/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=1000 --traceabstraction.additional.smt.options interpolation-heuristic=SMALLEST --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 16:33:08,831 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 16:33:08,834 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 16:33:08,878 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 16:33:08,879 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 16:33:08,882 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 16:33:08,883 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 16:33:08,893 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 16:33:08,895 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 16:33:08,896 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 16:33:08,899 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 16:33:08,900 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 16:33:08,900 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 16:33:08,901 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 16:33:08,905 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 16:33:08,906 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 16:33:08,907 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 16:33:08,909 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 16:33:08,911 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 16:33:08,912 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 16:33:08,914 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 16:33:08,915 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 16:33:08,916 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 16:33:08,916 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 16:33:08,919 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-21 16:33:08,919 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-21 16:33:08,919 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-21 16:33:08,920 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-21 16:33:08,920 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-21 16:33:08,921 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... 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[2020-08-21 16:33:08,926 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 16:33:08,927 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 16:33:08,928 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 16:33:08,928 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 16:33:08,952 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 16:33:08,952 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 16:33:08,953 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 16:33:08,953 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 16:33:08,953 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 16:33:08,954 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 16:33:08,954 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 16:33:08,954 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 16:33:08,954 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 16:33:08,955 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 16:33:08,955 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 16:33:08,955 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 16:33:08,955 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 16:33:08,955 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 16:33:08,955 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 16:33:08,956 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 16:33:08,956 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 16:33:08,956 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 16:33:08,956 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 16:33:08,957 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 16:33:08,957 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 16:33:08,957 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 16:33:08,957 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 16:33:08,957 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 16:33:08,958 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 16:33:08,958 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 16:33:08,958 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 16:33:08,958 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 16:33:08,958 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 16:33:08,958 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=1000;interpolation-heuristic=SMALLEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=1000;interpolation-heuristic=SMALLEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=1000;interpolation-heuristic=SMALLEST;log-additional-information=true; [2020-08-21 16:33:09,245 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 16:33:09,261 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 16:33:09,265 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 16:33:09,267 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 16:33:09,267 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 16:33:09,268 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-regression/test24-2.c [2020-08-21 16:33:09,335 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/f46ce1a82/530c62f9ca6344f695dede4f458e5c37/FLAG428812059 [2020-08-21 16:33:09,747 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 16:33:09,748 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/ldv-regression/test24-2.c [2020-08-21 16:33:09,756 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/f46ce1a82/530c62f9ca6344f695dede4f458e5c37/FLAG428812059 [2020-08-21 16:33:10,105 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/f46ce1a82/530c62f9ca6344f695dede4f458e5c37 [2020-08-21 16:33:10,114 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 16:33:10,116 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 16:33:10,117 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 16:33:10,117 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 16:33:10,121 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 16:33:10,122 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 04:33:10" (1/1) ... [2020-08-21 16:33:10,126 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3fad632e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 04:33:10, skipping insertion in model container [2020-08-21 16:33:10,126 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 04:33:10" (1/1) ... [2020-08-21 16:33:10,135 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 16:33:10,157 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 16:33:10,378 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 16:33:10,386 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 16:33:10,403 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 16:33:10,496 INFO L208 MainTranslator]: Completed translation [2020-08-21 16:33:10,497 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 04:33:10 WrapperNode [2020-08-21 16:33:10,497 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 16:33:10,498 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 16:33:10,498 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 16:33:10,498 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 16:33:10,514 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 04:33:10" (1/1) ... [2020-08-21 16:33:10,514 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 04:33:10" (1/1) ... [2020-08-21 16:33:10,526 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 04:33:10" (1/1) ... [2020-08-21 16:33:10,526 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 04:33:10" (1/1) ... [2020-08-21 16:33:10,534 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 04:33:10" (1/1) ... [2020-08-21 16:33:10,539 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 04:33:10" (1/1) ... [2020-08-21 16:33:10,541 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 04:33:10" (1/1) ... [2020-08-21 16:33:10,543 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 16:33:10,544 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 16:33:10,544 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 16:33:10,544 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 16:33:10,545 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 04:33:10" (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 16:33:10,607 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 16:33:10,607 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 16:33:10,607 INFO L138 BoogieDeclarations]: Found implementation of procedure check [2020-08-21 16:33:10,608 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 16:33:10,608 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 16:33:10,608 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-21 16:33:10,609 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-08-21 16:33:10,609 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-21 16:33:10,609 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 16:33:10,610 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-21 16:33:10,610 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-21 16:33:10,610 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-21 16:33:10,610 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 16:33:10,610 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 16:33:11,034 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 16:33:11,034 INFO L295 CfgBuilder]: Removed 2 assume(true) statements. [2020-08-21 16:33:11,038 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 04:33:11 BoogieIcfgContainer [2020-08-21 16:33:11,038 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 16:33:11,040 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 16:33:11,040 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 16:33:11,043 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 16:33:11,043 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 04:33:10" (1/3) ... [2020-08-21 16:33:11,044 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7e11d536 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 04:33:11, skipping insertion in model container [2020-08-21 16:33:11,044 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 04:33:10" (2/3) ... [2020-08-21 16:33:11,045 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7e11d536 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 04:33:11, skipping insertion in model container [2020-08-21 16:33:11,045 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 04:33:11" (3/3) ... [2020-08-21 16:33:11,047 INFO L109 eAbstractionObserver]: Analyzing ICFG test24-2.c [2020-08-21 16:33:11,058 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 16:33:11,066 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 16:33:11,081 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 16:33:11,106 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 16:33:11,106 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 16:33:11,106 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 16:33:11,106 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 16:33:11,106 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 16:33:11,107 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 16:33:11,107 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 16:33:11,107 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 16:33:11,125 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states. [2020-08-21 16:33:11,131 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-21 16:33:11,131 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:33:11,132 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 16:33:11,133 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:33:11,138 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:33:11,138 INFO L82 PathProgramCache]: Analyzing trace with hash 855240046, now seen corresponding path program 1 times [2020-08-21 16:33:11,145 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:33:11,145 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [538846045] [2020-08-21 16:33:11,146 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:33:11,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:11,321 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:33:11,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:11,331 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-21 16:33:11,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:11,347 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 16:33:11,348 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [538846045] [2020-08-21 16:33:11,350 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 16:33:11,351 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-21 16:33:11,352 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [950498312] [2020-08-21 16:33:11,356 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-21 16:33:11,357 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:33:11,371 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-21 16:33:11,373 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 16:33:11,375 INFO L87 Difference]: Start difference. First operand 25 states. Second operand 3 states. [2020-08-21 16:33:11,465 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:33:11,465 INFO L93 Difference]: Finished difference Result 42 states and 50 transitions. [2020-08-21 16:33:11,466 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 16:33:11,467 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2020-08-21 16:33:11,468 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:33:11,478 INFO L225 Difference]: With dead ends: 42 [2020-08-21 16:33:11,478 INFO L226 Difference]: Without dead ends: 20 [2020-08-21 16:33:11,482 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 16:33:11,499 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-21 16:33:11,513 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-21 16:33:11,514 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-21 16:33:11,515 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2020-08-21 16:33:11,516 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 17 [2020-08-21 16:33:11,517 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:33:11,517 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2020-08-21 16:33:11,517 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-21 16:33:11,517 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2020-08-21 16:33:11,518 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-21 16:33:11,518 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:33:11,519 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 16:33:11,519 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 16:33:11,519 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:33:11,520 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:33:11,520 INFO L82 PathProgramCache]: Analyzing trace with hash -1631497781, now seen corresponding path program 1 times [2020-08-21 16:33:11,520 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:33:11,521 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2076908598] [2020-08-21 16:33:11,521 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:33:11,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:11,593 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:33:11,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:11,601 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-08-21 16:33:11,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:11,612 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 16:33:11,613 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2076908598] [2020-08-21 16:33:11,613 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 16:33:11,613 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-21 16:33:11,614 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1510935579] [2020-08-21 16:33:11,615 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 16:33:11,616 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:33:11,616 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 16:33:11,616 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 16:33:11,617 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand 4 states. [2020-08-21 16:33:11,682 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:33:11,682 INFO L93 Difference]: Finished difference Result 34 states and 36 transitions. [2020-08-21 16:33:11,683 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-21 16:33:11,683 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 18 [2020-08-21 16:33:11,684 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:33:11,684 INFO L225 Difference]: With dead ends: 34 [2020-08-21 16:33:11,685 INFO L226 Difference]: Without dead ends: 22 [2020-08-21 16:33:11,686 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 16:33:11,687 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-21 16:33:11,692 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2020-08-21 16:33:11,692 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-21 16:33:11,693 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2020-08-21 16:33:11,694 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 18 [2020-08-21 16:33:11,694 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:33:11,694 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2020-08-21 16:33:11,695 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 16:33:11,695 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2020-08-21 16:33:11,696 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-21 16:33:11,696 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:33:11,696 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 16:33:11,696 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 16:33:11,697 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:33:11,697 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:33:11,697 INFO L82 PathProgramCache]: Analyzing trace with hash 1934775405, now seen corresponding path program 1 times [2020-08-21 16:33:11,698 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:33:11,698 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1982120221] [2020-08-21 16:33:11,698 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:33:11,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:11,773 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:33:11,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:11,779 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2020-08-21 16:33:11,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:11,788 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 16:33:11,788 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1982120221] [2020-08-21 16:33:11,789 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:33:11,789 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-21 16:33:11,789 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1663236961] [2020-08-21 16:33:11,790 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 16:33:11,790 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:33:11,790 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 16:33:11,791 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-21 16:33:11,791 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 5 states. [2020-08-21 16:33:11,851 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:33:11,852 INFO L93 Difference]: Finished difference Result 36 states and 38 transitions. [2020-08-21 16:33:11,852 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 16:33:11,852 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 20 [2020-08-21 16:33:11,853 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:33:11,853 INFO L225 Difference]: With dead ends: 36 [2020-08-21 16:33:11,854 INFO L226 Difference]: Without dead ends: 24 [2020-08-21 16:33:11,854 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 16:33:11,855 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-21 16:33:11,859 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2020-08-21 16:33:11,860 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-21 16:33:11,861 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2020-08-21 16:33:11,861 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 20 [2020-08-21 16:33:11,861 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:33:11,861 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2020-08-21 16:33:11,861 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 16:33:11,862 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2020-08-21 16:33:11,862 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-21 16:33:11,862 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:33:11,863 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 16:33:11,863 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 16:33:11,863 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:33:11,864 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:33:11,864 INFO L82 PathProgramCache]: Analyzing trace with hash 1739404943, now seen corresponding path program 2 times [2020-08-21 16:33:11,864 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:33:11,864 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2020497199] [2020-08-21 16:33:11,865 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:33:11,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:11,996 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:33:11,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:12,011 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2020-08-21 16:33:12,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:12,026 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 16:33:12,027 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2020497199] [2020-08-21 16:33:12,027 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:33:12,027 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-21 16:33:12,028 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1376822667] [2020-08-21 16:33:12,029 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 16:33:12,029 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:33:12,029 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 16:33:12,030 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-21 16:33:12,030 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand 6 states. [2020-08-21 16:33:12,103 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:33:12,103 INFO L93 Difference]: Finished difference Result 38 states and 40 transitions. [2020-08-21 16:33:12,103 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 16:33:12,104 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 22 [2020-08-21 16:33:12,104 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:33:12,105 INFO L225 Difference]: With dead ends: 38 [2020-08-21 16:33:12,105 INFO L226 Difference]: Without dead ends: 26 [2020-08-21 16:33:12,106 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 16:33:12,107 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-21 16:33:12,111 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2020-08-21 16:33:12,112 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-21 16:33:12,113 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 26 transitions. [2020-08-21 16:33:12,113 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 26 transitions. Word has length 22 [2020-08-21 16:33:12,114 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:33:12,114 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 26 transitions. [2020-08-21 16:33:12,114 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 16:33:12,115 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 26 transitions. [2020-08-21 16:33:12,115 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-21 16:33:12,116 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:33:12,116 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 16:33:12,116 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 16:33:12,117 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:33:12,117 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:33:12,117 INFO L82 PathProgramCache]: Analyzing trace with hash -1328015311, now seen corresponding path program 3 times [2020-08-21 16:33:12,118 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:33:12,118 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [667011612] [2020-08-21 16:33:12,118 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:33:12,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:12,249 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:33:12,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:12,255 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2020-08-21 16:33:12,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:12,272 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 16:33:12,273 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [667011612] [2020-08-21 16:33:12,274 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:33:12,274 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 16:33:12,274 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1832228121] [2020-08-21 16:33:12,275 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 16:33:12,275 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:33:12,275 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 16:33:12,277 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-08-21 16:33:12,277 INFO L87 Difference]: Start difference. First operand 25 states and 26 transitions. Second operand 7 states. [2020-08-21 16:33:12,358 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:33:12,359 INFO L93 Difference]: Finished difference Result 40 states and 42 transitions. [2020-08-21 16:33:12,360 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 16:33:12,360 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 24 [2020-08-21 16:33:12,361 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:33:12,361 INFO L225 Difference]: With dead ends: 40 [2020-08-21 16:33:12,361 INFO L226 Difference]: Without dead ends: 28 [2020-08-21 16:33:12,363 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 16:33:12,363 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-21 16:33:12,370 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2020-08-21 16:33:12,372 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-21 16:33:12,374 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2020-08-21 16:33:12,375 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 24 [2020-08-21 16:33:12,375 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:33:12,375 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2020-08-21 16:33:12,375 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 16:33:12,377 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2020-08-21 16:33:12,378 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-21 16:33:12,379 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:33:12,379 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 16:33:12,379 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 16:33:12,379 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:33:12,380 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:33:12,380 INFO L82 PathProgramCache]: Analyzing trace with hash 1523652947, now seen corresponding path program 4 times [2020-08-21 16:33:12,380 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:33:12,380 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [727473571] [2020-08-21 16:33:12,381 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:33:12,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:12,514 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:33:12,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:12,519 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2020-08-21 16:33:12,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:12,525 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 16:33:12,526 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [727473571] [2020-08-21 16:33:12,526 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:33:12,526 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 16:33:12,527 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [601505502] [2020-08-21 16:33:12,527 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 16:33:12,527 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:33:12,528 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 16:33:12,528 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-08-21 16:33:12,528 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 8 states. [2020-08-21 16:33:12,587 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:33:12,588 INFO L93 Difference]: Finished difference Result 42 states and 44 transitions. [2020-08-21 16:33:12,588 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-21 16:33:12,588 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 26 [2020-08-21 16:33:12,589 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:33:12,589 INFO L225 Difference]: With dead ends: 42 [2020-08-21 16:33:12,589 INFO L226 Difference]: Without dead ends: 30 [2020-08-21 16:33:12,590 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 16:33:12,591 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-21 16:33:12,595 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2020-08-21 16:33:12,595 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-21 16:33:12,596 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 30 transitions. [2020-08-21 16:33:12,596 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 30 transitions. Word has length 26 [2020-08-21 16:33:12,596 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:33:12,596 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 30 transitions. [2020-08-21 16:33:12,597 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 16:33:12,597 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 30 transitions. [2020-08-21 16:33:12,597 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-21 16:33:12,598 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:33:12,598 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 16:33:12,598 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 16:33:12,598 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:33:12,599 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:33:12,599 INFO L82 PathProgramCache]: Analyzing trace with hash 1787714037, now seen corresponding path program 5 times [2020-08-21 16:33:12,599 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:33:12,599 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2116352952] [2020-08-21 16:33:12,600 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:33:12,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:12,684 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:33:12,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:12,688 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2020-08-21 16:33:12,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:12,693 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 16:33:12,694 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2116352952] [2020-08-21 16:33:12,694 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:33:12,694 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 16:33:12,695 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [421115854] [2020-08-21 16:33:12,695 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 16:33:12,695 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:33:12,696 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 16:33:12,696 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2020-08-21 16:33:12,696 INFO L87 Difference]: Start difference. First operand 29 states and 30 transitions. Second operand 9 states. [2020-08-21 16:33:12,778 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:33:12,778 INFO L93 Difference]: Finished difference Result 44 states and 46 transitions. [2020-08-21 16:33:12,779 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 16:33:12,779 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 28 [2020-08-21 16:33:12,779 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:33:12,780 INFO L225 Difference]: With dead ends: 44 [2020-08-21 16:33:12,780 INFO L226 Difference]: Without dead ends: 32 [2020-08-21 16:33:12,781 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 16:33:12,781 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-21 16:33:12,785 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2020-08-21 16:33:12,786 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-21 16:33:12,786 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 32 transitions. [2020-08-21 16:33:12,787 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 32 transitions. Word has length 28 [2020-08-21 16:33:12,787 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:33:12,788 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 32 transitions. [2020-08-21 16:33:12,788 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 16:33:12,788 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 32 transitions. [2020-08-21 16:33:12,788 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-21 16:33:12,789 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:33:12,789 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 16:33:12,789 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 16:33:12,789 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:33:12,790 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:33:12,790 INFO L82 PathProgramCache]: Analyzing trace with hash 2147351063, now seen corresponding path program 6 times [2020-08-21 16:33:12,790 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:33:12,790 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2057136610] [2020-08-21 16:33:12,791 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:33:12,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:12,899 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:33:12,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:12,902 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-08-21 16:33:12,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:12,907 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 16:33:12,907 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2057136610] [2020-08-21 16:33:12,908 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:33:12,908 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-21 16:33:12,908 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1299940881] [2020-08-21 16:33:12,909 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 16:33:12,909 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:33:12,909 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 16:33:12,909 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2020-08-21 16:33:12,910 INFO L87 Difference]: Start difference. First operand 31 states and 32 transitions. Second operand 10 states. [2020-08-21 16:33:12,980 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:33:12,981 INFO L93 Difference]: Finished difference Result 46 states and 48 transitions. [2020-08-21 16:33:12,981 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 16:33:12,981 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 30 [2020-08-21 16:33:12,982 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:33:12,982 INFO L225 Difference]: With dead ends: 46 [2020-08-21 16:33:12,982 INFO L226 Difference]: Without dead ends: 34 [2020-08-21 16:33:12,983 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 16:33:12,983 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-21 16:33:12,991 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2020-08-21 16:33:12,991 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-21 16:33:12,994 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2020-08-21 16:33:12,994 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 30 [2020-08-21 16:33:12,994 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:33:12,994 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2020-08-21 16:33:12,995 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 16:33:12,995 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2020-08-21 16:33:12,995 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-21 16:33:12,995 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:33:12,996 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 16:33:12,996 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-21 16:33:12,996 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:33:12,996 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:33:12,997 INFO L82 PathProgramCache]: Analyzing trace with hash -133817927, now seen corresponding path program 7 times [2020-08-21 16:33:12,997 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:33:12,997 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [579769125] [2020-08-21 16:33:12,997 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:33:13,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:13,096 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:33:13,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:13,100 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2020-08-21 16:33:13,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:13,105 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 16:33:13,106 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [579769125] [2020-08-21 16:33:13,106 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:33:13,106 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-21 16:33:13,107 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1800227785] [2020-08-21 16:33:13,107 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 16:33:13,107 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:33:13,108 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 16:33:13,108 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2020-08-21 16:33:13,109 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 11 states. [2020-08-21 16:33:13,192 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:33:13,192 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2020-08-21 16:33:13,192 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-21 16:33:13,193 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 32 [2020-08-21 16:33:13,193 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:33:13,193 INFO L225 Difference]: With dead ends: 48 [2020-08-21 16:33:13,194 INFO L226 Difference]: Without dead ends: 36 [2020-08-21 16:33:13,194 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 16:33:13,195 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-21 16:33:13,198 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2020-08-21 16:33:13,199 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-21 16:33:13,199 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 36 transitions. [2020-08-21 16:33:13,200 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 36 transitions. Word has length 32 [2020-08-21 16:33:13,200 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:33:13,200 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 36 transitions. [2020-08-21 16:33:13,200 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 16:33:13,200 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 36 transitions. [2020-08-21 16:33:13,201 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-21 16:33:13,201 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:33:13,201 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 16:33:13,202 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-21 16:33:13,202 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:33:13,202 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:33:13,202 INFO L82 PathProgramCache]: Analyzing trace with hash -1903896357, now seen corresponding path program 8 times [2020-08-21 16:33:13,203 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:33:13,203 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2060797420] [2020-08-21 16:33:13,203 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:33:13,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:13,315 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:33:13,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:13,318 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2020-08-21 16:33:13,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:13,323 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 16:33:13,323 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2060797420] [2020-08-21 16:33:13,323 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:33:13,324 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-21 16:33:13,324 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1311385457] [2020-08-21 16:33:13,324 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-21 16:33:13,324 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:33:13,325 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-21 16:33:13,325 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2020-08-21 16:33:13,325 INFO L87 Difference]: Start difference. First operand 35 states and 36 transitions. Second operand 12 states. [2020-08-21 16:33:13,391 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:33:13,392 INFO L93 Difference]: Finished difference Result 50 states and 52 transitions. [2020-08-21 16:33:13,392 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-21 16:33:13,392 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 34 [2020-08-21 16:33:13,393 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:33:13,393 INFO L225 Difference]: With dead ends: 50 [2020-08-21 16:33:13,393 INFO L226 Difference]: Without dead ends: 38 [2020-08-21 16:33:13,394 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 16:33:13,394 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-21 16:33:13,398 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2020-08-21 16:33:13,398 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-21 16:33:13,399 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 38 transitions. [2020-08-21 16:33:13,399 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 38 transitions. Word has length 34 [2020-08-21 16:33:13,399 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:33:13,399 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 38 transitions. [2020-08-21 16:33:13,399 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-21 16:33:13,399 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 38 transitions. [2020-08-21 16:33:13,400 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-21 16:33:13,400 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:33:13,400 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 16:33:13,401 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-21 16:33:13,401 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:33:13,401 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:33:13,401 INFO L82 PathProgramCache]: Analyzing trace with hash -2142218371, now seen corresponding path program 9 times [2020-08-21 16:33:13,401 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:33:13,402 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [86454967] [2020-08-21 16:33:13,402 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:33:13,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:13,532 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:33:13,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:13,535 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2020-08-21 16:33:13,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:13,540 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 16:33:13,540 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [86454967] [2020-08-21 16:33:13,541 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:33:13,541 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 16:33:13,541 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [59369702] [2020-08-21 16:33:13,542 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 16:33:13,542 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:33:13,542 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 16:33:13,542 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2020-08-21 16:33:13,543 INFO L87 Difference]: Start difference. First operand 37 states and 38 transitions. Second operand 13 states. [2020-08-21 16:33:13,625 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:33:13,625 INFO L93 Difference]: Finished difference Result 52 states and 54 transitions. [2020-08-21 16:33:13,626 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-21 16:33:13,626 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 36 [2020-08-21 16:33:13,626 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:33:13,627 INFO L225 Difference]: With dead ends: 52 [2020-08-21 16:33:13,627 INFO L226 Difference]: Without dead ends: 40 [2020-08-21 16:33:13,628 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2020-08-21 16:33:13,628 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-21 16:33:13,632 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2020-08-21 16:33:13,632 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-21 16:33:13,633 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2020-08-21 16:33:13,633 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 36 [2020-08-21 16:33:13,633 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:33:13,633 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2020-08-21 16:33:13,634 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 16:33:13,634 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2020-08-21 16:33:13,634 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-21 16:33:13,635 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:33:13,635 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 16:33:13,635 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-21 16:33:13,635 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:33:13,635 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:33:13,636 INFO L82 PathProgramCache]: Analyzing trace with hash 758560159, now seen corresponding path program 10 times [2020-08-21 16:33:13,636 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:33:13,636 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [872439790] [2020-08-21 16:33:13,636 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:33:13,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:13,768 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:33:13,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:13,770 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 31 [2020-08-21 16:33:13,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:13,775 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 16:33:13,776 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [872439790] [2020-08-21 16:33:13,776 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:33:13,776 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-21 16:33:13,776 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1327728752] [2020-08-21 16:33:13,777 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-21 16:33:13,777 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:33:13,777 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-21 16:33:13,778 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2020-08-21 16:33:13,778 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 14 states. [2020-08-21 16:33:13,872 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:33:13,872 INFO L93 Difference]: Finished difference Result 54 states and 56 transitions. [2020-08-21 16:33:13,872 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-21 16:33:13,873 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 38 [2020-08-21 16:33:13,873 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:33:13,873 INFO L225 Difference]: With dead ends: 54 [2020-08-21 16:33:13,874 INFO L226 Difference]: Without dead ends: 42 [2020-08-21 16:33:13,874 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2020-08-21 16:33:13,875 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-21 16:33:13,878 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2020-08-21 16:33:13,879 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-21 16:33:13,879 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 42 transitions. [2020-08-21 16:33:13,879 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 42 transitions. Word has length 38 [2020-08-21 16:33:13,880 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:33:13,880 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 42 transitions. [2020-08-21 16:33:13,880 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-21 16:33:13,880 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 42 transitions. [2020-08-21 16:33:13,881 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-21 16:33:13,881 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:33:13,881 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 16:33:13,881 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-21 16:33:13,881 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:33:13,882 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:33:13,882 INFO L82 PathProgramCache]: Analyzing trace with hash 972952385, now seen corresponding path program 11 times [2020-08-21 16:33:13,882 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:33:13,882 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [983844065] [2020-08-21 16:33:13,882 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:33:13,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:14,052 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:33:14,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:14,055 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 33 [2020-08-21 16:33:14,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:14,060 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 16:33:14,061 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [983844065] [2020-08-21 16:33:14,061 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:33:14,061 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-21 16:33:14,061 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1346205751] [2020-08-21 16:33:14,062 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-21 16:33:14,062 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:33:14,062 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-21 16:33:14,063 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2020-08-21 16:33:14,063 INFO L87 Difference]: Start difference. First operand 41 states and 42 transitions. Second operand 15 states. [2020-08-21 16:33:14,159 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:33:14,159 INFO L93 Difference]: Finished difference Result 56 states and 58 transitions. [2020-08-21 16:33:14,160 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-21 16:33:14,160 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 40 [2020-08-21 16:33:14,160 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:33:14,161 INFO L225 Difference]: With dead ends: 56 [2020-08-21 16:33:14,161 INFO L226 Difference]: Without dead ends: 44 [2020-08-21 16:33:14,161 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 16:33:14,162 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-21 16:33:14,165 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2020-08-21 16:33:14,166 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-21 16:33:14,166 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 44 transitions. [2020-08-21 16:33:14,166 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 44 transitions. Word has length 40 [2020-08-21 16:33:14,167 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:33:14,167 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 44 transitions. [2020-08-21 16:33:14,167 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-21 16:33:14,167 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 44 transitions. [2020-08-21 16:33:14,168 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-21 16:33:14,168 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:33:14,168 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 16:33:14,168 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-21 16:33:14,169 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:33:14,169 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:33:14,169 INFO L82 PathProgramCache]: Analyzing trace with hash 845451363, now seen corresponding path program 12 times [2020-08-21 16:33:14,169 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:33:14,169 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [975112625] [2020-08-21 16:33:14,170 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:33:14,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:14,341 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:33:14,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:14,343 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 35 [2020-08-21 16:33:14,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:14,349 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 16:33:14,349 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [975112625] [2020-08-21 16:33:14,349 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:33:14,350 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-21 16:33:14,350 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [26220741] [2020-08-21 16:33:14,350 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-21 16:33:14,351 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:33:14,351 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-21 16:33:14,351 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2020-08-21 16:33:14,351 INFO L87 Difference]: Start difference. First operand 43 states and 44 transitions. Second operand 16 states. [2020-08-21 16:33:14,442 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:33:14,443 INFO L93 Difference]: Finished difference Result 58 states and 60 transitions. [2020-08-21 16:33:14,443 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-21 16:33:14,443 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 42 [2020-08-21 16:33:14,444 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:33:14,444 INFO L225 Difference]: With dead ends: 58 [2020-08-21 16:33:14,444 INFO L226 Difference]: Without dead ends: 46 [2020-08-21 16:33:14,445 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 16:33:14,445 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-21 16:33:14,449 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2020-08-21 16:33:14,449 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-21 16:33:14,450 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 46 transitions. [2020-08-21 16:33:14,450 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 46 transitions. Word has length 42 [2020-08-21 16:33:14,450 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:33:14,451 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 46 transitions. [2020-08-21 16:33:14,451 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-21 16:33:14,451 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 46 transitions. [2020-08-21 16:33:14,451 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-21 16:33:14,452 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:33:14,452 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 16:33:14,452 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-21 16:33:14,452 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:33:14,452 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:33:14,453 INFO L82 PathProgramCache]: Analyzing trace with hash -1423946491, now seen corresponding path program 13 times [2020-08-21 16:33:14,453 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:33:14,453 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [530957769] [2020-08-21 16:33:14,453 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:33:14,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:14,626 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:33:14,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:14,629 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2020-08-21 16:33:14,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:14,635 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 16:33:14,635 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [530957769] [2020-08-21 16:33:14,635 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:33:14,636 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-21 16:33:14,636 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [861279634] [2020-08-21 16:33:14,636 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-21 16:33:14,636 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:33:14,637 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-21 16:33:14,637 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2020-08-21 16:33:14,637 INFO L87 Difference]: Start difference. First operand 45 states and 46 transitions. Second operand 17 states. [2020-08-21 16:33:14,756 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:33:14,756 INFO L93 Difference]: Finished difference Result 60 states and 62 transitions. [2020-08-21 16:33:14,757 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-21 16:33:14,757 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 44 [2020-08-21 16:33:14,758 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:33:14,758 INFO L225 Difference]: With dead ends: 60 [2020-08-21 16:33:14,759 INFO L226 Difference]: Without dead ends: 48 [2020-08-21 16:33:14,759 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 16:33:14,762 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-21 16:33:14,765 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 47. [2020-08-21 16:33:14,771 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-21 16:33:14,771 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 48 transitions. [2020-08-21 16:33:14,772 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 48 transitions. Word has length 44 [2020-08-21 16:33:14,772 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:33:14,782 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 48 transitions. [2020-08-21 16:33:14,782 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-21 16:33:14,782 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 48 transitions. [2020-08-21 16:33:14,783 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-21 16:33:14,783 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:33:14,783 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 16:33:14,783 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-21 16:33:14,783 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:33:14,783 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:33:14,784 INFO L82 PathProgramCache]: Analyzing trace with hash -471897817, now seen corresponding path program 14 times [2020-08-21 16:33:14,785 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:33:14,786 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [885386473] [2020-08-21 16:33:14,786 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:33:14,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:15,018 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:33:15,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:15,021 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 39 [2020-08-21 16:33:15,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:15,028 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 16:33:15,029 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [885386473] [2020-08-21 16:33:15,030 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:33:15,031 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-21 16:33:15,031 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2056599894] [2020-08-21 16:33:15,031 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-21 16:33:15,032 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:33:15,032 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-21 16:33:15,032 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2020-08-21 16:33:15,032 INFO L87 Difference]: Start difference. First operand 47 states and 48 transitions. Second operand 18 states. [2020-08-21 16:33:15,131 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:33:15,132 INFO L93 Difference]: Finished difference Result 62 states and 64 transitions. [2020-08-21 16:33:15,132 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-21 16:33:15,132 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 46 [2020-08-21 16:33:15,133 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:33:15,133 INFO L225 Difference]: With dead ends: 62 [2020-08-21 16:33:15,133 INFO L226 Difference]: Without dead ends: 50 [2020-08-21 16:33:15,134 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 16:33:15,134 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-08-21 16:33:15,140 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 49. [2020-08-21 16:33:15,140 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-21 16:33:15,141 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 50 transitions. [2020-08-21 16:33:15,141 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 50 transitions. Word has length 46 [2020-08-21 16:33:15,141 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:33:15,141 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 50 transitions. [2020-08-21 16:33:15,141 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-21 16:33:15,142 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 50 transitions. [2020-08-21 16:33:15,142 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-21 16:33:15,142 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:33:15,142 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 16:33:15,143 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-21 16:33:15,143 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:33:15,143 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:33:15,143 INFO L82 PathProgramCache]: Analyzing trace with hash -381156151, now seen corresponding path program 15 times [2020-08-21 16:33:15,143 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:33:15,144 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2146984393] [2020-08-21 16:33:15,144 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:33:15,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:15,340 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:33:15,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:15,343 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 41 [2020-08-21 16:33:15,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:15,348 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 16:33:15,348 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2146984393] [2020-08-21 16:33:15,349 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:33:15,349 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-21 16:33:15,349 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [728458150] [2020-08-21 16:33:15,349 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-21 16:33:15,350 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:33:15,350 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-21 16:33:15,350 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2020-08-21 16:33:15,350 INFO L87 Difference]: Start difference. First operand 49 states and 50 transitions. Second operand 19 states. [2020-08-21 16:33:15,438 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:33:15,439 INFO L93 Difference]: Finished difference Result 64 states and 66 transitions. [2020-08-21 16:33:15,439 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-21 16:33:15,439 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 48 [2020-08-21 16:33:15,440 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:33:15,440 INFO L225 Difference]: With dead ends: 64 [2020-08-21 16:33:15,440 INFO L226 Difference]: Without dead ends: 52 [2020-08-21 16:33:15,441 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 16:33:15,441 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-21 16:33:15,445 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2020-08-21 16:33:15,445 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-21 16:33:15,446 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 52 transitions. [2020-08-21 16:33:15,446 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 52 transitions. Word has length 48 [2020-08-21 16:33:15,446 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:33:15,446 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 52 transitions. [2020-08-21 16:33:15,446 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-21 16:33:15,446 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 52 transitions. [2020-08-21 16:33:15,447 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-21 16:33:15,447 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:33:15,447 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 16:33:15,447 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-21 16:33:15,448 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:33:15,448 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:33:15,448 INFO L82 PathProgramCache]: Analyzing trace with hash 922238955, now seen corresponding path program 16 times [2020-08-21 16:33:15,448 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:33:15,448 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1599284850] [2020-08-21 16:33:15,449 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:33:15,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:15,690 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:33:15,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:15,712 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 43 [2020-08-21 16:33:15,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:15,720 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 16:33:15,720 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1599284850] [2020-08-21 16:33:15,720 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:33:15,720 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-21 16:33:15,721 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1830599908] [2020-08-21 16:33:15,723 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-21 16:33:15,723 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:33:15,725 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-21 16:33:15,729 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2020-08-21 16:33:15,730 INFO L87 Difference]: Start difference. First operand 51 states and 52 transitions. Second operand 20 states. [2020-08-21 16:33:15,834 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:33:15,834 INFO L93 Difference]: Finished difference Result 66 states and 68 transitions. [2020-08-21 16:33:15,834 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-21 16:33:15,835 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 50 [2020-08-21 16:33:15,835 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:33:15,836 INFO L225 Difference]: With dead ends: 66 [2020-08-21 16:33:15,836 INFO L226 Difference]: Without dead ends: 54 [2020-08-21 16:33:15,837 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 16:33:15,838 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-21 16:33:15,846 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2020-08-21 16:33:15,849 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-21 16:33:15,850 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 54 transitions. [2020-08-21 16:33:15,850 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 54 transitions. Word has length 50 [2020-08-21 16:33:15,850 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:33:15,850 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 54 transitions. [2020-08-21 16:33:15,851 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-21 16:33:15,851 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 54 transitions. [2020-08-21 16:33:15,851 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-21 16:33:15,851 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:33:15,853 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 16:33:15,853 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-21 16:33:15,854 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:33:15,854 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:33:15,854 INFO L82 PathProgramCache]: Analyzing trace with hash -645514611, now seen corresponding path program 17 times [2020-08-21 16:33:15,854 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:33:15,855 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [643614815] [2020-08-21 16:33:15,855 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:33:15,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:16,128 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:33:16,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:16,133 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 45 [2020-08-21 16:33:16,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:16,140 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 16:33:16,141 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [643614815] [2020-08-21 16:33:16,141 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:33:16,141 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-21 16:33:16,142 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [551586447] [2020-08-21 16:33:16,142 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-21 16:33:16,142 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:33:16,143 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-21 16:33:16,143 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2020-08-21 16:33:16,143 INFO L87 Difference]: Start difference. First operand 53 states and 54 transitions. Second operand 21 states. [2020-08-21 16:33:16,266 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:33:16,266 INFO L93 Difference]: Finished difference Result 68 states and 70 transitions. [2020-08-21 16:33:16,266 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-21 16:33:16,267 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 52 [2020-08-21 16:33:16,267 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:33:16,268 INFO L225 Difference]: With dead ends: 68 [2020-08-21 16:33:16,268 INFO L226 Difference]: Without dead ends: 56 [2020-08-21 16:33:16,269 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 16:33:16,269 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-08-21 16:33:16,272 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2020-08-21 16:33:16,272 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-21 16:33:16,273 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 56 transitions. [2020-08-21 16:33:16,273 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 56 transitions. Word has length 52 [2020-08-21 16:33:16,273 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:33:16,273 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 56 transitions. [2020-08-21 16:33:16,273 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-21 16:33:16,274 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 56 transitions. [2020-08-21 16:33:16,274 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-21 16:33:16,274 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:33:16,274 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 16:33:16,275 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-21 16:33:16,275 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:33:16,275 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:33:16,275 INFO L82 PathProgramCache]: Analyzing trace with hash 276829359, now seen corresponding path program 18 times [2020-08-21 16:33:16,275 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:33:16,276 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1663313029] [2020-08-21 16:33:16,276 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:33:16,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:16,536 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:33:16,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:16,539 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 47 [2020-08-21 16:33:16,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:16,544 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 16:33:16,545 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1663313029] [2020-08-21 16:33:16,545 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:33:16,545 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-21 16:33:16,545 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [86614870] [2020-08-21 16:33:16,546 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-21 16:33:16,546 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:33:16,546 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-21 16:33:16,546 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2020-08-21 16:33:16,547 INFO L87 Difference]: Start difference. First operand 55 states and 56 transitions. Second operand 22 states. [2020-08-21 16:33:16,662 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:33:16,662 INFO L93 Difference]: Finished difference Result 70 states and 72 transitions. [2020-08-21 16:33:16,662 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-21 16:33:16,663 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 54 [2020-08-21 16:33:16,663 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:33:16,664 INFO L225 Difference]: With dead ends: 70 [2020-08-21 16:33:16,664 INFO L226 Difference]: Without dead ends: 58 [2020-08-21 16:33:16,665 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 16:33:16,666 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-21 16:33:16,669 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2020-08-21 16:33:16,669 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-21 16:33:16,669 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 58 transitions. [2020-08-21 16:33:16,670 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 58 transitions. Word has length 54 [2020-08-21 16:33:16,670 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:33:16,670 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 58 transitions. [2020-08-21 16:33:16,670 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-21 16:33:16,670 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 58 transitions. [2020-08-21 16:33:16,671 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-21 16:33:16,671 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:33:16,671 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 16:33:16,671 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-21 16:33:16,672 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:33:16,672 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:33:16,672 INFO L82 PathProgramCache]: Analyzing trace with hash 1886121553, now seen corresponding path program 19 times [2020-08-21 16:33:16,672 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:33:16,672 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [754801137] [2020-08-21 16:33:16,673 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:33:16,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:16,971 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:33:16,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:16,974 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 49 [2020-08-21 16:33:16,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:16,979 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 16:33:16,979 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [754801137] [2020-08-21 16:33:16,979 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:33:16,980 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-21 16:33:16,980 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2133567620] [2020-08-21 16:33:16,980 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-21 16:33:16,980 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:33:16,981 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-21 16:33:16,981 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2020-08-21 16:33:16,981 INFO L87 Difference]: Start difference. First operand 57 states and 58 transitions. Second operand 23 states. [2020-08-21 16:33:17,190 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:33:17,191 INFO L93 Difference]: Finished difference Result 71 states and 73 transitions. [2020-08-21 16:33:17,191 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-21 16:33:17,191 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 56 [2020-08-21 16:33:17,192 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:33:17,192 INFO L225 Difference]: With dead ends: 71 [2020-08-21 16:33:17,192 INFO L226 Difference]: Without dead ends: 59 [2020-08-21 16:33:17,193 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 16:33:17,194 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-08-21 16:33:17,196 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2020-08-21 16:33:17,197 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-08-21 16:33:17,197 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 60 transitions. [2020-08-21 16:33:17,197 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 60 transitions. Word has length 56 [2020-08-21 16:33:17,198 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:33:17,198 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 60 transitions. [2020-08-21 16:33:17,198 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-21 16:33:17,198 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 60 transitions. [2020-08-21 16:33:17,198 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-08-21 16:33:17,199 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:33:17,199 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 16:33:17,199 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-21 16:33:17,199 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:33:17,199 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:33:17,200 INFO L82 PathProgramCache]: Analyzing trace with hash -2067273869, now seen corresponding path program 20 times [2020-08-21 16:33:17,200 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:33:17,200 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1391483517] [2020-08-21 16:33:17,200 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:33:17,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-21 16:33:17,299 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-08-21 16:33:17,299 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-21 16:33:17,304 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-21 16:33:17,330 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.08 04:33:17 BoogieIcfgContainer [2020-08-21 16:33:17,330 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-21 16:33:17,333 INFO L168 Benchmark]: Toolchain (without parser) took 7216.82 ms. Allocated memory was 140.5 MB in the beginning and 303.0 MB in the end (delta: 162.5 MB). Free memory was 103.7 MB in the beginning and 170.0 MB in the end (delta: -66.4 MB). Peak memory consumption was 96.2 MB. Max. memory is 7.1 GB. [2020-08-21 16:33:17,334 INFO L168 Benchmark]: CDTParser took 0.22 ms. Allocated memory is still 140.5 MB. Free memory was 122.0 MB in the beginning and 121.8 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. [2020-08-21 16:33:17,335 INFO L168 Benchmark]: CACSL2BoogieTranslator took 380.59 ms. Allocated memory was 140.5 MB in the beginning and 203.4 MB in the end (delta: 62.9 MB). Free memory was 103.5 MB in the beginning and 182.3 MB in the end (delta: -78.9 MB). Peak memory consumption was 22.2 MB. Max. memory is 7.1 GB. [2020-08-21 16:33:17,335 INFO L168 Benchmark]: Boogie Preprocessor took 45.65 ms. Allocated memory is still 203.4 MB. Free memory was 182.3 MB in the beginning and 180.0 MB in the end (delta: 2.4 MB). Peak memory consumption was 2.4 MB. Max. memory is 7.1 GB. [2020-08-21 16:33:17,336 INFO L168 Benchmark]: RCFGBuilder took 495.06 ms. Allocated memory is still 203.4 MB. Free memory was 180.0 MB in the beginning and 164.6 MB in the end (delta: 15.4 MB). Peak memory consumption was 15.4 MB. Max. memory is 7.1 GB. [2020-08-21 16:33:17,337 INFO L168 Benchmark]: TraceAbstraction took 6290.65 ms. Allocated memory was 203.4 MB in the beginning and 303.0 MB in the end (delta: 99.6 MB). Free memory was 163.9 MB in the beginning and 170.0 MB in the end (delta: -6.2 MB). Peak memory consumption was 93.5 MB. Max. memory is 7.1 GB. [2020-08-21 16:33:17,339 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.22 ms. Allocated memory is still 140.5 MB. Free memory was 122.0 MB in the beginning and 121.8 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 380.59 ms. Allocated memory was 140.5 MB in the beginning and 203.4 MB in the end (delta: 62.9 MB). Free memory was 103.5 MB in the beginning and 182.3 MB in the end (delta: -78.9 MB). Peak memory consumption was 22.2 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 45.65 ms. Allocated memory is still 203.4 MB. Free memory was 182.3 MB in the beginning and 180.0 MB in the end (delta: 2.4 MB). Peak memory consumption was 2.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 495.06 ms. Allocated memory is still 203.4 MB. Free memory was 180.0 MB in the beginning and 164.6 MB in the end (delta: 15.4 MB). Peak memory consumption was 15.4 MB. Max. memory is 7.1 GB. * TraceAbstraction took 6290.65 ms. Allocated memory was 203.4 MB in the beginning and 303.0 MB in the end (delta: 99.6 MB). Free memory was 163.9 MB in the beginning and 170.0 MB in the end (delta: -6.2 MB). Peak memory consumption was 93.5 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: 6.2s, OverallIterations: 22, TraceHistogramMax: 20, AutomataDifference: 2.0s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 365 SDtfs, 252 SDslu, 1934 SDs, 0 SdLazy, 1339 SolverSat, 72 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.3s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 336 GetRequests, 105 SyntacticMatches, 0 SemanticMatches, 231 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 190 ImplicationChecksByTransitivity, 2.3s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=59occurred in iteration=21, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 21 MinimizatonAttempts, 19 StatesRemovedByMinimization, 19 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.5s SatisfiabilityAnalysisTime, 3.0s 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...