inductivity of 1158 backedges. 2 proven. 1156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:14,901 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [99411393] [2020-08-21 21:30:14,901 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:14,901 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-21 21:30:14,902 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [175507517] [2020-08-21 21:30:14,902 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-21 21:30:14,902 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:14,903 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-21 21:30:14,903 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=1299, Unknown=0, NotChecked=0, Total=1406 [2020-08-21 21:30:14,903 INFO L87 Difference]: Start difference. First operand 84 states and 86 transitions. Second operand 38 states. [2020-08-21 21:30:17,031 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:17,031 INFO L93 Difference]: Finished difference Result 166 states and 171 transitions. [2020-08-21 21:30:17,034 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-21 21:30:17,034 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 83 [2020-08-21 21:30:17,034 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:17,035 INFO L225 Difference]: With dead ends: 166 [2020-08-21 21:30:17,035 INFO L226 Difference]: Without dead ends: 89 [2020-08-21 21:30:17,036 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=112, Invalid=1370, Unknown=0, NotChecked=0, Total=1482 [2020-08-21 21:30:17,036 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2020-08-21 21:30:17,041 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 86. [2020-08-21 21:30:17,041 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2020-08-21 21:30:17,041 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 88 transitions. [2020-08-21 21:30:17,042 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 88 transitions. Word has length 83 [2020-08-21 21:30:17,042 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:17,042 INFO L479 AbstractCegarLoop]: Abstraction has 86 states and 88 transitions. [2020-08-21 21:30:17,042 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-21 21:30:17,042 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 88 transitions. [2020-08-21 21:30:17,043 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2020-08-21 21:30:17,043 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:17,043 INFO L422 BasicCegarLoop]: trace histogram [35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:17,043 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-21 21:30:17,043 INFO L427 AbstractCegarLoop]: === Iteration 39 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:17,044 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:17,044 INFO L82 PathProgramCache]: Analyzing trace with hash -1023008909, now seen corresponding path program 35 times [2020-08-21 21:30:17,044 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:17,044 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [655614574] [2020-08-21 21:30:17,044 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:17,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:18,451 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:18,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:18,465 INFO L134 CoverageAnalysis]: Checked inductivity of 1227 backedges. 2 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:18,465 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [655614574] [2020-08-21 21:30:18,465 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:18,466 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-21 21:30:18,466 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [250241390] [2020-08-21 21:30:18,466 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-21 21:30:18,466 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:18,466 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-21 21:30:18,467 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=1372, Unknown=0, NotChecked=0, Total=1482 [2020-08-21 21:30:18,467 INFO L87 Difference]: Start difference. First operand 86 states and 88 transitions. Second operand 39 states. [2020-08-21 21:30:20,637 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:20,637 INFO L93 Difference]: Finished difference Result 170 states and 175 transitions. [2020-08-21 21:30:20,646 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-21 21:30:20,647 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 85 [2020-08-21 21:30:20,647 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:20,648 INFO L225 Difference]: With dead ends: 170 [2020-08-21 21:30:20,649 INFO L226 Difference]: Without dead ends: 91 [2020-08-21 21:30:20,650 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=115, Invalid=1445, Unknown=0, NotChecked=0, Total=1560 [2020-08-21 21:30:20,651 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2020-08-21 21:30:20,659 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 88. [2020-08-21 21:30:20,661 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2020-08-21 21:30:20,661 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 90 transitions. [2020-08-21 21:30:20,662 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 90 transitions. Word has length 85 [2020-08-21 21:30:20,662 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:20,662 INFO L479 AbstractCegarLoop]: Abstraction has 88 states and 90 transitions. [2020-08-21 21:30:20,662 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-21 21:30:20,662 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 90 transitions. [2020-08-21 21:30:20,663 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2020-08-21 21:30:20,663 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:20,663 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:20,664 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-21 21:30:20,664 INFO L427 AbstractCegarLoop]: === Iteration 40 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:20,664 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:20,664 INFO L82 PathProgramCache]: Analyzing trace with hash 1137454417, now seen corresponding path program 36 times [2020-08-21 21:30:20,664 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:20,664 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1092991275] [2020-08-21 21:30:20,665 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:20,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:22,102 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:22,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:22,116 INFO L134 CoverageAnalysis]: Checked inductivity of 1298 backedges. 2 proven. 1296 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:22,116 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1092991275] [2020-08-21 21:30:22,116 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:22,116 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-21 21:30:22,116 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [236418022] [2020-08-21 21:30:22,117 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-21 21:30:22,117 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:22,117 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-21 21:30:22,118 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=1447, Unknown=0, NotChecked=0, Total=1560 [2020-08-21 21:30:22,118 INFO L87 Difference]: Start difference. First operand 88 states and 90 transitions. Second operand 40 states. [2020-08-21 21:30:24,499 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:24,501 INFO L93 Difference]: Finished difference Result 174 states and 179 transitions. [2020-08-21 21:30:24,501 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-21 21:30:24,502 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 87 [2020-08-21 21:30:24,502 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:24,502 INFO L225 Difference]: With dead ends: 174 [2020-08-21 21:30:24,503 INFO L226 Difference]: Without dead ends: 93 [2020-08-21 21:30:24,504 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=118, Invalid=1522, Unknown=0, NotChecked=0, Total=1640 [2020-08-21 21:30:24,504 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2020-08-21 21:30:24,514 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 90. [2020-08-21 21:30:24,514 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2020-08-21 21:30:24,515 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 92 transitions. [2020-08-21 21:30:24,515 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 92 transitions. Word has length 87 [2020-08-21 21:30:24,515 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:24,515 INFO L479 AbstractCegarLoop]: Abstraction has 90 states and 92 transitions. [2020-08-21 21:30:24,515 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-21 21:30:24,515 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 92 transitions. [2020-08-21 21:30:24,519 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2020-08-21 21:30:24,519 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:24,519 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:24,519 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-21 21:30:24,520 INFO L427 AbstractCegarLoop]: === Iteration 41 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:24,520 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:24,520 INFO L82 PathProgramCache]: Analyzing trace with hash -1421460561, now seen corresponding path program 37 times [2020-08-21 21:30:24,520 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:24,520 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [593442890] [2020-08-21 21:30:24,520 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:24,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:26,020 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:26,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:26,034 INFO L134 CoverageAnalysis]: Checked inductivity of 1371 backedges. 2 proven. 1369 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:26,035 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [593442890] [2020-08-21 21:30:26,035 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:26,035 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-21 21:30:26,035 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [917300266] [2020-08-21 21:30:26,035 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-21 21:30:26,035 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:26,036 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-21 21:30:26,036 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=1524, Unknown=0, NotChecked=0, Total=1640 [2020-08-21 21:30:26,036 INFO L87 Difference]: Start difference. First operand 90 states and 92 transitions. Second operand 41 states.