/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=SMALLEST -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/ldv-regression/test24-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-18 17:06:00,397 INFO L177 SettingsManager]: Resetting all preferences to default values... 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[2020-08-18 17:06:00,466 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 17:06:00,469 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 17:06:00,471 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 17:06:00,472 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 17:06:00,474 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 17:06:00,476 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 17:06:00,477 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 17:06:00,486 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 17:06:00,488 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 17:06:00,489 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 17:06:00,491 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 17:06:00,493 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 17:06:00,506 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-18 17:06:00,520 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 17:06:00,521 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 17:06:00,522 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 17:06:00,523 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 17:06:00,546 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 17:06:00,546 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 17:06:00,547 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 17:06:00,548 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 17:06:00,548 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 17:06:00,548 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 17:06:00,548 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 17:06:00,548 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 17:06:00,549 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 17:06:00,549 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 17:06:00,549 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 17:06:00,549 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 17:06:00,549 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 17:06:00,550 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 17:06:00,550 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 17:06:00,550 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 17:06:00,550 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 17:06:00,550 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 17:06:00,551 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 17:06:00,551 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 17:06:00,551 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 17:06:00,551 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 17:06:00,551 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 17:06:00,552 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 17:06:00,552 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 17:06:00,552 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 17:06:00,552 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 17:06:00,552 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 17:06:00,553 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 17:06:00,553 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=SMALLEST; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SMALLEST; [2020-08-18 17:06:00,856 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 17:06:00,870 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 17:06:00,874 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 17:06:00,875 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 17:06:00,876 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 17:06:00,877 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-regression/test24-2.c [2020-08-18 17:06:00,940 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/eac090a88/6140476d9635406682ca2609a7aba3ba/FLAG81ce891c3 [2020-08-18 17:06:01,380 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 17:06:01,381 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/ldv-regression/test24-2.c [2020-08-18 17:06:01,387 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/eac090a88/6140476d9635406682ca2609a7aba3ba/FLAG81ce891c3 [2020-08-18 17:06:01,781 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/eac090a88/6140476d9635406682ca2609a7aba3ba [2020-08-18 17:06:01,792 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 17:06:01,793 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 17:06:01,795 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 17:06:01,795 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 17:06:01,798 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 17:06:01,799 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 05:06:01" (1/1) ... [2020-08-18 17:06:01,803 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4ccc9065 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:06:01, skipping insertion in model container [2020-08-18 17:06:01,803 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 05:06:01" (1/1) ... [2020-08-18 17:06:01,811 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 17:06:01,829 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 17:06:02,020 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 17:06:02,030 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 17:06:02,052 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 17:06:02,160 INFO L208 MainTranslator]: Completed translation [2020-08-18 17:06:02,161 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:06:02 WrapperNode [2020-08-18 17:06:02,161 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 17:06:02,162 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 17:06:02,162 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 17:06:02,162 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 17:06:02,174 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:06:02" (1/1) ... [2020-08-18 17:06:02,174 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:06:02" (1/1) ... [2020-08-18 17:06:02,183 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:06:02" (1/1) ... [2020-08-18 17:06:02,184 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:06:02" (1/1) ... [2020-08-18 17:06:02,199 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:06:02" (1/1) ... [2020-08-18 17:06:02,209 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:06:02" (1/1) ... [2020-08-18 17:06:02,210 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:06:02" (1/1) ... [2020-08-18 17:06:02,212 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 17:06:02,213 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 17:06:02,216 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 17:06:02,216 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 17:06:02,217 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:06:02" (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 17:06:02,275 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 17:06:02,275 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 17:06:02,276 INFO L138 BoogieDeclarations]: Found implementation of procedure check [2020-08-18 17:06:02,276 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 17:06:02,277 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 17:06:02,277 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-18 17:06:02,277 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-08-18 17:06:02,278 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-18 17:06:02,278 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 17:06:02,278 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-18 17:06:02,279 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-18 17:06:02,280 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-18 17:06:02,280 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 17:06:02,280 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 17:06:02,542 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 17:06:02,542 INFO L295 CfgBuilder]: Removed 2 assume(true) statements. [2020-08-18 17:06:02,548 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 05:06:02 BoogieIcfgContainer [2020-08-18 17:06:02,548 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 17:06:02,550 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 17:06:02,550 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 17:06:02,553 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 17:06:02,553 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 05:06:01" (1/3) ... [2020-08-18 17:06:02,554 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@38c34d16 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 05:06:02, skipping insertion in model container [2020-08-18 17:06:02,554 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:06:02" (2/3) ... [2020-08-18 17:06:02,555 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@38c34d16 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 05:06:02, skipping insertion in model container [2020-08-18 17:06:02,555 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 05:06:02" (3/3) ... [2020-08-18 17:06:02,557 INFO L109 eAbstractionObserver]: Analyzing ICFG test24-2.c [2020-08-18 17:06:02,586 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 17:06:02,602 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-18 17:06:02,636 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-18 17:06:02,671 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 17:06:02,672 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 17:06:02,672 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 17:06:02,672 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 17:06:02,672 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 17:06:02,672 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 17:06:02,672 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 17:06:02,673 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 17:06:02,689 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states. [2020-08-18 17:06:02,696 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-18 17:06:02,696 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:06:02,697 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:06:02,697 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:06:02,703 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:06:02,704 INFO L82 PathProgramCache]: Analyzing trace with hash 855240046, now seen corresponding path program 1 times [2020-08-18 17:06:02,711 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:06:02,712 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2108565453] [2020-08-18 17:06:02,712 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:06:02,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:06:02,875 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:06:02,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:06:02,885 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-18 17:06:02,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:06:02,904 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 17:06:02,905 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2108565453] [2020-08-18 17:06:02,907 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 17:06:02,907 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-18 17:06:02,909 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [759137614] [2020-08-18 17:06:02,915 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-18 17:06:02,916 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:06:02,933 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-18 17:06:02,935 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 17:06:02,938 INFO L87 Difference]: Start difference. First operand 25 states. Second operand 3 states. [2020-08-18 17:06:03,043 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:06:03,044 INFO L93 Difference]: Finished difference Result 42 states and 50 transitions. [2020-08-18 17:06:03,044 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-18 17:06:03,046 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2020-08-18 17:06:03,047 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:06:03,059 INFO L225 Difference]: With dead ends: 42 [2020-08-18 17:06:03,060 INFO L226 Difference]: Without dead ends: 20 [2020-08-18 17:06:03,064 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 17:06:03,088 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-18 17:06:03,111 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-18 17:06:03,112 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-18 17:06:03,114 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2020-08-18 17:06:03,115 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 17 [2020-08-18 17:06:03,116 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:06:03,116 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2020-08-18 17:06:03,116 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-18 17:06:03,117 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2020-08-18 17:06:03,117 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-18 17:06:03,118 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:06:03,118 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:06:03,118 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 17:06:03,119 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:06:03,119 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:06:03,119 INFO L82 PathProgramCache]: Analyzing trace with hash -1631497781, now seen corresponding path program 1 times [2020-08-18 17:06:03,120 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:06:03,121 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1580319974] [2020-08-18 17:06:03,121 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:06:03,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:06:03,202 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:06:03,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:06:03,216 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-08-18 17:06:03,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:06:03,241 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 17:06:03,242 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1580319974] [2020-08-18 17:06:03,244 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 17:06:03,245 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 17:06:03,245 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1613414792] [2020-08-18 17:06:03,252 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 17:06:03,253 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:06:03,253 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 17:06:03,253 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 17:06:03,254 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand 4 states. [2020-08-18 17:06:03,351 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:06:03,352 INFO L93 Difference]: Finished difference Result 34 states and 36 transitions. [2020-08-18 17:06:03,352 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-18 17:06:03,353 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 18 [2020-08-18 17:06:03,353 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:06:03,354 INFO L225 Difference]: With dead ends: 34 [2020-08-18 17:06:03,354 INFO L226 Difference]: Without dead ends: 22 [2020-08-18 17:06:03,356 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 17:06:03,356 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-18 17:06:03,369 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2020-08-18 17:06:03,369 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-18 17:06:03,370 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2020-08-18 17:06:03,371 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 18 [2020-08-18 17:06:03,372 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:06:03,372 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2020-08-18 17:06:03,373 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 17:06:03,373 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2020-08-18 17:06:03,374 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-18 17:06:03,375 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:06:03,376 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:06:03,376 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 17:06:03,376 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:06:03,377 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:06:03,377 INFO L82 PathProgramCache]: Analyzing trace with hash 1934775405, now seen corresponding path program 1 times [2020-08-18 17:06:03,378 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:06:03,379 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2136616640] [2020-08-18 17:06:03,379 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:06:03,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:06:03,468 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:06:03,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:06:03,474 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2020-08-18 17:06:03,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:06:03,483 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:06:03,483 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2136616640] [2020-08-18 17:06:03,483 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:06:03,484 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-18 17:06:03,484 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [474822756] [2020-08-18 17:06:03,484 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 17:06:03,485 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:06:03,485 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 17:06:03,485 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-18 17:06:03,486 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 5 states. [2020-08-18 17:06:03,550 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:06:03,551 INFO L93 Difference]: Finished difference Result 36 states and 38 transitions. [2020-08-18 17:06:03,551 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 17:06:03,551 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 20 [2020-08-18 17:06:03,552 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:06:03,552 INFO L225 Difference]: With dead ends: 36 [2020-08-18 17:06:03,552 INFO L226 Difference]: Without dead ends: 24 [2020-08-18 17:06:03,553 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-18 17:06:03,554 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-18 17:06:03,558 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2020-08-18 17:06:03,558 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-18 17:06:03,559 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2020-08-18 17:06:03,559 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 20 [2020-08-18 17:06:03,560 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:06:03,560 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2020-08-18 17:06:03,560 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 17:06:03,560 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2020-08-18 17:06:03,561 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-18 17:06:03,561 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:06:03,561 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:06:03,562 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-18 17:06:03,562 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:06:03,562 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:06:03,562 INFO L82 PathProgramCache]: Analyzing trace with hash 1739404943, now seen corresponding path program 2 times [2020-08-18 17:06:03,563 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:06:03,563 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [56233601] [2020-08-18 17:06:03,563 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:06:03,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:06:03,649 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:06:03,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:06:03,654 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2020-08-18 17:06:03,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:06:03,661 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:06:03,662 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [56233601] [2020-08-18 17:06:03,662 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:06:03,663 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-18 17:06:03,663 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2050881617] [2020-08-18 17:06:03,664 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 17:06:03,664 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:06:03,664 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 17:06:03,665 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-18 17:06:03,665 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand 6 states. [2020-08-18 17:06:03,739 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:06:03,739 INFO L93 Difference]: Finished difference Result 38 states and 40 transitions. [2020-08-18 17:06:03,740 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-18 17:06:03,740 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 22 [2020-08-18 17:06:03,740 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:06:03,741 INFO L225 Difference]: With dead ends: 38 [2020-08-18 17:06:03,741 INFO L226 Difference]: Without dead ends: 26 [2020-08-18 17:06:03,742 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-18 17:06:03,743 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-18 17:06:03,747 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2020-08-18 17:06:03,747 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-18 17:06:03,748 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 26 transitions. [2020-08-18 17:06:03,749 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 26 transitions. Word has length 22 [2020-08-18 17:06:03,749 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:06:03,749 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 26 transitions. [2020-08-18 17:06:03,750 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 17:06:03,750 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 26 transitions. [2020-08-18 17:06:03,751 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-18 17:06:03,751 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:06:03,751 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:06:03,751 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-18 17:06:03,752 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:06:03,752 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:06:03,752 INFO L82 PathProgramCache]: Analyzing trace with hash -1328015311, now seen corresponding path program 3 times [2020-08-18 17:06:03,753 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:06:03,753 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [566332646] [2020-08-18 17:06:03,753 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:06:03,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:06:03,885 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:06:03,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:06:03,895 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2020-08-18 17:06:03,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:06:03,906 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:06:03,907 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [566332646] [2020-08-18 17:06:03,907 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:06:03,907 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-18 17:06:03,907 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1426153543] [2020-08-18 17:06:03,908 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-18 17:06:03,908 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:06:03,908 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-18 17:06:03,909 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-08-18 17:06:03,911 INFO L87 Difference]: Start difference. First operand 25 states and 26 transitions. Second operand 7 states. [2020-08-18 17:06:03,978 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:06:03,979 INFO L93 Difference]: Finished difference Result 40 states and 42 transitions. [2020-08-18 17:06:03,980 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-18 17:06:03,980 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 24 [2020-08-18 17:06:03,980 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:06:03,981 INFO L225 Difference]: With dead ends: 40 [2020-08-18 17:06:03,981 INFO L226 Difference]: Without dead ends: 28 [2020-08-18 17:06:03,982 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-08-18 17:06:03,983 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-18 17:06:03,988 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2020-08-18 17:06:03,989 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-18 17:06:03,989 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2020-08-18 17:06:03,991 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 24 [2020-08-18 17:06:03,991 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:06:03,992 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2020-08-18 17:06:03,992 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-18 17:06:03,992 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2020-08-18 17:06:03,993 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-18 17:06:03,994 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:06:03,994 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:06:03,994 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-18 17:06:03,994 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:06:03,994 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:06:03,995 INFO L82 PathProgramCache]: Analyzing trace with hash 1523652947, now seen corresponding path program 4 times [2020-08-18 17:06:03,995 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:06:03,996 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [680088964] [2020-08-18 17:06:03,996 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:06:04,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:06:04,117 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:06:04,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:06:04,124 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2020-08-18 17:06:04,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:06:04,128 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:06:04,129 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [680088964] [2020-08-18 17:06:04,129 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:06:04,129 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-18 17:06:04,129 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [330443644] [2020-08-18 17:06:04,130 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-18 17:06:04,130 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:06:04,131 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-18 17:06:04,138 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-08-18 17:06:04,138 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 8 states. [2020-08-18 17:06:04,204 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:06:04,204 INFO L93 Difference]: Finished difference Result 42 states and 44 transitions. [2020-08-18 17:06:04,205 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-18 17:06:04,205 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 26 [2020-08-18 17:06:04,205 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:06:04,206 INFO L225 Difference]: With dead ends: 42 [2020-08-18 17:06:04,206 INFO L226 Difference]: Without dead ends: 30 [2020-08-18 17:06:04,207 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-08-18 17:06:04,207 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-18 17:06:04,211 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2020-08-18 17:06:04,212 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-18 17:06:04,212 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 30 transitions. [2020-08-18 17:06:04,213 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 30 transitions. Word has length 26 [2020-08-18 17:06:04,213 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:06:04,213 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 30 transitions. [2020-08-18 17:06:04,213 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-18 17:06:04,213 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 30 transitions. [2020-08-18 17:06:04,214 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-18 17:06:04,214 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:06:04,214 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:06:04,215 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-18 17:06:04,215 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:06:04,215 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:06:04,215 INFO L82 PathProgramCache]: Analyzing trace with hash 1787714037, now seen corresponding path program 5 times [2020-08-18 17:06:04,216 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:06:04,216 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1811935167] [2020-08-18 17:06:04,216 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:06:04,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:06:04,298 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:06:04,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:06:04,301 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2020-08-18 17:06:04,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:06:04,307 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:06:04,307 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1811935167] [2020-08-18 17:06:04,307 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:06:04,308 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-18 17:06:04,308 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1492198017] [2020-08-18 17:06:04,309 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-18 17:06:04,309 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:06:04,309 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-18 17:06:04,309 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2020-08-18 17:06:04,310 INFO L87 Difference]: Start difference. First operand 29 states and 30 transitions. Second operand 9 states. [2020-08-18 17:06:04,389 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:06:04,389 INFO L93 Difference]: Finished difference Result 44 states and 46 transitions. [2020-08-18 17:06:04,389 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-18 17:06:04,389 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 28 [2020-08-18 17:06:04,390 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:06:04,390 INFO L225 Difference]: With dead ends: 44 [2020-08-18 17:06:04,390 INFO L226 Difference]: Without dead ends: 32 [2020-08-18 17:06:04,391 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2020-08-18 17:06:04,391 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-18 17:06:04,395 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2020-08-18 17:06:04,395 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-18 17:06:04,396 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 32 transitions. [2020-08-18 17:06:04,396 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 32 transitions. Word has length 28 [2020-08-18 17:06:04,396 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:06:04,397 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 32 transitions. [2020-08-18 17:06:04,397 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-18 17:06:04,397 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 32 transitions. [2020-08-18 17:06:04,398 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-18 17:06:04,398 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:06:04,398 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:06:04,398 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-18 17:06:04,398 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:06:04,399 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:06:04,399 INFO L82 PathProgramCache]: Analyzing trace with hash 2147351063, now seen corresponding path program 6 times [2020-08-18 17:06:04,399 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:06:04,399 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [995500172] [2020-08-18 17:06:04,400 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:06:04,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:06:04,483 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:06:04,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:06:04,487 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-08-18 17:06:04,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:06:04,491 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:06:04,492 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [995500172] [2020-08-18 17:06:04,492 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:06:04,492 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-18 17:06:04,492 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [855452320] [2020-08-18 17:06:04,493 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-18 17:06:04,493 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:06:04,493 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-18 17:06:04,494 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2020-08-18 17:06:04,494 INFO L87 Difference]: Start difference. First operand 31 states and 32 transitions. Second operand 10 states. [2020-08-18 17:06:04,561 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:06:04,561 INFO L93 Difference]: Finished difference Result 46 states and 48 transitions. [2020-08-18 17:06:04,562 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-18 17:06:04,562 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 30 [2020-08-18 17:06:04,562 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:06:04,563 INFO L225 Difference]: With dead ends: 46 [2020-08-18 17:06:04,563 INFO L226 Difference]: Without dead ends: 34 [2020-08-18 17:06:04,563 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2020-08-18 17:06:04,564 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-18 17:06:04,567 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2020-08-18 17:06:04,568 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-18 17:06:04,569 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2020-08-18 17:06:04,569 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 30 [2020-08-18 17:06:04,569 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:06:04,569 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2020-08-18 17:06:04,569 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-18 17:06:04,570 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2020-08-18 17:06:04,570 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-18 17:06:04,571 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:06:04,571 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:06:04,571 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-18 17:06:04,571 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:06:04,572 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:06:04,572 INFO L82 PathProgramCache]: Analyzing trace with hash -133817927, now seen corresponding path program 7 times [2020-08-18 17:06:04,572 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:06:04,572 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [310083627] [2020-08-18 17:06:04,573 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:06:04,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:06:04,728 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:06:04,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:06:04,731 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2020-08-18 17:06:04,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:06:04,737 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:06:04,738 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [310083627] [2020-08-18 17:06:04,738 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:06:04,738 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-18 17:06:04,738 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [661866199] [2020-08-18 17:06:04,739 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-18 17:06:04,739 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:06:04,740 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-18 17:06:04,740 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2020-08-18 17:06:04,740 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 11 states. [2020-08-18 17:06:04,850 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:06:04,851 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2020-08-18 17:06:04,851 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-18 17:06:04,852 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 32 [2020-08-18 17:06:04,852 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:06:04,853 INFO L225 Difference]: With dead ends: 48 [2020-08-18 17:06:04,853 INFO L226 Difference]: Without dead ends: 36 [2020-08-18 17:06:04,854 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2020-08-18 17:06:04,854 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-18 17:06:04,858 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2020-08-18 17:06:04,859 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-18 17:06:04,859 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 36 transitions. [2020-08-18 17:06:04,860 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 36 transitions. Word has length 32 [2020-08-18 17:06:04,860 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:06:04,860 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 36 transitions. [2020-08-18 17:06:04,860 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-18 17:06:04,860 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 36 transitions. [2020-08-18 17:06:04,861 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-18 17:06:04,861 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:06:04,862 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:06:04,862 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-18 17:06:04,862 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:06:04,862 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:06:04,863 INFO L82 PathProgramCache]: Analyzing trace with hash -1903896357, now seen corresponding path program 8 times [2020-08-18 17:06:04,863 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:06:04,863 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [257758845] [2020-08-18 17:06:04,864 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:06:04,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:06:04,982 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:06:04,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:06:04,985 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2020-08-18 17:06:04,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:06:04,990 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:06:04,990 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [257758845] [2020-08-18 17:06:04,990 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:06:04,991 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-18 17:06:04,991 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [717569384] [2020-08-18 17:06:04,991 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-18 17:06:04,992 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:06:04,992 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-18 17:06:04,992 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2020-08-18 17:06:04,992 INFO L87 Difference]: Start difference. First operand 35 states and 36 transitions. Second operand 12 states. [2020-08-18 17:06:05,076 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:06:05,077 INFO L93 Difference]: Finished difference Result 50 states and 52 transitions. [2020-08-18 17:06:05,077 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-18 17:06:05,077 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 34 [2020-08-18 17:06:05,078 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:06:05,078 INFO L225 Difference]: With dead ends: 50 [2020-08-18 17:06:05,078 INFO L226 Difference]: Without dead ends: 38 [2020-08-18 17:06:05,079 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2020-08-18 17:06:05,080 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-18 17:06:05,086 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2020-08-18 17:06:05,087 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-18 17:06:05,087 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 38 transitions. [2020-08-18 17:06:05,087 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 38 transitions. Word has length 34 [2020-08-18 17:06:05,088 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:06:05,088 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 38 transitions. [2020-08-18 17:06:05,088 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-18 17:06:05,089 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 38 transitions. [2020-08-18 17:06:05,091 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-18 17:06:05,091 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:06:05,091 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:06:05,092 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-18 17:06:05,092 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:06:05,092 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:06:05,092 INFO L82 PathProgramCache]: Analyzing trace with hash -2142218371, now seen corresponding path program 9 times [2020-08-18 17:06:05,092 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:06:05,094 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1822530200] [2020-08-18 17:06:05,094 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:06:05,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:06:05,267 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:06:05,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:06:05,271 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2020-08-18 17:06:05,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:06:05,277 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:06:05,278 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1822530200] [2020-08-18 17:06:05,278 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:06:05,278 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-18 17:06:05,278 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [659704373] [2020-08-18 17:06:05,280 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-18 17:06:05,280 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:06:05,281 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-18 17:06:05,281 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2020-08-18 17:06:05,281 INFO L87 Difference]: Start difference. First operand 37 states and 38 transitions. Second operand 13 states. [2020-08-18 17:06:05,368 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:06:05,368 INFO L93 Difference]: Finished difference Result 52 states and 54 transitions. [2020-08-18 17:06:05,369 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-18 17:06:05,369 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 36 [2020-08-18 17:06:05,369 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:06:05,370 INFO L225 Difference]: With dead ends: 52 [2020-08-18 17:06:05,370 INFO L226 Difference]: Without dead ends: 40 [2020-08-18 17:06:05,372 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2020-08-18 17:06:05,372 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-18 17:06:05,377 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2020-08-18 17:06:05,378 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-18 17:06:05,378 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2020-08-18 17:06:05,379 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 36 [2020-08-18 17:06:05,380 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:06:05,380 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2020-08-18 17:06:05,381 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-18 17:06:05,381 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2020-08-18 17:06:05,382 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-18 17:06:05,382 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:06:05,382 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:06:05,382 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-18 17:06:05,383 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:06:05,383 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:06:05,383 INFO L82 PathProgramCache]: Analyzing trace with hash 758560159, now seen corresponding path program 10 times [2020-08-18 17:06:05,383 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:06:05,384 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2122837918] [2020-08-18 17:06:05,384 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:06:05,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:06:05,553 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:06:05,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:06:05,557 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 31 [2020-08-18 17:06:05,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:06:05,561 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:06:05,561 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2122837918] [2020-08-18 17:06:05,561 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:06:05,561 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-18 17:06:05,562 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [445440482] [2020-08-18 17:06:05,562 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-18 17:06:05,562 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:06:05,563 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-18 17:06:05,563 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2020-08-18 17:06:05,563 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 14 states. [2020-08-18 17:06:05,651 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:06:05,652 INFO L93 Difference]: Finished difference Result 54 states and 56 transitions. [2020-08-18 17:06:05,652 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-18 17:06:05,652 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 38 [2020-08-18 17:06:05,653 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:06:05,653 INFO L225 Difference]: With dead ends: 54 [2020-08-18 17:06:05,653 INFO L226 Difference]: Without dead ends: 42 [2020-08-18 17:06:05,654 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2020-08-18 17:06:05,654 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-18 17:06:05,658 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2020-08-18 17:06:05,658 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-18 17:06:05,659 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 42 transitions. [2020-08-18 17:06:05,659 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 42 transitions. Word has length 38 [2020-08-18 17:06:05,659 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:06:05,659 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 42 transitions. [2020-08-18 17:06:05,659 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-18 17:06:05,660 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 42 transitions. [2020-08-18 17:06:05,660 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-18 17:06:05,660 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:06:05,660 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:06:05,661 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-18 17:06:05,661 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:06:05,661 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:06:05,661 INFO L82 PathProgramCache]: Analyzing trace with hash 972952385, now seen corresponding path program 11 times [2020-08-18 17:06:05,661 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:06:05,662 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1219032497] [2020-08-18 17:06:05,662 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:06:05,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:06:05,818 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:06:05,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:06:05,821 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 33 [2020-08-18 17:06:05,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:06:05,828 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:06:05,828 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1219032497] [2020-08-18 17:06:05,828 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:06:05,829 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-18 17:06:05,829 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [276173877] [2020-08-18 17:06:05,830 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-18 17:06:05,830 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:06:05,831 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-18 17:06:05,831 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2020-08-18 17:06:05,831 INFO L87 Difference]: Start difference. First operand 41 states and 42 transitions. Second operand 15 states. [2020-08-18 17:06:05,915 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:06:05,915 INFO L93 Difference]: Finished difference Result 56 states and 58 transitions. [2020-08-18 17:06:05,916 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-18 17:06:05,916 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 40 [2020-08-18 17:06:05,916 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:06:05,917 INFO L225 Difference]: With dead ends: 56 [2020-08-18 17:06:05,917 INFO L226 Difference]: Without dead ends: 44 [2020-08-18 17:06:05,918 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2020-08-18 17:06:05,919 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-18 17:06:05,925 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2020-08-18 17:06:05,925 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-18 17:06:05,926 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 44 transitions. [2020-08-18 17:06:05,926 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 44 transitions. Word has length 40 [2020-08-18 17:06:05,926 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:06:05,926 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 44 transitions. [2020-08-18 17:06:05,926 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-18 17:06:05,927 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 44 transitions. [2020-08-18 17:06:05,929 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-18 17:06:05,929 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:06:05,930 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:06:05,930 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-18 17:06:05,930 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:06:05,930 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:06:05,930 INFO L82 PathProgramCache]: Analyzing trace with hash 845451363, now seen corresponding path program 12 times [2020-08-18 17:06:05,931 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:06:05,931 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1533569267] [2020-08-18 17:06:05,931 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:06:05,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:06:06,108 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:06:06,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:06:06,110 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 35 [2020-08-18 17:06:06,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:06:06,115 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:06:06,115 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1533569267] [2020-08-18 17:06:06,116 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:06:06,116 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-18 17:06:06,116 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [158303989] [2020-08-18 17:06:06,117 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-18 17:06:06,117 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:06:06,118 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-18 17:06:06,118 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2020-08-18 17:06:06,118 INFO L87 Difference]: Start difference. First operand 43 states and 44 transitions. Second operand 16 states. [2020-08-18 17:06:06,195 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:06:06,196 INFO L93 Difference]: Finished difference Result 58 states and 60 transitions. [2020-08-18 17:06:06,196 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-18 17:06:06,196 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 42 [2020-08-18 17:06:06,196 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:06:06,197 INFO L225 Difference]: With dead ends: 58 [2020-08-18 17:06:06,197 INFO L226 Difference]: Without dead ends: 46 [2020-08-18 17:06:06,198 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2020-08-18 17:06:06,199 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-18 17:06:06,207 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2020-08-18 17:06:06,207 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-18 17:06:06,208 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 46 transitions. [2020-08-18 17:06:06,211 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 46 transitions. Word has length 42 [2020-08-18 17:06:06,211 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:06:06,211 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 46 transitions. [2020-08-18 17:06:06,211 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-18 17:06:06,211 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 46 transitions. [2020-08-18 17:06:06,212 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-18 17:06:06,212 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:06:06,212 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:06:06,212 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-18 17:06:06,212 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:06:06,212 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:06:06,213 INFO L82 PathProgramCache]: Analyzing trace with hash -1423946491, now seen corresponding path program 13 times [2020-08-18 17:06:06,214 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:06:06,214 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [239059207] [2020-08-18 17:06:06,214 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:06:06,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:06:06,422 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:06:06,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:06:06,424 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2020-08-18 17:06:06,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:06:06,429 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:06:06,430 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [239059207] [2020-08-18 17:06:06,430 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:06:06,430 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-18 17:06:06,430 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2050534608] [2020-08-18 17:06:06,431 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-18 17:06:06,431 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:06:06,431 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-18 17:06:06,431 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2020-08-18 17:06:06,431 INFO L87 Difference]: Start difference. First operand 45 states and 46 transitions. Second operand 17 states. [2020-08-18 17:06:06,565 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:06:06,565 INFO L93 Difference]: Finished difference Result 60 states and 62 transitions. [2020-08-18 17:06:06,565 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-18 17:06:06,565 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 44 [2020-08-18 17:06:06,566 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:06:06,566 INFO L225 Difference]: With dead ends: 60 [2020-08-18 17:06:06,566 INFO L226 Difference]: Without dead ends: 48 [2020-08-18 17:06:06,567 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2020-08-18 17:06:06,567 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-18 17:06:06,571 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 47. [2020-08-18 17:06:06,571 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-18 17:06:06,572 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 48 transitions. [2020-08-18 17:06:06,572 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 48 transitions. Word has length 44 [2020-08-18 17:06:06,572 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:06:06,572 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 48 transitions. [2020-08-18 17:06:06,573 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-18 17:06:06,573 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 48 transitions. [2020-08-18 17:06:06,573 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-18 17:06:06,573 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:06:06,574 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:06:06,574 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-18 17:06:06,574 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:06:06,574 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:06:06,574 INFO L82 PathProgramCache]: Analyzing trace with hash -471897817, now seen corresponding path program 14 times [2020-08-18 17:06:06,575 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:06:06,575 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1287413946] [2020-08-18 17:06:06,575 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:06:06,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:06:06,755 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:06:06,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:06:06,758 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 39 [2020-08-18 17:06:06,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:06:06,763 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:06:06,763 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1287413946] [2020-08-18 17:06:06,764 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:06:06,764 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-18 17:06:06,764 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1088291112] [2020-08-18 17:06:06,764 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-18 17:06:06,765 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:06:06,765 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-18 17:06:06,765 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2020-08-18 17:06:06,765 INFO L87 Difference]: Start difference. First operand 47 states and 48 transitions. Second operand 18 states. [2020-08-18 17:06:06,858 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:06:06,859 INFO L93 Difference]: Finished difference Result 62 states and 64 transitions. [2020-08-18 17:06:06,859 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-18 17:06:06,859 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 46 [2020-08-18 17:06:06,860 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:06:06,860 INFO L225 Difference]: With dead ends: 62 [2020-08-18 17:06:06,860 INFO L226 Difference]: Without dead ends: 50 [2020-08-18 17:06:06,861 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2020-08-18 17:06:06,861 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-08-18 17:06:06,866 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 49. [2020-08-18 17:06:06,866 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-18 17:06:06,867 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 50 transitions. [2020-08-18 17:06:06,867 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 50 transitions. Word has length 46 [2020-08-18 17:06:06,868 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:06:06,868 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 50 transitions. [2020-08-18 17:06:06,868 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-18 17:06:06,868 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 50 transitions. [2020-08-18 17:06:06,868 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-18 17:06:06,869 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:06:06,869 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:06:06,869 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-18 17:06:06,869 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:06:06,869 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:06:06,870 INFO L82 PathProgramCache]: Analyzing trace with hash -381156151, now seen corresponding path program 15 times [2020-08-18 17:06:06,870 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:06:06,870 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [240365357] [2020-08-18 17:06:06,870 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:06:06,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:06:07,076 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:06:07,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:06:07,078 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 41 [2020-08-18 17:06:07,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:06:07,083 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:06:07,084 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [240365357] [2020-08-18 17:06:07,084 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:06:07,084 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-18 17:06:07,084 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1955192044] [2020-08-18 17:06:07,085 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-18 17:06:07,085 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:06:07,085 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-18 17:06:07,086 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2020-08-18 17:06:07,086 INFO L87 Difference]: Start difference. First operand 49 states and 50 transitions. Second operand 19 states. [2020-08-18 17:06:07,179 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:06:07,179 INFO L93 Difference]: Finished difference Result 64 states and 66 transitions. [2020-08-18 17:06:07,180 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-18 17:06:07,180 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 48 [2020-08-18 17:06:07,180 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:06:07,181 INFO L225 Difference]: With dead ends: 64 [2020-08-18 17:06:07,181 INFO L226 Difference]: Without dead ends: 52 [2020-08-18 17:06:07,182 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2020-08-18 17:06:07,182 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-18 17:06:07,188 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2020-08-18 17:06:07,188 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-18 17:06:07,191 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 52 transitions. [2020-08-18 17:06:07,192 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 52 transitions. Word has length 48 [2020-08-18 17:06:07,193 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:06:07,193 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 52 transitions. [2020-08-18 17:06:07,193 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-18 17:06:07,193 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 52 transitions. [2020-08-18 17:06:07,194 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-18 17:06:07,194 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:06:07,194 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:06:07,195 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-18 17:06:07,195 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:06:07,195 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:06:07,196 INFO L82 PathProgramCache]: Analyzing trace with hash 922238955, now seen corresponding path program 16 times [2020-08-18 17:06:07,196 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:06:07,196 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1951551396] [2020-08-18 17:06:07,196 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:06:07,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:06:07,472 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:06:07,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:06:07,474 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 43 [2020-08-18 17:06:07,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:06:07,479 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:06:07,480 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1951551396] [2020-08-18 17:06:07,480 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:06:07,480 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-18 17:06:07,480 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1418962730] [2020-08-18 17:06:07,481 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-18 17:06:07,481 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:06:07,481 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-18 17:06:07,482 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2020-08-18 17:06:07,482 INFO L87 Difference]: Start difference. First operand 51 states and 52 transitions. Second operand 20 states. [2020-08-18 17:06:07,584 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:06:07,585 INFO L93 Difference]: Finished difference Result 66 states and 68 transitions. [2020-08-18 17:06:07,585 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-18 17:06:07,585 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 50 [2020-08-18 17:06:07,585 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:06:07,586 INFO L225 Difference]: With dead ends: 66 [2020-08-18 17:06:07,586 INFO L226 Difference]: Without dead ends: 54 [2020-08-18 17:06:07,587 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2020-08-18 17:06:07,587 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-18 17:06:07,590 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2020-08-18 17:06:07,590 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-18 17:06:07,591 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 54 transitions. [2020-08-18 17:06:07,591 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 54 transitions. Word has length 50 [2020-08-18 17:06:07,591 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:06:07,592 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 54 transitions. [2020-08-18 17:06:07,592 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-18 17:06:07,592 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 54 transitions. [2020-08-18 17:06:07,592 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-18 17:06:07,592 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:06:07,593 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:06:07,593 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-18 17:06:07,593 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:06:07,593 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:06:07,593 INFO L82 PathProgramCache]: Analyzing trace with hash -645514611, now seen corresponding path program 17 times [2020-08-18 17:06:07,594 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:06:07,594 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1921795240] [2020-08-18 17:06:07,594 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:06:07,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:06:07,867 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:06:07,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:06:07,870 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 45 [2020-08-18 17:06:07,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:06:07,877 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:06:07,878 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1921795240] [2020-08-18 17:06:07,878 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:06:07,879 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-18 17:06:07,879 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [145071746] [2020-08-18 17:06:07,881 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-18 17:06:07,881 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:06:07,882 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-18 17:06:07,882 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2020-08-18 17:06:07,883 INFO L87 Difference]: Start difference. First operand 53 states and 54 transitions. Second operand 21 states. [2020-08-18 17:06:08,015 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:06:08,015 INFO L93 Difference]: Finished difference Result 68 states and 70 transitions. [2020-08-18 17:06:08,016 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-18 17:06:08,016 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 52 [2020-08-18 17:06:08,017 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:06:08,017 INFO L225 Difference]: With dead ends: 68 [2020-08-18 17:06:08,017 INFO L226 Difference]: Without dead ends: 56 [2020-08-18 17:06:08,018 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2020-08-18 17:06:08,018 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-08-18 17:06:08,024 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2020-08-18 17:06:08,024 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-18 17:06:08,025 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 56 transitions. [2020-08-18 17:06:08,025 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 56 transitions. Word has length 52 [2020-08-18 17:06:08,026 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:06:08,026 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 56 transitions. [2020-08-18 17:06:08,026 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-18 17:06:08,026 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 56 transitions. [2020-08-18 17:06:08,027 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-18 17:06:08,027 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:06:08,027 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:06:08,027 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-18 17:06:08,028 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:06:08,028 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:06:08,028 INFO L82 PathProgramCache]: Analyzing trace with hash 276829359, now seen corresponding path program 18 times [2020-08-18 17:06:08,028 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:06:08,029 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1689426337] [2020-08-18 17:06:08,029 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:06:08,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:06:08,314 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:06:08,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:06:08,316 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 47 [2020-08-18 17:06:08,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:06:08,333 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:06:08,333 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1689426337] [2020-08-18 17:06:08,334 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:06:08,334 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-18 17:06:08,334 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [33001089] [2020-08-18 17:06:08,334 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-18 17:06:08,335 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:06:08,335 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-18 17:06:08,335 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2020-08-18 17:06:08,335 INFO L87 Difference]: Start difference. First operand 55 states and 56 transitions. Second operand 22 states. [2020-08-18 17:06:08,446 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:06:08,446 INFO L93 Difference]: Finished difference Result 70 states and 72 transitions. [2020-08-18 17:06:08,446 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-18 17:06:08,447 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 54 [2020-08-18 17:06:08,447 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:06:08,448 INFO L225 Difference]: With dead ends: 70 [2020-08-18 17:06:08,448 INFO L226 Difference]: Without dead ends: 58 [2020-08-18 17:06:08,449 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2020-08-18 17:06:08,449 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-18 17:06:08,452 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2020-08-18 17:06:08,452 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-18 17:06:08,453 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 58 transitions. [2020-08-18 17:06:08,453 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 58 transitions. Word has length 54 [2020-08-18 17:06:08,453 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:06:08,454 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 58 transitions. [2020-08-18 17:06:08,454 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-18 17:06:08,454 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 58 transitions. [2020-08-18 17:06:08,454 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-18 17:06:08,454 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:06:08,455 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:06:08,455 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-18 17:06:08,455 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:06:08,455 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:06:08,455 INFO L82 PathProgramCache]: Analyzing trace with hash 1886121553, now seen corresponding path program 19 times [2020-08-18 17:06:08,456 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:06:08,456 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1527679065] [2020-08-18 17:06:08,456 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:06:08,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:06:08,748 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:06:08,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:06:08,752 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 49 [2020-08-18 17:06:08,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:06:08,757 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:06:08,758 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1527679065] [2020-08-18 17:06:08,758 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:06:08,758 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-18 17:06:08,758 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1050523267] [2020-08-18 17:06:08,759 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-18 17:06:08,759 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:06:08,759 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-18 17:06:08,760 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2020-08-18 17:06:08,760 INFO L87 Difference]: Start difference. First operand 57 states and 58 transitions. Second operand 23 states. [2020-08-18 17:06:08,885 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:06:08,885 INFO L93 Difference]: Finished difference Result 71 states and 73 transitions. [2020-08-18 17:06:08,886 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-18 17:06:08,886 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 56 [2020-08-18 17:06:08,886 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:06:08,887 INFO L225 Difference]: With dead ends: 71 [2020-08-18 17:06:08,887 INFO L226 Difference]: Without dead ends: 59 [2020-08-18 17:06:08,888 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2020-08-18 17:06:08,889 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-08-18 17:06:08,893 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2020-08-18 17:06:08,893 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-08-18 17:06:08,895 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 60 transitions. [2020-08-18 17:06:08,895 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 60 transitions. Word has length 56 [2020-08-18 17:06:08,896 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:06:08,896 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 60 transitions. [2020-08-18 17:06:08,896 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-18 17:06:08,896 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 60 transitions. [2020-08-18 17:06:08,896 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-08-18 17:06:08,897 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:06:08,897 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:06:08,897 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-18 17:06:08,897 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:06:08,897 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:06:08,898 INFO L82 PathProgramCache]: Analyzing trace with hash -2067273869, now seen corresponding path program 20 times [2020-08-18 17:06:08,898 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:06:08,898 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2020819683] [2020-08-18 17:06:08,898 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:06:09,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-18 17:06:09,017 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-08-18 17:06:09,017 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-18 17:06:09,022 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-18 17:06:09,051 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 18.08 05:06:09 BoogieIcfgContainer [2020-08-18 17:06:09,051 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-18 17:06:09,054 INFO L168 Benchmark]: Toolchain (without parser) took 7260.15 ms. Allocated memory was 140.5 MB in the beginning and 301.5 MB in the end (delta: 161.0 MB). Free memory was 103.3 MB in the beginning and 156.5 MB in the end (delta: -53.2 MB). Peak memory consumption was 107.7 MB. Max. memory is 7.1 GB. [2020-08-18 17:06:09,055 INFO L168 Benchmark]: CDTParser took 0.20 ms. Allocated memory is still 140.5 MB. Free memory was 122.0 MB in the beginning and 121.8 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-08-18 17:06:09,056 INFO L168 Benchmark]: CACSL2BoogieTranslator took 367.25 ms. Allocated memory was 140.5 MB in the beginning and 204.5 MB in the end (delta: 64.0 MB). Free memory was 103.0 MB in the beginning and 183.4 MB in the end (delta: -80.3 MB). Peak memory consumption was 22.3 MB. Max. memory is 7.1 GB. [2020-08-18 17:06:09,056 INFO L168 Benchmark]: Boogie Preprocessor took 50.16 ms. Allocated memory is still 204.5 MB. Free memory was 183.4 MB in the beginning and 181.0 MB in the end (delta: 2.3 MB). Peak memory consumption was 2.3 MB. Max. memory is 7.1 GB. [2020-08-18 17:06:09,057 INFO L168 Benchmark]: RCFGBuilder took 336.05 ms. Allocated memory is still 204.5 MB. Free memory was 181.0 MB in the beginning and 165.1 MB in the end (delta: 15.9 MB). Peak memory consumption was 15.9 MB. Max. memory is 7.1 GB. [2020-08-18 17:06:09,058 INFO L168 Benchmark]: TraceAbstraction took 6501.83 ms. Allocated memory was 204.5 MB in the beginning and 301.5 MB in the end (delta: 97.0 MB). Free memory was 165.1 MB in the beginning and 156.5 MB in the end (delta: 8.7 MB). Peak memory consumption was 105.6 MB. Max. memory is 7.1 GB. [2020-08-18 17:06:09,061 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.20 ms. Allocated memory is still 140.5 MB. Free memory was 122.0 MB in the beginning and 121.8 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 367.25 ms. Allocated memory was 140.5 MB in the beginning and 204.5 MB in the end (delta: 64.0 MB). Free memory was 103.0 MB in the beginning and 183.4 MB in the end (delta: -80.3 MB). Peak memory consumption was 22.3 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 50.16 ms. Allocated memory is still 204.5 MB. Free memory was 183.4 MB in the beginning and 181.0 MB in the end (delta: 2.3 MB). Peak memory consumption was 2.3 MB. Max. memory is 7.1 GB. * RCFGBuilder took 336.05 ms. Allocated memory is still 204.5 MB. Free memory was 181.0 MB in the beginning and 165.1 MB in the end (delta: 15.9 MB). Peak memory consumption was 15.9 MB. Max. memory is 7.1 GB. * TraceAbstraction took 6501.83 ms. Allocated memory was 204.5 MB in the beginning and 301.5 MB in the end (delta: 97.0 MB). Free memory was 165.1 MB in the beginning and 156.5 MB in the end (delta: 8.7 MB). Peak memory consumption was 105.6 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 37]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L15] struct dummy ad1[20], *ad2; [L16] int i, j, *pa; [L17] j=0 [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND FALSE !(j<20) [L21] i = __VERIFIER_nondet_int() [L22] COND TRUE i >= 0 && i < 10 [L23] ad2 = ad1 [L24] ad1[i].a = i [L25] pa = &ad1[i].a [L26] EXPR ad2[i].a [L26] i = ad2[i].a + 10 [L27] EXPR \read(*pa) [L27] COND FALSE !(i < *pa) [L30] CALL, EXPR check(ad1, i) [L10] EXPR ad1[b].a [L10] return ad1[b].a == b; [L30] RET, EXPR check(ad1, i) [L30] COND TRUE !check(ad1, i) [L37] __VERIFIER_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 25 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 6.3s, OverallIterations: 22, TraceHistogramMax: 20, AutomataDifference: 2.0s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 365 SDtfs, 252 SDslu, 1934 SDs, 0 SdLazy, 1339 SolverSat, 72 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.3s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 336 GetRequests, 105 SyntacticMatches, 0 SemanticMatches, 231 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 190 ImplicationChecksByTransitivity, 2.3s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=59occurred in iteration=21, 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, 21 MinimizatonAttempts, 19 StatesRemovedByMinimization, 19 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.5s SatisfiabilityAnalysisTime, 3.1s InterpolantComputationTime, 815 NumberOfCodeBlocks, 815 NumberOfCodeBlocksAsserted, 22 NumberOfCheckSat, 736 ConstructedInterpolants, 0 QuantifiedInterpolants, 69580 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 21 InterpolantComputations, 2 PerfectInterpolantSequences, 0/2470 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...