/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=HIGHLEXORDER --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/test24-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 18:58:04,941 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 18:58:04,945 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 18:58:04,971 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 18:58:04,971 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 18:58:04,972 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 18:58:04,974 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 18:58:04,975 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 18:58:04,977 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 18:58:04,978 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 18:58:04,979 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 18:58:04,980 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 18:58:04,980 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 18:58:04,981 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 18:58:04,982 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 18:58:04,983 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 18:58:04,984 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 18:58:04,985 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 18:58:04,987 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 18:58:04,989 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 18:58:04,990 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 18:58:04,991 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 18:58:04,993 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 18:58:04,994 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 18:58:04,996 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-21 18:58:05,006 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 18:58:05,007 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 18:58:05,008 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 18:58:05,009 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 18:58:05,032 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 18:58:05,032 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 18:58:05,034 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 18:58:05,034 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 18:58:05,034 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 18:58:05,034 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 18:58:05,035 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 18:58:05,035 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 18:58:05,035 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 18:58:05,035 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 18:58:05,035 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 18:58:05,036 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 18:58:05,036 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 18:58:05,036 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 18:58:05,036 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 18:58:05,036 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 18:58:05,037 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 18:58:05,037 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 18:58:05,037 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 18:58:05,037 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 18:58:05,037 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 18:58:05,038 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 18:58:05,038 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 18:58:05,038 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 18:58:05,038 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 18:58:05,039 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 18:58:05,039 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 18:58:05,039 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 18:58:05,039 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 18:58:05,039 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=HIGHLEXORDER;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=HIGHLEXORDER;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=HIGHLEXORDER;log-additional-information=true; [2020-08-21 18:58:05,345 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 18:58:05,358 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 18:58:05,361 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 18:58:05,363 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 18:58:05,363 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 18:58:05,364 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-regression/test24-2.c [2020-08-21 18:58:05,428 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/18bc2bdbc/c3d1d086a08345b7b6e5d3d54ce652b7/FLAG4a532f802 [2020-08-21 18:58:05,840 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 18:58:05,841 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/ldv-regression/test24-2.c [2020-08-21 18:58:05,847 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/18bc2bdbc/c3d1d086a08345b7b6e5d3d54ce652b7/FLAG4a532f802 [2020-08-21 18:58:06,261 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/18bc2bdbc/c3d1d086a08345b7b6e5d3d54ce652b7 [2020-08-21 18:58:06,270 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 18:58:06,272 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 18:58:06,273 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 18:58:06,273 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 18:58:06,276 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 18:58:06,278 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 06:58:06" (1/1) ... [2020-08-21 18:58:06,281 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7d78f5d6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:58:06, skipping insertion in model container [2020-08-21 18:58:06,281 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 06:58:06" (1/1) ... [2020-08-21 18:58:06,289 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 18:58:06,309 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 18:58:06,503 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 18:58:06,511 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 18:58:06,531 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 18:58:06,628 INFO L208 MainTranslator]: Completed translation [2020-08-21 18:58:06,629 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:58:06 WrapperNode [2020-08-21 18:58:06,629 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 18:58:06,630 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 18:58:06,630 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 18:58:06,630 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 18:58:06,644 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:58:06" (1/1) ... [2020-08-21 18:58:06,644 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:58:06" (1/1) ... [2020-08-21 18:58:06,653 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:58:06" (1/1) ... [2020-08-21 18:58:06,653 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:58:06" (1/1) ... [2020-08-21 18:58:06,661 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:58:06" (1/1) ... [2020-08-21 18:58:06,666 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:58:06" (1/1) ... [2020-08-21 18:58:06,667 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:58:06" (1/1) ... [2020-08-21 18:58:06,670 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 18:58:06,670 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 18:58:06,670 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 18:58:06,671 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 18:58:06,671 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:58:06" (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 18:58:06,739 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 18:58:06,739 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 18:58:06,739 INFO L138 BoogieDeclarations]: Found implementation of procedure check [2020-08-21 18:58:06,739 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 18:58:06,740 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 18:58:06,740 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-21 18:58:06,740 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-08-21 18:58:06,740 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-21 18:58:06,740 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 18:58:06,741 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-21 18:58:06,741 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-21 18:58:06,741 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-21 18:58:06,741 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 18:58:06,741 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 18:58:07,021 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 18:58:07,021 INFO L295 CfgBuilder]: Removed 2 assume(true) statements. [2020-08-21 18:58:07,026 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 06:58:07 BoogieIcfgContainer [2020-08-21 18:58:07,027 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 18:58:07,032 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 18:58:07,032 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 18:58:07,039 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 18:58:07,040 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 06:58:06" (1/3) ... [2020-08-21 18:58:07,041 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@66d70de2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 06:58:07, skipping insertion in model container [2020-08-21 18:58:07,041 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:58:06" (2/3) ... [2020-08-21 18:58:07,041 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@66d70de2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 06:58:07, skipping insertion in model container [2020-08-21 18:58:07,042 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 06:58:07" (3/3) ... [2020-08-21 18:58:07,044 INFO L109 eAbstractionObserver]: Analyzing ICFG test24-2.c [2020-08-21 18:58:07,056 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 18:58:07,063 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 18:58:07,077 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 18:58:07,104 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 18:58:07,104 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 18:58:07,105 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 18:58:07,105 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 18:58:07,105 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 18:58:07,105 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 18:58:07,105 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 18:58:07,105 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 18:58:07,123 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states. [2020-08-21 18:58:07,130 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-21 18:58:07,130 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:58:07,131 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 18:58:07,131 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:58:07,137 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:58:07,137 INFO L82 PathProgramCache]: Analyzing trace with hash 855240046, now seen corresponding path program 1 times [2020-08-21 18:58:07,144 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:58:07,145 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1910706655] [2020-08-21 18:58:07,145 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:58:07,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:58:07,310 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:58:07,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:58:07,321 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-21 18:58:07,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:58:07,336 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 18:58:07,337 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1910706655] [2020-08-21 18:58:07,339 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 18:58:07,340 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-21 18:58:07,341 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [70396118] [2020-08-21 18:58:07,346 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-21 18:58:07,347 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:58:07,361 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-21 18:58:07,362 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 18:58:07,364 INFO L87 Difference]: Start difference. First operand 25 states. Second operand 3 states. [2020-08-21 18:58:07,466 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:58:07,467 INFO L93 Difference]: Finished difference Result 42 states and 50 transitions. [2020-08-21 18:58:07,467 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 18:58:07,469 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2020-08-21 18:58:07,469 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:58:07,479 INFO L225 Difference]: With dead ends: 42 [2020-08-21 18:58:07,480 INFO L226 Difference]: Without dead ends: 20 [2020-08-21 18:58:07,484 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 18:58:07,504 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-21 18:58:07,522 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-21 18:58:07,524 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-21 18:58:07,525 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2020-08-21 18:58:07,527 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 17 [2020-08-21 18:58:07,527 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:58:07,527 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2020-08-21 18:58:07,527 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-21 18:58:07,528 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2020-08-21 18:58:07,529 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-21 18:58:07,529 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:58:07,529 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 18:58:07,530 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 18:58:07,530 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:58:07,530 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:58:07,531 INFO L82 PathProgramCache]: Analyzing trace with hash -1631497781, now seen corresponding path program 1 times [2020-08-21 18:58:07,531 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:58:07,531 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1238827949] [2020-08-21 18:58:07,533 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:58:07,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:58:07,596 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:58:07,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:58:07,606 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-08-21 18:58:07,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:58:07,617 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 18:58:07,617 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1238827949] [2020-08-21 18:58:07,617 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 18:58:07,618 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-21 18:58:07,618 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [775481293] [2020-08-21 18:58:07,620 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 18:58:07,620 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:58:07,620 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 18:58:07,621 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 18:58:07,621 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand 4 states. [2020-08-21 18:58:07,683 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:58:07,683 INFO L93 Difference]: Finished difference Result 34 states and 36 transitions. [2020-08-21 18:58:07,684 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-21 18:58:07,684 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 18 [2020-08-21 18:58:07,684 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:58:07,685 INFO L225 Difference]: With dead ends: 34 [2020-08-21 18:58:07,685 INFO L226 Difference]: Without dead ends: 22 [2020-08-21 18:58:07,686 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 18:58:07,686 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-21 18:58:07,690 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2020-08-21 18:58:07,691 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-21 18:58:07,692 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2020-08-21 18:58:07,692 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 18 [2020-08-21 18:58:07,692 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:58:07,692 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2020-08-21 18:58:07,693 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 18:58:07,693 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2020-08-21 18:58:07,693 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-21 18:58:07,694 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:58:07,694 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 18:58:07,694 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 18:58:07,694 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:58:07,695 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:58:07,695 INFO L82 PathProgramCache]: Analyzing trace with hash 1934775405, now seen corresponding path program 1 times [2020-08-21 18:58:07,695 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:58:07,696 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [213608497] [2020-08-21 18:58:07,696 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:58:07,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:58:07,784 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:58:07,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:58:07,790 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2020-08-21 18:58:07,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:58:07,799 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 18:58:07,799 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [213608497] [2020-08-21 18:58:07,799 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:58:07,800 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-21 18:58:07,800 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [142598480] [2020-08-21 18:58:07,800 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 18:58:07,801 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:58:07,801 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 18:58:07,801 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-21 18:58:07,801 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 5 states. [2020-08-21 18:58:07,891 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:58:07,892 INFO L93 Difference]: Finished difference Result 36 states and 38 transitions. [2020-08-21 18:58:07,892 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 18:58:07,892 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 20 [2020-08-21 18:58:07,893 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:58:07,893 INFO L225 Difference]: With dead ends: 36 [2020-08-21 18:58:07,893 INFO L226 Difference]: Without dead ends: 24 [2020-08-21 18:58:07,894 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 18:58:07,895 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-21 18:58:07,899 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2020-08-21 18:58:07,899 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-21 18:58:07,900 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2020-08-21 18:58:07,901 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 20 [2020-08-21 18:58:07,901 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:58:07,901 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2020-08-21 18:58:07,901 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 18:58:07,901 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2020-08-21 18:58:07,902 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-21 18:58:07,902 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:58:07,902 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 18:58:07,903 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 18:58:07,903 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:58:07,903 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:58:07,904 INFO L82 PathProgramCache]: Analyzing trace with hash 1739404943, now seen corresponding path program 2 times [2020-08-21 18:58:07,904 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:58:07,904 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1815849885] [2020-08-21 18:58:07,904 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:58:07,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:58:07,980 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:58:07,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:58:07,986 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2020-08-21 18:58:07,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:58:07,994 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 18:58:07,994 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1815849885] [2020-08-21 18:58:07,995 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:58:07,995 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-21 18:58:07,995 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1311395442] [2020-08-21 18:58:07,996 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 18:58:07,996 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:58:07,996 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 18:58:07,997 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-21 18:58:07,997 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand 6 states. [2020-08-21 18:58:08,067 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:58:08,067 INFO L93 Difference]: Finished difference Result 38 states and 40 transitions. [2020-08-21 18:58:08,068 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 18:58:08,068 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 22 [2020-08-21 18:58:08,068 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:58:08,069 INFO L225 Difference]: With dead ends: 38 [2020-08-21 18:58:08,069 INFO L226 Difference]: Without dead ends: 26 [2020-08-21 18:58:08,070 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 18:58:08,071 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-21 18:58:08,075 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2020-08-21 18:58:08,075 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-21 18:58:08,076 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 26 transitions. [2020-08-21 18:58:08,077 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 26 transitions. Word has length 22 [2020-08-21 18:58:08,077 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:58:08,077 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 26 transitions. [2020-08-21 18:58:08,077 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 18:58:08,077 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 26 transitions. [2020-08-21 18:58:08,078 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-21 18:58:08,079 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:58:08,079 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 18:58:08,079 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 18:58:08,079 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:58:08,080 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:58:08,080 INFO L82 PathProgramCache]: Analyzing trace with hash -1328015311, now seen corresponding path program 3 times [2020-08-21 18:58:08,080 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:58:08,081 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [392292751] [2020-08-21 18:58:08,081 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:58:08,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:58:08,195 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:58:08,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:58:08,199 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2020-08-21 18:58:08,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:58:08,206 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 18:58:08,206 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [392292751] [2020-08-21 18:58:08,206 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:58:08,207 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 18:58:08,207 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1806570222] [2020-08-21 18:58:08,207 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 18:58:08,208 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:58:08,208 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 18:58:08,208 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-08-21 18:58:08,208 INFO L87 Difference]: Start difference. First operand 25 states and 26 transitions. Second operand 7 states. [2020-08-21 18:58:08,271 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:58:08,271 INFO L93 Difference]: Finished difference Result 40 states and 42 transitions. [2020-08-21 18:58:08,272 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 18:58:08,272 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 24 [2020-08-21 18:58:08,272 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:58:08,273 INFO L225 Difference]: With dead ends: 40 [2020-08-21 18:58:08,273 INFO L226 Difference]: Without dead ends: 28 [2020-08-21 18:58:08,274 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 18:58:08,274 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-21 18:58:08,278 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2020-08-21 18:58:08,279 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-21 18:58:08,280 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2020-08-21 18:58:08,280 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 24 [2020-08-21 18:58:08,280 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:58:08,280 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2020-08-21 18:58:08,280 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 18:58:08,281 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2020-08-21 18:58:08,281 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-21 18:58:08,282 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:58:08,282 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 18:58:08,282 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 18:58:08,282 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:58:08,283 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:58:08,283 INFO L82 PathProgramCache]: Analyzing trace with hash 1523652947, now seen corresponding path program 4 times [2020-08-21 18:58:08,283 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:58:08,283 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [262674577] [2020-08-21 18:58:08,283 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:58:08,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:58:08,379 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:58:08,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:58:08,383 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2020-08-21 18:58:08,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:58:08,389 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 18:58:08,390 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [262674577] [2020-08-21 18:58:08,390 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:58:08,390 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 18:58:08,391 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [729280172] [2020-08-21 18:58:08,391 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 18:58:08,391 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:58:08,392 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 18:58:08,392 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-08-21 18:58:08,392 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 8 states. [2020-08-21 18:58:08,456 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:58:08,456 INFO L93 Difference]: Finished difference Result 42 states and 44 transitions. [2020-08-21 18:58:08,457 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-21 18:58:08,457 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 26 [2020-08-21 18:58:08,457 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:58:08,458 INFO L225 Difference]: With dead ends: 42 [2020-08-21 18:58:08,458 INFO L226 Difference]: Without dead ends: 30 [2020-08-21 18:58:08,459 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 18:58:08,459 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-21 18:58:08,463 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2020-08-21 18:58:08,463 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-21 18:58:08,464 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 30 transitions. [2020-08-21 18:58:08,464 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 30 transitions. Word has length 26 [2020-08-21 18:58:08,465 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:58:08,465 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 30 transitions. [2020-08-21 18:58:08,465 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 18:58:08,465 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 30 transitions. [2020-08-21 18:58:08,466 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-21 18:58:08,466 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:58:08,466 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 18:58:08,466 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 18:58:08,467 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:58:08,467 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:58:08,467 INFO L82 PathProgramCache]: Analyzing trace with hash 1787714037, now seen corresponding path program 5 times [2020-08-21 18:58:08,467 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:58:08,468 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1435352026] [2020-08-21 18:58:08,468 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:58:08,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:58:08,553 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:58:08,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:58:08,557 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2020-08-21 18:58:08,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:58:08,562 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 18:58:08,562 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1435352026] [2020-08-21 18:58:08,563 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:58:08,563 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 18:58:08,563 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1792302071] [2020-08-21 18:58:08,564 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 18:58:08,564 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:58:08,564 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 18:58:08,564 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2020-08-21 18:58:08,565 INFO L87 Difference]: Start difference. First operand 29 states and 30 transitions. Second operand 9 states. [2020-08-21 18:58:08,641 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:58:08,641 INFO L93 Difference]: Finished difference Result 44 states and 46 transitions. [2020-08-21 18:58:08,641 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 18:58:08,641 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 28 [2020-08-21 18:58:08,642 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:58:08,642 INFO L225 Difference]: With dead ends: 44 [2020-08-21 18:58:08,642 INFO L226 Difference]: Without dead ends: 32 [2020-08-21 18:58:08,643 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 18:58:08,644 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-21 18:58:08,647 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2020-08-21 18:58:08,648 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-21 18:58:08,648 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 32 transitions. [2020-08-21 18:58:08,649 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 32 transitions. Word has length 28 [2020-08-21 18:58:08,649 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:58:08,649 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 32 transitions. [2020-08-21 18:58:08,649 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 18:58:08,649 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 32 transitions. [2020-08-21 18:58:08,650 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-21 18:58:08,650 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:58:08,650 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 18:58:08,651 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 18:58:08,651 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:58:08,651 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:58:08,651 INFO L82 PathProgramCache]: Analyzing trace with hash 2147351063, now seen corresponding path program 6 times [2020-08-21 18:58:08,652 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:58:08,652 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1460842751] [2020-08-21 18:58:08,652 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:58:08,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:58:08,737 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:58:08,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:58:08,740 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-08-21 18:58:08,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:58:08,745 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 18:58:08,745 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1460842751] [2020-08-21 18:58:08,745 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:58:08,746 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-21 18:58:08,746 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [669033054] [2020-08-21 18:58:08,746 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 18:58:08,747 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:58:08,747 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 18:58:08,747 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2020-08-21 18:58:08,747 INFO L87 Difference]: Start difference. First operand 31 states and 32 transitions. Second operand 10 states. [2020-08-21 18:58:08,807 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:58:08,807 INFO L93 Difference]: Finished difference Result 46 states and 48 transitions. [2020-08-21 18:58:08,807 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 18:58:08,808 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 30 [2020-08-21 18:58:08,808 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:58:08,808 INFO L225 Difference]: With dead ends: 46 [2020-08-21 18:58:08,809 INFO L226 Difference]: Without dead ends: 34 [2020-08-21 18:58:08,809 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 18:58:08,810 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-21 18:58:08,813 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2020-08-21 18:58:08,813 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-21 18:58:08,814 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2020-08-21 18:58:08,814 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 30 [2020-08-21 18:58:08,815 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:58:08,815 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2020-08-21 18:58:08,815 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 18:58:08,815 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2020-08-21 18:58:08,815 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-21 18:58:08,816 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:58:08,816 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 18:58:08,816 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-21 18:58:08,816 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:58:08,816 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:58:08,816 INFO L82 PathProgramCache]: Analyzing trace with hash -133817927, now seen corresponding path program 7 times [2020-08-21 18:58:08,817 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:58:08,817 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1600824727] [2020-08-21 18:58:08,817 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:58:08,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:58:08,914 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:58:08,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:58:08,918 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2020-08-21 18:58:08,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:58:08,924 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 18:58:08,924 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1600824727] [2020-08-21 18:58:08,925 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:58:08,925 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-21 18:58:08,925 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1761825581] [2020-08-21 18:58:08,926 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 18:58:08,926 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:58:08,926 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 18:58:08,926 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2020-08-21 18:58:08,927 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 11 states. [2020-08-21 18:58:09,019 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:58:09,020 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2020-08-21 18:58:09,021 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-21 18:58:09,021 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 32 [2020-08-21 18:58:09,021 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:58:09,022 INFO L225 Difference]: With dead ends: 48 [2020-08-21 18:58:09,022 INFO L226 Difference]: Without dead ends: 36 [2020-08-21 18:58:09,023 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 18:58:09,023 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-21 18:58:09,028 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2020-08-21 18:58:09,031 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-21 18:58:09,032 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 36 transitions. [2020-08-21 18:58:09,032 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 36 transitions. Word has length 32 [2020-08-21 18:58:09,032 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:58:09,032 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 36 transitions. [2020-08-21 18:58:09,033 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 18:58:09,033 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 36 transitions. [2020-08-21 18:58:09,034 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-21 18:58:09,034 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:58:09,034 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 18:58:09,034 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-21 18:58:09,035 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:58:09,035 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:58:09,035 INFO L82 PathProgramCache]: Analyzing trace with hash -1903896357, now seen corresponding path program 8 times [2020-08-21 18:58:09,035 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:58:09,036 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1707427826] [2020-08-21 18:58:09,036 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:58:09,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:58:09,156 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:58:09,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:58:09,160 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2020-08-21 18:58:09,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:58:09,165 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 18:58:09,165 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1707427826] [2020-08-21 18:58:09,166 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:58:09,166 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-21 18:58:09,166 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [793242599] [2020-08-21 18:58:09,166 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-21 18:58:09,167 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:58:09,167 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-21 18:58:09,167 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2020-08-21 18:58:09,167 INFO L87 Difference]: Start difference. First operand 35 states and 36 transitions. Second operand 12 states. [2020-08-21 18:58:09,243 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:58:09,243 INFO L93 Difference]: Finished difference Result 50 states and 52 transitions. [2020-08-21 18:58:09,243 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-21 18:58:09,244 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 34 [2020-08-21 18:58:09,244 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:58:09,245 INFO L225 Difference]: With dead ends: 50 [2020-08-21 18:58:09,245 INFO L226 Difference]: Without dead ends: 38 [2020-08-21 18:58:09,245 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 18:58:09,246 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-21 18:58:09,249 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2020-08-21 18:58:09,250 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-21 18:58:09,250 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 38 transitions. [2020-08-21 18:58:09,251 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 38 transitions. Word has length 34 [2020-08-21 18:58:09,251 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:58:09,251 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 38 transitions. [2020-08-21 18:58:09,251 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-21 18:58:09,251 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 38 transitions. [2020-08-21 18:58:09,252 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-21 18:58:09,252 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:58:09,252 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 18:58:09,252 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-21 18:58:09,253 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:58:09,253 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:58:09,253 INFO L82 PathProgramCache]: Analyzing trace with hash -2142218371, now seen corresponding path program 9 times [2020-08-21 18:58:09,253 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:58:09,254 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [419886354] [2020-08-21 18:58:09,254 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:58:09,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:58:09,394 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:58:09,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:58:09,398 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2020-08-21 18:58:09,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:58:09,406 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 18:58:09,406 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [419886354] [2020-08-21 18:58:09,406 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:58:09,406 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 18:58:09,407 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [24298438] [2020-08-21 18:58:09,408 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 18:58:09,409 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:58:09,409 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 18:58:09,409 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2020-08-21 18:58:09,409 INFO L87 Difference]: Start difference. First operand 37 states and 38 transitions. Second operand 13 states. [2020-08-21 18:58:09,496 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:58:09,496 INFO L93 Difference]: Finished difference Result 52 states and 54 transitions. [2020-08-21 18:58:09,497 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-21 18:58:09,497 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 36 [2020-08-21 18:58:09,497 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:58:09,498 INFO L225 Difference]: With dead ends: 52 [2020-08-21 18:58:09,498 INFO L226 Difference]: Without dead ends: 40 [2020-08-21 18:58:09,500 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2020-08-21 18:58:09,501 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-21 18:58:09,507 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2020-08-21 18:58:09,507 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-21 18:58:09,508 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2020-08-21 18:58:09,508 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 36 [2020-08-21 18:58:09,508 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:58:09,508 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2020-08-21 18:58:09,508 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 18:58:09,508 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2020-08-21 18:58:09,511 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-21 18:58:09,511 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:58:09,511 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 18:58:09,512 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-21 18:58:09,513 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:58:09,513 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:58:09,513 INFO L82 PathProgramCache]: Analyzing trace with hash 758560159, now seen corresponding path program 10 times [2020-08-21 18:58:09,513 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:58:09,514 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [21101212] [2020-08-21 18:58:09,514 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:58:09,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:58:09,677 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:58:09,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:58:09,682 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 31 [2020-08-21 18:58:09,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:58:09,690 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:58:09,691 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [21101212] [2020-08-21 18:58:09,691 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:58:09,691 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-21 18:58:09,692 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1725725001] [2020-08-21 18:58:09,692 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-21 18:58:09,692 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:58:09,693 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-21 18:58:09,693 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2020-08-21 18:58:09,693 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 14 states. [2020-08-21 18:58:09,790 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:58:09,790 INFO L93 Difference]: Finished difference Result 54 states and 56 transitions. [2020-08-21 18:58:09,792 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-21 18:58:09,792 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 38 [2020-08-21 18:58:09,793 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:58:09,793 INFO L225 Difference]: With dead ends: 54 [2020-08-21 18:58:09,793 INFO L226 Difference]: Without dead ends: 42 [2020-08-21 18:58:09,794 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2020-08-21 18:58:09,796 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-21 18:58:09,802 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2020-08-21 18:58:09,802 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-21 18:58:09,803 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 42 transitions. [2020-08-21 18:58:09,803 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 42 transitions. Word has length 38 [2020-08-21 18:58:09,803 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:58:09,803 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 42 transitions. [2020-08-21 18:58:09,803 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-21 18:58:09,804 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 42 transitions. [2020-08-21 18:58:09,804 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-21 18:58:09,804 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:58:09,807 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:58:09,808 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-21 18:58:09,808 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:58:09,808 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:58:09,808 INFO L82 PathProgramCache]: Analyzing trace with hash 972952385, now seen corresponding path program 11 times [2020-08-21 18:58:09,809 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:58:09,809 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [713902801] [2020-08-21 18:58:09,809 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:58:09,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:58:09,977 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:58:09,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:58:09,979 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 33 [2020-08-21 18:58:09,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:58:09,984 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:58:09,985 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [713902801] [2020-08-21 18:58:09,985 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:58:09,985 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-21 18:58:09,985 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1493093723] [2020-08-21 18:58:09,987 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-21 18:58:09,987 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:58:09,988 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-21 18:58:09,988 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2020-08-21 18:58:09,988 INFO L87 Difference]: Start difference. First operand 41 states and 42 transitions. Second operand 15 states. [2020-08-21 18:58:10,097 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:58:10,097 INFO L93 Difference]: Finished difference Result 56 states and 58 transitions. [2020-08-21 18:58:10,098 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-21 18:58:10,098 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 40 [2020-08-21 18:58:10,098 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:58:10,099 INFO L225 Difference]: With dead ends: 56 [2020-08-21 18:58:10,099 INFO L226 Difference]: Without dead ends: 44 [2020-08-21 18:58:10,099 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2020-08-21 18:58:10,101 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-21 18:58:10,109 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2020-08-21 18:58:10,109 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-21 18:58:10,110 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 44 transitions. [2020-08-21 18:58:10,110 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 44 transitions. Word has length 40 [2020-08-21 18:58:10,110 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:58:10,110 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 44 transitions. [2020-08-21 18:58:10,111 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-21 18:58:10,113 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 44 transitions. [2020-08-21 18:58:10,113 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-21 18:58:10,114 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:58:10,114 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:58:10,114 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-21 18:58:10,114 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:58:10,114 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:58:10,115 INFO L82 PathProgramCache]: Analyzing trace with hash 845451363, now seen corresponding path program 12 times [2020-08-21 18:58:10,115 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:58:10,115 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1814635122] [2020-08-21 18:58:10,115 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:58:10,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:58:10,299 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:58:10,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:58:10,302 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 35 [2020-08-21 18:58:10,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:58:10,307 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:58:10,307 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1814635122] [2020-08-21 18:58:10,308 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:58:10,309 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-21 18:58:10,309 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [138609845] [2020-08-21 18:58:10,310 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-21 18:58:10,310 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:58:10,311 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-21 18:58:10,312 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2020-08-21 18:58:10,312 INFO L87 Difference]: Start difference. First operand 43 states and 44 transitions. Second operand 16 states. [2020-08-21 18:58:10,395 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:58:10,396 INFO L93 Difference]: Finished difference Result 58 states and 60 transitions. [2020-08-21 18:58:10,396 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-21 18:58:10,396 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 42 [2020-08-21 18:58:10,396 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:58:10,397 INFO L225 Difference]: With dead ends: 58 [2020-08-21 18:58:10,397 INFO L226 Difference]: Without dead ends: 46 [2020-08-21 18:58:10,398 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2020-08-21 18:58:10,398 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-21 18:58:10,401 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2020-08-21 18:58:10,402 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-21 18:58:10,402 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 46 transitions. [2020-08-21 18:58:10,402 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 46 transitions. Word has length 42 [2020-08-21 18:58:10,403 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:58:10,403 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 46 transitions. [2020-08-21 18:58:10,403 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-21 18:58:10,403 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 46 transitions. [2020-08-21 18:58:10,404 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-21 18:58:10,404 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:58:10,404 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:58:10,404 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-21 18:58:10,404 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:58:10,405 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:58:10,405 INFO L82 PathProgramCache]: Analyzing trace with hash -1423946491, now seen corresponding path program 13 times [2020-08-21 18:58:10,405 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:58:10,405 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1164486366] [2020-08-21 18:58:10,405 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:58:10,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:58:10,583 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:58:10,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:58:10,586 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2020-08-21 18:58:10,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:58:10,591 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:58:10,591 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1164486366] [2020-08-21 18:58:10,592 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:58:10,592 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-21 18:58:10,592 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [441409324] [2020-08-21 18:58:10,592 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-21 18:58:10,593 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:58:10,593 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-21 18:58:10,593 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2020-08-21 18:58:10,593 INFO L87 Difference]: Start difference. First operand 45 states and 46 transitions. Second operand 17 states. [2020-08-21 18:58:10,711 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:58:10,712 INFO L93 Difference]: Finished difference Result 60 states and 62 transitions. [2020-08-21 18:58:10,712 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-21 18:58:10,712 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 44 [2020-08-21 18:58:10,713 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:58:10,713 INFO L225 Difference]: With dead ends: 60 [2020-08-21 18:58:10,713 INFO L226 Difference]: Without dead ends: 48 [2020-08-21 18:58:10,715 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2020-08-21 18:58:10,716 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-21 18:58:10,725 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 47. [2020-08-21 18:58:10,726 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-21 18:58:10,726 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 48 transitions. [2020-08-21 18:58:10,726 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 48 transitions. Word has length 44 [2020-08-21 18:58:10,727 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:58:10,727 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 48 transitions. [2020-08-21 18:58:10,727 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-21 18:58:10,727 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 48 transitions. [2020-08-21 18:58:10,728 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-21 18:58:10,728 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:58:10,728 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:58:10,728 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-21 18:58:10,728 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:58:10,728 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:58:10,729 INFO L82 PathProgramCache]: Analyzing trace with hash -471897817, now seen corresponding path program 14 times [2020-08-21 18:58:10,729 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:58:10,729 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [482587488] [2020-08-21 18:58:10,729 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:58:10,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:58:10,925 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:58:10,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:58:10,927 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 39 [2020-08-21 18:58:10,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:58:10,933 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:58:10,933 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [482587488] [2020-08-21 18:58:10,933 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:58:10,933 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-21 18:58:10,934 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [828072512] [2020-08-21 18:58:10,934 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-21 18:58:10,934 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:58:10,935 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-21 18:58:10,935 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2020-08-21 18:58:10,935 INFO L87 Difference]: Start difference. First operand 47 states and 48 transitions. Second operand 18 states. [2020-08-21 18:58:11,027 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:58:11,027 INFO L93 Difference]: Finished difference Result 62 states and 64 transitions. [2020-08-21 18:58:11,027 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-21 18:58:11,027 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 46 [2020-08-21 18:58:11,028 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:58:11,028 INFO L225 Difference]: With dead ends: 62 [2020-08-21 18:58:11,028 INFO L226 Difference]: Without dead ends: 50 [2020-08-21 18:58:11,029 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2020-08-21 18:58:11,029 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-08-21 18:58:11,032 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 49. [2020-08-21 18:58:11,033 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-21 18:58:11,033 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 50 transitions. [2020-08-21 18:58:11,033 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 50 transitions. Word has length 46 [2020-08-21 18:58:11,034 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:58:11,034 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 50 transitions. [2020-08-21 18:58:11,034 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-21 18:58:11,034 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 50 transitions. [2020-08-21 18:58:11,035 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-21 18:58:11,035 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:58:11,035 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:58:11,035 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-21 18:58:11,035 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:58:11,035 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:58:11,036 INFO L82 PathProgramCache]: Analyzing trace with hash -381156151, now seen corresponding path program 15 times [2020-08-21 18:58:11,036 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:58:11,036 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [499021830] [2020-08-21 18:58:11,036 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:58:11,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:58:11,242 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:58:11,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:58:11,245 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 41 [2020-08-21 18:58:11,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:58:11,251 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:58:11,251 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [499021830] [2020-08-21 18:58:11,251 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:58:11,252 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-21 18:58:11,252 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1183726680] [2020-08-21 18:58:11,252 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-21 18:58:11,252 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:58:11,253 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-21 18:58:11,253 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2020-08-21 18:58:11,253 INFO L87 Difference]: Start difference. First operand 49 states and 50 transitions. Second operand 19 states. [2020-08-21 18:58:11,341 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:58:11,341 INFO L93 Difference]: Finished difference Result 64 states and 66 transitions. [2020-08-21 18:58:11,341 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-21 18:58:11,341 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 48 [2020-08-21 18:58:11,342 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:58:11,342 INFO L225 Difference]: With dead ends: 64 [2020-08-21 18:58:11,342 INFO L226 Difference]: Without dead ends: 52 [2020-08-21 18:58:11,343 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2020-08-21 18:58:11,344 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-21 18:58:11,347 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2020-08-21 18:58:11,347 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-21 18:58:11,347 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 52 transitions. [2020-08-21 18:58:11,348 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 52 transitions. Word has length 48 [2020-08-21 18:58:11,348 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:58:11,348 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 52 transitions. [2020-08-21 18:58:11,348 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-21 18:58:11,348 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 52 transitions. [2020-08-21 18:58:11,349 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-21 18:58:11,349 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:58:11,349 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:58:11,349 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-21 18:58:11,349 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:58:11,350 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:58:11,350 INFO L82 PathProgramCache]: Analyzing trace with hash 922238955, now seen corresponding path program 16 times [2020-08-21 18:58:11,350 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:58:11,350 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [29287609] [2020-08-21 18:58:11,350 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:58:11,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:58:11,588 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:58:11,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:58:11,591 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 43 [2020-08-21 18:58:11,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:58:11,598 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:58:11,598 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [29287609] [2020-08-21 18:58:11,598 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:58:11,599 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-21 18:58:11,599 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1233407649] [2020-08-21 18:58:11,599 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-21 18:58:11,600 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:58:11,600 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-21 18:58:11,600 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2020-08-21 18:58:11,601 INFO L87 Difference]: Start difference. First operand 51 states and 52 transitions. Second operand 20 states. [2020-08-21 18:58:11,725 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:58:11,726 INFO L93 Difference]: Finished difference Result 66 states and 68 transitions. [2020-08-21 18:58:11,726 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-21 18:58:11,726 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 50 [2020-08-21 18:58:11,727 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:58:11,727 INFO L225 Difference]: With dead ends: 66 [2020-08-21 18:58:11,728 INFO L226 Difference]: Without dead ends: 54 [2020-08-21 18:58:11,729 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2020-08-21 18:58:11,729 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-21 18:58:11,732 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2020-08-21 18:58:11,733 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-21 18:58:11,733 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 54 transitions. [2020-08-21 18:58:11,733 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 54 transitions. Word has length 50 [2020-08-21 18:58:11,734 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:58:11,734 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 54 transitions. [2020-08-21 18:58:11,734 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-21 18:58:11,734 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 54 transitions. [2020-08-21 18:58:11,735 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-21 18:58:11,735 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:58:11,735 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:58:11,735 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-21 18:58:11,735 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:58:11,736 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:58:11,736 INFO L82 PathProgramCache]: Analyzing trace with hash -645514611, now seen corresponding path program 17 times [2020-08-21 18:58:11,736 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:58:11,737 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1360511305] [2020-08-21 18:58:11,737 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:58:11,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:58:12,000 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:58:12,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:58:12,003 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 45 [2020-08-21 18:58:12,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:58:12,009 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:58:12,009 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1360511305] [2020-08-21 18:58:12,009 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:58:12,010 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-21 18:58:12,010 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1780985501] [2020-08-21 18:58:12,010 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-21 18:58:12,011 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:58:12,011 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-21 18:58:12,011 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2020-08-21 18:58:12,012 INFO L87 Difference]: Start difference. First operand 53 states and 54 transitions. Second operand 21 states. [2020-08-21 18:58:12,151 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:58:12,151 INFO L93 Difference]: Finished difference Result 68 states and 70 transitions. [2020-08-21 18:58:12,151 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-21 18:58:12,152 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 52 [2020-08-21 18:58:12,152 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:58:12,153 INFO L225 Difference]: With dead ends: 68 [2020-08-21 18:58:12,153 INFO L226 Difference]: Without dead ends: 56 [2020-08-21 18:58:12,153 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2020-08-21 18:58:12,154 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-08-21 18:58:12,157 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2020-08-21 18:58:12,157 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-21 18:58:12,158 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 56 transitions. [2020-08-21 18:58:12,158 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 56 transitions. Word has length 52 [2020-08-21 18:58:12,158 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:58:12,158 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 56 transitions. [2020-08-21 18:58:12,158 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-21 18:58:12,159 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 56 transitions. [2020-08-21 18:58:12,159 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-21 18:58:12,159 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:58:12,159 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:58:12,160 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-21 18:58:12,160 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:58:12,160 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:58:12,160 INFO L82 PathProgramCache]: Analyzing trace with hash 276829359, now seen corresponding path program 18 times [2020-08-21 18:58:12,161 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:58:12,161 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [911297853] [2020-08-21 18:58:12,161 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:58:12,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:58:12,407 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:58:12,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:58:12,410 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 47 [2020-08-21 18:58:12,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:58:12,416 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:58:12,416 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [911297853] [2020-08-21 18:58:12,416 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:58:12,416 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-21 18:58:12,416 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1887040266] [2020-08-21 18:58:12,417 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-21 18:58:12,417 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:58:12,417 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-21 18:58:12,418 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2020-08-21 18:58:12,418 INFO L87 Difference]: Start difference. First operand 55 states and 56 transitions. Second operand 22 states. [2020-08-21 18:58:12,505 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:58:12,505 INFO L93 Difference]: Finished difference Result 70 states and 72 transitions. [2020-08-21 18:58:12,505 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-21 18:58:12,505 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 54 [2020-08-21 18:58:12,506 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:58:12,506 INFO L225 Difference]: With dead ends: 70 [2020-08-21 18:58:12,506 INFO L226 Difference]: Without dead ends: 58 [2020-08-21 18:58:12,507 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2020-08-21 18:58:12,507 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-21 18:58:12,510 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2020-08-21 18:58:12,510 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-21 18:58:12,510 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 58 transitions. [2020-08-21 18:58:12,511 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 58 transitions. Word has length 54 [2020-08-21 18:58:12,511 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:58:12,511 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 58 transitions. [2020-08-21 18:58:12,511 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-21 18:58:12,511 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 58 transitions. [2020-08-21 18:58:12,512 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-21 18:58:12,512 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:58:12,512 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:58:12,512 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-21 18:58:12,512 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:58:12,512 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:58:12,513 INFO L82 PathProgramCache]: Analyzing trace with hash 1886121553, now seen corresponding path program 19 times [2020-08-21 18:58:12,513 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:58:12,513 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [639121394] [2020-08-21 18:58:12,513 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:58:12,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:58:12,813 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:58:12,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:58:12,818 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 49 [2020-08-21 18:58:12,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:58:12,826 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:58:12,827 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [639121394] [2020-08-21 18:58:12,827 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:58:12,827 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-21 18:58:12,827 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1374520092] [2020-08-21 18:58:12,828 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-21 18:58:12,828 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:58:12,828 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-21 18:58:12,829 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2020-08-21 18:58:12,829 INFO L87 Difference]: Start difference. First operand 57 states and 58 transitions. Second operand 23 states. [2020-08-21 18:58:12,985 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:58:12,985 INFO L93 Difference]: Finished difference Result 71 states and 73 transitions. [2020-08-21 18:58:12,985 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-21 18:58:12,986 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 56 [2020-08-21 18:58:12,986 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:58:12,986 INFO L225 Difference]: With dead ends: 71 [2020-08-21 18:58:12,986 INFO L226 Difference]: Without dead ends: 59 [2020-08-21 18:58:12,987 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2020-08-21 18:58:12,988 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-08-21 18:58:12,990 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2020-08-21 18:58:12,991 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-08-21 18:58:12,991 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 60 transitions. [2020-08-21 18:58:12,991 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 60 transitions. Word has length 56 [2020-08-21 18:58:12,991 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:58:12,992 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 60 transitions. [2020-08-21 18:58:12,992 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-21 18:58:12,992 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 60 transitions. [2020-08-21 18:58:12,992 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-08-21 18:58:12,992 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:58:12,992 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:58:12,993 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-21 18:58:12,993 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:58:12,993 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:58:12,993 INFO L82 PathProgramCache]: Analyzing trace with hash -2067273869, now seen corresponding path program 20 times [2020-08-21 18:58:12,994 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:58:12,994 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2124289892] [2020-08-21 18:58:12,994 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:58:13,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-21 18:58:13,098 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-08-21 18:58:13,098 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-21 18:58:13,103 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-21 18:58:13,138 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.08 06:58:13 BoogieIcfgContainer [2020-08-21 18:58:13,138 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-21 18:58:13,147 INFO L168 Benchmark]: Toolchain (without parser) took 6868.93 ms. Allocated memory was 138.9 MB in the beginning and 311.4 MB in the end (delta: 172.5 MB). Free memory was 101.7 MB in the beginning and 211.8 MB in the end (delta: -110.2 MB). Peak memory consumption was 62.3 MB. Max. memory is 7.1 GB. [2020-08-21 18:58:13,151 INFO L168 Benchmark]: CDTParser took 0.27 ms. Allocated memory is still 138.9 MB. Free memory was 120.4 MB in the beginning and 120.2 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-08-21 18:58:13,154 INFO L168 Benchmark]: CACSL2BoogieTranslator took 356.57 ms. Allocated memory was 138.9 MB in the beginning and 201.9 MB in the end (delta: 62.9 MB). Free memory was 101.5 MB in the beginning and 180.7 MB in the end (delta: -79.2 MB). Peak memory consumption was 22.3 MB. Max. memory is 7.1 GB. [2020-08-21 18:58:13,154 INFO L168 Benchmark]: Boogie Preprocessor took 40.40 ms. Allocated memory is still 201.9 MB. Free memory was 180.7 MB in the beginning and 178.7 MB in the end (delta: 2.0 MB). Peak memory consumption was 2.0 MB. Max. memory is 7.1 GB. [2020-08-21 18:58:13,154 INFO L168 Benchmark]: RCFGBuilder took 356.81 ms. Allocated memory is still 201.9 MB. Free memory was 178.7 MB in the beginning and 162.9 MB in the end (delta: 15.8 MB). Peak memory consumption was 15.8 MB. Max. memory is 7.1 GB. [2020-08-21 18:58:13,155 INFO L168 Benchmark]: TraceAbstraction took 6106.73 ms. Allocated memory was 201.9 MB in the beginning and 311.4 MB in the end (delta: 109.6 MB). Free memory was 162.2 MB in the beginning and 211.8 MB in the end (delta: -49.6 MB). Peak memory consumption was 60.0 MB. Max. memory is 7.1 GB. [2020-08-21 18:58:13,159 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.27 ms. Allocated memory is still 138.9 MB. Free memory was 120.4 MB in the beginning and 120.2 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 356.57 ms. Allocated memory was 138.9 MB in the beginning and 201.9 MB in the end (delta: 62.9 MB). Free memory was 101.5 MB in the beginning and 180.7 MB in the end (delta: -79.2 MB). Peak memory consumption was 22.3 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 40.40 ms. Allocated memory is still 201.9 MB. Free memory was 180.7 MB in the beginning and 178.7 MB in the end (delta: 2.0 MB). Peak memory consumption was 2.0 MB. Max. memory is 7.1 GB. * RCFGBuilder took 356.81 ms. Allocated memory is still 201.9 MB. Free memory was 178.7 MB in the beginning and 162.9 MB in the end (delta: 15.8 MB). Peak memory consumption was 15.8 MB. Max. memory is 7.1 GB. * TraceAbstraction took 6106.73 ms. Allocated memory was 201.9 MB in the beginning and 311.4 MB in the end (delta: 109.6 MB). Free memory was 162.2 MB in the beginning and 211.8 MB in the end (delta: -49.6 MB). Peak memory consumption was 60.0 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 37]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L15] struct dummy ad1[20], *ad2; [L16] int i, j, *pa; [L17] j=0 [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND FALSE !(j<20) [L21] i = __VERIFIER_nondet_int() [L22] COND TRUE i >= 0 && i < 10 [L23] ad2 = ad1 [L24] ad1[i].a = i [L25] pa = &ad1[i].a [L26] EXPR ad2[i].a [L26] i = ad2[i].a + 10 [L27] EXPR \read(*pa) [L27] COND FALSE !(i < *pa) [L30] CALL, EXPR check(ad1, i) [L10] EXPR ad1[b].a [L10] return ad1[b].a == b; [L30] RET, EXPR check(ad1, i) [L30] COND TRUE !check(ad1, i) [L37] __VERIFIER_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 25 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 6.0s, OverallIterations: 22, TraceHistogramMax: 20, AutomataDifference: 2.0s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 365 SDtfs, 252 SDslu, 1934 SDs, 0 SdLazy, 1339 SolverSat, 72 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.3s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 336 GetRequests, 105 SyntacticMatches, 0 SemanticMatches, 231 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 190 ImplicationChecksByTransitivity, 2.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=59occurred in iteration=21, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 21 MinimizatonAttempts, 19 StatesRemovedByMinimization, 19 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.4s SatisfiabilityAnalysisTime, 2.9s InterpolantComputationTime, 815 NumberOfCodeBlocks, 815 NumberOfCodeBlocksAsserted, 22 NumberOfCheckSat, 736 ConstructedInterpolants, 0 QuantifiedInterpolants, 69580 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 21 InterpolantComputations, 2 PerfectInterpolantSequences, 0/2470 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...