./Ultimate.py --spec ../../sv-benchmarks/c/properties/no-overflow.prp --file ../../sv-benchmarks/c/list-simple/dll2c_remove_all_reverse.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for overflows Using default analysis Version 6b4ec56b Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb602de-6bd5-4396-b869-66f38132a452/bin/ukojak-pZX7IvK2PQ/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb602de-6bd5-4396-b869-66f38132a452/bin/ukojak-pZX7IvK2PQ/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb602de-6bd5-4396-b869-66f38132a452/bin/ukojak-pZX7IvK2PQ/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb602de-6bd5-4396-b869-66f38132a452/bin/ukojak-pZX7IvK2PQ/config/KojakReach.xml -i ../../sv-benchmarks/c/list-simple/dll2c_remove_all_reverse.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb602de-6bd5-4396-b869-66f38132a452/bin/ukojak-pZX7IvK2PQ/config/svcomp-Overflow-32bit-Kojak_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb602de-6bd5-4396-b869-66f38132a452/bin/ukojak-pZX7IvK2PQ --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! overflow) ) --witnessprinter.graph.data.producer Kojak --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash a81d76a671fec08918102c7898e8919d02b265d05707efa1508363dab4714d44 --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-6b4ec56 [2022-11-20 16:53:00,185 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-20 16:53:00,188 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-20 16:53:00,229 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-20 16:53:00,229 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-20 16:53:00,233 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-20 16:53:00,236 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-20 16:53:00,239 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-20 16:53:00,241 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-20 16:53:00,243 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-20 16:53:00,245 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-20 16:53:00,246 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-20 16:53:00,247 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-20 16:53:00,248 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-20 16:53:00,250 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-20 16:53:00,252 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-20 16:53:00,253 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-20 16:53:00,253 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-20 16:53:00,255 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-20 16:53:00,256 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-20 16:53:00,257 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-20 16:53:00,264 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-20 16:53:00,265 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-20 16:53:00,266 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-20 16:53:00,270 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-20 16:53:00,271 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-20 16:53:00,271 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-20 16:53:00,272 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-20 16:53:00,272 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-20 16:53:00,273 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-20 16:53:00,274 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-20 16:53:00,275 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-20 16:53:00,276 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-20 16:53:00,276 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-20 16:53:00,281 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-20 16:53:00,283 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-20 16:53:00,284 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-20 16:53:00,284 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-20 16:53:00,284 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-20 16:53:00,288 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-20 16:53:00,289 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-20 16:53:00,290 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb602de-6bd5-4396-b869-66f38132a452/bin/ukojak-pZX7IvK2PQ/config/svcomp-Overflow-32bit-Kojak_Default.epf [2022-11-20 16:53:00,336 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-20 16:53:00,337 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-20 16:53:00,338 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-20 16:53:00,338 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ALWAYS [2022-11-20 16:53:00,339 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-11-20 16:53:00,339 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-11-20 16:53:00,340 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-20 16:53:00,340 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-20 16:53:00,340 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2022-11-20 16:53:00,340 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-20 16:53:00,341 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-20 16:53:00,342 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-20 16:53:00,342 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-20 16:53:00,342 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-20 16:53:00,342 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-20 16:53:00,342 INFO L138 SettingsManager]: * Check absence of signed integer overflows=true [2022-11-20 16:53:00,343 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-20 16:53:00,343 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-20 16:53:00,343 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-20 16:53:00,343 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-20 16:53:00,343 INFO L136 SettingsManager]: Preferences of CodeCheck differ from their defaults: [2022-11-20 16:53:00,344 INFO L138 SettingsManager]: * Timeout in seconds=1000000 [2022-11-20 16:53:00,344 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-20 16:53:00,344 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:10000 [2022-11-20 16:53:00,344 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-20 16:53:00,344 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-20 16:53:00,345 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-20 16:53:00,345 INFO L138 SettingsManager]: * Trace refinement strategy=PENGUIN [2022-11-20 16:53:00,346 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-20 16:53:00,346 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-20 16:53:00,346 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_feb602de-6bd5-4396-b869-66f38132a452/bin/ukojak-pZX7IvK2PQ/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb602de-6bd5-4396-b869-66f38132a452/bin/ukojak-pZX7IvK2PQ Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! overflow) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Kojak Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> a81d76a671fec08918102c7898e8919d02b265d05707efa1508363dab4714d44 [2022-11-20 16:53:00,657 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-20 16:53:00,692 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-20 16:53:00,695 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-20 16:53:00,696 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-20 16:53:00,697 INFO L275 PluginConnector]: CDTParser initialized [2022-11-20 16:53:00,698 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb602de-6bd5-4396-b869-66f38132a452/bin/ukojak-pZX7IvK2PQ/../../sv-benchmarks/c/list-simple/dll2c_remove_all_reverse.i [2022-11-20 16:53:03,749 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-20 16:53:04,055 INFO L351 CDTParser]: Found 1 translation units. [2022-11-20 16:53:04,055 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb602de-6bd5-4396-b869-66f38132a452/sv-benchmarks/c/list-simple/dll2c_remove_all_reverse.i [2022-11-20 16:53:04,068 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb602de-6bd5-4396-b869-66f38132a452/bin/ukojak-pZX7IvK2PQ/data/6b471c64d/1809ca30c90744c2aaf9e606a2c8e3bb/FLAGdd39776d1 [2022-11-20 16:53:04,083 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb602de-6bd5-4396-b869-66f38132a452/bin/ukojak-pZX7IvK2PQ/data/6b471c64d/1809ca30c90744c2aaf9e606a2c8e3bb [2022-11-20 16:53:04,086 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-20 16:53:04,087 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-20 16:53:04,089 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-20 16:53:04,089 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-20 16:53:04,092 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-20 16:53:04,093 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 04:53:04" (1/1) ... [2022-11-20 16:53:04,094 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@45f9ae3d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 04:53:04, skipping insertion in model container [2022-11-20 16:53:04,094 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 04:53:04" (1/1) ... [2022-11-20 16:53:04,102 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-20 16:53:04,144 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-20 16:53:04,494 WARN L237 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_feb602de-6bd5-4396-b869-66f38132a452/sv-benchmarks/c/list-simple/dll2c_remove_all_reverse.i[24177,24190] [2022-11-20 16:53:04,495 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-20 16:53:04,516 INFO L203 MainTranslator]: Completed pre-run [2022-11-20 16:53:04,582 WARN L237 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_feb602de-6bd5-4396-b869-66f38132a452/sv-benchmarks/c/list-simple/dll2c_remove_all_reverse.i[24177,24190] [2022-11-20 16:53:04,583 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-20 16:53:04,607 INFO L208 MainTranslator]: Completed translation [2022-11-20 16:53:04,608 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 04:53:04 WrapperNode [2022-11-20 16:53:04,608 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-20 16:53:04,609 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-20 16:53:04,609 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-20 16:53:04,609 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-20 16:53:04,615 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 04:53:04" (1/1) ... [2022-11-20 16:53:04,628 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 04:53:04" (1/1) ... [2022-11-20 16:53:04,651 INFO L138 Inliner]: procedures = 126, calls = 37, calls flagged for inlining = 5, calls inlined = 5, statements flattened = 109 [2022-11-20 16:53:04,651 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-20 16:53:04,652 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-20 16:53:04,652 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-20 16:53:04,652 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-20 16:53:04,661 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 04:53:04" (1/1) ... [2022-11-20 16:53:04,661 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 04:53:04" (1/1) ... [2022-11-20 16:53:04,666 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 04:53:04" (1/1) ... [2022-11-20 16:53:04,666 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 04:53:04" (1/1) ... [2022-11-20 16:53:04,674 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 04:53:04" (1/1) ... [2022-11-20 16:53:04,680 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 04:53:04" (1/1) ... [2022-11-20 16:53:04,681 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 04:53:04" (1/1) ... [2022-11-20 16:53:04,683 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 04:53:04" (1/1) ... [2022-11-20 16:53:04,685 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-20 16:53:04,686 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-20 16:53:04,686 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-20 16:53:04,687 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-20 16:53:04,687 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 04:53:04" (1/1) ... [2022-11-20 16:53:04,693 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:10000 [2022-11-20 16:53:04,706 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb602de-6bd5-4396-b869-66f38132a452/bin/ukojak-pZX7IvK2PQ/z3 [2022-11-20 16:53:04,721 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb602de-6bd5-4396-b869-66f38132a452/bin/ukojak-pZX7IvK2PQ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:10000 (exit command is (exit), workingDir is null) [2022-11-20 16:53:04,733 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb602de-6bd5-4396-b869-66f38132a452/bin/ukojak-pZX7IvK2PQ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:10000 (1)] Waiting until timeout for monitored process [2022-11-20 16:53:04,767 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-11-20 16:53:04,767 INFO L130 BoogieDeclarations]: Found specification of procedure node_create [2022-11-20 16:53:04,768 INFO L138 BoogieDeclarations]: Found implementation of procedure node_create [2022-11-20 16:53:04,768 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2022-11-20 16:53:04,768 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-20 16:53:04,768 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-11-20 16:53:04,768 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2022-11-20 16:53:04,768 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2022-11-20 16:53:04,768 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-11-20 16:53:04,768 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2022-11-20 16:53:04,769 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-20 16:53:04,769 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-20 16:53:04,769 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-20 16:53:04,896 INFO L235 CfgBuilder]: Building ICFG [2022-11-20 16:53:04,898 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-20 16:53:05,216 INFO L276 CfgBuilder]: Performing block encoding [2022-11-20 16:53:05,362 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-20 16:53:05,363 INFO L300 CfgBuilder]: Removed 2 assume(true) statements. [2022-11-20 16:53:05,365 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 04:53:05 BoogieIcfgContainer [2022-11-20 16:53:05,365 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-20 16:53:05,366 INFO L113 PluginConnector]: ------------------------CodeCheck---------------------------- [2022-11-20 16:53:05,366 INFO L271 PluginConnector]: Initializing CodeCheck... [2022-11-20 16:53:05,386 INFO L275 PluginConnector]: CodeCheck initialized [2022-11-20 16:53:05,387 INFO L185 PluginConnector]: Executing the observer CodeCheckObserver from plugin CodeCheck for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 04:53:05" (1/1) ... [2022-11-20 16:53:05,399 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 16:53:05,461 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2022-11-20 16:53:05,469 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 20 states and 23 transitions. [2022-11-20 16:53:05,470 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 23 transitions. [2022-11-20 16:53:05,475 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-11-20 16:53:05,476 INFO L422 CodeCheckObserver]: Error Path is FOUND. [2022-11-20 16:53:05,477 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 16:53:05,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 16:53:05,964 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 16:53:06,058 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2022-11-20 16:53:06,059 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 21 states and 25 transitions. [2022-11-20 16:53:06,059 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2022-11-20 16:53:06,060 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-11-20 16:53:06,060 INFO L422 CodeCheckObserver]: Error Path is FOUND. [2022-11-20 16:53:06,061 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 16:53:06,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 16:53:06,263 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-20 16:53:06,305 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2022-11-20 16:53:06,306 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 24 states and 29 transitions. [2022-11-20 16:53:06,306 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 29 transitions. [2022-11-20 16:53:06,307 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-11-20 16:53:06,307 INFO L422 CodeCheckObserver]: Error Path is FOUND. [2022-11-20 16:53:06,307 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 16:53:06,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 16:53:06,408 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-20 16:53:06,425 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2022-11-20 16:53:06,425 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 25 states and 30 transitions. [2022-11-20 16:53:06,426 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 30 transitions. [2022-11-20 16:53:06,426 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-11-20 16:53:06,426 INFO L422 CodeCheckObserver]: Error Path is FOUND. [2022-11-20 16:53:06,427 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 16:53:06,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 16:53:06,696 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-20 16:53:06,798 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2022-11-20 16:53:06,800 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 27 states and 34 transitions. [2022-11-20 16:53:06,800 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 34 transitions. [2022-11-20 16:53:06,801 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2022-11-20 16:53:06,801 INFO L422 CodeCheckObserver]: Error Path is FOUND. [2022-11-20 16:53:06,802 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 16:53:06,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 16:53:06,999 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-20 16:53:07,026 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2022-11-20 16:53:07,027 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 28 states and 35 transitions. [2022-11-20 16:53:07,027 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 35 transitions. [2022-11-20 16:53:07,029 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-11-20 16:53:07,029 INFO L422 CodeCheckObserver]: Error Path is FOUND. [2022-11-20 16:53:07,030 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 16:53:07,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 16:53:07,285 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-20 16:53:07,433 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2022-11-20 16:53:07,434 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 30 states and 39 transitions. [2022-11-20 16:53:07,434 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 39 transitions. [2022-11-20 16:53:07,435 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-11-20 16:53:07,435 INFO L422 CodeCheckObserver]: Error Path is FOUND. [2022-11-20 16:53:07,436 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 16:53:07,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 16:53:07,616 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-20 16:53:07,685 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2022-11-20 16:53:07,685 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 24 states and 30 transitions. [2022-11-20 16:53:07,685 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 30 transitions. [2022-11-20 16:53:07,686 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-11-20 16:53:07,686 INFO L422 CodeCheckObserver]: Error Path is FOUND. [2022-11-20 16:53:07,687 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 16:53:07,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 16:53:07,925 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-20 16:53:08,211 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2022-11-20 16:53:08,211 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 23 states and 27 transitions. [2022-11-20 16:53:08,212 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 27 transitions. [2022-11-20 16:53:08,212 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-11-20 16:53:08,212 INFO L422 CodeCheckObserver]: Error Path is FOUND. [2022-11-20 16:53:08,212 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 16:53:08,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 16:53:08,674 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-20 16:53:09,915 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2022-11-20 16:53:09,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 21 states and 22 transitions. [2022-11-20 16:53:09,916 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2022-11-20 16:53:09,916 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2022-11-20 16:53:09,916 WARN L419 CodeCheckObserver]: This Program is SAFE, Check terminated with 10 iterations. [2022-11-20 16:53:09,926 INFO L754 CodeCheckObserver]: All specifications hold 4 specifications checked. All of them hold [2022-11-20 16:53:10,035 INFO L560 CodeCheckObserver]: Invariant with dag size 6 [2022-11-20 16:53:10,046 INFO L560 CodeCheckObserver]: Invariant with dag size 1 [2022-11-20 16:53:10,047 INFO L560 CodeCheckObserver]: Invariant with dag size 1 [2022-11-20 16:53:10,049 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.codecheck CFG 20.11 04:53:10 ImpRootNode [2022-11-20 16:53:10,049 INFO L132 PluginConnector]: ------------------------ END CodeCheck---------------------------- [2022-11-20 16:53:10,049 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2022-11-20 16:53:10,050 INFO L271 PluginConnector]: Initializing Witness Printer... [2022-11-20 16:53:10,050 INFO L275 PluginConnector]: Witness Printer initialized [2022-11-20 16:53:10,050 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 04:53:05" (3/4) ... [2022-11-20 16:53:10,062 INFO L137 WitnessPrinter]: Generating witness for correct program [2022-11-20 16:53:10,070 INFO L361 RCFGBacktranslator]: Ignoring RootEdge to procedure node_create [2022-11-20 16:53:10,079 INFO L915 BoogieBacktranslator]: Reduced CFG by removing 26 nodes and edges [2022-11-20 16:53:10,079 INFO L915 BoogieBacktranslator]: Reduced CFG by removing 10 nodes and edges [2022-11-20 16:53:10,080 INFO L915 BoogieBacktranslator]: Reduced CFG by removing 3 nodes and edges [2022-11-20 16:53:10,080 INFO L915 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2022-11-20 16:53:10,131 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb602de-6bd5-4396-b869-66f38132a452/bin/ukojak-pZX7IvK2PQ/witness.graphml [2022-11-20 16:53:10,132 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2022-11-20 16:53:10,133 INFO L158 Benchmark]: Toolchain (without parser) took 6045.22ms. Allocated memory was 146.8MB in the beginning and 176.2MB in the end (delta: 29.4MB). Free memory was 114.7MB in the beginning and 131.1MB in the end (delta: -16.4MB). Peak memory consumption was 15.3MB. Max. memory is 16.1GB. [2022-11-20 16:53:10,133 INFO L158 Benchmark]: CDTParser took 0.26ms. Allocated memory is still 117.4MB. Free memory is still 94.8MB. There was no memory consumed. Max. memory is 16.1GB. [2022-11-20 16:53:10,133 INFO L158 Benchmark]: CACSL2BoogieTranslator took 519.64ms. Allocated memory is still 146.8MB. Free memory was 114.7MB in the beginning and 97.3MB in the end (delta: 17.4MB). Peak memory consumption was 16.8MB. Max. memory is 16.1GB. [2022-11-20 16:53:10,134 INFO L158 Benchmark]: Boogie Procedure Inliner took 42.25ms. Allocated memory is still 146.8MB. Free memory was 97.3MB in the beginning and 95.5MB in the end (delta: 1.9MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2022-11-20 16:53:10,134 INFO L158 Benchmark]: Boogie Preprocessor took 33.57ms. Allocated memory is still 146.8MB. Free memory was 95.5MB in the beginning and 93.8MB in the end (delta: 1.6MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2022-11-20 16:53:10,135 INFO L158 Benchmark]: RCFGBuilder took 679.28ms. Allocated memory is still 146.8MB. Free memory was 93.5MB in the beginning and 70.8MB in the end (delta: 22.7MB). Peak memory consumption was 23.1MB. Max. memory is 16.1GB. [2022-11-20 16:53:10,135 INFO L158 Benchmark]: CodeCheck took 4682.99ms. Allocated memory was 146.8MB in the beginning and 176.2MB in the end (delta: 29.4MB). Free memory was 70.8MB in the beginning and 134.2MB in the end (delta: -63.4MB). There was no memory consumed. Max. memory is 16.1GB. [2022-11-20 16:53:10,136 INFO L158 Benchmark]: Witness Printer took 82.40ms. Allocated memory is still 176.2MB. Free memory was 134.2MB in the beginning and 131.1MB in the end (delta: 3.1MB). Peak memory consumption was 4.2MB. Max. memory is 16.1GB. [2022-11-20 16:53:10,138 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.codecheck: - StatisticsResult: Ultimate CodeCheck benchmark data CFG has 2 procedures, 20 locations, 4 error locations. Started 1 CEGAR loops. OverallTime: 4.5s, OverallIterations: 10, TraceHistogramMax: 0, PathProgramHistogramMax: 0, EmptinessCheckTime: 0.0s, AutomataDifference: 0.0s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 0 mSolverCounterUnknown, 360 SdHoareTripleChecker+Valid, 1.7s IncrementalHoareTripleChecker+Time, 0 mSdLazyCounter, 82 mSDsluCounter, 183 SdHoareTripleChecker+Invalid, 1.5s Time, 0 mProtectedAction, 0 SdHoareTripleChecker+Unchecked, 0 IncrementalHoareTripleChecker+Unchecked, 30 mSDsCounter, 145 IncrementalHoareTripleChecker+Valid, 0 mProtectedPredicate, 494 IncrementalHoareTripleChecker+Invalid, 639 SdHoareTripleChecker+Unknown, 0 mSolverCounterNotChecked, 145 mSolverCounterUnsat, 153 mSDtfsCounter, 494 mSolverCounterSat, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Unknown, PredicateUnifierStatistics: 0 DeclaredPredicates, 1050 GetRequests, 978 SyntacticMatches, 0 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1899 ImplicationChecksByTransitivity, 1.7s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=-1occurred in iteration=-1, InterpolantAutomatonStates: 0, traceCheckStatistics: 0.1s SsaConstructionTime, 0.3s SatisfiabilityAnalysisTime, 1.7s InterpolantComputationTime, 156 NumberOfCodeBlocks, 156 NumberOfCodeBlocksAsserted, 9 NumberOfCheckSat, 147 ConstructedInterpolants, 0 QuantifiedInterpolants, 285 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 9 InterpolantComputations, 5 PerfectInterpolantSequences, 41/51 InterpolantCoveringCapability, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: No data available, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: No data available, ReuseStatistics: No data available - PositiveResult [Line: 595]: integer overflow can never occur For all program executions holds that integer overflow can never occur at this location - PositiveResult [Line: 595]: integer overflow can never occur For all program executions holds that integer overflow can never occur at this location - PositiveResult [Line: 618]: integer overflow can never occur For all program executions holds that integer overflow can never occur at this location - PositiveResult [Line: 618]: integer overflow can never occur For all program executions holds that integer overflow can never occur at this location - AllSpecificationsHoldResult: All specifications hold 4 specifications checked. All of them hold - InvariantResult [Line: 618]: Loop Invariant Derived loop invariant: i == 0 || 1 <= i - InvariantResult [Line: 588]: Loop Invariant Derived loop invariant: 1 - InvariantResult [Line: 573]: Loop Invariant Derived loop invariant: 1 * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.26ms. Allocated memory is still 117.4MB. Free memory is still 94.8MB. There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 519.64ms. Allocated memory is still 146.8MB. Free memory was 114.7MB in the beginning and 97.3MB in the end (delta: 17.4MB). Peak memory consumption was 16.8MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 42.25ms. Allocated memory is still 146.8MB. Free memory was 97.3MB in the beginning and 95.5MB in the end (delta: 1.9MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Boogie Preprocessor took 33.57ms. Allocated memory is still 146.8MB. Free memory was 95.5MB in the beginning and 93.8MB in the end (delta: 1.6MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * RCFGBuilder took 679.28ms. Allocated memory is still 146.8MB. Free memory was 93.5MB in the beginning and 70.8MB in the end (delta: 22.7MB). Peak memory consumption was 23.1MB. Max. memory is 16.1GB. * CodeCheck took 4682.99ms. Allocated memory was 146.8MB in the beginning and 176.2MB in the end (delta: 29.4MB). Free memory was 70.8MB in the beginning and 134.2MB in the end (delta: -63.4MB). There was no memory consumed. Max. memory is 16.1GB. * Witness Printer took 82.40ms. Allocated memory is still 176.2MB. Free memory was 134.2MB in the beginning and 131.1MB in the end (delta: 3.1MB). Peak memory consumption was 4.2MB. Max. memory is 16.1GB. RESULT: Ultimate proved your program to be correct! [2022-11-20 16:53:10,157 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb602de-6bd5-4396-b869-66f38132a452/bin/ukojak-pZX7IvK2PQ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:10000 (1)] Ended with exit code 0 Received shutdown request... --- End real Ultimate output --- Execution finished normally Writing output log to file Ultimate.log Result: TRUE