./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/ldv-regression/test20.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version e943c265 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_826c9408-3f13-4516-a850-d6e4b8e324bc/bin/uautomizer-j4sWxH34Be/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_826c9408-3f13-4516-a850-d6e4b8e324bc/bin/uautomizer-j4sWxH34Be/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_826c9408-3f13-4516-a850-d6e4b8e324bc/bin/uautomizer-j4sWxH34Be/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_826c9408-3f13-4516-a850-d6e4b8e324bc/bin/uautomizer-j4sWxH34Be/config/AutomizerReach.xml -i ../../sv-benchmarks/c/ldv-regression/test20.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_826c9408-3f13-4516-a850-d6e4b8e324bc/bin/uautomizer-j4sWxH34Be/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_826c9408-3f13-4516-a850-d6e4b8e324bc/bin/uautomizer-j4sWxH34Be --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 d70ec4f924a7b66c3c5b4c9f4ff09d3682a4c192bf1d70fa04fe14236f51f678 .................................................................................................................................................................................................................................................................................... Execution finished normally Writing output log to file Ultimate.log Result: TRUE --- Real Ultimate output --- This is Ultimate 0.2.1-dev-e943c26 [2021-10-21 19:47:16,465 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-10-21 19:47:16,468 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-10-21 19:47:16,539 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-10-21 19:47:16,540 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-10-21 19:47:16,546 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-10-21 19:47:16,548 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-10-21 19:47:16,554 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-10-21 19:47:16,557 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-10-21 19:47:16,566 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-10-21 19:47:16,568 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-10-21 19:47:16,570 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-10-21 19:47:16,571 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-10-21 19:47:16,574 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-10-21 19:47:16,576 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-10-21 19:47:16,582 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-10-21 19:47:16,588 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-10-21 19:47:16,589 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-10-21 19:47:16,592 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-10-21 19:47:16,601 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-10-21 19:47:16,604 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-10-21 19:47:16,606 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-10-21 19:47:16,611 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-10-21 19:47:16,612 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-10-21 19:47:16,627 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-10-21 19:47:16,629 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-10-21 19:47:16,630 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-10-21 19:47:16,632 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-10-21 19:47:16,633 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-10-21 19:47:16,636 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-10-21 19:47:16,636 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-10-21 19:47:16,638 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-10-21 19:47:16,640 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-10-21 19:47:16,642 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-10-21 19:47:16,644 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-10-21 19:47:16,645 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-10-21 19:47:16,646 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-10-21 19:47:16,646 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-10-21 19:47:16,647 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-10-21 19:47:16,648 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-10-21 19:47:16,649 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-10-21 19:47:16,650 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_826c9408-3f13-4516-a850-d6e4b8e324bc/bin/uautomizer-j4sWxH34Be/config/svcomp-Reach-32bit-Automizer_Default.epf [2021-10-21 19:47:16,709 INFO L113 SettingsManager]: Loading preferences was successful [2021-10-21 19:47:16,710 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-10-21 19:47:16,711 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-10-21 19:47:16,711 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-10-21 19:47:16,713 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-10-21 19:47:16,713 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-10-21 19:47:16,714 INFO L138 SettingsManager]: * Use SBE=true [2021-10-21 19:47:16,714 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-10-21 19:47:16,714 INFO L138 SettingsManager]: * sizeof long=4 [2021-10-21 19:47:16,715 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-10-21 19:47:16,716 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-10-21 19:47:16,716 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-10-21 19:47:16,717 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-10-21 19:47:16,717 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-10-21 19:47:16,717 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-10-21 19:47:16,717 INFO L138 SettingsManager]: * sizeof long double=12 [2021-10-21 19:47:16,718 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-10-21 19:47:16,718 INFO L138 SettingsManager]: * Use constant arrays=true [2021-10-21 19:47:16,718 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-10-21 19:47:16,719 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-10-21 19:47:16,719 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-10-21 19:47:16,719 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-10-21 19:47:16,720 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-21 19:47:16,720 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-10-21 19:47:16,720 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-10-21 19:47:16,721 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-10-21 19:47:16,721 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-10-21 19:47:16,721 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-10-21 19:47:16,721 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-10-21 19:47:16,722 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-10-21 19:47:16,722 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-10-21 19:47:16,722 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-10-21 19:47:16,723 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:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_826c9408-3f13-4516-a850-d6e4b8e324bc/bin/uautomizer-j4sWxH34Be/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_826c9408-3f13-4516-a850-d6e4b8e324bc/bin/uautomizer-j4sWxH34Be Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> d70ec4f924a7b66c3c5b4c9f4ff09d3682a4c192bf1d70fa04fe14236f51f678 [2021-10-21 19:47:17,082 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-10-21 19:47:17,121 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-10-21 19:47:17,124 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-10-21 19:47:17,126 INFO L271 PluginConnector]: Initializing CDTParser... [2021-10-21 19:47:17,127 INFO L275 PluginConnector]: CDTParser initialized [2021-10-21 19:47:17,128 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_826c9408-3f13-4516-a850-d6e4b8e324bc/bin/uautomizer-j4sWxH34Be/../../sv-benchmarks/c/ldv-regression/test20.c [2021-10-21 19:47:17,236 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_826c9408-3f13-4516-a850-d6e4b8e324bc/bin/uautomizer-j4sWxH34Be/data/918341c8a/3dd5e5cdc0bf409c82c3915ea091e919/FLAG5282a3eba [2021-10-21 19:47:17,850 INFO L306 CDTParser]: Found 1 translation units. [2021-10-21 19:47:17,851 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_826c9408-3f13-4516-a850-d6e4b8e324bc/sv-benchmarks/c/ldv-regression/test20.c [2021-10-21 19:47:17,864 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_826c9408-3f13-4516-a850-d6e4b8e324bc/bin/uautomizer-j4sWxH34Be/data/918341c8a/3dd5e5cdc0bf409c82c3915ea091e919/FLAG5282a3eba [2021-10-21 19:47:18,214 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_826c9408-3f13-4516-a850-d6e4b8e324bc/bin/uautomizer-j4sWxH34Be/data/918341c8a/3dd5e5cdc0bf409c82c3915ea091e919 [2021-10-21 19:47:18,219 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-10-21 19:47:18,222 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-10-21 19:47:18,225 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-10-21 19:47:18,225 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-10-21 19:47:18,229 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-10-21 19:47:18,230 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.10 07:47:18" (1/1) ... [2021-10-21 19:47:18,232 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@8c9fdf2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.10 07:47:18, skipping insertion in model container [2021-10-21 19:47:18,233 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.10 07:47:18" (1/1) ... [2021-10-21 19:47:18,242 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-10-21 19:47:18,257 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-10-21 19:47:18,409 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_826c9408-3f13-4516-a850-d6e4b8e324bc/sv-benchmarks/c/ldv-regression/test20.c[377,390] [2021-10-21 19:47:18,416 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-21 19:47:18,426 INFO L203 MainTranslator]: Completed pre-run [2021-10-21 19:47:18,451 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_826c9408-3f13-4516-a850-d6e4b8e324bc/sv-benchmarks/c/ldv-regression/test20.c[377,390] [2021-10-21 19:47:18,452 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-21 19:47:18,467 INFO L208 MainTranslator]: Completed translation [2021-10-21 19:47:18,468 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.10 07:47:18 WrapperNode [2021-10-21 19:47:18,468 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-10-21 19:47:18,473 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-10-21 19:47:18,473 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-10-21 19:47:18,473 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-10-21 19:47:18,482 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.10 07:47:18" (1/1) ... [2021-10-21 19:47:18,492 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.10 07:47:18" (1/1) ... [2021-10-21 19:47:18,514 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-10-21 19:47:18,515 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-10-21 19:47:18,516 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-10-21 19:47:18,516 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-10-21 19:47:18,526 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.10 07:47:18" (1/1) ... [2021-10-21 19:47:18,526 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.10 07:47:18" (1/1) ... [2021-10-21 19:47:18,530 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.10 07:47:18" (1/1) ... [2021-10-21 19:47:18,530 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.10 07:47:18" (1/1) ... [2021-10-21 19:47:18,538 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.10 07:47:18" (1/1) ... [2021-10-21 19:47:18,541 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.10 07:47:18" (1/1) ... [2021-10-21 19:47:18,542 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.10 07:47:18" (1/1) ... [2021-10-21 19:47:18,550 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-10-21 19:47:18,551 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-10-21 19:47:18,551 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-10-21 19:47:18,553 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-10-21 19:47:18,554 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.10 07:47:18" (1/1) ... [2021-10-21 19:47:18,565 INFO L170 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-21 19:47:18,577 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_826c9408-3f13-4516-a850-d6e4b8e324bc/bin/uautomizer-j4sWxH34Be/z3 [2021-10-21 19:47:18,596 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_826c9408-3f13-4516-a850-d6e4b8e324bc/bin/uautomizer-j4sWxH34Be/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-10-21 19:47:18,612 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_826c9408-3f13-4516-a850-d6e4b8e324bc/bin/uautomizer-j4sWxH34Be/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-10-21 19:47:18,658 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-10-21 19:47:18,659 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-10-21 19:47:18,659 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-10-21 19:47:18,659 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-10-21 19:47:18,929 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-10-21 19:47:18,935 INFO L299 CfgBuilder]: Removed 6 assume(true) statements. [2021-10-21 19:47:18,937 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.10 07:47:18 BoogieIcfgContainer [2021-10-21 19:47:18,937 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-10-21 19:47:18,940 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-10-21 19:47:18,940 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-10-21 19:47:18,944 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-10-21 19:47:18,945 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.10 07:47:18" (1/3) ... [2021-10-21 19:47:18,946 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@26be486e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.10 07:47:18, skipping insertion in model container [2021-10-21 19:47:18,946 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.10 07:47:18" (2/3) ... [2021-10-21 19:47:18,947 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@26be486e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.10 07:47:18, skipping insertion in model container [2021-10-21 19:47:18,947 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.10 07:47:18" (3/3) ... [2021-10-21 19:47:18,949 INFO L111 eAbstractionObserver]: Analyzing ICFG test20.c [2021-10-21 19:47:18,959 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-10-21 19:47:18,959 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-10-21 19:47:19,028 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-10-21 19:47:19,040 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, mAutomataTypeConcurrency=PETRI_NET, 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 [2021-10-21 19:47:19,040 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-10-21 19:47:19,059 INFO L276 IsEmpty]: Start isEmpty. Operand has 9 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 8 states have internal predecessors, (9), 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) [2021-10-21 19:47:19,064 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2021-10-21 19:47:19,064 INFO L504 BasicCegarLoop]: Found error trace [2021-10-21 19:47:19,065 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2021-10-21 19:47:19,066 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-21 19:47:19,075 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-21 19:47:19,075 INFO L82 PathProgramCache]: Analyzing trace with hash 925607, now seen corresponding path program 1 times [2021-10-21 19:47:19,097 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-21 19:47:19,098 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1920945668] [2021-10-21 19:47:19,098 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-21 19:47:19,100 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-21 19:47:19,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-21 19:47:19,394 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-21 19:47:19,395 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-21 19:47:19,396 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1920945668] [2021-10-21 19:47:19,397 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1920945668] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-21 19:47:19,397 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-21 19:47:19,397 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-10-21 19:47:19,412 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1609880367] [2021-10-21 19:47:19,418 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-10-21 19:47:19,419 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-21 19:47:19,447 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-10-21 19:47:19,448 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-10-21 19:47:19,451 INFO L87 Difference]: Start difference. First operand has 9 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 8 states have internal predecessors, (9), 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 4 states, 4 states have (on average 1.0) internal successors, (4), 3 states have internal predecessors, (4), 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) [2021-10-21 19:47:19,527 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-21 19:47:19,527 INFO L93 Difference]: Finished difference Result 13 states and 12 transitions. [2021-10-21 19:47:19,528 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-10-21 19:47:19,529 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.0) internal successors, (4), 3 states have internal predecessors, (4), 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) Word has length 4 [2021-10-21 19:47:19,530 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-21 19:47:19,535 INFO L225 Difference]: With dead ends: 13 [2021-10-21 19:47:19,536 INFO L226 Difference]: Without dead ends: 0 [2021-10-21 19:47:19,538 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 31.7ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-10-21 19:47:19,573 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2021-10-21 19:47:19,578 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2021-10-21 19:47:19,579 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) [2021-10-21 19:47:19,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2021-10-21 19:47:19,582 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 4 [2021-10-21 19:47:19,582 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-21 19:47:19,582 INFO L470 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2021-10-21 19:47:19,583 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.0) internal successors, (4), 3 states have internal predecessors, (4), 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) [2021-10-21 19:47:19,583 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2021-10-21 19:47:19,583 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2021-10-21 19:47:19,587 INFO L764 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION [2021-10-21 19:47:19,587 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-10-21 19:47:19,590 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2021-10-21 19:47:19,594 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-21 19:47:19,613 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-21 19:47:19,615 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-21 19:47:19,640 INFO L857 garLoopResultBuilder]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2021-10-21 19:47:19,640 INFO L857 garLoopResultBuilder]: For program point L-1(line -1) no Hoare annotation was computed. [2021-10-21 19:47:19,641 INFO L857 garLoopResultBuilder]: For program point ULTIMATE.startENTRY(line -1) no Hoare annotation was computed. [2021-10-21 19:47:19,641 INFO L857 garLoopResultBuilder]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2021-10-21 19:47:19,641 INFO L857 garLoopResultBuilder]: For program point ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION(line 12) no Hoare annotation was computed. [2021-10-21 19:47:19,642 INFO L853 garLoopResultBuilder]: At program point L20(lines 18 21) the Hoare annotation is: (and (not (= |~#b~0.base| |~#a~0.base|)) (not (= ULTIMATE.start_equal_~a.base ULTIMATE.start_equal_~b.base))) [2021-10-21 19:47:19,643 INFO L853 garLoopResultBuilder]: At program point L13(lines 6 14) the Hoare annotation is: (and (not (= |~#b~0.base| |~#a~0.base|)) (not (= ULTIMATE.start_equal_~a.base ULTIMATE.start_equal_~b.base))) [2021-10-21 19:47:19,647 INFO L853 garLoopResultBuilder]: At program point L8(lines 6 14) the Hoare annotation is: false [2021-10-21 19:47:19,647 INFO L857 garLoopResultBuilder]: For program point L7(lines 7 9) no Hoare annotation was computed. [2021-10-21 19:47:19,652 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2021-10-21 19:47:19,670 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.10 07:47:19 BoogieIcfgContainer [2021-10-21 19:47:19,671 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-10-21 19:47:19,674 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-10-21 19:47:19,674 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-10-21 19:47:19,675 INFO L275 PluginConnector]: Witness Printer initialized [2021-10-21 19:47:19,676 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.10 07:47:18" (3/4) ... [2021-10-21 19:47:19,679 INFO L137 WitnessPrinter]: Generating witness for correct program [2021-10-21 19:47:19,691 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 8 nodes and edges [2021-10-21 19:47:19,691 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 4 nodes and edges [2021-10-21 19:47:19,692 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2021-10-21 19:47:19,692 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2021-10-21 19:47:19,741 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_826c9408-3f13-4516-a850-d6e4b8e324bc/bin/uautomizer-j4sWxH34Be/witness.graphml [2021-10-21 19:47:19,741 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-10-21 19:47:19,743 INFO L168 Benchmark]: Toolchain (without parser) took 1520.48 ms. Allocated memory was 96.5 MB in the beginning and 119.5 MB in the end (delta: 23.1 MB). Free memory was 63.7 MB in the beginning and 90.7 MB in the end (delta: -26.9 MB). There was no memory consumed. Max. memory is 16.1 GB. [2021-10-21 19:47:19,744 INFO L168 Benchmark]: CDTParser took 0.29 ms. Allocated memory is still 96.5 MB. Free memory is still 50.5 MB. There was no memory consumed. Max. memory is 16.1 GB. [2021-10-21 19:47:19,744 INFO L168 Benchmark]: CACSL2BoogieTranslator took 244.14 ms. Allocated memory is still 96.5 MB. Free memory was 63.6 MB in the beginning and 73.3 MB in the end (delta: -9.7 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2021-10-21 19:47:19,745 INFO L168 Benchmark]: Boogie Procedure Inliner took 41.82 ms. Allocated memory is still 96.5 MB. Free memory was 73.3 MB in the beginning and 71.9 MB in the end (delta: 1.3 MB). There was no memory consumed. Max. memory is 16.1 GB. [2021-10-21 19:47:19,745 INFO L168 Benchmark]: Boogie Preprocessor took 34.53 ms. Allocated memory is still 96.5 MB. Free memory was 71.9 MB in the beginning and 70.9 MB in the end (delta: 1.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-10-21 19:47:19,746 INFO L168 Benchmark]: RCFGBuilder took 386.36 ms. Allocated memory is still 96.5 MB. Free memory was 70.9 MB in the beginning and 61.9 MB in the end (delta: 9.0 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2021-10-21 19:47:19,746 INFO L168 Benchmark]: TraceAbstraction took 731.46 ms. Allocated memory was 96.5 MB in the beginning and 119.5 MB in the end (delta: 23.1 MB). Free memory was 61.4 MB in the beginning and 93.0 MB in the end (delta: -31.7 MB). There was no memory consumed. Max. memory is 16.1 GB. [2021-10-21 19:47:19,747 INFO L168 Benchmark]: Witness Printer took 67.06 ms. Allocated memory is still 119.5 MB. Free memory was 92.8 MB in the beginning and 90.7 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-10-21 19:47:19,750 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.29 ms. Allocated memory is still 96.5 MB. Free memory is still 50.5 MB. There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 244.14 ms. Allocated memory is still 96.5 MB. Free memory was 63.6 MB in the beginning and 73.3 MB in the end (delta: -9.7 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 41.82 ms. Allocated memory is still 96.5 MB. Free memory was 73.3 MB in the beginning and 71.9 MB in the end (delta: 1.3 MB). There was no memory consumed. Max. memory is 16.1 GB. * Boogie Preprocessor took 34.53 ms. Allocated memory is still 96.5 MB. Free memory was 71.9 MB in the beginning and 70.9 MB in the end (delta: 1.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 386.36 ms. Allocated memory is still 96.5 MB. Free memory was 70.9 MB in the beginning and 61.9 MB in the end (delta: 9.0 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * TraceAbstraction took 731.46 ms. Allocated memory was 96.5 MB in the beginning and 119.5 MB in the end (delta: 23.1 MB). Free memory was 61.4 MB in the beginning and 93.0 MB in the end (delta: -31.7 MB). There was no memory consumed. Max. memory is 16.1 GB. * Witness Printer took 67.06 ms. Allocated memory is still 119.5 MB. Free memory was 92.8 MB in the beginning and 90.7 MB in the end (delta: 2.1 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: 12]: 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 1 procedures, 9 locations, 1 error locations. Started 1 CEGAR loops. OverallTime: 626.0ms, OverallIterations: 1, TraceHistogramMax: 1, EmptinessCheckTime: 10.4ms, AutomataDifference: 118.9ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 51.6ms, InitialAbstractionConstructionTime: 13.9ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 4 SDtfs, 9 SDslu, 1 SDs, 0 SdLazy, 2 SolverSat, 0 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 17.3ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 31.7ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=9occurred in iteration=0, InterpolantAutomatonStates: 4, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 10.2ms AutomataMinimizationTime, 1 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: 0.0ms HoareAnnotationTime, 3 LocationsWithAnnotation, 3 PreInvPairs, 5 NumberOfFragments, 19 HoareAnnotationTreeSize, 3 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 27.3ms HoareSimplificationTime, 3 FomulaSimplificationsInter, 0 FormulaSimplificationTreeSizeReductionInter, 16.9ms HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 12.8ms SsaConstructionTime, 57.1ms SatisfiabilityAnalysisTime, 151.0ms InterpolantComputationTime, 4 NumberOfCodeBlocks, 4 NumberOfCodeBlocksAsserted, 1 NumberOfCheckSat, 3 ConstructedInterpolants, 0 QuantifiedInterpolants, 9 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 1 InterpolantComputations, 1 PerfectInterpolantSequences, 0/0 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: 6]: Loop Invariant Derived loop invariant: !(b == a) && !(a == b) - InvariantResult [Line: 18]: Loop Invariant Derived loop invariant: !(b == a) && !(a == b) - InvariantResult [Line: 6]: Loop Invariant Derived loop invariant: 0 RESULT: Ultimate proved your program to be correct! [2021-10-21 19:47:19,797 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_826c9408-3f13-4516-a850-d6e4b8e324bc/bin/uautomizer-j4sWxH34Be/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request...