/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=NARROWEST -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/id_o20.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-18 21:54:40,322 INFO L177 SettingsManager]: Resetting all preferences to default values... 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[2020-08-18 21:54:40,362 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 21:54:40,363 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 21:54:40,364 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 21:54:40,366 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 21:54:40,366 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 21:54:40,368 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 21:54:40,370 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 21:54:40,372 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 21:54:40,373 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 21:54:40,374 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 21:54:40,376 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 21:54:40,376 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 21:54:40,379 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-18 21:54:40,387 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 21:54:40,388 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 21:54:40,389 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 21:54:40,392 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 21:54:40,436 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 21:54:40,439 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 21:54:40,441 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 21:54:40,441 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 21:54:40,442 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 21:54:40,442 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 21:54:40,442 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 21:54:40,442 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 21:54:40,442 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 21:54:40,443 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 21:54:40,443 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 21:54:40,443 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 21:54:40,443 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 21:54:40,443 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 21:54:40,444 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 21:54:40,446 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 21:54:40,446 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 21:54:40,446 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 21:54:40,446 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 21:54:40,447 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 21:54:40,447 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 21:54:40,447 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 21:54:40,447 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 21:54:40,447 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 21:54:40,448 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 21:54:40,448 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 21:54:40,448 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 21:54:40,448 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 21:54:40,448 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 21:54:40,449 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=NARROWEST; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=NARROWEST; [2020-08-18 21:54:40,758 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 21:54:40,780 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 21:54:40,786 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 21:54:40,789 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 21:54:40,789 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 21:54:40,790 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/id_o20.c [2020-08-18 21:54:40,865 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/ffbee4b54/ec814a31a53a4cbdbf0113739c13e81b/FLAG1d40c2f20 [2020-08-18 21:54:41,350 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 21:54:41,350 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/recursive-simple/id_o20.c [2020-08-18 21:54:41,356 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/ffbee4b54/ec814a31a53a4cbdbf0113739c13e81b/FLAG1d40c2f20 [2020-08-18 21:54:41,722 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/ffbee4b54/ec814a31a53a4cbdbf0113739c13e81b [2020-08-18 21:54:41,730 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 21:54:41,732 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 21:54:41,733 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 21:54:41,733 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 21:54:41,737 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 21:54:41,738 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 09:54:41" (1/1) ... [2020-08-18 21:54:41,741 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6ee0cdab and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:54:41, skipping insertion in model container [2020-08-18 21:54:41,742 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 09:54:41" (1/1) ... [2020-08-18 21:54:41,750 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 21:54:41,770 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 21:54:41,960 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 21:54:41,964 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 21:54:41,980 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 21:54:41,995 INFO L208 MainTranslator]: Completed translation [2020-08-18 21:54:41,996 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:54:41 WrapperNode [2020-08-18 21:54:41,996 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 21:54:41,997 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 21:54:41,997 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 21:54:41,997 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 21:54:42,012 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:54:41" (1/1) ... [2020-08-18 21:54:42,013 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:54:41" (1/1) ... [2020-08-18 21:54:42,018 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:54:41" (1/1) ... [2020-08-18 21:54:42,018 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:54:41" (1/1) ... [2020-08-18 21:54:42,022 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:54:41" (1/1) ... [2020-08-18 21:54:42,025 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:54:41" (1/1) ... [2020-08-18 21:54:42,026 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:54:41" (1/1) ... [2020-08-18 21:54:42,027 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 21:54:42,028 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 21:54:42,028 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 21:54:42,028 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 21:54:42,029 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:54:41" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 21:54:42,178 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 21:54:42,179 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 21:54:42,179 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2020-08-18 21:54:42,179 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 21:54:42,179 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-08-18 21:54:42,179 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 21:54:42,179 INFO L130 BoogieDeclarations]: Found specification of procedure id [2020-08-18 21:54:42,180 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 21:54:42,180 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 21:54:42,180 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 21:54:42,338 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 21:54:42,338 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-08-18 21:54:42,342 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 09:54:42 BoogieIcfgContainer [2020-08-18 21:54:42,342 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 21:54:42,343 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 21:54:42,343 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 21:54:42,347 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 21:54:42,347 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 09:54:41" (1/3) ... [2020-08-18 21:54:42,348 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7b2f41ec and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 09:54:42, skipping insertion in model container [2020-08-18 21:54:42,348 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:54:41" (2/3) ... [2020-08-18 21:54:42,348 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7b2f41ec and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 09:54:42, skipping insertion in model container [2020-08-18 21:54:42,349 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 09:54:42" (3/3) ... [2020-08-18 21:54:42,351 INFO L109 eAbstractionObserver]: Analyzing ICFG id_o20.c [2020-08-18 21:54:42,361 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 21:54:42,368 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-18 21:54:42,383 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-18 21:54:42,407 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 21:54:42,408 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 21:54:42,408 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 21:54:42,408 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 21:54:42,408 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 21:54:42,408 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 21:54:42,409 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 21:54:42,409 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 21:54:42,426 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-08-18 21:54:42,431 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-18 21:54:42,431 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:54:42,432 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:54:42,433 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:54:42,437 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:54:42,438 INFO L82 PathProgramCache]: Analyzing trace with hash -872342019, now seen corresponding path program 1 times [2020-08-18 21:54:42,445 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:54:42,446 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [211324455] [2020-08-18 21:54:42,446 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:54:42,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:42,755 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 5 [2020-08-18 21:54:42,817 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:54:42,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:42,822 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-18 21:54:42,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:42,864 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 21:54:42,865 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [211324455] [2020-08-18 21:54:42,866 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 21:54:42,867 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-18 21:54:42,868 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [645139634] [2020-08-18 21:54:42,872 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 21:54:42,872 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:54:42,883 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 21:54:42,884 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-18 21:54:42,886 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 5 states. [2020-08-18 21:54:42,948 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:54:42,948 INFO L93 Difference]: Finished difference Result 32 states and 35 transitions. [2020-08-18 21:54:42,949 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 21:54:42,950 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-08-18 21:54:42,950 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:54:42,959 INFO L225 Difference]: With dead ends: 32 [2020-08-18 21:54:42,960 INFO L226 Difference]: Without dead ends: 18 [2020-08-18 21:54:42,964 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-18 21:54:42,984 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-08-18 21:54:43,008 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-08-18 21:54:43,009 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-18 21:54:43,010 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2020-08-18 21:54:43,012 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2020-08-18 21:54:43,012 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:54:43,013 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2020-08-18 21:54:43,013 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 21:54:43,013 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2020-08-18 21:54:43,015 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-18 21:54:43,015 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:54:43,015 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:54:43,016 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 21:54:43,016 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:54:43,016 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:54:43,016 INFO L82 PathProgramCache]: Analyzing trace with hash -953570577, now seen corresponding path program 1 times [2020-08-18 21:54:43,017 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:54:43,017 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [473849656] [2020-08-18 21:54:43,017 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:54:43,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:43,114 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:54:43,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:43,118 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-18 21:54:43,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:43,184 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:43,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:43,218 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-08-18 21:54:43,218 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [473849656] [2020-08-18 21:54:43,219 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:54:43,219 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-18 21:54:43,219 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1773125798] [2020-08-18 21:54:43,221 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-18 21:54:43,221 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:54:43,222 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-18 21:54:43,222 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-08-18 21:54:43,222 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 7 states. [2020-08-18 21:54:43,251 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:54:43,251 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2020-08-18 21:54:43,252 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-18 21:54:43,252 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 19 [2020-08-18 21:54:43,253 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:54:43,254 INFO L225 Difference]: With dead ends: 25 [2020-08-18 21:54:43,254 INFO L226 Difference]: Without dead ends: 21 [2020-08-18 21:54:43,256 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-08-18 21:54:43,256 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-18 21:54:43,261 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-08-18 21:54:43,261 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-18 21:54:43,263 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2020-08-18 21:54:43,263 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 19 [2020-08-18 21:54:43,263 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:54:43,263 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2020-08-18 21:54:43,264 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-18 21:54:43,264 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2020-08-18 21:54:43,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-18 21:54:43,265 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:54:43,265 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:54:43,266 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 21:54:43,266 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:54:43,266 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:54:43,267 INFO L82 PathProgramCache]: Analyzing trace with hash 397359997, now seen corresponding path program 2 times [2020-08-18 21:54:43,267 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:54:43,268 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1972749307] [2020-08-18 21:54:43,268 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:54:43,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:43,391 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:54:43,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:43,394 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-18 21:54:43,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:43,442 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:43,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:43,497 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:43,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:43,535 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2020-08-18 21:54:43,535 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1972749307] [2020-08-18 21:54:43,536 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:54:43,536 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-18 21:54:43,536 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1010269985] [2020-08-18 21:54:43,537 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-18 21:54:43,537 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:54:43,538 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-18 21:54:43,538 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-08-18 21:54:43,539 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 9 states. [2020-08-18 21:54:43,589 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:54:43,589 INFO L93 Difference]: Finished difference Result 28 states and 29 transitions. [2020-08-18 21:54:43,590 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-18 21:54:43,590 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 25 [2020-08-18 21:54:43,591 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:54:43,592 INFO L225 Difference]: With dead ends: 28 [2020-08-18 21:54:43,592 INFO L226 Difference]: Without dead ends: 24 [2020-08-18 21:54:43,593 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-08-18 21:54:43,594 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-18 21:54:43,599 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-08-18 21:54:43,599 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-18 21:54:43,600 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2020-08-18 21:54:43,601 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 25 [2020-08-18 21:54:43,601 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:54:43,601 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2020-08-18 21:54:43,602 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-18 21:54:43,602 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2020-08-18 21:54:43,603 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-18 21:54:43,603 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:54:43,604 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:54:43,604 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-18 21:54:43,604 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:54:43,605 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:54:43,605 INFO L82 PathProgramCache]: Analyzing trace with hash 1198310127, now seen corresponding path program 3 times [2020-08-18 21:54:43,605 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:54:43,606 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1274778161] [2020-08-18 21:54:43,606 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:54:43,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:43,726 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:54:43,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:43,732 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-18 21:54:43,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:43,828 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:43,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:43,880 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:43,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:43,923 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:43,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:43,952 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-08-18 21:54:43,952 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1274778161] [2020-08-18 21:54:43,953 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:54:43,953 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-18 21:54:43,953 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1485958609] [2020-08-18 21:54:43,954 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-18 21:54:43,954 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:54:43,954 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-18 21:54:43,955 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2020-08-18 21:54:43,955 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 11 states. [2020-08-18 21:54:44,011 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:54:44,012 INFO L93 Difference]: Finished difference Result 31 states and 32 transitions. [2020-08-18 21:54:44,012 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-18 21:54:44,013 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 31 [2020-08-18 21:54:44,013 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:54:44,014 INFO L225 Difference]: With dead ends: 31 [2020-08-18 21:54:44,014 INFO L226 Difference]: Without dead ends: 27 [2020-08-18 21:54:44,015 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2020-08-18 21:54:44,016 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-08-18 21:54:44,021 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-08-18 21:54:44,021 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-18 21:54:44,022 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2020-08-18 21:54:44,022 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 31 [2020-08-18 21:54:44,023 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:54:44,023 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2020-08-18 21:54:44,023 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-18 21:54:44,023 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2020-08-18 21:54:44,024 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-18 21:54:44,025 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:54:44,025 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:54:44,026 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-18 21:54:44,026 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:54:44,026 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:54:44,026 INFO L82 PathProgramCache]: Analyzing trace with hash 1080764669, now seen corresponding path program 4 times [2020-08-18 21:54:44,027 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:54:44,027 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1860800567] [2020-08-18 21:54:44,027 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:54:44,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:44,083 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:54:44,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:44,086 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-18 21:54:44,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:44,132 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:44,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:44,186 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:44,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:44,237 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:44,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:44,282 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:44,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:44,313 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2020-08-18 21:54:44,314 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1860800567] [2020-08-18 21:54:44,314 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:54:44,314 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-18 21:54:44,315 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [128082543] [2020-08-18 21:54:44,315 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-18 21:54:44,316 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:54:44,316 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-18 21:54:44,316 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2020-08-18 21:54:44,316 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 13 states. [2020-08-18 21:54:44,391 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:54:44,391 INFO L93 Difference]: Finished difference Result 34 states and 35 transitions. [2020-08-18 21:54:44,391 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-18 21:54:44,392 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 37 [2020-08-18 21:54:44,392 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:54:44,393 INFO L225 Difference]: With dead ends: 34 [2020-08-18 21:54:44,393 INFO L226 Difference]: Without dead ends: 30 [2020-08-18 21:54:44,394 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2020-08-18 21:54:44,395 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-18 21:54:44,399 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-08-18 21:54:44,400 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-08-18 21:54:44,401 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2020-08-18 21:54:44,401 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 37 [2020-08-18 21:54:44,401 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:54:44,402 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2020-08-18 21:54:44,402 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-18 21:54:44,402 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2020-08-18 21:54:44,403 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-18 21:54:44,403 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:54:44,404 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:54:44,404 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-18 21:54:44,404 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:54:44,404 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:54:44,405 INFO L82 PathProgramCache]: Analyzing trace with hash -1752970513, now seen corresponding path program 5 times [2020-08-18 21:54:44,405 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:54:44,405 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1640086096] [2020-08-18 21:54:44,405 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:54:44,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:44,470 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:54:44,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:44,472 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-18 21:54:44,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:44,520 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:44,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:44,563 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:44,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:44,614 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:44,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:44,664 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:44,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:44,713 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:44,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:44,752 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-08-18 21:54:44,753 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1640086096] [2020-08-18 21:54:44,753 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:54:44,753 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-18 21:54:44,754 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2122361604] [2020-08-18 21:54:44,754 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-18 21:54:44,754 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:54:44,755 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-18 21:54:44,755 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2020-08-18 21:54:44,755 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand 15 states. [2020-08-18 21:54:44,869 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:54:44,869 INFO L93 Difference]: Finished difference Result 37 states and 38 transitions. [2020-08-18 21:54:44,869 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-18 21:54:44,869 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 43 [2020-08-18 21:54:44,870 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:54:44,871 INFO L225 Difference]: With dead ends: 37 [2020-08-18 21:54:44,871 INFO L226 Difference]: Without dead ends: 33 [2020-08-18 21:54:44,872 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2020-08-18 21:54:44,872 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-18 21:54:44,879 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-08-18 21:54:44,879 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-18 21:54:44,880 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2020-08-18 21:54:44,880 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 43 [2020-08-18 21:54:44,881 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:54:44,881 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2020-08-18 21:54:44,881 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-18 21:54:44,881 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2020-08-18 21:54:44,883 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-08-18 21:54:44,883 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:54:44,883 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:54:44,883 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-18 21:54:44,883 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:54:44,884 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:54:44,884 INFO L82 PathProgramCache]: Analyzing trace with hash -1590630787, now seen corresponding path program 6 times [2020-08-18 21:54:44,884 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:54:44,884 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1513998980] [2020-08-18 21:54:44,885 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:54:44,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:44,935 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:54:44,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:44,937 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-18 21:54:44,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:44,975 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:44,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:45,014 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:45,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:45,060 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:45,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:45,107 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:45,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:45,153 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:45,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:45,200 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:45,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:45,238 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2020-08-18 21:54:45,238 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1513998980] [2020-08-18 21:54:45,239 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:54:45,239 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-18 21:54:45,239 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2884402] [2020-08-18 21:54:45,240 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-18 21:54:45,240 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:54:45,240 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-18 21:54:45,241 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2020-08-18 21:54:45,241 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 17 states. [2020-08-18 21:54:45,359 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:54:45,359 INFO L93 Difference]: Finished difference Result 40 states and 41 transitions. [2020-08-18 21:54:45,360 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-18 21:54:45,360 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 49 [2020-08-18 21:54:45,361 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:54:45,361 INFO L225 Difference]: With dead ends: 40 [2020-08-18 21:54:45,362 INFO L226 Difference]: Without dead ends: 36 [2020-08-18 21:54:45,363 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2020-08-18 21:54:45,363 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-18 21:54:45,368 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-08-18 21:54:45,368 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-18 21:54:45,369 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2020-08-18 21:54:45,369 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 49 [2020-08-18 21:54:45,370 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:54:45,370 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2020-08-18 21:54:45,370 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-18 21:54:45,370 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2020-08-18 21:54:45,371 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-08-18 21:54:45,371 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:54:45,372 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:54:45,372 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-18 21:54:45,372 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:54:45,372 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:54:45,373 INFO L82 PathProgramCache]: Analyzing trace with hash 1532150511, now seen corresponding path program 7 times [2020-08-18 21:54:45,373 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:54:45,373 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [725040134] [2020-08-18 21:54:45,373 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:54:45,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:45,435 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:54:45,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:45,437 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-18 21:54:45,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:45,477 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:45,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:45,522 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:45,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:45,585 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:45,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:45,630 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:45,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:45,678 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:45,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:45,729 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:45,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:45,783 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:45,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:45,824 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2020-08-18 21:54:45,825 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [725040134] [2020-08-18 21:54:45,825 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:54:45,826 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-18 21:54:45,826 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1698323213] [2020-08-18 21:54:45,826 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-18 21:54:45,827 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:54:45,827 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-18 21:54:45,827 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=307, Unknown=0, NotChecked=0, Total=342 [2020-08-18 21:54:45,828 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand 19 states. [2020-08-18 21:54:45,987 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:54:45,987 INFO L93 Difference]: Finished difference Result 43 states and 44 transitions. [2020-08-18 21:54:45,987 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-18 21:54:45,987 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 55 [2020-08-18 21:54:45,988 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:54:45,989 INFO L225 Difference]: With dead ends: 43 [2020-08-18 21:54:45,989 INFO L226 Difference]: Without dead ends: 39 [2020-08-18 21:54:45,990 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=35, Invalid=307, Unknown=0, NotChecked=0, Total=342 [2020-08-18 21:54:45,990 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-18 21:54:45,995 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-08-18 21:54:45,995 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-18 21:54:45,996 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2020-08-18 21:54:45,996 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 55 [2020-08-18 21:54:45,996 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:54:45,996 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2020-08-18 21:54:45,997 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-18 21:54:45,997 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2020-08-18 21:54:45,998 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2020-08-18 21:54:46,000 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:54:46,000 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:54:46,000 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-18 21:54:46,001 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:54:46,001 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:54:46,001 INFO L82 PathProgramCache]: Analyzing trace with hash 1140618237, now seen corresponding path program 8 times [2020-08-18 21:54:46,001 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:54:46,002 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1301343033] [2020-08-18 21:54:46,002 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:54:46,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:46,069 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:54:46,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:46,071 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-18 21:54:46,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:46,119 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:46,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:46,169 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:46,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:46,218 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:46,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:46,266 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:46,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:46,337 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:46,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:46,388 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:46,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:46,446 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:46,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:46,508 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:46,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:46,567 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2020-08-18 21:54:46,568 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1301343033] [2020-08-18 21:54:46,568 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:54:46,568 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-18 21:54:46,568 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1998912330] [2020-08-18 21:54:46,569 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-18 21:54:46,569 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:54:46,570 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-18 21:54:46,570 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=381, Unknown=0, NotChecked=0, Total=420 [2020-08-18 21:54:46,570 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 21 states. [2020-08-18 21:54:46,750 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:54:46,750 INFO L93 Difference]: Finished difference Result 46 states and 47 transitions. [2020-08-18 21:54:46,750 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-18 21:54:46,751 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 61 [2020-08-18 21:54:46,751 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:54:46,752 INFO L225 Difference]: With dead ends: 46 [2020-08-18 21:54:46,752 INFO L226 Difference]: Without dead ends: 42 [2020-08-18 21:54:46,755 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=39, Invalid=381, Unknown=0, NotChecked=0, Total=420 [2020-08-18 21:54:46,756 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-18 21:54:46,764 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-08-18 21:54:46,764 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-18 21:54:46,766 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 43 transitions. [2020-08-18 21:54:46,766 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 43 transitions. Word has length 61 [2020-08-18 21:54:46,766 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:54:46,767 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 43 transitions. [2020-08-18 21:54:46,767 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-18 21:54:46,767 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 43 transitions. [2020-08-18 21:54:46,771 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-08-18 21:54:46,771 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:54:46,771 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:54:46,771 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-18 21:54:46,772 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:54:46,772 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:54:46,772 INFO L82 PathProgramCache]: Analyzing trace with hash -1749177617, now seen corresponding path program 9 times [2020-08-18 21:54:46,772 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:54:46,772 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1448777788] [2020-08-18 21:54:46,773 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:54:46,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:46,855 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:54:46,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:46,857 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-18 21:54:46,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:46,914 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:46,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:46,978 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:46,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:47,025 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:47,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:47,076 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:47,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:47,132 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:47,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:47,189 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:47,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:47,249 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:47,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:47,319 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:47,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:47,376 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:47,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:47,438 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2020-08-18 21:54:47,439 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1448777788] [2020-08-18 21:54:47,439 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:54:47,439 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-18 21:54:47,440 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [567898524] [2020-08-18 21:54:47,440 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-18 21:54:47,440 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:54:47,441 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-18 21:54:47,441 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=463, Unknown=0, NotChecked=0, Total=506 [2020-08-18 21:54:47,442 INFO L87 Difference]: Start difference. First operand 42 states and 43 transitions. Second operand 23 states. [2020-08-18 21:54:47,651 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:54:47,652 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2020-08-18 21:54:47,652 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-18 21:54:47,653 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 67 [2020-08-18 21:54:47,653 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:54:47,654 INFO L225 Difference]: With dead ends: 49 [2020-08-18 21:54:47,654 INFO L226 Difference]: Without dead ends: 45 [2020-08-18 21:54:47,655 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=43, Invalid=463, Unknown=0, NotChecked=0, Total=506 [2020-08-18 21:54:47,655 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-08-18 21:54:47,660 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2020-08-18 21:54:47,660 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-18 21:54:47,661 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 46 transitions. [2020-08-18 21:54:47,661 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 46 transitions. Word has length 67 [2020-08-18 21:54:47,661 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:54:47,662 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 46 transitions. [2020-08-18 21:54:47,662 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-18 21:54:47,662 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 46 transitions. [2020-08-18 21:54:47,663 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2020-08-18 21:54:47,663 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:54:47,663 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:54:47,663 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-18 21:54:47,664 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:54:47,664 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:54:47,664 INFO L82 PathProgramCache]: Analyzing trace with hash -1580609155, now seen corresponding path program 10 times [2020-08-18 21:54:47,664 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:54:47,665 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1901846533] [2020-08-18 21:54:47,665 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:54:47,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:47,725 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:54:47,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:47,727 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-18 21:54:47,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:47,771 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:47,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:47,817 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:47,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:47,864 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:47,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:47,912 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:47,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:47,961 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:47,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:48,012 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:48,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:48,064 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:48,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:48,127 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:48,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:48,187 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:48,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:48,249 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:48,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:48,310 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2020-08-18 21:54:48,311 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1901846533] [2020-08-18 21:54:48,311 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:54:48,311 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-18 21:54:48,311 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [382298397] [2020-08-18 21:54:48,312 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-18 21:54:48,312 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:54:48,313 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-18 21:54:48,313 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=553, Unknown=0, NotChecked=0, Total=600 [2020-08-18 21:54:48,313 INFO L87 Difference]: Start difference. First operand 45 states and 46 transitions. Second operand 25 states. [2020-08-18 21:54:48,566 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:54:48,566 INFO L93 Difference]: Finished difference Result 52 states and 53 transitions. [2020-08-18 21:54:48,566 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-18 21:54:48,567 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 73 [2020-08-18 21:54:48,567 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:54:48,568 INFO L225 Difference]: With dead ends: 52 [2020-08-18 21:54:48,568 INFO L226 Difference]: Without dead ends: 48 [2020-08-18 21:54:48,570 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=47, Invalid=553, Unknown=0, NotChecked=0, Total=600 [2020-08-18 21:54:48,570 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-18 21:54:48,574 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-08-18 21:54:48,574 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-18 21:54:48,575 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 49 transitions. [2020-08-18 21:54:48,576 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 49 transitions. Word has length 73 [2020-08-18 21:54:48,576 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:54:48,576 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 49 transitions. [2020-08-18 21:54:48,576 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-18 21:54:48,576 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 49 transitions. [2020-08-18 21:54:48,577 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2020-08-18 21:54:48,578 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:54:48,578 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:54:48,578 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-18 21:54:48,578 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:54:48,579 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:54:48,579 INFO L82 PathProgramCache]: Analyzing trace with hash -223837457, now seen corresponding path program 11 times [2020-08-18 21:54:48,579 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:54:48,579 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2133136454] [2020-08-18 21:54:48,579 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:54:48,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:48,638 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:54:48,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:48,640 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-18 21:54:48,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:48,685 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:48,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:48,740 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:48,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:48,798 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:48,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:48,861 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:48,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:48,922 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:48,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:48,984 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:48,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:49,061 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:49,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:49,122 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:49,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:49,185 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:49,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:49,248 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:49,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:49,312 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:49,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:49,390 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2020-08-18 21:54:49,390 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2133136454] [2020-08-18 21:54:49,390 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:54:49,391 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-18 21:54:49,391 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1588635812] [2020-08-18 21:54:49,391 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-18 21:54:49,392 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:54:49,392 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-18 21:54:49,392 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=651, Unknown=0, NotChecked=0, Total=702 [2020-08-18 21:54:49,393 INFO L87 Difference]: Start difference. First operand 48 states and 49 transitions. Second operand 27 states. [2020-08-18 21:54:49,681 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:54:49,682 INFO L93 Difference]: Finished difference Result 55 states and 56 transitions. [2020-08-18 21:54:49,682 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-18 21:54:49,682 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 79 [2020-08-18 21:54:49,683 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:54:49,683 INFO L225 Difference]: With dead ends: 55 [2020-08-18 21:54:49,683 INFO L226 Difference]: Without dead ends: 51 [2020-08-18 21:54:49,685 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=51, Invalid=651, Unknown=0, NotChecked=0, Total=702 [2020-08-18 21:54:49,685 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-08-18 21:54:49,690 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2020-08-18 21:54:49,690 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-18 21:54:49,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 52 transitions. [2020-08-18 21:54:49,691 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 52 transitions. Word has length 79 [2020-08-18 21:54:49,692 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:54:49,692 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 52 transitions. [2020-08-18 21:54:49,692 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-18 21:54:49,692 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 52 transitions. [2020-08-18 21:54:49,693 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2020-08-18 21:54:49,693 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:54:49,693 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:54:49,693 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-18 21:54:49,694 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:54:49,694 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:54:49,694 INFO L82 PathProgramCache]: Analyzing trace with hash 1653931773, now seen corresponding path program 12 times [2020-08-18 21:54:49,694 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:54:49,695 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [218486056] [2020-08-18 21:54:49,695 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:54:49,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:49,754 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:54:49,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:49,756 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-18 21:54:49,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:49,808 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:49,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:49,858 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:49,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:49,932 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:49,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:49,984 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:49,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:50,039 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:50,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:50,098 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:50,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:50,170 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:50,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:50,248 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:50,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:50,313 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:50,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:50,379 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:50,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:50,441 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:50,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:50,500 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:50,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:50,577 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2020-08-18 21:54:50,577 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [218486056] [2020-08-18 21:54:50,577 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:54:50,577 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-18 21:54:50,578 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [366397631] [2020-08-18 21:54:50,578 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-18 21:54:50,578 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:54:50,579 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-18 21:54:50,579 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=757, Unknown=0, NotChecked=0, Total=812 [2020-08-18 21:54:50,579 INFO L87 Difference]: Start difference. First operand 51 states and 52 transitions. Second operand 29 states. [2020-08-18 21:54:50,906 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:54:50,907 INFO L93 Difference]: Finished difference Result 58 states and 59 transitions. [2020-08-18 21:54:50,907 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-18 21:54:50,907 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 85 [2020-08-18 21:54:50,908 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:54:50,909 INFO L225 Difference]: With dead ends: 58 [2020-08-18 21:54:50,909 INFO L226 Difference]: Without dead ends: 54 [2020-08-18 21:54:50,910 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=55, Invalid=757, Unknown=0, NotChecked=0, Total=812 [2020-08-18 21:54:50,911 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-18 21:54:50,915 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2020-08-18 21:54:50,915 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-08-18 21:54:50,916 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 55 transitions. [2020-08-18 21:54:50,916 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 55 transitions. Word has length 85 [2020-08-18 21:54:50,917 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:54:50,917 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 55 transitions. [2020-08-18 21:54:50,917 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-18 21:54:50,917 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 55 transitions. [2020-08-18 21:54:50,918 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2020-08-18 21:54:50,918 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:54:50,918 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:54:50,919 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-18 21:54:50,919 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:54:50,919 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:54:50,920 INFO L82 PathProgramCache]: Analyzing trace with hash -218674449, now seen corresponding path program 13 times [2020-08-18 21:54:50,920 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:54:50,920 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1318509412] [2020-08-18 21:54:50,920 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:54:50,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:50,989 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:54:50,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:50,991 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-18 21:54:51,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:51,052 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:51,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:51,118 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:51,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:51,203 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:51,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:51,278 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:51,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:51,357 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:51,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:51,435 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:51,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:51,504 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:51,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:51,567 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:51,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:51,632 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:51,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:51,701 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:51,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:51,777 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:51,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:51,859 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:51,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:51,947 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:51,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:52,077 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2020-08-18 21:54:52,078 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1318509412] [2020-08-18 21:54:52,079 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:54:52,079 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-18 21:54:52,080 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [121515628] [2020-08-18 21:54:52,080 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-18 21:54:52,080 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:54:52,081 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-18 21:54:52,082 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=871, Unknown=0, NotChecked=0, Total=930 [2020-08-18 21:54:52,082 INFO L87 Difference]: Start difference. First operand 54 states and 55 transitions. Second operand 31 states. [2020-08-18 21:54:52,424 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:54:52,424 INFO L93 Difference]: Finished difference Result 61 states and 62 transitions. [2020-08-18 21:54:52,425 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-18 21:54:52,425 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 91 [2020-08-18 21:54:52,425 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:54:52,426 INFO L225 Difference]: With dead ends: 61 [2020-08-18 21:54:52,426 INFO L226 Difference]: Without dead ends: 57 [2020-08-18 21:54:52,427 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=59, Invalid=871, Unknown=0, NotChecked=0, Total=930 [2020-08-18 21:54:52,428 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-08-18 21:54:52,432 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2020-08-18 21:54:52,432 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-18 21:54:52,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 58 transitions. [2020-08-18 21:54:52,433 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 58 transitions. Word has length 91 [2020-08-18 21:54:52,433 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:54:52,433 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 58 transitions. [2020-08-18 21:54:52,433 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-18 21:54:52,434 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 58 transitions. [2020-08-18 21:54:52,434 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2020-08-18 21:54:52,435 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:54:52,435 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:54:52,435 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-18 21:54:52,435 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:54:52,435 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:54:52,436 INFO L82 PathProgramCache]: Analyzing trace with hash 492436605, now seen corresponding path program 14 times [2020-08-18 21:54:52,436 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:54:52,436 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1534046372] [2020-08-18 21:54:52,436 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:54:52,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:52,511 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:54:52,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:52,512 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-18 21:54:52,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:52,563 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:52,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:52,617 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:52,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:52,674 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:52,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:52,748 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:52,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:52,824 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:52,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:52,903 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:52,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:52,975 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:52,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:53,041 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:53,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:53,105 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:53,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:53,175 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:53,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:53,255 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:53,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:53,326 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:53,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:53,436 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:53,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:53,503 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:53,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:53,598 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 301 trivial. 0 not checked. [2020-08-18 21:54:53,598 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1534046372] [2020-08-18 21:54:53,599 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:54:53,599 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-18 21:54:53,599 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [865567786] [2020-08-18 21:54:53,600 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-18 21:54:53,600 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:54:53,600 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-18 21:54:53,601 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=993, Unknown=0, NotChecked=0, Total=1056 [2020-08-18 21:54:53,601 INFO L87 Difference]: Start difference. First operand 57 states and 58 transitions. Second operand 33 states. [2020-08-18 21:54:54,032 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:54:54,032 INFO L93 Difference]: Finished difference Result 64 states and 65 transitions. [2020-08-18 21:54:54,033 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-18 21:54:54,033 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 97 [2020-08-18 21:54:54,034 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:54:54,034 INFO L225 Difference]: With dead ends: 64 [2020-08-18 21:54:54,034 INFO L226 Difference]: Without dead ends: 60 [2020-08-18 21:54:54,039 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=63, Invalid=993, Unknown=0, NotChecked=0, Total=1056 [2020-08-18 21:54:54,040 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-08-18 21:54:54,051 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2020-08-18 21:54:54,051 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-08-18 21:54:54,052 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 61 transitions. [2020-08-18 21:54:54,052 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 61 transitions. Word has length 97 [2020-08-18 21:54:54,053 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:54:54,053 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 61 transitions. [2020-08-18 21:54:54,053 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-18 21:54:54,053 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 61 transitions. [2020-08-18 21:54:54,054 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2020-08-18 21:54:54,054 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:54:54,057 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:54:54,058 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-18 21:54:54,058 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:54:54,058 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:54:54,059 INFO L82 PathProgramCache]: Analyzing trace with hash 1083048687, now seen corresponding path program 15 times [2020-08-18 21:54:54,059 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:54:54,059 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1880068123] [2020-08-18 21:54:54,059 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:54:54,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:54,135 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:54:54,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:54,139 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-18 21:54:54,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:54,195 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:54,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:54,248 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:54,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:54,304 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:54,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:54,365 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:54,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:54,445 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:54,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:54,503 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:54,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:54,567 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:54,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:54,646 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:54,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:54,728 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:54,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:54,816 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:54,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:54,899 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:54,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:54,977 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:54,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:55,055 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:55,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:55,137 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:55,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:55,220 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:55,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:55,371 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2020-08-18 21:54:55,371 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1880068123] [2020-08-18 21:54:55,374 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:54:55,375 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-18 21:54:55,375 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2010685494] [2020-08-18 21:54:55,375 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-18 21:54:55,376 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:54:55,376 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-18 21:54:55,377 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=1123, Unknown=0, NotChecked=0, Total=1190 [2020-08-18 21:54:55,377 INFO L87 Difference]: Start difference. First operand 60 states and 61 transitions. Second operand 35 states. [2020-08-18 21:54:55,896 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:54:55,896 INFO L93 Difference]: Finished difference Result 67 states and 68 transitions. [2020-08-18 21:54:55,897 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-18 21:54:55,897 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 103 [2020-08-18 21:54:55,898 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:54:55,898 INFO L225 Difference]: With dead ends: 67 [2020-08-18 21:54:55,898 INFO L226 Difference]: Without dead ends: 63 [2020-08-18 21:54:55,900 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=67, Invalid=1123, Unknown=0, NotChecked=0, Total=1190 [2020-08-18 21:54:55,904 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-08-18 21:54:55,910 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2020-08-18 21:54:55,911 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2020-08-18 21:54:55,911 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 64 transitions. [2020-08-18 21:54:55,912 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 64 transitions. Word has length 103 [2020-08-18 21:54:55,912 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:54:55,912 INFO L479 AbstractCegarLoop]: Abstraction has 63 states and 64 transitions. [2020-08-18 21:54:55,913 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-18 21:54:55,916 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 64 transitions. [2020-08-18 21:54:55,917 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2020-08-18 21:54:55,918 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:54:55,918 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:54:55,918 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-18 21:54:55,918 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:54:55,919 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:54:55,920 INFO L82 PathProgramCache]: Analyzing trace with hash 404015613, now seen corresponding path program 16 times [2020-08-18 21:54:55,920 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:54:55,920 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1967337343] [2020-08-18 21:54:55,921 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:54:55,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:55,999 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:54:56,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:56,001 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-18 21:54:56,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:56,052 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:56,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:56,124 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:56,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:56,179 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:56,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:56,238 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:56,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:56,298 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:56,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:56,360 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:56,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:56,425 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:56,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:56,489 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:56,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:56,570 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:56,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:56,662 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:56,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:56,755 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:56,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:56,853 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:56,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:56,945 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:56,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:57,027 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:57,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:57,113 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:57,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:57,200 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:57,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:57,378 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2020-08-18 21:54:57,379 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1967337343] [2020-08-18 21:54:57,379 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:54:57,379 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-18 21:54:57,379 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1233734248] [2020-08-18 21:54:57,381 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-18 21:54:57,382 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:54:57,382 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-18 21:54:57,383 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=1261, Unknown=0, NotChecked=0, Total=1332 [2020-08-18 21:54:57,383 INFO L87 Difference]: Start difference. First operand 63 states and 64 transitions. Second operand 37 states. [2020-08-18 21:54:57,952 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:54:57,952 INFO L93 Difference]: Finished difference Result 70 states and 71 transitions. [2020-08-18 21:54:57,952 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-18 21:54:57,952 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 109 [2020-08-18 21:54:57,953 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:54:57,954 INFO L225 Difference]: With dead ends: 70 [2020-08-18 21:54:57,954 INFO L226 Difference]: Without dead ends: 66 [2020-08-18 21:54:57,955 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=71, Invalid=1261, Unknown=0, NotChecked=0, Total=1332 [2020-08-18 21:54:57,955 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-08-18 21:54:57,963 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 66. [2020-08-18 21:54:57,963 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-08-18 21:54:57,964 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 67 transitions. [2020-08-18 21:54:57,964 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 67 transitions. Word has length 109 [2020-08-18 21:54:57,964 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:54:57,964 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 67 transitions. [2020-08-18 21:54:57,964 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-18 21:54:57,965 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 67 transitions. [2020-08-18 21:54:57,965 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2020-08-18 21:54:57,966 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:54:57,966 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:54:57,966 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-18 21:54:57,966 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:54:57,966 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:54:57,966 INFO L82 PathProgramCache]: Analyzing trace with hash -464475409, now seen corresponding path program 17 times [2020-08-18 21:54:57,967 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:54:57,967 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [360385065] [2020-08-18 21:54:57,967 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:54:57,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:58,039 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:54:58,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:58,040 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-18 21:54:58,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:58,091 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:58,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:58,144 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:58,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:58,197 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:58,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:58,267 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:58,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:58,327 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:58,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:58,396 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:58,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:58,457 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:58,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:58,527 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:58,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:58,616 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:58,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:58,689 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:58,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:58,791 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:58,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:58,894 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:58,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:59,006 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:59,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:59,121 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:59,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:59,242 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:59,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:59,361 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:59,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:59,487 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:54:59,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:54:59,728 INFO L134 CoverageAnalysis]: Checked inductivity of 884 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2020-08-18 21:54:59,729 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [360385065] [2020-08-18 21:54:59,729 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:54:59,729 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-18 21:54:59,730 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1797104552] [2020-08-18 21:54:59,732 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-18 21:54:59,736 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:54:59,736 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-18 21:54:59,739 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=1407, Unknown=0, NotChecked=0, Total=1482 [2020-08-18 21:54:59,740 INFO L87 Difference]: Start difference. First operand 66 states and 67 transitions. Second operand 39 states. [2020-08-18 21:55:00,445 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:55:00,446 INFO L93 Difference]: Finished difference Result 73 states and 74 transitions. [2020-08-18 21:55:00,446 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-18 21:55:00,446 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 115 [2020-08-18 21:55:00,447 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:55:00,447 INFO L225 Difference]: With dead ends: 73 [2020-08-18 21:55:00,448 INFO L226 Difference]: Without dead ends: 69 [2020-08-18 21:55:00,449 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=75, Invalid=1407, Unknown=0, NotChecked=0, Total=1482 [2020-08-18 21:55:00,450 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2020-08-18 21:55:00,454 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2020-08-18 21:55:00,455 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2020-08-18 21:55:00,455 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 70 transitions. [2020-08-18 21:55:00,456 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 70 transitions. Word has length 115 [2020-08-18 21:55:00,457 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:55:00,457 INFO L479 AbstractCegarLoop]: Abstraction has 69 states and 70 transitions. [2020-08-18 21:55:00,457 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-18 21:55:00,457 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 70 transitions. [2020-08-18 21:55:00,458 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2020-08-18 21:55:00,458 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:55:00,458 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 18, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:55:00,459 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-18 21:55:00,459 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:55:00,459 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:55:00,459 INFO L82 PathProgramCache]: Analyzing trace with hash 130115453, now seen corresponding path program 18 times [2020-08-18 21:55:00,460 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:55:00,460 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [541539526] [2020-08-18 21:55:00,460 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:55:00,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:55:00,569 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:55:00,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:55:00,570 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-18 21:55:00,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:55:00,631 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:55:00,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:55:00,700 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:55:00,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:55:00,758 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:55:00,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:55:00,826 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:55:00,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:55:00,892 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:55:00,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:55:00,959 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:55:00,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:55:01,044 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:55:01,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:55:01,133 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:55:01,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:55:01,245 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:55:01,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:55:01,331 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:55:01,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:55:01,416 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:55:01,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:55:01,504 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:55:01,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:55:01,580 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:55:01,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:55:01,663 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:55:01,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:55:01,744 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:55:01,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:55:01,841 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:55:01,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:55:01,961 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:55:01,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:55:02,074 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:55:02,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:55:02,249 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 495 trivial. 0 not checked. [2020-08-18 21:55:02,249 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [541539526] [2020-08-18 21:55:02,252 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:55:02,252 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-18 21:55:02,252 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [465841238] [2020-08-18 21:55:02,253 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-18 21:55:02,253 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:55:02,253 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-18 21:55:02,254 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=1561, Unknown=0, NotChecked=0, Total=1640 [2020-08-18 21:55:02,254 INFO L87 Difference]: Start difference. First operand 69 states and 70 transitions. Second operand 41 states. [2020-08-18 21:55:03,048 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:55:03,048 INFO L93 Difference]: Finished difference Result 76 states and 77 transitions. [2020-08-18 21:55:03,049 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-18 21:55:03,049 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 121 [2020-08-18 21:55:03,049 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:55:03,050 INFO L225 Difference]: With dead ends: 76 [2020-08-18 21:55:03,051 INFO L226 Difference]: Without dead ends: 72 [2020-08-18 21:55:03,052 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=79, Invalid=1561, Unknown=0, NotChecked=0, Total=1640 [2020-08-18 21:55:03,053 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-08-18 21:55:03,055 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 72. [2020-08-18 21:55:03,056 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2020-08-18 21:55:03,056 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 73 transitions. [2020-08-18 21:55:03,056 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 73 transitions. Word has length 121 [2020-08-18 21:55:03,057 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:55:03,057 INFO L479 AbstractCegarLoop]: Abstraction has 72 states and 73 transitions. [2020-08-18 21:55:03,057 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-18 21:55:03,057 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 73 transitions. [2020-08-18 21:55:03,058 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2020-08-18 21:55:03,058 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:55:03,059 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:55:03,059 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-18 21:55:03,059 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:55:03,059 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:55:03,059 INFO L82 PathProgramCache]: Analyzing trace with hash -2010955025, now seen corresponding path program 19 times [2020-08-18 21:55:03,060 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:55:03,060 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2025281231] [2020-08-18 21:55:03,060 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:55:03,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:55:03,134 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:55:03,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:55:03,135 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-18 21:55:03,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:55:03,202 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:55:03,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:55:03,263 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:55:03,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:55:03,323 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:55:03,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:55:03,385 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:55:03,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:55:03,453 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:55:03,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:55:03,524 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:55:03,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:55:03,596 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:55:03,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:55:03,667 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:55:03,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:55:03,742 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:55:03,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:55:03,829 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:55:03,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:55:03,911 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:55:03,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:55:04,007 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:55:04,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:55:04,092 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:55:04,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:55:04,185 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:55:04,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:55:04,278 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:55:04,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:55:04,374 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:55:04,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:55:04,473 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:55:04,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:55:04,580 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:55:04,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:55:04,710 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:55:04,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:55:04,879 INFO L134 CoverageAnalysis]: Checked inductivity of 1102 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 551 trivial. 0 not checked. [2020-08-18 21:55:04,879 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2025281231] [2020-08-18 21:55:04,880 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:55:04,880 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-18 21:55:04,880 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [798382382] [2020-08-18 21:55:04,880 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-18 21:55:04,880 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:55:04,881 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-18 21:55:04,881 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=1723, Unknown=0, NotChecked=0, Total=1806 [2020-08-18 21:55:04,881 INFO L87 Difference]: Start difference. First operand 72 states and 73 transitions. Second operand 43 states. [2020-08-18 21:55:05,743 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:55:05,744 INFO L93 Difference]: Finished difference Result 79 states and 80 transitions. [2020-08-18 21:55:05,744 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-08-18 21:55:05,744 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 127 [2020-08-18 21:55:05,745 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:55:05,746 INFO L225 Difference]: With dead ends: 79 [2020-08-18 21:55:05,746 INFO L226 Difference]: Without dead ends: 75 [2020-08-18 21:55:05,748 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=83, Invalid=1723, Unknown=0, NotChecked=0, Total=1806 [2020-08-18 21:55:05,748 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2020-08-18 21:55:05,751 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2020-08-18 21:55:05,752 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2020-08-18 21:55:05,752 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 76 transitions. [2020-08-18 21:55:05,752 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 76 transitions. Word has length 127 [2020-08-18 21:55:05,753 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:55:05,753 INFO L479 AbstractCegarLoop]: Abstraction has 75 states and 76 transitions. [2020-08-18 21:55:05,753 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-18 21:55:05,753 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 76 transitions. [2020-08-18 21:55:05,754 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2020-08-18 21:55:05,754 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:55:05,755 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 20, 20, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:55:05,755 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-18 21:55:05,755 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:55:05,755 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:55:05,755 INFO L82 PathProgramCache]: Analyzing trace with hash -799288067, now seen corresponding path program 20 times [2020-08-18 21:55:05,756 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:55:05,756 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [681662247] [2020-08-18 21:55:05,756 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:55:05,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-18 21:55:05,861 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-08-18 21:55:05,861 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-18 21:55:05,866 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-18 21:55:05,891 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 18.08 09:55:05 BoogieIcfgContainer [2020-08-18 21:55:05,892 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-18 21:55:05,894 INFO L168 Benchmark]: Toolchain (without parser) took 24161.72 ms. Allocated memory was 140.0 MB in the beginning and 528.5 MB in the end (delta: 388.5 MB). Free memory was 103.3 MB in the beginning and 311.4 MB in the end (delta: -208.1 MB). Peak memory consumption was 180.4 MB. Max. memory is 7.1 GB. [2020-08-18 21:55:05,894 INFO L168 Benchmark]: CDTParser took 0.22 ms. Allocated memory is still 140.0 MB. Free memory was 121.5 MB in the beginning and 121.3 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. [2020-08-18 21:55:05,895 INFO L168 Benchmark]: CACSL2BoogieTranslator took 263.32 ms. Allocated memory is still 140.0 MB. Free memory was 103.1 MB in the beginning and 93.8 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. [2020-08-18 21:55:05,895 INFO L168 Benchmark]: Boogie Preprocessor took 30.61 ms. Allocated memory is still 140.0 MB. Free memory was 93.8 MB in the beginning and 92.4 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. [2020-08-18 21:55:05,896 INFO L168 Benchmark]: RCFGBuilder took 314.36 ms. Allocated memory was 140.0 MB in the beginning and 201.9 MB in the end (delta: 61.9 MB). Free memory was 92.4 MB in the beginning and 170.7 MB in the end (delta: -78.2 MB). Peak memory consumption was 12.3 MB. Max. memory is 7.1 GB. [2020-08-18 21:55:05,896 INFO L168 Benchmark]: TraceAbstraction took 23548.65 ms. Allocated memory was 201.9 MB in the beginning and 528.5 MB in the end (delta: 326.6 MB). Free memory was 170.0 MB in the beginning and 311.4 MB in the end (delta: -141.4 MB). Peak memory consumption was 185.2 MB. Max. memory is 7.1 GB. [2020-08-18 21:55:05,899 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.22 ms. Allocated memory is still 140.0 MB. Free memory was 121.5 MB in the beginning and 121.3 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 263.32 ms. Allocated memory is still 140.0 MB. Free memory was 103.1 MB in the beginning and 93.8 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 30.61 ms. Allocated memory is still 140.0 MB. Free memory was 93.8 MB in the beginning and 92.4 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 314.36 ms. Allocated memory was 140.0 MB in the beginning and 201.9 MB in the end (delta: 61.9 MB). Free memory was 92.4 MB in the beginning and 170.7 MB in the end (delta: -78.2 MB). Peak memory consumption was 12.3 MB. Max. memory is 7.1 GB. * TraceAbstraction took 23548.65 ms. Allocated memory was 201.9 MB in the beginning and 528.5 MB in the end (delta: 326.6 MB). Free memory was 170.0 MB in the beginning and 311.4 MB in the end (delta: -141.4 MB). Peak memory consumption was 185.2 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 13]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L10] unsigned int input = __VERIFIER_nondet_uint(); [L11] CALL, EXPR id(input) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND TRUE x==0 [L5] return 0; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L11] RET, EXPR id(input) [L11] unsigned int result = id(input); [L12] COND TRUE result == 20 [L13] __VERIFIER_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 20 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 23.4s, OverallIterations: 21, TraceHistogramMax: 21, AutomataDifference: 6.2s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 684 SDtfs, 2 SDslu, 14532 SDs, 0 SdLazy, 8656 SolverSat, 0 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 4.6s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 940 GetRequests, 500 SyntacticMatches, 0 SemanticMatches, 440 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 10.5s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=75occurred in iteration=20, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 20 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.4s SatisfiabilityAnalysisTime, 16.0s InterpolantComputationTime, 1533 NumberOfCodeBlocks, 1533 NumberOfCodeBlocksAsserted, 21 NumberOfCheckSat, 1380 ConstructedInterpolants, 0 QuantifiedInterpolants, 465600 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 20 InterpolantComputations, 1 PerfectInterpolantSequences, 3800/7600 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...