./Ultimate.py --spec ../sv-benchmarks/c/properties/termination.prp --file ../sv-benchmarks/c/termination-crafted-lit/Urban-WST2013-Fig2.c --full-output --architecture 64bit -------------------------------------------------------------------------------- Checking for termination Using default analysis Version 3a877d22 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/AutomizerTermination.xml -i ../sv-benchmarks/c/termination-crafted-lit/Urban-WST2013-Fig2.c -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Termination-64bit-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(F end) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 64bit --witnessprinter.graph.data.programhash 9c55a9a6f50b70c8ad02d8f9cdba1133727e3a9a73c5b8d3940178ed4735e2c1 --- Real Ultimate output --- This is Ultimate 0.2.2-3a877d227dc491413fd706022d0c47cd97beb353-3a877d2 [2021-12-15 16:58:29,729 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-12-15 16:58:29,733 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-12-15 16:58:29,761 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-12-15 16:58:29,762 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-12-15 16:58:29,763 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-12-15 16:58:29,763 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-12-15 16:58:29,772 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-12-15 16:58:29,773 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-12-15 16:58:29,784 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-12-15 16:58:29,784 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-12-15 16:58:29,786 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-12-15 16:58:29,791 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-12-15 16:58:29,792 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-12-15 16:58:29,793 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-12-15 16:58:29,794 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-12-15 16:58:29,799 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-12-15 16:58:29,800 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-12-15 16:58:29,801 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-12-15 16:58:29,802 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-12-15 16:58:29,807 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-12-15 16:58:29,808 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-12-15 16:58:29,809 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-12-15 16:58:29,810 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-12-15 16:58:29,811 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-12-15 16:58:29,816 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-12-15 16:58:29,816 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-12-15 16:58:29,817 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-12-15 16:58:29,817 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-12-15 16:58:29,818 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-12-15 16:58:29,819 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-12-15 16:58:29,820 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-12-15 16:58:29,821 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-12-15 16:58:29,822 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-12-15 16:58:29,823 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-12-15 16:58:29,823 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-12-15 16:58:29,824 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-12-15 16:58:29,825 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-12-15 16:58:29,825 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-12-15 16:58:29,826 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-12-15 16:58:29,827 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-12-15 16:58:29,828 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Termination-64bit-Automizer_Default.epf [2021-12-15 16:58:29,860 INFO L113 SettingsManager]: Loading preferences was successful [2021-12-15 16:58:29,862 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-12-15 16:58:29,862 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-12-15 16:58:29,862 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-12-15 16:58:29,863 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-12-15 16:58:29,863 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-12-15 16:58:29,864 INFO L138 SettingsManager]: * Use SBE=true [2021-12-15 16:58:29,864 INFO L136 SettingsManager]: Preferences of BuchiAutomizer differ from their defaults: [2021-12-15 16:58:29,864 INFO L138 SettingsManager]: * NCSB implementation=INTSET_LAZY3 [2021-12-15 16:58:29,864 INFO L138 SettingsManager]: * Use old map elimination=false [2021-12-15 16:58:29,865 INFO L138 SettingsManager]: * Use external solver (rank synthesis)=false [2021-12-15 16:58:29,865 INFO L138 SettingsManager]: * Use only trivial implications for array writes=true [2021-12-15 16:58:29,865 INFO L138 SettingsManager]: * Rank analysis=LINEAR_WITH_GUESSES [2021-12-15 16:58:29,865 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-12-15 16:58:29,865 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-12-15 16:58:29,865 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-12-15 16:58:29,866 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-12-15 16:58:29,866 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=ASSUME [2021-12-15 16:58:29,866 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=ASSUME [2021-12-15 16:58:29,866 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=ASSUME [2021-12-15 16:58:29,866 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-12-15 16:58:29,866 INFO L138 SettingsManager]: * Assume nondeterminstic values are in range=false [2021-12-15 16:58:29,867 INFO L138 SettingsManager]: * Use constant arrays=true [2021-12-15 16:58:29,867 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=ASSUME [2021-12-15 16:58:29,867 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-12-15 16:58:29,867 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-12-15 16:58:29,867 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-12-15 16:58:29,867 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-12-15 16:58:29,868 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-12-15 16:58:29,868 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2021-12-15 16:58:29,868 INFO L138 SettingsManager]: * TransformationType=MODULO_NEIGHBOR 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(F end) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 64bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 9c55a9a6f50b70c8ad02d8f9cdba1133727e3a9a73c5b8d3940178ed4735e2c1 [2021-12-15 16:58:30,046 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-12-15 16:58:30,064 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-12-15 16:58:30,067 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-12-15 16:58:30,068 INFO L271 PluginConnector]: Initializing CDTParser... [2021-12-15 16:58:30,069 INFO L275 PluginConnector]: CDTParser initialized [2021-12-15 16:58:30,070 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/termination-crafted-lit/Urban-WST2013-Fig2.c [2021-12-15 16:58:30,140 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d94d92be2/338c92504a7740b0b8cba1ff27537fed/FLAGd620195df [2021-12-15 16:58:30,452 INFO L306 CDTParser]: Found 1 translation units. [2021-12-15 16:58:30,452 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/termination-crafted-lit/Urban-WST2013-Fig2.c [2021-12-15 16:58:30,457 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d94d92be2/338c92504a7740b0b8cba1ff27537fed/FLAGd620195df [2021-12-15 16:58:30,899 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d94d92be2/338c92504a7740b0b8cba1ff27537fed [2021-12-15 16:58:30,901 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-12-15 16:58:30,902 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-12-15 16:58:30,904 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-12-15 16:58:30,905 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-12-15 16:58:30,907 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-12-15 16:58:30,907 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.12 04:58:30" (1/1) ... [2021-12-15 16:58:30,908 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3702b588 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.12 04:58:30, skipping insertion in model container [2021-12-15 16:58:30,908 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.12 04:58:30" (1/1) ... [2021-12-15 16:58:30,914 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-12-15 16:58:30,926 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-12-15 16:58:31,032 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-15 16:58:31,043 INFO L203 MainTranslator]: Completed pre-run [2021-12-15 16:58:31,057 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-15 16:58:31,065 INFO L208 MainTranslator]: Completed translation [2021-12-15 16:58:31,066 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.12 04:58:31 WrapperNode [2021-12-15 16:58:31,066 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-12-15 16:58:31,067 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-12-15 16:58:31,067 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-12-15 16:58:31,067 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-12-15 16:58:31,073 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.12 04:58:31" (1/1) ... [2021-12-15 16:58:31,077 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.12 04:58:31" (1/1) ... [2021-12-15 16:58:31,089 INFO L137 Inliner]: procedures = 4, calls = 2, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 21 [2021-12-15 16:58:31,089 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-12-15 16:58:31,090 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-12-15 16:58:31,090 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-12-15 16:58:31,090 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-12-15 16:58:31,095 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.12 04:58:31" (1/1) ... [2021-12-15 16:58:31,096 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.12 04:58:31" (1/1) ... [2021-12-15 16:58:31,096 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.12 04:58:31" (1/1) ... [2021-12-15 16:58:31,097 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.12 04:58:31" (1/1) ... [2021-12-15 16:58:31,098 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.12 04:58:31" (1/1) ... [2021-12-15 16:58:31,102 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.12 04:58:31" (1/1) ... [2021-12-15 16:58:31,102 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.12 04:58:31" (1/1) ... [2021-12-15 16:58:31,103 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-12-15 16:58:31,104 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-12-15 16:58:31,104 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-12-15 16:58:31,104 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-12-15 16:58:31,105 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.12 04:58:31" (1/1) ... [2021-12-15 16:58:31,110 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2021-12-15 16:58:31,119 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-15 16:58:31,132 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2021-12-15 16:58:31,152 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (1)] Waiting until timeout for monitored process [2021-12-15 16:58:31,166 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-12-15 16:58:31,166 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-12-15 16:58:31,208 INFO L236 CfgBuilder]: Building ICFG [2021-12-15 16:58:31,210 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-12-15 16:58:31,274 INFO L277 CfgBuilder]: Performing block encoding [2021-12-15 16:58:31,279 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-12-15 16:58:31,279 INFO L301 CfgBuilder]: Removed 2 assume(true) statements. [2021-12-15 16:58:31,280 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.12 04:58:31 BoogieIcfgContainer [2021-12-15 16:58:31,280 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-12-15 16:58:31,281 INFO L113 PluginConnector]: ------------------------BuchiAutomizer---------------------------- [2021-12-15 16:58:31,281 INFO L271 PluginConnector]: Initializing BuchiAutomizer... [2021-12-15 16:58:31,283 INFO L275 PluginConnector]: BuchiAutomizer initialized [2021-12-15 16:58:31,284 INFO L99 BuchiAutomizer]: Safety of program was proven or not checked, starting termination analysis [2021-12-15 16:58:31,284 INFO L185 PluginConnector]: Executing the observer BuchiAutomizerObserver from plugin BuchiAutomizer for "CDTParser AST 15.12 04:58:30" (1/3) ... [2021-12-15 16:58:31,284 INFO L205 PluginConnector]: Invalid model from BuchiAutomizer for observer de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer.BuchiAutomizerObserver@7b07242 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer AST 15.12 04:58:31, skipping insertion in model container [2021-12-15 16:58:31,285 INFO L99 BuchiAutomizer]: Safety of program was proven or not checked, starting termination analysis [2021-12-15 16:58:31,285 INFO L185 PluginConnector]: Executing the observer BuchiAutomizerObserver from plugin BuchiAutomizer for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.12 04:58:31" (2/3) ... [2021-12-15 16:58:31,285 INFO L205 PluginConnector]: Invalid model from BuchiAutomizer for observer de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer.BuchiAutomizerObserver@7b07242 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer AST 15.12 04:58:31, skipping insertion in model container [2021-12-15 16:58:31,285 INFO L99 BuchiAutomizer]: Safety of program was proven or not checked, starting termination analysis [2021-12-15 16:58:31,285 INFO L185 PluginConnector]: Executing the observer BuchiAutomizerObserver from plugin BuchiAutomizer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.12 04:58:31" (3/3) ... [2021-12-15 16:58:31,286 INFO L388 chiAutomizerObserver]: Analyzing ICFG Urban-WST2013-Fig2.c [2021-12-15 16:58:31,327 INFO L359 BuchiCegarLoop]: Interprodecural is true [2021-12-15 16:58:31,327 INFO L360 BuchiCegarLoop]: Hoare is false [2021-12-15 16:58:31,328 INFO L361 BuchiCegarLoop]: Compute interpolants for ForwardPredicates [2021-12-15 16:58:31,328 INFO L362 BuchiCegarLoop]: Backedges is STRAIGHT_LINE [2021-12-15 16:58:31,328 INFO L363 BuchiCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-12-15 16:58:31,328 INFO L364 BuchiCegarLoop]: Difference is false [2021-12-15 16:58:31,328 INFO L365 BuchiCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-12-15 16:58:31,328 INFO L368 BuchiCegarLoop]: ======== Iteration 0==of CEGAR loop == BuchiCegarLoop======== [2021-12-15 16:58:31,337 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand has 9 states, 8 states have (on average 1.5) internal successors, (12), 8 states have internal predecessors, (12), 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) [2021-12-15 16:58:31,350 INFO L131 ngComponentsAnalysis]: Automaton has 1 accepting balls. 3 [2021-12-15 16:58:31,350 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2021-12-15 16:58:31,350 INFO L119 BuchiIsEmpty]: Starting construction of run [2021-12-15 16:58:31,354 INFO L842 BuchiCegarLoop]: Counterexample stem histogram [1, 1] [2021-12-15 16:58:31,354 INFO L843 BuchiCegarLoop]: Counterexample loop histogram [1, 1, 1] [2021-12-15 16:58:31,354 INFO L425 BuchiCegarLoop]: ======== Iteration 1============ [2021-12-15 16:58:31,354 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand has 9 states, 8 states have (on average 1.5) internal successors, (12), 8 states have internal predecessors, (12), 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) [2021-12-15 16:58:31,356 INFO L131 ngComponentsAnalysis]: Automaton has 1 accepting balls. 3 [2021-12-15 16:58:31,356 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2021-12-15 16:58:31,356 INFO L119 BuchiIsEmpty]: Starting construction of run [2021-12-15 16:58:31,356 INFO L842 BuchiCegarLoop]: Counterexample stem histogram [1, 1] [2021-12-15 16:58:31,356 INFO L843 BuchiCegarLoop]: Counterexample loop histogram [1, 1, 1] [2021-12-15 16:58:31,361 INFO L791 eck$LassoCheckResult]: Stem: 6#ULTIMATE.startENTRYtrue assume { :begin_inline_ULTIMATE.init } true; 9#L-1true assume { :end_inline_ULTIMATE.init } true;assume { :begin_inline_main } true;havoc main_#res#1;havoc main_#t~nondet0#1, main_#t~nondet1#1, main_~x1~0#1, main_~x2~0#1;havoc main_~x1~0#1;havoc main_~x2~0#1;main_~x1~0#1 := main_#t~nondet0#1;havoc main_#t~nondet0#1;main_~x2~0#1 := main_#t~nondet1#1;havoc main_#t~nondet1#1; 3#L19-2true [2021-12-15 16:58:31,362 INFO L793 eck$LassoCheckResult]: Loop: 3#L19-2true assume !!(main_~x1~0#1 <= 10);main_~x2~0#1 := 10; 7#L21-2true assume !(main_~x2~0#1 > 1); 5#L21-3true main_~x1~0#1 := 1 + main_~x1~0#1; 3#L19-2true [2021-12-15 16:58:31,367 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-15 16:58:31,367 INFO L85 PathProgramCache]: Analyzing trace with hash 963, now seen corresponding path program 1 times [2021-12-15 16:58:31,373 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-15 16:58:31,373 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [688017951] [2021-12-15 16:58:31,373 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-15 16:58:31,374 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-15 16:58:31,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-12-15 16:58:31,426 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-12-15 16:58:31,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-12-15 16:58:31,452 INFO L133 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-12-15 16:58:31,459 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-15 16:58:31,460 INFO L85 PathProgramCache]: Analyzing trace with hash 40944, now seen corresponding path program 1 times [2021-12-15 16:58:31,460 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-15 16:58:31,460 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [431915025] [2021-12-15 16:58:31,460 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-15 16:58:31,461 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-15 16:58:31,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-15 16:58:31,526 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-15 16:58:31,527 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-15 16:58:31,527 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [431915025] [2021-12-15 16:58:31,528 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [431915025] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-15 16:58:31,528 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-15 16:58:31,528 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-15 16:58:31,528 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1460610252] [2021-12-15 16:58:31,529 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-15 16:58:31,532 INFO L808 eck$LassoCheckResult]: loop already infeasible [2021-12-15 16:58:31,532 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-15 16:58:31,603 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-15 16:58:31,605 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-15 16:58:31,607 INFO L87 Difference]: Start difference. First operand has 9 states, 8 states have (on average 1.5) internal successors, (12), 8 states have internal predecessors, (12), 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) Second operand has 3 states, 3 states have (on average 1.0) internal successors, (3), 2 states have internal predecessors, (3), 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) [2021-12-15 16:58:31,637 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-15 16:58:31,637 INFO L93 Difference]: Finished difference Result 10 states and 11 transitions. [2021-12-15 16:58:31,639 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-15 16:58:31,644 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 10 states and 11 transitions. [2021-12-15 16:58:31,646 INFO L131 ngComponentsAnalysis]: Automaton has 1 accepting balls. 4 [2021-12-15 16:58:31,649 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 10 states to 6 states and 7 transitions. [2021-12-15 16:58:31,656 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 6 [2021-12-15 16:58:31,656 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 6 [2021-12-15 16:58:31,656 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 7 transitions. [2021-12-15 16:58:31,657 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-12-15 16:58:31,657 INFO L681 BuchiCegarLoop]: Abstraction has 6 states and 7 transitions. [2021-12-15 16:58:31,672 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6 states and 7 transitions. [2021-12-15 16:58:31,691 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6 to 6. [2021-12-15 16:58:31,692 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 5 states have internal predecessors, (7), 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) [2021-12-15 16:58:31,693 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 7 transitions. [2021-12-15 16:58:31,697 INFO L704 BuchiCegarLoop]: Abstraction has 6 states and 7 transitions. [2021-12-15 16:58:31,698 INFO L587 BuchiCegarLoop]: Abstraction has 6 states and 7 transitions. [2021-12-15 16:58:31,698 INFO L425 BuchiCegarLoop]: ======== Iteration 2============ [2021-12-15 16:58:31,698 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 6 states and 7 transitions. [2021-12-15 16:58:31,698 INFO L131 ngComponentsAnalysis]: Automaton has 1 accepting balls. 4 [2021-12-15 16:58:31,699 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2021-12-15 16:58:31,699 INFO L119 BuchiIsEmpty]: Starting construction of run [2021-12-15 16:58:31,699 INFO L842 BuchiCegarLoop]: Counterexample stem histogram [1, 1] [2021-12-15 16:58:31,699 INFO L843 BuchiCegarLoop]: Counterexample loop histogram [1, 1, 1, 1] [2021-12-15 16:58:31,699 INFO L791 eck$LassoCheckResult]: Stem: 31#ULTIMATE.startENTRY assume { :begin_inline_ULTIMATE.init } true; 32#L-1 assume { :end_inline_ULTIMATE.init } true;assume { :begin_inline_main } true;havoc main_#res#1;havoc main_#t~nondet0#1, main_#t~nondet1#1, main_~x1~0#1, main_~x2~0#1;havoc main_~x1~0#1;havoc main_~x2~0#1;main_~x1~0#1 := main_#t~nondet0#1;havoc main_#t~nondet0#1;main_~x2~0#1 := main_#t~nondet1#1;havoc main_#t~nondet1#1; 28#L19-2 [2021-12-15 16:58:31,699 INFO L793 eck$LassoCheckResult]: Loop: 28#L19-2 assume !!(main_~x1~0#1 <= 10);main_~x2~0#1 := 10; 29#L21-2 assume !!(main_~x2~0#1 > 1);main_~x2~0#1 := main_~x2~0#1 - 1; 33#L21-2 assume !(main_~x2~0#1 > 1); 30#L21-3 main_~x1~0#1 := 1 + main_~x1~0#1; 28#L19-2 [2021-12-15 16:58:31,700 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-15 16:58:31,700 INFO L85 PathProgramCache]: Analyzing trace with hash 963, now seen corresponding path program 2 times [2021-12-15 16:58:31,700 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-15 16:58:31,701 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1304403580] [2021-12-15 16:58:31,701 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-15 16:58:31,701 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-15 16:58:31,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-12-15 16:58:31,711 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-12-15 16:58:31,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-12-15 16:58:31,713 INFO L133 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-12-15 16:58:31,713 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-15 16:58:31,714 INFO L85 PathProgramCache]: Analyzing trace with hash 1271024, now seen corresponding path program 1 times [2021-12-15 16:58:31,714 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-15 16:58:31,714 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [638994375] [2021-12-15 16:58:31,714 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-15 16:58:31,715 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-15 16:58:31,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-15 16:58:31,742 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-15 16:58:31,743 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-15 16:58:31,744 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [638994375] [2021-12-15 16:58:31,744 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [638994375] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-15 16:58:31,744 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [571906887] [2021-12-15 16:58:31,744 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-15 16:58:31,745 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-15 16:58:31,745 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-15 16:58:31,747 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-15 16:58:31,748 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-12-15 16:58:31,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-15 16:58:31,773 INFO L263 TraceCheckSpWp]: Trace formula consists of 11 conjuncts, 3 conjunts are in the unsatisfiable core [2021-12-15 16:58:31,774 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-15 16:58:31,806 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-15 16:58:31,806 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-15 16:58:31,828 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-15 16:58:31,829 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [571906887] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-15 16:58:31,829 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-15 16:58:31,829 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 5 [2021-12-15 16:58:31,829 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1579999962] [2021-12-15 16:58:31,829 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-15 16:58:31,830 INFO L808 eck$LassoCheckResult]: loop already infeasible [2021-12-15 16:58:31,830 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-15 16:58:31,830 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-12-15 16:58:31,831 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-12-15 16:58:31,831 INFO L87 Difference]: Start difference. First operand 6 states and 7 transitions. cyclomatic complexity: 2 Second operand has 6 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 5 states have internal predecessors, (7), 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) [2021-12-15 16:58:31,844 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-15 16:58:31,844 INFO L93 Difference]: Finished difference Result 9 states and 10 transitions. [2021-12-15 16:58:31,845 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-15 16:58:31,845 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 9 states and 10 transitions. [2021-12-15 16:58:31,846 INFO L131 ngComponentsAnalysis]: Automaton has 1 accepting balls. 7 [2021-12-15 16:58:31,846 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 9 states to 9 states and 10 transitions. [2021-12-15 16:58:31,847 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 9 [2021-12-15 16:58:31,847 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 9 [2021-12-15 16:58:31,847 INFO L73 IsDeterministic]: Start isDeterministic. Operand 9 states and 10 transitions. [2021-12-15 16:58:31,847 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-12-15 16:58:31,847 INFO L681 BuchiCegarLoop]: Abstraction has 9 states and 10 transitions. [2021-12-15 16:58:31,848 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states and 10 transitions. [2021-12-15 16:58:31,848 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2021-12-15 16:58:31,849 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9 states, 9 states have (on average 1.1111111111111112) internal successors, (10), 8 states have internal predecessors, (10), 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) [2021-12-15 16:58:31,849 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 10 transitions. [2021-12-15 16:58:31,849 INFO L704 BuchiCegarLoop]: Abstraction has 9 states and 10 transitions. [2021-12-15 16:58:31,849 INFO L587 BuchiCegarLoop]: Abstraction has 9 states and 10 transitions. [2021-12-15 16:58:31,849 INFO L425 BuchiCegarLoop]: ======== Iteration 3============ [2021-12-15 16:58:31,850 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 9 states and 10 transitions. [2021-12-15 16:58:31,850 INFO L131 ngComponentsAnalysis]: Automaton has 1 accepting balls. 7 [2021-12-15 16:58:31,850 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2021-12-15 16:58:31,850 INFO L119 BuchiIsEmpty]: Starting construction of run [2021-12-15 16:58:31,851 INFO L842 BuchiCegarLoop]: Counterexample stem histogram [1, 1] [2021-12-15 16:58:31,851 INFO L843 BuchiCegarLoop]: Counterexample loop histogram [4, 1, 1, 1] [2021-12-15 16:58:31,851 INFO L791 eck$LassoCheckResult]: Stem: 73#ULTIMATE.startENTRY assume { :begin_inline_ULTIMATE.init } true; 74#L-1 assume { :end_inline_ULTIMATE.init } true;assume { :begin_inline_main } true;havoc main_#res#1;havoc main_#t~nondet0#1, main_#t~nondet1#1, main_~x1~0#1, main_~x2~0#1;havoc main_~x1~0#1;havoc main_~x2~0#1;main_~x1~0#1 := main_#t~nondet0#1;havoc main_#t~nondet0#1;main_~x2~0#1 := main_#t~nondet1#1;havoc main_#t~nondet1#1; 70#L19-2 [2021-12-15 16:58:31,851 INFO L793 eck$LassoCheckResult]: Loop: 70#L19-2 assume !!(main_~x1~0#1 <= 10);main_~x2~0#1 := 10; 71#L21-2 assume !!(main_~x2~0#1 > 1);main_~x2~0#1 := main_~x2~0#1 - 1; 75#L21-2 assume !!(main_~x2~0#1 > 1);main_~x2~0#1 := main_~x2~0#1 - 1; 78#L21-2 assume !!(main_~x2~0#1 > 1);main_~x2~0#1 := main_~x2~0#1 - 1; 77#L21-2 assume !!(main_~x2~0#1 > 1);main_~x2~0#1 := main_~x2~0#1 - 1; 76#L21-2 assume !(main_~x2~0#1 > 1); 72#L21-3 main_~x1~0#1 := 1 + main_~x1~0#1; 70#L19-2 [2021-12-15 16:58:31,852 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-15 16:58:31,852 INFO L85 PathProgramCache]: Analyzing trace with hash 963, now seen corresponding path program 3 times [2021-12-15 16:58:31,852 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-15 16:58:31,852 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [995215822] [2021-12-15 16:58:31,853 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-15 16:58:31,853 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-15 16:58:31,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-12-15 16:58:31,856 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-12-15 16:58:31,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-12-15 16:58:31,858 INFO L133 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-12-15 16:58:31,858 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-15 16:58:31,859 INFO L85 PathProgramCache]: Analyzing trace with hash -787882000, now seen corresponding path program 2 times [2021-12-15 16:58:31,859 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-15 16:58:31,859 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1170637415] [2021-12-15 16:58:31,859 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-15 16:58:31,859 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-15 16:58:31,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-15 16:58:31,904 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-15 16:58:31,905 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-15 16:58:31,905 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1170637415] [2021-12-15 16:58:31,905 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1170637415] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-15 16:58:31,905 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1814279659] [2021-12-15 16:58:31,905 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-15 16:58:31,906 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-15 16:58:31,906 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-15 16:58:31,912 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-15 16:58:31,937 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-15 16:58:31,938 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-15 16:58:31,938 INFO L263 TraceCheckSpWp]: Trace formula consists of 20 conjuncts, 6 conjunts are in the unsatisfiable core [2021-12-15 16:58:31,939 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-15 16:58:31,944 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-12-15 16:58:31,971 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-15 16:58:31,972 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-15 16:58:32,033 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-15 16:58:32,034 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1814279659] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-15 16:58:32,034 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-15 16:58:32,034 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 10 [2021-12-15 16:58:32,034 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [948928971] [2021-12-15 16:58:32,034 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-15 16:58:32,035 INFO L808 eck$LassoCheckResult]: loop already infeasible [2021-12-15 16:58:32,035 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-15 16:58:32,035 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-12-15 16:58:32,036 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2021-12-15 16:58:32,036 INFO L87 Difference]: Start difference. First operand 9 states and 10 transitions. cyclomatic complexity: 2 Second operand has 11 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 10 states have internal predecessors, (13), 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) [2021-12-15 16:58:32,047 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-15 16:58:32,047 INFO L93 Difference]: Finished difference Result 14 states and 15 transitions. [2021-12-15 16:58:32,048 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-12-15 16:58:32,051 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 14 states and 15 transitions. [2021-12-15 16:58:32,052 INFO L131 ngComponentsAnalysis]: Automaton has 1 accepting balls. 12 [2021-12-15 16:58:32,054 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 14 states to 14 states and 15 transitions. [2021-12-15 16:58:32,055 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 14 [2021-12-15 16:58:32,055 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 14 [2021-12-15 16:58:32,055 INFO L73 IsDeterministic]: Start isDeterministic. Operand 14 states and 15 transitions. [2021-12-15 16:58:32,055 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-12-15 16:58:32,056 INFO L681 BuchiCegarLoop]: Abstraction has 14 states and 15 transitions. [2021-12-15 16:58:32,056 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states and 15 transitions. [2021-12-15 16:58:32,057 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2021-12-15 16:58:32,057 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 14 states have (on average 1.0714285714285714) internal successors, (15), 13 states have internal predecessors, (15), 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) [2021-12-15 16:58:32,058 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2021-12-15 16:58:32,058 INFO L704 BuchiCegarLoop]: Abstraction has 14 states and 15 transitions. [2021-12-15 16:58:32,058 INFO L587 BuchiCegarLoop]: Abstraction has 14 states and 15 transitions. [2021-12-15 16:58:32,059 INFO L425 BuchiCegarLoop]: ======== Iteration 4============ [2021-12-15 16:58:32,059 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 14 states and 15 transitions. [2021-12-15 16:58:32,059 INFO L131 ngComponentsAnalysis]: Automaton has 1 accepting balls. 12 [2021-12-15 16:58:32,060 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2021-12-15 16:58:32,060 INFO L119 BuchiIsEmpty]: Starting construction of run [2021-12-15 16:58:32,060 INFO L842 BuchiCegarLoop]: Counterexample stem histogram [1, 1] [2021-12-15 16:58:32,061 INFO L843 BuchiCegarLoop]: Counterexample loop histogram [9, 1, 1, 1] [2021-12-15 16:58:32,061 INFO L791 eck$LassoCheckResult]: Stem: 146#ULTIMATE.startENTRY assume { :begin_inline_ULTIMATE.init } true; 147#L-1 assume { :end_inline_ULTIMATE.init } true;assume { :begin_inline_main } true;havoc main_#res#1;havoc main_#t~nondet0#1, main_#t~nondet1#1, main_~x1~0#1, main_~x2~0#1;havoc main_~x1~0#1;havoc main_~x2~0#1;main_~x1~0#1 := main_#t~nondet0#1;havoc main_#t~nondet0#1;main_~x2~0#1 := main_#t~nondet1#1;havoc main_#t~nondet1#1; 143#L19-2 [2021-12-15 16:58:32,061 INFO L793 eck$LassoCheckResult]: Loop: 143#L19-2 assume !!(main_~x1~0#1 <= 10);main_~x2~0#1 := 10; 144#L21-2 assume !!(main_~x2~0#1 > 1);main_~x2~0#1 := main_~x2~0#1 - 1; 148#L21-2 assume !!(main_~x2~0#1 > 1);main_~x2~0#1 := main_~x2~0#1 - 1; 156#L21-2 assume !!(main_~x2~0#1 > 1);main_~x2~0#1 := main_~x2~0#1 - 1; 155#L21-2 assume !!(main_~x2~0#1 > 1);main_~x2~0#1 := main_~x2~0#1 - 1; 154#L21-2 assume !!(main_~x2~0#1 > 1);main_~x2~0#1 := main_~x2~0#1 - 1; 153#L21-2 assume !!(main_~x2~0#1 > 1);main_~x2~0#1 := main_~x2~0#1 - 1; 152#L21-2 assume !!(main_~x2~0#1 > 1);main_~x2~0#1 := main_~x2~0#1 - 1; 151#L21-2 assume !!(main_~x2~0#1 > 1);main_~x2~0#1 := main_~x2~0#1 - 1; 150#L21-2 assume !!(main_~x2~0#1 > 1);main_~x2~0#1 := main_~x2~0#1 - 1; 149#L21-2 assume !(main_~x2~0#1 > 1); 145#L21-3 main_~x1~0#1 := 1 + main_~x1~0#1; 143#L19-2 [2021-12-15 16:58:32,062 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-15 16:58:32,064 INFO L85 PathProgramCache]: Analyzing trace with hash 963, now seen corresponding path program 4 times [2021-12-15 16:58:32,064 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-15 16:58:32,064 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [477373201] [2021-12-15 16:58:32,064 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-15 16:58:32,065 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-15 16:58:32,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-12-15 16:58:32,069 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-12-15 16:58:32,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-12-15 16:58:32,072 INFO L133 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-12-15 16:58:32,073 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-15 16:58:32,075 INFO L85 PathProgramCache]: Analyzing trace with hash -219093776, now seen corresponding path program 3 times [2021-12-15 16:58:32,076 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-15 16:58:32,076 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [706601168] [2021-12-15 16:58:32,076 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-15 16:58:32,077 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-15 16:58:32,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-12-15 16:58:32,088 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-12-15 16:58:32,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-12-15 16:58:32,097 INFO L133 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-12-15 16:58:32,097 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-15 16:58:32,097 INFO L85 PathProgramCache]: Analyzing trace with hash 995055026, now seen corresponding path program 1 times [2021-12-15 16:58:32,098 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-15 16:58:32,098 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [103341397] [2021-12-15 16:58:32,098 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-15 16:58:32,098 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-15 16:58:32,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-12-15 16:58:32,106 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-12-15 16:58:32,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-12-15 16:58:32,121 INFO L133 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-12-15 16:58:32,209 FATAL L? ?]: The Plugin de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer has thrown an exception: java.lang.UnsupportedOperationException: Set is immutable at de.uni_freiburg.informatik.ultimate.util.datastructures.ImmutableSet.retainAll(ImmutableSet.java:338) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.UnmodifiableTransFormula.removeSuperfluousVars(UnmodifiableTransFormula.java:212) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaBuilder.finishConstruction(TransFormulaBuilder.java:273) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaBuilder.getTrivialTransFormula(TransFormulaBuilder.java:285) at de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer.LassoCheck.synthesize(LassoCheck.java:548) at de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer.LassoCheck$LassoCheckResult.checkLoopTermination(LassoCheck.java:944) at de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer.LassoCheck$LassoCheckResult.(LassoCheck.java:855) at de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer.LassoCheck.(LassoCheck.java:252) at de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer.BuchiCegarLoop.iterate(BuchiCegarLoop.java:457) at de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer.BuchiAutomizerObserver.doTerminationAnalysis(BuchiAutomizerObserver.java:142) at de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer.BuchiAutomizerObserver.finish(BuchiAutomizerObserver.java:397) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-12-15 16:58:32,211 INFO L158 Benchmark]: Toolchain (without parser) took 1308.70ms. Allocated memory was 90.2MB in the beginning and 109.1MB in the end (delta: 18.9MB). Free memory was 60.6MB in the beginning and 84.2MB in the end (delta: -23.6MB). Peak memory consumption was 27.2MB. Max. memory is 16.1GB. [2021-12-15 16:58:32,212 INFO L158 Benchmark]: CDTParser took 0.21ms. Allocated memory is still 90.2MB. Free memory was 46.6MB in the beginning and 46.5MB in the end (delta: 69.9kB). There was no memory consumed. Max. memory is 16.1GB. [2021-12-15 16:58:32,212 INFO L158 Benchmark]: CACSL2BoogieTranslator took 162.13ms. Allocated memory is still 90.2MB. Free memory was 60.4MB in the beginning and 68.4MB in the end (delta: -7.9MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. [2021-12-15 16:58:32,212 INFO L158 Benchmark]: Boogie Procedure Inliner took 22.04ms. Allocated memory is still 90.2MB. Free memory was 68.4MB in the beginning and 67.3MB in the end (delta: 1.1MB). There was no memory consumed. Max. memory is 16.1GB. [2021-12-15 16:58:32,212 INFO L158 Benchmark]: Boogie Preprocessor took 13.50ms. Allocated memory is still 90.2MB. Free memory was 67.3MB in the beginning and 66.3MB in the end (delta: 1.0MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-12-15 16:58:32,213 INFO L158 Benchmark]: RCFGBuilder took 176.31ms. Allocated memory is still 90.2MB. Free memory was 66.3MB in the beginning and 58.3MB in the end (delta: 8.0MB). Peak memory consumption was 6.3MB. Max. memory is 16.1GB. [2021-12-15 16:58:32,213 INFO L158 Benchmark]: BuchiAutomizer took 929.33ms. Allocated memory was 90.2MB in the beginning and 109.1MB in the end (delta: 18.9MB). Free memory was 58.3MB in the beginning and 84.2MB in the end (delta: -25.9MB). Peak memory consumption was 27.9MB. Max. memory is 16.1GB. [2021-12-15 16:58:32,215 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.21ms. Allocated memory is still 90.2MB. Free memory was 46.6MB in the beginning and 46.5MB in the end (delta: 69.9kB). There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 162.13ms. Allocated memory is still 90.2MB. Free memory was 60.4MB in the beginning and 68.4MB in the end (delta: -7.9MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 22.04ms. Allocated memory is still 90.2MB. Free memory was 68.4MB in the beginning and 67.3MB in the end (delta: 1.1MB). There was no memory consumed. Max. memory is 16.1GB. * Boogie Preprocessor took 13.50ms. Allocated memory is still 90.2MB. Free memory was 67.3MB in the beginning and 66.3MB in the end (delta: 1.0MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * RCFGBuilder took 176.31ms. Allocated memory is still 90.2MB. Free memory was 66.3MB in the beginning and 58.3MB in the end (delta: 8.0MB). Peak memory consumption was 6.3MB. Max. memory is 16.1GB. * BuchiAutomizer took 929.33ms. Allocated memory was 90.2MB in the beginning and 109.1MB in the end (delta: 18.9MB). Free memory was 58.3MB in the beginning and 84.2MB in the end (delta: -25.9MB). Peak memory consumption was 27.9MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer: - ExceptionOrErrorResult: UnsupportedOperationException: Set is immutable de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer: UnsupportedOperationException: Set is immutable: de.uni_freiburg.informatik.ultimate.util.datastructures.ImmutableSet.retainAll(ImmutableSet.java:338) RESULT: Ultimate could not prove your program: Toolchain returned no result. [2021-12-15 16:58:32,247 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-12-15 16:58:32,460 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-12-15 16:58:32,660 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (1)] Forceful destruction successful, exit code 0 Received shutdown request... --- End real Ultimate output --- Execution finished normally Using bit-precise analysis No suitable file found in config dir /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config using search string *Termination*64bit*_Bitvector*.epf No suitable settings file found using Termination*64bit*_Bitvector ERROR: UNSUPPORTED PROPERTY Writing output log to file Ultimate.log Result: ERROR: ExceptionOrErrorResult: UnsupportedOperationException: Set is immutable