/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5000 --traceabstraction.additional.smt.options interpolation-heuristic=NARROWEST --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/ldv-regression/test25-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 21:23:19,273 INFO L177 SettingsManager]: Resetting all preferences to default values... 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[2020-08-21 21:23:19,318 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 21:23:19,327 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 21:23:19,329 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 21:23:19,333 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 21:23:19,335 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 21:23:19,339 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 21:23:19,340 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 21:23:19,341 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 21:23:19,341 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 21:23:19,344 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 21:23:19,346 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 21:23:19,348 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 21:23:19,350 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 21:23:19,350 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 21:23:19,352 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 21:23:19,360 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 21:23:19,362 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 21:23:19,363 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 21:23:19,364 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 21:23:19,365 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 21:23:19,382 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-21 21:23:19,395 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 21:23:19,397 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 21:23:19,398 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 21:23:19,399 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-21 21:23:19,437 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 21:23:19,437 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 21:23:19,439 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 21:23:19,439 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 21:23:19,439 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 21:23:19,439 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 21:23:19,440 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 21:23:19,440 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 21:23:19,440 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 21:23:19,440 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 21:23:19,440 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 21:23:19,440 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 21:23:19,441 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 21:23:19,441 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 21:23:19,441 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 21:23:19,441 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 21:23:19,441 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 21:23:19,442 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 21:23:19,444 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 21:23:19,444 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 21:23:19,444 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 21:23:19,444 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 21:23:19,444 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 21:23:19,444 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 21:23:19,445 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 21:23:19,445 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 21:23:19,445 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 21:23:19,445 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 21:23:19,445 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 21:23:19,445 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=NARROWEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=NARROWEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=NARROWEST;log-additional-information=true; [2020-08-21 21:23:19,731 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 21:23:19,743 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 21:23:19,747 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 21:23:19,748 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 21:23:19,749 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 21:23:19,749 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-regression/test25-2.c [2020-08-21 21:23:19,817 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/171231bb4/4c49a61334b94cb78201f22699b169d8/FLAG72d7c33eb [2020-08-21 21:23:20,284 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 21:23:20,285 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/ldv-regression/test25-2.c [2020-08-21 21:23:20,291 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/171231bb4/4c49a61334b94cb78201f22699b169d8/FLAG72d7c33eb [2020-08-21 21:23:20,666 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/171231bb4/4c49a61334b94cb78201f22699b169d8 [2020-08-21 21:23:20,675 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 21:23:20,677 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 21:23:20,678 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 21:23:20,678 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 21:23:20,682 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 21:23:20,683 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 09:23:20" (1/1) ... [2020-08-21 21:23:20,686 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2f2210ab and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:23:20, skipping insertion in model container [2020-08-21 21:23:20,687 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 09:23:20" (1/1) ... [2020-08-21 21:23:20,696 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 21:23:20,726 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 21:23:20,992 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 21:23:21,000 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 21:23:21,019 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 21:23:21,119 INFO L208 MainTranslator]: Completed translation [2020-08-21 21:23:21,120 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:23:21 WrapperNode [2020-08-21 21:23:21,120 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 21:23:21,121 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 21:23:21,121 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 21:23:21,121 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 21:23:21,139 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:23:21" (1/1) ... [2020-08-21 21:23:21,139 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:23:21" (1/1) ... [2020-08-21 21:23:21,148 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:23:21" (1/1) ... [2020-08-21 21:23:21,149 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:23:21" (1/1) ... [2020-08-21 21:23:21,163 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:23:21" (1/1) ... [2020-08-21 21:23:21,168 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:23:21" (1/1) ... [2020-08-21 21:23:21,170 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:23:21" (1/1) ... [2020-08-21 21:23:21,173 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 21:23:21,173 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 21:23:21,174 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 21:23:21,174 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 21:23:21,175 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:23:21" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 21:23:21,245 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 21:23:21,245 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 21:23:21,245 INFO L138 BoogieDeclarations]: Found implementation of procedure check [2020-08-21 21:23:21,245 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 21:23:21,246 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 21:23:21,246 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-21 21:23:21,247 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-08-21 21:23:21,247 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-08-21 21:23:21,247 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-21 21:23:21,247 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 21:23:21,247 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-21 21:23:21,247 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-21 21:23:21,248 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-08-21 21:23:21,248 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-21 21:23:21,248 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 21:23:21,248 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 21:23:21,532 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 21:23:21,533 INFO L295 CfgBuilder]: Removed 2 assume(true) statements. [2020-08-21 21:23:21,538 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 09:23:21 BoogieIcfgContainer [2020-08-21 21:23:21,538 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 21:23:21,540 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 21:23:21,540 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 21:23:21,545 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 21:23:21,545 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 09:23:20" (1/3) ... [2020-08-21 21:23:21,546 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@307d047c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 09:23:21, skipping insertion in model container [2020-08-21 21:23:21,546 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:23:21" (2/3) ... [2020-08-21 21:23:21,547 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@307d047c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 09:23:21, skipping insertion in model container [2020-08-21 21:23:21,547 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 09:23:21" (3/3) ... [2020-08-21 21:23:21,549 INFO L109 eAbstractionObserver]: Analyzing ICFG test25-2.c [2020-08-21 21:23:21,562 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 21:23:21,572 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 21:23:21,588 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 21:23:21,615 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 21:23:21,615 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 21:23:21,615 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 21:23:21,616 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 21:23:21,616 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 21:23:21,616 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 21:23:21,616 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 21:23:21,616 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 21:23:21,641 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states. [2020-08-21 21:23:21,648 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-21 21:23:21,648 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:23:21,649 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:23:21,650 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:23:21,658 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:23:21,659 INFO L82 PathProgramCache]: Analyzing trace with hash -899836778, now seen corresponding path program 1 times [2020-08-21 21:23:21,669 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:23:21,670 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [964368709] [2020-08-21 21:23:21,670 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:23:21,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:21,872 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:23:21,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:21,883 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-21 21:23:21,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:21,901 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:23:21,902 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [964368709] [2020-08-21 21:23:21,905 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 21:23:21,905 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-21 21:23:21,907 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [877857098] [2020-08-21 21:23:21,912 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-21 21:23:21,913 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:23:21,927 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-21 21:23:21,928 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 21:23:21,930 INFO L87 Difference]: Start difference. First operand 25 states. Second operand 3 states. [2020-08-21 21:23:22,051 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:23:22,052 INFO L93 Difference]: Finished difference Result 42 states and 52 transitions. [2020-08-21 21:23:22,053 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 21:23:22,055 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2020-08-21 21:23:22,055 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:23:22,065 INFO L225 Difference]: With dead ends: 42 [2020-08-21 21:23:22,065 INFO L226 Difference]: Without dead ends: 20 [2020-08-21 21:23:22,069 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 21:23:22,085 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-21 21:23:22,103 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-21 21:23:22,104 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-21 21:23:22,105 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2020-08-21 21:23:22,107 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 17 [2020-08-21 21:23:22,107 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:23:22,107 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2020-08-21 21:23:22,108 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-21 21:23:22,108 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2020-08-21 21:23:22,109 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-21 21:23:22,109 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:23:22,109 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:23:22,110 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 21:23:22,110 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:23:22,111 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:23:22,111 INFO L82 PathProgramCache]: Analyzing trace with hash -1137678901, now seen corresponding path program 1 times [2020-08-21 21:23:22,111 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:23:22,112 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1373076850] [2020-08-21 21:23:22,112 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:23:22,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:22,188 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:23:22,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:22,194 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-08-21 21:23:22,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:22,205 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:23:22,205 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1373076850] [2020-08-21 21:23:22,205 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 21:23:22,206 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-21 21:23:22,206 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1005254935] [2020-08-21 21:23:22,208 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 21:23:22,208 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:23:22,208 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 21:23:22,209 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 21:23:22,209 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand 4 states. [2020-08-21 21:23:22,286 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:23:22,286 INFO L93 Difference]: Finished difference Result 34 states and 36 transitions. [2020-08-21 21:23:22,286 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-21 21:23:22,287 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 18 [2020-08-21 21:23:22,287 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:23:22,288 INFO L225 Difference]: With dead ends: 34 [2020-08-21 21:23:22,288 INFO L226 Difference]: Without dead ends: 22 [2020-08-21 21:23:22,289 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 21:23:22,290 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-21 21:23:22,295 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2020-08-21 21:23:22,295 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-21 21:23:22,296 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2020-08-21 21:23:22,296 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 18 [2020-08-21 21:23:22,297 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:23:22,297 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2020-08-21 21:23:22,297 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 21:23:22,297 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2020-08-21 21:23:22,298 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-21 21:23:22,298 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:23:22,298 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:23:22,299 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 21:23:22,299 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:23:22,299 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:23:22,300 INFO L82 PathProgramCache]: Analyzing trace with hash 278779309, now seen corresponding path program 1 times [2020-08-21 21:23:22,300 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:23:22,300 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1482269194] [2020-08-21 21:23:22,301 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:23:22,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:22,381 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:23:22,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:22,392 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2020-08-21 21:23:22,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:22,409 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 21:23:22,409 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1482269194] [2020-08-21 21:23:22,409 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:23:22,410 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-21 21:23:22,415 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1995338962] [2020-08-21 21:23:22,416 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 21:23:22,416 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:23:22,416 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 21:23:22,416 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-21 21:23:22,417 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 5 states. [2020-08-21 21:23:22,501 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:23:22,501 INFO L93 Difference]: Finished difference Result 36 states and 38 transitions. [2020-08-21 21:23:22,502 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 21:23:22,502 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 20 [2020-08-21 21:23:22,503 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:23:22,503 INFO L225 Difference]: With dead ends: 36 [2020-08-21 21:23:22,503 INFO L226 Difference]: Without dead ends: 24 [2020-08-21 21:23:22,505 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-21 21:23:22,506 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-21 21:23:22,512 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2020-08-21 21:23:22,513 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-21 21:23:22,514 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2020-08-21 21:23:22,514 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 20 [2020-08-21 21:23:22,515 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:23:22,515 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2020-08-21 21:23:22,515 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 21:23:22,515 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2020-08-21 21:23:22,516 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-21 21:23:22,516 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:23:22,516 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:23:22,517 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 21:23:22,517 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:23:22,517 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:23:22,518 INFO L82 PathProgramCache]: Analyzing trace with hash -9513713, now seen corresponding path program 2 times [2020-08-21 21:23:22,518 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:23:22,518 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2058432979] [2020-08-21 21:23:22,518 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:23:22,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:22,634 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:23:22,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:22,640 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2020-08-21 21:23:22,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:22,646 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:23:22,647 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2058432979] [2020-08-21 21:23:22,647 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:23:22,647 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-21 21:23:22,648 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1384402805] [2020-08-21 21:23:22,648 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 21:23:22,649 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:23:22,649 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 21:23:22,649 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-21 21:23:22,649 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand 6 states. [2020-08-21 21:23:22,739 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:23:22,739 INFO L93 Difference]: Finished difference Result 38 states and 40 transitions. [2020-08-21 21:23:22,740 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 21:23:22,740 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 22 [2020-08-21 21:23:22,740 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:23:22,741 INFO L225 Difference]: With dead ends: 38 [2020-08-21 21:23:22,741 INFO L226 Difference]: Without dead ends: 26 [2020-08-21 21:23:22,742 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-21 21:23:22,742 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-21 21:23:22,746 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2020-08-21 21:23:22,747 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-21 21:23:22,748 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 26 transitions. [2020-08-21 21:23:22,748 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 26 transitions. Word has length 22 [2020-08-21 21:23:22,748 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:23:22,748 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 26 transitions. [2020-08-21 21:23:22,748 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 21:23:22,749 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 26 transitions. [2020-08-21 21:23:22,749 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-21 21:23:22,749 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:23:22,750 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:23:22,750 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 21:23:22,750 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:23:22,750 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:23:22,751 INFO L82 PathProgramCache]: Analyzing trace with hash 2113766385, now seen corresponding path program 3 times [2020-08-21 21:23:22,751 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:23:22,751 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1979131914] [2020-08-21 21:23:22,751 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:23:22,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:22,834 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:23:22,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:22,839 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2020-08-21 21:23:22,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:22,844 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:23:22,845 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1979131914] [2020-08-21 21:23:22,845 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:23:22,845 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 21:23:22,845 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [37220295] [2020-08-21 21:23:22,846 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 21:23:22,846 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:23:22,846 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 21:23:22,847 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-08-21 21:23:22,847 INFO L87 Difference]: Start difference. First operand 25 states and 26 transitions. Second operand 7 states. [2020-08-21 21:23:22,921 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:23:22,921 INFO L93 Difference]: Finished difference Result 40 states and 42 transitions. [2020-08-21 21:23:22,922 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 21:23:22,922 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 24 [2020-08-21 21:23:22,922 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:23:22,923 INFO L225 Difference]: With dead ends: 40 [2020-08-21 21:23:22,923 INFO L226 Difference]: Without dead ends: 28 [2020-08-21 21:23:22,924 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-08-21 21:23:22,924 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-21 21:23:22,928 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2020-08-21 21:23:22,929 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-21 21:23:22,930 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2020-08-21 21:23:22,930 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 24 [2020-08-21 21:23:22,930 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:23:22,931 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2020-08-21 21:23:22,931 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 21:23:22,931 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2020-08-21 21:23:22,932 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-21 21:23:22,932 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:23:22,932 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:23:22,932 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 21:23:22,933 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:23:22,933 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:23:22,933 INFO L82 PathProgramCache]: Analyzing trace with hash -1818492333, now seen corresponding path program 4 times [2020-08-21 21:23:22,933 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:23:22,934 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1574991327] [2020-08-21 21:23:22,934 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:23:22,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:23,081 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:23:23,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:23,087 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2020-08-21 21:23:23,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:23,096 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:23:23,097 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1574991327] [2020-08-21 21:23:23,098 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:23:23,098 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 21:23:23,098 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [985221594] [2020-08-21 21:23:23,099 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 21:23:23,105 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:23:23,105 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 21:23:23,106 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-08-21 21:23:23,106 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 8 states. [2020-08-21 21:23:23,186 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:23:23,187 INFO L93 Difference]: Finished difference Result 42 states and 44 transitions. [2020-08-21 21:23:23,187 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-21 21:23:23,187 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 26 [2020-08-21 21:23:23,188 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:23:23,188 INFO L225 Difference]: With dead ends: 42 [2020-08-21 21:23:23,188 INFO L226 Difference]: Without dead ends: 30 [2020-08-21 21:23:23,189 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-08-21 21:23:23,190 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-21 21:23:23,194 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2020-08-21 21:23:23,194 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-21 21:23:23,195 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 30 transitions. [2020-08-21 21:23:23,195 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 30 transitions. Word has length 26 [2020-08-21 21:23:23,195 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:23:23,196 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 30 transitions. [2020-08-21 21:23:23,196 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 21:23:23,196 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 30 transitions. [2020-08-21 21:23:23,196 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-21 21:23:23,197 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:23:23,197 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:23:23,197 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 21:23:23,197 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:23:23,198 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:23:23,198 INFO L82 PathProgramCache]: Analyzing trace with hash -1147899851, now seen corresponding path program 5 times [2020-08-21 21:23:23,198 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:23:23,198 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1833800170] [2020-08-21 21:23:23,199 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:23:23,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:23,322 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:23:23,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:23,326 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2020-08-21 21:23:23,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:23,335 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:23:23,336 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1833800170] [2020-08-21 21:23:23,336 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:23:23,336 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 21:23:23,336 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1292311560] [2020-08-21 21:23:23,338 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 21:23:23,338 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:23:23,338 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 21:23:23,339 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2020-08-21 21:23:23,340 INFO L87 Difference]: Start difference. First operand 29 states and 30 transitions. Second operand 9 states. [2020-08-21 21:23:23,444 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:23:23,445 INFO L93 Difference]: Finished difference Result 44 states and 46 transitions. [2020-08-21 21:23:23,445 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 21:23:23,445 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 28 [2020-08-21 21:23:23,446 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:23:23,446 INFO L225 Difference]: With dead ends: 44 [2020-08-21 21:23:23,446 INFO L226 Difference]: Without dead ends: 32 [2020-08-21 21:23:23,447 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2020-08-21 21:23:23,448 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-21 21:23:23,455 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2020-08-21 21:23:23,455 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-21 21:23:23,456 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 32 transitions. [2020-08-21 21:23:23,456 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 32 transitions. Word has length 28 [2020-08-21 21:23:23,456 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:23:23,457 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 32 transitions. [2020-08-21 21:23:23,458 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 21:23:23,458 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 32 transitions. [2020-08-21 21:23:23,461 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-21 21:23:23,461 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:23:23,461 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:23:23,462 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 21:23:23,462 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:23:23,462 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:23:23,462 INFO L82 PathProgramCache]: Analyzing trace with hash -953619049, now seen corresponding path program 6 times [2020-08-21 21:23:23,463 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:23:23,463 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [196409708] [2020-08-21 21:23:23,463 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:23:23,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:23,582 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:23:23,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:23,586 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-08-21 21:23:23,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:23,593 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 21:23:23,594 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [196409708] [2020-08-21 21:23:23,594 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:23:23,595 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-21 21:23:23,595 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1420072640] [2020-08-21 21:23:23,596 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 21:23:23,596 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:23:23,596 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 21:23:23,597 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2020-08-21 21:23:23,597 INFO L87 Difference]: Start difference. First operand 31 states and 32 transitions. Second operand 10 states. [2020-08-21 21:23:23,695 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:23:23,695 INFO L93 Difference]: Finished difference Result 46 states and 48 transitions. [2020-08-21 21:23:23,696 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 21:23:23,696 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 30 [2020-08-21 21:23:23,696 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:23:23,697 INFO L225 Difference]: With dead ends: 46 [2020-08-21 21:23:23,697 INFO L226 Difference]: Without dead ends: 34 [2020-08-21 21:23:23,698 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2020-08-21 21:23:23,698 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-21 21:23:23,702 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2020-08-21 21:23:23,703 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-21 21:23:23,704 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2020-08-21 21:23:23,704 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 30 [2020-08-21 21:23:23,704 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:23:23,704 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2020-08-21 21:23:23,704 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 21:23:23,705 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2020-08-21 21:23:23,705 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-21 21:23:23,705 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:23:23,706 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:23:23,706 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-21 21:23:23,706 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:23:23,707 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:23:23,707 INFO L82 PathProgramCache]: Analyzing trace with hash 1066637945, now seen corresponding path program 7 times [2020-08-21 21:23:23,707 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:23:23,707 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [887386585] [2020-08-21 21:23:23,708 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:23:23,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:23,847 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:23:23,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:23,850 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2020-08-21 21:23:23,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:23,854 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:23:23,854 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [887386585] [2020-08-21 21:23:23,855 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:23:23,855 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-21 21:23:23,855 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1741879471] [2020-08-21 21:23:23,856 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 21:23:23,856 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:23:23,856 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 21:23:23,856 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2020-08-21 21:23:23,857 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 11 states. [2020-08-21 21:23:23,969 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:23:23,969 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2020-08-21 21:23:23,970 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-21 21:23:23,970 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 32 [2020-08-21 21:23:23,970 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:23:23,971 INFO L225 Difference]: With dead ends: 48 [2020-08-21 21:23:23,971 INFO L226 Difference]: Without dead ends: 36 [2020-08-21 21:23:23,972 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2020-08-21 21:23:23,972 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-21 21:23:23,976 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2020-08-21 21:23:23,976 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-21 21:23:23,977 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 36 transitions. [2020-08-21 21:23:23,977 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 36 transitions. Word has length 32 [2020-08-21 21:23:23,977 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:23:23,977 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 36 transitions. [2020-08-21 21:23:23,978 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 21:23:23,978 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 36 transitions. [2020-08-21 21:23:23,978 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-21 21:23:23,978 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:23:23,979 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:23:23,979 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-21 21:23:23,979 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:23:23,979 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:23:23,980 INFO L82 PathProgramCache]: Analyzing trace with hash 1208391387, now seen corresponding path program 8 times [2020-08-21 21:23:23,980 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:23:23,980 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1204661727] [2020-08-21 21:23:23,980 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:23:24,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:24,123 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:23:24,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:24,126 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2020-08-21 21:23:24,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:24,130 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:23:24,131 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1204661727] [2020-08-21 21:23:24,131 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:23:24,131 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-21 21:23:24,132 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1105435889] [2020-08-21 21:23:24,132 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-21 21:23:24,132 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:23:24,133 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-21 21:23:24,133 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2020-08-21 21:23:24,133 INFO L87 Difference]: Start difference. First operand 35 states and 36 transitions. Second operand 12 states. [2020-08-21 21:23:24,232 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:23:24,233 INFO L93 Difference]: Finished difference Result 50 states and 52 transitions. [2020-08-21 21:23:24,233 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-21 21:23:24,233 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 34 [2020-08-21 21:23:24,234 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:23:24,235 INFO L225 Difference]: With dead ends: 50 [2020-08-21 21:23:24,235 INFO L226 Difference]: Without dead ends: 38 [2020-08-21 21:23:24,235 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2020-08-21 21:23:24,238 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-21 21:23:24,249 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2020-08-21 21:23:24,249 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-21 21:23:24,250 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 38 transitions. [2020-08-21 21:23:24,250 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 38 transitions. Word has length 34 [2020-08-21 21:23:24,251 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:23:24,251 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 38 transitions. [2020-08-21 21:23:24,251 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-21 21:23:24,251 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 38 transitions. [2020-08-21 21:23:24,253 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-21 21:23:24,253 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:23:24,253 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:23:24,254 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-21 21:23:24,254 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:23:24,254 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:23:24,254 INFO L82 PathProgramCache]: Analyzing trace with hash -5504323, now seen corresponding path program 9 times [2020-08-21 21:23:24,257 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:23:24,257 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1055230789] [2020-08-21 21:23:24,257 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:23:24,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:24,424 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:23:24,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:24,427 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2020-08-21 21:23:24,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:24,433 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:23:24,434 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1055230789] [2020-08-21 21:23:24,434 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:23:24,434 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 21:23:24,434 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1942690349] [2020-08-21 21:23:24,436 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 21:23:24,436 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:23:24,436 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 21:23:24,437 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2020-08-21 21:23:24,437 INFO L87 Difference]: Start difference. First operand 37 states and 38 transitions. Second operand 13 states. [2020-08-21 21:23:24,548 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:23:24,548 INFO L93 Difference]: Finished difference Result 51 states and 53 transitions. [2020-08-21 21:23:24,548 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-21 21:23:24,548 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 36 [2020-08-21 21:23:24,549 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:23:24,549 INFO L225 Difference]: With dead ends: 51 [2020-08-21 21:23:24,550 INFO L226 Difference]: Without dead ends: 39 [2020-08-21 21:23:24,550 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2020-08-21 21:23:24,552 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-21 21:23:24,558 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-08-21 21:23:24,558 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-21 21:23:24,559 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2020-08-21 21:23:24,559 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 36 [2020-08-21 21:23:24,561 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:23:24,562 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2020-08-21 21:23:24,562 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 21:23:24,562 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2020-08-21 21:23:24,564 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-21 21:23:24,564 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:23:24,564 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:23:24,564 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-21 21:23:24,564 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:23:24,565 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:23:24,565 INFO L82 PathProgramCache]: Analyzing trace with hash 1671822879, now seen corresponding path program 10 times [2020-08-21 21:23:24,565 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:23:24,566 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1431460066] [2020-08-21 21:23:24,566 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:23:24,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:35,357 WARN L193 SmtUtils]: Spent 177.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 8 [2020-08-21 21:23:36,476 WARN L193 SmtUtils]: Spent 881.00 ms on a formula simplification. DAG size of input: 567 DAG size of output: 11 [2020-08-21 21:23:40,820 WARN L193 SmtUtils]: Spent 3.83 s on a formula simplification. DAG size of input: 1063 DAG size of output: 8 [2020-08-21 21:24:08,978 WARN L193 SmtUtils]: Spent 27.29 s on a formula simplification. DAG size of input: 2458 DAG size of output: 8 [2020-08-21 21:24:09,326 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:24:09,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:24:09,329 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 31 [2020-08-21 21:24:09,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:24:09,337 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 99 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-21 21:24:09,337 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1431460066] [2020-08-21 21:24:09,338 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:24:09,338 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-21 21:24:09,338 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [811513518] [2020-08-21 21:24:09,339 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-21 21:24:09,339 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:24:09,339 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-21 21:24:09,339 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=201, Unknown=0, NotChecked=0, Total=240 [2020-08-21 21:24:09,339 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 16 states. [2020-08-21 21:24:09,801 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:24:09,801 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2020-08-21 21:24:09,802 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-21 21:24:09,802 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 38 [2020-08-21 21:24:09,802 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:24:09,803 INFO L225 Difference]: With dead ends: 49 [2020-08-21 21:24:09,803 INFO L226 Difference]: Without dead ends: 41 [2020-08-21 21:24:09,804 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 33.7s TimeCoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2020-08-21 21:24:09,806 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-21 21:24:09,811 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-08-21 21:24:09,811 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-21 21:24:09,812 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 42 transitions. [2020-08-21 21:24:09,813 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 42 transitions. Word has length 38 [2020-08-21 21:24:09,813 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:24:09,813 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 42 transitions. [2020-08-21 21:24:09,813 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-21 21:24:09,813 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 42 transitions. [2020-08-21 21:24:09,817 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-21 21:24:09,817 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:24:09,817 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:24:09,817 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-21 21:24:09,817 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:24:09,818 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:24:09,818 INFO L82 PathProgramCache]: Analyzing trace with hash 443458522, now seen corresponding path program 1 times [2020-08-21 21:24:09,818 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:24:09,818 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1428475049] [2020-08-21 21:24:09,819 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:24:10,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:24:14,236 WARN L193 SmtUtils]: Spent 325.00 ms on a formula simplification. DAG size of input: 180 DAG size of output: 8 [2020-08-21 21:24:15,314 WARN L193 SmtUtils]: Spent 871.00 ms on a formula simplification. DAG size of input: 401 DAG size of output: 8 [2020-08-21 21:24:19,403 WARN L193 SmtUtils]: Spent 3.66 s on a formula simplification. DAG size of input: 830 DAG size of output: 8 [2020-08-21 21:24:19,611 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 69 DAG size of output: 45 [2020-08-21 21:24:19,967 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:24:19,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:24:19,974 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 33 [2020-08-21 21:24:19,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:24:20,029 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 0 proven. 101 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-21 21:24:20,029 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1428475049] [2020-08-21 21:24:20,030 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:24:20,030 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-21 21:24:20,030 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1748750029] [2020-08-21 21:24:20,031 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-21 21:24:20,031 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:24:20,031 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-21 21:24:20,032 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=370, Unknown=0, NotChecked=0, Total=420 [2020-08-21 21:24:20,032 INFO L87 Difference]: Start difference. First operand 41 states and 42 transitions. Second operand 21 states. [2020-08-21 21:24:21,023 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:24:21,024 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2020-08-21 21:24:21,024 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-21 21:24:21,024 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 40 [2020-08-21 21:24:21,025 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:24:21,028 INFO L225 Difference]: With dead ends: 48 [2020-08-21 21:24:21,028 INFO L226 Difference]: Without dead ends: 43 [2020-08-21 21:24:21,032 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 6.4s TimeCoverageRelationStatistics Valid=94, Invalid=718, Unknown=0, NotChecked=0, Total=812 [2020-08-21 21:24:21,033 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-21 21:24:21,049 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-08-21 21:24:21,049 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-21 21:24:21,052 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 44 transitions. [2020-08-21 21:24:21,052 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 44 transitions. Word has length 40 [2020-08-21 21:24:21,052 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:24:21,053 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 44 transitions. [2020-08-21 21:24:21,053 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-21 21:24:21,053 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 44 transitions. [2020-08-21 21:24:21,053 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-21 21:24:21,053 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:24:21,054 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:24:21,054 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-21 21:24:21,054 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:24:21,054 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:24:21,054 INFO L82 PathProgramCache]: Analyzing trace with hash 1101317845, now seen corresponding path program 2 times [2020-08-21 21:24:21,059 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:24:21,059 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1305880005] [2020-08-21 21:24:21,059 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:24:21,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat