./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/pthread-wmm/safe016_power.opt.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 6b4ec56b Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66cca230-e0e7-4156-8262-5e355d840a70/bin/uautomizer-ug76WZFUDN/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66cca230-e0e7-4156-8262-5e355d840a70/bin/uautomizer-ug76WZFUDN/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66cca230-e0e7-4156-8262-5e355d840a70/bin/uautomizer-ug76WZFUDN/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66cca230-e0e7-4156-8262-5e355d840a70/bin/uautomizer-ug76WZFUDN/config/AutomizerMemDerefMemtrack.xml -i ../../sv-benchmarks/c/pthread-wmm/safe016_power.opt.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66cca230-e0e7-4156-8262-5e355d840a70/bin/uautomizer-ug76WZFUDN/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66cca230-e0e7-4156-8262-5e355d840a70/bin/uautomizer-ug76WZFUDN --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 6b69d29db6700923687b32c5d8fab6e8f05fe2198d87348098263d957793e472 --- 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 12:36:51,235 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-20 12:36:51,239 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-20 12:36:51,279 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-20 12:36:51,282 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-20 12:36:51,286 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-20 12:36:51,289 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-20 12:36:51,293 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-20 12:36:51,296 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-20 12:36:51,303 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-20 12:36:51,305 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-20 12:36:51,307 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-20 12:36:51,308 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-20 12:36:51,314 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-20 12:36:51,316 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-20 12:36:51,318 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-20 12:36:51,320 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-20 12:36:51,321 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-20 12:36:51,323 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-20 12:36:51,331 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-20 12:36:51,333 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-20 12:36:51,335 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-20 12:36:51,337 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-20 12:36:51,338 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-20 12:36:51,350 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-20 12:36:51,352 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-20 12:36:51,352 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-20 12:36:51,354 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-20 12:36:51,355 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-20 12:36:51,356 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-20 12:36:51,357 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-20 12:36:51,358 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-20 12:36:51,360 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-20 12:36:51,361 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-20 12:36:51,362 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-20 12:36:51,363 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-20 12:36:51,364 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-20 12:36:51,364 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-20 12:36:51,365 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-20 12:36:51,366 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-20 12:36:51,367 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-20 12:36:51,368 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66cca230-e0e7-4156-8262-5e355d840a70/bin/uautomizer-ug76WZFUDN/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf [2022-11-20 12:36:51,414 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-20 12:36:51,415 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-20 12:36:51,416 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-20 12:36:51,416 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-20 12:36:51,417 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-20 12:36:51,418 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-20 12:36:51,418 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-11-20 12:36:51,419 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-11-20 12:36:51,419 INFO L138 SettingsManager]: * Use SBE=true [2022-11-20 12:36:51,420 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-20 12:36:51,421 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-20 12:36:51,421 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2022-11-20 12:36:51,422 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-20 12:36:51,422 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-20 12:36:51,422 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-20 12:36:51,423 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2022-11-20 12:36:51,423 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2022-11-20 12:36:51,423 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2022-11-20 12:36:51,424 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-20 12:36:51,424 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2022-11-20 12:36:51,424 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-20 12:36:51,425 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-20 12:36:51,425 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-20 12:36:51,426 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-11-20 12:36:51,426 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-20 12:36:51,426 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-20 12:36:51,427 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-20 12:36:51,427 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-20 12:36:51,428 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2022-11-20 12:36:51,428 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-20 12:36:51,428 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_66cca230-e0e7-4156-8262-5e355d840a70/bin/uautomizer-ug76WZFUDN/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66cca230-e0e7-4156-8262-5e355d840a70/bin/uautomizer-ug76WZFUDN Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 6b69d29db6700923687b32c5d8fab6e8f05fe2198d87348098263d957793e472 [2022-11-20 12:36:51,833 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-20 12:36:51,872 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-20 12:36:51,875 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-20 12:36:51,877 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-20 12:36:51,878 INFO L275 PluginConnector]: CDTParser initialized [2022-11-20 12:36:51,879 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66cca230-e0e7-4156-8262-5e355d840a70/bin/uautomizer-ug76WZFUDN/../../sv-benchmarks/c/pthread-wmm/safe016_power.opt.i [2022-11-20 12:36:55,172 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-20 12:36:55,572 INFO L351 CDTParser]: Found 1 translation units. [2022-11-20 12:36:55,573 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66cca230-e0e7-4156-8262-5e355d840a70/sv-benchmarks/c/pthread-wmm/safe016_power.opt.i [2022-11-20 12:36:55,600 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66cca230-e0e7-4156-8262-5e355d840a70/bin/uautomizer-ug76WZFUDN/data/81e3e3e93/eff2397de21b49ce8ad224b91b1e7e1a/FLAGbfbaa1d26 [2022-11-20 12:36:55,627 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66cca230-e0e7-4156-8262-5e355d840a70/bin/uautomizer-ug76WZFUDN/data/81e3e3e93/eff2397de21b49ce8ad224b91b1e7e1a [2022-11-20 12:36:55,630 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-20 12:36:55,633 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-20 12:36:55,637 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-20 12:36:55,637 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-20 12:36:55,642 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-20 12:36:55,643 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 12:36:55" (1/1) ... [2022-11-20 12:36:55,644 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@15384128 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 12:36:55, skipping insertion in model container [2022-11-20 12:36:55,644 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 12:36:55" (1/1) ... [2022-11-20 12:36:55,653 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-20 12:36:55,717 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-20 12:36:55,955 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_66cca230-e0e7-4156-8262-5e355d840a70/sv-benchmarks/c/pthread-wmm/safe016_power.opt.i[951,964] [2022-11-20 12:36:56,249 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-20 12:36:56,274 INFO L203 MainTranslator]: Completed pre-run [2022-11-20 12:36:56,291 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_66cca230-e0e7-4156-8262-5e355d840a70/sv-benchmarks/c/pthread-wmm/safe016_power.opt.i[951,964] [2022-11-20 12:36:56,390 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-20 12:36:56,430 INFO L208 MainTranslator]: Completed translation [2022-11-20 12:36:56,431 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 12:36:56 WrapperNode [2022-11-20 12:36:56,431 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-20 12:36:56,432 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-20 12:36:56,432 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-20 12:36:56,433 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-20 12:36:56,440 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 12:36:56" (1/1) ... [2022-11-20 12:36:56,472 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 12:36:56" (1/1) ... [2022-11-20 12:36:56,506 INFO L138 Inliner]: procedures = 177, calls = 91, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 181 [2022-11-20 12:36:56,507 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-20 12:36:56,508 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-20 12:36:56,508 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-20 12:36:56,508 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-20 12:36:56,519 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 12:36:56" (1/1) ... [2022-11-20 12:36:56,520 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 12:36:56" (1/1) ... [2022-11-20 12:36:56,526 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 12:36:56" (1/1) ... [2022-11-20 12:36:56,526 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 12:36:56" (1/1) ... [2022-11-20 12:36:56,543 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 12:36:56" (1/1) ... [2022-11-20 12:36:56,547 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 12:36:56" (1/1) ... [2022-11-20 12:36:56,551 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 12:36:56" (1/1) ... [2022-11-20 12:36:56,554 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 12:36:56" (1/1) ... [2022-11-20 12:36:56,560 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-20 12:36:56,561 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-20 12:36:56,561 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-20 12:36:56,561 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-20 12:36:56,562 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 12:36:56" (1/1) ... [2022-11-20 12:36:56,570 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-20 12:36:56,585 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66cca230-e0e7-4156-8262-5e355d840a70/bin/uautomizer-ug76WZFUDN/z3 [2022-11-20 12:36:56,600 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66cca230-e0e7-4156-8262-5e355d840a70/bin/uautomizer-ug76WZFUDN/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-20 12:36:56,611 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66cca230-e0e7-4156-8262-5e355d840a70/bin/uautomizer-ug76WZFUDN/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-20 12:36:56,649 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-11-20 12:36:56,649 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-11-20 12:36:56,649 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_atomic_begin [2022-11-20 12:36:56,650 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-20 12:36:56,650 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-11-20 12:36:56,650 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-11-20 12:36:56,650 INFO L130 BoogieDeclarations]: Found specification of procedure P0 [2022-11-20 12:36:56,650 INFO L138 BoogieDeclarations]: Found implementation of procedure P0 [2022-11-20 12:36:56,650 INFO L130 BoogieDeclarations]: Found specification of procedure P1 [2022-11-20 12:36:56,651 INFO L138 BoogieDeclarations]: Found implementation of procedure P1 [2022-11-20 12:36:56,651 INFO L130 BoogieDeclarations]: Found specification of procedure P2 [2022-11-20 12:36:56,651 INFO L138 BoogieDeclarations]: Found implementation of procedure P2 [2022-11-20 12:36:56,651 INFO L130 BoogieDeclarations]: Found specification of procedure P3 [2022-11-20 12:36:56,651 INFO L138 BoogieDeclarations]: Found implementation of procedure P3 [2022-11-20 12:36:56,652 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-20 12:36:56,652 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_atomic_end [2022-11-20 12:36:56,652 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-20 12:36:56,652 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-20 12:36:56,654 WARN L209 CfgBuilder]: User set CodeBlockSize to SequenceOfStatements but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to SingleStatement [2022-11-20 12:36:56,938 INFO L235 CfgBuilder]: Building ICFG [2022-11-20 12:36:56,957 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-20 12:36:57,870 INFO L276 CfgBuilder]: Performing block encoding [2022-11-20 12:36:59,413 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-20 12:36:59,414 INFO L300 CfgBuilder]: Removed 0 assume(true) statements. [2022-11-20 12:36:59,417 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 12:36:59 BoogieIcfgContainer [2022-11-20 12:36:59,417 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-20 12:36:59,420 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-20 12:36:59,420 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-20 12:36:59,424 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-20 12:36:59,424 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.11 12:36:55" (1/3) ... [2022-11-20 12:36:59,425 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7051cf1b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 12:36:59, skipping insertion in model container [2022-11-20 12:36:59,425 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 12:36:56" (2/3) ... [2022-11-20 12:36:59,426 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7051cf1b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 12:36:59, skipping insertion in model container [2022-11-20 12:36:59,426 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 12:36:59" (3/3) ... [2022-11-20 12:36:59,427 INFO L112 eAbstractionObserver]: Analyzing ICFG safe016_power.opt.i [2022-11-20 12:36:59,451 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-20 12:36:59,451 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 64 error locations. [2022-11-20 12:36:59,451 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2022-11-20 12:36:59,646 INFO L144 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2022-11-20 12:36:59,686 INFO L115 etLargeBlockEncoding]: Petri net LBE is using semantic-based independence relation. [2022-11-20 12:36:59,704 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 228 places, 217 transitions, 454 flow [2022-11-20 12:36:59,707 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 228 places, 217 transitions, 454 flow [2022-11-20 12:36:59,710 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 228 places, 217 transitions, 454 flow [2022-11-20 12:36:59,827 INFO L130 PetriNetUnfolder]: 2/213 cut-off events. [2022-11-20 12:36:59,828 INFO L131 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2022-11-20 12:36:59,836 INFO L83 FinitePrefix]: Finished finitePrefix Result has 226 conditions, 213 events. 2/213 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 18. Compared 367 event pairs, 0 based on Foata normal form. 0/147 useless extension candidates. Maximal degree in co-relation 151. Up to 2 conditions per place. [2022-11-20 12:36:59,843 INFO L119 LiptonReduction]: Number of co-enabled transitions 11266 [2022-11-20 12:37:22,073 WARN L233 SmtUtils]: Spent 5.44s on a formula simplification. DAG size of input: 231 DAG size of output: 229 (called from [L 278] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaUtils.sequentialComposition) [2022-11-20 12:37:30,975 WARN L233 SmtUtils]: Spent 7.23s on a formula simplification. DAG size of input: 263 DAG size of output: 260 (called from [L 278] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaUtils.sequentialComposition) [2022-11-20 12:37:53,608 INFO L134 LiptonReduction]: Checked pairs total: 51488 [2022-11-20 12:37:53,608 INFO L136 LiptonReduction]: Total number of compositions: 198 [2022-11-20 12:37:53,618 INFO L113 iNet2FiniteAutomaton]: Start petriNet2FiniteAutomaton. Operand has 113 places, 101 transitions, 222 flow [2022-11-20 12:38:19,486 INFO L135 iNet2FiniteAutomaton]: Finished petriNet2FiniteAutomaton. Result has 630343 states, 520127 states have (on average 5.602783550940443) internal successors, (2914159), 630342 states have internal predecessors, (2914159), 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) [2022-11-20 12:38:19,515 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-20 12:38:19,522 INFO L357 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=false, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, 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, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@2abdcfc1, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-20 12:38:19,522 INFO L358 AbstractCegarLoop]: Starting to check reachability of 104 error locations. [2022-11-20 12:38:20,442 INFO L276 IsEmpty]: Start isEmpty. Operand has 630343 states, 520127 states have (on average 5.602783550940443) internal successors, (2914159), 630342 states have internal predecessors, (2914159), 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) [2022-11-20 12:38:20,448 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2 [2022-11-20 12:38:20,449 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 12:38:20,449 INFO L195 NwaCegarLoop]: trace histogram [1] [2022-11-20 12:38:20,450 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [P0Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, P0Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, P0Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 101 more)] === [2022-11-20 12:38:20,458 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 12:38:20,458 INFO L85 PathProgramCache]: Analyzing trace with hash 1468, now seen corresponding path program 1 times [2022-11-20 12:38:20,469 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-20 12:38:20,469 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1156745515] [2022-11-20 12:38:20,470 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 12:38:20,470 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 12:38:20,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 12:38:20,646 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 12:38:20,646 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-20 12:38:20,647 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1156745515] [2022-11-20 12:38:20,648 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1156745515] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 12:38:20,648 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 12:38:20,649 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [0] imperfect sequences [] total 0 [2022-11-20 12:38:20,650 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2137921266] [2022-11-20 12:38:20,651 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 12:38:20,657 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2022-11-20 12:38:20,658 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-20 12:38:20,689 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2022-11-20 12:38:20,690 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-20 12:38:21,919 INFO L87 Difference]: Start difference. First operand has 630343 states, 520127 states have (on average 5.602783550940443) internal successors, (2914159), 630342 states have internal predecessors, (2914159), 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 2 states, 1 states have (on average 1.0) internal successors, (1), 1 states have internal predecessors, (1), 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) [2022-11-20 12:38:29,104 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 12:38:29,104 INFO L93 Difference]: Finished difference Result 178219 states and 805045 transitions. [2022-11-20 12:38:29,107 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-11-20 12:38:29,108 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 1 states have (on average 1.0) internal successors, (1), 1 states have internal predecessors, (1), 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 1 [2022-11-20 12:38:29,109 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 12:38:31,382 INFO L225 Difference]: With dead ends: 178219 [2022-11-20 12:38:31,383 INFO L226 Difference]: Without dead ends: 178219 [2022-11-20 12:38:31,384 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 0 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-20 12:38:31,388 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 59 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 5 SdHoareTripleChecker+Invalid, 59 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 59 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-20 12:38:31,389 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 5 Invalid, 59 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 59 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-20 12:38:33,168 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178219 states. [2022-11-20 12:38:40,718 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178219 to 178219. [2022-11-20 12:38:41,059 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 178219 states, 159355 states have (on average 5.05189670860657) internal successors, (805045), 178218 states have internal predecessors, (805045), 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) [2022-11-20 12:38:43,564 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 178219 states to 178219 states and 805045 transitions. [2022-11-20 12:38:43,566 INFO L78 Accepts]: Start accepts. Automaton has 178219 states and 805045 transitions. Word has length 1 [2022-11-20 12:38:43,567 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 12:38:43,569 INFO L495 AbstractCegarLoop]: Abstraction has 178219 states and 805045 transitions. [2022-11-20 12:38:43,571 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 1 states have (on average 1.0) internal successors, (1), 1 states have internal predecessors, (1), 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) [2022-11-20 12:38:43,573 INFO L276 IsEmpty]: Start isEmpty. Operand 178219 states and 805045 transitions. [2022-11-20 12:38:43,574 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2022-11-20 12:38:43,574 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 12:38:43,575 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2022-11-20 12:38:43,575 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-20 12:38:43,575 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting P0Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [P0Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, P0Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, P0Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 101 more)] === [2022-11-20 12:38:43,576 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 12:38:43,577 INFO L85 PathProgramCache]: Analyzing trace with hash 44991196, now seen corresponding path program 1 times [2022-11-20 12:38:43,577 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-20 12:38:43,578 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1257164793] [2022-11-20 12:38:43,578 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 12:38:43,580 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 12:38:43,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 12:38:43,959 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 12:38:43,960 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-20 12:38:43,960 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1257164793] [2022-11-20 12:38:43,960 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1257164793] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 12:38:43,961 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 12:38:43,961 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2022-11-20 12:38:43,961 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [696850667] [2022-11-20 12:38:43,962 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 12:38:43,963 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-20 12:38:43,963 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-20 12:38:43,964 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-20 12:38:43,964 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-20 12:38:43,965 INFO L87 Difference]: Start difference. First operand 178219 states and 805045 transitions. Second operand has 3 states, 2 states have (on average 2.0) internal successors, (4), 2 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) [2022-11-20 12:38:46,356 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 12:38:46,356 INFO L93 Difference]: Finished difference Result 120686 states and 484344 transitions. [2022-11-20 12:38:46,356 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-20 12:38:46,357 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 2 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 [2022-11-20 12:38:46,357 INFO L84 Accepts]: Finished accepts. some prefix is accepted.