/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5 --traceabstraction.additional.smt.options interpolation-heuristic=SHALLOWEST -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/simple_4-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-18 20:25:44,977 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-18 20:25:44,981 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-18 20:25:45,018 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-18 20:25:45,018 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-18 20:25:45,027 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-18 20:25:45,029 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-18 20:25:45,033 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-18 20:25:45,035 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-18 20:25:45,039 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-18 20:25:45,040 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-18 20:25:45,041 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-18 20:25:45,041 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 20:25:45,044 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 20:25:45,046 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 20:25:45,048 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 20:25:45,050 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 20:25:45,050 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 20:25:45,052 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 20:25:45,061 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 20:25:45,064 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 20:25:45,065 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 20:25:45,065 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 20:25:45,066 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 20:25:45,077 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-18 20:25:45,082 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-08-18 20:25:45,083 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-08-18 20:25:45,084 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-08-18 20:25:45,085 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-08-18 20:25:45,085 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-08-18 20:25:45,086 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-08-18 20:25:45,086 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-08-18 20:25:45,086 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-08-18 20:25:45,087 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 20:25:45,088 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 20:25:45,089 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 20:25:45,090 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 [2020-08-18 20:25:45,130 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 20:25:45,131 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 20:25:45,133 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 20:25:45,133 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 20:25:45,133 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 20:25:45,134 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 20:25:45,134 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 20:25:45,134 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 20:25:45,134 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 20:25:45,134 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 20:25:45,136 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 20:25:45,136 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 20:25:45,136 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 20:25:45,136 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 20:25:45,137 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 20:25:45,137 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 20:25:45,137 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 20:25:45,137 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 20:25:45,137 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 20:25:45,138 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 20:25:45,138 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 20:25:45,138 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 20:25:45,138 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 20:25:45,138 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 20:25:45,139 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 20:25:45,139 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 20:25:45,139 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 20:25:45,139 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 20:25:45,139 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 20:25:45,140 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SHALLOWEST; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SHALLOWEST; [2020-08-18 20:25:45,421 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 20:25:45,434 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 20:25:45,437 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 20:25:45,439 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 20:25:45,439 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 20:25:45,440 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/simple_4-2.c [2020-08-18 20:25:45,512 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/9252c077b/cf5a747aa19c4b4d9cfb405bc1e7669c/FLAG3cb8e0f5e [2020-08-18 20:25:45,958 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 20:25:45,959 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-acceleration/simple_4-2.c [2020-08-18 20:25:45,965 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/9252c077b/cf5a747aa19c4b4d9cfb405bc1e7669c/FLAG3cb8e0f5e [2020-08-18 20:25:46,368 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/9252c077b/cf5a747aa19c4b4d9cfb405bc1e7669c [2020-08-18 20:25:46,377 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 20:25:46,379 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 20:25:46,380 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 20:25:46,380 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 20:25:46,383 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 20:25:46,384 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 08:25:46" (1/1) ... [2020-08-18 20:25:46,387 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@535f0987 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:25:46, skipping insertion in model container [2020-08-18 20:25:46,388 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 08:25:46" (1/1) ... [2020-08-18 20:25:46,396 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 20:25:46,413 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 20:25:46,595 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 20:25:46,600 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 20:25:46,612 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 20:25:46,625 INFO L208 MainTranslator]: Completed translation [2020-08-18 20:25:46,626 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:25:46 WrapperNode [2020-08-18 20:25:46,626 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 20:25:46,627 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 20:25:46,627 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 20:25:46,627 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 20:25:46,637 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:25:46" (1/1) ... [2020-08-18 20:25:46,637 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:25:46" (1/1) ... [2020-08-18 20:25:46,717 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:25:46" (1/1) ... [2020-08-18 20:25:46,717 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:25:46" (1/1) ... [2020-08-18 20:25:46,721 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:25:46" (1/1) ... [2020-08-18 20:25:46,726 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:25:46" (1/1) ... [2020-08-18 20:25:46,726 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:25:46" (1/1) ... [2020-08-18 20:25:46,727 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 20:25:46,728 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 20:25:46,728 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 20:25:46,728 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 20:25:46,729 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:25:46" (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 [2020-08-18 20:25:46,794 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 20:25:46,794 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 20:25:46,794 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-18 20:25:46,794 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 20:25:46,794 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 20:25:46,795 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-18 20:25:46,795 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 20:25:46,795 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 20:25:46,795 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 20:25:46,954 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 20:25:46,954 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-18 20:25:46,957 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 08:25:46 BoogieIcfgContainer [2020-08-18 20:25:46,958 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 20:25:46,959 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 20:25:46,959 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 20:25:46,962 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 20:25:46,963 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 08:25:46" (1/3) ... [2020-08-18 20:25:46,969 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2a6e6e68 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 08:25:46, skipping insertion in model container [2020-08-18 20:25:46,969 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:25:46" (2/3) ... [2020-08-18 20:25:46,970 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2a6e6e68 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 08:25:46, skipping insertion in model container [2020-08-18 20:25:46,970 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 08:25:46" (3/3) ... [2020-08-18 20:25:46,973 INFO L109 eAbstractionObserver]: Analyzing ICFG simple_4-2.c [2020-08-18 20:25:46,984 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 20:25:46,992 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-18 20:25:47,007 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-18 20:25:47,028 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 20:25:47,028 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 20:25:47,028 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 20:25:47,029 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 20:25:47,029 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 20:25:47,029 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 20:25:47,029 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 20:25:47,029 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 20:25:47,045 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2020-08-18 20:25:47,050 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-18 20:25:47,050 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:47,051 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:47,052 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:47,057 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:47,057 INFO L82 PathProgramCache]: Analyzing trace with hash 1846144830, now seen corresponding path program 1 times [2020-08-18 20:25:47,064 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:47,064 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [694375115] [2020-08-18 20:25:47,065 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:47,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:47,337 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 12 DAG size of output: 8 [2020-08-18 20:25:47,339 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:47,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:47,345 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:25:47,346 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [694375115] [2020-08-18 20:25:47,348 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 20:25:47,348 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-18 20:25:47,350 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1394384242] [2020-08-18 20:25:47,356 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-18 20:25:47,374 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:47,388 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-18 20:25:47,389 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 20:25:47,390 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 3 states. [2020-08-18 20:25:47,418 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:47,418 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2020-08-18 20:25:47,419 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-18 20:25:47,421 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-08-18 20:25:47,421 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:47,429 INFO L225 Difference]: With dead ends: 29 [2020-08-18 20:25:47,430 INFO L226 Difference]: Without dead ends: 12 [2020-08-18 20:25:47,433 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 20:25:47,455 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2020-08-18 20:25:47,469 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2020-08-18 20:25:47,472 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2020-08-18 20:25:47,473 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2020-08-18 20:25:47,476 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2020-08-18 20:25:47,477 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:47,477 INFO L479 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2020-08-18 20:25:47,478 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-18 20:25:47,478 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2020-08-18 20:25:47,480 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-08-18 20:25:47,480 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:47,481 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:47,481 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 20:25:47,484 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:47,484 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:47,485 INFO L82 PathProgramCache]: Analyzing trace with hash 1432376145, now seen corresponding path program 1 times [2020-08-18 20:25:47,485 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:47,488 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [126351834] [2020-08-18 20:25:47,488 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:47,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:47,590 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:47,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:47,596 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:25:47,596 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [126351834] [2020-08-18 20:25:47,597 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:47,597 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2020-08-18 20:25:47,597 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1793109662] [2020-08-18 20:25:47,599 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 20:25:47,606 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:47,606 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 20:25:47,606 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-18 20:25:47,607 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 4 states. [2020-08-18 20:25:47,634 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:47,634 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2020-08-18 20:25:47,636 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-18 20:25:47,636 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 11 [2020-08-18 20:25:47,636 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:47,637 INFO L225 Difference]: With dead ends: 18 [2020-08-18 20:25:47,638 INFO L226 Difference]: Without dead ends: 13 [2020-08-18 20:25:47,639 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-18 20:25:47,639 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-08-18 20:25:47,643 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-08-18 20:25:47,643 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-08-18 20:25:47,644 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2020-08-18 20:25:47,645 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 11 [2020-08-18 20:25:47,645 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:47,645 INFO L479 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2020-08-18 20:25:47,645 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 20:25:47,645 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2020-08-18 20:25:47,646 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-18 20:25:47,646 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:47,647 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:47,647 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 20:25:47,648 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:47,648 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:47,649 INFO L82 PathProgramCache]: Analyzing trace with hash 1490448798, now seen corresponding path program 2 times [2020-08-18 20:25:47,649 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:47,649 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1212363253] [2020-08-18 20:25:47,649 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:47,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:47,739 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:47,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:47,743 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:25:47,743 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1212363253] [2020-08-18 20:25:47,743 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:47,744 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-18 20:25:47,744 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [774011436] [2020-08-18 20:25:47,744 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 20:25:47,745 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:47,745 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 20:25:47,745 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-18 20:25:47,746 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 5 states. [2020-08-18 20:25:47,773 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:47,773 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2020-08-18 20:25:47,774 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 20:25:47,774 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 12 [2020-08-18 20:25:47,774 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:47,775 INFO L225 Difference]: With dead ends: 19 [2020-08-18 20:25:47,775 INFO L226 Difference]: Without dead ends: 14 [2020-08-18 20:25:47,776 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-18 20:25:47,776 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-08-18 20:25:47,780 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-08-18 20:25:47,780 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-08-18 20:25:47,781 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2020-08-18 20:25:47,781 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2020-08-18 20:25:47,781 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:47,781 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2020-08-18 20:25:47,782 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 20:25:47,782 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2020-08-18 20:25:47,782 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-18 20:25:47,782 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:47,783 INFO L422 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:47,783 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-18 20:25:47,783 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:47,783 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:47,784 INFO L82 PathProgramCache]: Analyzing trace with hash -1004266255, now seen corresponding path program 3 times [2020-08-18 20:25:47,784 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:47,784 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1722042602] [2020-08-18 20:25:47,785 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:47,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:47,892 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:47,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:47,895 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:25:47,896 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1722042602] [2020-08-18 20:25:47,896 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:47,896 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-18 20:25:47,896 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1600822556] [2020-08-18 20:25:47,897 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 20:25:47,897 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:47,897 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 20:25:47,898 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-18 20:25:47,898 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 6 states. [2020-08-18 20:25:47,926 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:47,926 INFO L93 Difference]: Finished difference Result 20 states and 20 transitions. [2020-08-18 20:25:47,927 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-18 20:25:47,927 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 13 [2020-08-18 20:25:47,927 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:47,928 INFO L225 Difference]: With dead ends: 20 [2020-08-18 20:25:47,928 INFO L226 Difference]: Without dead ends: 15 [2020-08-18 20:25:47,928 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-18 20:25:47,929 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-18 20:25:47,932 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-18 20:25:47,933 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-18 20:25:47,933 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2020-08-18 20:25:47,934 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 13 [2020-08-18 20:25:47,934 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:47,934 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2020-08-18 20:25:47,934 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 20:25:47,934 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2020-08-18 20:25:47,935 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-08-18 20:25:47,935 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:47,935 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:47,935 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-18 20:25:47,936 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:47,936 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:47,936 INFO L82 PathProgramCache]: Analyzing trace with hash -1031021570, now seen corresponding path program 4 times [2020-08-18 20:25:47,936 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:47,937 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [682208732] [2020-08-18 20:25:47,937 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:47,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:48,068 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:48,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:48,077 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:25:48,081 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [682208732] [2020-08-18 20:25:48,081 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:48,081 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-18 20:25:48,083 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [990572682] [2020-08-18 20:25:48,083 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-18 20:25:48,084 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:48,084 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-18 20:25:48,084 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-08-18 20:25:48,085 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 7 states. [2020-08-18 20:25:48,141 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:48,141 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2020-08-18 20:25:48,143 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-18 20:25:48,143 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 14 [2020-08-18 20:25:48,143 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:48,144 INFO L225 Difference]: With dead ends: 21 [2020-08-18 20:25:48,144 INFO L226 Difference]: Without dead ends: 16 [2020-08-18 20:25:48,145 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-08-18 20:25:48,146 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-18 20:25:48,153 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-08-18 20:25:48,154 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-18 20:25:48,155 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2020-08-18 20:25:48,155 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 14 [2020-08-18 20:25:48,155 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:48,156 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2020-08-18 20:25:48,156 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-18 20:25:48,156 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2020-08-18 20:25:48,156 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-18 20:25:48,157 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:48,158 INFO L422 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:48,158 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-18 20:25:48,158 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:48,158 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:48,159 INFO L82 PathProgramCache]: Analyzing trace with hash -1860436335, now seen corresponding path program 5 times [2020-08-18 20:25:48,159 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:48,159 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [340674870] [2020-08-18 20:25:48,159 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:48,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:48,330 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:48,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:48,334 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:25:48,334 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [340674870] [2020-08-18 20:25:48,334 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:48,335 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-18 20:25:48,335 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1459267668] [2020-08-18 20:25:48,335 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-18 20:25:48,336 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:48,336 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-18 20:25:48,336 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-08-18 20:25:48,336 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 8 states. [2020-08-18 20:25:48,380 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:48,380 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2020-08-18 20:25:48,381 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-18 20:25:48,381 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 15 [2020-08-18 20:25:48,381 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:48,382 INFO L225 Difference]: With dead ends: 22 [2020-08-18 20:25:48,382 INFO L226 Difference]: Without dead ends: 17 [2020-08-18 20:25:48,383 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-08-18 20:25:48,383 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-18 20:25:48,386 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-18 20:25:48,387 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-18 20:25:48,387 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-08-18 20:25:48,388 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 15 [2020-08-18 20:25:48,388 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:48,388 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-08-18 20:25:48,388 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-18 20:25:48,388 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-08-18 20:25:48,389 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-18 20:25:48,389 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:48,389 INFO L422 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:48,389 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-18 20:25:48,390 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:48,390 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:48,390 INFO L82 PathProgramCache]: Analyzing trace with hash -1802490274, now seen corresponding path program 6 times [2020-08-18 20:25:48,390 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:48,391 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [726572994] [2020-08-18 20:25:48,391 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:48,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:48,571 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:48,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:48,574 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:25:48,575 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [726572994] [2020-08-18 20:25:48,575 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:48,575 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-18 20:25:48,575 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1173464649] [2020-08-18 20:25:48,576 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-18 20:25:48,576 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:48,576 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-18 20:25:48,577 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-18 20:25:48,577 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 9 states. [2020-08-18 20:25:48,631 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:48,631 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2020-08-18 20:25:48,631 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-18 20:25:48,632 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 16 [2020-08-18 20:25:48,632 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:48,633 INFO L225 Difference]: With dead ends: 23 [2020-08-18 20:25:48,633 INFO L226 Difference]: Without dead ends: 18 [2020-08-18 20:25:48,633 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-18 20:25:48,634 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-08-18 20:25:48,637 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-08-18 20:25:48,638 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-18 20:25:48,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2020-08-18 20:25:48,639 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 16 [2020-08-18 20:25:48,639 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:48,639 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2020-08-18 20:25:48,639 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-18 20:25:48,639 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2020-08-18 20:25:48,640 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-18 20:25:48,640 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:48,640 INFO L422 BasicCegarLoop]: trace histogram [7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:48,640 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-18 20:25:48,641 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:48,641 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:48,641 INFO L82 PathProgramCache]: Analyzing trace with hash -6162383, now seen corresponding path program 7 times [2020-08-18 20:25:48,641 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:48,642 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [969948284] [2020-08-18 20:25:48,642 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:48,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:48,852 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:48,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:48,858 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:25:48,859 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [969948284] [2020-08-18 20:25:48,859 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:48,859 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-18 20:25:48,860 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1570691498] [2020-08-18 20:25:48,860 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-18 20:25:48,861 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:48,861 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-18 20:25:48,861 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2020-08-18 20:25:48,861 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 10 states. [2020-08-18 20:25:48,921 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:48,923 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2020-08-18 20:25:48,924 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-18 20:25:48,924 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 17 [2020-08-18 20:25:48,925 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:48,925 INFO L225 Difference]: With dead ends: 24 [2020-08-18 20:25:48,925 INFO L226 Difference]: Without dead ends: 19 [2020-08-18 20:25:48,926 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2020-08-18 20:25:48,926 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-08-18 20:25:48,933 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-08-18 20:25:48,933 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-08-18 20:25:48,934 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2020-08-18 20:25:48,935 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 17 [2020-08-18 20:25:48,936 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:48,936 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2020-08-18 20:25:48,936 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-18 20:25:48,936 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2020-08-18 20:25:48,938 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-18 20:25:48,938 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:48,938 INFO L422 BasicCegarLoop]: trace histogram [8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:48,938 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-18 20:25:48,939 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:48,939 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:48,939 INFO L82 PathProgramCache]: Analyzing trace with hash -154572610, now seen corresponding path program 8 times [2020-08-18 20:25:48,939 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:48,940 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2091874954] [2020-08-18 20:25:48,940 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:48,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:49,153 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:49,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:49,157 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:25:49,158 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2091874954] [2020-08-18 20:25:49,158 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:49,158 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-18 20:25:49,159 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1876337190] [2020-08-18 20:25:49,159 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-18 20:25:49,159 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:49,160 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-18 20:25:49,161 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-08-18 20:25:49,161 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 11 states. [2020-08-18 20:25:49,245 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:49,245 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2020-08-18 20:25:49,247 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-18 20:25:49,247 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 18 [2020-08-18 20:25:49,247 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:49,248 INFO L225 Difference]: With dead ends: 25 [2020-08-18 20:25:49,248 INFO L226 Difference]: Without dead ends: 20 [2020-08-18 20:25:49,249 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-08-18 20:25:49,250 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-18 20:25:49,256 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-18 20:25:49,258 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-18 20:25:49,259 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2020-08-18 20:25:49,264 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 18 [2020-08-18 20:25:49,265 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:49,265 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2020-08-18 20:25:49,265 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-18 20:25:49,265 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2020-08-18 20:25:49,266 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-18 20:25:49,266 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:49,266 INFO L422 BasicCegarLoop]: trace histogram [9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:49,267 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-18 20:25:49,267 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:49,267 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:49,268 INFO L82 PathProgramCache]: Analyzing trace with hash -460322351, now seen corresponding path program 9 times [2020-08-18 20:25:49,268 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:49,268 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [243242081] [2020-08-18 20:25:49,269 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:49,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:49,465 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:49,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:49,469 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:25:49,470 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [243242081] [2020-08-18 20:25:49,470 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:49,470 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-18 20:25:49,471 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1905051255] [2020-08-18 20:25:49,471 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-18 20:25:49,471 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:49,472 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-18 20:25:49,472 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-08-18 20:25:49,472 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 12 states. [2020-08-18 20:25:49,561 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:49,561 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2020-08-18 20:25:49,562 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-18 20:25:49,562 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 19 [2020-08-18 20:25:49,562 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:49,563 INFO L225 Difference]: With dead ends: 26 [2020-08-18 20:25:49,563 INFO L226 Difference]: Without dead ends: 21 [2020-08-18 20:25:49,564 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-08-18 20:25:49,564 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-18 20:25:49,567 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-08-18 20:25:49,568 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-18 20:25:49,568 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2020-08-18 20:25:49,569 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 19 [2020-08-18 20:25:49,569 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:49,569 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2020-08-18 20:25:49,569 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-18 20:25:49,569 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2020-08-18 20:25:49,570 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-18 20:25:49,570 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:49,570 INFO L422 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:49,570 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-18 20:25:49,571 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:49,571 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:49,571 INFO L82 PathProgramCache]: Analyzing trace with hash -1348629730, now seen corresponding path program 10 times [2020-08-18 20:25:49,572 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:49,572 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [533914920] [2020-08-18 20:25:49,572 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:49,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:49,780 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:49,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:49,783 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:25:49,783 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [533914920] [2020-08-18 20:25:49,784 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:49,784 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-18 20:25:49,784 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [803681274] [2020-08-18 20:25:49,784 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-18 20:25:49,785 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:49,785 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-18 20:25:49,785 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2020-08-18 20:25:49,785 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 13 states. [2020-08-18 20:25:49,878 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:49,878 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2020-08-18 20:25:49,879 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-18 20:25:49,879 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 20 [2020-08-18 20:25:49,879 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:49,880 INFO L225 Difference]: With dead ends: 27 [2020-08-18 20:25:49,880 INFO L226 Difference]: Without dead ends: 22 [2020-08-18 20:25:49,881 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2020-08-18 20:25:49,881 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-18 20:25:49,885 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2020-08-18 20:25:49,885 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-08-18 20:25:49,886 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2020-08-18 20:25:49,886 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 20 [2020-08-18 20:25:49,886 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:49,886 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2020-08-18 20:25:49,886 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-18 20:25:49,887 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2020-08-18 20:25:49,887 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-08-18 20:25:49,887 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:49,887 INFO L422 BasicCegarLoop]: trace histogram [11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:49,888 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-18 20:25:49,888 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:49,888 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:49,888 INFO L82 PathProgramCache]: Analyzing trace with hash 1178612593, now seen corresponding path program 11 times [2020-08-18 20:25:49,888 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:49,889 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1764478296] [2020-08-18 20:25:49,889 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:49,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:50,075 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:50,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:50,078 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:25:50,079 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1764478296] [2020-08-18 20:25:50,079 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:50,079 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-18 20:25:50,079 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1036283357] [2020-08-18 20:25:50,080 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-18 20:25:50,080 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:50,080 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-18 20:25:50,080 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2020-08-18 20:25:50,081 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 14 states. [2020-08-18 20:25:50,185 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:50,185 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2020-08-18 20:25:50,186 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-18 20:25:50,186 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 21 [2020-08-18 20:25:50,186 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:50,187 INFO L225 Difference]: With dead ends: 28 [2020-08-18 20:25:50,187 INFO L226 Difference]: Without dead ends: 23 [2020-08-18 20:25:50,187 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2020-08-18 20:25:50,188 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-18 20:25:50,191 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-08-18 20:25:50,192 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-18 20:25:50,192 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2020-08-18 20:25:50,193 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 21 [2020-08-18 20:25:50,193 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:50,193 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2020-08-18 20:25:50,193 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-18 20:25:50,193 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2020-08-18 20:25:50,194 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-18 20:25:50,194 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:50,194 INFO L422 BasicCegarLoop]: trace histogram [12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:50,194 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-18 20:25:50,194 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:50,195 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:50,195 INFO L82 PathProgramCache]: Analyzing trace with hash -2081254018, now seen corresponding path program 12 times [2020-08-18 20:25:50,195 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:50,195 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1952930625] [2020-08-18 20:25:50,195 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:50,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:50,430 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:50,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:50,433 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:25:50,434 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1952930625] [2020-08-18 20:25:50,434 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:50,434 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-18 20:25:50,434 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [147113052] [2020-08-18 20:25:50,435 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-18 20:25:50,435 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:50,435 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-18 20:25:50,436 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2020-08-18 20:25:50,436 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 15 states. [2020-08-18 20:25:50,552 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:50,553 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2020-08-18 20:25:50,553 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-18 20:25:50,553 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 22 [2020-08-18 20:25:50,553 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:50,554 INFO L225 Difference]: With dead ends: 29 [2020-08-18 20:25:50,554 INFO L226 Difference]: Without dead ends: 24 [2020-08-18 20:25:50,554 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2020-08-18 20:25:50,555 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-18 20:25:50,558 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-08-18 20:25:50,558 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-18 20:25:50,559 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2020-08-18 20:25:50,559 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 22 [2020-08-18 20:25:50,560 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:50,560 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2020-08-18 20:25:50,560 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-18 20:25:50,560 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2020-08-18 20:25:50,561 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-08-18 20:25:50,561 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:50,561 INFO L422 BasicCegarLoop]: trace histogram [13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:50,561 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-18 20:25:50,561 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:50,561 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:50,562 INFO L82 PathProgramCache]: Analyzing trace with hash -57903855, now seen corresponding path program 13 times [2020-08-18 20:25:50,562 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:50,562 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1992693907] [2020-08-18 20:25:50,562 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:50,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:50,778 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:50,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:50,781 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:25:50,782 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1992693907] [2020-08-18 20:25:50,782 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:50,782 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-18 20:25:50,782 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [269719221] [2020-08-18 20:25:50,783 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-18 20:25:50,783 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:50,783 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-18 20:25:50,784 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2020-08-18 20:25:50,784 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 16 states. [2020-08-18 20:25:50,913 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:50,913 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2020-08-18 20:25:50,914 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-18 20:25:50,914 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 23 [2020-08-18 20:25:50,914 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:50,915 INFO L225 Difference]: With dead ends: 30 [2020-08-18 20:25:50,915 INFO L226 Difference]: Without dead ends: 25 [2020-08-18 20:25:50,916 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2020-08-18 20:25:50,917 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-18 20:25:50,920 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-08-18 20:25:50,920 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-18 20:25:50,921 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2020-08-18 20:25:50,921 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 23 [2020-08-18 20:25:50,921 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:50,921 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2020-08-18 20:25:50,921 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-18 20:25:50,922 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2020-08-18 20:25:50,922 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-18 20:25:50,922 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:50,922 INFO L422 BasicCegarLoop]: trace histogram [14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:50,923 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-18 20:25:50,923 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:50,923 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:50,923 INFO L82 PathProgramCache]: Analyzing trace with hash -1758558242, now seen corresponding path program 14 times [2020-08-18 20:25:50,923 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:50,924 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [183857880] [2020-08-18 20:25:50,924 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:50,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:51,202 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:51,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:51,206 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:25:51,207 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [183857880] [2020-08-18 20:25:51,207 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:51,207 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-18 20:25:51,207 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [837913999] [2020-08-18 20:25:51,208 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-18 20:25:51,208 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:51,208 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-18 20:25:51,209 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2020-08-18 20:25:51,209 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 17 states. [2020-08-18 20:25:51,365 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:51,365 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2020-08-18 20:25:51,366 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-18 20:25:51,366 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 24 [2020-08-18 20:25:51,367 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:51,367 INFO L225 Difference]: With dead ends: 31 [2020-08-18 20:25:51,367 INFO L226 Difference]: Without dead ends: 26 [2020-08-18 20:25:51,372 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2020-08-18 20:25:51,373 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-18 20:25:51,379 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-08-18 20:25:51,379 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-18 20:25:51,380 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2020-08-18 20:25:51,380 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 24 [2020-08-18 20:25:51,380 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:51,380 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2020-08-18 20:25:51,381 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-18 20:25:51,381 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2020-08-18 20:25:51,381 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-18 20:25:51,381 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:51,385 INFO L422 BasicCegarLoop]: trace histogram [15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:51,385 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-18 20:25:51,385 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:51,386 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:51,386 INFO L82 PathProgramCache]: Analyzing trace with hash 1355730609, now seen corresponding path program 15 times [2020-08-18 20:25:51,386 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:51,386 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [255723475] [2020-08-18 20:25:51,386 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:51,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:51,720 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:51,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:51,725 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:25:51,725 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [255723475] [2020-08-18 20:25:51,725 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:51,725 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-18 20:25:51,728 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1188868885] [2020-08-18 20:25:51,728 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-18 20:25:51,728 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:51,729 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-18 20:25:51,729 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2020-08-18 20:25:51,729 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 18 states. [2020-08-18 20:25:51,892 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:51,892 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2020-08-18 20:25:51,893 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-18 20:25:51,893 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 25 [2020-08-18 20:25:51,893 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:51,894 INFO L225 Difference]: With dead ends: 32 [2020-08-18 20:25:51,894 INFO L226 Difference]: Without dead ends: 27 [2020-08-18 20:25:51,894 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2020-08-18 20:25:51,895 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-08-18 20:25:51,898 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-08-18 20:25:51,898 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-18 20:25:51,899 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2020-08-18 20:25:51,899 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 25 [2020-08-18 20:25:51,899 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:51,899 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2020-08-18 20:25:51,899 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-18 20:25:51,900 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2020-08-18 20:25:51,900 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-18 20:25:51,900 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:51,900 INFO L422 BasicCegarLoop]: trace histogram [16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:51,901 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-18 20:25:51,901 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:51,901 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:51,901 INFO L82 PathProgramCache]: Analyzing trace with hash -885562818, now seen corresponding path program 16 times [2020-08-18 20:25:51,901 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:51,902 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [91185445] [2020-08-18 20:25:51,902 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:51,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:52,226 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:52,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:52,230 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:25:52,230 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [91185445] [2020-08-18 20:25:52,231 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:52,231 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-18 20:25:52,231 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2014229203] [2020-08-18 20:25:52,232 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-18 20:25:52,232 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:52,232 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-18 20:25:52,232 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2020-08-18 20:25:52,233 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 19 states. [2020-08-18 20:25:52,447 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:52,447 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2020-08-18 20:25:52,448 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-18 20:25:52,449 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 26 [2020-08-18 20:25:52,449 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:52,449 INFO L225 Difference]: With dead ends: 33 [2020-08-18 20:25:52,449 INFO L226 Difference]: Without dead ends: 28 [2020-08-18 20:25:52,450 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2020-08-18 20:25:52,450 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-18 20:25:52,454 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-08-18 20:25:52,454 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-18 20:25:52,455 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2020-08-18 20:25:52,455 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 26 [2020-08-18 20:25:52,455 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:52,455 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2020-08-18 20:25:52,455 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-18 20:25:52,456 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2020-08-18 20:25:52,456 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-18 20:25:52,457 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:52,457 INFO L422 BasicCegarLoop]: trace histogram [17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:52,457 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-18 20:25:52,457 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:52,457 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:52,457 INFO L82 PathProgramCache]: Analyzing trace with hash -1646182319, now seen corresponding path program 17 times [2020-08-18 20:25:52,458 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:52,458 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1692644937] [2020-08-18 20:25:52,458 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:52,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:52,820 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:52,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:52,824 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:25:52,824 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1692644937] [2020-08-18 20:25:52,824 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:52,825 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-18 20:25:52,825 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [816271215] [2020-08-18 20:25:52,825 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-18 20:25:52,826 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:52,826 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-18 20:25:52,826 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2020-08-18 20:25:52,826 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 20 states. [2020-08-18 20:25:53,066 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:53,066 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2020-08-18 20:25:53,067 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-18 20:25:53,067 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 27 [2020-08-18 20:25:53,067 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:53,068 INFO L225 Difference]: With dead ends: 34 [2020-08-18 20:25:53,068 INFO L226 Difference]: Without dead ends: 29 [2020-08-18 20:25:53,069 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2020-08-18 20:25:53,070 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-18 20:25:53,074 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-08-18 20:25:53,074 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-18 20:25:53,074 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2020-08-18 20:25:53,074 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 27 [2020-08-18 20:25:53,075 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:53,075 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2020-08-18 20:25:53,075 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-18 20:25:53,075 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2020-08-18 20:25:53,076 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-18 20:25:53,076 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:53,076 INFO L422 BasicCegarLoop]: trace histogram [18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:53,076 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-18 20:25:53,076 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:53,077 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:53,077 INFO L82 PathProgramCache]: Analyzing trace with hash 544416926, now seen corresponding path program 18 times [2020-08-18 20:25:53,077 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:53,077 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1922911007] [2020-08-18 20:25:53,078 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:53,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:53,440 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:53,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:53,444 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:25:53,444 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1922911007] [2020-08-18 20:25:53,444 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:53,445 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-18 20:25:53,445 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [517349394] [2020-08-18 20:25:53,445 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-18 20:25:53,445 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:53,446 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-18 20:25:53,446 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=363, Unknown=0, NotChecked=0, Total=420 [2020-08-18 20:25:53,446 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 21 states. [2020-08-18 20:25:53,713 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:53,714 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2020-08-18 20:25:53,714 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-18 20:25:53,715 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 28 [2020-08-18 20:25:53,715 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:53,715 INFO L225 Difference]: With dead ends: 35 [2020-08-18 20:25:53,715 INFO L226 Difference]: Without dead ends: 30 [2020-08-18 20:25:53,716 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=57, Invalid=363, Unknown=0, NotChecked=0, Total=420 [2020-08-18 20:25:53,717 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-18 20:25:53,724 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-08-18 20:25:53,724 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-08-18 20:25:53,726 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2020-08-18 20:25:53,726 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 28 [2020-08-18 20:25:53,726 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:53,726 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2020-08-18 20:25:53,727 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-18 20:25:53,727 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2020-08-18 20:25:53,727 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-08-18 20:25:53,728 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:53,728 INFO L422 BasicCegarLoop]: trace histogram [19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:53,728 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-18 20:25:53,728 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:53,728 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:53,728 INFO L82 PathProgramCache]: Analyzing trace with hash -266483215, now seen corresponding path program 19 times [2020-08-18 20:25:53,729 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:53,729 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [428611534] [2020-08-18 20:25:53,729 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:53,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:54,097 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:54,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:54,101 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:25:54,102 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [428611534] [2020-08-18 20:25:54,102 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:54,102 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-18 20:25:54,102 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1086934010] [2020-08-18 20:25:54,103 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-18 20:25:54,103 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:54,104 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-18 20:25:54,104 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=402, Unknown=0, NotChecked=0, Total=462 [2020-08-18 20:25:54,104 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 22 states. [2020-08-18 20:25:54,394 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:54,395 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2020-08-18 20:25:54,395 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-18 20:25:54,396 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 29 [2020-08-18 20:25:54,396 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:54,397 INFO L225 Difference]: With dead ends: 36 [2020-08-18 20:25:54,397 INFO L226 Difference]: Without dead ends: 31 [2020-08-18 20:25:54,398 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=60, Invalid=402, Unknown=0, NotChecked=0, Total=462 [2020-08-18 20:25:54,400 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-18 20:25:54,407 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2020-08-18 20:25:54,407 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-18 20:25:54,408 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2020-08-18 20:25:54,408 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 29 [2020-08-18 20:25:54,409 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:54,409 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2020-08-18 20:25:54,409 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-18 20:25:54,409 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2020-08-18 20:25:54,410 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-18 20:25:54,410 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:54,410 INFO L422 BasicCegarLoop]: trace histogram [20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:54,410 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-18 20:25:54,410 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:54,411 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:54,411 INFO L82 PathProgramCache]: Analyzing trace with hash 365416190, now seen corresponding path program 20 times [2020-08-18 20:25:54,411 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:54,411 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1618955559] [2020-08-18 20:25:54,412 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:54,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:54,825 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:54,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:54,829 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:25:54,830 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1618955559] [2020-08-18 20:25:54,830 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:54,830 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-18 20:25:54,830 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2042645955] [2020-08-18 20:25:54,832 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-18 20:25:54,832 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:54,832 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-18 20:25:54,833 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2020-08-18 20:25:54,833 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 23 states. [2020-08-18 20:25:55,117 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:55,117 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2020-08-18 20:25:55,118 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-18 20:25:55,118 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 30 [2020-08-18 20:25:55,118 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:55,119 INFO L225 Difference]: With dead ends: 37 [2020-08-18 20:25:55,119 INFO L226 Difference]: Without dead ends: 32 [2020-08-18 20:25:55,119 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2020-08-18 20:25:55,119 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-18 20:25:55,123 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2020-08-18 20:25:55,123 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-08-18 20:25:55,123 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2020-08-18 20:25:55,124 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 30 [2020-08-18 20:25:55,124 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:55,124 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2020-08-18 20:25:55,124 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-18 20:25:55,124 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2020-08-18 20:25:55,125 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-18 20:25:55,125 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:55,125 INFO L422 BasicCegarLoop]: trace histogram [21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:55,125 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-18 20:25:55,126 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:55,126 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:55,126 INFO L82 PathProgramCache]: Analyzing trace with hash -1520538735, now seen corresponding path program 21 times [2020-08-18 20:25:55,126 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:55,126 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [633250694] [2020-08-18 20:25:55,126 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:55,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:55,597 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:55,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:55,600 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:25:55,600 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [633250694] [2020-08-18 20:25:55,600 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:55,600 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-18 20:25:55,600 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1979002925] [2020-08-18 20:25:55,601 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-18 20:25:55,601 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:55,601 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-18 20:25:55,601 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=486, Unknown=0, NotChecked=0, Total=552 [2020-08-18 20:25:55,602 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 24 states. [2020-08-18 20:25:55,890 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:55,890 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2020-08-18 20:25:55,893 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-18 20:25:55,893 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 31 [2020-08-18 20:25:55,893 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:55,893 INFO L225 Difference]: With dead ends: 38 [2020-08-18 20:25:55,894 INFO L226 Difference]: Without dead ends: 33 [2020-08-18 20:25:55,894 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=66, Invalid=486, Unknown=0, NotChecked=0, Total=552 [2020-08-18 20:25:55,894 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-18 20:25:55,898 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-08-18 20:25:55,898 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-18 20:25:55,898 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2020-08-18 20:25:55,899 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 31 [2020-08-18 20:25:55,899 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:55,899 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2020-08-18 20:25:55,899 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-18 20:25:55,899 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2020-08-18 20:25:55,900 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-18 20:25:55,900 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:55,900 INFO L422 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:55,900 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-18 20:25:55,900 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:55,901 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:55,901 INFO L82 PathProgramCache]: Analyzing trace with hash 144400734, now seen corresponding path program 22 times [2020-08-18 20:25:55,901 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:55,901 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [620734646] [2020-08-18 20:25:55,901 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:55,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:56,370 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:56,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:56,373 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:25:56,373 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [620734646] [2020-08-18 20:25:56,374 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:56,374 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-18 20:25:56,374 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [408409644] [2020-08-18 20:25:56,374 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-18 20:25:56,375 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:56,375 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-18 20:25:56,375 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=531, Unknown=0, NotChecked=0, Total=600 [2020-08-18 20:25:56,375 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 25 states. [2020-08-18 20:25:56,679 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:56,679 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2020-08-18 20:25:56,680 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-18 20:25:56,680 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 32 [2020-08-18 20:25:56,680 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:56,680 INFO L225 Difference]: With dead ends: 39 [2020-08-18 20:25:56,681 INFO L226 Difference]: Without dead ends: 34 [2020-08-18 20:25:56,681 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=69, Invalid=531, Unknown=0, NotChecked=0, Total=600 [2020-08-18 20:25:56,682 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-18 20:25:56,685 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-08-18 20:25:56,685 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-18 20:25:56,686 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2020-08-18 20:25:56,686 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 32 [2020-08-18 20:25:56,686 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:56,686 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2020-08-18 20:25:56,686 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-18 20:25:56,687 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2020-08-18 20:25:56,687 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-18 20:25:56,687 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:56,687 INFO L422 BasicCegarLoop]: trace histogram [23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:56,688 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-18 20:25:56,688 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:56,688 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:56,688 INFO L82 PathProgramCache]: Analyzing trace with hash 217916721, now seen corresponding path program 23 times [2020-08-18 20:25:56,688 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:56,689 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1218364216] [2020-08-18 20:25:56,689 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:56,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:57,188 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:57,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:57,192 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:25:57,192 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1218364216] [2020-08-18 20:25:57,192 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:57,192 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-18 20:25:57,193 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [932145489] [2020-08-18 20:25:57,193 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-18 20:25:57,193 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:57,193 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-18 20:25:57,194 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=578, Unknown=0, NotChecked=0, Total=650 [2020-08-18 20:25:57,194 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand 26 states. [2020-08-18 20:25:57,580 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:57,581 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2020-08-18 20:25:57,581 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-18 20:25:57,581 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 33 [2020-08-18 20:25:57,582 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:57,582 INFO L225 Difference]: With dead ends: 40 [2020-08-18 20:25:57,582 INFO L226 Difference]: Without dead ends: 35 [2020-08-18 20:25:57,582 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=72, Invalid=578, Unknown=0, NotChecked=0, Total=650 [2020-08-18 20:25:57,583 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-18 20:25:57,586 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-08-18 20:25:57,586 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-18 20:25:57,587 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2020-08-18 20:25:57,587 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 33 [2020-08-18 20:25:57,587 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:57,587 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2020-08-18 20:25:57,587 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-18 20:25:57,588 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2020-08-18 20:25:57,588 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-18 20:25:57,588 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:57,588 INFO L422 BasicCegarLoop]: trace histogram [24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:57,589 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-18 20:25:57,589 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:57,589 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:57,589 INFO L82 PathProgramCache]: Analyzing trace with hash -1798054978, now seen corresponding path program 24 times [2020-08-18 20:25:57,589 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:57,590 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1192015907] [2020-08-18 20:25:57,590 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:57,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:58,167 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:58,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:58,170 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:25:58,171 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1192015907] [2020-08-18 20:25:58,171 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:58,171 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-18 20:25:58,171 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [269235836] [2020-08-18 20:25:58,172 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-18 20:25:58,172 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:58,172 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-18 20:25:58,173 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=627, Unknown=0, NotChecked=0, Total=702 [2020-08-18 20:25:58,173 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 27 states. [2020-08-18 20:25:58,571 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:58,571 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2020-08-18 20:25:58,572 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-18 20:25:58,572 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 34 [2020-08-18 20:25:58,573 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:58,573 INFO L225 Difference]: With dead ends: 41 [2020-08-18 20:25:58,573 INFO L226 Difference]: Without dead ends: 36 [2020-08-18 20:25:58,574 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=75, Invalid=627, Unknown=0, NotChecked=0, Total=702 [2020-08-18 20:25:58,575 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-18 20:25:58,579 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-08-18 20:25:58,579 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-18 20:25:58,579 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2020-08-18 20:25:58,580 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 34 [2020-08-18 20:25:58,580 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:58,580 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2020-08-18 20:25:58,580 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-18 20:25:58,581 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2020-08-18 20:25:58,581 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-08-18 20:25:58,581 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:58,581 INFO L422 BasicCegarLoop]: trace histogram [25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:58,582 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-18 20:25:58,582 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:58,582 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:58,582 INFO L82 PathProgramCache]: Analyzing trace with hash 131331793, now seen corresponding path program 25 times [2020-08-18 20:25:58,582 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:58,583 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1271098125] [2020-08-18 20:25:58,583 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:58,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:59,347 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:59,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:59,355 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:25:59,356 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1271098125] [2020-08-18 20:25:59,356 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:59,356 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-18 20:25:59,357 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [249435879] [2020-08-18 20:25:59,359 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-18 20:25:59,360 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:59,360 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-18 20:25:59,361 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=678, Unknown=0, NotChecked=0, Total=756 [2020-08-18 20:25:59,361 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 28 states. [2020-08-18 20:25:59,947 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:59,947 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2020-08-18 20:25:59,948 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-18 20:25:59,948 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 35 [2020-08-18 20:25:59,948 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:59,949 INFO L225 Difference]: With dead ends: 42 [2020-08-18 20:25:59,949 INFO L226 Difference]: Without dead ends: 37 [2020-08-18 20:25:59,950 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=78, Invalid=678, Unknown=0, NotChecked=0, Total=756 [2020-08-18 20:25:59,950 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-18 20:25:59,962 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-08-18 20:25:59,962 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-18 20:25:59,963 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2020-08-18 20:25:59,963 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 35 [2020-08-18 20:25:59,964 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:59,964 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2020-08-18 20:25:59,964 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-18 20:25:59,964 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2020-08-18 20:25:59,965 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-18 20:25:59,965 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:59,965 INFO L422 BasicCegarLoop]: trace histogram [26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:59,970 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-18 20:25:59,970 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:59,970 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:59,971 INFO L82 PathProgramCache]: Analyzing trace with hash -187220450, now seen corresponding path program 26 times [2020-08-18 20:25:59,971 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:59,971 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [667268136] [2020-08-18 20:25:59,971 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:00,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:00,670 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:00,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:00,674 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:26:00,674 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [667268136] [2020-08-18 20:26:00,675 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:00,675 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-18 20:26:00,675 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [905134952] [2020-08-18 20:26:00,675 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-18 20:26:00,676 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:00,676 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-18 20:26:00,676 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=731, Unknown=0, NotChecked=0, Total=812 [2020-08-18 20:26:00,677 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 29 states. [2020-08-18 20:26:01,169 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:01,170 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2020-08-18 20:26:01,170 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-18 20:26:01,170 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 36 [2020-08-18 20:26:01,171 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:01,171 INFO L225 Difference]: With dead ends: 43 [2020-08-18 20:26:01,171 INFO L226 Difference]: Without dead ends: 38 [2020-08-18 20:26:01,172 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=81, Invalid=731, Unknown=0, NotChecked=0, Total=812 [2020-08-18 20:26:01,172 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-18 20:26:01,181 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-08-18 20:26:01,181 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-18 20:26:01,181 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2020-08-18 20:26:01,181 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 36 [2020-08-18 20:26:01,182 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:01,182 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2020-08-18 20:26:01,182 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-18 20:26:01,182 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2020-08-18 20:26:01,183 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-18 20:26:01,186 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:01,186 INFO L422 BasicCegarLoop]: trace histogram [27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:01,187 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-18 20:26:01,187 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:01,187 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:01,187 INFO L82 PathProgramCache]: Analyzing trace with hash -1472405391, now seen corresponding path program 27 times [2020-08-18 20:26:01,187 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:01,187 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1146136231] [2020-08-18 20:26:01,188 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:01,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:01,838 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:01,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:01,843 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:26:01,843 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1146136231] [2020-08-18 20:26:01,843 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:01,843 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-18 20:26:01,844 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [968154809] [2020-08-18 20:26:01,844 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-18 20:26:01,844 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:01,844 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-18 20:26:01,845 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=786, Unknown=0, NotChecked=0, Total=870 [2020-08-18 20:26:01,845 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 30 states. [2020-08-18 20:26:02,314 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:02,314 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2020-08-18 20:26:02,315 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-18 20:26:02,315 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 37 [2020-08-18 20:26:02,315 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:02,316 INFO L225 Difference]: With dead ends: 44 [2020-08-18 20:26:02,316 INFO L226 Difference]: Without dead ends: 39 [2020-08-18 20:26:02,317 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=84, Invalid=786, Unknown=0, NotChecked=0, Total=870 [2020-08-18 20:26:02,317 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-18 20:26:02,321 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-08-18 20:26:02,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-18 20:26:02,322 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2020-08-18 20:26:02,322 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 37 [2020-08-18 20:26:02,322 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:02,322 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2020-08-18 20:26:02,322 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-18 20:26:02,323 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2020-08-18 20:26:02,323 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-18 20:26:02,323 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:02,324 INFO L422 BasicCegarLoop]: trace histogram [28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:02,324 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-18 20:26:02,324 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:02,324 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:02,324 INFO L82 PathProgramCache]: Analyzing trace with hash 1636534398, now seen corresponding path program 28 times [2020-08-18 20:26:02,325 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:02,325 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1720077835] [2020-08-18 20:26:02,325 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:02,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:03,013 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:03,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:03,018 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:26:03,019 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1720077835] [2020-08-18 20:26:03,019 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:03,019 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-18 20:26:03,019 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [732073565] [2020-08-18 20:26:03,020 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-18 20:26:03,020 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:03,020 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-18 20:26:03,020 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=843, Unknown=0, NotChecked=0, Total=930 [2020-08-18 20:26:03,021 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 31 states. [2020-08-18 20:26:03,527 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:03,528 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2020-08-18 20:26:03,528 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-18 20:26:03,528 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 38 [2020-08-18 20:26:03,529 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:03,529 INFO L225 Difference]: With dead ends: 45 [2020-08-18 20:26:03,529 INFO L226 Difference]: Without dead ends: 40 [2020-08-18 20:26:03,530 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=87, Invalid=843, Unknown=0, NotChecked=0, Total=930 [2020-08-18 20:26:03,531 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-18 20:26:03,534 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2020-08-18 20:26:03,534 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-18 20:26:03,534 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 40 transitions. [2020-08-18 20:26:03,534 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 40 transitions. Word has length 38 [2020-08-18 20:26:03,535 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:03,535 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 40 transitions. [2020-08-18 20:26:03,535 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-18 20:26:03,535 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 40 transitions. [2020-08-18 20:26:03,535 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-18 20:26:03,535 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:03,536 INFO L422 BasicCegarLoop]: trace histogram [29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:03,536 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-18 20:26:03,536 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:03,536 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:03,536 INFO L82 PathProgramCache]: Analyzing trace with hash -770579951, now seen corresponding path program 29 times [2020-08-18 20:26:03,537 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:03,538 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1343393070] [2020-08-18 20:26:03,538 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:03,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:04,287 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:04,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:04,292 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:26:04,292 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1343393070] [2020-08-18 20:26:04,292 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:04,292 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-18 20:26:04,293 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [703304036] [2020-08-18 20:26:04,293 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-18 20:26:04,293 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:04,293 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-18 20:26:04,294 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=902, Unknown=0, NotChecked=0, Total=992 [2020-08-18 20:26:04,294 INFO L87 Difference]: Start difference. First operand 40 states and 40 transitions. Second operand 32 states. [2020-08-18 20:26:04,877 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:04,878 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2020-08-18 20:26:04,878 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-18 20:26:04,878 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 39 [2020-08-18 20:26:04,879 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:04,879 INFO L225 Difference]: With dead ends: 46 [2020-08-18 20:26:04,879 INFO L226 Difference]: Without dead ends: 41 [2020-08-18 20:26:04,881 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=90, Invalid=902, Unknown=0, NotChecked=0, Total=992 [2020-08-18 20:26:04,881 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-18 20:26:04,884 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-08-18 20:26:04,884 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-18 20:26:04,885 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2020-08-18 20:26:04,885 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 39 [2020-08-18 20:26:04,885 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:04,885 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2020-08-18 20:26:04,885 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-18 20:26:04,886 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2020-08-18 20:26:04,886 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-18 20:26:04,886 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:04,886 INFO L422 BasicCegarLoop]: trace histogram [30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:04,886 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-18 20:26:04,887 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:04,887 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:04,887 INFO L82 PathProgramCache]: Analyzing trace with hash 1918286558, now seen corresponding path program 30 times [2020-08-18 20:26:04,887 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:04,887 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [83756454] [2020-08-18 20:26:04,887 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:04,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:05,644 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:05,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:05,649 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:26:05,649 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [83756454] [2020-08-18 20:26:05,650 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:05,650 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-18 20:26:05,650 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1546504956] [2020-08-18 20:26:05,650 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-18 20:26:05,650 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:05,651 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-18 20:26:05,651 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=963, Unknown=0, NotChecked=0, Total=1056 [2020-08-18 20:26:05,651 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 33 states. [2020-08-18 20:26:06,263 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:06,263 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2020-08-18 20:26:06,264 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-18 20:26:06,264 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 40 [2020-08-18 20:26:06,264 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:06,265 INFO L225 Difference]: With dead ends: 47 [2020-08-18 20:26:06,265 INFO L226 Difference]: Without dead ends: 42 [2020-08-18 20:26:06,265 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=93, Invalid=963, Unknown=0, NotChecked=0, Total=1056 [2020-08-18 20:26:06,266 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-18 20:26:06,268 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-08-18 20:26:06,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-18 20:26:06,269 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2020-08-18 20:26:06,269 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 40 [2020-08-18 20:26:06,269 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:06,270 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2020-08-18 20:26:06,270 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-18 20:26:06,270 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2020-08-18 20:26:06,270 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-18 20:26:06,270 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:06,270 INFO L422 BasicCegarLoop]: trace histogram [31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:06,271 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-18 20:26:06,271 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:06,271 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:06,271 INFO L82 PathProgramCache]: Analyzing trace with hash -626197583, now seen corresponding path program 31 times [2020-08-18 20:26:06,271 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:06,271 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1489799284] [2020-08-18 20:26:06,272 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:06,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:07,038 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:07,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:07,042 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:26:07,042 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1489799284] [2020-08-18 20:26:07,042 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:07,042 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-18 20:26:07,043 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [672651090] [2020-08-18 20:26:07,043 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-18 20:26:07,043 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:07,043 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-18 20:26:07,044 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=1026, Unknown=0, NotChecked=0, Total=1122 [2020-08-18 20:26:07,044 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand 34 states. [2020-08-18 20:26:07,723 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:07,723 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2020-08-18 20:26:07,724 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-18 20:26:07,724 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 41 [2020-08-18 20:26:07,724 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:07,725 INFO L225 Difference]: With dead ends: 48 [2020-08-18 20:26:07,725 INFO L226 Difference]: Without dead ends: 43 [2020-08-18 20:26:07,726 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=96, Invalid=1026, Unknown=0, NotChecked=0, Total=1122 [2020-08-18 20:26:07,727 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-18 20:26:07,730 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-08-18 20:26:07,730 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-18 20:26:07,730 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2020-08-18 20:26:07,730 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 41 [2020-08-18 20:26:07,731 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:07,731 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2020-08-18 20:26:07,731 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-18 20:26:07,731 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2020-08-18 20:26:07,731 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-18 20:26:07,731 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:07,732 INFO L422 BasicCegarLoop]: trace histogram [32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:07,732 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-18 20:26:07,732 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:07,732 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:07,732 INFO L82 PathProgramCache]: Analyzing trace with hash 2099172670, now seen corresponding path program 32 times [2020-08-18 20:26:07,732 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:07,733 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1392909196] [2020-08-18 20:26:07,733 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:07,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:08,604 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:08,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:08,608 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:26:08,609 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1392909196] [2020-08-18 20:26:08,609 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:08,609 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-18 20:26:08,609 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1181196306] [2020-08-18 20:26:08,610 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-18 20:26:08,610 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:08,610 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-18 20:26:08,611 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=1091, Unknown=0, NotChecked=0, Total=1190 [2020-08-18 20:26:08,611 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 35 states. [2020-08-18 20:26:09,338 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:09,338 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2020-08-18 20:26:09,339 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-18 20:26:09,339 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 42 [2020-08-18 20:26:09,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:09,340 INFO L225 Difference]: With dead ends: 49 [2020-08-18 20:26:09,340 INFO L226 Difference]: Without dead ends: 44 [2020-08-18 20:26:09,341 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=99, Invalid=1091, Unknown=0, NotChecked=0, Total=1190 [2020-08-18 20:26:09,342 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-18 20:26:09,344 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-08-18 20:26:09,344 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-18 20:26:09,345 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2020-08-18 20:26:09,345 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 42 [2020-08-18 20:26:09,345 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:09,345 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2020-08-18 20:26:09,345 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-18 20:26:09,345 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2020-08-18 20:26:09,346 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-18 20:26:09,346 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:09,346 INFO L422 BasicCegarLoop]: trace histogram [33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:09,346 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-18 20:26:09,346 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:09,347 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:09,347 INFO L82 PathProgramCache]: Analyzing trace with hash 686304593, now seen corresponding path program 33 times [2020-08-18 20:26:09,347 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:09,347 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [453409965] [2020-08-18 20:26:09,347 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:09,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:10,278 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:10,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:10,283 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:26:10,284 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [453409965] [2020-08-18 20:26:10,284 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:10,284 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-18 20:26:10,284 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1900930499] [2020-08-18 20:26:10,285 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-18 20:26:10,286 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:10,286 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-18 20:26:10,291 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=1158, Unknown=0, NotChecked=0, Total=1260 [2020-08-18 20:26:10,291 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 36 states. [2020-08-18 20:26:11,036 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:11,036 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2020-08-18 20:26:11,037 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-18 20:26:11,037 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 43 [2020-08-18 20:26:11,037 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:11,038 INFO L225 Difference]: With dead ends: 50 [2020-08-18 20:26:11,038 INFO L226 Difference]: Without dead ends: 45 [2020-08-18 20:26:11,039 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=102, Invalid=1158, Unknown=0, NotChecked=0, Total=1260 [2020-08-18 20:26:11,039 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-08-18 20:26:11,041 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2020-08-18 20:26:11,041 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-18 20:26:11,042 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2020-08-18 20:26:11,042 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 43 [2020-08-18 20:26:11,042 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:11,042 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2020-08-18 20:26:11,042 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-18 20:26:11,042 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2020-08-18 20:26:11,043 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-18 20:26:11,043 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:11,043 INFO L422 BasicCegarLoop]: trace histogram [34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:11,043 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-18 20:26:11,043 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:11,044 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:11,044 INFO L82 PathProgramCache]: Analyzing trace with hash -162932834, now seen corresponding path program 34 times [2020-08-18 20:26:11,044 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:11,044 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1234898908] [2020-08-18 20:26:11,044 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:11,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:12,010 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:12,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:12,016 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:26:12,016 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1234898908] [2020-08-18 20:26:12,016 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:12,016 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-18 20:26:12,017 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1926116225] [2020-08-18 20:26:12,017 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-18 20:26:12,017 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:12,017 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-18 20:26:12,018 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=1227, Unknown=0, NotChecked=0, Total=1332 [2020-08-18 20:26:12,018 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 37 states. [2020-08-18 20:26:12,835 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:12,835 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2020-08-18 20:26:12,836 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-18 20:26:12,836 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 44 [2020-08-18 20:26:12,836 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:12,837 INFO L225 Difference]: With dead ends: 51 [2020-08-18 20:26:12,837 INFO L226 Difference]: Without dead ends: 46 [2020-08-18 20:26:12,838 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=105, Invalid=1227, Unknown=0, NotChecked=0, Total=1332 [2020-08-18 20:26:12,838 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-18 20:26:12,840 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2020-08-18 20:26:12,841 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-18 20:26:12,841 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 46 transitions. [2020-08-18 20:26:12,841 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 46 transitions. Word has length 44 [2020-08-18 20:26:12,842 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:12,842 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 46 transitions. [2020-08-18 20:26:12,842 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-18 20:26:12,842 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 46 transitions. [2020-08-18 20:26:12,842 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-08-18 20:26:12,842 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:12,842 INFO L422 BasicCegarLoop]: trace histogram [35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:12,843 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-18 20:26:12,843 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:12,843 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:12,843 INFO L82 PathProgramCache]: Analyzing trace with hash -719489295, now seen corresponding path program 35 times [2020-08-18 20:26:12,843 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:12,844 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [600184933] [2020-08-18 20:26:12,844 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:12,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:13,895 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:13,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:13,900 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:26:13,900 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [600184933] [2020-08-18 20:26:13,900 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:13,900 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-18 20:26:13,900 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [675669726] [2020-08-18 20:26:13,901 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-18 20:26:13,901 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:13,901 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-18 20:26:13,902 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=1298, Unknown=0, NotChecked=0, Total=1406 [2020-08-18 20:26:13,902 INFO L87 Difference]: Start difference. First operand 46 states and 46 transitions. Second operand 38 states. [2020-08-18 20:26:14,743 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:14,743 INFO L93 Difference]: Finished difference Result 52 states and 52 transitions. [2020-08-18 20:26:14,744 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-18 20:26:14,745 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 45 [2020-08-18 20:26:14,745 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:14,745 INFO L225 Difference]: With dead ends: 52 [2020-08-18 20:26:14,746 INFO L226 Difference]: Without dead ends: 47 [2020-08-18 20:26:14,747 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=108, Invalid=1298, Unknown=0, NotChecked=0, Total=1406 [2020-08-18 20:26:14,747 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-18 20:26:14,749 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2020-08-18 20:26:14,749 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-18 20:26:14,750 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2020-08-18 20:26:14,750 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 45 [2020-08-18 20:26:14,750 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:14,750 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2020-08-18 20:26:14,750 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-18 20:26:14,751 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2020-08-18 20:26:14,751 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-18 20:26:14,751 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:14,751 INFO L422 BasicCegarLoop]: trace histogram [36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:14,751 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-18 20:26:14,752 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:14,752 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:14,752 INFO L82 PathProgramCache]: Analyzing trace with hash -792870402, now seen corresponding path program 36 times [2020-08-18 20:26:14,752 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:14,752 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [343885344] [2020-08-18 20:26:14,753 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:14,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:15,830 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:15,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:15,835 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:26:15,835 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [343885344] [2020-08-18 20:26:15,835 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:15,836 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-18 20:26:15,836 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1846115444] [2020-08-18 20:26:15,836 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-18 20:26:15,836 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:15,836 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-18 20:26:15,837 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=1371, Unknown=0, NotChecked=0, Total=1482 [2020-08-18 20:26:15,837 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 39 states. [2020-08-18 20:26:16,755 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:16,756 INFO L93 Difference]: Finished difference Result 53 states and 53 transitions. [2020-08-18 20:26:16,757 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-18 20:26:16,757 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 46 [2020-08-18 20:26:16,757 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:16,757 INFO L225 Difference]: With dead ends: 53 [2020-08-18 20:26:16,757 INFO L226 Difference]: Without dead ends: 48 [2020-08-18 20:26:16,758 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=111, Invalid=1371, Unknown=0, NotChecked=0, Total=1482 [2020-08-18 20:26:16,759 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-18 20:26:16,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-08-18 20:26:16,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-18 20:26:16,762 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 48 transitions. [2020-08-18 20:26:16,763 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 48 transitions. Word has length 46 [2020-08-18 20:26:16,763 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:16,763 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 48 transitions. [2020-08-18 20:26:16,763 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-18 20:26:16,763 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 48 transitions. [2020-08-18 20:26:16,764 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-08-18 20:26:16,764 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:16,764 INFO L422 BasicCegarLoop]: trace histogram [37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:16,764 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-18 20:26:16,764 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:16,764 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:16,765 INFO L82 PathProgramCache]: Analyzing trace with hash 1227282577, now seen corresponding path program 37 times [2020-08-18 20:26:16,765 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:16,765 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [315422015] [2020-08-18 20:26:16,765 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:16,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:17,877 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:17,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:17,883 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:26:17,883 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [315422015] [2020-08-18 20:26:17,884 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:17,884 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-18 20:26:17,884 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [20620417] [2020-08-18 20:26:17,884 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-18 20:26:17,884 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:17,885 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-18 20:26:17,885 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=1446, Unknown=0, NotChecked=0, Total=1560 [2020-08-18 20:26:17,885 INFO L87 Difference]: Start difference. First operand 48 states and 48 transitions. Second operand 40 states. [2020-08-18 20:26:18,836 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:18,836 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2020-08-18 20:26:18,837 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-18 20:26:18,837 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 47 [2020-08-18 20:26:18,837 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:18,838 INFO L225 Difference]: With dead ends: 54 [2020-08-18 20:26:18,838 INFO L226 Difference]: Without dead ends: 49 [2020-08-18 20:26:18,839 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=114, Invalid=1446, Unknown=0, NotChecked=0, Total=1560 [2020-08-18 20:26:18,839 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-18 20:26:18,842 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-18 20:26:18,842 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-18 20:26:18,842 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2020-08-18 20:26:18,842 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 47 [2020-08-18 20:26:18,842 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:18,843 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2020-08-18 20:26:18,843 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-18 20:26:18,843 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2020-08-18 20:26:18,843 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-18 20:26:18,843 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:18,843 INFO L422 BasicCegarLoop]: trace histogram [38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:18,843 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-18 20:26:18,844 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:18,844 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:18,844 INFO L82 PathProgramCache]: Analyzing trace with hash -572484514, now seen corresponding path program 38 times [2020-08-18 20:26:18,844 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:18,844 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1495499811] [2020-08-18 20:26:18,844 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:18,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:20,022 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:20,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:20,029 INFO L134 CoverageAnalysis]: Checked inductivity of 741 backedges. 0 proven. 741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:26:20,030 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1495499811] [2020-08-18 20:26:20,030 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:20,030 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-18 20:26:20,030 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1448175411] [2020-08-18 20:26:20,031 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-18 20:26:20,031 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:20,031 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-18 20:26:20,032 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=1523, Unknown=0, NotChecked=0, Total=1640 [2020-08-18 20:26:20,032 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand 41 states. [2020-08-18 20:26:21,013 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:21,013 INFO L93 Difference]: Finished difference Result 55 states and 55 transitions. [2020-08-18 20:26:21,014 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-18 20:26:21,014 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 48 [2020-08-18 20:26:21,014 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:21,015 INFO L225 Difference]: With dead ends: 55 [2020-08-18 20:26:21,015 INFO L226 Difference]: Without dead ends: 50 [2020-08-18 20:26:21,016 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=117, Invalid=1523, Unknown=0, NotChecked=0, Total=1640 [2020-08-18 20:26:21,016 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-08-18 20:26:21,019 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2020-08-18 20:26:21,019 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-08-18 20:26:21,019 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 50 transitions. [2020-08-18 20:26:21,019 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 50 transitions. Word has length 48 [2020-08-18 20:26:21,020 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:21,020 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 50 transitions. [2020-08-18 20:26:21,020 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-18 20:26:21,020 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 50 transitions. [2020-08-18 20:26:21,020 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-08-18 20:26:21,021 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:21,021 INFO L422 BasicCegarLoop]: trace histogram [39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:21,021 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-18 20:26:21,021 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:21,021 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:21,021 INFO L82 PathProgramCache]: Analyzing trace with hash -530689487, now seen corresponding path program 39 times [2020-08-18 20:26:21,022 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:21,022 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [151163957] [2020-08-18 20:26:21,022 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:21,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:22,234 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:22,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:22,238 INFO L134 CoverageAnalysis]: Checked inductivity of 780 backedges. 0 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:26:22,239 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [151163957] [2020-08-18 20:26:22,239 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:22,239 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-18 20:26:22,239 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1765713041] [2020-08-18 20:26:22,239 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-18 20:26:22,239 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:22,240 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-18 20:26:22,240 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=1602, Unknown=0, NotChecked=0, Total=1722 [2020-08-18 20:26:22,240 INFO L87 Difference]: Start difference. First operand 50 states and 50 transitions. Second operand 42 states. [2020-08-18 20:26:23,272 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:23,273 INFO L93 Difference]: Finished difference Result 56 states and 56 transitions. [2020-08-18 20:26:23,273 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-18 20:26:23,273 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 49 [2020-08-18 20:26:23,274 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:23,274 INFO L225 Difference]: With dead ends: 56 [2020-08-18 20:26:23,274 INFO L226 Difference]: Without dead ends: 51 [2020-08-18 20:26:23,275 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=120, Invalid=1602, Unknown=0, NotChecked=0, Total=1722 [2020-08-18 20:26:23,275 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-08-18 20:26:23,277 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2020-08-18 20:26:23,277 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-18 20:26:23,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2020-08-18 20:26:23,278 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 49 [2020-08-18 20:26:23,278 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:23,278 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2020-08-18 20:26:23,278 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-18 20:26:23,278 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2020-08-18 20:26:23,279 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-18 20:26:23,279 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:23,279 INFO L422 BasicCegarLoop]: trace histogram [40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:23,279 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-18 20:26:23,279 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:23,280 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:23,280 INFO L82 PathProgramCache]: Analyzing trace with hash 764956350, now seen corresponding path program 40 times [2020-08-18 20:26:23,280 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:23,280 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2071708229] [2020-08-18 20:26:23,280 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:23,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:24,597 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:24,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:24,603 INFO L134 CoverageAnalysis]: Checked inductivity of 820 backedges. 0 proven. 820 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:26:24,603 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2071708229] [2020-08-18 20:26:24,603 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:24,604 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-18 20:26:24,604 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [75669179] [2020-08-18 20:26:24,604 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-18 20:26:24,604 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:24,605 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-18 20:26:24,605 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=1683, Unknown=0, NotChecked=0, Total=1806 [2020-08-18 20:26:24,605 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 43 states. [2020-08-18 20:26:25,752 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:25,753 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2020-08-18 20:26:25,753 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-08-18 20:26:25,753 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 50 [2020-08-18 20:26:25,754 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:25,754 INFO L225 Difference]: With dead ends: 57 [2020-08-18 20:26:25,754 INFO L226 Difference]: Without dead ends: 52 [2020-08-18 20:26:25,755 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=123, Invalid=1683, Unknown=0, NotChecked=0, Total=1806 [2020-08-18 20:26:25,755 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-18 20:26:25,758 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2020-08-18 20:26:25,758 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-08-18 20:26:25,759 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 52 transitions. [2020-08-18 20:26:25,759 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 52 transitions. Word has length 50 [2020-08-18 20:26:25,759 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:25,759 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 52 transitions. [2020-08-18 20:26:25,759 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-18 20:26:25,759 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 52 transitions. [2020-08-18 20:26:25,759 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-08-18 20:26:25,760 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:25,760 INFO L422 BasicCegarLoop]: trace histogram [41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:25,760 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-18 20:26:25,760 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:25,760 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:25,761 INFO L82 PathProgramCache]: Analyzing trace with hash -2019695663, now seen corresponding path program 41 times [2020-08-18 20:26:25,761 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:25,761 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [526820521] [2020-08-18 20:26:25,761 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:25,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:27,108 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:27,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:27,114 INFO L134 CoverageAnalysis]: Checked inductivity of 861 backedges. 0 proven. 861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:26:27,115 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [526820521] [2020-08-18 20:26:27,115 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:27,115 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44] total 44 [2020-08-18 20:26:27,115 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [593588019] [2020-08-18 20:26:27,115 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-08-18 20:26:27,116 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:27,116 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-08-18 20:26:27,116 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=1766, Unknown=0, NotChecked=0, Total=1892 [2020-08-18 20:26:27,116 INFO L87 Difference]: Start difference. First operand 52 states and 52 transitions. Second operand 44 states. [2020-08-18 20:26:28,307 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:28,308 INFO L93 Difference]: Finished difference Result 58 states and 58 transitions. [2020-08-18 20:26:28,308 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-08-18 20:26:28,308 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 51 [2020-08-18 20:26:28,309 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:28,309 INFO L225 Difference]: With dead ends: 58 [2020-08-18 20:26:28,309 INFO L226 Difference]: Without dead ends: 53 [2020-08-18 20:26:28,310 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=126, Invalid=1766, Unknown=0, NotChecked=0, Total=1892 [2020-08-18 20:26:28,310 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-08-18 20:26:28,313 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2020-08-18 20:26:28,313 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-18 20:26:28,314 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2020-08-18 20:26:28,314 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 51 [2020-08-18 20:26:28,314 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:28,314 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2020-08-18 20:26:28,314 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-08-18 20:26:28,314 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2020-08-18 20:26:28,315 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-18 20:26:28,315 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:28,315 INFO L422 BasicCegarLoop]: trace histogram [42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:28,315 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-08-18 20:26:28,315 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:28,316 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:28,316 INFO L82 PathProgramCache]: Analyzing trace with hash 1850405150, now seen corresponding path program 42 times [2020-08-18 20:26:28,317 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:28,317 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1418424458] [2020-08-18 20:26:28,317 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:28,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:29,761 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:29,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:29,767 INFO L134 CoverageAnalysis]: Checked inductivity of 903 backedges. 0 proven. 903 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:26:29,767 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1418424458] [2020-08-18 20:26:29,767 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:29,768 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45] total 45 [2020-08-18 20:26:29,768 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [821886117] [2020-08-18 20:26:29,768 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2020-08-18 20:26:29,768 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:29,769 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2020-08-18 20:26:29,769 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=1851, Unknown=0, NotChecked=0, Total=1980 [2020-08-18 20:26:29,769 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 45 states. [2020-08-18 20:26:31,029 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:31,029 INFO L93 Difference]: Finished difference Result 59 states and 59 transitions. [2020-08-18 20:26:31,031 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2020-08-18 20:26:31,031 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 52 [2020-08-18 20:26:31,031 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:31,032 INFO L225 Difference]: With dead ends: 59 [2020-08-18 20:26:31,032 INFO L226 Difference]: Without dead ends: 54 [2020-08-18 20:26:31,033 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=129, Invalid=1851, Unknown=0, NotChecked=0, Total=1980 [2020-08-18 20:26:31,033 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-18 20:26:31,036 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2020-08-18 20:26:31,036 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-08-18 20:26:31,036 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 54 transitions. [2020-08-18 20:26:31,037 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 54 transitions. Word has length 52 [2020-08-18 20:26:31,037 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:31,037 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 54 transitions. [2020-08-18 20:26:31,037 INFO L480 AbstractCegarLoop]: Interpolant automaton has 45 states. [2020-08-18 20:26:31,037 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 54 transitions. [2020-08-18 20:26:31,038 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-08-18 20:26:31,038 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:31,038 INFO L422 BasicCegarLoop]: trace histogram [43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:31,038 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2020-08-18 20:26:31,038 INFO L427 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:31,038 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:31,039 INFO L82 PathProgramCache]: Analyzing trace with hash 1564446065, now seen corresponding path program 43 times [2020-08-18 20:26:31,039 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:31,039 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [444666506] [2020-08-18 20:26:31,039 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:31,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:32,530 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:32,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:32,536 INFO L134 CoverageAnalysis]: Checked inductivity of 946 backedges. 0 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:26:32,536 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [444666506] [2020-08-18 20:26:32,536 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:32,536 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46] total 46 [2020-08-18 20:26:32,536 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [318920570] [2020-08-18 20:26:32,537 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2020-08-18 20:26:32,537 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:32,537 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2020-08-18 20:26:32,537 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=1938, Unknown=0, NotChecked=0, Total=2070 [2020-08-18 20:26:32,537 INFO L87 Difference]: Start difference. First operand 54 states and 54 transitions. Second operand 46 states. [2020-08-18 20:26:33,833 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:33,834 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2020-08-18 20:26:33,834 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2020-08-18 20:26:33,834 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 53 [2020-08-18 20:26:33,835 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:33,835 INFO L225 Difference]: With dead ends: 60 [2020-08-18 20:26:33,835 INFO L226 Difference]: Without dead ends: 55 [2020-08-18 20:26:33,836 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=132, Invalid=1938, Unknown=0, NotChecked=0, Total=2070 [2020-08-18 20:26:33,836 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-08-18 20:26:33,838 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2020-08-18 20:26:33,838 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-18 20:26:33,838 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2020-08-18 20:26:33,838 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 53 [2020-08-18 20:26:33,838 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:33,838 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2020-08-18 20:26:33,839 INFO L480 AbstractCegarLoop]: Interpolant automaton has 46 states. [2020-08-18 20:26:33,839 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2020-08-18 20:26:33,839 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-18 20:26:33,839 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:33,839 INFO L422 BasicCegarLoop]: trace histogram [44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:33,839 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2020-08-18 20:26:33,840 INFO L427 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:33,840 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:33,840 INFO L82 PathProgramCache]: Analyzing trace with hash 1289649022, now seen corresponding path program 44 times [2020-08-18 20:26:33,840 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:33,840 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1430423361] [2020-08-18 20:26:33,840 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:33,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:35,313 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:35,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:35,320 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 990 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:26:35,320 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1430423361] [2020-08-18 20:26:35,320 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:35,320 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47] total 47 [2020-08-18 20:26:35,320 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1413052648] [2020-08-18 20:26:35,320 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2020-08-18 20:26:35,321 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:35,321 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2020-08-18 20:26:35,321 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=2027, Unknown=0, NotChecked=0, Total=2162 [2020-08-18 20:26:35,321 INFO L87 Difference]: Start difference. First operand 55 states and 55 transitions. Second operand 47 states. [2020-08-18 20:26:36,679 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:36,679 INFO L93 Difference]: Finished difference Result 61 states and 61 transitions. [2020-08-18 20:26:36,679 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2020-08-18 20:26:36,680 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 54 [2020-08-18 20:26:36,680 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:36,681 INFO L225 Difference]: With dead ends: 61 [2020-08-18 20:26:36,681 INFO L226 Difference]: Without dead ends: 56 [2020-08-18 20:26:36,682 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=135, Invalid=2027, Unknown=0, NotChecked=0, Total=2162 [2020-08-18 20:26:36,682 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-08-18 20:26:36,685 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2020-08-18 20:26:36,685 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-08-18 20:26:36,686 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 56 transitions. [2020-08-18 20:26:36,686 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 56 transitions. Word has length 54 [2020-08-18 20:26:36,686 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:36,686 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 56 transitions. [2020-08-18 20:26:36,686 INFO L480 AbstractCegarLoop]: Interpolant automaton has 47 states. [2020-08-18 20:26:36,686 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 56 transitions. [2020-08-18 20:26:36,687 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-08-18 20:26:36,687 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:36,687 INFO L422 BasicCegarLoop]: trace histogram [45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:36,687 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2020-08-18 20:26:36,687 INFO L427 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:36,688 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:36,688 INFO L82 PathProgramCache]: Analyzing trace with hash 1360875281, now seen corresponding path program 45 times [2020-08-18 20:26:36,688 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:36,688 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [634066287] [2020-08-18 20:26:36,688 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:36,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:38,284 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:38,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:38,291 INFO L134 CoverageAnalysis]: Checked inductivity of 1035 backedges. 0 proven. 1035 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:26:38,292 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [634066287] [2020-08-18 20:26:38,292 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:38,292 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48] total 48 [2020-08-18 20:26:38,292 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1422552431] [2020-08-18 20:26:38,292 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-08-18 20:26:38,293 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:38,293 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-08-18 20:26:38,293 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=2118, Unknown=0, NotChecked=0, Total=2256 [2020-08-18 20:26:38,293 INFO L87 Difference]: Start difference. First operand 56 states and 56 transitions. Second operand 48 states. [2020-08-18 20:26:39,687 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:39,687 INFO L93 Difference]: Finished difference Result 62 states and 62 transitions. [2020-08-18 20:26:39,688 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-08-18 20:26:39,688 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 55 [2020-08-18 20:26:39,688 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:39,689 INFO L225 Difference]: With dead ends: 62 [2020-08-18 20:26:39,689 INFO L226 Difference]: Without dead ends: 57 [2020-08-18 20:26:39,690 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=138, Invalid=2118, Unknown=0, NotChecked=0, Total=2256 [2020-08-18 20:26:39,690 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-08-18 20:26:39,694 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2020-08-18 20:26:39,694 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-18 20:26:39,694 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2020-08-18 20:26:39,694 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 55 [2020-08-18 20:26:39,695 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:39,695 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2020-08-18 20:26:39,695 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-08-18 20:26:39,695 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2020-08-18 20:26:39,695 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-18 20:26:39,695 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:39,696 INFO L422 BasicCegarLoop]: trace histogram [46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:39,696 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2020-08-18 20:26:39,696 INFO L427 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:39,696 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:39,696 INFO L82 PathProgramCache]: Analyzing trace with hash -726077986, now seen corresponding path program 46 times [2020-08-18 20:26:39,696 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:39,697 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [244881794] [2020-08-18 20:26:39,697 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:39,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:41,462 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:41,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:41,469 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:26:41,470 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [244881794] [2020-08-18 20:26:41,470 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:41,470 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49] total 49 [2020-08-18 20:26:41,470 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [5881316] [2020-08-18 20:26:41,470 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2020-08-18 20:26:41,471 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:41,471 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2020-08-18 20:26:41,471 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=2211, Unknown=0, NotChecked=0, Total=2352 [2020-08-18 20:26:41,471 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 49 states. [2020-08-18 20:26:42,928 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:42,929 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2020-08-18 20:26:42,929 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2020-08-18 20:26:42,929 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 56 [2020-08-18 20:26:42,930 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:42,930 INFO L225 Difference]: With dead ends: 63 [2020-08-18 20:26:42,930 INFO L226 Difference]: Without dead ends: 58 [2020-08-18 20:26:42,931 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=141, Invalid=2211, Unknown=0, NotChecked=0, Total=2352 [2020-08-18 20:26:42,931 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-18 20:26:42,934 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2020-08-18 20:26:42,934 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-08-18 20:26:42,935 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 58 transitions. [2020-08-18 20:26:42,935 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 58 transitions. Word has length 56 [2020-08-18 20:26:42,935 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:42,935 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 58 transitions. [2020-08-18 20:26:42,935 INFO L480 AbstractCegarLoop]: Interpolant automaton has 49 states. [2020-08-18 20:26:42,935 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 58 transitions. [2020-08-18 20:26:42,936 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-08-18 20:26:42,936 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:42,936 INFO L422 BasicCegarLoop]: trace histogram [47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:42,936 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2020-08-18 20:26:42,936 INFO L427 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:42,936 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:42,937 INFO L82 PathProgramCache]: Analyzing trace with hash -997119823, now seen corresponding path program 47 times [2020-08-18 20:26:42,937 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:42,937 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [262765773] [2020-08-18 20:26:42,937 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:42,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat