./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/loop-invgen/apache-get-tag.i.p+nlh-reducer.c --full-output --witness-type correctness_witness --validate ../results/automizer-verification-files/SV-COMP24_unreach-call/apache-get-tag.i.p+nlh-reducer.yml/witness-2.1.yml --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version ca4ee3dd Calling Ultimate with: /root/.sdkman/candidates/java/current/bin/java -Dosgi.configuration.area=/storage/repos/certificate-witnesses-artifact/referee/data/config -Xmx15G -Xms4m -jar /storage/repos/certificate-witnesses-artifact/referee/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /storage/repos/certificate-witnesses-artifact/referee/data -tc /storage/repos/certificate-witnesses-artifact/referee/config/RefereeReachWitnessValidation.xml -i ../sv-benchmarks/c/loop-invgen/apache-get-tag.i.p+nlh-reducer.c ../results/automizer-verification-files/SV-COMP24_unreach-call/apache-get-tag.i.p+nlh-reducer.yml/witness-2.1.yml -s /storage/repos/certificate-witnesses-artifact/referee/config/svcomp-Reach-32bit-Referee_Default.epf --cacsl2boogietranslator.entry.function main --traceabstraction.positions.where.we.compute.the.hoare.annotation None --- Real Ultimate output --- This is Ultimate 0.2.4-tmp.dk.referee-eval-ca4ee3d-m [2024-09-20 20:08:50,439 INFO L188 SettingsManager]: Resetting all preferences to default values... [2024-09-20 20:08:50,502 INFO L114 SettingsManager]: Loading settings from /storage/repos/certificate-witnesses-artifact/referee/config/svcomp-Reach-32bit-Referee_Default.epf [2024-09-20 20:08:50,507 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2024-09-20 20:08:50,507 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2024-09-20 20:08:50,533 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2024-09-20 20:08:50,534 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2024-09-20 20:08:50,534 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2024-09-20 20:08:50,535 INFO L151 SettingsManager]: Preferences of Boogie Preprocessor differ from their defaults: [2024-09-20 20:08:50,536 INFO L153 SettingsManager]: * Use memory slicer=true [2024-09-20 20:08:50,536 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2024-09-20 20:08:50,536 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2024-09-20 20:08:50,537 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2024-09-20 20:08:50,537 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2024-09-20 20:08:50,538 INFO L153 SettingsManager]: * Use SBE=true [2024-09-20 20:08:50,539 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2024-09-20 20:08:50,539 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2024-09-20 20:08:50,539 INFO L153 SettingsManager]: * sizeof long=4 [2024-09-20 20:08:50,539 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2024-09-20 20:08:50,539 INFO L153 SettingsManager]: * sizeof POINTER=4 [2024-09-20 20:08:50,540 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2024-09-20 20:08:50,545 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2024-09-20 20:08:50,545 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2024-09-20 20:08:50,546 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2024-09-20 20:08:50,546 INFO L153 SettingsManager]: * Allow undefined functions=false [2024-09-20 20:08:50,546 INFO L153 SettingsManager]: * sizeof long double=12 [2024-09-20 20:08:50,546 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2024-09-20 20:08:50,546 INFO L153 SettingsManager]: * Use constant arrays=true [2024-09-20 20:08:50,546 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2024-09-20 20:08:50,547 INFO L153 SettingsManager]: * Size of a code block=SequenceOfStatements [2024-09-20 20:08:50,547 INFO L153 SettingsManager]: * Future-live optimization=false [2024-09-20 20:08:50,547 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2024-09-20 20:08:50,547 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2024-09-20 20:08:50,547 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 [2024-09-20 20:08:50,547 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2024-09-20 20:08:50,547 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2024-09-20 20:08:50,548 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2024-09-20 20:08:50,548 INFO L153 SettingsManager]: * Trace refinement strategy=CAMEL [2024-09-20 20:08:50,548 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2024-09-20 20:08:50,548 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2024-09-20 20:08:50,548 INFO L153 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2024-09-20 20:08:50,549 INFO L153 SettingsManager]: * Order on configurations for Petri net unfoldings=DBO [2024-09-20 20:08:50,549 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2024-09-20 20:08:50,549 INFO L153 SettingsManager]: * Looper check in Petri net analysis=SEMANTIC WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/certificate-witnesses-artifact/referee/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Positions where we compute the Hoare Annotation -> None [2024-09-20 20:08:50,735 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2024-09-20 20:08:50,755 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2024-09-20 20:08:50,758 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2024-09-20 20:08:50,759 INFO L270 PluginConnector]: Initializing CDTParser... [2024-09-20 20:08:50,759 INFO L274 PluginConnector]: CDTParser initialized [2024-09-20 20:08:50,761 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/certificate-witnesses-artifact/referee/../sv-benchmarks/c/loop-invgen/apache-get-tag.i.p+nlh-reducer.c [2024-09-20 20:08:52,873 INFO L533 CDTParser]: Created temporary CDT project at NULL [2024-09-20 20:08:53,097 INFO L384 CDTParser]: Found 1 translation units. [2024-09-20 20:08:53,098 INFO L180 CDTParser]: Scanning /storage/repos/certificate-witnesses-artifact/sv-benchmarks/c/loop-invgen/apache-get-tag.i.p+nlh-reducer.c [2024-09-20 20:08:53,119 INFO L427 CDTParser]: About to delete temporary CDT project at /storage/repos/certificate-witnesses-artifact/referee/data/fd8d5d103/217dd9b25d6a466bbee8d9e572c9d9c0/FLAG456c5d8bc [2024-09-20 20:08:53,144 INFO L435 CDTParser]: Successfully deleted /storage/repos/certificate-witnesses-artifact/referee/data/fd8d5d103/217dd9b25d6a466bbee8d9e572c9d9c0 [2024-09-20 20:08:53,147 INFO L270 PluginConnector]: Initializing Witness Parser... [2024-09-20 20:08:53,150 INFO L274 PluginConnector]: Witness Parser initialized [2024-09-20 20:08:53,151 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/certificate-witnesses-artifact/referee/../results/automizer-verification-files/SV-COMP24_unreach-call/apache-get-tag.i.p+nlh-reducer.yml/witness-2.1.yml [2024-09-20 20:08:53,209 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2024-09-20 20:08:53,210 INFO L133 ToolchainWalker]: Walking toolchain with 4 elements. [2024-09-20 20:08:53,212 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2024-09-20 20:08:53,213 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2024-09-20 20:08:53,216 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2024-09-20 20:08:53,217 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.09 08:08:53" (1/2) ... [2024-09-20 20:08:53,218 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6093197f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 08:08:53, skipping insertion in model container [2024-09-20 20:08:53,218 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.09 08:08:53" (1/2) ... [2024-09-20 20:08:53,220 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.CACSL2BoogieTranslatorObserver@1bab0824 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 08:08:53, skipping insertion in model container [2024-09-20 20:08:53,237 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "witness-2.1.yml de.uni_freiburg.informatik.ultimate.witnessparser CORRECTNESS_WITNESS 20.09 08:08:53" (2/2) ... [2024-09-20 20:08:53,238 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6093197f and model type witness-2.1.yml de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator CORRECTNESS_WITNESS 20.09 08:08:53, skipping insertion in model container [2024-09-20 20:08:53,238 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "witness-2.1.yml de.uni_freiburg.informatik.ultimate.witnessparser CORRECTNESS_WITNESS 20.09 08:08:53" (2/2) ... [2024-09-20 20:08:53,269 INFO L93 nessWitnessExtractor]: Found the following entries in the witness: [2024-09-20 20:08:53,270 INFO L1541 ArrayList]: Location invariant before [L64-L3001] (((main__t == 0) || (1 <= main__t)) && (((long long) main__t + 1) <= main__tagbuf_len)) [2024-09-20 20:08:53,270 INFO L1541 ArrayList]: Location invariant before [L132-L282] ((((long long) main__t + 1) <= main__tagbuf_len) && (1 <= main__t)) [2024-09-20 20:08:53,270 INFO L1541 ArrayList]: Location invariant before [L2591-L2647] ((59 <= main__t) && (((long long) main__t + 1) <= main__tagbuf_len)) [2024-09-20 20:08:53,270 INFO L1541 ArrayList]: Location invariant before [L25-L3002] ((0 <= main__t) && (main__t <= main__tagbuf_len)) [2024-09-20 20:08:53,270 INFO L1541 ArrayList]: Location invariant before [L96-L283] ((1 <= main__t) && (main__t <= main__tagbuf_len)) [2024-09-20 20:08:53,328 INFO L175 MainTranslator]: Built tables and reachable declarations [2024-09-20 20:08:53,480 WARN L248 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/certificate-witnesses-artifact/sv-benchmarks/c/loop-invgen/apache-get-tag.i.p+nlh-reducer.c[901,914] [2024-09-20 20:08:53,485 WARN L248 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/certificate-witnesses-artifact/sv-benchmarks/c/loop-invgen/apache-get-tag.i.p+nlh-reducer.c[1116,1129] [2024-09-20 20:08:53,491 WARN L248 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/certificate-witnesses-artifact/sv-benchmarks/c/loop-invgen/apache-get-tag.i.p+nlh-reducer.c[1625,1638] [2024-09-20 20:08:53,492 WARN L248 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/certificate-witnesses-artifact/sv-benchmarks/c/loop-invgen/apache-get-tag.i.p+nlh-reducer.c[1840,1853] [2024-09-20 20:08:53,494 WARN L248 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/certificate-witnesses-artifact/sv-benchmarks/c/loop-invgen/apache-get-tag.i.p+nlh-reducer.c[2157,2170] [2024-09-20 20:08:53,494 WARN L248 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/certificate-witnesses-artifact/sv-benchmarks/c/loop-invgen/apache-get-tag.i.p+nlh-reducer.c[2372,2385] [2024-09-20 20:08:53,497 WARN L248 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/certificate-witnesses-artifact/sv-benchmarks/c/loop-invgen/apache-get-tag.i.p+nlh-reducer.c[2867,2880] [2024-09-20 20:08:53,502 WARN L248 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/certificate-witnesses-artifact/sv-benchmarks/c/loop-invgen/apache-get-tag.i.p+nlh-reducer.c[3082,3095] [2024-09-20 20:08:53,503 WARN L248 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/certificate-witnesses-artifact/sv-benchmarks/c/loop-invgen/apache-get-tag.i.p+nlh-reducer.c[3384,3397] [2024-09-20 20:08:53,506 WARN L248 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/certificate-witnesses-artifact/sv-benchmarks/c/loop-invgen/apache-get-tag.i.p+nlh-reducer.c[3602,3615] [2024-09-20 20:08:53,509 WARN L248 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/certificate-witnesses-artifact/sv-benchmarks/c/loop-invgen/apache-get-tag.i.p+nlh-reducer.c[3878,3891] [2024-09-20 20:08:53,510 WARN L248 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/certificate-witnesses-artifact/sv-benchmarks/c/loop-invgen/apache-get-tag.i.p+nlh-reducer.c[4096,4109] [2024-09-20 20:08:53,511 WARN L248 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/certificate-witnesses-artifact/sv-benchmarks/c/loop-invgen/apache-get-tag.i.p+nlh-reducer.c[4582,4595] [2024-09-20 20:08:53,512 WARN L248 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/certificate-witnesses-artifact/sv-benchmarks/c/loop-invgen/apache-get-tag.i.p+nlh-reducer.c[4800,4813] [2024-09-20 20:08:53,654 WARN L248 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/certificate-witnesses-artifact/sv-benchmarks/c/loop-invgen/apache-get-tag.i.p+nlh-reducer.c[47686,47699] [2024-09-20 20:08:53,662 WARN L248 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/certificate-witnesses-artifact/sv-benchmarks/c/loop-invgen/apache-get-tag.i.p+nlh-reducer.c[47907,47920] [2024-09-20 20:08:53,679 INFO L210 PostProcessor]: Analyzing one entry point: main [2024-09-20 20:08:53,695 INFO L200 MainTranslator]: Completed pre-run [2024-09-20 20:08:53,712 WARN L248 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/certificate-witnesses-artifact/sv-benchmarks/c/loop-invgen/apache-get-tag.i.p+nlh-reducer.c[901,914] [2024-09-20 20:08:53,717 WARN L248 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/certificate-witnesses-artifact/sv-benchmarks/c/loop-invgen/apache-get-tag.i.p+nlh-reducer.c[1116,1129] [2024-09-20 20:08:53,720 WARN L248 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/certificate-witnesses-artifact/sv-benchmarks/c/loop-invgen/apache-get-tag.i.p+nlh-reducer.c[1625,1638] [2024-09-20 20:08:53,726 WARN L248 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/certificate-witnesses-artifact/sv-benchmarks/c/loop-invgen/apache-get-tag.i.p+nlh-reducer.c[1840,1853] [2024-09-20 20:08:53,728 WARN L248 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/certificate-witnesses-artifact/sv-benchmarks/c/loop-invgen/apache-get-tag.i.p+nlh-reducer.c[2157,2170] [2024-09-20 20:08:53,728 WARN L248 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/certificate-witnesses-artifact/sv-benchmarks/c/loop-invgen/apache-get-tag.i.p+nlh-reducer.c[2372,2385] [2024-09-20 20:08:53,729 WARN L248 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/certificate-witnesses-artifact/sv-benchmarks/c/loop-invgen/apache-get-tag.i.p+nlh-reducer.c[2867,2880] [2024-09-20 20:08:53,730 WARN L248 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/certificate-witnesses-artifact/sv-benchmarks/c/loop-invgen/apache-get-tag.i.p+nlh-reducer.c[3082,3095] [2024-09-20 20:08:53,735 WARN L248 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/certificate-witnesses-artifact/sv-benchmarks/c/loop-invgen/apache-get-tag.i.p+nlh-reducer.c[3384,3397] [2024-09-20 20:08:53,736 WARN L248 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/certificate-witnesses-artifact/sv-benchmarks/c/loop-invgen/apache-get-tag.i.p+nlh-reducer.c[3602,3615] [2024-09-20 20:08:53,736 WARN L248 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/certificate-witnesses-artifact/sv-benchmarks/c/loop-invgen/apache-get-tag.i.p+nlh-reducer.c[3878,3891] [2024-09-20 20:08:53,737 WARN L248 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/certificate-witnesses-artifact/sv-benchmarks/c/loop-invgen/apache-get-tag.i.p+nlh-reducer.c[4096,4109] [2024-09-20 20:08:53,738 WARN L248 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/certificate-witnesses-artifact/sv-benchmarks/c/loop-invgen/apache-get-tag.i.p+nlh-reducer.c[4582,4595] [2024-09-20 20:08:53,743 WARN L248 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/certificate-witnesses-artifact/sv-benchmarks/c/loop-invgen/apache-get-tag.i.p+nlh-reducer.c[4800,4813] Start Parsing Local Start Parsing Local [2024-09-20 20:08:53,917 WARN L248 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/certificate-witnesses-artifact/sv-benchmarks/c/loop-invgen/apache-get-tag.i.p+nlh-reducer.c[47686,47699] [2024-09-20 20:08:53,928 WARN L248 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/certificate-witnesses-artifact/sv-benchmarks/c/loop-invgen/apache-get-tag.i.p+nlh-reducer.c[47907,47920] Start Parsing Local Start Parsing Local Start Parsing Local [2024-09-20 20:08:53,959 INFO L210 PostProcessor]: Analyzing one entry point: main [2024-09-20 20:08:53,984 INFO L204 MainTranslator]: Completed translation [2024-09-20 20:08:53,987 INFO L201 PluginConnector]: Adding new model witness-2.1.yml de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator CORRECTNESS_WITNESS 20.09 08:08:53 WrapperNode [2024-09-20 20:08:53,989 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2024-09-20 20:08:53,990 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2024-09-20 20:08:53,994 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2024-09-20 20:08:53,994 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2024-09-20 20:08:54,015 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "witness-2.1.yml de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator CORRECTNESS_WITNESS 20.09 08:08:53" (1/1) ... [2024-09-20 20:08:54,018 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "witness-2.1.yml de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator CORRECTNESS_WITNESS 20.09 08:08:53" (1/1) ... [2024-09-20 20:08:54,054 INFO L184 PluginConnector]: Executing the observer MemorySlicer from plugin Boogie Preprocessor for "witness-2.1.yml de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator CORRECTNESS_WITNESS 20.09 08:08:53" (1/1) ... [2024-09-20 20:08:54,121 INFO L175 MemorySlicer]: Split 2 memory accesses to 1 slices as follows [2]. 100 percent of accesses are in the largest equivalence class. The 2 initializations are split as follows [2]. The 0 writes are split as follows [0]. [2024-09-20 20:08:54,122 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "witness-2.1.yml de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator CORRECTNESS_WITNESS 20.09 08:08:53" (1/1) ... [2024-09-20 20:08:54,123 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "witness-2.1.yml de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator CORRECTNESS_WITNESS 20.09 08:08:53" (1/1) ... [2024-09-20 20:08:54,163 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "witness-2.1.yml de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator CORRECTNESS_WITNESS 20.09 08:08:53" (1/1) ... [2024-09-20 20:08:54,190 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "witness-2.1.yml de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator CORRECTNESS_WITNESS 20.09 08:08:53" (1/1) ... [2024-09-20 20:08:54,193 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "witness-2.1.yml de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator CORRECTNESS_WITNESS 20.09 08:08:53" (1/1) ... [2024-09-20 20:08:54,209 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "witness-2.1.yml de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator CORRECTNESS_WITNESS 20.09 08:08:53" (1/1) ... [2024-09-20 20:08:54,222 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2024-09-20 20:08:54,227 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2024-09-20 20:08:54,228 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2024-09-20 20:08:54,229 INFO L274 PluginConnector]: RCFGBuilder initialized [2024-09-20 20:08:54,229 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "witness-2.1.yml de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator CORRECTNESS_WITNESS 20.09 08:08:53" (1/1) ... [2024-09-20 20:08:54,238 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 [2024-09-20 20:08:54,253 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/certificate-witnesses-artifact/referee/z3 [2024-09-20 20:08:54,276 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/certificate-witnesses-artifact/referee/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 (exit command is (exit), workingDir is null) [2024-09-20 20:08:54,279 INFO L327 MonitoredProcess]: [MP /storage/repos/certificate-witnesses-artifact/referee/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 (1)] Waiting until timeout for monitored process [2024-09-20 20:08:54,318 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2024-09-20 20:08:54,318 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2024-09-20 20:08:54,319 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2024-09-20 20:08:54,319 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2024-09-20 20:08:54,319 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2024-09-20 20:08:54,319 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2024-09-20 20:08:54,319 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2024-09-20 20:08:54,319 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2024-09-20 20:08:54,319 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2024-09-20 20:08:54,319 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2024-09-20 20:08:54,319 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2024-09-20 20:08:54,320 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2024-09-20 20:08:54,320 INFO L130 BoogieDeclarations]: Found specification of procedure main [2024-09-20 20:08:54,320 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2024-09-20 20:08:54,320 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#0 [2024-09-20 20:08:54,320 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2024-09-20 20:08:54,320 INFO L130 BoogieDeclarations]: Found specification of procedure write~int#0 [2024-09-20 20:08:54,320 INFO L130 BoogieDeclarations]: Found specification of procedure read~int#0 [2024-09-20 20:08:54,320 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2024-09-20 20:08:54,456 INFO L242 CfgBuilder]: Building ICFG [2024-09-20 20:08:54,457 INFO L268 CfgBuilder]: Building CFG for each procedure with an implementation [2024-09-20 20:08:55,200 INFO L291 CfgBuilder]: Performing block encoding [2024-09-20 20:08:55,242 INFO L313 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2024-09-20 20:08:55,244 INFO L318 CfgBuilder]: Removed 0 assume(true) statements. [2024-09-20 20:08:55,245 INFO L201 PluginConnector]: Adding new model witness-2.1.yml de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.09 08:08:55 BoogieIcfgContainer [2024-09-20 20:08:55,245 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2024-09-20 20:08:55,246 INFO L112 PluginConnector]: ------------------------Referee---------------------------- [2024-09-20 20:08:55,246 INFO L270 PluginConnector]: Initializing Referee... [2024-09-20 20:08:55,246 INFO L274 PluginConnector]: Referee initialized [2024-09-20 20:08:55,247 INFO L184 PluginConnector]: Executing the observer RefereeObserver from plugin Referee for "CDTParser AST 20.09 08:08:53" (1/4) ... [2024-09-20 20:08:55,247 INFO L204 PluginConnector]: Invalid model from Referee for observer de.uni_freiburg.informatik.ultimate.plugins.generator.referee.RefereeObserver@59245065 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.referee AST 20.09 08:08:55, skipping insertion in model container [2024-09-20 20:08:55,247 INFO L184 PluginConnector]: Executing the observer RefereeObserver from plugin Referee for "witness-2.1.yml de.uni_freiburg.informatik.ultimate.witnessparser CORRECTNESS_WITNESS 20.09 08:08:53" (2/4) ... [2024-09-20 20:08:55,248 INFO L204 PluginConnector]: Invalid model from Referee for observer de.uni_freiburg.informatik.ultimate.plugins.generator.referee.RefereeObserver@59245065 and model type witness-2.1.yml de.uni_freiburg.informatik.ultimate.plugins.generator.referee CORRECTNESS_WITNESS 20.09 08:08:55, skipping insertion in model container [2024-09-20 20:08:55,248 INFO L184 PluginConnector]: Executing the observer RefereeObserver from plugin Referee for "witness-2.1.yml de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator CORRECTNESS_WITNESS 20.09 08:08:53" (3/4) ... [2024-09-20 20:08:55,248 INFO L204 PluginConnector]: Invalid model from Referee for observer de.uni_freiburg.informatik.ultimate.plugins.generator.referee.RefereeObserver@59245065 and model type witness-2.1.yml de.uni_freiburg.informatik.ultimate.plugins.generator.referee CORRECTNESS_WITNESS 20.09 08:08:55, skipping insertion in model container [2024-09-20 20:08:55,249 INFO L184 PluginConnector]: Executing the observer RefereeObserver from plugin Referee for "witness-2.1.yml de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.09 08:08:55" (4/4) ... [2024-09-20 20:08:55,250 INFO L79 RefereeObserver]: Analyzing ICFG apache-get-tag.i.p+nlh-reducer.c [2024-09-20 20:08:55,253 INFO L113 InvariantChecker]: Found 0 loops. [2024-09-20 20:08:55,255 INFO L373 InvariantChecker]: Will check inductivity from ENTRY $Ultimate##0 to ERROR_LOC mainErr9ASSERT_VIOLATIONWITNESS_INVARIANT. Corresponding subgraph has 328 edges. [2024-09-20 20:08:55,255 INFO L373 InvariantChecker]: Will check inductivity from ENTRY $Ultimate##0 to ERROR_LOC mainErr13ASSERT_VIOLATIONERROR_FUNCTION. Corresponding subgraph has 331 edges. [2024-09-20 20:08:55,256 INFO L373 InvariantChecker]: Will check inductivity from ENTRY $Ultimate##0 to ERROR_LOC mainErr3ASSERT_VIOLATIONWITNESS_INVARIANT. Corresponding subgraph has 5 edges. [2024-09-20 20:08:55,257 INFO L373 InvariantChecker]: Will check inductivity from ENTRY $Ultimate##0 to ERROR_LOC mainErr2ASSERT_VIOLATIONERROR_FUNCTION. Corresponding subgraph has 314 edges. [2024-09-20 20:08:55,257 INFO L373 InvariantChecker]: Will check inductivity from ENTRY $Ultimate##0 to ERROR_LOC mainErr12ASSERT_VIOLATIONERROR_FUNCTION. Corresponding subgraph has 330 edges. [2024-09-20 20:08:55,257 INFO L373 InvariantChecker]: Will check inductivity from ENTRY $Ultimate##0 to ERROR_LOC mainErr6ASSERT_VIOLATIONWITNESS_INVARIANT. Corresponding subgraph has 328 edges. [2024-09-20 20:08:55,258 INFO L373 InvariantChecker]: Will check inductivity from ENTRY $Ultimate##0 to ERROR_LOC mainErr16ASSERT_VIOLATIONERROR_FUNCTION. Corresponding subgraph has 330 edges. [2024-09-20 20:08:55,258 INFO L373 InvariantChecker]: Will check inductivity from ENTRY $Ultimate##0 to ERROR_LOC mainErr5ASSERT_VIOLATIONERROR_FUNCTION. Corresponding subgraph has 314 edges. [2024-09-20 20:08:55,258 INFO L373 InvariantChecker]: Will check inductivity from ENTRY $Ultimate##0 to ERROR_LOC mainErr19ASSERT_VIOLATIONERROR_FUNCTION. Corresponding subgraph has 251 edges. [2024-09-20 20:08:55,259 INFO L373 InvariantChecker]: Will check inductivity from ENTRY $Ultimate##0 to ERROR_LOC mainErr7ASSERT_VIOLATIONERROR_FUNCTION. Corresponding subgraph has 330 edges. [2024-09-20 20:08:55,260 INFO L373 InvariantChecker]: Will check inductivity from ENTRY $Ultimate##0 to ERROR_LOC mainErr1ASSERT_VIOLATIONERROR_FUNCTION. Corresponding subgraph has 313 edges. [2024-09-20 20:08:55,260 INFO L373 InvariantChecker]: Will check inductivity from ENTRY $Ultimate##0 to ERROR_LOC mainErr11ASSERT_VIOLATIONERROR_FUNCTION. Corresponding subgraph has 329 edges. [2024-09-20 20:08:55,261 INFO L373 InvariantChecker]: Will check inductivity from ENTRY $Ultimate##0 to ERROR_LOC mainErr14ASSERT_VIOLATIONERROR_FUNCTION. Corresponding subgraph has 329 edges. [2024-09-20 20:08:55,261 INFO L373 InvariantChecker]: Will check inductivity from ENTRY $Ultimate##0 to ERROR_LOC mainErr8ASSERT_VIOLATIONERROR_FUNCTION. Corresponding subgraph has 331 edges. [2024-09-20 20:08:55,261 INFO L373 InvariantChecker]: Will check inductivity from ENTRY $Ultimate##0 to ERROR_LOC mainErr18ASSERT_VIOLATIONWITNESS_INVARIANT. Corresponding subgraph has 243 edges. [2024-09-20 20:08:55,262 INFO L373 InvariantChecker]: Will check inductivity from ENTRY $Ultimate##0 to ERROR_LOC mainErr15ASSERT_VIOLATIONERROR_FUNCTION. Corresponding subgraph has 329 edges. [2024-09-20 20:08:55,262 INFO L373 InvariantChecker]: Will check inductivity from ENTRY $Ultimate##0 to ERROR_LOC mainErr20ASSERT_VIOLATIONERROR_FUNCTION. Corresponding subgraph has 251 edges. [2024-09-20 20:08:55,262 INFO L373 InvariantChecker]: Will check inductivity from ENTRY $Ultimate##0 to ERROR_LOC mainErr0ASSERT_VIOLATIONWITNESS_INVARIANT. Corresponding subgraph has 3 edges. [2024-09-20 20:08:55,264 INFO L373 InvariantChecker]: Will check inductivity from ENTRY $Ultimate##0 to ERROR_LOC mainErr17ASSERT_VIOLATIONERROR_FUNCTION. Corresponding subgraph has 331 edges. [2024-09-20 20:08:55,264 INFO L373 InvariantChecker]: Will check inductivity from ENTRY $Ultimate##0 to ERROR_LOC mainErr4ASSERT_VIOLATIONERROR_FUNCTION. Corresponding subgraph has 313 edges. [2024-09-20 20:08:55,265 INFO L373 InvariantChecker]: Will check inductivity from ENTRY $Ultimate##0 to ERROR_LOC mainErr10ASSERT_VIOLATIONERROR_FUNCTION. Corresponding subgraph has 329 edges. [2024-09-20 20:08:55,265 INFO L131 InvariantChecker]: Will check 21 loop-free subgraphs from procedure entry to error location [2024-09-20 20:08:55,380 INFO L314 BlockEncoder]: Initial Icfg 265 locations, 328 edges [2024-09-20 20:08:55,381 INFO L264 BlockEncoder]: Using Maximize final states [2024-09-20 20:08:55,381 INFO L271 BlockEncoder]: Using Minimize states even if more edges are added than removed.=true [2024-09-20 20:08:55,382 INFO L277 BlockEncoder]: Using Minimize states using LBE with the strategy=MULTI [2024-09-20 20:08:55,382 INFO L172 BlockEncoder]: Using Apply optimizations until nothing changes=true [2024-09-20 20:08:55,385 INFO L71 MaximizeFinalStates]: 0 new accepting states [2024-09-20 20:09:01,081 INFO L101 BaseMinimizeStates]: Removed 1283 edges and 261 locations by large block encoding [2024-09-20 20:09:01,084 INFO L71 MaximizeFinalStates]: 0 new accepting states [2024-09-20 20:09:01,085 INFO L101 BaseMinimizeStates]: Removed 0 edges and 0 locations by large block encoding [2024-09-20 20:09:01,085 INFO L238 BlockEncoder]: Using Create parallel compositions if possible [2024-09-20 20:09:01,086 INFO L68 ParallelComposer]: Creating parallel compositions [2024-09-20 20:09:02,111 INFO L314 BlockEncoder]: Encoded RCFG 4 locations, 8 edges [2024-09-20 20:09:02,114 FATAL L? ?]: The Plugin de.uni_freiburg.informatik.ultimate.plugins.generator.referee has thrown an exception: java.lang.AssertionError: Either subgraph not acyclic or there is a bug at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AcyclicSubgraphMerger.(AcyclicSubgraphMerger.java:169) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.InvariantChecker.(InvariantChecker.java:145) at de.uni_freiburg.informatik.ultimate.plugins.generator.referee.RefereeStarter.(RefereeStarter.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.referee.RefereeObserver.finish(RefereeObserver.java:80) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2024-09-20 20:09:02,119 INFO L158 Benchmark]: Toolchain (without parser) took 8906.71ms. Allocated memory was 167.8MB in the beginning and 6.4GB in the end (delta: 6.2GB). Free memory was 85.2MB in the beginning and 5.9GB in the end (delta: -5.8GB). Peak memory consumption was 478.6MB. Max. memory is 16.1GB. [2024-09-20 20:09:02,120 INFO L158 Benchmark]: CDTParser took 0.19ms. Allocated memory is still 167.8MB. Free memory was 120.8MB in the beginning and 120.6MB in the end (delta: 243.3kB). There was no memory consumed. Max. memory is 16.1GB. [2024-09-20 20:09:02,120 INFO L158 Benchmark]: Witness Parser took 0.11ms. Allocated memory is still 167.8MB. Free memory is still 87.0MB. There was no memory consumed. Max. memory is 16.1GB. [2024-09-20 20:09:02,120 INFO L158 Benchmark]: CACSL2BoogieTranslator took 777.12ms. Allocated memory was 167.8MB in the beginning and 249.6MB in the end (delta: 81.8MB). Free memory was 84.9MB in the beginning and 173.8MB in the end (delta: -88.8MB). Peak memory consumption was 9.2MB. Max. memory is 16.1GB. [2024-09-20 20:09:02,121 INFO L158 Benchmark]: Boogie Preprocessor took 235.94ms. Allocated memory is still 249.6MB. Free memory was 173.8MB in the beginning and 165.4MB in the end (delta: 8.4MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. [2024-09-20 20:09:02,121 INFO L158 Benchmark]: RCFGBuilder took 1018.44ms. Allocated memory is still 249.6MB. Free memory was 165.4MB in the beginning and 191.3MB in the end (delta: -25.9MB). Peak memory consumption was 99.9MB. Max. memory is 16.1GB. [2024-09-20 20:09:02,122 INFO L158 Benchmark]: Referee took 6870.82ms. Allocated memory was 249.6MB in the beginning and 6.4GB in the end (delta: 6.1GB). Free memory was 191.3MB in the beginning and 5.9GB in the end (delta: -5.7GB). Peak memory consumption was 501.6MB. Max. memory is 16.1GB. [2024-09-20 20:09:02,124 INFO L338 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.referee: - ExceptionOrErrorResult: AssertionError: Either subgraph not acyclic or there is a bug de.uni_freiburg.informatik.ultimate.plugins.generator.referee: AssertionError: Either subgraph not acyclic or there is a bug: de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AcyclicSubgraphMerger.(AcyclicSubgraphMerger.java:169) * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.19ms. Allocated memory is still 167.8MB. Free memory was 120.8MB in the beginning and 120.6MB in the end (delta: 243.3kB). There was no memory consumed. Max. memory is 16.1GB. * Witness Parser took 0.11ms. Allocated memory is still 167.8MB. Free memory is still 87.0MB. There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 777.12ms. Allocated memory was 167.8MB in the beginning and 249.6MB in the end (delta: 81.8MB). Free memory was 84.9MB in the beginning and 173.8MB in the end (delta: -88.8MB). Peak memory consumption was 9.2MB. Max. memory is 16.1GB. * Boogie Preprocessor took 235.94ms. Allocated memory is still 249.6MB. Free memory was 173.8MB in the beginning and 165.4MB in the end (delta: 8.4MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. * RCFGBuilder took 1018.44ms. Allocated memory is still 249.6MB. Free memory was 165.4MB in the beginning and 191.3MB in the end (delta: -25.9MB). Peak memory consumption was 99.9MB. Max. memory is 16.1GB. * Referee took 6870.82ms. Allocated memory was 249.6MB in the beginning and 6.4GB in the end (delta: 6.1GB). Free memory was 191.3MB in the beginning and 5.9GB in the end (delta: -5.7GB). Peak memory consumption was 501.6MB. Max. memory is 16.1GB. RESULT: Ultimate could not prove your program: Toolchain returned no result. [2024-09-20 20:09:02,172 INFO L552 MonitoredProcess]: [MP /storage/repos/certificate-witnesses-artifact/referee/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 (1)] Ended with exit code 0 Received shutdown request... --- End real Ultimate output --- Execution finished normally Using bit-precise analysis Retrying with bit-precise analysis ### Bit-precise run ### Calling Ultimate with: /root/.sdkman/candidates/java/current/bin/java -Dosgi.configuration.area=/storage/repos/certificate-witnesses-artifact/referee/data/config -Xmx15G -Xms4m -jar /storage/repos/certificate-witnesses-artifact/referee/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /storage/repos/certificate-witnesses-artifact/referee/data -tc /storage/repos/certificate-witnesses-artifact/referee/config/RefereeReachWitnessValidation.xml -i ../sv-benchmarks/c/loop-invgen/apache-get-tag.i.p+nlh-reducer.c ../results/automizer-verification-files/SV-COMP24_unreach-call/apache-get-tag.i.p+nlh-reducer.yml/witness-2.1.yml -s /storage/repos/certificate-witnesses-artifact/referee/config/svcomp-Reach-32bit-Referee_Bitvector.epf --cacsl2boogietranslator.entry.function main --traceabstraction.positions.where.we.compute.the.hoare.annotation None --- Real Ultimate output --- This is Ultimate 0.2.4-tmp.dk.referee-eval-ca4ee3d-m [2024-09-20 20:09:04,535 INFO L188 SettingsManager]: Resetting all preferences to default values... [2024-09-20 20:09:04,604 INFO L114 SettingsManager]: Loading settings from /storage/repos/certificate-witnesses-artifact/referee/config/svcomp-Reach-32bit-Referee_Bitvector.epf [2024-09-20 20:09:04,609 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2024-09-20 20:09:04,610 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2024-09-20 20:09:04,633 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2024-09-20 20:09:04,634 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2024-09-20 20:09:04,635 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2024-09-20 20:09:04,635 INFO L151 SettingsManager]: Preferences of Boogie Preprocessor differ from their defaults: [2024-09-20 20:09:04,638 INFO L153 SettingsManager]: * Use memory slicer=true [2024-09-20 20:09:04,638 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2024-09-20 20:09:04,638 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2024-09-20 20:09:04,639 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2024-09-20 20:09:04,639 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2024-09-20 20:09:04,639 INFO L153 SettingsManager]: * Use SBE=true [2024-09-20 20:09:04,639 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2024-09-20 20:09:04,639 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2024-09-20 20:09:04,640 INFO L153 SettingsManager]: * sizeof long=4 [2024-09-20 20:09:04,640 INFO L153 SettingsManager]: * sizeof POINTER=4 [2024-09-20 20:09:04,640 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2024-09-20 20:09:04,642 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2024-09-20 20:09:04,643 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2024-09-20 20:09:04,643 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2024-09-20 20:09:04,643 INFO L153 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2024-09-20 20:09:04,643 INFO L153 SettingsManager]: * Use bitvectors instead of ints=true [2024-09-20 20:09:04,643 INFO L153 SettingsManager]: * Allow undefined functions=false [2024-09-20 20:09:04,643 INFO L153 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2024-09-20 20:09:04,644 INFO L153 SettingsManager]: * sizeof long double=12 [2024-09-20 20:09:04,644 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2024-09-20 20:09:04,644 INFO L153 SettingsManager]: * Use constant arrays=true [2024-09-20 20:09:04,644 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2024-09-20 20:09:04,644 INFO L153 SettingsManager]: * Size of a code block=SequenceOfStatements [2024-09-20 20:09:04,644 INFO L153 SettingsManager]: * Future-live optimization=false [2024-09-20 20:09:04,644 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2024-09-20 20:09:04,645 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2024-09-20 20:09:04,645 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 [2024-09-20 20:09:04,645 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2024-09-20 20:09:04,645 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2024-09-20 20:09:04,645 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2024-09-20 20:09:04,645 INFO L153 SettingsManager]: * Trace refinement strategy=WOLF [2024-09-20 20:09:04,646 INFO L153 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2024-09-20 20:09:04,647 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2024-09-20 20:09:04,648 INFO L153 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2024-09-20 20:09:04,648 INFO L153 SettingsManager]: * Order on configurations for Petri net unfoldings=DBO [2024-09-20 20:09:04,648 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2024-09-20 20:09:04,648 INFO L153 SettingsManager]: * Logic for external solver=AUFBV [2024-09-20 20:09:04,648 INFO L153 SettingsManager]: * Looper check in Petri net analysis=SEMANTIC WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/certificate-witnesses-artifact/referee/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Positions where we compute the Hoare Annotation -> None [2024-09-20 20:09:04,909 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2024-09-20 20:09:04,931 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2024-09-20 20:09:04,934 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2024-09-20 20:09:04,935 INFO L270 PluginConnector]: Initializing CDTParser... [2024-09-20 20:09:04,935 INFO L274 PluginConnector]: CDTParser initialized [2024-09-20 20:09:04,937 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/certificate-witnesses-artifact/referee/../sv-benchmarks/c/loop-invgen/apache-get-tag.i.p+nlh-reducer.c [2024-09-20 20:09:06,533 INFO L533 CDTParser]: Created temporary CDT project at NULL [2024-09-20 20:09:06,944 INFO L384 CDTParser]: Found 1 translation units. [2024-09-20 20:09:06,948 INFO L180 CDTParser]: Scanning /storage/repos/certificate-witnesses-artifact/sv-benchmarks/c/loop-invgen/apache-get-tag.i.p+nlh-reducer.c [2024-09-20 20:09:06,975 INFO L427 CDTParser]: About to delete temporary CDT project at /storage/repos/certificate-witnesses-artifact/referee/data/e18cf83c3/933df51d33114186900efcfe92f49f48/FLAG637249166 [2024-09-20 20:09:07,006 INFO L435 CDTParser]: Successfully deleted /storage/repos/certificate-witnesses-artifact/referee/data/e18cf83c3/933df51d33114186900efcfe92f49f48 [2024-09-20 20:09:07,009 INFO L270 PluginConnector]: Initializing Witness Parser... [2024-09-20 20:09:07,016 INFO L274 PluginConnector]: Witness Parser initialized [2024-09-20 20:09:07,017 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/certificate-witnesses-artifact/referee/../results/automizer-verification-files/SV-COMP24_unreach-call/apache-get-tag.i.p+nlh-reducer.yml/witness-2.1.yml [2024-09-20 20:09:07,105 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2024-09-20 20:09:07,106 INFO L133 ToolchainWalker]: Walking toolchain with 4 elements. [2024-09-20 20:09:07,110 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2024-09-20 20:09:07,111 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2024-09-20 20:09:07,120 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2024-09-20 20:09:07,120 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.09 08:09:07" (1/2) ... [2024-09-20 20:09:07,128 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7679573c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 08:09:07, skipping insertion in model container [2024-09-20 20:09:07,128 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.09 08:09:07" (1/2) ... [2024-09-20 20:09:07,130 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.CACSL2BoogieTranslatorObserver@66c97032 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 08:09:07, skipping insertion in model container [2024-09-20 20:09:07,130 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "witness-2.1.yml de.uni_freiburg.informatik.ultimate.witnessparser CORRECTNESS_WITNESS 20.09 08:09:07" (2/2) ... [2024-09-20 20:09:07,130 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7679573c and model type witness-2.1.yml de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator CORRECTNESS_WITNESS 20.09 08:09:07, skipping insertion in model container [2024-09-20 20:09:07,131 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "witness-2.1.yml de.uni_freiburg.informatik.ultimate.witnessparser CORRECTNESS_WITNESS 20.09 08:09:07" (2/2) ... [2024-09-20 20:09:07,190 INFO L93 nessWitnessExtractor]: Found the following entries in the witness: [2024-09-20 20:09:07,190 INFO L1541 ArrayList]: Location invariant before [L64-L3001] (((main__t == 0) || (1 <= main__t)) && (((long long) main__t + 1) <= main__tagbuf_len)) [2024-09-20 20:09:07,190 INFO L1541 ArrayList]: Location invariant before [L2591-L2647] ((59 <= main__t) && (((long long) main__t + 1) <= main__tagbuf_len)) [2024-09-20 20:09:07,191 INFO L1541 ArrayList]: Location invariant before [L132-L282] ((((long long) main__t + 1) <= main__tagbuf_len) && (1 <= main__t)) [2024-09-20 20:09:07,191 INFO L1541 ArrayList]: Location invariant before [L96-L283] ((1 <= main__t) && (main__t <= main__tagbuf_len)) [2024-09-20 20:09:07,191 INFO L1541 ArrayList]: Location invariant before [L25-L3002] ((0 <= main__t) && (main__t <= main__tagbuf_len)) [2024-09-20 20:09:07,240 INFO L175 MainTranslator]: Built tables and reachable declarations [2024-09-20 20:09:07,415 WARN L248 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/certificate-witnesses-artifact/sv-benchmarks/c/loop-invgen/apache-get-tag.i.p+nlh-reducer.c[901,914] [2024-09-20 20:09:07,421 WARN L248 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/certificate-witnesses-artifact/sv-benchmarks/c/loop-invgen/apache-get-tag.i.p+nlh-reducer.c[1116,1129] [2024-09-20 20:09:07,423 WARN L248 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/certificate-witnesses-artifact/sv-benchmarks/c/loop-invgen/apache-get-tag.i.p+nlh-reducer.c[1625,1638] [2024-09-20 20:09:07,424 WARN L248 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/certificate-witnesses-artifact/sv-benchmarks/c/loop-invgen/apache-get-tag.i.p+nlh-reducer.c[1840,1853] [2024-09-20 20:09:07,425 WARN L248 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/certificate-witnesses-artifact/sv-benchmarks/c/loop-invgen/apache-get-tag.i.p+nlh-reducer.c[2157,2170] [2024-09-20 20:09:07,427 WARN L248 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/certificate-witnesses-artifact/sv-benchmarks/c/loop-invgen/apache-get-tag.i.p+nlh-reducer.c[2372,2385] [2024-09-20 20:09:07,429 WARN L248 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/certificate-witnesses-artifact/sv-benchmarks/c/loop-invgen/apache-get-tag.i.p+nlh-reducer.c[2867,2880] [2024-09-20 20:09:07,430 WARN L248 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/certificate-witnesses-artifact/sv-benchmarks/c/loop-invgen/apache-get-tag.i.p+nlh-reducer.c[3082,3095] [2024-09-20 20:09:07,431 WARN L248 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/certificate-witnesses-artifact/sv-benchmarks/c/loop-invgen/apache-get-tag.i.p+nlh-reducer.c[3384,3397] [2024-09-20 20:09:07,433 WARN L248 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/certificate-witnesses-artifact/sv-benchmarks/c/loop-invgen/apache-get-tag.i.p+nlh-reducer.c[3602,3615] [2024-09-20 20:09:07,434 WARN L248 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/certificate-witnesses-artifact/sv-benchmarks/c/loop-invgen/apache-get-tag.i.p+nlh-reducer.c[3878,3891] [2024-09-20 20:09:07,435 WARN L248 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/certificate-witnesses-artifact/sv-benchmarks/c/loop-invgen/apache-get-tag.i.p+nlh-reducer.c[4096,4109] [2024-09-20 20:09:07,437 WARN L248 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/certificate-witnesses-artifact/sv-benchmarks/c/loop-invgen/apache-get-tag.i.p+nlh-reducer.c[4582,4595] [2024-09-20 20:09:07,438 WARN L248 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/certificate-witnesses-artifact/sv-benchmarks/c/loop-invgen/apache-get-tag.i.p+nlh-reducer.c[4800,4813] [2024-09-20 20:09:07,590 WARN L248 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/certificate-witnesses-artifact/sv-benchmarks/c/loop-invgen/apache-get-tag.i.p+nlh-reducer.c[47686,47699] [2024-09-20 20:09:07,593 WARN L248 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/certificate-witnesses-artifact/sv-benchmarks/c/loop-invgen/apache-get-tag.i.p+nlh-reducer.c[47907,47920] [2024-09-20 20:09:07,603 INFO L210 PostProcessor]: Analyzing one entry point: main [2024-09-20 20:09:07,613 INFO L200 MainTranslator]: Completed pre-run [2024-09-20 20:09:07,623 WARN L248 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/certificate-witnesses-artifact/sv-benchmarks/c/loop-invgen/apache-get-tag.i.p+nlh-reducer.c[901,914] [2024-09-20 20:09:07,624 WARN L248 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/certificate-witnesses-artifact/sv-benchmarks/c/loop-invgen/apache-get-tag.i.p+nlh-reducer.c[1116,1129] [2024-09-20 20:09:07,625 WARN L248 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/certificate-witnesses-artifact/sv-benchmarks/c/loop-invgen/apache-get-tag.i.p+nlh-reducer.c[1625,1638] [2024-09-20 20:09:07,625 WARN L248 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/certificate-witnesses-artifact/sv-benchmarks/c/loop-invgen/apache-get-tag.i.p+nlh-reducer.c[1840,1853] [2024-09-20 20:09:07,626 WARN L248 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/certificate-witnesses-artifact/sv-benchmarks/c/loop-invgen/apache-get-tag.i.p+nlh-reducer.c[2157,2170] [2024-09-20 20:09:07,627 WARN L248 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/certificate-witnesses-artifact/sv-benchmarks/c/loop-invgen/apache-get-tag.i.p+nlh-reducer.c[2372,2385] [2024-09-20 20:09:07,628 WARN L248 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/certificate-witnesses-artifact/sv-benchmarks/c/loop-invgen/apache-get-tag.i.p+nlh-reducer.c[2867,2880] [2024-09-20 20:09:07,629 WARN L248 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/certificate-witnesses-artifact/sv-benchmarks/c/loop-invgen/apache-get-tag.i.p+nlh-reducer.c[3082,3095] [2024-09-20 20:09:07,630 WARN L248 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/certificate-witnesses-artifact/sv-benchmarks/c/loop-invgen/apache-get-tag.i.p+nlh-reducer.c[3384,3397] [2024-09-20 20:09:07,631 WARN L248 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/certificate-witnesses-artifact/sv-benchmarks/c/loop-invgen/apache-get-tag.i.p+nlh-reducer.c[3602,3615] [2024-09-20 20:09:07,632 WARN L248 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/certificate-witnesses-artifact/sv-benchmarks/c/loop-invgen/apache-get-tag.i.p+nlh-reducer.c[3878,3891] [2024-09-20 20:09:07,632 WARN L248 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/certificate-witnesses-artifact/sv-benchmarks/c/loop-invgen/apache-get-tag.i.p+nlh-reducer.c[4096,4109] [2024-09-20 20:09:07,634 WARN L248 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/certificate-witnesses-artifact/sv-benchmarks/c/loop-invgen/apache-get-tag.i.p+nlh-reducer.c[4582,4595] [2024-09-20 20:09:07,634 WARN L248 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/certificate-witnesses-artifact/sv-benchmarks/c/loop-invgen/apache-get-tag.i.p+nlh-reducer.c[4800,4813] Start Parsing Local Start Parsing Local [2024-09-20 20:09:07,779 WARN L248 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/certificate-witnesses-artifact/sv-benchmarks/c/loop-invgen/apache-get-tag.i.p+nlh-reducer.c[47686,47699] [2024-09-20 20:09:07,784 WARN L248 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/certificate-witnesses-artifact/sv-benchmarks/c/loop-invgen/apache-get-tag.i.p+nlh-reducer.c[47907,47920] Start Parsing Local Start Parsing Local Start Parsing Local [2024-09-20 20:09:07,798 INFO L210 PostProcessor]: Analyzing one entry point: main [2024-09-20 20:09:07,826 INFO L204 MainTranslator]: Completed translation [2024-09-20 20:09:07,827 INFO L201 PluginConnector]: Adding new model witness-2.1.yml de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator CORRECTNESS_WITNESS 20.09 08:09:07 WrapperNode [2024-09-20 20:09:07,827 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2024-09-20 20:09:07,828 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2024-09-20 20:09:07,828 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2024-09-20 20:09:07,828 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2024-09-20 20:09:07,851 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "witness-2.1.yml de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator CORRECTNESS_WITNESS 20.09 08:09:07" (1/1) ... [2024-09-20 20:09:07,851 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "witness-2.1.yml de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator CORRECTNESS_WITNESS 20.09 08:09:07" (1/1) ... [2024-09-20 20:09:07,875 INFO L184 PluginConnector]: Executing the observer MemorySlicer from plugin Boogie Preprocessor for "witness-2.1.yml de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator CORRECTNESS_WITNESS 20.09 08:09:07" (1/1) ... [2024-09-20 20:09:07,910 INFO L175 MemorySlicer]: Split 2 memory accesses to 1 slices as follows [2]. 100 percent of accesses are in the largest equivalence class. The 2 initializations are split as follows [2]. The 0 writes are split as follows [0]. [2024-09-20 20:09:07,911 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "witness-2.1.yml de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator CORRECTNESS_WITNESS 20.09 08:09:07" (1/1) ... [2024-09-20 20:09:07,911 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "witness-2.1.yml de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator CORRECTNESS_WITNESS 20.09 08:09:07" (1/1) ... [2024-09-20 20:09:07,949 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "witness-2.1.yml de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator CORRECTNESS_WITNESS 20.09 08:09:07" (1/1) ... [2024-09-20 20:09:07,957 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "witness-2.1.yml de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator CORRECTNESS_WITNESS 20.09 08:09:07" (1/1) ... [2024-09-20 20:09:07,961 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "witness-2.1.yml de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator CORRECTNESS_WITNESS 20.09 08:09:07" (1/1) ... [2024-09-20 20:09:07,964 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "witness-2.1.yml de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator CORRECTNESS_WITNESS 20.09 08:09:07" (1/1) ... [2024-09-20 20:09:07,969 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2024-09-20 20:09:07,970 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2024-09-20 20:09:07,970 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2024-09-20 20:09:07,971 INFO L274 PluginConnector]: RCFGBuilder initialized [2024-09-20 20:09:07,971 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "witness-2.1.yml de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator CORRECTNESS_WITNESS 20.09 08:09:07" (1/1) ... [2024-09-20 20:09:07,982 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 [2024-09-20 20:09:07,994 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/certificate-witnesses-artifact/referee/z3 [2024-09-20 20:09:08,026 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/certificate-witnesses-artifact/referee/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 (exit command is (exit), workingDir is null) [2024-09-20 20:09:08,036 INFO L327 MonitoredProcess]: [MP /storage/repos/certificate-witnesses-artifact/referee/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 (1)] Waiting until timeout for monitored process [2024-09-20 20:09:08,102 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2024-09-20 20:09:08,102 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2024-09-20 20:09:08,103 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2024-09-20 20:09:08,103 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2024-09-20 20:09:08,103 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2024-09-20 20:09:08,103 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2024-09-20 20:09:08,103 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2024-09-20 20:09:08,103 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2024-09-20 20:09:08,103 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2024-09-20 20:09:08,103 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2024-09-20 20:09:08,103 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2024-09-20 20:09:08,103 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2024-09-20 20:09:08,103 INFO L130 BoogieDeclarations]: Found specification of procedure main [2024-09-20 20:09:08,104 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2024-09-20 20:09:08,104 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1#0 [2024-09-20 20:09:08,104 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2024-09-20 20:09:08,104 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE1#0 [2024-09-20 20:09:08,104 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE1#0 [2024-09-20 20:09:08,104 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2024-09-20 20:09:08,322 INFO L242 CfgBuilder]: Building ICFG [2024-09-20 20:09:08,327 INFO L268 CfgBuilder]: Building CFG for each procedure with an implementation [2024-09-20 20:09:09,939 INFO L291 CfgBuilder]: Performing block encoding [2024-09-20 20:09:10,025 INFO L313 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2024-09-20 20:09:10,025 INFO L318 CfgBuilder]: Removed 0 assume(true) statements. [2024-09-20 20:09:10,026 INFO L201 PluginConnector]: Adding new model witness-2.1.yml de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.09 08:09:10 BoogieIcfgContainer [2024-09-20 20:09:10,026 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2024-09-20 20:09:10,029 INFO L112 PluginConnector]: ------------------------Referee---------------------------- [2024-09-20 20:09:10,030 INFO L270 PluginConnector]: Initializing Referee... [2024-09-20 20:09:10,031 INFO L274 PluginConnector]: Referee initialized [2024-09-20 20:09:10,034 INFO L184 PluginConnector]: Executing the observer RefereeObserver from plugin Referee for "CDTParser AST 20.09 08:09:07" (1/4) ... [2024-09-20 20:09:10,035 INFO L204 PluginConnector]: Invalid model from Referee for observer de.uni_freiburg.informatik.ultimate.plugins.generator.referee.RefereeObserver@1131e1ea and model type de.uni_freiburg.informatik.ultimate.plugins.generator.referee AST 20.09 08:09:10, skipping insertion in model container [2024-09-20 20:09:10,035 INFO L184 PluginConnector]: Executing the observer RefereeObserver from plugin Referee for "witness-2.1.yml de.uni_freiburg.informatik.ultimate.witnessparser CORRECTNESS_WITNESS 20.09 08:09:07" (2/4) ... [2024-09-20 20:09:10,035 INFO L204 PluginConnector]: Invalid model from Referee for observer de.uni_freiburg.informatik.ultimate.plugins.generator.referee.RefereeObserver@1131e1ea and model type witness-2.1.yml de.uni_freiburg.informatik.ultimate.plugins.generator.referee CORRECTNESS_WITNESS 20.09 08:09:10, skipping insertion in model container [2024-09-20 20:09:10,035 INFO L184 PluginConnector]: Executing the observer RefereeObserver from plugin Referee for "witness-2.1.yml de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator CORRECTNESS_WITNESS 20.09 08:09:07" (3/4) ... [2024-09-20 20:09:10,035 INFO L204 PluginConnector]: Invalid model from Referee for observer de.uni_freiburg.informatik.ultimate.plugins.generator.referee.RefereeObserver@1131e1ea and model type witness-2.1.yml de.uni_freiburg.informatik.ultimate.plugins.generator.referee CORRECTNESS_WITNESS 20.09 08:09:10, skipping insertion in model container [2024-09-20 20:09:10,035 INFO L184 PluginConnector]: Executing the observer RefereeObserver from plugin Referee for "witness-2.1.yml de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.09 08:09:10" (4/4) ... [2024-09-20 20:09:10,037 INFO L79 RefereeObserver]: Analyzing ICFG apache-get-tag.i.p+nlh-reducer.c [2024-09-20 20:09:10,045 INFO L113 InvariantChecker]: Found 0 loops. [2024-09-20 20:09:10,046 INFO L373 InvariantChecker]: Will check inductivity from ENTRY $Ultimate##0 to ERROR_LOC mainErr9ASSERT_VIOLATIONWITNESS_INVARIANT. Corresponding subgraph has 328 edges. [2024-09-20 20:09:10,052 INFO L373 InvariantChecker]: Will check inductivity from ENTRY $Ultimate##0 to ERROR_LOC mainErr13ASSERT_VIOLATIONERROR_FUNCTION. Corresponding subgraph has 331 edges. [2024-09-20 20:09:10,052 INFO L373 InvariantChecker]: Will check inductivity from ENTRY $Ultimate##0 to ERROR_LOC mainErr3ASSERT_VIOLATIONWITNESS_INVARIANT. Corresponding subgraph has 5 edges. [2024-09-20 20:09:10,052 INFO L373 InvariantChecker]: Will check inductivity from ENTRY $Ultimate##0 to ERROR_LOC mainErr2ASSERT_VIOLATIONERROR_FUNCTION. Corresponding subgraph has 314 edges. [2024-09-20 20:09:10,053 INFO L373 InvariantChecker]: Will check inductivity from ENTRY $Ultimate##0 to ERROR_LOC mainErr12ASSERT_VIOLATIONERROR_FUNCTION. Corresponding subgraph has 330 edges. [2024-09-20 20:09:10,053 INFO L373 InvariantChecker]: Will check inductivity from ENTRY $Ultimate##0 to ERROR_LOC mainErr6ASSERT_VIOLATIONWITNESS_INVARIANT. Corresponding subgraph has 328 edges. [2024-09-20 20:09:10,053 INFO L373 InvariantChecker]: Will check inductivity from ENTRY $Ultimate##0 to ERROR_LOC mainErr16ASSERT_VIOLATIONERROR_FUNCTION. Corresponding subgraph has 330 edges. [2024-09-20 20:09:10,054 INFO L373 InvariantChecker]: Will check inductivity from ENTRY $Ultimate##0 to ERROR_LOC mainErr5ASSERT_VIOLATIONERROR_FUNCTION. Corresponding subgraph has 314 edges. [2024-09-20 20:09:10,054 INFO L373 InvariantChecker]: Will check inductivity from ENTRY $Ultimate##0 to ERROR_LOC mainErr19ASSERT_VIOLATIONERROR_FUNCTION. Corresponding subgraph has 251 edges. [2024-09-20 20:09:10,055 INFO L373 InvariantChecker]: Will check inductivity from ENTRY $Ultimate##0 to ERROR_LOC mainErr7ASSERT_VIOLATIONERROR_FUNCTION. Corresponding subgraph has 330 edges. [2024-09-20 20:09:10,055 INFO L373 InvariantChecker]: Will check inductivity from ENTRY $Ultimate##0 to ERROR_LOC mainErr1ASSERT_VIOLATIONERROR_FUNCTION. Corresponding subgraph has 313 edges. [2024-09-20 20:09:10,055 INFO L373 InvariantChecker]: Will check inductivity from ENTRY $Ultimate##0 to ERROR_LOC mainErr11ASSERT_VIOLATIONERROR_FUNCTION. Corresponding subgraph has 329 edges. [2024-09-20 20:09:10,056 INFO L373 InvariantChecker]: Will check inductivity from ENTRY $Ultimate##0 to ERROR_LOC mainErr14ASSERT_VIOLATIONERROR_FUNCTION. Corresponding subgraph has 329 edges. [2024-09-20 20:09:10,058 INFO L373 InvariantChecker]: Will check inductivity from ENTRY $Ultimate##0 to ERROR_LOC mainErr8ASSERT_VIOLATIONERROR_FUNCTION. Corresponding subgraph has 331 edges. [2024-09-20 20:09:10,062 INFO L373 InvariantChecker]: Will check inductivity from ENTRY $Ultimate##0 to ERROR_LOC mainErr18ASSERT_VIOLATIONWITNESS_INVARIANT. Corresponding subgraph has 243 edges. [2024-09-20 20:09:10,062 INFO L373 InvariantChecker]: Will check inductivity from ENTRY $Ultimate##0 to ERROR_LOC mainErr15ASSERT_VIOLATIONERROR_FUNCTION. Corresponding subgraph has 329 edges. [2024-09-20 20:09:10,062 INFO L373 InvariantChecker]: Will check inductivity from ENTRY $Ultimate##0 to ERROR_LOC mainErr20ASSERT_VIOLATIONERROR_FUNCTION. Corresponding subgraph has 251 edges. [2024-09-20 20:09:10,063 INFO L373 InvariantChecker]: Will check inductivity from ENTRY $Ultimate##0 to ERROR_LOC mainErr0ASSERT_VIOLATIONWITNESS_INVARIANT. Corresponding subgraph has 3 edges. [2024-09-20 20:09:10,064 INFO L373 InvariantChecker]: Will check inductivity from ENTRY $Ultimate##0 to ERROR_LOC mainErr17ASSERT_VIOLATIONERROR_FUNCTION. Corresponding subgraph has 331 edges. [2024-09-20 20:09:10,064 INFO L373 InvariantChecker]: Will check inductivity from ENTRY $Ultimate##0 to ERROR_LOC mainErr4ASSERT_VIOLATIONERROR_FUNCTION. Corresponding subgraph has 313 edges. [2024-09-20 20:09:10,064 INFO L373 InvariantChecker]: Will check inductivity from ENTRY $Ultimate##0 to ERROR_LOC mainErr10ASSERT_VIOLATIONERROR_FUNCTION. Corresponding subgraph has 329 edges. [2024-09-20 20:09:10,065 INFO L131 InvariantChecker]: Will check 21 loop-free subgraphs from procedure entry to error location [2024-09-20 20:09:10,226 INFO L314 BlockEncoder]: Initial Icfg 265 locations, 328 edges [2024-09-20 20:09:10,227 INFO L264 BlockEncoder]: Using Maximize final states [2024-09-20 20:09:10,228 INFO L271 BlockEncoder]: Using Minimize states even if more edges are added than removed.=true [2024-09-20 20:09:10,228 INFO L277 BlockEncoder]: Using Minimize states using LBE with the strategy=MULTI [2024-09-20 20:09:10,229 INFO L172 BlockEncoder]: Using Apply optimizations until nothing changes=true [2024-09-20 20:09:10,231 INFO L71 MaximizeFinalStates]: 0 new accepting states [2024-09-20 20:09:19,067 INFO L101 BaseMinimizeStates]: Removed 1284 edges and 261 locations by large block encoding [2024-09-20 20:09:19,069 INFO L71 MaximizeFinalStates]: 0 new accepting states [2024-09-20 20:09:19,069 INFO L101 BaseMinimizeStates]: Removed 0 edges and 0 locations by large block encoding [2024-09-20 20:09:19,069 INFO L238 BlockEncoder]: Using Create parallel compositions if possible [2024-09-20 20:09:19,070 INFO L68 ParallelComposer]: Creating parallel compositions [2024-09-20 20:09:20,467 INFO L314 BlockEncoder]: Encoded RCFG 4 locations, 8 edges [2024-09-20 20:09:20,468 FATAL L? ?]: The Plugin de.uni_freiburg.informatik.ultimate.plugins.generator.referee has thrown an exception: java.lang.AssertionError: Either subgraph not acyclic or there is a bug at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AcyclicSubgraphMerger.(AcyclicSubgraphMerger.java:169) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.InvariantChecker.(InvariantChecker.java:145) at de.uni_freiburg.informatik.ultimate.plugins.generator.referee.RefereeStarter.(RefereeStarter.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.referee.RefereeObserver.finish(RefereeObserver.java:80) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2024-09-20 20:09:20,473 INFO L158 Benchmark]: Toolchain (without parser) took 13366.48ms. Allocated memory was 88.1MB in the beginning and 8.7GB in the end (delta: 8.6GB). Free memory was 48.0MB in the beginning and 8.5GB in the end (delta: -8.4GB). Peak memory consumption was 553.6MB. Max. memory is 16.1GB. [2024-09-20 20:09:20,474 INFO L158 Benchmark]: CDTParser took 0.18ms. Allocated memory is still 88.1MB. Free memory is still 68.2MB. There was no memory consumed. Max. memory is 16.1GB. [2024-09-20 20:09:20,474 INFO L158 Benchmark]: Witness Parser took 0.08ms. Allocated memory is still 88.1MB. Free memory is still 49.9MB. There was no memory consumed. Max. memory is 16.1GB. [2024-09-20 20:09:20,475 INFO L158 Benchmark]: CACSL2BoogieTranslator took 717.16ms. Allocated memory was 88.1MB in the beginning and 127.9MB in the end (delta: 39.8MB). Free memory was 47.7MB in the beginning and 93.4MB in the end (delta: -45.7MB). Peak memory consumption was 16.6MB. Max. memory is 16.1GB. [2024-09-20 20:09:20,475 INFO L158 Benchmark]: Boogie Preprocessor took 142.22ms. Allocated memory is still 127.9MB. Free memory was 93.4MB in the beginning and 85.0MB in the end (delta: 8.4MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. [2024-09-20 20:09:20,476 INFO L158 Benchmark]: RCFGBuilder took 2055.73ms. Allocated memory is still 127.9MB. Free memory was 85.0MB in the beginning and 55.6MB in the end (delta: 29.4MB). Peak memory consumption was 43.9MB. Max. memory is 16.1GB. [2024-09-20 20:09:20,477 INFO L158 Benchmark]: Referee took 10443.13ms. Allocated memory was 127.9MB in the beginning and 8.7GB in the end (delta: 8.6GB). Free memory was 55.6MB in the beginning and 8.5GB in the end (delta: -8.4GB). Peak memory consumption was 522.4MB. Max. memory is 16.1GB. [2024-09-20 20:09:20,478 INFO L338 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.referee: - ExceptionOrErrorResult: AssertionError: Either subgraph not acyclic or there is a bug de.uni_freiburg.informatik.ultimate.plugins.generator.referee: AssertionError: Either subgraph not acyclic or there is a bug: de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AcyclicSubgraphMerger.(AcyclicSubgraphMerger.java:169) * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.18ms. Allocated memory is still 88.1MB. Free memory is still 68.2MB. There was no memory consumed. Max. memory is 16.1GB. * Witness Parser took 0.08ms. Allocated memory is still 88.1MB. Free memory is still 49.9MB. There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 717.16ms. Allocated memory was 88.1MB in the beginning and 127.9MB in the end (delta: 39.8MB). Free memory was 47.7MB in the beginning and 93.4MB in the end (delta: -45.7MB). Peak memory consumption was 16.6MB. Max. memory is 16.1GB. * Boogie Preprocessor took 142.22ms. Allocated memory is still 127.9MB. Free memory was 93.4MB in the beginning and 85.0MB in the end (delta: 8.4MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. * RCFGBuilder took 2055.73ms. Allocated memory is still 127.9MB. Free memory was 85.0MB in the beginning and 55.6MB in the end (delta: 29.4MB). Peak memory consumption was 43.9MB. Max. memory is 16.1GB. * Referee took 10443.13ms. Allocated memory was 127.9MB in the beginning and 8.7GB in the end (delta: 8.6GB). Free memory was 55.6MB in the beginning and 8.5GB in the end (delta: -8.4GB). Peak memory consumption was 522.4MB. Max. memory is 16.1GB. RESULT: Ultimate could not prove your program: Toolchain returned no result. [2024-09-20 20:09:20,518 INFO L540 MonitoredProcess]: [MP /storage/repos/certificate-witnesses-artifact/referee/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 (1)] Forceful destruction successful, exit code 0 Received shutdown request... --- End real Ultimate output --- Execution finished normally Writing output log to file Ultimate.log Result: ERROR: ExceptionOrErrorResult: AssertionError: Either subgraph not acyclic or there is a bug