./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/recursive/gcd01-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 20ed64ec Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx15G -Xms4m -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/AutomizerReach.xml -i ../sv-benchmarks/c/recursive/gcd01-1.c -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash d6f4e1dd3818e9d3e8c54653af66359ead501b84 ...................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Writing output log to file Ultimate.log Result: TRUE --- Real Ultimate output --- This is Ultimate 0.2.1-dev-20ed64e [2021-08-26 08:45:59,560 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-08-26 08:45:59,562 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-08-26 08:45:59,592 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-08-26 08:45:59,592 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-08-26 08:45:59,595 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-08-26 08:45:59,596 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-08-26 08:45:59,600 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-08-26 08:45:59,604 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-08-26 08:45:59,607 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-08-26 08:45:59,608 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-08-26 08:45:59,609 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-08-26 08:45:59,609 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-08-26 08:45:59,611 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-08-26 08:45:59,613 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-08-26 08:45:59,614 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-08-26 08:45:59,615 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-08-26 08:45:59,615 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-08-26 08:45:59,616 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-08-26 08:45:59,617 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-08-26 08:45:59,618 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-08-26 08:45:59,621 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-08-26 08:45:59,622 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-08-26 08:45:59,622 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-08-26 08:45:59,624 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-08-26 08:45:59,624 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-08-26 08:45:59,624 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-08-26 08:45:59,625 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-08-26 08:45:59,625 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-08-26 08:45:59,625 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-08-26 08:45:59,626 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-08-26 08:45:59,626 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-08-26 08:45:59,627 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-08-26 08:45:59,627 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-08-26 08:45:59,628 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-08-26 08:45:59,628 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-08-26 08:45:59,628 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-08-26 08:45:59,629 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-08-26 08:45:59,629 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-08-26 08:45:59,629 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-08-26 08:45:59,630 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-08-26 08:45:59,631 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2021-08-26 08:45:59,662 INFO L113 SettingsManager]: Loading preferences was successful [2021-08-26 08:45:59,663 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-08-26 08:45:59,663 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-08-26 08:45:59,663 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-08-26 08:45:59,664 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-08-26 08:45:59,664 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-08-26 08:45:59,664 INFO L138 SettingsManager]: * Use SBE=true [2021-08-26 08:45:59,664 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-08-26 08:45:59,664 INFO L138 SettingsManager]: * sizeof long=4 [2021-08-26 08:45:59,664 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-08-26 08:45:59,665 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-08-26 08:45:59,665 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-08-26 08:45:59,665 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-08-26 08:45:59,665 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-08-26 08:45:59,665 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-08-26 08:45:59,665 INFO L138 SettingsManager]: * sizeof long double=12 [2021-08-26 08:45:59,665 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-08-26 08:45:59,665 INFO L138 SettingsManager]: * Use constant arrays=true [2021-08-26 08:45:59,665 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-08-26 08:45:59,666 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-08-26 08:45:59,666 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-08-26 08:45:59,666 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-08-26 08:45:59,666 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-08-26 08:45:59,666 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-08-26 08:45:59,666 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-08-26 08:45:59,666 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-08-26 08:45:59,666 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-08-26 08:45:59,667 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-08-26 08:45:59,667 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-08-26 08:45:59,667 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-08-26 08:45:59,667 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> d6f4e1dd3818e9d3e8c54653af66359ead501b84 [2021-08-26 08:45:59,901 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-08-26 08:45:59,915 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-08-26 08:45:59,917 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-08-26 08:45:59,918 INFO L271 PluginConnector]: Initializing CDTParser... [2021-08-26 08:45:59,918 INFO L275 PluginConnector]: CDTParser initialized [2021-08-26 08:45:59,919 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/recursive/gcd01-1.c [2021-08-26 08:45:59,961 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/65ae5341d/9b71096f76e141fdba5c90f5c429b58e/FLAGb5df1fb50 [2021-08-26 08:46:00,277 INFO L306 CDTParser]: Found 1 translation units. [2021-08-26 08:46:00,278 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/recursive/gcd01-1.c [2021-08-26 08:46:00,282 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/65ae5341d/9b71096f76e141fdba5c90f5c429b58e/FLAGb5df1fb50 [2021-08-26 08:46:00,693 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/65ae5341d/9b71096f76e141fdba5c90f5c429b58e [2021-08-26 08:46:00,698 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-08-26 08:46:00,700 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-08-26 08:46:00,702 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-08-26 08:46:00,702 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-08-26 08:46:00,704 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-08-26 08:46:00,705 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.08 08:46:00" (1/1) ... [2021-08-26 08:46:00,706 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@55713a26 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 08:46:00, skipping insertion in model container [2021-08-26 08:46:00,706 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.08 08:46:00" (1/1) ... [2021-08-26 08:46:00,710 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-08-26 08:46:00,719 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-08-26 08:46:00,811 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/recursive/gcd01-1.c[1008,1021] [2021-08-26 08:46:00,813 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-08-26 08:46:00,823 INFO L203 MainTranslator]: Completed pre-run [2021-08-26 08:46:00,838 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/recursive/gcd01-1.c[1008,1021] [2021-08-26 08:46:00,839 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-08-26 08:46:00,873 INFO L208 MainTranslator]: Completed translation [2021-08-26 08:46:00,873 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 08:46:00 WrapperNode [2021-08-26 08:46:00,873 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-08-26 08:46:00,878 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-08-26 08:46:00,879 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-08-26 08:46:00,879 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-08-26 08:46:00,883 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 08:46:00" (1/1) ... [2021-08-26 08:46:00,889 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 08:46:00" (1/1) ... [2021-08-26 08:46:00,902 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-08-26 08:46:00,903 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-08-26 08:46:00,903 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-08-26 08:46:00,903 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-08-26 08:46:00,908 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 08:46:00" (1/1) ... [2021-08-26 08:46:00,908 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 08:46:00" (1/1) ... [2021-08-26 08:46:00,917 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 08:46:00" (1/1) ... [2021-08-26 08:46:00,917 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 08:46:00" (1/1) ... [2021-08-26 08:46:00,924 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 08:46:00" (1/1) ... [2021-08-26 08:46:00,929 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 08:46:00" (1/1) ... [2021-08-26 08:46:00,929 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 08:46:00" (1/1) ... [2021-08-26 08:46:00,931 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-08-26 08:46:00,932 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-08-26 08:46:00,932 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-08-26 08:46:00,932 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-08-26 08:46:00,933 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 08:46:00" (1/1) ... [2021-08-26 08:46:00,937 INFO L170 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-08-26 08:46:00,943 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-26 08:46:00,953 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-08-26 08:46:00,963 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-08-26 08:46:00,990 INFO L130 BoogieDeclarations]: Found specification of procedure gcd [2021-08-26 08:46:00,991 INFO L138 BoogieDeclarations]: Found implementation of procedure gcd [2021-08-26 08:46:00,991 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-08-26 08:46:00,991 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-08-26 08:46:00,991 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-08-26 08:46:00,992 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-08-26 08:46:01,210 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-08-26 08:46:01,210 INFO L299 CfgBuilder]: Removed 4 assume(true) statements. [2021-08-26 08:46:01,215 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.08 08:46:01 BoogieIcfgContainer [2021-08-26 08:46:01,215 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-08-26 08:46:01,216 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-08-26 08:46:01,217 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-08-26 08:46:01,219 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-08-26 08:46:01,219 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 26.08 08:46:00" (1/3) ... [2021-08-26 08:46:01,219 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@65487c95 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.08 08:46:01, skipping insertion in model container [2021-08-26 08:46:01,220 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 08:46:00" (2/3) ... [2021-08-26 08:46:01,220 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@65487c95 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.08 08:46:01, skipping insertion in model container [2021-08-26 08:46:01,221 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.08 08:46:01" (3/3) ... [2021-08-26 08:46:01,221 INFO L111 eAbstractionObserver]: Analyzing ICFG gcd01-1.c [2021-08-26 08:46:01,228 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-08-26 08:46:01,228 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-08-26 08:46:01,265 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-08-26 08:46:01,275 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-08-26 08:46:01,275 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-08-26 08:46:01,289 INFO L276 IsEmpty]: Start isEmpty. Operand has 22 states, 16 states have (on average 1.4375) internal successors, (23), 17 states have internal predecessors, (23), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-08-26 08:46:01,292 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-08-26 08:46:01,293 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 08:46:01,293 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 08:46:01,294 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 08:46:01,297 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 08:46:01,298 INFO L82 PathProgramCache]: Analyzing trace with hash -697503145, now seen corresponding path program 1 times [2021-08-26 08:46:01,310 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 08:46:01,310 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1617816666] [2021-08-26 08:46:01,310 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 08:46:01,311 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 08:46:01,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 08:46:01,518 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2021-08-26 08:46:01,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 08:46:01,587 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-26 08:46:01,588 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 08:46:01,588 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1617816666] [2021-08-26 08:46:01,589 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1617816666] provided 1 perfect and 0 imperfect interpolant sequences [2021-08-26 08:46:01,589 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-08-26 08:46:01,589 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-08-26 08:46:01,591 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1651056531] [2021-08-26 08:46:01,594 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-08-26 08:46:01,594 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 08:46:01,603 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-08-26 08:46:01,604 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-08-26 08:46:01,605 INFO L87 Difference]: Start difference. First operand has 22 states, 16 states have (on average 1.4375) internal successors, (23), 17 states have internal predecessors, (23), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 6 states, 5 states have (on average 2.0) internal successors, (10), 6 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-08-26 08:46:01,706 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 08:46:01,706 INFO L93 Difference]: Finished difference Result 37 states and 44 transitions. [2021-08-26 08:46:01,707 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-08-26 08:46:01,708 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 2.0) internal successors, (10), 6 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2021-08-26 08:46:01,708 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 08:46:01,713 INFO L225 Difference]: With dead ends: 37 [2021-08-26 08:46:01,713 INFO L226 Difference]: Without dead ends: 21 [2021-08-26 08:46:01,715 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 58.6ms TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-08-26 08:46:01,724 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-08-26 08:46:01,743 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2021-08-26 08:46:01,744 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 15 states have (on average 1.2) internal successors, (18), 16 states have internal predecessors, (18), 3 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-08-26 08:46:01,745 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 26 transitions. [2021-08-26 08:46:01,746 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 26 transitions. Word has length 12 [2021-08-26 08:46:01,746 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 08:46:01,746 INFO L470 AbstractCegarLoop]: Abstraction has 21 states and 26 transitions. [2021-08-26 08:46:01,746 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 2.0) internal successors, (10), 6 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-08-26 08:46:01,747 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 26 transitions. [2021-08-26 08:46:01,748 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-08-26 08:46:01,748 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 08:46:01,748 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 08:46:01,748 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-08-26 08:46:01,748 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 08:46:01,749 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 08:46:01,749 INFO L82 PathProgramCache]: Analyzing trace with hash 424402023, now seen corresponding path program 1 times [2021-08-26 08:46:01,749 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 08:46:01,749 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1391220158] [2021-08-26 08:46:01,750 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 08:46:01,750 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 08:46:01,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 08:46:01,786 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2021-08-26 08:46:01,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 08:46:01,830 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-26 08:46:01,830 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 08:46:01,831 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1391220158] [2021-08-26 08:46:01,831 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1391220158] provided 1 perfect and 0 imperfect interpolant sequences [2021-08-26 08:46:01,831 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-08-26 08:46:01,831 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-08-26 08:46:01,832 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [521209776] [2021-08-26 08:46:01,833 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-08-26 08:46:01,833 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 08:46:01,834 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-08-26 08:46:01,834 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-08-26 08:46:01,835 INFO L87 Difference]: Start difference. First operand 21 states and 26 transitions. Second operand has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 5 states have internal predecessors, (11), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-08-26 08:46:01,891 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 08:46:01,891 INFO L93 Difference]: Finished difference Result 27 states and 33 transitions. [2021-08-26 08:46:01,892 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-08-26 08:46:01,893 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 5 states have internal predecessors, (11), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 13 [2021-08-26 08:46:01,893 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 08:46:01,894 INFO L225 Difference]: With dead ends: 27 [2021-08-26 08:46:01,894 INFO L226 Difference]: Without dead ends: 23 [2021-08-26 08:46:01,895 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 32.9ms TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-08-26 08:46:01,895 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-08-26 08:46:01,902 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2021-08-26 08:46:01,904 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 15 states have (on average 1.2) internal successors, (18), 16 states have internal predecessors, (18), 3 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-08-26 08:46:01,905 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 26 transitions. [2021-08-26 08:46:01,905 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 26 transitions. Word has length 13 [2021-08-26 08:46:01,905 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 08:46:01,906 INFO L470 AbstractCegarLoop]: Abstraction has 21 states and 26 transitions. [2021-08-26 08:46:01,906 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 5 states have internal predecessors, (11), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-08-26 08:46:01,907 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 26 transitions. [2021-08-26 08:46:01,908 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-08-26 08:46:01,908 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 08:46:01,908 INFO L512 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 08:46:01,909 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-08-26 08:46:01,909 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 08:46:01,909 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 08:46:01,910 INFO L82 PathProgramCache]: Analyzing trace with hash 1186566545, now seen corresponding path program 1 times [2021-08-26 08:46:01,910 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 08:46:01,910 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [563728153] [2021-08-26 08:46:01,910 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 08:46:01,911 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 08:46:01,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 08:46:01,957 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2021-08-26 08:46:01,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 08:46:02,013 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2021-08-26 08:46:02,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 08:46:02,072 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-08-26 08:46:02,072 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 08:46:02,072 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [563728153] [2021-08-26 08:46:02,073 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [563728153] provided 1 perfect and 0 imperfect interpolant sequences [2021-08-26 08:46:02,077 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-08-26 08:46:02,077 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-08-26 08:46:02,077 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2003316971] [2021-08-26 08:46:02,078 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-08-26 08:46:02,079 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 08:46:02,079 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-08-26 08:46:02,079 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-08-26 08:46:02,080 INFO L87 Difference]: Start difference. First operand 21 states and 26 transitions. Second operand has 6 states, 5 states have (on average 3.2) internal successors, (16), 6 states have internal predecessors, (16), 2 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-08-26 08:46:02,208 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 08:46:02,208 INFO L93 Difference]: Finished difference Result 33 states and 42 transitions. [2021-08-26 08:46:02,209 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-08-26 08:46:02,209 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 3.2) internal successors, (16), 6 states have internal predecessors, (16), 2 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 20 [2021-08-26 08:46:02,210 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 08:46:02,211 INFO L225 Difference]: With dead ends: 33 [2021-08-26 08:46:02,211 INFO L226 Difference]: Without dead ends: 25 [2021-08-26 08:46:02,212 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 71.2ms TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-08-26 08:46:02,212 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-08-26 08:46:02,218 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 23. [2021-08-26 08:46:02,218 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 16 states have (on average 1.1875) internal successors, (19), 18 states have internal predecessors, (19), 3 states have call successors, (3), 1 states have call predecessors, (3), 3 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2021-08-26 08:46:02,219 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 28 transitions. [2021-08-26 08:46:02,219 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 28 transitions. Word has length 20 [2021-08-26 08:46:02,219 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 08:46:02,219 INFO L470 AbstractCegarLoop]: Abstraction has 23 states and 28 transitions. [2021-08-26 08:46:02,219 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 3.2) internal successors, (16), 6 states have internal predecessors, (16), 2 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-08-26 08:46:02,219 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 28 transitions. [2021-08-26 08:46:02,220 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-08-26 08:46:02,221 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 08:46:02,221 INFO L512 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 08:46:02,221 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-08-26 08:46:02,221 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 08:46:02,221 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 08:46:02,221 INFO L82 PathProgramCache]: Analyzing trace with hash -159193201, now seen corresponding path program 1 times [2021-08-26 08:46:02,222 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 08:46:02,222 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [691313987] [2021-08-26 08:46:02,222 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 08:46:02,222 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 08:46:02,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 08:46:02,262 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2021-08-26 08:46:02,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 08:46:02,324 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2021-08-26 08:46:02,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 08:46:02,368 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-08-26 08:46:02,368 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 08:46:02,368 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [691313987] [2021-08-26 08:46:02,371 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [691313987] provided 1 perfect and 0 imperfect interpolant sequences [2021-08-26 08:46:02,371 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-08-26 08:46:02,371 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-08-26 08:46:02,371 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1213532355] [2021-08-26 08:46:02,373 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-08-26 08:46:02,373 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 08:46:02,376 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-08-26 08:46:02,376 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-08-26 08:46:02,376 INFO L87 Difference]: Start difference. First operand 23 states and 28 transitions. Second operand has 7 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 7 states have internal predecessors, (16), 2 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-08-26 08:46:02,481 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 08:46:02,487 INFO L93 Difference]: Finished difference Result 33 states and 41 transitions. [2021-08-26 08:46:02,488 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-08-26 08:46:02,488 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 7 states have internal predecessors, (16), 2 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 20 [2021-08-26 08:46:02,489 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 08:46:02,490 INFO L225 Difference]: With dead ends: 33 [2021-08-26 08:46:02,490 INFO L226 Difference]: Without dead ends: 23 [2021-08-26 08:46:02,491 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 91.2ms TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2021-08-26 08:46:02,492 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-08-26 08:46:02,496 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2021-08-26 08:46:02,497 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 15 states have (on average 1.1333333333333333) internal successors, (17), 16 states have internal predecessors, (17), 3 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-08-26 08:46:02,497 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2021-08-26 08:46:02,497 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 20 [2021-08-26 08:46:02,497 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 08:46:02,498 INFO L470 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2021-08-26 08:46:02,498 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 7 states have internal predecessors, (16), 2 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-08-26 08:46:02,498 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2021-08-26 08:46:02,499 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-08-26 08:46:02,499 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 08:46:02,499 INFO L512 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 08:46:02,499 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-08-26 08:46:02,499 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 08:46:02,500 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 08:46:02,500 INFO L82 PathProgramCache]: Analyzing trace with hash -240281673, now seen corresponding path program 1 times [2021-08-26 08:46:02,500 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 08:46:02,500 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1597399352] [2021-08-26 08:46:02,500 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 08:46:02,500 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 08:46:02,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 08:46:02,553 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2021-08-26 08:46:02,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 08:46:02,584 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2021-08-26 08:46:02,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 08:46:02,610 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-08-26 08:46:02,610 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 08:46:02,610 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1597399352] [2021-08-26 08:46:02,610 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1597399352] provided 1 perfect and 0 imperfect interpolant sequences [2021-08-26 08:46:02,611 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-08-26 08:46:02,611 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-08-26 08:46:02,611 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [278596957] [2021-08-26 08:46:02,611 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-08-26 08:46:02,612 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 08:46:02,612 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-08-26 08:46:02,612 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-08-26 08:46:02,612 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 5 states have internal predecessors, (15), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-08-26 08:46:02,662 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 08:46:02,662 INFO L93 Difference]: Finished difference Result 28 states and 33 transitions. [2021-08-26 08:46:02,663 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-08-26 08:46:02,664 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 5 states have internal predecessors, (15), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 21 [2021-08-26 08:46:02,664 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 08:46:02,665 INFO L225 Difference]: With dead ends: 28 [2021-08-26 08:46:02,665 INFO L226 Difference]: Without dead ends: 24 [2021-08-26 08:46:02,666 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 43.9ms TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-08-26 08:46:02,666 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-08-26 08:46:02,669 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 22. [2021-08-26 08:46:02,669 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 16 states have (on average 1.125) internal successors, (18), 16 states have internal predecessors, (18), 3 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (5), 4 states have call predecessors, (5), 3 states have call successors, (5) [2021-08-26 08:46:02,669 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 26 transitions. [2021-08-26 08:46:02,670 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 26 transitions. Word has length 21 [2021-08-26 08:46:02,670 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 08:46:02,670 INFO L470 AbstractCegarLoop]: Abstraction has 22 states and 26 transitions. [2021-08-26 08:46:02,670 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 5 states have internal predecessors, (15), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-08-26 08:46:02,670 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 26 transitions. [2021-08-26 08:46:02,670 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-08-26 08:46:02,670 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 08:46:02,670 INFO L512 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 08:46:02,671 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-08-26 08:46:02,671 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 08:46:02,671 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 08:46:02,671 INFO L82 PathProgramCache]: Analyzing trace with hash 998569559, now seen corresponding path program 1 times [2021-08-26 08:46:02,671 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 08:46:02,671 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2043990698] [2021-08-26 08:46:02,671 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 08:46:02,671 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 08:46:02,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 08:46:02,698 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2021-08-26 08:46:02,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 08:46:02,739 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2021-08-26 08:46:02,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 08:46:02,750 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-08-26 08:46:02,750 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 08:46:02,751 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2043990698] [2021-08-26 08:46:02,751 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2043990698] provided 1 perfect and 0 imperfect interpolant sequences [2021-08-26 08:46:02,751 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-08-26 08:46:02,751 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-08-26 08:46:02,751 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [168562489] [2021-08-26 08:46:02,751 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-08-26 08:46:02,752 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 08:46:02,752 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-08-26 08:46:02,752 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-08-26 08:46:02,752 INFO L87 Difference]: Start difference. First operand 22 states and 26 transitions. Second operand has 7 states, 7 states have (on average 2.0) internal successors, (14), 5 states have internal predecessors, (14), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-08-26 08:46:02,803 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 08:46:02,803 INFO L93 Difference]: Finished difference Result 31 states and 37 transitions. [2021-08-26 08:46:02,804 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-08-26 08:46:02,804 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.0) internal successors, (14), 5 states have internal predecessors, (14), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 21 [2021-08-26 08:46:02,804 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 08:46:02,805 INFO L225 Difference]: With dead ends: 31 [2021-08-26 08:46:02,805 INFO L226 Difference]: Without dead ends: 27 [2021-08-26 08:46:02,805 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 46.7ms TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-08-26 08:46:02,805 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-08-26 08:46:02,807 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2021-08-26 08:46:02,807 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 19 states have (on average 1.105263157894737) internal successors, (21), 20 states have internal predecessors, (21), 3 states have call successors, (3), 1 states have call predecessors, (3), 4 states have return successors, (9), 5 states have call predecessors, (9), 3 states have call successors, (9) [2021-08-26 08:46:02,808 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 33 transitions. [2021-08-26 08:46:02,808 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 33 transitions. Word has length 21 [2021-08-26 08:46:02,808 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 08:46:02,808 INFO L470 AbstractCegarLoop]: Abstraction has 27 states and 33 transitions. [2021-08-26 08:46:02,809 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.0) internal successors, (14), 5 states have internal predecessors, (14), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-08-26 08:46:02,809 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 33 transitions. [2021-08-26 08:46:02,809 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-08-26 08:46:02,809 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 08:46:02,809 INFO L512 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 08:46:02,810 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-08-26 08:46:02,810 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 08:46:02,810 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 08:46:02,810 INFO L82 PathProgramCache]: Analyzing trace with hash -1123136249, now seen corresponding path program 1 times [2021-08-26 08:46:02,810 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 08:46:02,810 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2041390589] [2021-08-26 08:46:02,811 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 08:46:02,811 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 08:46:02,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 08:46:02,836 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2021-08-26 08:46:02,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 08:46:02,861 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2021-08-26 08:46:02,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 08:46:02,880 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2021-08-26 08:46:02,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 08:46:02,921 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-08-26 08:46:02,921 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 08:46:02,922 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2041390589] [2021-08-26 08:46:02,922 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2041390589] provided 1 perfect and 0 imperfect interpolant sequences [2021-08-26 08:46:02,922 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-08-26 08:46:02,922 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-08-26 08:46:02,922 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1707271264] [2021-08-26 08:46:02,922 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-08-26 08:46:02,922 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 08:46:02,922 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-08-26 08:46:02,923 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-08-26 08:46:02,923 INFO L87 Difference]: Start difference. First operand 27 states and 33 transitions. Second operand has 8 states, 8 states have (on average 2.125) internal successors, (17), 5 states have internal predecessors, (17), 1 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 1 states have call successors, (3) [2021-08-26 08:46:03,017 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 08:46:03,018 INFO L93 Difference]: Finished difference Result 27 states and 33 transitions. [2021-08-26 08:46:03,018 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-08-26 08:46:03,018 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.125) internal successors, (17), 5 states have internal predecessors, (17), 1 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 1 states have call successors, (3) Word has length 29 [2021-08-26 08:46:03,020 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 08:46:03,020 INFO L225 Difference]: With dead ends: 27 [2021-08-26 08:46:03,020 INFO L226 Difference]: Without dead ends: 0 [2021-08-26 08:46:03,021 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 89.4ms TimeCoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-08-26 08:46:03,021 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2021-08-26 08:46:03,021 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2021-08-26 08:46:03,021 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 0 states, 0 states have (on average 0.0) internal successors, (0), 0 states have internal predecessors, (0), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-26 08:46:03,021 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2021-08-26 08:46:03,021 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 29 [2021-08-26 08:46:03,021 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 08:46:03,022 INFO L470 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2021-08-26 08:46:03,023 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.125) internal successors, (17), 5 states have internal predecessors, (17), 1 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 1 states have call successors, (3) [2021-08-26 08:46:03,023 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2021-08-26 08:46:03,023 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2021-08-26 08:46:03,025 INFO L764 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION [2021-08-26 08:46:03,026 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-08-26 08:46:03,027 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2021-08-26 08:46:03,030 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-08-26 08:46:03,033 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-08-26 08:46:03,035 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-08-26 08:46:03,037 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-08-26 08:46:03,038 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-08-26 08:46:03,039 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-08-26 08:46:03,041 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-08-26 08:46:03,042 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-08-26 08:46:03,043 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-08-26 08:46:03,043 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-08-26 08:46:03,044 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-08-26 08:46:03,095 INFO L857 garLoopResultBuilder]: For program point gcdFINAL(lines 17 28) no Hoare annotation was computed. [2021-08-26 08:46:03,095 INFO L853 garLoopResultBuilder]: At program point L27(line 27) the Hoare annotation is: (and (= gcd_~y2 |gcd_#in~y2|) (<= 1 gcd_~y1) (<= (+ gcd_~y1 1) gcd_~y2) (= gcd_~y1 |gcd_#in~y1|)) [2021-08-26 08:46:03,095 INFO L857 garLoopResultBuilder]: For program point gcdEXIT(lines 17 28) no Hoare annotation was computed. [2021-08-26 08:46:03,095 INFO L857 garLoopResultBuilder]: For program point L27-1(line 27) no Hoare annotation was computed. [2021-08-26 08:46:03,096 INFO L853 garLoopResultBuilder]: At program point L25(line 25) the Hoare annotation is: (and (<= 1 gcd_~y2) (= gcd_~y2 |gcd_#in~y2|) (= gcd_~y1 |gcd_#in~y1|) (<= (+ gcd_~y2 1) gcd_~y1)) [2021-08-26 08:46:03,096 INFO L857 garLoopResultBuilder]: For program point L24(lines 24 26) no Hoare annotation was computed. [2021-08-26 08:46:03,096 INFO L857 garLoopResultBuilder]: For program point L25-1(line 25) no Hoare annotation was computed. [2021-08-26 08:46:03,096 INFO L860 garLoopResultBuilder]: At program point gcdENTRY(lines 17 28) the Hoare annotation is: true [2021-08-26 08:46:03,096 INFO L857 garLoopResultBuilder]: For program point L21(lines 21 23) no Hoare annotation was computed. [2021-08-26 08:46:03,096 INFO L857 garLoopResultBuilder]: For program point L18(lines 18 20) no Hoare annotation was computed. [2021-08-26 08:46:03,096 INFO L857 garLoopResultBuilder]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2021-08-26 08:46:03,097 INFO L857 garLoopResultBuilder]: For program point L32(lines 32 34) no Hoare annotation was computed. [2021-08-26 08:46:03,097 INFO L857 garLoopResultBuilder]: For program point L-1(line -1) no Hoare annotation was computed. [2021-08-26 08:46:03,097 INFO L857 garLoopResultBuilder]: For program point ULTIMATE.startENTRY(line -1) no Hoare annotation was computed. [2021-08-26 08:46:03,097 INFO L857 garLoopResultBuilder]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2021-08-26 08:46:03,097 INFO L857 garLoopResultBuilder]: For program point ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION(line 41) no Hoare annotation was computed. [2021-08-26 08:46:03,097 INFO L860 garLoopResultBuilder]: At program point L43(lines 30 45) the Hoare annotation is: true [2021-08-26 08:46:03,097 INFO L857 garLoopResultBuilder]: For program point L41(line 41) no Hoare annotation was computed. [2021-08-26 08:46:03,100 INFO L857 garLoopResultBuilder]: For program point L40(lines 40 44) no Hoare annotation was computed. [2021-08-26 08:46:03,100 INFO L853 garLoopResultBuilder]: At program point L39(line 39) the Hoare annotation is: (and (<= 1 ULTIMATE.start_main_~m~0) (<= 1 ULTIMATE.start_main_~n~0)) [2021-08-26 08:46:03,101 INFO L857 garLoopResultBuilder]: For program point L39-1(line 39) no Hoare annotation was computed. [2021-08-26 08:46:03,101 INFO L857 garLoopResultBuilder]: For program point L36(lines 36 38) no Hoare annotation was computed. [2021-08-26 08:46:03,104 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2021-08-26 08:46:03,109 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 26.08 08:46:03 BoogieIcfgContainer [2021-08-26 08:46:03,111 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-08-26 08:46:03,111 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-08-26 08:46:03,111 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-08-26 08:46:03,111 INFO L275 PluginConnector]: Witness Printer initialized [2021-08-26 08:46:03,112 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.08 08:46:01" (3/4) ... [2021-08-26 08:46:03,114 INFO L137 WitnessPrinter]: Generating witness for correct program [2021-08-26 08:46:03,118 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure gcd [2021-08-26 08:46:03,122 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 9 nodes and edges [2021-08-26 08:46:03,122 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 5 nodes and edges [2021-08-26 08:46:03,123 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2021-08-26 08:46:03,123 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2021-08-26 08:46:03,149 INFO L141 WitnessManager]: Wrote witness to /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/witness.graphml [2021-08-26 08:46:03,150 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-08-26 08:46:03,151 INFO L168 Benchmark]: Toolchain (without parser) took 2450.55 ms. Allocated memory was 71.3 MB in the beginning and 90.2 MB in the end (delta: 18.9 MB). Free memory was 53.4 MB in the beginning and 68.1 MB in the end (delta: -14.7 MB). Peak memory consumption was 2.6 MB. Max. memory is 16.1 GB. [2021-08-26 08:46:03,151 INFO L168 Benchmark]: CDTParser took 0.15 ms. Allocated memory is still 71.3 MB. Free memory is still 51.9 MB. There was no memory consumed. Max. memory is 16.1 GB. [2021-08-26 08:46:03,151 INFO L168 Benchmark]: CACSL2BoogieTranslator took 175.92 ms. Allocated memory is still 71.3 MB. Free memory was 53.2 MB in the beginning and 54.3 MB in the end (delta: -1.1 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. [2021-08-26 08:46:03,151 INFO L168 Benchmark]: Boogie Procedure Inliner took 24.02 ms. Allocated memory is still 71.3 MB. Free memory was 54.3 MB in the beginning and 53.0 MB in the end (delta: 1.2 MB). There was no memory consumed. Max. memory is 16.1 GB. [2021-08-26 08:46:03,152 INFO L168 Benchmark]: Boogie Preprocessor took 28.17 ms. Allocated memory is still 71.3 MB. Free memory was 52.8 MB in the beginning and 51.9 MB in the end (delta: 859.1 kB). There was no memory consumed. Max. memory is 16.1 GB. [2021-08-26 08:46:03,152 INFO L168 Benchmark]: RCFGBuilder took 283.83 ms. Allocated memory is still 71.3 MB. Free memory was 51.9 MB in the beginning and 38.7 MB in the end (delta: 13.2 MB). Peak memory consumption was 12.6 MB. Max. memory is 16.1 GB. [2021-08-26 08:46:03,152 INFO L168 Benchmark]: TraceAbstraction took 1894.41 ms. Allocated memory was 71.3 MB in the beginning and 90.2 MB in the end (delta: 18.9 MB). Free memory was 38.4 MB in the beginning and 71.0 MB in the end (delta: -32.6 MB). Peak memory consumption was 31.2 MB. Max. memory is 16.1 GB. [2021-08-26 08:46:03,152 INFO L168 Benchmark]: Witness Printer took 38.55 ms. Allocated memory is still 90.2 MB. Free memory was 71.0 MB in the beginning and 68.1 MB in the end (delta: 3.0 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-08-26 08:46:03,153 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.15 ms. Allocated memory is still 71.3 MB. Free memory is still 51.9 MB. There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 175.92 ms. Allocated memory is still 71.3 MB. Free memory was 53.2 MB in the beginning and 54.3 MB in the end (delta: -1.1 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 24.02 ms. Allocated memory is still 71.3 MB. Free memory was 54.3 MB in the beginning and 53.0 MB in the end (delta: 1.2 MB). There was no memory consumed. Max. memory is 16.1 GB. * Boogie Preprocessor took 28.17 ms. Allocated memory is still 71.3 MB. Free memory was 52.8 MB in the beginning and 51.9 MB in the end (delta: 859.1 kB). There was no memory consumed. Max. memory is 16.1 GB. * RCFGBuilder took 283.83 ms. Allocated memory is still 71.3 MB. Free memory was 51.9 MB in the beginning and 38.7 MB in the end (delta: 13.2 MB). Peak memory consumption was 12.6 MB. Max. memory is 16.1 GB. * TraceAbstraction took 1894.41 ms. Allocated memory was 71.3 MB in the beginning and 90.2 MB in the end (delta: 18.9 MB). Free memory was 38.4 MB in the beginning and 71.0 MB in the end (delta: -32.6 MB). Peak memory consumption was 31.2 MB. Max. memory is 16.1 GB. * Witness Printer took 38.55 ms. Allocated memory is still 90.2 MB. Free memory was 71.0 MB in the beginning and 68.1 MB in the end (delta: 3.0 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0ms ErrorAutomatonConstructionTimeTotal, 0.0ms FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0ms ErrorAutomatonConstructionTimeAvg, 0.0ms ErrorAutomatonDifferenceTimeAvg, 0.0ms ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - PositiveResult [Line: 41]: call to reach_error is unreachable For all program executions holds that call to reach_error is unreachable at this location - StatisticsResult: Ultimate Automizer benchmark data CFG has 2 procedures, 22 locations, 1 error locations. Started 1 CEGAR loops. OverallTime: 1840.1ms, OverallIterations: 7, TraceHistogramMax: 3, EmptinessCheckTime: 11.1ms, AutomataDifference: 639.1ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 68.5ms, InitialAbstractionConstructionTime: 11.2ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 121 SDtfs, 94 SDslu, 382 SDs, 0 SdLazy, 273 SolverSat, 19 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 256.9ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 93 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 434.3ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=27occurred in iteration=6, InterpolantAutomatonStates: 47, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 51.5ms AutomataMinimizationTime, 7 MinimizatonAttempts, 8 StatesRemovedByMinimization, 4 NontrivialMinimizations, HoareAnnotationStatistics: 0.0ms HoareAnnotationTime, 5 LocationsWithAnnotation, 11 PreInvPairs, 14 NumberOfFragments, 39 HoareAnnotationTreeSize, 11 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 15.3ms HoareSimplificationTime, 5 FomulaSimplificationsInter, 10 FormulaSimplificationTreeSizeReductionInter, 48.4ms HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 22.8ms SsaConstructionTime, 101.9ms SatisfiabilityAnalysisTime, 773.5ms InterpolantComputationTime, 136 NumberOfCodeBlocks, 136 NumberOfCodeBlocksAsserted, 7 NumberOfCheckSat, 129 ConstructedInterpolants, 0 QuantifiedInterpolants, 290 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 7 InterpolantComputations, 7 PerfectInterpolantSequences, 34/34 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 - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 30]: Loop Invariant Derived loop invariant: 1 RESULT: Ultimate proved your program to be correct! [2021-08-26 08:46:03,184 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request...