./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/hardness-nfm22/hardness_operatoramount_amount50_file-40.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version a0165632 Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6baf67e-2884-419c-8951-8a6c41221f65/bin/ukojak-verify-ImItNfHLgk/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6baf67e-2884-419c-8951-8a6c41221f65/bin/ukojak-verify-ImItNfHLgk/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6baf67e-2884-419c-8951-8a6c41221f65/bin/ukojak-verify-ImItNfHLgk/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6baf67e-2884-419c-8951-8a6c41221f65/bin/ukojak-verify-ImItNfHLgk/config/KojakReach.xml -i ../../sv-benchmarks/c/hardness-nfm22/hardness_operatoramount_amount50_file-40.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6baf67e-2884-419c-8951-8a6c41221f65/bin/ukojak-verify-ImItNfHLgk/config/svcomp-Reach-32bit-Kojak_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6baf67e-2884-419c-8951-8a6c41221f65/bin/ukojak-verify-ImItNfHLgk --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Kojak --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash cd267da1d9fa095308e80beee115709feea95ca2b3783ef3fcc417894e57dfd6 --- Real Ultimate output --- This is Ultimate 0.2.5-dev-a016563 [2024-11-08 19:42:04,592 INFO L188 SettingsManager]: Resetting all preferences to default values... [2024-11-08 19:42:04,691 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6baf67e-2884-419c-8951-8a6c41221f65/bin/ukojak-verify-ImItNfHLgk/config/svcomp-Reach-32bit-Kojak_Default.epf [2024-11-08 19:42:04,700 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2024-11-08 19:42:04,703 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.plugins.generator.codecheck.Interpolating solver [2024-11-08 19:42:04,755 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2024-11-08 19:42:04,756 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2024-11-08 19:42:04,756 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ALWAYS [2024-11-08 19:42:04,756 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2024-11-08 19:42:04,757 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2024-11-08 19:42:04,757 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2024-11-08 19:42:04,758 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2024-11-08 19:42:04,759 INFO L153 SettingsManager]: * sizeof long=4 [2024-11-08 19:42:04,761 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2024-11-08 19:42:04,761 INFO L153 SettingsManager]: * sizeof POINTER=4 [2024-11-08 19:42:04,761 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2024-11-08 19:42:04,762 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2024-11-08 19:42:04,766 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2024-11-08 19:42:04,766 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2024-11-08 19:42:04,766 INFO L153 SettingsManager]: * Allow undefined functions=false [2024-11-08 19:42:04,767 INFO L153 SettingsManager]: * sizeof long double=12 [2024-11-08 19:42:04,767 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2024-11-08 19:42:04,767 INFO L153 SettingsManager]: * Use constant arrays=true [2024-11-08 19:42:04,768 INFO L151 SettingsManager]: Preferences of CodeCheck differ from their defaults: [2024-11-08 19:42:04,768 INFO L153 SettingsManager]: * Timeout in seconds=1000000 [2024-11-08 19:42:04,768 INFO L153 SettingsManager]: * Theory for external solver=ALL [2024-11-08 19:42:04,768 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2024-11-08 19:42:04,769 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:10000 [2024-11-08 19:42:04,769 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2024-11-08 19:42:04,769 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2024-11-08 19:42:04,769 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2024-11-08 19:42:04,770 INFO L153 SettingsManager]: * Trace refinement strategy=PENGUIN [2024-11-08 19:42:04,770 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2024-11-08 19:42:04,770 INFO L153 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_d6baf67e-2884-419c-8951-8a6c41221f65/bin/ukojak-verify-ImItNfHLgk/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6baf67e-2884-419c-8951-8a6c41221f65/bin/ukojak-verify-ImItNfHLgk Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Kojak Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> cd267da1d9fa095308e80beee115709feea95ca2b3783ef3fcc417894e57dfd6 [2024-11-08 19:42:05,079 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2024-11-08 19:42:05,143 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2024-11-08 19:42:05,151 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2024-11-08 19:42:05,157 INFO L270 PluginConnector]: Initializing CDTParser... [2024-11-08 19:42:05,158 INFO L274 PluginConnector]: CDTParser initialized [2024-11-08 19:42:05,160 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6baf67e-2884-419c-8951-8a6c41221f65/bin/ukojak-verify-ImItNfHLgk/../../sv-benchmarks/c/hardness-nfm22/hardness_operatoramount_amount50_file-40.i Unable to find full path for "g++" [2024-11-08 19:42:07,182 INFO L533 CDTParser]: Created temporary CDT project at NULL [2024-11-08 19:42:07,392 INFO L384 CDTParser]: Found 1 translation units. [2024-11-08 19:42:07,393 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6baf67e-2884-419c-8951-8a6c41221f65/sv-benchmarks/c/hardness-nfm22/hardness_operatoramount_amount50_file-40.i [2024-11-08 19:42:07,403 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6baf67e-2884-419c-8951-8a6c41221f65/bin/ukojak-verify-ImItNfHLgk/data/35c0c1678/59cc9db80c164c949d6784ed95aff101/FLAG6acc8199b [2024-11-08 19:42:07,421 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6baf67e-2884-419c-8951-8a6c41221f65/bin/ukojak-verify-ImItNfHLgk/data/35c0c1678/59cc9db80c164c949d6784ed95aff101 [2024-11-08 19:42:07,424 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2024-11-08 19:42:07,426 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2024-11-08 19:42:07,428 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2024-11-08 19:42:07,428 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2024-11-08 19:42:07,434 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2024-11-08 19:42:07,435 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 08.11 07:42:07" (1/1) ... [2024-11-08 19:42:07,436 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7a36cce9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.11 07:42:07, skipping insertion in model container [2024-11-08 19:42:07,436 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 08.11 07:42:07" (1/1) ... [2024-11-08 19:42:07,493 INFO L175 MainTranslator]: Built tables and reachable declarations [2024-11-08 19:42:07,698 WARN L250 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_d6baf67e-2884-419c-8951-8a6c41221f65/sv-benchmarks/c/hardness-nfm22/hardness_operatoramount_amount50_file-40.i[915,928] [2024-11-08 19:42:07,756 INFO L210 PostProcessor]: Analyzing one entry point: main [2024-11-08 19:42:07,771 INFO L200 MainTranslator]: Completed pre-run [2024-11-08 19:42:07,782 WARN L250 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_d6baf67e-2884-419c-8951-8a6c41221f65/sv-benchmarks/c/hardness-nfm22/hardness_operatoramount_amount50_file-40.i[915,928] [2024-11-08 19:42:07,826 INFO L210 PostProcessor]: Analyzing one entry point: main [2024-11-08 19:42:07,855 INFO L204 MainTranslator]: Completed translation [2024-11-08 19:42:07,856 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.11 07:42:07 WrapperNode [2024-11-08 19:42:07,856 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2024-11-08 19:42:07,857 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2024-11-08 19:42:07,858 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2024-11-08 19:42:07,858 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2024-11-08 19:42:07,866 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.11 07:42:07" (1/1) ... [2024-11-08 19:42:07,882 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.11 07:42:07" (1/1) ... [2024-11-08 19:42:07,932 INFO L138 Inliner]: procedures = 26, calls = 25, calls flagged for inlining = 8, calls inlined = 8, statements flattened = 108 [2024-11-08 19:42:07,933 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2024-11-08 19:42:07,934 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2024-11-08 19:42:07,934 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2024-11-08 19:42:07,934 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2024-11-08 19:42:07,944 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.11 07:42:07" (1/1) ... [2024-11-08 19:42:07,945 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.11 07:42:07" (1/1) ... [2024-11-08 19:42:07,948 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.11 07:42:07" (1/1) ... [2024-11-08 19:42:07,949 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.11 07:42:07" (1/1) ... [2024-11-08 19:42:07,958 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.11 07:42:07" (1/1) ... [2024-11-08 19:42:07,970 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.11 07:42:07" (1/1) ... [2024-11-08 19:42:07,972 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.11 07:42:07" (1/1) ... [2024-11-08 19:42:07,978 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.11 07:42:07" (1/1) ... [2024-11-08 19:42:07,982 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2024-11-08 19:42:07,984 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2024-11-08 19:42:07,984 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2024-11-08 19:42:07,984 INFO L274 PluginConnector]: RCFGBuilder initialized [2024-11-08 19:42:07,985 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.11 07:42:07" (1/1) ... [2024-11-08 19:42:07,991 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:10000 [2024-11-08 19:42:08,003 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6baf67e-2884-419c-8951-8a6c41221f65/bin/ukojak-verify-ImItNfHLgk/z3 [2024-11-08 19:42:08,024 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6baf67e-2884-419c-8951-8a6c41221f65/bin/ukojak-verify-ImItNfHLgk/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:10000 (exit command is (exit), workingDir is null) [2024-11-08 19:42:08,028 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6baf67e-2884-419c-8951-8a6c41221f65/bin/ukojak-verify-ImItNfHLgk/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:10000 (1)] Waiting until timeout for monitored process [2024-11-08 19:42:08,065 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2024-11-08 19:42:08,065 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2024-11-08 19:42:08,065 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2024-11-08 19:42:08,066 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2024-11-08 19:42:08,066 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2024-11-08 19:42:08,067 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2024-11-08 19:42:08,184 INFO L238 CfgBuilder]: Building ICFG [2024-11-08 19:42:08,189 INFO L264 CfgBuilder]: Building CFG for each procedure with an implementation [2024-11-08 19:42:08,588 INFO L? ?]: Removed 14 outVars from TransFormulas that were not future-live. [2024-11-08 19:42:08,588 INFO L287 CfgBuilder]: Performing block encoding [2024-11-08 19:42:08,806 INFO L311 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2024-11-08 19:42:08,806 INFO L316 CfgBuilder]: Removed 1 assume(true) statements. [2024-11-08 19:42:08,809 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 08.11 07:42:08 BoogieIcfgContainer [2024-11-08 19:42:08,809 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2024-11-08 19:42:08,810 INFO L112 PluginConnector]: ------------------------CodeCheck---------------------------- [2024-11-08 19:42:08,811 INFO L270 PluginConnector]: Initializing CodeCheck... [2024-11-08 19:42:08,821 INFO L274 PluginConnector]: CodeCheck initialized [2024-11-08 19:42:08,821 INFO L184 PluginConnector]: Executing the observer CodeCheckObserver from plugin CodeCheck for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 08.11 07:42:08" (1/1) ... [2024-11-08 19:42:08,834 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-08 19:42:08,880 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2024-11-08 19:42:08,886 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 27 states and 39 transitions. [2024-11-08 19:42:08,887 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 39 transitions. [2024-11-08 19:42:08,907 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2024-11-08 19:42:08,907 INFO L420 CodeCheckObserver]: Error Path is FOUND. [2024-11-08 19:42:08,908 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-08 19:42:09,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-11-08 19:42:09,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2024-11-08 19:42:09,446 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2024-11-08 19:42:09,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2024-11-08 19:42:09,562 WARN L473 CodeCheckObserver]: This program is UNSAFE, Check terminated with 1 iterations. [2024-11-08 19:42:09,642 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.codecheck CFG 08.11 07:42:09 ImpRootNode [2024-11-08 19:42:09,642 INFO L131 PluginConnector]: ------------------------ END CodeCheck---------------------------- [2024-11-08 19:42:09,643 INFO L112 PluginConnector]: ------------------------Witness Printer---------------------------- [2024-11-08 19:42:09,643 INFO L270 PluginConnector]: Initializing Witness Printer... [2024-11-08 19:42:09,643 INFO L274 PluginConnector]: Witness Printer initialized [2024-11-08 19:42:09,644 INFO L184 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 08.11 07:42:08" (3/4) ... [2024-11-08 19:42:09,647 INFO L145 WitnessPrinter]: No result that supports witness generation found [2024-11-08 19:42:09,648 INFO L131 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2024-11-08 19:42:09,650 INFO L158 Benchmark]: Toolchain (without parser) took 2223.40ms. Allocated memory was 130.0MB in the beginning and 163.6MB in the end (delta: 33.6MB). Free memory was 67.6MB in the beginning and 102.3MB in the end (delta: -34.8MB). Peak memory consumption was 782.1kB. Max. memory is 16.1GB. [2024-11-08 19:42:09,650 INFO L158 Benchmark]: CDTParser took 0.37ms. Allocated memory is still 130.0MB. Free memory is still 104.2MB. There was no memory consumed. Max. memory is 16.1GB. [2024-11-08 19:42:09,652 INFO L158 Benchmark]: CACSL2BoogieTranslator took 428.74ms. Allocated memory was 130.0MB in the beginning and 163.6MB in the end (delta: 33.6MB). Free memory was 67.4MB in the beginning and 121.8MB in the end (delta: -54.3MB). Peak memory consumption was 5.2MB. Max. memory is 16.1GB. [2024-11-08 19:42:09,653 INFO L158 Benchmark]: Boogie Procedure Inliner took 75.57ms. Allocated memory is still 163.6MB. Free memory was 121.8MB in the beginning and 118.1MB in the end (delta: 3.7MB). Peak memory consumption was 4.2MB. Max. memory is 16.1GB. [2024-11-08 19:42:09,654 INFO L158 Benchmark]: Boogie Preprocessor took 49.31ms. Allocated memory is still 163.6MB. Free memory was 118.1MB in the beginning and 115.9MB in the end (delta: 2.1MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2024-11-08 19:42:09,655 INFO L158 Benchmark]: RCFGBuilder took 825.79ms. Allocated memory is still 163.6MB. Free memory was 115.9MB in the beginning and 79.8MB in the end (delta: 36.1MB). Peak memory consumption was 35.7MB. Max. memory is 16.1GB. [2024-11-08 19:42:09,656 INFO L158 Benchmark]: CodeCheck took 831.71ms. Allocated memory is still 163.6MB. Free memory was 79.3MB in the beginning and 102.3MB in the end (delta: -23.0MB). There was no memory consumed. Max. memory is 16.1GB. [2024-11-08 19:42:09,657 INFO L158 Benchmark]: Witness Printer took 5.84ms. Allocated memory is still 163.6MB. Free memory is still 102.3MB. There was no memory consumed. Max. memory is 16.1GB. [2024-11-08 19:42:09,661 INFO L338 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.codecheck: - StatisticsResult: Ultimate CodeCheck benchmark data CFG has 2 procedures, 27 locations, 1 error locations. Started 1 CEGAR loops. OverallTime: 0.7s, OverallIterations: 1, TraceHistogramMax: 0, PathProgramHistogramMax: 0, EmptinessCheckTime: 0.0s, AutomataDifference: 0.0s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: , PredicateUnifierStatistics: 0 DeclaredPredicates, 0 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=-1occurred in iteration=-1, InterpolantAutomatonStates: 0, traceCheckStatistics: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 0.0s InterpolantComputationTime, 46 NumberOfCodeBlocks, 46 NumberOfCodeBlocksAsserted, 1 NumberOfCheckSat, 0 ConstructedInterpolants, 0 QuantifiedInterpolants, 0 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 0 InterpolantComputations, 0 PerfectInterpolantSequences, 0/0 InterpolantCoveringCapability, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: No data available, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: No data available, ReuseStatistics: No data available - UnprovableResult [Line: 19]: Unable to prove that a call to reach_error is unreachable Unable to prove that a call to reach_error is unreachable Reason: overapproximation of someBinaryFLOATComparisonOperation at line 43, overapproximation of someBinaryDOUBLEComparisonOperation at line 106, overapproximation of someUnaryDOUBLEoperation at line 35. Possible FailurePath: [L21] unsigned char isInitial = 0; [L22] unsigned short int var_1_1 = 128; [L23] signed short int var_1_4 = -200; [L24] unsigned short int var_1_8 = 5; [L25] unsigned char var_1_9 = 1; [L26] unsigned char var_1_10 = 0; [L27] unsigned char var_1_11 = 0; [L28] unsigned char var_1_12 = 16; [L29] unsigned char var_1_15 = 50; [L30] unsigned short int var_1_16 = 1; [L31] float var_1_17 = 25.4; [L32] float var_1_20 = 1.6; [L33] unsigned short int var_1_21 = 0; [L34] float var_1_24 = 128.5; [L35] double var_1_25 = -0.5; [L36] signed long int var_1_26 = 4; [L37] unsigned char last_1_var_1_9 = 1; [L38] float last_1_var_1_24 = 128.5; [L110] isInitial = 1 [L111] FCALL initially() [L112] COND TRUE 1 [L113] CALL updateLastVariables() [L102] last_1_var_1_9 = var_1_9 [L103] last_1_var_1_24 = var_1_24 [L113] RET updateLastVariables() [L114] CALL updateVariables() [L82] var_1_4 = __VERIFIER_nondet_short() [L83] CALL assume_abort_if_not(var_1_4 >= -32768) VAL [\old(cond)=1, isInitial=1, last_1_var_1_24=257/2, last_1_var_1_9=1, var_1_10=0, var_1_11=0, var_1_12=16, var_1_15=50, var_1_16=1, var_1_17=127/5, var_1_1=128, var_1_20=8/5, var_1_21=0, var_1_24=257/2, var_1_26=4, var_1_4=2, var_1_8=5, var_1_9=1] [L20] COND FALSE !(!cond) [L83] RET assume_abort_if_not(var_1_4 >= -32768) VAL [isInitial=1, last_1_var_1_24=257/2, last_1_var_1_9=1, var_1_10=0, var_1_11=0, var_1_12=16, var_1_15=50, var_1_16=1, var_1_17=127/5, var_1_1=128, var_1_20=8/5, var_1_21=0, var_1_24=257/2, var_1_26=4, var_1_4=2, var_1_8=5, var_1_9=1] [L84] CALL assume_abort_if_not(var_1_4 <= 32767) VAL [\old(cond)=1, isInitial=1, last_1_var_1_24=257/2, last_1_var_1_9=1, var_1_10=0, var_1_11=0, var_1_12=16, var_1_15=50, var_1_16=1, var_1_17=127/5, var_1_1=128, var_1_20=8/5, var_1_21=0, var_1_24=257/2, var_1_26=4, var_1_4=2, var_1_8=5, var_1_9=1] [L20] COND FALSE !(!cond) [L84] RET assume_abort_if_not(var_1_4 <= 32767) VAL [isInitial=1, last_1_var_1_24=257/2, last_1_var_1_9=1, var_1_10=0, var_1_11=0, var_1_12=16, var_1_15=50, var_1_16=1, var_1_17=127/5, var_1_1=128, var_1_20=8/5, var_1_21=0, var_1_24=257/2, var_1_26=4, var_1_4=2, var_1_8=5, var_1_9=1] [L85] CALL assume_abort_if_not(var_1_4 != 0) VAL [\old(cond)=1, isInitial=1, last_1_var_1_24=257/2, last_1_var_1_9=1, var_1_10=0, var_1_11=0, var_1_12=16, var_1_15=50, var_1_16=1, var_1_17=127/5, var_1_1=128, var_1_20=8/5, var_1_21=0, var_1_24=257/2, var_1_26=4, var_1_4=2, var_1_8=5, var_1_9=1] [L20] COND FALSE !(!cond) [L85] RET assume_abort_if_not(var_1_4 != 0) VAL [isInitial=1, last_1_var_1_24=257/2, last_1_var_1_9=1, var_1_10=0, var_1_11=0, var_1_12=16, var_1_15=50, var_1_16=1, var_1_17=127/5, var_1_1=128, var_1_20=8/5, var_1_21=0, var_1_24=257/2, var_1_26=4, var_1_4=2, var_1_8=5, var_1_9=1] [L86] var_1_8 = __VERIFIER_nondet_ushort() [L87] CALL assume_abort_if_not(var_1_8 >= 0) VAL [\old(cond)=1, isInitial=1, last_1_var_1_24=257/2, last_1_var_1_9=1, var_1_10=0, var_1_11=0, var_1_12=16, var_1_15=50, var_1_16=1, var_1_17=127/5, var_1_1=128, var_1_20=8/5, var_1_21=0, var_1_24=257/2, var_1_26=4, var_1_4=2, var_1_9=1] [L20] COND FALSE !(!cond) [L87] RET assume_abort_if_not(var_1_8 >= 0) VAL [isInitial=1, last_1_var_1_24=257/2, last_1_var_1_9=1, var_1_10=0, var_1_11=0, var_1_12=16, var_1_15=50, var_1_16=1, var_1_17=127/5, var_1_1=128, var_1_20=8/5, var_1_21=0, var_1_24=257/2, var_1_26=4, var_1_4=2, var_1_9=1] [L88] CALL assume_abort_if_not(var_1_8 <= 32767) VAL [\old(cond)=1, isInitial=1, last_1_var_1_24=257/2, last_1_var_1_9=1, var_1_10=0, var_1_11=0, var_1_12=16, var_1_15=50, var_1_16=1, var_1_17=127/5, var_1_1=128, var_1_20=8/5, var_1_21=0, var_1_24=257/2, var_1_26=4, var_1_4=2, var_1_8=0, var_1_9=1] [L20] COND FALSE !(!cond) [L88] RET assume_abort_if_not(var_1_8 <= 32767) VAL [isInitial=1, last_1_var_1_24=257/2, last_1_var_1_9=1, var_1_10=0, var_1_11=0, var_1_12=16, var_1_15=50, var_1_16=1, var_1_17=127/5, var_1_1=128, var_1_20=8/5, var_1_21=0, var_1_24=257/2, var_1_26=4, var_1_4=2, var_1_8=0, var_1_9=1] [L89] var_1_10 = __VERIFIER_nondet_uchar() [L90] CALL assume_abort_if_not(var_1_10 >= 0) VAL [\old(cond)=1, isInitial=1, last_1_var_1_24=257/2, last_1_var_1_9=1, var_1_11=0, var_1_12=16, var_1_15=50, var_1_16=1, var_1_17=127/5, var_1_1=128, var_1_20=8/5, var_1_21=0, var_1_24=257/2, var_1_26=4, var_1_4=2, var_1_8=0, var_1_9=1] [L20] COND FALSE !(!cond) [L90] RET assume_abort_if_not(var_1_10 >= 0) VAL [isInitial=1, last_1_var_1_24=257/2, last_1_var_1_9=1, var_1_11=0, var_1_12=16, var_1_15=50, var_1_16=1, var_1_17=127/5, var_1_1=128, var_1_20=8/5, var_1_21=0, var_1_24=257/2, var_1_26=4, var_1_4=2, var_1_8=0, var_1_9=1] [L91] CALL assume_abort_if_not(var_1_10 <= 1) VAL [\old(cond)=1, isInitial=1, last_1_var_1_24=257/2, last_1_var_1_9=1, var_1_10=-255, var_1_11=0, var_1_12=16, var_1_15=50, var_1_16=1, var_1_17=127/5, var_1_1=128, var_1_20=8/5, var_1_21=0, var_1_24=257/2, var_1_26=4, var_1_4=2, var_1_8=0, var_1_9=1] [L20] COND FALSE !(!cond) [L91] RET assume_abort_if_not(var_1_10 <= 1) VAL [isInitial=1, last_1_var_1_24=257/2, last_1_var_1_9=1, var_1_10=-255, var_1_11=0, var_1_12=16, var_1_15=50, var_1_16=1, var_1_17=127/5, var_1_1=128, var_1_20=8/5, var_1_21=0, var_1_24=257/2, var_1_26=4, var_1_4=2, var_1_8=0, var_1_9=1] [L92] var_1_11 = __VERIFIER_nondet_uchar() [L93] CALL assume_abort_if_not(var_1_11 >= 0) VAL [\old(cond)=1, isInitial=1, last_1_var_1_24=257/2, last_1_var_1_9=1, var_1_10=-255, var_1_12=16, var_1_15=50, var_1_16=1, var_1_17=127/5, var_1_1=128, var_1_20=8/5, var_1_21=0, var_1_24=257/2, var_1_26=4, var_1_4=2, var_1_8=0, var_1_9=1] [L20] COND FALSE !(!cond) [L93] RET assume_abort_if_not(var_1_11 >= 0) VAL [isInitial=1, last_1_var_1_24=257/2, last_1_var_1_9=1, var_1_10=-255, var_1_12=16, var_1_15=50, var_1_16=1, var_1_17=127/5, var_1_1=128, var_1_20=8/5, var_1_21=0, var_1_24=257/2, var_1_26=4, var_1_4=2, var_1_8=0, var_1_9=1] [L94] CALL assume_abort_if_not(var_1_11 <= 0) VAL [\old(cond)=1, isInitial=1, last_1_var_1_24=257/2, last_1_var_1_9=1, var_1_10=-255, var_1_11=0, var_1_12=16, var_1_15=50, var_1_16=1, var_1_17=127/5, var_1_1=128, var_1_20=8/5, var_1_21=0, var_1_24=257/2, var_1_26=4, var_1_4=2, var_1_8=0, var_1_9=1] [L20] COND FALSE !(!cond) [L94] RET assume_abort_if_not(var_1_11 <= 0) VAL [isInitial=1, last_1_var_1_24=257/2, last_1_var_1_9=1, var_1_10=-255, var_1_11=0, var_1_12=16, var_1_15=50, var_1_16=1, var_1_17=127/5, var_1_1=128, var_1_20=8/5, var_1_21=0, var_1_24=257/2, var_1_26=4, var_1_4=2, var_1_8=0, var_1_9=1] [L95] var_1_15 = __VERIFIER_nondet_uchar() [L96] CALL assume_abort_if_not(var_1_15 >= 0) VAL [\old(cond)=1, isInitial=1, last_1_var_1_24=257/2, last_1_var_1_9=1, var_1_10=-255, var_1_11=0, var_1_12=16, var_1_16=1, var_1_17=127/5, var_1_1=128, var_1_20=8/5, var_1_21=0, var_1_24=257/2, var_1_26=4, var_1_4=2, var_1_8=0, var_1_9=1] [L20] COND FALSE !(!cond) [L96] RET assume_abort_if_not(var_1_15 >= 0) VAL [isInitial=1, last_1_var_1_24=257/2, last_1_var_1_9=1, var_1_10=-255, var_1_11=0, var_1_12=16, var_1_16=1, var_1_17=127/5, var_1_1=128, var_1_20=8/5, var_1_21=0, var_1_24=257/2, var_1_26=4, var_1_4=2, var_1_8=0, var_1_9=1] [L97] CALL assume_abort_if_not(var_1_15 <= 254) VAL [\old(cond)=1, isInitial=1, last_1_var_1_24=257/2, last_1_var_1_9=1, var_1_10=-255, var_1_11=0, var_1_12=16, var_1_15=-255, var_1_16=1, var_1_17=127/5, var_1_1=128, var_1_20=8/5, var_1_21=0, var_1_24=257/2, var_1_26=4, var_1_4=2, var_1_8=0, var_1_9=1] [L20] COND FALSE !(!cond) [L97] RET assume_abort_if_not(var_1_15 <= 254) VAL [isInitial=1, last_1_var_1_24=257/2, last_1_var_1_9=1, var_1_10=-255, var_1_11=0, var_1_12=16, var_1_15=-255, var_1_16=1, var_1_17=127/5, var_1_1=128, var_1_20=8/5, var_1_21=0, var_1_24=257/2, var_1_26=4, var_1_4=2, var_1_8=0, var_1_9=1] [L98] var_1_20 = __VERIFIER_nondet_float() [L99] CALL assume_abort_if_not((var_1_20 >= -922337.2036854765600e+13F && var_1_20 <= -1.0e-20F) || (var_1_20 <= 9223372.036854765600e+12F && var_1_20 >= 1.0e-20F )) VAL [\old(cond)=1, isInitial=1, last_1_var_1_24=257/2, last_1_var_1_9=1, var_1_10=-255, var_1_11=0, var_1_12=16, var_1_15=-255, var_1_16=1, var_1_17=127/5, var_1_1=128, var_1_21=0, var_1_24=257/2, var_1_26=4, var_1_4=2, var_1_8=0, var_1_9=1] [L20] COND FALSE !(!cond) [L99] RET assume_abort_if_not((var_1_20 >= -922337.2036854765600e+13F && var_1_20 <= -1.0e-20F) || (var_1_20 <= 9223372.036854765600e+12F && var_1_20 >= 1.0e-20F )) VAL [isInitial=1, last_1_var_1_24=257/2, last_1_var_1_9=1, var_1_10=-255, var_1_11=0, var_1_12=16, var_1_15=-255, var_1_16=1, var_1_17=127/5, var_1_1=128, var_1_21=0, var_1_24=257/2, var_1_26=4, var_1_4=2, var_1_8=0, var_1_9=1] [L114] RET updateVariables() [L115] CALL step() [L42] COND FALSE !((last_1_var_1_9 && var_1_11) && (50 > var_1_8)) [L49] var_1_12 = var_1_15 [L51] unsigned char stepLocal_1 = var_1_10; [L52] COND TRUE (var_1_12 != var_1_4) || stepLocal_1 [L53] var_1_9 = var_1_11 [L55] var_1_26 = var_1_12 [L56] var_1_16 = (((((((((256) > (var_1_12)) ? (256) : (var_1_12))) + var_1_12)) < (var_1_15)) ? ((((((256) > (var_1_12)) ? (256) : (var_1_12))) + var_1_12)) : (var_1_15))) [L57] var_1_25 = var_1_20 [L58] COND FALSE !((var_1_9 && var_1_11) && var_1_9) [L61] var_1_21 = ((23370 - var_1_15) + var_1_12) [L63] signed long int stepLocal_2 = -4; [L64] COND FALSE !(! (-4 < var_1_12)) [L67] COND FALSE !(stepLocal_2 > var_1_21) [L71] unsigned short int stepLocal_0 = var_1_16; [L72] COND TRUE ((var_1_16 * var_1_16) / var_1_4) <= stepLocal_0 [L73] var_1_1 = var_1_12 [L77] COND FALSE !((var_1_16 - ((((var_1_1) < 0 ) ? -(var_1_1) : (var_1_1)))) < (var_1_12 - var_1_16)) [L115] RET step() [L116] CALL, EXPR property() [L106-L107] return (((((((((((var_1_16 * var_1_16) / var_1_4) <= var_1_16) ? (var_1_1 == ((unsigned short int) var_1_12)) : (var_1_1 == ((unsigned short int) (var_1_12 + var_1_12)))) && (((var_1_12 != var_1_4) || var_1_10) ? (var_1_9 == ((unsigned char) var_1_11)) : 1)) && (((last_1_var_1_9 && var_1_11) && (50 > var_1_8)) ? (((- last_1_var_1_24) < last_1_var_1_24) ? (last_1_var_1_9 ? (var_1_12 == ((unsigned char) 5)) : 1) : 1) : (var_1_12 == ((unsigned char) var_1_15)))) && (var_1_16 == ((unsigned short int) (((((((((256) > (var_1_12)) ? (256) : (var_1_12))) + var_1_12)) < (var_1_15)) ? ((((((256) > (var_1_12)) ? (256) : (var_1_12))) + var_1_12)) : (var_1_15)))))) && (((var_1_16 - ((((var_1_1) < 0 ) ? -(var_1_1) : (var_1_1)))) < (var_1_12 - var_1_16)) ? (var_1_17 == ((float) var_1_20)) : 1)) && (((var_1_9 && var_1_11) && var_1_9) ? (var_1_21 == ((unsigned short int) (var_1_26 + (var_1_15 + ((((var_1_12) > (var_1_12)) ? (var_1_12) : (var_1_12))))))) : (var_1_21 == ((unsigned short int) ((23370 - var_1_15) + var_1_12))))) && ((! (-4 < var_1_12)) ? (var_1_24 == ((float) var_1_20)) : ((-4 > var_1_21) ? (var_1_24 == ((float) 10.6f)) : 1))) && (var_1_25 == ((double) var_1_20))) && (var_1_26 == ((signed long int) var_1_12)) ; [L116] RET, EXPR property() [L116] CALL __VERIFIER_assert(property()) [L19] COND TRUE !(cond) VAL [isInitial=1, last_1_var_1_24=257/2, last_1_var_1_9=1, var_1_10=-255, var_1_11=0, var_1_12=-255, var_1_15=-255, var_1_16=1, var_1_17=127/5, var_1_1=1, var_1_20=2, var_1_21=23370, var_1_24=257/2, var_1_25=2, var_1_26=1, var_1_4=2, var_1_8=0, var_1_9=0] [L19] reach_error() VAL [isInitial=1, last_1_var_1_24=257/2, last_1_var_1_9=1, var_1_10=-255, var_1_11=0, var_1_12=-255, var_1_15=-255, var_1_16=1, var_1_17=127/5, var_1_1=1, var_1_20=2, var_1_21=23370, var_1_24=257/2, var_1_25=2, var_1_26=1, var_1_4=2, var_1_8=0, var_1_9=0] * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.37ms. Allocated memory is still 130.0MB. Free memory is still 104.2MB. There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 428.74ms. Allocated memory was 130.0MB in the beginning and 163.6MB in the end (delta: 33.6MB). Free memory was 67.4MB in the beginning and 121.8MB in the end (delta: -54.3MB). Peak memory consumption was 5.2MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 75.57ms. Allocated memory is still 163.6MB. Free memory was 121.8MB in the beginning and 118.1MB in the end (delta: 3.7MB). Peak memory consumption was 4.2MB. Max. memory is 16.1GB. * Boogie Preprocessor took 49.31ms. Allocated memory is still 163.6MB. Free memory was 118.1MB in the beginning and 115.9MB in the end (delta: 2.1MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * RCFGBuilder took 825.79ms. Allocated memory is still 163.6MB. Free memory was 115.9MB in the beginning and 79.8MB in the end (delta: 36.1MB). Peak memory consumption was 35.7MB. Max. memory is 16.1GB. * CodeCheck took 831.71ms. Allocated memory is still 163.6MB. Free memory was 79.3MB in the beginning and 102.3MB in the end (delta: -23.0MB). There was no memory consumed. Max. memory is 16.1GB. * Witness Printer took 5.84ms. Allocated memory is still 163.6MB. Free memory is still 102.3MB. There was no memory consumed. Max. memory is 16.1GB. RESULT: Ultimate could not prove your program: unable to determine feasibility of some traces [2024-11-08 19:42:09,694 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6baf67e-2884-419c-8951-8a6c41221f65/bin/ukojak-verify-ImItNfHLgk/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:10000 (1)] Forceful destruction successful, 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: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6baf67e-2884-419c-8951-8a6c41221f65/bin/ukojak-verify-ImItNfHLgk/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6baf67e-2884-419c-8951-8a6c41221f65/bin/ukojak-verify-ImItNfHLgk/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6baf67e-2884-419c-8951-8a6c41221f65/bin/ukojak-verify-ImItNfHLgk/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6baf67e-2884-419c-8951-8a6c41221f65/bin/ukojak-verify-ImItNfHLgk/config/KojakReach.xml -i ../../sv-benchmarks/c/hardness-nfm22/hardness_operatoramount_amount50_file-40.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6baf67e-2884-419c-8951-8a6c41221f65/bin/ukojak-verify-ImItNfHLgk/config/svcomp-Reach-32bit-Kojak_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6baf67e-2884-419c-8951-8a6c41221f65/bin/ukojak-verify-ImItNfHLgk --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Kojak --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash cd267da1d9fa095308e80beee115709feea95ca2b3783ef3fcc417894e57dfd6 --- Real Ultimate output --- This is Ultimate 0.2.5-dev-a016563 [2024-11-08 19:42:12,141 INFO L188 SettingsManager]: Resetting all preferences to default values... [2024-11-08 19:42:12,250 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6baf67e-2884-419c-8951-8a6c41221f65/bin/ukojak-verify-ImItNfHLgk/config/svcomp-Reach-32bit-Kojak_Bitvector.epf [2024-11-08 19:42:12,283 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2024-11-08 19:42:12,284 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2024-11-08 19:42:12,285 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ALWAYS [2024-11-08 19:42:12,286 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2024-11-08 19:42:12,286 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2024-11-08 19:42:12,287 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2024-11-08 19:42:12,288 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2024-11-08 19:42:12,288 INFO L153 SettingsManager]: * sizeof long=4 [2024-11-08 19:42:12,289 INFO L153 SettingsManager]: * sizeof POINTER=4 [2024-11-08 19:42:12,289 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2024-11-08 19:42:12,291 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2024-11-08 19:42:12,292 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2024-11-08 19:42:12,292 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2024-11-08 19:42:12,292 INFO L153 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2024-11-08 19:42:12,293 INFO L153 SettingsManager]: * Use bitvectors instead of ints=true [2024-11-08 19:42:12,293 INFO L153 SettingsManager]: * Allow undefined functions=false [2024-11-08 19:42:12,293 INFO L153 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2024-11-08 19:42:12,294 INFO L153 SettingsManager]: * sizeof long double=12 [2024-11-08 19:42:12,294 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2024-11-08 19:42:12,294 INFO L153 SettingsManager]: * Use constant arrays=true [2024-11-08 19:42:12,295 INFO L151 SettingsManager]: Preferences of CodeCheck differ from their defaults: [2024-11-08 19:42:12,295 INFO L153 SettingsManager]: * Timeout in seconds=1000000 [2024-11-08 19:42:12,295 INFO L153 SettingsManager]: * Theory for external solver=ALL [2024-11-08 19:42:12,296 INFO L153 SettingsManager]: * Command for calling external solver=cvc4 --incremental --print-success --lang smt [2024-11-08 19:42:12,296 INFO L153 SettingsManager]: * Choose which separate solver to use for tracechecks=External_ModelsAndUnsatCoreMode [2024-11-08 19:42:12,296 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2024-11-08 19:42:12,297 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:10000 [2024-11-08 19:42:12,297 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2024-11-08 19:42:12,297 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2024-11-08 19:42:12,298 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2024-11-08 19:42:12,298 INFO L153 SettingsManager]: * Trace refinement strategy=WALRUS [2024-11-08 19:42:12,299 INFO L153 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2024-11-08 19:42:12,299 INFO L153 SettingsManager]: * Use separate solver for trace checks=false [2024-11-08 19:42:12,299 INFO L153 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_d6baf67e-2884-419c-8951-8a6c41221f65/bin/ukojak-verify-ImItNfHLgk/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6baf67e-2884-419c-8951-8a6c41221f65/bin/ukojak-verify-ImItNfHLgk Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Kojak Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> cd267da1d9fa095308e80beee115709feea95ca2b3783ef3fcc417894e57dfd6 [2024-11-08 19:42:12,691 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2024-11-08 19:42:12,727 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2024-11-08 19:42:12,730 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2024-11-08 19:42:12,732 INFO L270 PluginConnector]: Initializing CDTParser... [2024-11-08 19:42:12,733 INFO L274 PluginConnector]: CDTParser initialized [2024-11-08 19:42:12,735 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6baf67e-2884-419c-8951-8a6c41221f65/bin/ukojak-verify-ImItNfHLgk/../../sv-benchmarks/c/hardness-nfm22/hardness_operatoramount_amount50_file-40.i Unable to find full path for "g++" [2024-11-08 19:42:14,823 INFO L533 CDTParser]: Created temporary CDT project at NULL [2024-11-08 19:42:15,085 INFO L384 CDTParser]: Found 1 translation units. [2024-11-08 19:42:15,087 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6baf67e-2884-419c-8951-8a6c41221f65/sv-benchmarks/c/hardness-nfm22/hardness_operatoramount_amount50_file-40.i [2024-11-08 19:42:15,100 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6baf67e-2884-419c-8951-8a6c41221f65/bin/ukojak-verify-ImItNfHLgk/data/2f1869d7a/d64b5bafac5a4fbeb308a054c4e9f875/FLAG936075a8a [2024-11-08 19:42:15,125 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6baf67e-2884-419c-8951-8a6c41221f65/bin/ukojak-verify-ImItNfHLgk/data/2f1869d7a/d64b5bafac5a4fbeb308a054c4e9f875 [2024-11-08 19:42:15,128 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2024-11-08 19:42:15,129 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2024-11-08 19:42:15,130 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2024-11-08 19:42:15,131 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2024-11-08 19:42:15,138 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2024-11-08 19:42:15,139 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 08.11 07:42:15" (1/1) ... [2024-11-08 19:42:15,140 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@60c3beef and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.11 07:42:15, skipping insertion in model container [2024-11-08 19:42:15,140 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 08.11 07:42:15" (1/1) ... [2024-11-08 19:42:15,173 INFO L175 MainTranslator]: Built tables and reachable declarations [2024-11-08 19:42:15,428 WARN L250 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_d6baf67e-2884-419c-8951-8a6c41221f65/sv-benchmarks/c/hardness-nfm22/hardness_operatoramount_amount50_file-40.i[915,928] [2024-11-08 19:42:15,533 INFO L210 PostProcessor]: Analyzing one entry point: main [2024-11-08 19:42:15,557 INFO L200 MainTranslator]: Completed pre-run [2024-11-08 19:42:15,575 WARN L250 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_d6baf67e-2884-419c-8951-8a6c41221f65/sv-benchmarks/c/hardness-nfm22/hardness_operatoramount_amount50_file-40.i[915,928] [2024-11-08 19:42:15,623 INFO L210 PostProcessor]: Analyzing one entry point: main [2024-11-08 19:42:15,659 INFO L204 MainTranslator]: Completed translation [2024-11-08 19:42:15,660 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.11 07:42:15 WrapperNode [2024-11-08 19:42:15,660 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2024-11-08 19:42:15,662 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2024-11-08 19:42:15,662 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2024-11-08 19:42:15,662 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2024-11-08 19:42:15,671 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.11 07:42:15" (1/1) ... [2024-11-08 19:42:15,683 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.11 07:42:15" (1/1) ... [2024-11-08 19:42:15,715 INFO L138 Inliner]: procedures = 27, calls = 25, calls flagged for inlining = 8, calls inlined = 8, statements flattened = 107 [2024-11-08 19:42:15,716 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2024-11-08 19:42:15,716 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2024-11-08 19:42:15,717 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2024-11-08 19:42:15,717 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2024-11-08 19:42:15,729 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.11 07:42:15" (1/1) ... [2024-11-08 19:42:15,731 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.11 07:42:15" (1/1) ... [2024-11-08 19:42:15,738 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.11 07:42:15" (1/1) ... [2024-11-08 19:42:15,739 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.11 07:42:15" (1/1) ... [2024-11-08 19:42:15,749 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.11 07:42:15" (1/1) ... [2024-11-08 19:42:15,753 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.11 07:42:15" (1/1) ... [2024-11-08 19:42:15,755 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.11 07:42:15" (1/1) ... [2024-11-08 19:42:15,757 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.11 07:42:15" (1/1) ... [2024-11-08 19:42:15,760 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2024-11-08 19:42:15,762 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2024-11-08 19:42:15,762 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2024-11-08 19:42:15,762 INFO L274 PluginConnector]: RCFGBuilder initialized [2024-11-08 19:42:15,763 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.11 07:42:15" (1/1) ... [2024-11-08 19:42:15,769 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:10000 [2024-11-08 19:42:15,782 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6baf67e-2884-419c-8951-8a6c41221f65/bin/ukojak-verify-ImItNfHLgk/z3 [2024-11-08 19:42:15,803 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6baf67e-2884-419c-8951-8a6c41221f65/bin/ukojak-verify-ImItNfHLgk/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:10000 (exit command is (exit), workingDir is null) [2024-11-08 19:42:15,816 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6baf67e-2884-419c-8951-8a6c41221f65/bin/ukojak-verify-ImItNfHLgk/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:10000 (1)] Waiting until timeout for monitored process [2024-11-08 19:42:15,845 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2024-11-08 19:42:15,846 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2024-11-08 19:42:15,846 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2024-11-08 19:42:15,846 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2024-11-08 19:42:15,847 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2024-11-08 19:42:15,847 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2024-11-08 19:42:15,950 INFO L238 CfgBuilder]: Building ICFG [2024-11-08 19:42:15,953 INFO L264 CfgBuilder]: Building CFG for each procedure with an implementation [2024-11-08 19:42:16,790 INFO L? ?]: Removed 14 outVars from TransFormulas that were not future-live. [2024-11-08 19:42:16,790 INFO L287 CfgBuilder]: Performing block encoding [2024-11-08 19:42:16,941 INFO L311 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2024-11-08 19:42:16,942 INFO L316 CfgBuilder]: Removed 1 assume(true) statements. [2024-11-08 19:42:16,942 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 08.11 07:42:16 BoogieIcfgContainer [2024-11-08 19:42:16,942 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2024-11-08 19:42:16,943 INFO L112 PluginConnector]: ------------------------CodeCheck---------------------------- [2024-11-08 19:42:16,943 INFO L270 PluginConnector]: Initializing CodeCheck... [2024-11-08 19:42:16,956 INFO L274 PluginConnector]: CodeCheck initialized [2024-11-08 19:42:16,956 INFO L184 PluginConnector]: Executing the observer CodeCheckObserver from plugin CodeCheck for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 08.11 07:42:16" (1/1) ... [2024-11-08 19:42:16,966 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-08 19:42:17,014 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2024-11-08 19:42:17,023 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 27 states and 39 transitions. [2024-11-08 19:42:17,024 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 39 transitions. [2024-11-08 19:42:17,029 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2024-11-08 19:42:17,029 INFO L420 CodeCheckObserver]: Error Path is FOUND. [2024-11-08 19:42:17,029 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2024-11-08 19:42:17,029 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6baf67e-2884-419c-8951-8a6c41221f65/bin/ukojak-verify-ImItNfHLgk/cvc4 [2024-11-08 19:42:17,031 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6baf67e-2884-419c-8951-8a6c41221f65/bin/ukojak-verify-ImItNfHLgk/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2024-11-08 19:42:17,039 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6baf67e-2884-419c-8951-8a6c41221f65/bin/ukojak-verify-ImItNfHLgk/cvc4 --incremental --print-success --lang smt (2)] Waiting until timeout for monitored process [2024-11-08 19:42:17,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-08 19:42:17,929 ERROR L567 CodeCheckObserver]: First Tracecheck threw exception Proofs are not supported [2024-11-08 19:42:18,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-08 19:42:18,279 INFO L255 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 21 conjuncts are in the unsatisfiable core [2024-11-08 19:42:18,290 INFO L278 TraceCheckSpWp]: Computing forward predicates...