./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/ddv-machzwd/ddv_machzwd_all.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version dbf71c69 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_315971a2-c3f6-4136-9d1e-cdf40277ac65/bin/ukojak-92XMlrwhuB/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_315971a2-c3f6-4136-9d1e-cdf40277ac65/bin/ukojak-92XMlrwhuB/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_315971a2-c3f6-4136-9d1e-cdf40277ac65/bin/ukojak-92XMlrwhuB/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_315971a2-c3f6-4136-9d1e-cdf40277ac65/bin/ukojak-92XMlrwhuB/config/KojakMemDerefMemtrack.xml -i ../../sv-benchmarks/c/ddv-machzwd/ddv_machzwd_all.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_315971a2-c3f6-4136-9d1e-cdf40277ac65/bin/ukojak-92XMlrwhuB/config/svcomp-DerefFreeMemtrack-32bit-Kojak_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_315971a2-c3f6-4136-9d1e-cdf40277ac65/bin/ukojak-92XMlrwhuB --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 Kojak --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash a564ea576763c13bfd3673da7d9fb82b1799f9ec9208539e745949eb812373cd --- 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-dbf71c6-m [2022-10-17 16:47:24,192 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-10-17 16:47:24,194 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-10-17 16:47:24,226 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-10-17 16:47:24,227 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-10-17 16:47:24,228 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-10-17 16:47:24,231 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-10-17 16:47:24,236 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-10-17 16:47:24,243 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-10-17 16:47:24,244 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-10-17 16:47:24,245 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-10-17 16:47:24,246 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-10-17 16:47:24,247 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-10-17 16:47:24,248 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-10-17 16:47:24,250 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-10-17 16:47:24,252 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-10-17 16:47:24,253 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-10-17 16:47:24,254 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-10-17 16:47:24,257 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-10-17 16:47:24,260 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-10-17 16:47:24,262 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-10-17 16:47:24,263 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-10-17 16:47:24,265 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-10-17 16:47:24,266 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-10-17 16:47:24,271 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-10-17 16:47:24,272 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-10-17 16:47:24,272 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-10-17 16:47:24,274 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-10-17 16:47:24,274 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-10-17 16:47:24,276 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-10-17 16:47:24,276 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-10-17 16:47:24,277 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-10-17 16:47:24,278 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-10-17 16:47:24,279 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-10-17 16:47:24,281 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-10-17 16:47:24,281 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-10-17 16:47:24,282 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-10-17 16:47:24,282 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-10-17 16:47:24,282 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-10-17 16:47:24,283 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-10-17 16:47:24,284 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-10-17 16:47:24,285 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_315971a2-c3f6-4136-9d1e-cdf40277ac65/bin/ukojak-92XMlrwhuB/config/svcomp-DerefFreeMemtrack-32bit-Kojak_Default.epf [2022-10-17 16:47:24,340 INFO L113 SettingsManager]: Loading preferences was successful [2022-10-17 16:47:24,354 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-10-17 16:47:24,356 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-10-17 16:47:24,357 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-10-17 16:47:24,357 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-10-17 16:47:24,357 INFO L138 SettingsManager]: * sizeof long=4 [2022-10-17 16:47:24,357 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2022-10-17 16:47:24,358 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-10-17 16:47:24,358 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-10-17 16:47:24,358 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-10-17 16:47:24,359 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2022-10-17 16:47:24,359 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2022-10-17 16:47:24,360 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2022-10-17 16:47:24,360 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-10-17 16:47:24,360 INFO L138 SettingsManager]: * sizeof long double=12 [2022-10-17 16:47:24,360 INFO L138 SettingsManager]: * Use constant arrays=true [2022-10-17 16:47:24,360 INFO L136 SettingsManager]: Preferences of CodeCheck differ from their defaults: [2022-10-17 16:47:24,361 INFO L138 SettingsManager]: * Timeout in seconds=1000000 [2022-10-17 16:47:24,361 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-10-17 16:47:24,361 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:10000 [2022-10-17 16:47:24,361 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-10-17 16:47:24,362 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-10-17 16:47:24,362 INFO L138 SettingsManager]: * Trace refinement strategy=PENGUIN [2022-10-17 16:47:24,362 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-10-17 16:47:24,362 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_315971a2-c3f6-4136-9d1e-cdf40277ac65/bin/ukojak-92XMlrwhuB/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_315971a2-c3f6-4136-9d1e-cdf40277ac65/bin/ukojak-92XMlrwhuB Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Kojak Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> a564ea576763c13bfd3673da7d9fb82b1799f9ec9208539e745949eb812373cd [2022-10-17 16:47:24,612 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-10-17 16:47:24,647 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-10-17 16:47:24,651 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-10-17 16:47:24,652 INFO L271 PluginConnector]: Initializing CDTParser... [2022-10-17 16:47:24,653 INFO L275 PluginConnector]: CDTParser initialized [2022-10-17 16:47:24,655 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_315971a2-c3f6-4136-9d1e-cdf40277ac65/bin/ukojak-92XMlrwhuB/../../sv-benchmarks/c/ddv-machzwd/ddv_machzwd_all.i [2022-10-17 16:47:24,716 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_315971a2-c3f6-4136-9d1e-cdf40277ac65/bin/ukojak-92XMlrwhuB/data/b5186d393/f0d1f2b4d2504a7595f1bafb70f60cd7/FLAG25f2cb2da [2022-10-17 16:47:25,493 INFO L306 CDTParser]: Found 1 translation units. [2022-10-17 16:47:25,494 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_315971a2-c3f6-4136-9d1e-cdf40277ac65/sv-benchmarks/c/ddv-machzwd/ddv_machzwd_all.i [2022-10-17 16:47:25,526 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_315971a2-c3f6-4136-9d1e-cdf40277ac65/bin/ukojak-92XMlrwhuB/data/b5186d393/f0d1f2b4d2504a7595f1bafb70f60cd7/FLAG25f2cb2da [2022-10-17 16:47:25,542 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_315971a2-c3f6-4136-9d1e-cdf40277ac65/bin/ukojak-92XMlrwhuB/data/b5186d393/f0d1f2b4d2504a7595f1bafb70f60cd7 [2022-10-17 16:47:25,544 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-10-17 16:47:25,546 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-10-17 16:47:25,548 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-10-17 16:47:25,548 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-10-17 16:47:25,551 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-10-17 16:47:25,552 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 17.10 04:47:25" (1/1) ... [2022-10-17 16:47:25,553 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3039d8dc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 04:47:25, skipping insertion in model container [2022-10-17 16:47:25,553 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 17.10 04:47:25" (1/1) ... [2022-10-17 16:47:25,561 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-10-17 16:47:25,632 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-10-17 16:47:25,851 WARN L230 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_315971a2-c3f6-4136-9d1e-cdf40277ac65/sv-benchmarks/c/ddv-machzwd/ddv_machzwd_all.i[452,465] [2022-10-17 16:47:27,084 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-10-17 16:47:27,114 INFO L203 MainTranslator]: Completed pre-run [2022-10-17 16:47:27,126 WARN L230 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_315971a2-c3f6-4136-9d1e-cdf40277ac65/sv-benchmarks/c/ddv-machzwd/ddv_machzwd_all.i[452,465] [2022-10-17 16:47:27,325 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-10-17 16:47:27,491 INFO L208 MainTranslator]: Completed translation [2022-10-17 16:47:27,492 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 04:47:27 WrapperNode [2022-10-17 16:47:27,492 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-10-17 16:47:27,493 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-10-17 16:47:27,494 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-10-17 16:47:27,494 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-10-17 16:47:27,502 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 04:47:27" (1/1) ... [2022-10-17 16:47:27,581 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 04:47:27" (1/1) ... [2022-10-17 16:47:27,751 INFO L138 Inliner]: procedures = 476, calls = 866, calls flagged for inlining = 215, calls inlined = 308, statements flattened = 2373 [2022-10-17 16:47:27,752 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-10-17 16:47:27,754 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-10-17 16:47:27,754 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-10-17 16:47:27,755 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-10-17 16:47:27,764 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 04:47:27" (1/1) ... [2022-10-17 16:47:27,765 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 04:47:27" (1/1) ... [2022-10-17 16:47:27,790 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 04:47:27" (1/1) ... [2022-10-17 16:47:27,790 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 04:47:27" (1/1) ... [2022-10-17 16:47:27,877 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 04:47:27" (1/1) ... [2022-10-17 16:47:27,909 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 04:47:27" (1/1) ... [2022-10-17 16:47:27,918 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 04:47:27" (1/1) ... [2022-10-17 16:47:27,943 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 04:47:27" (1/1) ... [2022-10-17 16:47:27,967 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-10-17 16:47:27,968 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-10-17 16:47:27,969 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-10-17 16:47:27,969 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-10-17 16:47:27,970 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 04:47:27" (1/1) ... [2022-10-17 16:47:27,976 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:10000 [2022-10-17 16:47:27,987 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_315971a2-c3f6-4136-9d1e-cdf40277ac65/bin/ukojak-92XMlrwhuB/z3 [2022-10-17 16:47:27,999 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_315971a2-c3f6-4136-9d1e-cdf40277ac65/bin/ukojak-92XMlrwhuB/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:10000 (exit command is (exit), workingDir is null) [2022-10-17 16:47:28,036 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_315971a2-c3f6-4136-9d1e-cdf40277ac65/bin/ukojak-92XMlrwhuB/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:10000 (1)] Waiting until timeout for monitored process [2022-10-17 16:47:28,047 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-10-17 16:47:28,047 INFO L130 BoogieDeclarations]: Found specification of procedure write~unchecked~int [2022-10-17 16:47:28,048 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-10-17 16:47:28,049 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2022-10-17 16:47:28,049 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-10-17 16:47:28,049 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2022-10-17 16:47:28,050 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-10-17 16:47:28,050 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-10-17 16:47:28,050 INFO L130 BoogieDeclarations]: Found specification of procedure write~unchecked~$Pointer$ [2022-10-17 16:47:28,050 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-10-17 16:47:28,050 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2022-10-17 16:47:28,051 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2022-10-17 16:47:28,051 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-10-17 16:47:28,051 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-10-17 16:47:28,424 INFO L235 CfgBuilder]: Building ICFG [2022-10-17 16:47:28,426 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-10-17 16:47:31,612 INFO L276 CfgBuilder]: Performing block encoding [2022-10-17 16:47:32,382 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-10-17 16:47:32,382 INFO L300 CfgBuilder]: Removed 5 assume(true) statements. [2022-10-17 16:47:32,387 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 17.10 04:47:32 BoogieIcfgContainer [2022-10-17 16:47:32,387 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-10-17 16:47:32,388 INFO L113 PluginConnector]: ------------------------CodeCheck---------------------------- [2022-10-17 16:47:32,388 INFO L271 PluginConnector]: Initializing CodeCheck... [2022-10-17 16:47:32,399 INFO L275 PluginConnector]: CodeCheck initialized [2022-10-17 16:47:32,400 INFO L185 PluginConnector]: Executing the observer CodeCheckObserver from plugin CodeCheck for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 17.10 04:47:32" (1/1) ... [2022-10-17 16:47:32,409 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 16:47:32,470 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2022-10-17 16:47:32,483 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 927 states to 792 states and 927 transitions. [2022-10-17 16:47:32,484 INFO L276 IsEmpty]: Start isEmpty. Operand 792 states and 927 transitions. [2022-10-17 16:47:32,486 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3 [2022-10-17 16:47:32,486 INFO L422 CodeCheckObserver]: Error Path is FOUND. [2022-10-17 16:47:32,487 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 16:47:32,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 16:47:33,202 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-10-17 16:47:34,166 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2022-10-17 16:47:34,168 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 926 states to 791 states and 926 transitions. [2022-10-17 16:47:34,168 INFO L276 IsEmpty]: Start isEmpty. Operand 791 states and 926 transitions. [2022-10-17 16:47:34,169 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3 [2022-10-17 16:47:34,169 INFO L422 CodeCheckObserver]: Error Path is FOUND. [2022-10-17 16:47:34,169 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 16:47:34,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 16:47:34,681 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-10-17 16:47:35,758 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2022-10-17 16:47:35,761 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 925 states to 790 states and 925 transitions. [2022-10-17 16:47:35,761 INFO L276 IsEmpty]: Start isEmpty. Operand 790 states and 925 transitions. [2022-10-17 16:47:35,762 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2022-10-17 16:47:35,762 INFO L422 CodeCheckObserver]: Error Path is FOUND. [2022-10-17 16:47:35,762 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 16:47:35,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 16:47:35,922 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-10-17 16:47:35,955 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2022-10-17 16:47:35,957 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 924 states to 789 states and 924 transitions. [2022-10-17 16:47:35,957 INFO L276 IsEmpty]: Start isEmpty. Operand 789 states and 924 transitions. [2022-10-17 16:47:35,957 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2022-10-17 16:47:35,958 INFO L422 CodeCheckObserver]: Error Path is FOUND. [2022-10-17 16:47:35,958 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 16:47:36,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 16:47:36,544 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-10-17 16:47:36,651 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2022-10-17 16:47:36,653 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 923 states to 788 states and 923 transitions. [2022-10-17 16:47:36,653 INFO L276 IsEmpty]: Start isEmpty. Operand 788 states and 923 transitions. [2022-10-17 16:47:36,654 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2022-10-17 16:47:36,654 INFO L422 CodeCheckObserver]: Error Path is FOUND. [2022-10-17 16:47:36,654 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 16:47:36,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 16:47:36,872 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-10-17 16:47:37,959 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2022-10-17 16:47:37,961 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 922 states to 787 states and 922 transitions. [2022-10-17 16:47:37,962 INFO L276 IsEmpty]: Start isEmpty. Operand 787 states and 922 transitions. [2022-10-17 16:47:37,962 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2022-10-17 16:47:37,962 INFO L422 CodeCheckObserver]: Error Path is FOUND. [2022-10-17 16:47:37,962 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 16:47:38,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 16:47:38,383 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-10-17 16:47:39,699 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.19s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-10-17 16:47:40,132 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2022-10-17 16:47:40,134 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 924 states to 789 states and 924 transitions. [2022-10-17 16:47:40,135 INFO L276 IsEmpty]: Start isEmpty. Operand 789 states and 924 transitions. [2022-10-17 16:47:40,135 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-10-17 16:47:40,135 INFO L422 CodeCheckObserver]: Error Path is FOUND. [2022-10-17 16:47:40,135 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 16:47:40,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 16:47:40,591 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-10-17 16:47:41,052 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2022-10-17 16:47:41,054 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 923 states to 788 states and 923 transitions. [2022-10-17 16:47:41,054 INFO L276 IsEmpty]: Start isEmpty. Operand 788 states and 923 transitions. [2022-10-17 16:47:41,055 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2022-10-17 16:47:41,055 INFO L422 CodeCheckObserver]: Error Path is FOUND. [2022-10-17 16:47:41,055 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 16:47:41,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 16:47:41,282 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-10-17 16:47:41,544 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2022-10-17 16:47:41,546 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 924 states to 789 states and 924 transitions. [2022-10-17 16:47:41,546 INFO L276 IsEmpty]: Start isEmpty. Operand 789 states and 924 transitions. [2022-10-17 16:47:41,547 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-10-17 16:47:41,547 INFO L422 CodeCheckObserver]: Error Path is FOUND. [2022-10-17 16:47:41,547 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 16:47:41,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 16:47:41,883 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-10-17 16:47:44,240 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2022-10-17 16:47:44,242 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 929 states to 791 states and 929 transitions. [2022-10-17 16:47:44,242 INFO L276 IsEmpty]: Start isEmpty. Operand 791 states and 929 transitions. [2022-10-17 16:47:44,245 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-10-17 16:47:44,245 INFO L422 CodeCheckObserver]: Error Path is FOUND. [2022-10-17 16:47:44,245 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 16:47:44,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 16:47:44,471 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-10-17 16:47:44,957 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2022-10-17 16:47:44,964 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 931 states to 793 states and 931 transitions. [2022-10-17 16:47:44,964 INFO L276 IsEmpty]: Start isEmpty. Operand 793 states and 931 transitions. [2022-10-17 16:47:44,965 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-10-17 16:47:44,965 INFO L422 CodeCheckObserver]: Error Path is FOUND. [2022-10-17 16:47:44,965 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 16:47:45,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 16:47:45,211 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-10-17 16:47:45,727 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2022-10-17 16:47:45,729 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 933 states to 795 states and 933 transitions. [2022-10-17 16:47:45,729 INFO L276 IsEmpty]: Start isEmpty. Operand 795 states and 933 transitions. [2022-10-17 16:47:45,730 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-10-17 16:47:45,730 INFO L422 CodeCheckObserver]: Error Path is FOUND. [2022-10-17 16:47:45,731 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 16:47:45,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 16:47:46,220 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-10-17 16:47:47,546 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.02s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-10-17 16:47:50,226 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2022-10-17 16:47:50,228 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 935 states to 797 states and 935 transitions. [2022-10-17 16:47:50,228 INFO L276 IsEmpty]: Start isEmpty. Operand 797 states and 935 transitions. [2022-10-17 16:47:50,229 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-10-17 16:47:50,229 INFO L422 CodeCheckObserver]: Error Path is FOUND. [2022-10-17 16:47:50,229 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 16:47:50,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 16:47:50,406 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-10-17 16:47:50,496 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2022-10-17 16:47:50,498 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 934 states to 796 states and 934 transitions. [2022-10-17 16:47:50,499 INFO L276 IsEmpty]: Start isEmpty. Operand 796 states and 934 transitions. [2022-10-17 16:47:50,499 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-10-17 16:47:50,499 INFO L422 CodeCheckObserver]: Error Path is FOUND. [2022-10-17 16:47:50,499 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 16:47:50,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 16:47:51,113 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-10-17 16:47:51,381 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2022-10-17 16:47:51,384 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 937 states to 797 states and 937 transitions. [2022-10-17 16:47:51,384 INFO L276 IsEmpty]: Start isEmpty. Operand 797 states and 937 transitions. [2022-10-17 16:47:51,385 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-10-17 16:47:51,385 INFO L422 CodeCheckObserver]: Error Path is FOUND. [2022-10-17 16:47:51,385 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 16:47:51,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 16:47:51,553 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-10-17 16:47:51,729 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2022-10-17 16:47:51,731 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 936 states to 796 states and 936 transitions. [2022-10-17 16:47:51,732 INFO L276 IsEmpty]: Start isEmpty. Operand 796 states and 936 transitions. [2022-10-17 16:47:51,733 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-10-17 16:47:51,734 INFO L422 CodeCheckObserver]: Error Path is FOUND. [2022-10-17 16:47:51,735 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 16:47:51,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 16:47:52,063 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-10-17 16:47:52,412 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2022-10-17 16:47:52,414 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 937 states to 797 states and 937 transitions. [2022-10-17 16:47:52,414 INFO L276 IsEmpty]: Start isEmpty. Operand 797 states and 937 transitions. [2022-10-17 16:47:52,415 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-10-17 16:47:52,415 INFO L422 CodeCheckObserver]: Error Path is FOUND. [2022-10-17 16:47:52,416 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 16:47:52,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 16:47:52,596 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-10-17 16:47:52,844 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2022-10-17 16:47:52,848 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 926 states to 791 states and 926 transitions. [2022-10-17 16:47:52,848 INFO L276 IsEmpty]: Start isEmpty. Operand 791 states and 926 transitions. [2022-10-17 16:47:52,849 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2022-10-17 16:47:52,850 INFO L422 CodeCheckObserver]: Error Path is FOUND. [2022-10-17 16:47:52,850 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 16:47:52,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 16:47:53,252 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-10-17 16:47:54,097 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2022-10-17 16:47:54,099 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 927 states to 793 states and 927 transitions. [2022-10-17 16:47:54,100 INFO L276 IsEmpty]: Start isEmpty. Operand 793 states and 927 transitions. [2022-10-17 16:47:54,101 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-10-17 16:47:54,101 INFO L422 CodeCheckObserver]: Error Path is FOUND. [2022-10-17 16:47:54,103 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 16:47:54,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 16:47:54,491 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked.