/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5000 --traceabstraction.additional.smt.options interpolation-heuristic=SHALLOWEST --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/simple_4-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 19:53:00,979 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 19:53:00,982 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 19:53:01,025 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 19:53:01,025 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 19:53:01,036 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 19:53:01,038 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 19:53:01,040 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 19:53:01,044 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 19:53:01,044 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 19:53:01,045 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 19:53:01,047 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 19:53:01,048 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 19:53:01,048 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 19:53:01,052 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 19:53:01,053 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 19:53:01,053 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 19:53:01,057 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 19:53:01,060 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 19:53:01,066 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 19:53:01,070 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 19:53:01,071 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 19:53:01,072 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 19:53:01,073 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 19:53:01,076 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-21 19:53:01,086 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 19:53:01,087 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 19:53:01,088 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 19:53:01,089 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-21 19:53:01,133 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 19:53:01,133 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 19:53:01,135 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 19:53:01,136 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 19:53:01,136 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 19:53:01,136 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 19:53:01,136 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 19:53:01,137 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 19:53:01,137 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 19:53:01,137 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 19:53:01,138 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 19:53:01,138 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 19:53:01,138 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 19:53:01,139 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 19:53:01,139 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 19:53:01,139 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 19:53:01,139 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 19:53:01,140 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 19:53:01,140 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 19:53:01,140 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 19:53:01,140 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 19:53:01,140 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 19:53:01,141 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 19:53:01,141 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 19:53:01,141 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 19:53:01,141 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 19:53:01,141 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 19:53:01,142 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 19:53:01,142 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 19:53:01,142 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SHALLOWEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SHALLOWEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SHALLOWEST;log-additional-information=true; [2020-08-21 19:53:01,438 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 19:53:01,451 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 19:53:01,454 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 19:53:01,456 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 19:53:01,456 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 19:53:01,457 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/simple_4-2.c [2020-08-21 19:53:01,535 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/7b09f9a04/d570b8b6737444fe926ce4a06944dc8d/FLAG643be51ac [2020-08-21 19:53:01,993 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 19:53:01,995 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-acceleration/simple_4-2.c [2020-08-21 19:53:02,002 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/7b09f9a04/d570b8b6737444fe926ce4a06944dc8d/FLAG643be51ac [2020-08-21 19:53:02,379 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/7b09f9a04/d570b8b6737444fe926ce4a06944dc8d [2020-08-21 19:53:02,389 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 19:53:02,391 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 19:53:02,392 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 19:53:02,393 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 19:53:02,396 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 19:53:02,397 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 07:53:02" (1/1) ... [2020-08-21 19:53:02,400 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5b532f3b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:53:02, skipping insertion in model container [2020-08-21 19:53:02,400 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 07:53:02" (1/1) ... [2020-08-21 19:53:02,408 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 19:53:02,424 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 19:53:02,587 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 19:53:02,593 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 19:53:02,608 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 19:53:02,625 INFO L208 MainTranslator]: Completed translation [2020-08-21 19:53:02,626 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:53:02 WrapperNode [2020-08-21 19:53:02,626 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 19:53:02,627 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 19:53:02,627 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 19:53:02,628 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 19:53:02,641 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:53:02" (1/1) ... [2020-08-21 19:53:02,642 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:53:02" (1/1) ... [2020-08-21 19:53:02,646 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:53:02" (1/1) ... [2020-08-21 19:53:02,646 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:53:02" (1/1) ... [2020-08-21 19:53:02,735 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:53:02" (1/1) ... [2020-08-21 19:53:02,739 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:53:02" (1/1) ... [2020-08-21 19:53:02,740 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:53:02" (1/1) ... [2020-08-21 19:53:02,742 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 19:53:02,742 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 19:53:02,742 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 19:53:02,742 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 19:53:02,743 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:53:02" (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 [2020-08-21 19:53:02,806 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 19:53:02,807 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 19:53:02,807 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-21 19:53:02,807 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 19:53:02,807 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 19:53:02,807 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-21 19:53:02,808 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 19:53:02,808 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 19:53:02,808 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 19:53:02,970 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 19:53:02,970 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-21 19:53:02,974 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 07:53:02 BoogieIcfgContainer [2020-08-21 19:53:02,975 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 19:53:02,976 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 19:53:02,976 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 19:53:02,979 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 19:53:02,980 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 07:53:02" (1/3) ... [2020-08-21 19:53:02,980 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1502c4fe and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 07:53:02, skipping insertion in model container [2020-08-21 19:53:02,981 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:53:02" (2/3) ... [2020-08-21 19:53:02,981 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1502c4fe and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 07:53:02, skipping insertion in model container [2020-08-21 19:53:02,981 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 07:53:02" (3/3) ... [2020-08-21 19:53:02,983 INFO L109 eAbstractionObserver]: Analyzing ICFG simple_4-2.c [2020-08-21 19:53:02,991 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 19:53:02,998 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 19:53:03,012 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 19:53:03,037 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 19:53:03,037 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 19:53:03,038 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 19:53:03,038 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 19:53:03,038 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 19:53:03,038 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 19:53:03,038 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 19:53:03,038 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 19:53:03,057 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2020-08-21 19:53:03,063 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-21 19:53:03,063 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:53:03,064 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:53:03,065 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:53:03,070 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:53:03,070 INFO L82 PathProgramCache]: Analyzing trace with hash 1846144830, now seen corresponding path program 1 times [2020-08-21 19:53:03,077 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:53:03,077 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2043328077] [2020-08-21 19:53:03,078 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:53:03,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:03,283 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:53:03,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:03,294 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:53:03,295 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2043328077] [2020-08-21 19:53:03,298 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 19:53:03,299 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-21 19:53:03,300 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1271387543] [2020-08-21 19:53:03,308 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-21 19:53:03,309 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:53:03,329 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-21 19:53:03,330 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 19:53:03,343 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 3 states. [2020-08-21 19:53:03,382 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:53:03,382 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2020-08-21 19:53:03,389 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 19:53:03,391 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-08-21 19:53:03,391 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:53:03,405 INFO L225 Difference]: With dead ends: 29 [2020-08-21 19:53:03,405 INFO L226 Difference]: Without dead ends: 12 [2020-08-21 19:53:03,408 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 19:53:03,426 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2020-08-21 19:53:03,439 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2020-08-21 19:53:03,440 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2020-08-21 19:53:03,441 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2020-08-21 19:53:03,442 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2020-08-21 19:53:03,443 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:53:03,443 INFO L479 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2020-08-21 19:53:03,443 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-21 19:53:03,443 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2020-08-21 19:53:03,446 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-08-21 19:53:03,446 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:53:03,446 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:53:03,447 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 19:53:03,447 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:53:03,447 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:53:03,448 INFO L82 PathProgramCache]: Analyzing trace with hash 1432376145, now seen corresponding path program 1 times [2020-08-21 19:53:03,448 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:53:03,449 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1631105676] [2020-08-21 19:53:03,449 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:53:03,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:03,559 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:53:03,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:03,563 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:53:03,564 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1631105676] [2020-08-21 19:53:03,564 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:53:03,565 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2020-08-21 19:53:03,565 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2103966471] [2020-08-21 19:53:03,566 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 19:53:03,567 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:53:03,567 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 19:53:03,568 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-21 19:53:03,568 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 4 states. [2020-08-21 19:53:03,592 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:53:03,592 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2020-08-21 19:53:03,593 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-21 19:53:03,593 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 11 [2020-08-21 19:53:03,593 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:53:03,594 INFO L225 Difference]: With dead ends: 18 [2020-08-21 19:53:03,594 INFO L226 Difference]: Without dead ends: 13 [2020-08-21 19:53:03,595 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-21 19:53:03,596 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-08-21 19:53:03,599 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-08-21 19:53:03,599 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-08-21 19:53:03,600 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2020-08-21 19:53:03,600 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 11 [2020-08-21 19:53:03,600 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:53:03,601 INFO L479 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2020-08-21 19:53:03,601 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 19:53:03,601 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2020-08-21 19:53:03,601 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-21 19:53:03,601 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:53:03,602 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:53:03,602 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 19:53:03,602 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:53:03,602 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:53:03,603 INFO L82 PathProgramCache]: Analyzing trace with hash 1490448798, now seen corresponding path program 2 times [2020-08-21 19:53:03,603 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:53:03,603 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1887559895] [2020-08-21 19:53:03,604 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:53:03,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:03,684 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:53:03,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:03,688 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:53:03,689 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1887559895] [2020-08-21 19:53:03,689 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:53:03,689 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-21 19:53:03,690 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1406595550] [2020-08-21 19:53:03,690 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 19:53:03,690 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:53:03,691 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 19:53:03,691 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-21 19:53:03,691 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 5 states. [2020-08-21 19:53:03,729 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:53:03,730 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2020-08-21 19:53:03,732 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 19:53:03,733 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 12 [2020-08-21 19:53:03,733 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:53:03,733 INFO L225 Difference]: With dead ends: 19 [2020-08-21 19:53:03,734 INFO L226 Difference]: Without dead ends: 14 [2020-08-21 19:53:03,734 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-21 19:53:03,735 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-08-21 19:53:03,741 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-08-21 19:53:03,741 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-08-21 19:53:03,742 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2020-08-21 19:53:03,742 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2020-08-21 19:53:03,742 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:53:03,743 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2020-08-21 19:53:03,743 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 19:53:03,743 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2020-08-21 19:53:03,743 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-21 19:53:03,744 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:53:03,744 INFO L422 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:53:03,744 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 19:53:03,744 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:53:03,744 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:53:03,745 INFO L82 PathProgramCache]: Analyzing trace with hash -1004266255, now seen corresponding path program 3 times [2020-08-21 19:53:03,745 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:53:03,745 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1226159498] [2020-08-21 19:53:03,746 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:53:03,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:03,862 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:53:03,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:03,866 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:53:03,866 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1226159498] [2020-08-21 19:53:03,867 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:53:03,867 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-21 19:53:03,867 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1480330409] [2020-08-21 19:53:03,868 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 19:53:03,868 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:53:03,868 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 19:53:03,869 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-21 19:53:03,869 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 6 states. [2020-08-21 19:53:03,893 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:53:03,894 INFO L93 Difference]: Finished difference Result 20 states and 20 transitions. [2020-08-21 19:53:03,894 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 19:53:03,894 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 13 [2020-08-21 19:53:03,895 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:53:03,895 INFO L225 Difference]: With dead ends: 20 [2020-08-21 19:53:03,895 INFO L226 Difference]: Without dead ends: 15 [2020-08-21 19:53:03,896 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-21 19:53:03,896 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-21 19:53:03,900 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-21 19:53:03,900 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-21 19:53:03,900 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2020-08-21 19:53:03,901 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 13 [2020-08-21 19:53:03,901 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:53:03,901 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2020-08-21 19:53:03,901 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 19:53:03,901 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2020-08-21 19:53:03,902 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-08-21 19:53:03,902 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:53:03,902 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:53:03,902 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 19:53:03,903 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:53:03,903 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:53:03,903 INFO L82 PathProgramCache]: Analyzing trace with hash -1031021570, now seen corresponding path program 4 times [2020-08-21 19:53:03,903 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:53:03,904 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [611455963] [2020-08-21 19:53:03,904 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:53:03,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:03,998 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:53:03,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:04,001 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:53:04,002 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [611455963] [2020-08-21 19:53:04,002 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:53:04,003 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 19:53:04,003 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2108703859] [2020-08-21 19:53:04,003 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 19:53:04,004 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:53:04,004 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 19:53:04,004 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-08-21 19:53:04,005 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 7 states. [2020-08-21 19:53:04,054 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:53:04,055 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2020-08-21 19:53:04,055 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 19:53:04,056 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 14 [2020-08-21 19:53:04,056 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:53:04,056 INFO L225 Difference]: With dead ends: 21 [2020-08-21 19:53:04,057 INFO L226 Difference]: Without dead ends: 16 [2020-08-21 19:53:04,057 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-08-21 19:53:04,058 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-21 19:53:04,062 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-08-21 19:53:04,062 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-21 19:53:04,063 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2020-08-21 19:53:04,063 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 14 [2020-08-21 19:53:04,063 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:53:04,064 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2020-08-21 19:53:04,064 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 19:53:04,064 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2020-08-21 19:53:04,064 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-21 19:53:04,065 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:53:04,065 INFO L422 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:53:04,065 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 19:53:04,065 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:53:04,066 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:53:04,066 INFO L82 PathProgramCache]: Analyzing trace with hash -1860436335, now seen corresponding path program 5 times [2020-08-21 19:53:04,066 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:53:04,067 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1597273115] [2020-08-21 19:53:04,067 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:53:04,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:04,209 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:53:04,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:04,212 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:53:04,213 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1597273115] [2020-08-21 19:53:04,213 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:53:04,213 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 19:53:04,213 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [759137614] [2020-08-21 19:53:04,214 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 19:53:04,214 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:53:04,214 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 19:53:04,215 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-08-21 19:53:04,215 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 8 states. [2020-08-21 19:53:04,260 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:53:04,260 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2020-08-21 19:53:04,260 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-21 19:53:04,261 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 15 [2020-08-21 19:53:04,261 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:53:04,262 INFO L225 Difference]: With dead ends: 22 [2020-08-21 19:53:04,262 INFO L226 Difference]: Without dead ends: 17 [2020-08-21 19:53:04,262 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-08-21 19:53:04,263 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-21 19:53:04,267 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-21 19:53:04,267 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-21 19:53:04,268 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-08-21 19:53:04,268 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 15 [2020-08-21 19:53:04,268 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:53:04,268 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-08-21 19:53:04,269 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 19:53:04,269 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-08-21 19:53:04,269 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-21 19:53:04,269 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:53:04,269 INFO L422 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:53:04,270 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 19:53:04,270 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:53:04,270 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:53:04,270 INFO L82 PathProgramCache]: Analyzing trace with hash -1802490274, now seen corresponding path program 6 times [2020-08-21 19:53:04,271 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:53:04,271 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [460882068] [2020-08-21 19:53:04,271 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:53:04,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:04,408 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:53:04,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:04,411 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:53:04,412 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [460882068] [2020-08-21 19:53:04,412 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:53:04,412 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 19:53:04,412 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1629744755] [2020-08-21 19:53:04,413 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 19:53:04,413 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:53:04,413 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 19:53:04,414 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-21 19:53:04,414 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 9 states. [2020-08-21 19:53:04,463 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:53:04,463 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2020-08-21 19:53:04,464 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 19:53:04,464 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 16 [2020-08-21 19:53:04,464 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:53:04,465 INFO L225 Difference]: With dead ends: 23 [2020-08-21 19:53:04,465 INFO L226 Difference]: Without dead ends: 18 [2020-08-21 19:53:04,466 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-21 19:53:04,466 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-08-21 19:53:04,470 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-08-21 19:53:04,470 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-21 19:53:04,470 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2020-08-21 19:53:04,471 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 16 [2020-08-21 19:53:04,471 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:53:04,471 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2020-08-21 19:53:04,471 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 19:53:04,471 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2020-08-21 19:53:04,472 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-21 19:53:04,472 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:53:04,472 INFO L422 BasicCegarLoop]: trace histogram [7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:53:04,473 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 19:53:04,473 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:53:04,473 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:53:04,473 INFO L82 PathProgramCache]: Analyzing trace with hash -6162383, now seen corresponding path program 7 times [2020-08-21 19:53:04,473 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:53:04,474 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1080028512] [2020-08-21 19:53:04,474 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:53:04,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:04,652 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:53:04,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:04,658 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:53:04,658 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1080028512] [2020-08-21 19:53:04,659 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:53:04,659 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-21 19:53:04,659 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [406075716] [2020-08-21 19:53:04,660 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 19:53:04,660 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:53:04,660 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 19:53:04,660 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2020-08-21 19:53:04,661 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 10 states. [2020-08-21 19:53:04,726 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:53:04,726 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2020-08-21 19:53:04,728 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 19:53:04,728 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 17 [2020-08-21 19:53:04,728 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:53:04,729 INFO L225 Difference]: With dead ends: 24 [2020-08-21 19:53:04,729 INFO L226 Difference]: Without dead ends: 19 [2020-08-21 19:53:04,729 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2020-08-21 19:53:04,730 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-08-21 19:53:04,735 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-08-21 19:53:04,735 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-08-21 19:53:04,735 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2020-08-21 19:53:04,737 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 17 [2020-08-21 19:53:04,738 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:53:04,738 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2020-08-21 19:53:04,738 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 19:53:04,738 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2020-08-21 19:53:04,740 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-21 19:53:04,740 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:53:04,740 INFO L422 BasicCegarLoop]: trace histogram [8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:53:04,740 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-21 19:53:04,740 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:53:04,741 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:53:04,741 INFO L82 PathProgramCache]: Analyzing trace with hash -154572610, now seen corresponding path program 8 times [2020-08-21 19:53:04,741 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:53:04,741 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [977838476] [2020-08-21 19:53:04,741 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:53:04,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:04,894 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:53:04,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:04,897 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:53:04,897 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [977838476] [2020-08-21 19:53:04,897 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:53:04,897 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-21 19:53:04,898 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1226156307] [2020-08-21 19:53:04,898 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 19:53:04,898 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:53:04,899 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 19:53:04,899 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-08-21 19:53:04,899 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 11 states. [2020-08-21 19:53:04,993 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:53:04,993 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2020-08-21 19:53:04,994 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-21 19:53:04,994 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 18 [2020-08-21 19:53:04,995 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:53:04,996 INFO L225 Difference]: With dead ends: 25 [2020-08-21 19:53:04,996 INFO L226 Difference]: Without dead ends: 20 [2020-08-21 19:53:04,997 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-08-21 19:53:04,997 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-21 19:53:05,002 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-21 19:53:05,002 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-21 19:53:05,003 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2020-08-21 19:53:05,003 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 18 [2020-08-21 19:53:05,003 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:53:05,004 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2020-08-21 19:53:05,004 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 19:53:05,004 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2020-08-21 19:53:05,005 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-21 19:53:05,005 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:53:05,005 INFO L422 BasicCegarLoop]: trace histogram [9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:53:05,005 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-21 19:53:05,005 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:53:05,006 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:53:05,006 INFO L82 PathProgramCache]: Analyzing trace with hash -460322351, now seen corresponding path program 9 times [2020-08-21 19:53:05,006 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:53:05,007 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [357269029] [2020-08-21 19:53:05,010 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:53:05,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:05,215 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:53:05,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:05,219 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:53:05,219 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [357269029] [2020-08-21 19:53:05,219 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:53:05,220 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-21 19:53:05,220 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [790243526] [2020-08-21 19:53:05,220 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-21 19:53:05,221 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:53:05,221 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-21 19:53:05,221 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-08-21 19:53:05,222 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 12 states. [2020-08-21 19:53:05,322 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:53:05,322 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2020-08-21 19:53:05,322 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-21 19:53:05,323 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 19 [2020-08-21 19:53:05,323 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:53:05,323 INFO L225 Difference]: With dead ends: 26 [2020-08-21 19:53:05,324 INFO L226 Difference]: Without dead ends: 21 [2020-08-21 19:53:05,324 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-08-21 19:53:05,325 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-21 19:53:05,328 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-08-21 19:53:05,328 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-21 19:53:05,329 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2020-08-21 19:53:05,329 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 19 [2020-08-21 19:53:05,329 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:53:05,330 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2020-08-21 19:53:05,330 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-21 19:53:05,330 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2020-08-21 19:53:05,330 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-21 19:53:05,331 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:53:05,331 INFO L422 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:53:05,331 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-21 19:53:05,331 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:53:05,331 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:53:05,332 INFO L82 PathProgramCache]: Analyzing trace with hash -1348629730, now seen corresponding path program 10 times [2020-08-21 19:53:05,332 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:53:05,332 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [654370239] [2020-08-21 19:53:05,332 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:53:05,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:05,542 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:53:05,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:05,547 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:53:05,547 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [654370239] [2020-08-21 19:53:05,547 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:53:05,548 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 19:53:05,548 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1602507563] [2020-08-21 19:53:05,548 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 19:53:05,549 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:53:05,549 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 19:53:05,549 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2020-08-21 19:53:05,549 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 13 states. [2020-08-21 19:53:05,661 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:53:05,661 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2020-08-21 19:53:05,663 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-21 19:53:05,663 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 20 [2020-08-21 19:53:05,664 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:53:05,664 INFO L225 Difference]: With dead ends: 27 [2020-08-21 19:53:05,664 INFO L226 Difference]: Without dead ends: 22 [2020-08-21 19:53:05,665 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2020-08-21 19:53:05,668 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-21 19:53:05,673 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2020-08-21 19:53:05,674 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-08-21 19:53:05,675 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2020-08-21 19:53:05,676 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 20 [2020-08-21 19:53:05,677 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:53:05,677 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2020-08-21 19:53:05,677 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 19:53:05,677 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2020-08-21 19:53:05,678 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-08-21 19:53:05,678 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:53:05,678 INFO L422 BasicCegarLoop]: trace histogram [11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:53:05,679 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-21 19:53:05,679 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:53:05,680 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:53:05,680 INFO L82 PathProgramCache]: Analyzing trace with hash 1178612593, now seen corresponding path program 11 times [2020-08-21 19:53:05,680 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:53:05,681 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1116672437] [2020-08-21 19:53:05,681 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:53:05,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:05,922 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:53:05,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:05,928 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:53:05,929 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1116672437] [2020-08-21 19:53:05,929 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:53:05,930 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-21 19:53:05,930 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1391056238] [2020-08-21 19:53:05,930 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-21 19:53:05,931 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:53:05,931 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-21 19:53:05,931 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2020-08-21 19:53:05,933 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 14 states. [2020-08-21 19:53:06,044 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:53:06,044 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2020-08-21 19:53:06,045 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-21 19:53:06,046 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 21 [2020-08-21 19:53:06,046 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:53:06,046 INFO L225 Difference]: With dead ends: 28 [2020-08-21 19:53:06,046 INFO L226 Difference]: Without dead ends: 23 [2020-08-21 19:53:06,047 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2020-08-21 19:53:06,047 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-21 19:53:06,051 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-08-21 19:53:06,052 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-21 19:53:06,054 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2020-08-21 19:53:06,054 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 21 [2020-08-21 19:53:06,054 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:53:06,055 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2020-08-21 19:53:06,056 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-21 19:53:06,056 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2020-08-21 19:53:06,057 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-21 19:53:06,057 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:53:06,057 INFO L422 BasicCegarLoop]: trace histogram [12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:53:06,057 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-21 19:53:06,057 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:53:06,058 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:53:06,058 INFO L82 PathProgramCache]: Analyzing trace with hash -2081254018, now seen corresponding path program 12 times [2020-08-21 19:53:06,058 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:53:06,058 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [994375951] [2020-08-21 19:53:06,058 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:53:06,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:06,312 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:53:06,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:06,315 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:53:06,316 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [994375951] [2020-08-21 19:53:06,316 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:53:06,316 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-21 19:53:06,317 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1982170211] [2020-08-21 19:53:06,317 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-21 19:53:06,317 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:53:06,318 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-21 19:53:06,318 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2020-08-21 19:53:06,318 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 15 states. [2020-08-21 19:53:06,438 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:53:06,438 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2020-08-21 19:53:06,439 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-21 19:53:06,439 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 22 [2020-08-21 19:53:06,439 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:53:06,439 INFO L225 Difference]: With dead ends: 29 [2020-08-21 19:53:06,439 INFO L226 Difference]: Without dead ends: 24 [2020-08-21 19:53:06,440 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2020-08-21 19:53:06,440 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-21 19:53:06,444 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-08-21 19:53:06,444 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-21 19:53:06,444 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2020-08-21 19:53:06,445 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 22 [2020-08-21 19:53:06,445 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:53:06,445 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2020-08-21 19:53:06,445 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-21 19:53:06,445 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2020-08-21 19:53:06,446 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-08-21 19:53:06,446 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:53:06,446 INFO L422 BasicCegarLoop]: trace histogram [13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:53:06,446 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-21 19:53:06,446 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:53:06,447 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:53:06,447 INFO L82 PathProgramCache]: Analyzing trace with hash -57903855, now seen corresponding path program 13 times [2020-08-21 19:53:06,447 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:53:06,447 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [280700984] [2020-08-21 19:53:06,448 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:53:06,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:06,662 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:53:06,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:06,665 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:53:06,665 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [280700984] [2020-08-21 19:53:06,666 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:53:06,666 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-21 19:53:06,666 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [484793077] [2020-08-21 19:53:06,666 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-21 19:53:06,667 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:53:06,667 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-21 19:53:06,667 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2020-08-21 19:53:06,667 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 16 states. [2020-08-21 19:53:06,819 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:53:06,820 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2020-08-21 19:53:06,825 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-21 19:53:06,825 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 23 [2020-08-21 19:53:06,826 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:53:06,826 INFO L225 Difference]: With dead ends: 30 [2020-08-21 19:53:06,826 INFO L226 Difference]: Without dead ends: 25 [2020-08-21 19:53:06,827 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2020-08-21 19:53:06,827 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-21 19:53:06,833 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-08-21 19:53:06,834 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-21 19:53:06,838 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2020-08-21 19:53:06,838 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 23 [2020-08-21 19:53:06,839 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:53:06,839 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2020-08-21 19:53:06,839 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-21 19:53:06,839 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2020-08-21 19:53:06,840 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-21 19:53:06,840 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:53:06,840 INFO L422 BasicCegarLoop]: trace histogram [14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:53:06,840 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-21 19:53:06,841 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:53:06,841 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:53:06,841 INFO L82 PathProgramCache]: Analyzing trace with hash -1758558242, now seen corresponding path program 14 times [2020-08-21 19:53:06,841 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:53:06,841 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [228656042] [2020-08-21 19:53:06,842 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:53:06,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:07,096 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:53:07,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:07,099 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:53:07,099 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [228656042] [2020-08-21 19:53:07,099 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:53:07,100 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-21 19:53:07,100 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1536526152] [2020-08-21 19:53:07,100 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-21 19:53:07,100 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:53:07,101 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-21 19:53:07,101 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2020-08-21 19:53:07,101 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 17 states. [2020-08-21 19:53:07,253 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:53:07,254 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2020-08-21 19:53:07,254 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-21 19:53:07,255 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 24 [2020-08-21 19:53:07,255 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:53:07,256 INFO L225 Difference]: With dead ends: 31 [2020-08-21 19:53:07,256 INFO L226 Difference]: Without dead ends: 26 [2020-08-21 19:53:07,257 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2020-08-21 19:53:07,257 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-21 19:53:07,260 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-08-21 19:53:07,260 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-21 19:53:07,261 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2020-08-21 19:53:07,261 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 24 [2020-08-21 19:53:07,261 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:53:07,261 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2020-08-21 19:53:07,262 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-21 19:53:07,262 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2020-08-21 19:53:07,262 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-21 19:53:07,262 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:53:07,263 INFO L422 BasicCegarLoop]: trace histogram [15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:53:07,263 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-21 19:53:07,263 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:53:07,263 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:53:07,263 INFO L82 PathProgramCache]: Analyzing trace with hash 1355730609, now seen corresponding path program 15 times [2020-08-21 19:53:07,264 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:53:07,264 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1200105921] [2020-08-21 19:53:07,264 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:53:07,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:07,531 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:53:07,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:07,534 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:53:07,535 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1200105921] [2020-08-21 19:53:07,535 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:53:07,535 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-21 19:53:07,535 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [735553511] [2020-08-21 19:53:07,536 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-21 19:53:07,536 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:53:07,536 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-21 19:53:07,536 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2020-08-21 19:53:07,537 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 18 states. [2020-08-21 19:53:07,718 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:53:07,718 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2020-08-21 19:53:07,719 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-21 19:53:07,719 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 25 [2020-08-21 19:53:07,720 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:53:07,720 INFO L225 Difference]: With dead ends: 32 [2020-08-21 19:53:07,720 INFO L226 Difference]: Without dead ends: 27 [2020-08-21 19:53:07,721 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2020-08-21 19:53:07,721 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-08-21 19:53:07,725 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-08-21 19:53:07,725 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-21 19:53:07,725 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2020-08-21 19:53:07,726 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 25 [2020-08-21 19:53:07,726 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:53:07,726 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2020-08-21 19:53:07,726 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-21 19:53:07,726 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2020-08-21 19:53:07,727 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-21 19:53:07,727 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:53:07,727 INFO L422 BasicCegarLoop]: trace histogram [16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:53:07,727 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-21 19:53:07,727 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:53:07,728 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:53:07,728 INFO L82 PathProgramCache]: Analyzing trace with hash -885562818, now seen corresponding path program 16 times [2020-08-21 19:53:07,728 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:53:07,728 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1556069260] [2020-08-21 19:53:07,728 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:53:07,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:08,046 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:53:08,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:08,049 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:53:08,050 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1556069260] [2020-08-21 19:53:08,050 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:53:08,050 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-21 19:53:08,050 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [310083627] [2020-08-21 19:53:08,051 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-21 19:53:08,051 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:53:08,051 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-21 19:53:08,052 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2020-08-21 19:53:08,052 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 19 states. [2020-08-21 19:53:08,259 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:53:08,260 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2020-08-21 19:53:08,262 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-21 19:53:08,262 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 26 [2020-08-21 19:53:08,262 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:53:08,263 INFO L225 Difference]: With dead ends: 33 [2020-08-21 19:53:08,263 INFO L226 Difference]: Without dead ends: 28 [2020-08-21 19:53:08,264 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2020-08-21 19:53:08,264 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-21 19:53:08,267 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-08-21 19:53:08,268 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-21 19:53:08,268 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2020-08-21 19:53:08,268 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 26 [2020-08-21 19:53:08,268 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:53:08,269 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2020-08-21 19:53:08,269 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-21 19:53:08,269 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2020-08-21 19:53:08,270 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-21 19:53:08,270 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:53:08,270 INFO L422 BasicCegarLoop]: trace histogram [17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:53:08,270 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-21 19:53:08,270 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:53:08,270 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:53:08,271 INFO L82 PathProgramCache]: Analyzing trace with hash -1646182319, now seen corresponding path program 17 times [2020-08-21 19:53:08,271 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:53:08,271 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1869105149] [2020-08-21 19:53:08,271 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:53:08,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:08,601 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:53:08,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:08,604 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:53:08,604 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1869105149] [2020-08-21 19:53:08,605 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:53:08,605 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-21 19:53:08,605 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1602050905] [2020-08-21 19:53:08,605 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-21 19:53:08,605 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:53:08,606 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-21 19:53:08,606 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2020-08-21 19:53:08,606 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 20 states. [2020-08-21 19:53:08,839 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:53:08,840 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2020-08-21 19:53:08,840 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-21 19:53:08,840 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 27 [2020-08-21 19:53:08,841 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:53:08,841 INFO L225 Difference]: With dead ends: 34 [2020-08-21 19:53:08,841 INFO L226 Difference]: Without dead ends: 29 [2020-08-21 19:53:08,842 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2020-08-21 19:53:08,842 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-21 19:53:08,846 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-08-21 19:53:08,846 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-21 19:53:08,846 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2020-08-21 19:53:08,846 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 27 [2020-08-21 19:53:08,847 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:53:08,847 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2020-08-21 19:53:08,847 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-21 19:53:08,847 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2020-08-21 19:53:08,848 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-21 19:53:08,848 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:53:08,848 INFO L422 BasicCegarLoop]: trace histogram [18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:53:08,848 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-21 19:53:08,848 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:53:08,849 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:53:08,849 INFO L82 PathProgramCache]: Analyzing trace with hash 544416926, now seen corresponding path program 18 times [2020-08-21 19:53:08,849 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:53:08,849 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [359997541] [2020-08-21 19:53:08,849 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:53:08,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:09,199 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:53:09,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:09,202 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:53:09,202 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [359997541] [2020-08-21 19:53:09,202 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:53:09,202 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-21 19:53:09,203 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1591536039] [2020-08-21 19:53:09,203 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-21 19:53:09,203 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:53:09,203 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-21 19:53:09,204 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=363, Unknown=0, NotChecked=0, Total=420 [2020-08-21 19:53:09,204 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 21 states. [2020-08-21 19:53:09,441 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:53:09,442 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2020-08-21 19:53:09,444 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-21 19:53:09,444 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 28 [2020-08-21 19:53:09,444 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:53:09,445 INFO L225 Difference]: With dead ends: 35 [2020-08-21 19:53:09,445 INFO L226 Difference]: Without dead ends: 30 [2020-08-21 19:53:09,446 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=57, Invalid=363, Unknown=0, NotChecked=0, Total=420 [2020-08-21 19:53:09,446 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-21 19:53:09,451 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-08-21 19:53:09,451 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-08-21 19:53:09,452 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2020-08-21 19:53:09,452 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 28 [2020-08-21 19:53:09,452 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:53:09,453 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2020-08-21 19:53:09,458 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-21 19:53:09,458 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2020-08-21 19:53:09,458 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-08-21 19:53:09,459 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:53:09,459 INFO L422 BasicCegarLoop]: trace histogram [19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:53:09,459 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-21 19:53:09,459 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:53:09,459 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:53:09,462 INFO L82 PathProgramCache]: Analyzing trace with hash -266483215, now seen corresponding path program 19 times [2020-08-21 19:53:09,462 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:53:09,462 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1788695293] [2020-08-21 19:53:09,462 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:53:09,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:09,860 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:53:09,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:09,863 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:53:09,863 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1788695293] [2020-08-21 19:53:09,863 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:53:09,863 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-21 19:53:09,863 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1950688435] [2020-08-21 19:53:09,864 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-21 19:53:09,864 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:53:09,864 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-21 19:53:09,864 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=402, Unknown=0, NotChecked=0, Total=462 [2020-08-21 19:53:09,864 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 22 states. [2020-08-21 19:53:10,151 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:53:10,152 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2020-08-21 19:53:10,159 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-21 19:53:10,159 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 29 [2020-08-21 19:53:10,160 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:53:10,160 INFO L225 Difference]: With dead ends: 36 [2020-08-21 19:53:10,160 INFO L226 Difference]: Without dead ends: 31 [2020-08-21 19:53:10,161 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=60, Invalid=402, Unknown=0, NotChecked=0, Total=462 [2020-08-21 19:53:10,162 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-21 19:53:10,174 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2020-08-21 19:53:10,175 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-21 19:53:10,175 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2020-08-21 19:53:10,175 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 29 [2020-08-21 19:53:10,176 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:53:10,176 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2020-08-21 19:53:10,176 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-21 19:53:10,176 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2020-08-21 19:53:10,176 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-21 19:53:10,177 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:53:10,177 INFO L422 BasicCegarLoop]: trace histogram [20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:53:10,177 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-21 19:53:10,178 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:53:10,178 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:53:10,178 INFO L82 PathProgramCache]: Analyzing trace with hash 365416190, now seen corresponding path program 20 times [2020-08-21 19:53:10,178 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:53:10,178 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [706405938] [2020-08-21 19:53:10,179 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:53:10,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:10,584 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:53:10,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:10,587 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:53:10,587 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [706405938] [2020-08-21 19:53:10,587 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:53:10,588 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-21 19:53:10,588 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [380566339] [2020-08-21 19:53:10,588 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-21 19:53:10,588 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:53:10,589 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-21 19:53:10,589 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2020-08-21 19:53:10,589 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 23 states. [2020-08-21 19:53:10,894 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:53:10,894 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2020-08-21 19:53:10,895 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-21 19:53:10,895 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 30 [2020-08-21 19:53:10,895 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:53:10,896 INFO L225 Difference]: With dead ends: 37 [2020-08-21 19:53:10,896 INFO L226 Difference]: Without dead ends: 32 [2020-08-21 19:53:10,897 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2020-08-21 19:53:10,897 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-21 19:53:10,900 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2020-08-21 19:53:10,900 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-08-21 19:53:10,901 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2020-08-21 19:53:10,901 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 30 [2020-08-21 19:53:10,901 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:53:10,901 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2020-08-21 19:53:10,901 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-21 19:53:10,901 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2020-08-21 19:53:10,902 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-21 19:53:10,902 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:53:10,902 INFO L422 BasicCegarLoop]: trace histogram [21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:53:10,902 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-21 19:53:10,902 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:53:10,903 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:53:10,903 INFO L82 PathProgramCache]: Analyzing trace with hash -1520538735, now seen corresponding path program 21 times [2020-08-21 19:53:10,903 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:53:10,903 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1459378110] [2020-08-21 19:53:10,903 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:53:10,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:11,344 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:53:11,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:11,348 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:53:11,348 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1459378110] [2020-08-21 19:53:11,348 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:53:11,349 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-21 19:53:11,349 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [296724846] [2020-08-21 19:53:11,349 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-21 19:53:11,350 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:53:11,350 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-21 19:53:11,350 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=486, Unknown=0, NotChecked=0, Total=552 [2020-08-21 19:53:11,350 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 24 states. [2020-08-21 19:53:11,675 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:53:11,675 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2020-08-21 19:53:11,677 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-21 19:53:11,678 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 31 [2020-08-21 19:53:11,678 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:53:11,678 INFO L225 Difference]: With dead ends: 38 [2020-08-21 19:53:11,678 INFO L226 Difference]: Without dead ends: 33 [2020-08-21 19:53:11,679 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=66, Invalid=486, Unknown=0, NotChecked=0, Total=552 [2020-08-21 19:53:11,679 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-21 19:53:11,683 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-08-21 19:53:11,684 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-21 19:53:11,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2020-08-21 19:53:11,684 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 31 [2020-08-21 19:53:11,684 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:53:11,685 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2020-08-21 19:53:11,685 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-21 19:53:11,685 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2020-08-21 19:53:11,685 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-21 19:53:11,685 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:53:11,686 INFO L422 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:53:11,686 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-21 19:53:11,686 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:53:11,686 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:53:11,686 INFO L82 PathProgramCache]: Analyzing trace with hash 144400734, now seen corresponding path program 22 times [2020-08-21 19:53:11,687 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:53:11,687 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1668582729] [2020-08-21 19:53:11,687 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:53:11,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:12,183 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:53:12,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:12,186 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:53:12,186 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1668582729] [2020-08-21 19:53:12,186 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:53:12,186 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-21 19:53:12,187 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [181891132] [2020-08-21 19:53:12,187 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-21 19:53:12,187 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:53:12,188 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-21 19:53:12,188 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=531, Unknown=0, NotChecked=0, Total=600 [2020-08-21 19:53:12,188 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 25 states. [2020-08-21 19:53:12,545 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:53:12,545 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2020-08-21 19:53:12,546 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-21 19:53:12,546 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 32 [2020-08-21 19:53:12,546 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:53:12,546 INFO L225 Difference]: With dead ends: 39 [2020-08-21 19:53:12,547 INFO L226 Difference]: Without dead ends: 34 [2020-08-21 19:53:12,547 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=69, Invalid=531, Unknown=0, NotChecked=0, Total=600 [2020-08-21 19:53:12,548 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-21 19:53:12,556 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-08-21 19:53:12,557 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-21 19:53:12,557 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2020-08-21 19:53:12,557 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 32 [2020-08-21 19:53:12,558 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:53:12,558 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2020-08-21 19:53:12,558 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-21 19:53:12,558 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2020-08-21 19:53:12,558 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-21 19:53:12,559 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:53:12,559 INFO L422 BasicCegarLoop]: trace histogram [23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:53:12,559 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-21 19:53:12,559 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:53:12,559 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:53:12,560 INFO L82 PathProgramCache]: Analyzing trace with hash 217916721, now seen corresponding path program 23 times [2020-08-21 19:53:12,560 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:53:12,560 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [819932011] [2020-08-21 19:53:12,560 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:53:12,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:13,071 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:53:13,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:13,075 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:53:13,076 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [819932011] [2020-08-21 19:53:13,076 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:53:13,076 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-21 19:53:13,076 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [406591498] [2020-08-21 19:53:13,076 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-21 19:53:13,076 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:53:13,077 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-21 19:53:13,077 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=578, Unknown=0, NotChecked=0, Total=650 [2020-08-21 19:53:13,077 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand 26 states. [2020-08-21 19:53:13,487 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:53:13,488 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2020-08-21 19:53:13,494 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-21 19:53:13,494 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 33 [2020-08-21 19:53:13,495 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:53:13,495 INFO L225 Difference]: With dead ends: 40 [2020-08-21 19:53:13,495 INFO L226 Difference]: Without dead ends: 35 [2020-08-21 19:53:13,496 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=72, Invalid=578, Unknown=0, NotChecked=0, Total=650 [2020-08-21 19:53:13,496 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-21 19:53:13,500 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-08-21 19:53:13,501 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-21 19:53:13,501 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2020-08-21 19:53:13,502 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 33 [2020-08-21 19:53:13,502 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:53:13,502 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2020-08-21 19:53:13,502 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-21 19:53:13,502 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2020-08-21 19:53:13,503 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-21 19:53:13,503 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:53:13,503 INFO L422 BasicCegarLoop]: trace histogram [24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:53:13,505 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-21 19:53:13,506 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:53:13,507 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:53:13,507 INFO L82 PathProgramCache]: Analyzing trace with hash -1798054978, now seen corresponding path program 24 times [2020-08-21 19:53:13,507 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:53:13,507 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [442098788] [2020-08-21 19:53:13,507 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:53:13,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:14,078 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:53:14,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:14,082 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:53:14,082 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [442098788] [2020-08-21 19:53:14,082 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:53:14,082 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-21 19:53:14,083 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1067228727] [2020-08-21 19:53:14,083 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-21 19:53:14,083 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:53:14,083 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-21 19:53:14,084 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=627, Unknown=0, NotChecked=0, Total=702 [2020-08-21 19:53:14,084 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 27 states. [2020-08-21 19:53:14,477 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:53:14,478 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2020-08-21 19:53:14,478 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-21 19:53:14,478 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 34 [2020-08-21 19:53:14,479 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:53:14,479 INFO L225 Difference]: With dead ends: 41 [2020-08-21 19:53:14,479 INFO L226 Difference]: Without dead ends: 36 [2020-08-21 19:53:14,480 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=75, Invalid=627, Unknown=0, NotChecked=0, Total=702 [2020-08-21 19:53:14,481 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-21 19:53:14,484 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-08-21 19:53:14,485 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-21 19:53:14,485 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2020-08-21 19:53:14,485 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 34 [2020-08-21 19:53:14,486 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:53:14,486 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2020-08-21 19:53:14,487 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-21 19:53:14,487 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2020-08-21 19:53:14,487 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-08-21 19:53:14,488 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:53:14,488 INFO L422 BasicCegarLoop]: trace histogram [25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:53:14,488 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-21 19:53:14,488 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:53:14,489 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:53:14,489 INFO L82 PathProgramCache]: Analyzing trace with hash 131331793, now seen corresponding path program 25 times [2020-08-21 19:53:14,489 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:53:14,490 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1366068512] [2020-08-21 19:53:14,490 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:53:14,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:15,106 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:53:15,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:15,110 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:53:15,110 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1366068512] [2020-08-21 19:53:15,111 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:53:15,111 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-21 19:53:15,111 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [223156215] [2020-08-21 19:53:15,113 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-21 19:53:15,113 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:53:15,113 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-21 19:53:15,115 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=678, Unknown=0, NotChecked=0, Total=756 [2020-08-21 19:53:15,116 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 28 states. [2020-08-21 19:53:15,578 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:53:15,578 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2020-08-21 19:53:15,579 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-21 19:53:15,579 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 35 [2020-08-21 19:53:15,579 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:53:15,580 INFO L225 Difference]: With dead ends: 42 [2020-08-21 19:53:15,580 INFO L226 Difference]: Without dead ends: 37 [2020-08-21 19:53:15,580 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=78, Invalid=678, Unknown=0, NotChecked=0, Total=756 [2020-08-21 19:53:15,581 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-21 19:53:15,583 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-08-21 19:53:15,586 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-21 19:53:15,586 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2020-08-21 19:53:15,587 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 35 [2020-08-21 19:53:15,587 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:53:15,587 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2020-08-21 19:53:15,587 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-21 19:53:15,587 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2020-08-21 19:53:15,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-21 19:53:15,589 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:53:15,589 INFO L422 BasicCegarLoop]: trace histogram [26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:53:15,590 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-21 19:53:15,590 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:53:15,590 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:53:15,590 INFO L82 PathProgramCache]: Analyzing trace with hash -187220450, now seen corresponding path program 26 times [2020-08-21 19:53:15,590 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:53:15,591 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1459895101] [2020-08-21 19:53:15,592 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:53:15,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:16,200 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:53:16,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:16,204 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:53:16,205 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1459895101] [2020-08-21 19:53:16,205 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:53:16,205 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-21 19:53:16,205 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [215895551] [2020-08-21 19:53:16,205 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-21 19:53:16,206 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:53:16,206 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-21 19:53:16,206 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=731, Unknown=0, NotChecked=0, Total=812 [2020-08-21 19:53:16,206 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 29 states. [2020-08-21 19:53:16,689 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:53:16,689 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2020-08-21 19:53:16,692 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-21 19:53:16,692 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 36 [2020-08-21 19:53:16,692 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:53:16,693 INFO L225 Difference]: With dead ends: 43 [2020-08-21 19:53:16,693 INFO L226 Difference]: Without dead ends: 38 [2020-08-21 19:53:16,693 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=81, Invalid=731, Unknown=0, NotChecked=0, Total=812 [2020-08-21 19:53:16,694 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-21 19:53:16,697 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-08-21 19:53:16,697 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-21 19:53:16,698 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2020-08-21 19:53:16,698 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 36 [2020-08-21 19:53:16,698 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:53:16,698 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2020-08-21 19:53:16,698 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-21 19:53:16,699 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2020-08-21 19:53:16,699 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-21 19:53:16,699 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:53:16,699 INFO L422 BasicCegarLoop]: trace histogram [27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:53:16,699 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-21 19:53:16,700 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:53:16,700 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:53:16,700 INFO L82 PathProgramCache]: Analyzing trace with hash -1472405391, now seen corresponding path program 27 times [2020-08-21 19:53:16,700 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:53:16,700 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1522297876] [2020-08-21 19:53:16,700 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:53:16,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:17,340 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:53:17,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:17,345 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:53:17,345 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1522297876] [2020-08-21 19:53:17,345 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:53:17,345 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-21 19:53:17,346 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1845821312] [2020-08-21 19:53:17,346 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-21 19:53:17,346 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:53:17,346 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-21 19:53:17,347 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=786, Unknown=0, NotChecked=0, Total=870 [2020-08-21 19:53:17,347 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 30 states. [2020-08-21 19:53:17,877 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:53:17,877 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2020-08-21 19:53:17,878 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-21 19:53:17,878 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 37 [2020-08-21 19:53:17,878 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:53:17,879 INFO L225 Difference]: With dead ends: 44 [2020-08-21 19:53:17,879 INFO L226 Difference]: Without dead ends: 39 [2020-08-21 19:53:17,880 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=84, Invalid=786, Unknown=0, NotChecked=0, Total=870 [2020-08-21 19:53:17,880 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-21 19:53:17,884 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-08-21 19:53:17,884 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-21 19:53:17,884 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2020-08-21 19:53:17,884 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 37 [2020-08-21 19:53:17,885 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:53:17,885 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2020-08-21 19:53:17,885 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-21 19:53:17,885 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2020-08-21 19:53:17,885 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-21 19:53:17,885 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:53:17,885 INFO L422 BasicCegarLoop]: trace histogram [28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:53:17,886 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-21 19:53:17,886 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:53:17,886 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:53:17,886 INFO L82 PathProgramCache]: Analyzing trace with hash 1636534398, now seen corresponding path program 28 times [2020-08-21 19:53:17,886 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:53:17,886 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [357440984] [2020-08-21 19:53:17,886 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:53:17,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:18,589 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:53:18,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:18,593 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:53:18,594 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [357440984] [2020-08-21 19:53:18,594 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:53:18,594 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-21 19:53:18,594 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [730978700] [2020-08-21 19:53:18,594 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-21 19:53:18,595 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:53:18,595 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-21 19:53:18,595 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=843, Unknown=0, NotChecked=0, Total=930 [2020-08-21 19:53:18,596 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 31 states. [2020-08-21 19:53:19,171 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:53:19,171 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2020-08-21 19:53:19,172 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-21 19:53:19,172 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 38 [2020-08-21 19:53:19,172 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:53:19,173 INFO L225 Difference]: With dead ends: 45 [2020-08-21 19:53:19,173 INFO L226 Difference]: Without dead ends: 40 [2020-08-21 19:53:19,174 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=87, Invalid=843, Unknown=0, NotChecked=0, Total=930 [2020-08-21 19:53:19,174 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-21 19:53:19,177 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2020-08-21 19:53:19,178 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-21 19:53:19,178 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 40 transitions. [2020-08-21 19:53:19,178 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 40 transitions. Word has length 38 [2020-08-21 19:53:19,178 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:53:19,178 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 40 transitions. [2020-08-21 19:53:19,179 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-21 19:53:19,179 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 40 transitions. [2020-08-21 19:53:19,179 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-21 19:53:19,179 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:53:19,179 INFO L422 BasicCegarLoop]: trace histogram [29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:53:19,180 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-21 19:53:19,180 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:53:19,180 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:53:19,180 INFO L82 PathProgramCache]: Analyzing trace with hash -770579951, now seen corresponding path program 29 times [2020-08-21 19:53:19,180 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:53:19,181 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1785541898] [2020-08-21 19:53:19,181 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:53:19,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:19,960 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:53:19,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:19,964 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:53:19,964 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1785541898] [2020-08-21 19:53:19,964 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:53:19,964 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-21 19:53:19,965 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1117306668] [2020-08-21 19:53:19,965 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-21 19:53:19,965 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:53:19,965 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-21 19:53:19,966 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=902, Unknown=0, NotChecked=0, Total=992 [2020-08-21 19:53:19,966 INFO L87 Difference]: Start difference. First operand 40 states and 40 transitions. Second operand 32 states. [2020-08-21 19:53:20,550 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:53:20,550 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2020-08-21 19:53:20,551 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-21 19:53:20,551 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 39 [2020-08-21 19:53:20,551 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:53:20,552 INFO L225 Difference]: With dead ends: 46 [2020-08-21 19:53:20,552 INFO L226 Difference]: Without dead ends: 41 [2020-08-21 19:53:20,553 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=90, Invalid=902, Unknown=0, NotChecked=0, Total=992 [2020-08-21 19:53:20,553 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-21 19:53:20,560 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-08-21 19:53:20,561 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-21 19:53:20,561 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2020-08-21 19:53:20,561 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 39 [2020-08-21 19:53:20,561 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:53:20,561 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2020-08-21 19:53:20,562 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-21 19:53:20,562 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2020-08-21 19:53:20,562 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-21 19:53:20,562 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:53:20,562 INFO L422 BasicCegarLoop]: trace histogram [30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:53:20,563 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-21 19:53:20,563 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:53:20,563 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:53:20,563 INFO L82 PathProgramCache]: Analyzing trace with hash 1918286558, now seen corresponding path program 30 times [2020-08-21 19:53:20,563 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:53:20,563 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1910521654] [2020-08-21 19:53:20,564 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:53:20,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:21,345 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:53:21,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:21,350 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:53:21,350 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1910521654] [2020-08-21 19:53:21,350 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:53:21,350 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-21 19:53:21,350 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [25363983] [2020-08-21 19:53:21,351 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-21 19:53:21,351 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:53:21,351 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-21 19:53:21,351 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=963, Unknown=0, NotChecked=0, Total=1056 [2020-08-21 19:53:21,351 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 33 states. [2020-08-21 19:53:21,970 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:53:21,970 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2020-08-21 19:53:21,972 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-21 19:53:21,972 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 40 [2020-08-21 19:53:21,972 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:53:21,972 INFO L225 Difference]: With dead ends: 47 [2020-08-21 19:53:21,972 INFO L226 Difference]: Without dead ends: 42 [2020-08-21 19:53:21,973 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=93, Invalid=963, Unknown=0, NotChecked=0, Total=1056 [2020-08-21 19:53:21,973 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-21 19:53:21,976 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-08-21 19:53:21,976 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-21 19:53:21,977 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2020-08-21 19:53:21,977 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 40 [2020-08-21 19:53:21,977 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:53:21,977 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2020-08-21 19:53:21,977 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-21 19:53:21,978 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2020-08-21 19:53:21,978 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-21 19:53:21,978 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:53:21,978 INFO L422 BasicCegarLoop]: trace histogram [31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:53:21,978 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-21 19:53:21,978 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:53:21,979 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:53:21,979 INFO L82 PathProgramCache]: Analyzing trace with hash -626197583, now seen corresponding path program 31 times [2020-08-21 19:53:21,979 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:53:21,979 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [145061390] [2020-08-21 19:53:21,979 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:53:21,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:22,780 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:53:22,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:22,785 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:53:22,785 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [145061390] [2020-08-21 19:53:22,785 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:53:22,785 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-21 19:53:22,785 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1460585290] [2020-08-21 19:53:22,786 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-21 19:53:22,786 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:53:22,786 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-21 19:53:22,786 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=1026, Unknown=0, NotChecked=0, Total=1122 [2020-08-21 19:53:22,786 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand 34 states. [2020-08-21 19:53:23,468 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:53:23,469 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2020-08-21 19:53:23,470 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-21 19:53:23,470 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 41 [2020-08-21 19:53:23,471 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:53:23,471 INFO L225 Difference]: With dead ends: 48 [2020-08-21 19:53:23,471 INFO L226 Difference]: Without dead ends: 43 [2020-08-21 19:53:23,472 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=96, Invalid=1026, Unknown=0, NotChecked=0, Total=1122 [2020-08-21 19:53:23,473 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-21 19:53:23,475 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-08-21 19:53:23,476 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-21 19:53:23,476 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2020-08-21 19:53:23,476 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 41 [2020-08-21 19:53:23,476 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:53:23,477 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2020-08-21 19:53:23,477 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-21 19:53:23,477 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2020-08-21 19:53:23,477 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-21 19:53:23,477 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:53:23,477 INFO L422 BasicCegarLoop]: trace histogram [32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:53:23,478 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-21 19:53:23,478 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:53:23,478 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:53:23,478 INFO L82 PathProgramCache]: Analyzing trace with hash 2099172670, now seen corresponding path program 32 times [2020-08-21 19:53:23,478 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:53:23,478 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1609176580] [2020-08-21 19:53:23,479 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:53:23,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:24,349 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:53:24,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:24,353 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:53:24,353 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1609176580] [2020-08-21 19:53:24,353 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:53:24,354 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-21 19:53:24,354 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [130326110] [2020-08-21 19:53:24,354 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-21 19:53:24,354 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:53:24,354 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-21 19:53:24,355 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=1091, Unknown=0, NotChecked=0, Total=1190 [2020-08-21 19:53:24,355 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 35 states. [2020-08-21 19:53:25,071 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:53:25,071 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2020-08-21 19:53:25,071 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-21 19:53:25,072 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 42 [2020-08-21 19:53:25,072 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:53:25,072 INFO L225 Difference]: With dead ends: 49 [2020-08-21 19:53:25,073 INFO L226 Difference]: Without dead ends: 44 [2020-08-21 19:53:25,074 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=99, Invalid=1091, Unknown=0, NotChecked=0, Total=1190 [2020-08-21 19:53:25,074 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-21 19:53:25,077 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-08-21 19:53:25,077 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-21 19:53:25,077 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2020-08-21 19:53:25,078 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 42 [2020-08-21 19:53:25,078 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:53:25,078 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2020-08-21 19:53:25,078 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-21 19:53:25,078 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2020-08-21 19:53:25,079 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-21 19:53:25,079 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:53:25,079 INFO L422 BasicCegarLoop]: trace histogram [33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:53:25,079 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-21 19:53:25,079 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:53:25,079 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:53:25,080 INFO L82 PathProgramCache]: Analyzing trace with hash 686304593, now seen corresponding path program 33 times [2020-08-21 19:53:25,080 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:53:25,080 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [91663722] [2020-08-21 19:53:25,080 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:53:25,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:26,002 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:53:26,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:26,008 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:53:26,009 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [91663722] [2020-08-21 19:53:26,009 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:53:26,009 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-21 19:53:26,009 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [167230977] [2020-08-21 19:53:26,010 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-21 19:53:26,010 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:53:26,010 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-21 19:53:26,011 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=1158, Unknown=0, NotChecked=0, Total=1260 [2020-08-21 19:53:26,011 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 36 states. [2020-08-21 19:53:26,769 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:53:26,770 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2020-08-21 19:53:26,770 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-21 19:53:26,770 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 43 [2020-08-21 19:53:26,771 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:53:26,771 INFO L225 Difference]: With dead ends: 50 [2020-08-21 19:53:26,771 INFO L226 Difference]: Without dead ends: 45 [2020-08-21 19:53:26,772 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=102, Invalid=1158, Unknown=0, NotChecked=0, Total=1260 [2020-08-21 19:53:26,772 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-08-21 19:53:26,775 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2020-08-21 19:53:26,775 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-21 19:53:26,776 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2020-08-21 19:53:26,776 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 43 [2020-08-21 19:53:26,776 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:53:26,776 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2020-08-21 19:53:26,776 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-21 19:53:26,776 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2020-08-21 19:53:26,777 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-21 19:53:26,777 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:53:26,777 INFO L422 BasicCegarLoop]: trace histogram [34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:53:26,777 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-21 19:53:26,777 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:53:26,778 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:53:26,778 INFO L82 PathProgramCache]: Analyzing trace with hash -162932834, now seen corresponding path program 34 times [2020-08-21 19:53:26,778 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:53:26,778 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [93263127] [2020-08-21 19:53:26,778 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:53:26,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:27,791 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:53:27,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:27,797 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:53:27,797 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [93263127] [2020-08-21 19:53:27,797 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:53:27,797 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-21 19:53:27,797 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [933672262] [2020-08-21 19:53:27,798 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-21 19:53:27,798 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:53:27,798 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-21 19:53:27,799 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=1227, Unknown=0, NotChecked=0, Total=1332 [2020-08-21 19:53:27,799 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 37 states. [2020-08-21 19:53:28,592 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:53:28,592 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2020-08-21 19:53:28,593 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-21 19:53:28,593 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 44 [2020-08-21 19:53:28,593 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:53:28,594 INFO L225 Difference]: With dead ends: 51 [2020-08-21 19:53:28,594 INFO L226 Difference]: Without dead ends: 46 [2020-08-21 19:53:28,594 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=105, Invalid=1227, Unknown=0, NotChecked=0, Total=1332 [2020-08-21 19:53:28,595 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-21 19:53:28,597 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2020-08-21 19:53:28,598 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-21 19:53:28,600 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 46 transitions. [2020-08-21 19:53:28,600 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 46 transitions. Word has length 44 [2020-08-21 19:53:28,600 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:53:28,601 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 46 transitions. [2020-08-21 19:53:28,601 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-21 19:53:28,601 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 46 transitions. [2020-08-21 19:53:28,601 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-08-21 19:53:28,601 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:53:28,602 INFO L422 BasicCegarLoop]: trace histogram [35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:53:28,602 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-21 19:53:28,602 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:53:28,602 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:53:28,602 INFO L82 PathProgramCache]: Analyzing trace with hash -719489295, now seen corresponding path program 35 times [2020-08-21 19:53:28,602 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:53:28,603 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [254396103] [2020-08-21 19:53:28,603 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:53:28,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:29,668 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:53:29,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:29,673 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:53:29,673 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [254396103] [2020-08-21 19:53:29,674 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:53:29,674 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-21 19:53:29,674 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1844113230] [2020-08-21 19:53:29,674 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-21 19:53:29,674 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:53:29,675 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-21 19:53:29,675 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=1298, Unknown=0, NotChecked=0, Total=1406 [2020-08-21 19:53:29,675 INFO L87 Difference]: Start difference. First operand 46 states and 46 transitions. Second operand 38 states. [2020-08-21 19:53:30,490 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:53:30,490 INFO L93 Difference]: Finished difference Result 52 states and 52 transitions. [2020-08-21 19:53:30,490 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-21 19:53:30,491 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 45 [2020-08-21 19:53:30,491 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:53:30,492 INFO L225 Difference]: With dead ends: 52 [2020-08-21 19:53:30,492 INFO L226 Difference]: Without dead ends: 47 [2020-08-21 19:53:30,493 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=108, Invalid=1298, Unknown=0, NotChecked=0, Total=1406 [2020-08-21 19:53:30,493 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-21 19:53:30,496 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2020-08-21 19:53:30,496 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-21 19:53:30,497 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2020-08-21 19:53:30,497 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 45 [2020-08-21 19:53:30,497 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:53:30,497 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2020-08-21 19:53:30,497 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-21 19:53:30,497 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2020-08-21 19:53:30,498 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-21 19:53:30,498 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:53:30,498 INFO L422 BasicCegarLoop]: trace histogram [36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:53:30,498 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-21 19:53:30,498 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:53:30,499 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:53:30,499 INFO L82 PathProgramCache]: Analyzing trace with hash -792870402, now seen corresponding path program 36 times [2020-08-21 19:53:30,499 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:53:30,499 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1688104037] [2020-08-21 19:53:30,499 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:53:30,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:31,624 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:53:31,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:31,629 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:53:31,629 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1688104037] [2020-08-21 19:53:31,629 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:53:31,630 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-21 19:53:31,630 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1244948618] [2020-08-21 19:53:31,630 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-21 19:53:31,630 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:53:31,630 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-21 19:53:31,631 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=1371, Unknown=0, NotChecked=0, Total=1482 [2020-08-21 19:53:31,631 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 39 states. [2020-08-21 19:53:32,533 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:53:32,533 INFO L93 Difference]: Finished difference Result 53 states and 53 transitions. [2020-08-21 19:53:32,534 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-21 19:53:32,535 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 46 [2020-08-21 19:53:32,535 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:53:32,535 INFO L225 Difference]: With dead ends: 53 [2020-08-21 19:53:32,535 INFO L226 Difference]: Without dead ends: 48 [2020-08-21 19:53:32,536 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=111, Invalid=1371, Unknown=0, NotChecked=0, Total=1482 [2020-08-21 19:53:32,536 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-21 19:53:32,539 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-08-21 19:53:32,539 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-21 19:53:32,539 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 48 transitions. [2020-08-21 19:53:32,539 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 48 transitions. Word has length 46 [2020-08-21 19:53:32,539 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:53:32,540 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 48 transitions. [2020-08-21 19:53:32,540 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-21 19:53:32,540 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 48 transitions. [2020-08-21 19:53:32,540 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-08-21 19:53:32,540 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:53:32,540 INFO L422 BasicCegarLoop]: trace histogram [37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:53:32,540 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-21 19:53:32,540 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:53:32,541 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:53:32,541 INFO L82 PathProgramCache]: Analyzing trace with hash 1227282577, now seen corresponding path program 37 times [2020-08-21 19:53:32,541 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:53:32,541 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [705196039] [2020-08-21 19:53:32,541 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:53:32,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:33,696 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:53:33,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:33,702 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:53:33,702 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [705196039] [2020-08-21 19:53:33,702 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:53:33,702 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-21 19:53:33,703 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [183123010] [2020-08-21 19:53:33,703 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-21 19:53:33,703 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:53:33,703 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-21 19:53:33,704 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=1446, Unknown=0, NotChecked=0, Total=1560 [2020-08-21 19:53:33,704 INFO L87 Difference]: Start difference. First operand 48 states and 48 transitions. Second operand 40 states. [2020-08-21 19:53:34,679 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:53:34,679 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2020-08-21 19:53:34,680 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-21 19:53:34,680 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 47 [2020-08-21 19:53:34,680 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:53:34,681 INFO L225 Difference]: With dead ends: 54 [2020-08-21 19:53:34,681 INFO L226 Difference]: Without dead ends: 49 [2020-08-21 19:53:34,682 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=114, Invalid=1446, Unknown=0, NotChecked=0, Total=1560 [2020-08-21 19:53:34,682 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-21 19:53:34,686 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-21 19:53:34,686 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-21 19:53:34,686 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2020-08-21 19:53:34,687 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 47 [2020-08-21 19:53:34,687 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:53:34,687 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2020-08-21 19:53:34,687 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-21 19:53:34,687 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2020-08-21 19:53:34,688 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-21 19:53:34,688 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:53:34,688 INFO L422 BasicCegarLoop]: trace histogram [38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:53:34,688 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-21 19:53:34,688 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:53:34,688 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:53:34,689 INFO L82 PathProgramCache]: Analyzing trace with hash -572484514, now seen corresponding path program 38 times [2020-08-21 19:53:34,689 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:53:34,689 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2105594701] [2020-08-21 19:53:34,689 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:53:34,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:35,876 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:53:35,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:35,881 INFO L134 CoverageAnalysis]: Checked inductivity of 741 backedges. 0 proven. 741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:53:35,881 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2105594701] [2020-08-21 19:53:35,881 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:53:35,881 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-21 19:53:35,882 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1479019462] [2020-08-21 19:53:35,882 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-21 19:53:35,882 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:53:35,882 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-21 19:53:35,883 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=1523, Unknown=0, NotChecked=0, Total=1640 [2020-08-21 19:53:35,883 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand 41 states. [2020-08-21 19:53:36,917 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:53:36,918 INFO L93 Difference]: Finished difference Result 55 states and 55 transitions. [2020-08-21 19:53:36,918 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-21 19:53:36,918 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 48 [2020-08-21 19:53:36,919 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:53:36,919 INFO L225 Difference]: With dead ends: 55 [2020-08-21 19:53:36,919 INFO L226 Difference]: Without dead ends: 50 [2020-08-21 19:53:36,920 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=117, Invalid=1523, Unknown=0, NotChecked=0, Total=1640 [2020-08-21 19:53:36,921 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-08-21 19:53:36,923 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2020-08-21 19:53:36,923 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-08-21 19:53:36,924 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 50 transitions. [2020-08-21 19:53:36,924 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 50 transitions. Word has length 48 [2020-08-21 19:53:36,924 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:53:36,924 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 50 transitions. [2020-08-21 19:53:36,925 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-21 19:53:36,925 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 50 transitions. [2020-08-21 19:53:36,925 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-08-21 19:53:36,925 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:53:36,925 INFO L422 BasicCegarLoop]: trace histogram [39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:53:36,926 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-21 19:53:36,926 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:53:36,926 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:53:36,926 INFO L82 PathProgramCache]: Analyzing trace with hash -530689487, now seen corresponding path program 39 times [2020-08-21 19:53:36,926 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:53:36,926 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [677388741] [2020-08-21 19:53:36,927 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:53:36,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:38,146 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:53:38,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:38,153 INFO L134 CoverageAnalysis]: Checked inductivity of 780 backedges. 0 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:53:38,153 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [677388741] [2020-08-21 19:53:38,153 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:53:38,153 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-21 19:53:38,154 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [16117315] [2020-08-21 19:53:38,154 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-21 19:53:38,154 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:53:38,155 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-21 19:53:38,155 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=1602, Unknown=0, NotChecked=0, Total=1722 [2020-08-21 19:53:38,156 INFO L87 Difference]: Start difference. First operand 50 states and 50 transitions. Second operand 42 states. [2020-08-21 19:53:39,215 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:53:39,215 INFO L93 Difference]: Finished difference Result 56 states and 56 transitions. [2020-08-21 19:53:39,216 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-21 19:53:39,216 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 49 [2020-08-21 19:53:39,216 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:53:39,216 INFO L225 Difference]: With dead ends: 56 [2020-08-21 19:53:39,216 INFO L226 Difference]: Without dead ends: 51 [2020-08-21 19:53:39,217 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=120, Invalid=1602, Unknown=0, NotChecked=0, Total=1722 [2020-08-21 19:53:39,217 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-08-21 19:53:39,219 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2020-08-21 19:53:39,219 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-21 19:53:39,220 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2020-08-21 19:53:39,220 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 49 [2020-08-21 19:53:39,220 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:53:39,220 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2020-08-21 19:53:39,220 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-21 19:53:39,220 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2020-08-21 19:53:39,221 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-21 19:53:39,221 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:53:39,221 INFO L422 BasicCegarLoop]: trace histogram [40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:53:39,221 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-21 19:53:39,221 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:53:39,221 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:53:39,221 INFO L82 PathProgramCache]: Analyzing trace with hash 764956350, now seen corresponding path program 40 times [2020-08-21 19:53:39,221 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:53:39,222 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1070026336] [2020-08-21 19:53:39,222 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:53:39,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:40,525 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:53:40,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:40,530 INFO L134 CoverageAnalysis]: Checked inductivity of 820 backedges. 0 proven. 820 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:53:40,530 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1070026336] [2020-08-21 19:53:40,531 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:53:40,531 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-21 19:53:40,531 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1147805151] [2020-08-21 19:53:40,531 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-21 19:53:40,531 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:53:40,532 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-21 19:53:40,532 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=1683, Unknown=0, NotChecked=0, Total=1806 [2020-08-21 19:53:40,532 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 43 states. [2020-08-21 19:53:41,680 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:53:41,681 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2020-08-21 19:53:41,681 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-08-21 19:53:41,681 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 50 [2020-08-21 19:53:41,682 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:53:41,682 INFO L225 Difference]: With dead ends: 57 [2020-08-21 19:53:41,682 INFO L226 Difference]: Without dead ends: 52 [2020-08-21 19:53:41,683 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=123, Invalid=1683, Unknown=0, NotChecked=0, Total=1806 [2020-08-21 19:53:41,684 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-21 19:53:41,686 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2020-08-21 19:53:41,687 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-08-21 19:53:41,687 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 52 transitions. [2020-08-21 19:53:41,687 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 52 transitions. Word has length 50 [2020-08-21 19:53:41,687 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:53:41,687 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 52 transitions. [2020-08-21 19:53:41,688 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-21 19:53:41,688 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 52 transitions. [2020-08-21 19:53:41,688 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-08-21 19:53:41,688 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:53:41,688 INFO L422 BasicCegarLoop]: trace histogram [41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:53:41,688 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-21 19:53:41,689 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:53:41,689 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:53:41,689 INFO L82 PathProgramCache]: Analyzing trace with hash -2019695663, now seen corresponding path program 41 times [2020-08-21 19:53:41,689 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:53:41,689 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [243624354] [2020-08-21 19:53:41,689 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:53:41,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:43,072 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:53:43,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:43,078 INFO L134 CoverageAnalysis]: Checked inductivity of 861 backedges. 0 proven. 861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:53:43,078 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [243624354] [2020-08-21 19:53:43,078 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:53:43,078 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44] total 44 [2020-08-21 19:53:43,078 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [445664856] [2020-08-21 19:53:43,078 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-08-21 19:53:43,079 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:53:43,079 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-08-21 19:53:43,079 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=1766, Unknown=0, NotChecked=0, Total=1892 [2020-08-21 19:53:43,079 INFO L87 Difference]: Start difference. First operand 52 states and 52 transitions. Second operand 44 states. [2020-08-21 19:53:44,276 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:53:44,276 INFO L93 Difference]: Finished difference Result 58 states and 58 transitions. [2020-08-21 19:53:44,277 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-08-21 19:53:44,277 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 51 [2020-08-21 19:53:44,277 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:53:44,278 INFO L225 Difference]: With dead ends: 58 [2020-08-21 19:53:44,278 INFO L226 Difference]: Without dead ends: 53 [2020-08-21 19:53:44,279 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=126, Invalid=1766, Unknown=0, NotChecked=0, Total=1892 [2020-08-21 19:53:44,279 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-08-21 19:53:44,282 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2020-08-21 19:53:44,282 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-21 19:53:44,283 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2020-08-21 19:53:44,283 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 51 [2020-08-21 19:53:44,283 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:53:44,283 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2020-08-21 19:53:44,283 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-08-21 19:53:44,284 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2020-08-21 19:53:44,284 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-21 19:53:44,284 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:53:44,284 INFO L422 BasicCegarLoop]: trace histogram [42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:53:44,284 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-08-21 19:53:44,284 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:53:44,285 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:53:44,285 INFO L82 PathProgramCache]: Analyzing trace with hash 1850405150, now seen corresponding path program 42 times [2020-08-21 19:53:44,285 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:53:44,285 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [876035109] [2020-08-21 19:53:44,285 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:53:44,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:45,699 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:53:45,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:45,706 INFO L134 CoverageAnalysis]: Checked inductivity of 903 backedges. 0 proven. 903 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:53:45,706 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [876035109] [2020-08-21 19:53:45,706 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:53:45,706 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45] total 45 [2020-08-21 19:53:45,706 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1163114591] [2020-08-21 19:53:45,707 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2020-08-21 19:53:45,707 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:53:45,707 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2020-08-21 19:53:45,708 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=1851, Unknown=0, NotChecked=0, Total=1980 [2020-08-21 19:53:45,708 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 45 states. [2020-08-21 19:53:46,988 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:53:46,988 INFO L93 Difference]: Finished difference Result 59 states and 59 transitions. [2020-08-21 19:53:46,990 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2020-08-21 19:53:46,990 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 52 [2020-08-21 19:53:46,990 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:53:46,990 INFO L225 Difference]: With dead ends: 59 [2020-08-21 19:53:46,990 INFO L226 Difference]: Without dead ends: 54 [2020-08-21 19:53:46,991 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=129, Invalid=1851, Unknown=0, NotChecked=0, Total=1980 [2020-08-21 19:53:46,991 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-21 19:53:46,995 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2020-08-21 19:53:46,995 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-08-21 19:53:46,996 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 54 transitions. [2020-08-21 19:53:46,996 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 54 transitions. Word has length 52 [2020-08-21 19:53:46,996 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:53:46,997 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 54 transitions. [2020-08-21 19:53:46,997 INFO L480 AbstractCegarLoop]: Interpolant automaton has 45 states. [2020-08-21 19:53:46,997 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 54 transitions. [2020-08-21 19:53:46,997 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-08-21 19:53:46,997 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:53:46,997 INFO L422 BasicCegarLoop]: trace histogram [43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:53:46,997 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2020-08-21 19:53:46,997 INFO L427 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:53:46,997 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:53:46,998 INFO L82 PathProgramCache]: Analyzing trace with hash 1564446065, now seen corresponding path program 43 times [2020-08-21 19:53:46,998 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:53:46,998 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [398814970] [2020-08-21 19:53:46,998 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:53:47,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:48,542 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:53:48,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:48,548 INFO L134 CoverageAnalysis]: Checked inductivity of 946 backedges. 0 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:53:48,548 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [398814970] [2020-08-21 19:53:48,548 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:53:48,548 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46] total 46 [2020-08-21 19:53:48,548 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [974064992] [2020-08-21 19:53:48,549 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2020-08-21 19:53:48,549 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:53:48,549 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2020-08-21 19:53:48,550 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=1938, Unknown=0, NotChecked=0, Total=2070 [2020-08-21 19:53:48,550 INFO L87 Difference]: Start difference. First operand 54 states and 54 transitions. Second operand 46 states. [2020-08-21 19:53:49,868 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:53:49,869 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2020-08-21 19:53:49,869 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2020-08-21 19:53:49,870 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 53 [2020-08-21 19:53:49,870 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:53:49,870 INFO L225 Difference]: With dead ends: 60 [2020-08-21 19:53:49,871 INFO L226 Difference]: Without dead ends: 55 [2020-08-21 19:53:49,871 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=132, Invalid=1938, Unknown=0, NotChecked=0, Total=2070 [2020-08-21 19:53:49,871 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-08-21 19:53:49,874 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2020-08-21 19:53:49,874 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-21 19:53:49,874 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2020-08-21 19:53:49,874 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 53 [2020-08-21 19:53:49,875 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:53:49,875 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2020-08-21 19:53:49,875 INFO L480 AbstractCegarLoop]: Interpolant automaton has 46 states. [2020-08-21 19:53:49,875 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2020-08-21 19:53:49,875 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-21 19:53:49,875 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:53:49,875 INFO L422 BasicCegarLoop]: trace histogram [44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:53:49,875 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2020-08-21 19:53:49,875 INFO L427 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:53:49,876 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:53:49,876 INFO L82 PathProgramCache]: Analyzing trace with hash 1289649022, now seen corresponding path program 44 times [2020-08-21 19:53:49,876 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:53:49,876 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [411348212] [2020-08-21 19:53:49,876 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:53:49,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:51,404 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:53:51,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:51,411 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 990 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:53:51,411 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [411348212] [2020-08-21 19:53:51,411 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:53:51,411 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47] total 47 [2020-08-21 19:53:51,411 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [466545387] [2020-08-21 19:53:51,412 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2020-08-21 19:53:51,412 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:53:51,412 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2020-08-21 19:53:51,412 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=2027, Unknown=0, NotChecked=0, Total=2162 [2020-08-21 19:53:51,412 INFO L87 Difference]: Start difference. First operand 55 states and 55 transitions. Second operand 47 states. [2020-08-21 19:53:52,779 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:53:52,780 INFO L93 Difference]: Finished difference Result 61 states and 61 transitions. [2020-08-21 19:53:52,780 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2020-08-21 19:53:52,780 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 54 [2020-08-21 19:53:52,781 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:53:52,781 INFO L225 Difference]: With dead ends: 61 [2020-08-21 19:53:52,781 INFO L226 Difference]: Without dead ends: 56 [2020-08-21 19:53:52,782 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=135, Invalid=2027, Unknown=0, NotChecked=0, Total=2162 [2020-08-21 19:53:52,782 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-08-21 19:53:52,785 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2020-08-21 19:53:52,785 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-08-21 19:53:52,786 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 56 transitions. [2020-08-21 19:53:52,786 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 56 transitions. Word has length 54 [2020-08-21 19:53:52,786 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:53:52,786 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 56 transitions. [2020-08-21 19:53:52,786 INFO L480 AbstractCegarLoop]: Interpolant automaton has 47 states. [2020-08-21 19:53:52,787 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 56 transitions. [2020-08-21 19:53:52,787 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-08-21 19:53:52,787 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:53:52,787 INFO L422 BasicCegarLoop]: trace histogram [45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:53:52,787 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2020-08-21 19:53:52,787 INFO L427 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:53:52,788 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:53:52,788 INFO L82 PathProgramCache]: Analyzing trace with hash 1360875281, now seen corresponding path program 45 times [2020-08-21 19:53:52,788 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:53:52,788 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [191823915] [2020-08-21 19:53:52,788 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:53:52,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:54,674 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:53:54,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:54,681 INFO L134 CoverageAnalysis]: Checked inductivity of 1035 backedges. 0 proven. 1035 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:53:54,681 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [191823915] [2020-08-21 19:53:54,682 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:53:54,682 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48] total 48 [2020-08-21 19:53:54,683 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [536509941] [2020-08-21 19:53:54,683 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-08-21 19:53:54,683 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:53:54,683 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-08-21 19:53:54,684 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=2118, Unknown=0, NotChecked=0, Total=2256 [2020-08-21 19:53:54,684 INFO L87 Difference]: Start difference. First operand 56 states and 56 transitions. Second operand 48 states. [2020-08-21 19:53:56,061 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:53:56,062 INFO L93 Difference]: Finished difference Result 62 states and 62 transitions. [2020-08-21 19:53:56,062 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-08-21 19:53:56,063 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 55 [2020-08-21 19:53:56,063 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:53:56,063 INFO L225 Difference]: With dead ends: 62 [2020-08-21 19:53:56,064 INFO L226 Difference]: Without dead ends: 57 [2020-08-21 19:53:56,064 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=138, Invalid=2118, Unknown=0, NotChecked=0, Total=2256 [2020-08-21 19:53:56,064 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-08-21 19:53:56,067 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2020-08-21 19:53:56,067 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-21 19:53:56,067 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2020-08-21 19:53:56,067 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 55 [2020-08-21 19:53:56,068 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:53:56,068 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2020-08-21 19:53:56,068 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-08-21 19:53:56,068 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2020-08-21 19:53:56,068 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-21 19:53:56,069 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:53:56,069 INFO L422 BasicCegarLoop]: trace histogram [46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:53:56,069 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2020-08-21 19:53:56,069 INFO L427 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:53:56,069 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:53:56,069 INFO L82 PathProgramCache]: Analyzing trace with hash -726077986, now seen corresponding path program 46 times [2020-08-21 19:53:56,070 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:53:56,070 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1425125307] [2020-08-21 19:53:56,070 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:53:56,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:57,728 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:53:57,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:57,736 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:53:57,737 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1425125307] [2020-08-21 19:53:57,737 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:53:57,737 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49] total 49 [2020-08-21 19:53:57,737 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [249591326] [2020-08-21 19:53:57,737 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2020-08-21 19:53:57,738 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:53:57,738 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2020-08-21 19:53:57,738 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=2211, Unknown=0, NotChecked=0, Total=2352 [2020-08-21 19:53:57,738 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 49 states. [2020-08-21 19:53:59,207 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:53:59,207 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2020-08-21 19:53:59,208 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2020-08-21 19:53:59,208 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 56 [2020-08-21 19:53:59,208 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:53:59,209 INFO L225 Difference]: With dead ends: 63 [2020-08-21 19:53:59,209 INFO L226 Difference]: Without dead ends: 58 [2020-08-21 19:53:59,210 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=141, Invalid=2211, Unknown=0, NotChecked=0, Total=2352 [2020-08-21 19:53:59,210 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-21 19:53:59,214 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2020-08-21 19:53:59,214 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-08-21 19:53:59,214 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 58 transitions. [2020-08-21 19:53:59,215 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 58 transitions. Word has length 56 [2020-08-21 19:53:59,215 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:53:59,215 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 58 transitions. [2020-08-21 19:53:59,215 INFO L480 AbstractCegarLoop]: Interpolant automaton has 49 states. [2020-08-21 19:53:59,215 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 58 transitions. [2020-08-21 19:53:59,216 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-08-21 19:53:59,216 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:53:59,216 INFO L422 BasicCegarLoop]: trace histogram [47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:53:59,216 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2020-08-21 19:53:59,216 INFO L427 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:53:59,217 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:53:59,217 INFO L82 PathProgramCache]: Analyzing trace with hash -997119823, now seen corresponding path program 47 times [2020-08-21 19:53:59,217 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:53:59,217 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2077980831] [2020-08-21 19:53:59,217 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:53:59,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:54:00,902 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:54:00,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:54:00,914 INFO L134 CoverageAnalysis]: Checked inductivity of 1128 backedges. 0 proven. 1128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:54:00,914 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2077980831] [2020-08-21 19:54:00,916 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:54:00,917 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50] total 50 [2020-08-21 19:54:00,917 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [746021092] [2020-08-21 19:54:00,917 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-08-21 19:54:00,919 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:54:00,919 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-08-21 19:54:00,919 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=144, Invalid=2306, Unknown=0, NotChecked=0, Total=2450 [2020-08-21 19:54:00,922 INFO L87 Difference]: Start difference. First operand 58 states and 58 transitions. Second operand 50 states. [2020-08-21 19:54:02,454 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:54:02,454 INFO L93 Difference]: Finished difference Result 64 states and 64 transitions. [2020-08-21 19:54:02,459 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2020-08-21 19:54:02,459 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 57 [2020-08-21 19:54:02,459 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:54:02,460 INFO L225 Difference]: With dead ends: 64 [2020-08-21 19:54:02,460 INFO L226 Difference]: Without dead ends: 59 [2020-08-21 19:54:02,460 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=144, Invalid=2306, Unknown=0, NotChecked=0, Total=2450 [2020-08-21 19:54:02,461 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-08-21 19:54:02,468 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2020-08-21 19:54:02,468 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-08-21 19:54:02,469 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 59 transitions. [2020-08-21 19:54:02,469 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 59 transitions. Word has length 57 [2020-08-21 19:54:02,469 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:54:02,469 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 59 transitions. [2020-08-21 19:54:02,469 INFO L480 AbstractCegarLoop]: Interpolant automaton has 50 states. [2020-08-21 19:54:02,469 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 59 transitions. [2020-08-21 19:54:02,470 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-08-21 19:54:02,470 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:54:02,470 INFO L422 BasicCegarLoop]: trace histogram [48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:54:02,470 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47 [2020-08-21 19:54:02,470 INFO L427 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:54:02,471 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:54:02,471 INFO L82 PathProgramCache]: Analyzing trace with hash -809482178, now seen corresponding path program 48 times [2020-08-21 19:54:02,471 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:54:02,471 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1988527326] [2020-08-21 19:54:02,471 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:54:02,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat