./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/seq-mthreaded/rekcba_aso.4.M1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 2329fc70 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_a8caa0c0-5fe2-4712-a566-0b65b0f8981c/bin/utaipan-gh47qXpMRh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a8caa0c0-5fe2-4712-a566-0b65b0f8981c/bin/utaipan-gh47qXpMRh/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a8caa0c0-5fe2-4712-a566-0b65b0f8981c/bin/utaipan-gh47qXpMRh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a8caa0c0-5fe2-4712-a566-0b65b0f8981c/bin/utaipan-gh47qXpMRh/config/TaipanReach.xml -i ../../sv-benchmarks/c/seq-mthreaded/rekcba_aso.4.M1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a8caa0c0-5fe2-4712-a566-0b65b0f8981c/bin/utaipan-gh47qXpMRh/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a8caa0c0-5fe2-4712-a566-0b65b0f8981c/bin/utaipan-gh47qXpMRh --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 8e24bd3d387a8dc9f49a28dec971e10112e01621b85a87c6eb3a0cec4db0bef2 --- 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-2329fc7 [2022-12-14 11:20:53,904 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-12-14 11:20:53,906 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-12-14 11:20:53,918 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-12-14 11:20:53,918 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-12-14 11:20:53,919 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-12-14 11:20:53,919 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-12-14 11:20:53,920 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-12-14 11:20:53,921 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-12-14 11:20:53,922 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-12-14 11:20:53,922 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-12-14 11:20:53,923 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-12-14 11:20:53,923 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-12-14 11:20:53,924 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-12-14 11:20:53,924 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-12-14 11:20:53,925 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-12-14 11:20:53,926 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-12-14 11:20:53,926 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-12-14 11:20:53,927 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-12-14 11:20:53,928 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-12-14 11:20:53,929 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-12-14 11:20:53,930 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-12-14 11:20:53,931 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-12-14 11:20:53,932 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-12-14 11:20:53,936 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-12-14 11:20:53,936 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-12-14 11:20:53,936 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-12-14 11:20:53,937 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-12-14 11:20:53,938 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-12-14 11:20:53,939 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-12-14 11:20:53,939 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-12-14 11:20:53,940 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-12-14 11:20:53,940 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-12-14 11:20:53,941 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-12-14 11:20:53,942 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-12-14 11:20:53,942 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-12-14 11:20:53,943 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-12-14 11:20:53,943 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-12-14 11:20:53,943 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-12-14 11:20:53,943 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-12-14 11:20:53,944 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-12-14 11:20:53,945 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a8caa0c0-5fe2-4712-a566-0b65b0f8981c/bin/utaipan-gh47qXpMRh/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-12-14 11:20:53,966 INFO L113 SettingsManager]: Loading preferences was successful [2022-12-14 11:20:53,966 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-12-14 11:20:53,966 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-12-14 11:20:53,966 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-12-14 11:20:53,967 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-12-14 11:20:53,967 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-12-14 11:20:53,967 INFO L138 SettingsManager]: * User list type=DISABLED [2022-12-14 11:20:53,968 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-12-14 11:20:53,968 INFO L138 SettingsManager]: * Explicit value domain=true [2022-12-14 11:20:53,968 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-12-14 11:20:53,968 INFO L138 SettingsManager]: * Octagon Domain=false [2022-12-14 11:20:53,968 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-12-14 11:20:53,968 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-12-14 11:20:53,968 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-12-14 11:20:53,969 INFO L138 SettingsManager]: * Interval Domain=false [2022-12-14 11:20:53,969 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-12-14 11:20:53,969 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-12-14 11:20:53,969 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-12-14 11:20:53,970 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-12-14 11:20:53,970 INFO L138 SettingsManager]: * sizeof long=4 [2022-12-14 11:20:53,970 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-12-14 11:20:53,970 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-12-14 11:20:53,970 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-12-14 11:20:53,970 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-12-14 11:20:53,970 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-12-14 11:20:53,970 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-12-14 11:20:53,971 INFO L138 SettingsManager]: * sizeof long double=12 [2022-12-14 11:20:53,971 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-12-14 11:20:53,971 INFO L138 SettingsManager]: * Use constant arrays=true [2022-12-14 11:20:53,971 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-12-14 11:20:53,971 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-12-14 11:20:53,972 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-12-14 11:20:53,972 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 11:20:53,972 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-12-14 11:20:53,972 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-12-14 11:20:53,972 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-12-14 11:20:53,972 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-12-14 11:20:53,972 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-12-14 11:20:53,973 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-12-14 11:20:53,973 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-12-14 11:20:53,973 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-12-14 11:20:53,973 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_a8caa0c0-5fe2-4712-a566-0b65b0f8981c/bin/utaipan-gh47qXpMRh/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a8caa0c0-5fe2-4712-a566-0b65b0f8981c/bin/utaipan-gh47qXpMRh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 8e24bd3d387a8dc9f49a28dec971e10112e01621b85a87c6eb3a0cec4db0bef2 [2022-12-14 11:20:54,163 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-12-14 11:20:54,178 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-12-14 11:20:54,180 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-12-14 11:20:54,181 INFO L271 PluginConnector]: Initializing CDTParser... [2022-12-14 11:20:54,182 INFO L275 PluginConnector]: CDTParser initialized [2022-12-14 11:20:54,183 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a8caa0c0-5fe2-4712-a566-0b65b0f8981c/bin/utaipan-gh47qXpMRh/../../sv-benchmarks/c/seq-mthreaded/rekcba_aso.4.M1.c [2022-12-14 11:20:56,805 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-12-14 11:20:57,009 INFO L351 CDTParser]: Found 1 translation units. [2022-12-14 11:20:57,009 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a8caa0c0-5fe2-4712-a566-0b65b0f8981c/sv-benchmarks/c/seq-mthreaded/rekcba_aso.4.M1.c [2022-12-14 11:20:57,024 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a8caa0c0-5fe2-4712-a566-0b65b0f8981c/bin/utaipan-gh47qXpMRh/data/0b6f9228b/bef846a85b08490e9243bcd3e934a6ea/FLAGb246a8ab0 [2022-12-14 11:20:57,034 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a8caa0c0-5fe2-4712-a566-0b65b0f8981c/bin/utaipan-gh47qXpMRh/data/0b6f9228b/bef846a85b08490e9243bcd3e934a6ea [2022-12-14 11:20:57,036 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-12-14 11:20:57,037 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-12-14 11:20:57,038 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-12-14 11:20:57,038 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-12-14 11:20:57,041 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-12-14 11:20:57,041 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 11:20:57" (1/1) ... [2022-12-14 11:20:57,042 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@496363d2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 11:20:57, skipping insertion in model container [2022-12-14 11:20:57,042 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 11:20:57" (1/1) ... [2022-12-14 11:20:57,047 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-12-14 11:20:57,093 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-12-14 11:20:57,220 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_a8caa0c0-5fe2-4712-a566-0b65b0f8981c/sv-benchmarks/c/seq-mthreaded/rekcba_aso.4.M1.c[2061,2074] [2022-12-14 11:20:57,272 WARN L623 FunctionHandler]: Unknown extern function nxt_motor_set_count [2022-12-14 11:20:57,272 WARN L623 FunctionHandler]: Unknown extern function nxt_motor_set_count [2022-12-14 11:20:57,274 WARN L623 FunctionHandler]: Unknown extern function ecrobot_sound_tone [2022-12-14 11:20:57,277 WARN L623 FunctionHandler]: Unknown extern function nxt_motor_set_speed [2022-12-14 11:20:57,277 WARN L623 FunctionHandler]: Unknown extern function nxt_motor_set_speed [2022-12-14 11:20:57,278 WARN L623 FunctionHandler]: Unknown extern function nxt_motor_set_speed [2022-12-14 11:20:57,278 WARN L623 FunctionHandler]: Unknown extern function nxt_motor_set_speed [2022-12-14 11:20:57,286 WARN L623 FunctionHandler]: Unknown extern function __startrek_get_pi_lock [2022-12-14 11:20:57,287 WARN L623 FunctionHandler]: Unknown extern function __startrek_release_pi_lock [2022-12-14 11:20:57,288 WARN L623 FunctionHandler]: Unknown extern function ecrobot_bt_data_logger [2022-12-14 11:20:57,461 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 11:20:57,472 INFO L203 MainTranslator]: Completed pre-run [2022-12-14 11:20:57,482 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_a8caa0c0-5fe2-4712-a566-0b65b0f8981c/sv-benchmarks/c/seq-mthreaded/rekcba_aso.4.M1.c[2061,2074] [2022-12-14 11:20:57,510 WARN L623 FunctionHandler]: Unknown extern function nxt_motor_set_count [2022-12-14 11:20:57,510 WARN L623 FunctionHandler]: Unknown extern function nxt_motor_set_count [2022-12-14 11:20:57,511 WARN L623 FunctionHandler]: Unknown extern function ecrobot_sound_tone [2022-12-14 11:20:57,513 WARN L623 FunctionHandler]: Unknown extern function nxt_motor_set_speed [2022-12-14 11:20:57,513 WARN L623 FunctionHandler]: Unknown extern function nxt_motor_set_speed [2022-12-14 11:20:57,514 WARN L623 FunctionHandler]: Unknown extern function nxt_motor_set_speed [2022-12-14 11:20:57,514 WARN L623 FunctionHandler]: Unknown extern function nxt_motor_set_speed [2022-12-14 11:20:57,517 WARN L623 FunctionHandler]: Unknown extern function __startrek_get_pi_lock [2022-12-14 11:20:57,518 WARN L623 FunctionHandler]: Unknown extern function __startrek_release_pi_lock [2022-12-14 11:20:57,519 WARN L623 FunctionHandler]: Unknown extern function ecrobot_bt_data_logger [2022-12-14 11:20:57,643 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 11:20:57,659 INFO L208 MainTranslator]: Completed translation [2022-12-14 11:20:57,659 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 11:20:57 WrapperNode [2022-12-14 11:20:57,660 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-12-14 11:20:57,660 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-12-14 11:20:57,660 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-12-14 11:20:57,660 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-12-14 11:20:57,666 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 11:20:57" (1/1) ... [2022-12-14 11:20:57,713 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 11:20:57" (1/1) ... [2022-12-14 11:20:57,884 INFO L138 Inliner]: procedures = 72, calls = 2680, calls flagged for inlining = 29, calls inlined = 29, statements flattened = 5657 [2022-12-14 11:20:57,884 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-12-14 11:20:57,885 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-12-14 11:20:57,885 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-12-14 11:20:57,885 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-12-14 11:20:57,894 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 11:20:57" (1/1) ... [2022-12-14 11:20:57,895 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 11:20:57" (1/1) ... [2022-12-14 11:20:57,918 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 11:20:57" (1/1) ... [2022-12-14 11:20:57,919 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 11:20:57" (1/1) ... [2022-12-14 11:20:57,986 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 11:20:57" (1/1) ... [2022-12-14 11:20:57,996 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 11:20:57" (1/1) ... [2022-12-14 11:20:58,004 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 11:20:57" (1/1) ... [2022-12-14 11:20:58,013 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 11:20:57" (1/1) ... [2022-12-14 11:20:58,028 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-12-14 11:20:58,029 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-12-14 11:20:58,029 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-12-14 11:20:58,029 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-12-14 11:20:58,030 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 11:20:57" (1/1) ... [2022-12-14 11:20:58,034 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 11:20:58,041 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a8caa0c0-5fe2-4712-a566-0b65b0f8981c/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 11:20:58,052 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a8caa0c0-5fe2-4712-a566-0b65b0f8981c/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-12-14 11:20:58,054 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a8caa0c0-5fe2-4712-a566-0b65b0f8981c/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-12-14 11:20:58,086 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-12-14 11:20:58,087 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_read_cmd_forward [2022-12-14 11:20:58,087 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_read_cmd_forward [2022-12-14 11:20:58,087 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_cs_t2 [2022-12-14 11:20:58,087 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_cs_t2 [2022-12-14 11:20:58,087 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_write_nxtway_gs_mode [2022-12-14 11:20:58,087 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_write_nxtway_gs_mode [2022-12-14 11:20:58,087 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-12-14 11:20:58,087 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_cs_t0 [2022-12-14 11:20:58,087 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_cs_t0 [2022-12-14 11:20:58,088 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_cs_t1 [2022-12-14 11:20:58,088 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_cs_t1 [2022-12-14 11:20:58,088 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_read___startrek_current_priority [2022-12-14 11:20:58,088 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_read___startrek_current_priority [2022-12-14 11:20:58,088 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_write_obstacle_flag [2022-12-14 11:20:58,088 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_write_obstacle_flag [2022-12-14 11:20:58,088 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-12-14 11:20:58,088 INFO L130 BoogieDeclarations]: Found specification of procedure nxt_motor_set_count [2022-12-14 11:20:58,088 INFO L138 BoogieDeclarations]: Found implementation of procedure nxt_motor_set_count [2022-12-14 11:20:58,088 INFO L130 BoogieDeclarations]: Found specification of procedure ecrobot_get_gyro_sensor [2022-12-14 11:20:58,088 INFO L138 BoogieDeclarations]: Found implementation of procedure ecrobot_get_gyro_sensor [2022-12-14 11:20:58,088 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_write_cmd_turn [2022-12-14 11:20:58,088 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_write_cmd_turn [2022-12-14 11:20:58,088 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_write___startrek_current_priority [2022-12-14 11:20:58,089 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_write___startrek_current_priority [2022-12-14 11:20:58,089 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_entry_pt_OSEK_Task_ts1 [2022-12-14 11:20:58,089 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_entry_pt_OSEK_Task_ts1 [2022-12-14 11:20:58,089 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_entry_pt_OSEK_Task_ts2 [2022-12-14 11:20:58,089 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_entry_pt_OSEK_Task_ts2 [2022-12-14 11:20:58,089 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_entry_pt_OSEK_Task_ts3 [2022-12-14 11:20:58,089 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_entry_pt_OSEK_Task_ts3 [2022-12-14 11:20:58,089 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-12-14 11:20:58,089 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-12-14 11:20:58,089 INFO L130 BoogieDeclarations]: Found specification of procedure assert [2022-12-14 11:20:58,089 INFO L138 BoogieDeclarations]: Found implementation of procedure assert [2022-12-14 11:20:58,089 INFO L130 BoogieDeclarations]: Found specification of procedure nxt_motor_set_speed [2022-12-14 11:20:58,089 INFO L138 BoogieDeclarations]: Found implementation of procedure nxt_motor_set_speed [2022-12-14 11:20:58,089 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_write_cmd_forward [2022-12-14 11:20:58,090 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_write_cmd_forward [2022-12-14 11:20:58,090 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_read_obstacle_flag [2022-12-14 11:20:58,090 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_read_obstacle_flag [2022-12-14 11:20:58,090 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-12-14 11:20:58,090 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-12-14 11:20:58,090 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-12-14 11:20:58,090 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-12-14 11:20:58,090 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-12-14 11:20:58,090 INFO L130 BoogieDeclarations]: Found specification of procedure ecrobot_get_systick_ms [2022-12-14 11:20:58,090 INFO L138 BoogieDeclarations]: Found implementation of procedure ecrobot_get_systick_ms [2022-12-14 11:20:58,090 INFO L130 BoogieDeclarations]: Found specification of procedure nxt_motor_get_count [2022-12-14 11:20:58,090 INFO L138 BoogieDeclarations]: Found implementation of procedure nxt_motor_get_count [2022-12-14 11:20:58,090 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_read_nxtway_gs_mode [2022-12-14 11:20:58,090 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_read_nxtway_gs_mode [2022-12-14 11:20:58,090 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_read_cmd_turn [2022-12-14 11:20:58,090 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_read_cmd_turn [2022-12-14 11:20:58,447 INFO L235 CfgBuilder]: Building ICFG [2022-12-14 11:20:58,448 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-12-14 11:21:06,991 INFO L276 CfgBuilder]: Performing block encoding [2022-12-14 11:21:07,351 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-12-14 11:21:07,351 INFO L300 CfgBuilder]: Removed 1 assume(true) statements. [2022-12-14 11:21:07,355 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 11:21:07 BoogieIcfgContainer [2022-12-14 11:21:07,355 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-12-14 11:21:07,357 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-12-14 11:21:07,357 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-12-14 11:21:07,360 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-12-14 11:21:07,360 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.12 11:20:57" (1/3) ... [2022-12-14 11:21:07,361 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@19a25fdd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 11:21:07, skipping insertion in model container [2022-12-14 11:21:07,361 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 11:20:57" (2/3) ... [2022-12-14 11:21:07,361 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@19a25fdd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 11:21:07, skipping insertion in model container [2022-12-14 11:21:07,361 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 11:21:07" (3/3) ... [2022-12-14 11:21:07,362 INFO L112 eAbstractionObserver]: Analyzing ICFG rekcba_aso.4.M1.c [2022-12-14 11:21:07,377 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-12-14 11:21:07,377 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-12-14 11:21:07,454 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-12-14 11:21:07,460 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=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@10f5eeb7, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-12-14 11:21:07,461 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-12-14 11:21:07,470 INFO L276 IsEmpty]: Start isEmpty. Operand has 1576 states, 956 states have (on average 1.25836820083682) internal successors, (1203), 987 states have internal predecessors, (1203), 595 states have call successors, (595), 23 states have call predecessors, (595), 23 states have return successors, (595), 593 states have call predecessors, (595), 595 states have call successors, (595) [2022-12-14 11:21:07,546 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1172 [2022-12-14 11:21:07,547 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 11:21:07,548 INFO L195 NwaCegarLoop]: trace histogram [241, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 11:21:07,549 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 11:21:07,554 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 11:21:07,554 INFO L85 PathProgramCache]: Analyzing trace with hash 1968552564, now seen corresponding path program 1 times [2022-12-14 11:21:07,563 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 11:21:07,564 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [77517745] [2022-12-14 11:21:07,564 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 11:21:07,565 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms