/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5 --traceabstraction.additional.smt.options interpolation-heuristic=WIDESTAMONGSMALL --traceabstraction.additional.smt.options tolerance=1.0 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/ldv-regression/test25-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-19 02:47:15,094 INFO L177 SettingsManager]: Resetting all preferences to default values... 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[2020-08-19 02:47:15,121 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-19 02:47:15,122 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-19 02:47:15,123 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-19 02:47:15,125 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-19 02:47:15,127 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-19 02:47:15,128 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-19 02:47:15,129 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-19 02:47:15,130 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-19 02:47:15,130 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-19 02:47:15,131 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-19 02:47:15,132 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-19 02:47:15,133 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-19 02:47:15,134 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-19 02:47:15,135 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-19 02:47:15,137 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-19 02:47:15,139 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-19 02:47:15,141 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-19 02:47:15,142 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-19 02:47:15,143 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-19 02:47:15,144 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-19 02:47:15,146 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-19 02:47:15,155 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-19 02:47:15,156 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-19 02:47:15,156 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-19 02:47:15,157 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 [2020-08-19 02:47:15,203 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-19 02:47:15,203 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-19 02:47:15,207 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-19 02:47:15,208 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-19 02:47:15,208 INFO L138 SettingsManager]: * Use SBE=true [2020-08-19 02:47:15,208 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-19 02:47:15,208 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-19 02:47:15,208 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-19 02:47:15,209 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-19 02:47:15,209 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-19 02:47:15,209 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-19 02:47:15,209 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-19 02:47:15,210 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-19 02:47:15,210 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-19 02:47:15,210 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-19 02:47:15,210 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-19 02:47:15,210 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-19 02:47:15,210 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-19 02:47:15,211 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-19 02:47:15,211 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-19 02:47:15,211 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-19 02:47:15,211 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-19 02:47:15,211 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-19 02:47:15,212 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-19 02:47:15,213 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-19 02:47:15,213 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-19 02:47:15,213 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-19 02:47:15,214 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-19 02:47:15,214 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-19 02:47:15,214 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=1.0; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=1.0; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=1.0; [2020-08-19 02:47:15,508 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-19 02:47:15,521 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-19 02:47:15,524 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-19 02:47:15,526 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-19 02:47:15,526 INFO L275 PluginConnector]: CDTParser initialized [2020-08-19 02:47:15,527 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-regression/test25-2.c [2020-08-19 02:47:15,590 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/6fe43f61a/98a32f17771d46108f6e643fcc7f7f8e/FLAGac129a387 [2020-08-19 02:47:16,060 INFO L306 CDTParser]: Found 1 translation units. [2020-08-19 02:47:16,061 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/ldv-regression/test25-2.c [2020-08-19 02:47:16,067 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/6fe43f61a/98a32f17771d46108f6e643fcc7f7f8e/FLAGac129a387 [2020-08-19 02:47:16,424 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/6fe43f61a/98a32f17771d46108f6e643fcc7f7f8e [2020-08-19 02:47:16,435 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-19 02:47:16,437 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-19 02:47:16,438 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-19 02:47:16,438 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-19 02:47:16,442 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-19 02:47:16,443 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 02:47:16" (1/1) ... [2020-08-19 02:47:16,446 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@326565d8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:47:16, skipping insertion in model container [2020-08-19 02:47:16,447 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 02:47:16" (1/1) ... [2020-08-19 02:47:16,455 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-19 02:47:16,473 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-19 02:47:16,667 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-19 02:47:16,677 INFO L203 MainTranslator]: Completed pre-run [2020-08-19 02:47:16,700 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-19 02:47:16,718 INFO L208 MainTranslator]: Completed translation [2020-08-19 02:47:16,718 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:47:16 WrapperNode [2020-08-19 02:47:16,718 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-19 02:47:16,719 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-19 02:47:16,719 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-19 02:47:16,719 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-19 02:47:16,818 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:47:16" (1/1) ... [2020-08-19 02:47:16,820 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:47:16" (1/1) ... [2020-08-19 02:47:16,829 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:47:16" (1/1) ... [2020-08-19 02:47:16,830 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:47:16" (1/1) ... [2020-08-19 02:47:16,850 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:47:16" (1/1) ... [2020-08-19 02:47:16,854 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:47:16" (1/1) ... [2020-08-19 02:47:16,856 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:47:16" (1/1) ... [2020-08-19 02:47:16,858 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-19 02:47:16,859 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-19 02:47:16,859 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-19 02:47:16,859 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-19 02:47:16,860 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:47:16" (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 [2020-08-19 02:47:16,934 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-19 02:47:16,934 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-19 02:47:16,935 INFO L138 BoogieDeclarations]: Found implementation of procedure check [2020-08-19 02:47:16,935 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-19 02:47:16,935 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-19 02:47:16,935 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-19 02:47:16,936 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-08-19 02:47:16,936 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-08-19 02:47:16,936 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-19 02:47:16,936 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-19 02:47:16,937 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-19 02:47:16,937 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-19 02:47:16,937 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-08-19 02:47:16,937 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-19 02:47:16,937 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-19 02:47:16,938 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-19 02:47:17,284 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-19 02:47:17,284 INFO L295 CfgBuilder]: Removed 2 assume(true) statements. [2020-08-19 02:47:17,288 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 02:47:17 BoogieIcfgContainer [2020-08-19 02:47:17,288 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-19 02:47:17,289 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-19 02:47:17,289 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-19 02:47:17,293 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-19 02:47:17,293 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.08 02:47:16" (1/3) ... [2020-08-19 02:47:17,294 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@cd4ac2a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 02:47:17, skipping insertion in model container [2020-08-19 02:47:17,294 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:47:16" (2/3) ... [2020-08-19 02:47:17,294 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@cd4ac2a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 02:47:17, skipping insertion in model container [2020-08-19 02:47:17,295 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 02:47:17" (3/3) ... [2020-08-19 02:47:17,296 INFO L109 eAbstractionObserver]: Analyzing ICFG test25-2.c [2020-08-19 02:47:17,306 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-19 02:47:17,312 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-19 02:47:17,323 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-19 02:47:17,344 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-19 02:47:17,344 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-19 02:47:17,344 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-19 02:47:17,345 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-19 02:47:17,345 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-19 02:47:17,345 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-19 02:47:17,345 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-19 02:47:17,345 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-19 02:47:17,364 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states. [2020-08-19 02:47:17,368 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-19 02:47:17,369 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:47:17,370 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:47:17,370 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:47:17,374 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:47:17,375 INFO L82 PathProgramCache]: Analyzing trace with hash -899836778, now seen corresponding path program 1 times [2020-08-19 02:47:17,382 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:47:17,382 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1578365172] [2020-08-19 02:47:17,383 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:47:17,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:47:17,555 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:47:17,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:47:17,572 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-19 02:47:17,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:47:17,587 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:47:17,588 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1578365172] [2020-08-19 02:47:17,590 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 02:47:17,591 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-19 02:47:17,593 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1742085674] [2020-08-19 02:47:17,599 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-19 02:47:17,599 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:47:17,609 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-19 02:47:17,610 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-19 02:47:17,612 INFO L87 Difference]: Start difference. First operand 25 states. Second operand 3 states. [2020-08-19 02:47:17,719 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:47:17,719 INFO L93 Difference]: Finished difference Result 42 states and 52 transitions. [2020-08-19 02:47:17,720 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-19 02:47:17,721 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2020-08-19 02:47:17,722 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:47:17,730 INFO L225 Difference]: With dead ends: 42 [2020-08-19 02:47:17,731 INFO L226 Difference]: Without dead ends: 20 [2020-08-19 02:47:17,734 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 [2020-08-19 02:47:17,749 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-19 02:47:17,763 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-19 02:47:17,765 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-19 02:47:17,766 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2020-08-19 02:47:17,767 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 17 [2020-08-19 02:47:17,767 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:47:17,768 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2020-08-19 02:47:17,768 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-19 02:47:17,768 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2020-08-19 02:47:17,769 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-19 02:47:17,769 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:47:17,769 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:47:17,770 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-19 02:47:17,770 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:47:17,770 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:47:17,771 INFO L82 PathProgramCache]: Analyzing trace with hash -1137678901, now seen corresponding path program 1 times [2020-08-19 02:47:17,771 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:47:17,772 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1253159579] [2020-08-19 02:47:17,772 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:47:17,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:47:17,878 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:47:17,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:47:17,887 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-08-19 02:47:17,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:47:17,903 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:47:17,904 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1253159579] [2020-08-19 02:47:17,904 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 02:47:17,904 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-19 02:47:17,905 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [631529884] [2020-08-19 02:47:17,906 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-19 02:47:17,907 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:47:17,907 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-19 02:47:17,907 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-19 02:47:17,908 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand 4 states. [2020-08-19 02:47:17,990 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:47:17,990 INFO L93 Difference]: Finished difference Result 34 states and 36 transitions. [2020-08-19 02:47:17,990 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-19 02:47:17,991 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 18 [2020-08-19 02:47:17,991 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:47:17,992 INFO L225 Difference]: With dead ends: 34 [2020-08-19 02:47:17,992 INFO L226 Difference]: Without dead ends: 22 [2020-08-19 02:47:17,993 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 [2020-08-19 02:47:17,994 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-19 02:47:18,001 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2020-08-19 02:47:18,001 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-19 02:47:18,002 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2020-08-19 02:47:18,003 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 18 [2020-08-19 02:47:18,003 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:47:18,003 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2020-08-19 02:47:18,004 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-19 02:47:18,005 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2020-08-19 02:47:18,006 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-19 02:47:18,006 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:47:18,006 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] [2020-08-19 02:47:18,006 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-19 02:47:18,007 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:47:18,007 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:47:18,008 INFO L82 PathProgramCache]: Analyzing trace with hash 278779309, now seen corresponding path program 1 times [2020-08-19 02:47:18,012 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:47:18,012 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1817333111] [2020-08-19 02:47:18,013 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:47:18,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:47:18,109 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:47:18,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:47:18,114 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2020-08-19 02:47:18,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:47:18,120 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:47:18,121 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1817333111] [2020-08-19 02:47:18,121 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:47:18,121 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-19 02:47:18,122 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [728629657] [2020-08-19 02:47:18,122 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-19 02:47:18,122 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:47:18,123 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-19 02:47:18,123 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-19 02:47:18,123 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 5 states. [2020-08-19 02:47:18,205 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:47:18,205 INFO L93 Difference]: Finished difference Result 36 states and 38 transitions. [2020-08-19 02:47:18,206 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-19 02:47:18,206 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 20 [2020-08-19 02:47:18,206 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:47:18,207 INFO L225 Difference]: With dead ends: 36 [2020-08-19 02:47:18,207 INFO L226 Difference]: Without dead ends: 24 [2020-08-19 02:47:18,210 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 [2020-08-19 02:47:18,211 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-19 02:47:18,217 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2020-08-19 02:47:18,217 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-19 02:47:18,219 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2020-08-19 02:47:18,220 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 20 [2020-08-19 02:47:18,220 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:47:18,220 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2020-08-19 02:47:18,220 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-19 02:47:18,220 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2020-08-19 02:47:18,222 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-19 02:47:18,223 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:47:18,223 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] [2020-08-19 02:47:18,223 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-19 02:47:18,223 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:47:18,225 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:47:18,226 INFO L82 PathProgramCache]: Analyzing trace with hash -9513713, now seen corresponding path program 2 times [2020-08-19 02:47:18,226 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:47:18,227 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1287286305] [2020-08-19 02:47:18,227 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:47:18,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:47:18,357 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:47:18,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:47:18,361 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2020-08-19 02:47:18,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:47:18,368 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:47:18,368 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1287286305] [2020-08-19 02:47:18,368 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:47:18,369 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-19 02:47:18,369 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [245535184] [2020-08-19 02:47:18,370 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-19 02:47:18,370 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:47:18,370 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-19 02:47:18,371 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-19 02:47:18,371 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand 6 states. [2020-08-19 02:47:18,473 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:47:18,473 INFO L93 Difference]: Finished difference Result 38 states and 40 transitions. [2020-08-19 02:47:18,473 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-19 02:47:18,474 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 22 [2020-08-19 02:47:18,474 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:47:18,474 INFO L225 Difference]: With dead ends: 38 [2020-08-19 02:47:18,475 INFO L226 Difference]: Without dead ends: 26 [2020-08-19 02:47:18,475 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 [2020-08-19 02:47:18,476 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-19 02:47:18,480 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2020-08-19 02:47:18,481 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-19 02:47:18,482 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 26 transitions. [2020-08-19 02:47:18,482 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 26 transitions. Word has length 22 [2020-08-19 02:47:18,482 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:47:18,482 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 26 transitions. [2020-08-19 02:47:18,482 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-19 02:47:18,483 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 26 transitions. [2020-08-19 02:47:18,483 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-19 02:47:18,483 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:47:18,484 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] [2020-08-19 02:47:18,484 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-19 02:47:18,484 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:47:18,484 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:47:18,485 INFO L82 PathProgramCache]: Analyzing trace with hash 2113766385, now seen corresponding path program 3 times [2020-08-19 02:47:18,485 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:47:18,485 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [894412971] [2020-08-19 02:47:18,486 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:47:18,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:47:18,569 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:47:18,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:47:18,577 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2020-08-19 02:47:18,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:47:18,585 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:47:18,585 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [894412971] [2020-08-19 02:47:18,586 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:47:18,586 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-19 02:47:18,587 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [744222145] [2020-08-19 02:47:18,588 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-19 02:47:18,588 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:47:18,588 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-19 02:47:18,589 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-08-19 02:47:18,589 INFO L87 Difference]: Start difference. First operand 25 states and 26 transitions. Second operand 7 states. [2020-08-19 02:47:18,657 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:47:18,658 INFO L93 Difference]: Finished difference Result 40 states and 42 transitions. [2020-08-19 02:47:18,658 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-19 02:47:18,658 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 24 [2020-08-19 02:47:18,659 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:47:18,659 INFO L225 Difference]: With dead ends: 40 [2020-08-19 02:47:18,660 INFO L226 Difference]: Without dead ends: 28 [2020-08-19 02:47:18,660 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 [2020-08-19 02:47:18,661 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-19 02:47:18,665 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2020-08-19 02:47:18,665 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-19 02:47:18,666 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2020-08-19 02:47:18,666 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 24 [2020-08-19 02:47:18,666 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:47:18,667 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2020-08-19 02:47:18,667 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-19 02:47:18,667 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2020-08-19 02:47:18,668 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-19 02:47:18,668 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:47:18,668 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] [2020-08-19 02:47:18,668 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-19 02:47:18,669 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:47:18,669 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:47:18,669 INFO L82 PathProgramCache]: Analyzing trace with hash -1818492333, now seen corresponding path program 4 times [2020-08-19 02:47:18,669 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:47:18,670 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [465946133] [2020-08-19 02:47:18,670 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:47:18,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:47:18,800 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:47:18,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:47:18,806 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2020-08-19 02:47:18,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:47:18,817 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:47:18,818 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [465946133] [2020-08-19 02:47:18,819 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:47:18,819 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-19 02:47:18,820 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1227637888] [2020-08-19 02:47:18,820 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-19 02:47:18,828 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:47:18,828 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-19 02:47:18,829 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-08-19 02:47:18,829 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 8 states. [2020-08-19 02:47:18,918 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:47:18,918 INFO L93 Difference]: Finished difference Result 42 states and 44 transitions. [2020-08-19 02:47:18,919 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-19 02:47:18,919 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 26 [2020-08-19 02:47:18,919 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:47:18,920 INFO L225 Difference]: With dead ends: 42 [2020-08-19 02:47:18,920 INFO L226 Difference]: Without dead ends: 30 [2020-08-19 02:47:18,920 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 [2020-08-19 02:47:18,921 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-19 02:47:18,928 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2020-08-19 02:47:18,928 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-19 02:47:18,932 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 30 transitions. [2020-08-19 02:47:18,933 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 30 transitions. Word has length 26 [2020-08-19 02:47:18,933 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:47:18,933 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 30 transitions. [2020-08-19 02:47:18,933 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-19 02:47:18,933 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 30 transitions. [2020-08-19 02:47:18,934 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-19 02:47:18,934 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:47:18,934 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] [2020-08-19 02:47:18,935 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-19 02:47:18,935 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:47:18,935 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:47:18,935 INFO L82 PathProgramCache]: Analyzing trace with hash -1147899851, now seen corresponding path program 5 times [2020-08-19 02:47:18,935 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:47:18,936 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [290689591] [2020-08-19 02:47:18,936 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:47:18,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:47:19,080 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:47:19,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:47:19,084 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2020-08-19 02:47:19,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:47:19,094 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:47:19,095 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [290689591] [2020-08-19 02:47:19,095 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:47:19,095 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-19 02:47:19,095 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [651971391] [2020-08-19 02:47:19,096 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-19 02:47:19,096 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:47:19,097 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-19 02:47:19,097 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2020-08-19 02:47:19,098 INFO L87 Difference]: Start difference. First operand 29 states and 30 transitions. Second operand 9 states. [2020-08-19 02:47:19,209 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:47:19,209 INFO L93 Difference]: Finished difference Result 44 states and 46 transitions. [2020-08-19 02:47:19,210 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-19 02:47:19,210 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 28 [2020-08-19 02:47:19,210 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:47:19,211 INFO L225 Difference]: With dead ends: 44 [2020-08-19 02:47:19,211 INFO L226 Difference]: Without dead ends: 32 [2020-08-19 02:47:19,212 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 [2020-08-19 02:47:19,213 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-19 02:47:19,218 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2020-08-19 02:47:19,219 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-19 02:47:19,219 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 32 transitions. [2020-08-19 02:47:19,221 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 32 transitions. Word has length 28 [2020-08-19 02:47:19,221 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:47:19,221 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 32 transitions. [2020-08-19 02:47:19,221 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-19 02:47:19,221 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 32 transitions. [2020-08-19 02:47:19,225 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-19 02:47:19,225 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:47:19,225 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] [2020-08-19 02:47:19,225 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-19 02:47:19,226 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:47:19,226 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:47:19,226 INFO L82 PathProgramCache]: Analyzing trace with hash -953619049, now seen corresponding path program 6 times [2020-08-19 02:47:19,226 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:47:19,227 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1674075217] [2020-08-19 02:47:19,227 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:47:19,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:47:19,356 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:47:19,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:47:19,360 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-08-19 02:47:19,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:47:19,368 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:47:19,369 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1674075217] [2020-08-19 02:47:19,369 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:47:19,369 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-19 02:47:19,369 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [257721062] [2020-08-19 02:47:19,370 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-19 02:47:19,370 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:47:19,370 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-19 02:47:19,371 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2020-08-19 02:47:19,371 INFO L87 Difference]: Start difference. First operand 31 states and 32 transitions. Second operand 10 states. [2020-08-19 02:47:19,476 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:47:19,477 INFO L93 Difference]: Finished difference Result 46 states and 48 transitions. [2020-08-19 02:47:19,477 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-19 02:47:19,477 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 30 [2020-08-19 02:47:19,478 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:47:19,479 INFO L225 Difference]: With dead ends: 46 [2020-08-19 02:47:19,479 INFO L226 Difference]: Without dead ends: 34 [2020-08-19 02:47:19,480 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 [2020-08-19 02:47:19,481 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-19 02:47:19,490 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2020-08-19 02:47:19,490 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-19 02:47:19,492 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2020-08-19 02:47:19,492 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 30 [2020-08-19 02:47:19,493 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:47:19,493 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2020-08-19 02:47:19,493 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-19 02:47:19,493 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2020-08-19 02:47:19,495 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-19 02:47:19,495 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:47:19,496 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] [2020-08-19 02:47:19,496 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-19 02:47:19,496 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:47:19,496 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:47:19,497 INFO L82 PathProgramCache]: Analyzing trace with hash 1066637945, now seen corresponding path program 7 times [2020-08-19 02:47:19,497 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:47:19,497 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1604180926] [2020-08-19 02:47:19,498 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:47:19,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:47:19,646 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:47:19,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:47:19,650 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2020-08-19 02:47:19,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:47:19,658 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:47:19,658 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1604180926] [2020-08-19 02:47:19,659 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:47:19,659 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-19 02:47:19,663 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [142846737] [2020-08-19 02:47:19,664 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-19 02:47:19,664 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:47:19,665 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-19 02:47:19,669 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2020-08-19 02:47:19,669 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 11 states. [2020-08-19 02:47:19,793 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:47:19,793 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2020-08-19 02:47:19,794 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-19 02:47:19,794 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 32 [2020-08-19 02:47:19,794 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:47:19,795 INFO L225 Difference]: With dead ends: 48 [2020-08-19 02:47:19,795 INFO L226 Difference]: Without dead ends: 36 [2020-08-19 02:47:19,795 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 [2020-08-19 02:47:19,796 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-19 02:47:19,800 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2020-08-19 02:47:19,800 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-19 02:47:19,800 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 36 transitions. [2020-08-19 02:47:19,801 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 36 transitions. Word has length 32 [2020-08-19 02:47:19,801 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:47:19,801 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 36 transitions. [2020-08-19 02:47:19,801 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-19 02:47:19,801 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 36 transitions. [2020-08-19 02:47:19,802 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-19 02:47:19,802 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:47:19,802 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] [2020-08-19 02:47:19,802 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-19 02:47:19,803 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:47:19,803 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:47:19,803 INFO L82 PathProgramCache]: Analyzing trace with hash 1208391387, now seen corresponding path program 8 times [2020-08-19 02:47:19,803 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:47:19,804 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [376481710] [2020-08-19 02:47:19,804 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:47:19,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:47:19,917 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:47:19,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:47:19,920 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2020-08-19 02:47:19,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:47:19,925 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:47:19,926 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [376481710] [2020-08-19 02:47:19,926 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:47:19,926 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-19 02:47:19,926 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1873752199] [2020-08-19 02:47:19,927 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-19 02:47:19,927 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:47:19,927 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-19 02:47:19,927 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2020-08-19 02:47:19,928 INFO L87 Difference]: Start difference. First operand 35 states and 36 transitions. Second operand 12 states. [2020-08-19 02:47:20,017 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:47:20,017 INFO L93 Difference]: Finished difference Result 50 states and 52 transitions. [2020-08-19 02:47:20,017 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-19 02:47:20,017 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 34 [2020-08-19 02:47:20,018 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:47:20,018 INFO L225 Difference]: With dead ends: 50 [2020-08-19 02:47:20,019 INFO L226 Difference]: Without dead ends: 38 [2020-08-19 02:47:20,019 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 [2020-08-19 02:47:20,020 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-19 02:47:20,023 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2020-08-19 02:47:20,024 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-19 02:47:20,024 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 38 transitions. [2020-08-19 02:47:20,024 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 38 transitions. Word has length 34 [2020-08-19 02:47:20,025 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:47:20,025 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 38 transitions. [2020-08-19 02:47:20,025 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-19 02:47:20,025 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 38 transitions. [2020-08-19 02:47:20,026 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-19 02:47:20,026 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:47:20,026 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] [2020-08-19 02:47:20,026 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-19 02:47:20,026 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:47:20,027 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:47:20,027 INFO L82 PathProgramCache]: Analyzing trace with hash -5504323, now seen corresponding path program 9 times [2020-08-19 02:47:20,027 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:47:20,027 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [604247799] [2020-08-19 02:47:20,028 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:47:20,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:47:20,155 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:47:20,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:47:20,157 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2020-08-19 02:47:20,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:47:20,163 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:47:20,163 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [604247799] [2020-08-19 02:47:20,163 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:47:20,164 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-19 02:47:20,164 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [14378442] [2020-08-19 02:47:20,164 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-19 02:47:20,164 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:47:20,165 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-19 02:47:20,165 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2020-08-19 02:47:20,165 INFO L87 Difference]: Start difference. First operand 37 states and 38 transitions. Second operand 13 states. [2020-08-19 02:47:20,266 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:47:20,266 INFO L93 Difference]: Finished difference Result 51 states and 53 transitions. [2020-08-19 02:47:20,267 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-19 02:47:20,267 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 36 [2020-08-19 02:47:20,267 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:47:20,268 INFO L225 Difference]: With dead ends: 51 [2020-08-19 02:47:20,268 INFO L226 Difference]: Without dead ends: 39 [2020-08-19 02:47:20,269 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 [2020-08-19 02:47:20,269 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-19 02:47:20,279 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-08-19 02:47:20,279 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-19 02:47:20,282 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2020-08-19 02:47:20,282 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 36 [2020-08-19 02:47:20,282 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:47:20,282 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2020-08-19 02:47:20,282 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-19 02:47:20,283 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2020-08-19 02:47:20,285 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-19 02:47:20,285 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:47:20,285 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] [2020-08-19 02:47:20,285 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-19 02:47:20,285 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:47:20,286 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:47:20,286 INFO L82 PathProgramCache]: Analyzing trace with hash 1671822879, now seen corresponding path program 10 times [2020-08-19 02:47:20,287 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:47:20,287 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1419268794] [2020-08-19 02:47:20,287 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:47:20,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:47:30,313 WARN L193 SmtUtils]: Spent 176.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 8 [2020-08-19 02:47:31,329 WARN L193 SmtUtils]: Spent 806.00 ms on a formula simplification. DAG size of input: 567 DAG size of output: 11 [2020-08-19 02:47:35,484 WARN L193 SmtUtils]: Spent 3.69 s on a formula simplification. DAG size of input: 1063 DAG size of output: 8 [2020-08-19 02:48:03,454 WARN L193 SmtUtils]: Spent 27.10 s on a formula simplification. DAG size of input: 2458 DAG size of output: 8 [2020-08-19 02:48:03,736 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 31 [2020-08-19 02:48:03,816 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:48:03,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:48:03,819 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 31 [2020-08-19 02:48:03,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:48:03,831 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 99 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-19 02:48:03,832 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1419268794] [2020-08-19 02:48:03,832 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:48:03,832 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-19 02:48:03,833 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [916960194] [2020-08-19 02:48:03,834 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-19 02:48:03,834 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:48:03,834 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-19 02:48:03,835 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=201, Unknown=0, NotChecked=0, Total=240 [2020-08-19 02:48:03,835 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 16 states. [2020-08-19 02:48:04,311 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:48:04,311 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2020-08-19 02:48:04,312 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-19 02:48:04,312 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 38 [2020-08-19 02:48:04,313 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:48:04,313 INFO L225 Difference]: With dead ends: 49 [2020-08-19 02:48:04,314 INFO L226 Difference]: Without dead ends: 41 [2020-08-19 02:48:04,314 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 33.3s TimeCoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2020-08-19 02:48:04,315 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-19 02:48:04,326 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-08-19 02:48:04,326 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-19 02:48:04,327 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 42 transitions. [2020-08-19 02:48:04,327 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 42 transitions. Word has length 38 [2020-08-19 02:48:04,328 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:48:04,328 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 42 transitions. [2020-08-19 02:48:04,328 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-19 02:48:04,328 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 42 transitions. [2020-08-19 02:48:04,331 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-19 02:48:04,332 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:48:04,332 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] [2020-08-19 02:48:04,332 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-19 02:48:04,332 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:48:04,333 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:48:04,333 INFO L82 PathProgramCache]: Analyzing trace with hash 443458522, now seen corresponding path program 1 times [2020-08-19 02:48:04,333 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:48:04,333 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2019713481] [2020-08-19 02:48:04,333 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:48:04,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:48:08,491 WARN L193 SmtUtils]: Spent 441.00 ms on a formula simplification. DAG size of input: 180 DAG size of output: 8 [2020-08-19 02:48:09,554 WARN L193 SmtUtils]: Spent 868.00 ms on a formula simplification. DAG size of input: 401 DAG size of output: 8 [2020-08-19 02:48:13,526 WARN L193 SmtUtils]: Spent 3.64 s on a formula simplification. DAG size of input: 830 DAG size of output: 8 [2020-08-19 02:48:14,076 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:48:14,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:48:14,090 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 33 [2020-08-19 02:48:14,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:48:14,149 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 0 proven. 101 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-19 02:48:14,150 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2019713481] [2020-08-19 02:48:14,150 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:48:14,150 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-19 02:48:14,156 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [386671936] [2020-08-19 02:48:14,156 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-19 02:48:14,156 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:48:14,157 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-19 02:48:14,157 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=370, Unknown=0, NotChecked=0, Total=420 [2020-08-19 02:48:14,157 INFO L87 Difference]: Start difference. First operand 41 states and 42 transitions. Second operand 21 states. [2020-08-19 02:48:15,137 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:48:15,138 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2020-08-19 02:48:15,138 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-19 02:48:15,139 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 40 [2020-08-19 02:48:15,139 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:48:15,141 INFO L225 Difference]: With dead ends: 48 [2020-08-19 02:48:15,141 INFO L226 Difference]: Without dead ends: 43 [2020-08-19 02:48:15,142 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=94, Invalid=718, Unknown=0, NotChecked=0, Total=812 [2020-08-19 02:48:15,142 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-19 02:48:15,151 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-08-19 02:48:15,152 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-19 02:48:15,154 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 44 transitions. [2020-08-19 02:48:15,154 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 44 transitions. Word has length 40 [2020-08-19 02:48:15,155 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:48:15,155 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 44 transitions. [2020-08-19 02:48:15,155 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-19 02:48:15,155 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 44 transitions. [2020-08-19 02:48:15,156 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-19 02:48:15,156 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:48:15,156 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] [2020-08-19 02:48:15,156 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-19 02:48:15,156 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:48:15,157 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:48:15,160 INFO L82 PathProgramCache]: Analyzing trace with hash 1101317845, now seen corresponding path program 2 times [2020-08-19 02:48:15,160 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:48:15,160 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2037650018] [2020-08-19 02:48:15,161 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:48:15,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat