./Ultimate.py --spec ../../sv-benchmarks/c/properties/no-overflow.prp --file ../../sv-benchmarks/c/Juliet_Test/CWE190_Integer_Overflow__int_rand_multiply_01_bad.i --full-output --architecture 64bit -------------------------------------------------------------------------------- Checking for overflows Using default analysis Version 826ab2ba Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aea414ea-b25b-4d6a-acea-5c5f4428b9ca/bin/ukojak-verify-EEHR8qb7sm/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aea414ea-b25b-4d6a-acea-5c5f4428b9ca/bin/ukojak-verify-EEHR8qb7sm/plugins/org.eclipse.equinox.launcher_1.6.800.v20240513-1750.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aea414ea-b25b-4d6a-acea-5c5f4428b9ca/bin/ukojak-verify-EEHR8qb7sm/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aea414ea-b25b-4d6a-acea-5c5f4428b9ca/bin/ukojak-verify-EEHR8qb7sm/config/KojakReach.xml -i ../../sv-benchmarks/c/Juliet_Test/CWE190_Integer_Overflow__int_rand_multiply_01_bad.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aea414ea-b25b-4d6a-acea-5c5f4428b9ca/bin/ukojak-verify-EEHR8qb7sm/config/svcomp-Overflow-64bit-Kojak_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aea414ea-b25b-4d6a-acea-5c5f4428b9ca/bin/ukojak-verify-EEHR8qb7sm --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! overflow) ) --witnessprinter.graph.data.producer Kojak --witnessprinter.graph.data.architecture 64bit --witnessprinter.graph.data.programhash d1b91f5546a335ee4695e7ee04893df065cc54c359ef7a5d8bb7a68157a591f3 --- Real Ultimate output --- This is Ultimate 0.3.0-dev-826ab2b [2024-11-13 20:49:15,826 INFO L188 SettingsManager]: Resetting all preferences to default values... [2024-11-13 20:49:15,936 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aea414ea-b25b-4d6a-acea-5c5f4428b9ca/bin/ukojak-verify-EEHR8qb7sm/config/svcomp-Overflow-64bit-Kojak_Default.epf [2024-11-13 20:49:15,945 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2024-11-13 20:49:15,947 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.plugins.generator.codecheck.Interpolating solver [2024-11-13 20:49:15,986 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2024-11-13 20:49:15,986 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2024-11-13 20:49:15,988 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ALWAYS [2024-11-13 20:49:15,989 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2024-11-13 20:49:15,989 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2024-11-13 20:49:15,989 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2024-11-13 20:49:15,989 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2024-11-13 20:49:15,989 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2024-11-13 20:49:15,990 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2024-11-13 20:49:15,990 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2024-11-13 20:49:15,990 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2024-11-13 20:49:15,990 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2024-11-13 20:49:15,990 INFO L153 SettingsManager]: * Allow undefined functions=false [2024-11-13 20:49:15,990 INFO L153 SettingsManager]: * Check absence of signed integer overflows=ASSERTandASSUME [2024-11-13 20:49:15,990 INFO L153 SettingsManager]: * Check unreachability of reach_error function=false [2024-11-13 20:49:15,990 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2024-11-13 20:49:15,990 INFO L153 SettingsManager]: * Use constant arrays=true [2024-11-13 20:49:15,990 INFO L151 SettingsManager]: Preferences of CodeCheck differ from their defaults: [2024-11-13 20:49:15,991 INFO L153 SettingsManager]: * Timeout in seconds=1000000 [2024-11-13 20:49:15,991 INFO L153 SettingsManager]: * Theory for external solver=ALL [2024-11-13 20:49:15,991 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2024-11-13 20:49:15,991 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:10000 [2024-11-13 20:49:15,991 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2024-11-13 20:49:15,991 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2024-11-13 20:49:15,991 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2024-11-13 20:49:15,991 INFO L153 SettingsManager]: * Trace refinement strategy=PENGUIN [2024-11-13 20:49:15,992 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2024-11-13 20:49:15,992 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode 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_aea414ea-b25b-4d6a-acea-5c5f4428b9ca/bin/ukojak-verify-EEHR8qb7sm 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 ! overflow) ) 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 -> 64bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> d1b91f5546a335ee4695e7ee04893df065cc54c359ef7a5d8bb7a68157a591f3 [2024-11-13 20:49:16,309 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2024-11-13 20:49:16,318 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2024-11-13 20:49:16,320 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2024-11-13 20:49:16,322 INFO L270 PluginConnector]: Initializing CDTParser... [2024-11-13 20:49:16,322 INFO L274 PluginConnector]: CDTParser initialized [2024-11-13 20:49:16,324 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aea414ea-b25b-4d6a-acea-5c5f4428b9ca/bin/ukojak-verify-EEHR8qb7sm/../../sv-benchmarks/c/Juliet_Test/CWE190_Integer_Overflow__int_rand_multiply_01_bad.i Unable to find full path for "g++" [2024-11-13 20:49:18,220 INFO L533 CDTParser]: Created temporary CDT project at NULL [2024-11-13 20:49:18,721 INFO L384 CDTParser]: Found 1 translation units. [2024-11-13 20:49:18,722 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aea414ea-b25b-4d6a-acea-5c5f4428b9ca/sv-benchmarks/c/Juliet_Test/CWE190_Integer_Overflow__int_rand_multiply_01_bad.i [2024-11-13 20:49:18,747 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aea414ea-b25b-4d6a-acea-5c5f4428b9ca/bin/ukojak-verify-EEHR8qb7sm/data/eee8f9444/9bf32810d6244132bde8759614c94082/FLAG9218b7f4a [2024-11-13 20:49:18,774 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aea414ea-b25b-4d6a-acea-5c5f4428b9ca/bin/ukojak-verify-EEHR8qb7sm/data/eee8f9444/9bf32810d6244132bde8759614c94082 [2024-11-13 20:49:18,776 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2024-11-13 20:49:18,778 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2024-11-13 20:49:18,779 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2024-11-13 20:49:18,779 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2024-11-13 20:49:18,782 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2024-11-13 20:49:18,783 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.11 08:49:18" (1/1) ... [2024-11-13 20:49:18,784 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5d2cb68d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 08:49:18, skipping insertion in model container [2024-11-13 20:49:18,784 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.11 08:49:18" (1/1) ... [2024-11-13 20:49:18,837 INFO L175 MainTranslator]: Built tables and reachable declarations [2024-11-13 20:49:19,877 INFO L210 PostProcessor]: Analyzing one entry point: main [2024-11-13 20:49:19,887 INFO L200 MainTranslator]: Completed pre-run [2024-11-13 20:49:19,978 INFO L210 PostProcessor]: Analyzing one entry point: main [2024-11-13 20:49:20,103 INFO L204 MainTranslator]: Completed translation [2024-11-13 20:49:20,104 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 08:49:20 WrapperNode [2024-11-13 20:49:20,104 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2024-11-13 20:49:20,105 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2024-11-13 20:49:20,105 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2024-11-13 20:49:20,106 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2024-11-13 20:49:20,112 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 08:49:20" (1/1) ... [2024-11-13 20:49:20,131 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 08:49:20" (1/1) ... [2024-11-13 20:49:20,153 INFO L138 Inliner]: procedures = 497, calls = 23, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 97 [2024-11-13 20:49:20,154 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2024-11-13 20:49:20,155 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2024-11-13 20:49:20,155 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2024-11-13 20:49:20,155 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2024-11-13 20:49:20,162 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 08:49:20" (1/1) ... [2024-11-13 20:49:20,163 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 08:49:20" (1/1) ... [2024-11-13 20:49:20,165 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 08:49:20" (1/1) ... [2024-11-13 20:49:20,166 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 08:49:20" (1/1) ... [2024-11-13 20:49:20,171 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 08:49:20" (1/1) ... [2024-11-13 20:49:20,173 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 08:49:20" (1/1) ... [2024-11-13 20:49:20,174 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 08:49:20" (1/1) ... [2024-11-13 20:49:20,175 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 08:49:20" (1/1) ... [2024-11-13 20:49:20,178 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2024-11-13 20:49:20,179 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2024-11-13 20:49:20,179 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2024-11-13 20:49:20,179 INFO L274 PluginConnector]: RCFGBuilder initialized [2024-11-13 20:49:20,180 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 08:49:20" (1/1) ... [2024-11-13 20:49:20,186 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:10000 [2024-11-13 20:49:20,200 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aea414ea-b25b-4d6a-acea-5c5f4428b9ca/bin/ukojak-verify-EEHR8qb7sm/z3 [2024-11-13 20:49:20,221 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aea414ea-b25b-4d6a-acea-5c5f4428b9ca/bin/ukojak-verify-EEHR8qb7sm/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:10000 (exit command is (exit), workingDir is null) [2024-11-13 20:49:20,226 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aea414ea-b25b-4d6a-acea-5c5f4428b9ca/bin/ukojak-verify-EEHR8qb7sm/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:10000 (1)] Waiting until timeout for monitored process [2024-11-13 20:49:20,255 INFO L130 BoogieDeclarations]: Found specification of procedure printLine [2024-11-13 20:49:20,255 INFO L138 BoogieDeclarations]: Found implementation of procedure printLine [2024-11-13 20:49:20,255 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2024-11-13 20:49:20,255 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2024-11-13 20:49:20,255 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2024-11-13 20:49:20,437 INFO L238 CfgBuilder]: Building ICFG [2024-11-13 20:49:20,439 INFO L264 CfgBuilder]: Building CFG for each procedure with an implementation [2024-11-13 20:49:20,650 INFO L? ?]: Removed 57 outVars from TransFormulas that were not future-live. [2024-11-13 20:49:20,650 INFO L287 CfgBuilder]: Performing block encoding [2024-11-13 20:49:20,884 INFO L311 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2024-11-13 20:49:20,884 INFO L316 CfgBuilder]: Removed 0 assume(true) statements. [2024-11-13 20:49:20,885 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.11 08:49:20 BoogieIcfgContainer [2024-11-13 20:49:20,885 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2024-11-13 20:49:20,886 INFO L112 PluginConnector]: ------------------------CodeCheck---------------------------- [2024-11-13 20:49:20,886 INFO L270 PluginConnector]: Initializing CodeCheck... [2024-11-13 20:49:20,899 INFO L274 PluginConnector]: CodeCheck initialized [2024-11-13 20:49:20,900 INFO L184 PluginConnector]: Executing the observer CodeCheckObserver from plugin CodeCheck for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.11 08:49:20" (1/1) ... [2024-11-13 20:49:20,911 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-13 20:49:20,961 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2024-11-13 20:49:20,972 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 14 states and 15 transitions. [2024-11-13 20:49:20,972 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2024-11-13 20:49:20,976 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2024-11-13 20:49:20,976 INFO L420 CodeCheckObserver]: Error Path is FOUND. [2024-11-13 20:49:20,977 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-13 20:49:21,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-13 20:49:21,373 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-13 20:49:21,425 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2024-11-13 20:49:21,426 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 13 states and 14 transitions. [2024-11-13 20:49:21,427 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2024-11-13 20:49:21,427 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2024-11-13 20:49:21,427 INFO L420 CodeCheckObserver]: Error Path is FOUND. [2024-11-13 20:49:21,427 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-13 20:49:21,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2024-11-13 20:49:21,685 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2024-11-13 20:49:21,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2024-11-13 20:49:21,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2024-11-13 20:49:21,847 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2024-11-13 20:49:21,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2024-11-13 20:49:21,899 WARN L473 CodeCheckObserver]: This program is UNSAFE, Check terminated with 2 iterations. [2024-11-13 20:49:21,937 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.codecheck CFG 13.11 08:49:21 ImpRootNode [2024-11-13 20:49:21,938 INFO L131 PluginConnector]: ------------------------ END CodeCheck---------------------------- [2024-11-13 20:49:21,939 INFO L112 PluginConnector]: ------------------------Witness Printer---------------------------- [2024-11-13 20:49:21,939 INFO L270 PluginConnector]: Initializing Witness Printer... [2024-11-13 20:49:21,939 INFO L274 PluginConnector]: Witness Printer initialized [2024-11-13 20:49:21,941 INFO L184 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.11 08:49:20" (3/4) ... [2024-11-13 20:49:21,944 INFO L145 WitnessPrinter]: No result that supports witness generation found [2024-11-13 20:49:21,945 INFO L131 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2024-11-13 20:49:21,946 INFO L158 Benchmark]: Toolchain (without parser) took 3168.00ms. Allocated memory is still 142.6MB. Free memory was 116.0MB in the beginning and 93.5MB in the end (delta: 22.5MB). Peak memory consumption was 26.4MB. Max. memory is 16.1GB. [2024-11-13 20:49:21,949 INFO L158 Benchmark]: CDTParser took 0.38ms. Allocated memory is still 167.8MB. Free memory is still 105.3MB. There was no memory consumed. Max. memory is 16.1GB. [2024-11-13 20:49:21,949 INFO L158 Benchmark]: CACSL2BoogieTranslator took 1325.65ms. Allocated memory is still 142.6MB. Free memory was 115.7MB in the beginning and 57.0MB in the end (delta: 58.7MB). Peak memory consumption was 58.7MB. Max. memory is 16.1GB. [2024-11-13 20:49:21,949 INFO L158 Benchmark]: Boogie Procedure Inliner took 48.81ms. Allocated memory is still 142.6MB. Free memory was 57.0MB in the beginning and 54.4MB in the end (delta: 2.6MB). There was no memory consumed. Max. memory is 16.1GB. [2024-11-13 20:49:21,950 INFO L158 Benchmark]: Boogie Preprocessor took 23.40ms. Allocated memory is still 142.6MB. Free memory was 54.4MB in the beginning and 53.0MB in the end (delta: 1.4MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. [2024-11-13 20:49:21,950 INFO L158 Benchmark]: RCFGBuilder took 706.36ms. Allocated memory is still 142.6MB. Free memory was 53.0MB in the beginning and 85.4MB in the end (delta: -32.3MB). Peak memory consumption was 14.0MB. Max. memory is 16.1GB. [2024-11-13 20:49:21,951 INFO L158 Benchmark]: CodeCheck took 1052.52ms. Allocated memory is still 142.6MB. Free memory was 85.4MB in the beginning and 93.5MB in the end (delta: -8.1MB). There was no memory consumed. Max. memory is 16.1GB. [2024-11-13 20:49:21,951 INFO L158 Benchmark]: Witness Printer took 6.04ms. Allocated memory is still 142.6MB. Free memory was 93.5MB in the beginning and 93.5MB in the end (delta: 13.7kB). There was no memory consumed. Max. memory is 16.1GB. [2024-11-13 20:49:21,955 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, 14 locations, 2 error locations. Started 1 CEGAR loops. OverallTime: 1.0s, OverallIterations: 2, TraceHistogramMax: 0, PathProgramHistogramMax: 0, EmptinessCheckTime: 0.0s, AutomataDifference: 0.0s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 0 mSolverCounterUnknown, 14 SdHoareTripleChecker+Valid, 0.0s IncrementalHoareTripleChecker+Time, 0 mSdLazyCounter, 0 mSDsluCounter, 6 SdHoareTripleChecker+Invalid, 0.0s Time, 0 mProtectedAction, 0 SdHoareTripleChecker+Unchecked, 0 IncrementalHoareTripleChecker+Unchecked, 0 mSDsCounter, 2 IncrementalHoareTripleChecker+Valid, 0 mProtectedPredicate, 7 IncrementalHoareTripleChecker+Invalid, 9 SdHoareTripleChecker+Unknown, 0 mSolverCounterNotChecked, 2 mSolverCounterUnsat, 6 mSDtfsCounter, 7 mSolverCounterSat, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Unknown, PredicateUnifierStatistics: 0 DeclaredPredicates, 42 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 2 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, 0.2s InterpolantComputationTime, 15 NumberOfCodeBlocks, 15 NumberOfCodeBlocksAsserted, 2 NumberOfCheckSat, 6 ConstructedInterpolants, 0 QuantifiedInterpolants, 8 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 1 InterpolantComputations, 1 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: 1555]: Unable to prove that integer overflow can never occur Unable to prove that integer overflow can never occur Reason: overapproximation of large string literal at line 1562, overapproximation of bitwiseOr at line 1552. Possible FailurePath: [L1522] const int GLOBAL_CONST_TRUE = 1; [L1523] const int GLOBAL_CONST_FALSE = 0; [L1524] const int GLOBAL_CONST_FIVE = 5; [L1525] int globalTrue = 1; [L1526] int globalFalse = 0; [L1527] int globalFive = 5; [L1546] int globalArgc = 0; [L1547] char** globalArgv = ((void *)0); [L1562] CALL printLine("Calling bad()...") VAL [GLOBAL_CONST_FALSE=0, GLOBAL_CONST_FIVE=5, GLOBAL_CONST_TRUE=1, \old(line)={1:0}, globalArgc=0, globalArgv={0:0}, globalFalse=0, globalFive=5, globalTrue=1] [L1414] COND TRUE line != ((void *)0) [L1562] RET printLine("Calling bad()...") VAL [GLOBAL_CONST_FALSE=0, GLOBAL_CONST_FIVE=5, GLOBAL_CONST_TRUE=1, globalArgc=0, globalArgv={0:0}, globalFalse=0, globalFive=5, globalTrue=1] [L1563] CALL CWE190_Integer_Overflow__int_rand_multiply_01_bad() [L1550] int data; [L1551] data = 0 [L1552] EXPR rand() & 1 ? (((unsigned)rand()<<30) ^ ((unsigned)rand()<<15) ^ rand()) : -(((unsigned)rand()<<30) ^ ((unsigned)rand()<<15) ^ rand()) - 1 [L1552] EXPR ((unsigned)rand()<<30) ^ ((unsigned)rand()<<15) [L1552] EXPR ((unsigned)rand()<<30) ^ ((unsigned)rand()<<15) ^ rand() [L1552] EXPR rand() & 1 ? (((unsigned)rand()<<30) ^ ((unsigned)rand()<<15) ^ rand()) : -(((unsigned)rand()<<30) ^ ((unsigned)rand()<<15) ^ rand()) - 1 [L1552] data = ((int)(rand() & 1 ? (((unsigned)rand()<<30) ^ ((unsigned)rand()<<15) ^ rand()) : -(((unsigned)rand()<<30) ^ ((unsigned)rand()<<15) ^ rand()) - 1)) [L1553] COND TRUE data > 0 VAL [GLOBAL_CONST_FALSE=0, GLOBAL_CONST_FIVE=5, GLOBAL_CONST_TRUE=1, data=1073741824, globalArgc=0, globalArgv={0:0}, globalFalse=0, globalFive=5, globalTrue=1] [L1555] data * 2 VAL [GLOBAL_CONST_FALSE=0, GLOBAL_CONST_FIVE=5, GLOBAL_CONST_TRUE=1, globalArgc=0, globalArgv={0:0}, globalFalse=0, globalFive=5, globalTrue=1] * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.38ms. Allocated memory is still 167.8MB. Free memory is still 105.3MB. There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 1325.65ms. Allocated memory is still 142.6MB. Free memory was 115.7MB in the beginning and 57.0MB in the end (delta: 58.7MB). Peak memory consumption was 58.7MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 48.81ms. Allocated memory is still 142.6MB. Free memory was 57.0MB in the beginning and 54.4MB in the end (delta: 2.6MB). There was no memory consumed. Max. memory is 16.1GB. * Boogie Preprocessor took 23.40ms. Allocated memory is still 142.6MB. Free memory was 54.4MB in the beginning and 53.0MB in the end (delta: 1.4MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. * RCFGBuilder took 706.36ms. Allocated memory is still 142.6MB. Free memory was 53.0MB in the beginning and 85.4MB in the end (delta: -32.3MB). Peak memory consumption was 14.0MB. Max. memory is 16.1GB. * CodeCheck took 1052.52ms. Allocated memory is still 142.6MB. Free memory was 85.4MB in the beginning and 93.5MB in the end (delta: -8.1MB). There was no memory consumed. Max. memory is 16.1GB. * Witness Printer took 6.04ms. Allocated memory is still 142.6MB. Free memory was 93.5MB in the beginning and 93.5MB in the end (delta: 13.7kB). There was no memory consumed. Max. memory is 16.1GB. RESULT: Ultimate could not prove your program: unable to determine feasibility of some traces [2024-11-13 20:49:21,992 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aea414ea-b25b-4d6a-acea-5c5f4428b9ca/bin/ukojak-verify-EEHR8qb7sm/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:10000 (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: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aea414ea-b25b-4d6a-acea-5c5f4428b9ca/bin/ukojak-verify-EEHR8qb7sm/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aea414ea-b25b-4d6a-acea-5c5f4428b9ca/bin/ukojak-verify-EEHR8qb7sm/plugins/org.eclipse.equinox.launcher_1.6.800.v20240513-1750.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aea414ea-b25b-4d6a-acea-5c5f4428b9ca/bin/ukojak-verify-EEHR8qb7sm/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aea414ea-b25b-4d6a-acea-5c5f4428b9ca/bin/ukojak-verify-EEHR8qb7sm/config/KojakReach.xml -i ../../sv-benchmarks/c/Juliet_Test/CWE190_Integer_Overflow__int_rand_multiply_01_bad.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aea414ea-b25b-4d6a-acea-5c5f4428b9ca/bin/ukojak-verify-EEHR8qb7sm/config/svcomp-Overflow-64bit-Kojak_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aea414ea-b25b-4d6a-acea-5c5f4428b9ca/bin/ukojak-verify-EEHR8qb7sm --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! overflow) ) --witnessprinter.graph.data.producer Kojak --witnessprinter.graph.data.architecture 64bit --witnessprinter.graph.data.programhash d1b91f5546a335ee4695e7ee04893df065cc54c359ef7a5d8bb7a68157a591f3 --- Real Ultimate output --- This is Ultimate 0.3.0-dev-826ab2b [2024-11-13 20:49:24,744 INFO L188 SettingsManager]: Resetting all preferences to default values... [2024-11-13 20:49:24,858 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aea414ea-b25b-4d6a-acea-5c5f4428b9ca/bin/ukojak-verify-EEHR8qb7sm/config/svcomp-Overflow-64bit-Kojak_Bitvector.epf [2024-11-13 20:49:24,919 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2024-11-13 20:49:24,920 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2024-11-13 20:49:24,920 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ALWAYS [2024-11-13 20:49:24,921 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2024-11-13 20:49:24,921 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2024-11-13 20:49:24,922 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2024-11-13 20:49:24,922 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2024-11-13 20:49:24,923 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2024-11-13 20:49:24,924 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2024-11-13 20:49:24,924 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2024-11-13 20:49:24,924 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2024-11-13 20:49:24,924 INFO L153 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2024-11-13 20:49:24,924 INFO L153 SettingsManager]: * Use bitvectors instead of ints=true [2024-11-13 20:49:24,924 INFO L153 SettingsManager]: * Allow undefined functions=false [2024-11-13 20:49:24,924 INFO L153 SettingsManager]: * Check absence of signed integer overflows=ASSERTandASSUME [2024-11-13 20:49:24,924 INFO L153 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2024-11-13 20:49:24,924 INFO L153 SettingsManager]: * Check unreachability of reach_error function=false [2024-11-13 20:49:24,924 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2024-11-13 20:49:24,924 INFO L153 SettingsManager]: * Use constant arrays=true [2024-11-13 20:49:24,925 INFO L151 SettingsManager]: Preferences of CodeCheck differ from their defaults: [2024-11-13 20:49:24,925 INFO L153 SettingsManager]: * Timeout in seconds=1000000 [2024-11-13 20:49:24,925 INFO L153 SettingsManager]: * Theory for external solver=ALL [2024-11-13 20:49:24,925 INFO L153 SettingsManager]: * Command for calling external solver=cvc4 --incremental --print-success --lang smt [2024-11-13 20:49:24,925 INFO L153 SettingsManager]: * Choose which separate solver to use for tracechecks=External_ModelsAndUnsatCoreMode [2024-11-13 20:49:24,925 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2024-11-13 20:49:24,925 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:10000 [2024-11-13 20:49:24,925 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2024-11-13 20:49:24,925 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2024-11-13 20:49:24,925 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2024-11-13 20:49:24,925 INFO L153 SettingsManager]: * Trace refinement strategy=WALRUS [2024-11-13 20:49:24,925 INFO L153 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2024-11-13 20:49:24,926 INFO L153 SettingsManager]: * Use separate solver for trace checks=false [2024-11-13 20:49:24,926 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode 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_aea414ea-b25b-4d6a-acea-5c5f4428b9ca/bin/ukojak-verify-EEHR8qb7sm 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 ! overflow) ) 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 -> 64bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> d1b91f5546a335ee4695e7ee04893df065cc54c359ef7a5d8bb7a68157a591f3 [2024-11-13 20:49:25,218 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2024-11-13 20:49:25,227 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2024-11-13 20:49:25,230 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2024-11-13 20:49:25,231 INFO L270 PluginConnector]: Initializing CDTParser... [2024-11-13 20:49:25,232 INFO L274 PluginConnector]: CDTParser initialized [2024-11-13 20:49:25,233 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aea414ea-b25b-4d6a-acea-5c5f4428b9ca/bin/ukojak-verify-EEHR8qb7sm/../../sv-benchmarks/c/Juliet_Test/CWE190_Integer_Overflow__int_rand_multiply_01_bad.i Unable to find full path for "g++" [2024-11-13 20:49:27,188 INFO L533 CDTParser]: Created temporary CDT project at NULL [2024-11-13 20:49:27,777 INFO L384 CDTParser]: Found 1 translation units. [2024-11-13 20:49:27,777 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aea414ea-b25b-4d6a-acea-5c5f4428b9ca/sv-benchmarks/c/Juliet_Test/CWE190_Integer_Overflow__int_rand_multiply_01_bad.i [2024-11-13 20:49:27,824 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aea414ea-b25b-4d6a-acea-5c5f4428b9ca/bin/ukojak-verify-EEHR8qb7sm/data/655099c9f/75dcde68c63142b5be54c75f3ef50e87/FLAG6bbaf511f [2024-11-13 20:49:27,853 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aea414ea-b25b-4d6a-acea-5c5f4428b9ca/bin/ukojak-verify-EEHR8qb7sm/data/655099c9f/75dcde68c63142b5be54c75f3ef50e87 [2024-11-13 20:49:27,858 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2024-11-13 20:49:27,860 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2024-11-13 20:49:27,865 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2024-11-13 20:49:27,865 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2024-11-13 20:49:27,872 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2024-11-13 20:49:27,873 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.11 08:49:27" (1/1) ... [2024-11-13 20:49:27,877 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6ace2a83 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 08:49:27, skipping insertion in model container [2024-11-13 20:49:27,877 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.11 08:49:27" (1/1) ... [2024-11-13 20:49:27,958 INFO L175 MainTranslator]: Built tables and reachable declarations [2024-11-13 20:49:29,030 INFO L210 PostProcessor]: Analyzing one entry point: main [2024-11-13 20:49:29,049 INFO L200 MainTranslator]: Completed pre-run [2024-11-13 20:49:29,188 INFO L210 PostProcessor]: Analyzing one entry point: main [2024-11-13 20:49:29,348 INFO L204 MainTranslator]: Completed translation [2024-11-13 20:49:29,348 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 08:49:29 WrapperNode [2024-11-13 20:49:29,349 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2024-11-13 20:49:29,349 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2024-11-13 20:49:29,349 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2024-11-13 20:49:29,350 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2024-11-13 20:49:29,355 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 08:49:29" (1/1) ... [2024-11-13 20:49:29,388 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 08:49:29" (1/1) ... [2024-11-13 20:49:29,415 INFO L138 Inliner]: procedures = 502, calls = 23, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 57 [2024-11-13 20:49:29,416 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2024-11-13 20:49:29,416 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2024-11-13 20:49:29,416 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2024-11-13 20:49:29,417 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2024-11-13 20:49:29,423 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 08:49:29" (1/1) ... [2024-11-13 20:49:29,423 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 08:49:29" (1/1) ... [2024-11-13 20:49:29,427 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 08:49:29" (1/1) ... [2024-11-13 20:49:29,427 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 08:49:29" (1/1) ... [2024-11-13 20:49:29,435 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 08:49:29" (1/1) ... [2024-11-13 20:49:29,437 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 08:49:29" (1/1) ... [2024-11-13 20:49:29,440 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 08:49:29" (1/1) ... [2024-11-13 20:49:29,441 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 08:49:29" (1/1) ... [2024-11-13 20:49:29,448 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2024-11-13 20:49:29,448 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2024-11-13 20:49:29,448 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2024-11-13 20:49:29,449 INFO L274 PluginConnector]: RCFGBuilder initialized [2024-11-13 20:49:29,449 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 08:49:29" (1/1) ... [2024-11-13 20:49:29,458 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:10000 [2024-11-13 20:49:29,497 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aea414ea-b25b-4d6a-acea-5c5f4428b9ca/bin/ukojak-verify-EEHR8qb7sm/z3 [2024-11-13 20:49:29,511 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aea414ea-b25b-4d6a-acea-5c5f4428b9ca/bin/ukojak-verify-EEHR8qb7sm/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:10000 (exit command is (exit), workingDir is null) [2024-11-13 20:49:29,516 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aea414ea-b25b-4d6a-acea-5c5f4428b9ca/bin/ukojak-verify-EEHR8qb7sm/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:10000 (1)] Waiting until timeout for monitored process [2024-11-13 20:49:29,544 INFO L130 BoogieDeclarations]: Found specification of procedure printLine [2024-11-13 20:49:29,544 INFO L138 BoogieDeclarations]: Found implementation of procedure printLine [2024-11-13 20:49:29,545 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2024-11-13 20:49:29,545 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2024-11-13 20:49:29,545 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2024-11-13 20:49:29,760 INFO L238 CfgBuilder]: Building ICFG [2024-11-13 20:49:29,763 INFO L264 CfgBuilder]: Building CFG for each procedure with an implementation [2024-11-13 20:49:29,895 INFO L? ?]: Removed 29 outVars from TransFormulas that were not future-live. [2024-11-13 20:49:29,896 INFO L287 CfgBuilder]: Performing block encoding [2024-11-13 20:49:29,959 INFO L311 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2024-11-13 20:49:29,962 INFO L316 CfgBuilder]: Removed 0 assume(true) statements. [2024-11-13 20:49:29,963 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.11 08:49:29 BoogieIcfgContainer [2024-11-13 20:49:29,963 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2024-11-13 20:49:29,964 INFO L112 PluginConnector]: ------------------------CodeCheck---------------------------- [2024-11-13 20:49:29,964 INFO L270 PluginConnector]: Initializing CodeCheck... [2024-11-13 20:49:29,974 INFO L274 PluginConnector]: CodeCheck initialized [2024-11-13 20:49:29,975 INFO L184 PluginConnector]: Executing the observer CodeCheckObserver from plugin CodeCheck for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.11 08:49:29" (1/1) ... [2024-11-13 20:49:29,984 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-13 20:49:30,023 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2024-11-13 20:49:30,032 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 14 states and 15 transitions. [2024-11-13 20:49:30,033 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2024-11-13 20:49:30,037 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2024-11-13 20:49:30,037 INFO L420 CodeCheckObserver]: Error Path is FOUND. [2024-11-13 20:49:30,038 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2024-11-13 20:49:30,038 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aea414ea-b25b-4d6a-acea-5c5f4428b9ca/bin/ukojak-verify-EEHR8qb7sm/cvc4 [2024-11-13 20:49:30,043 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aea414ea-b25b-4d6a-acea-5c5f4428b9ca/bin/ukojak-verify-EEHR8qb7sm/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2024-11-13 20:49:30,045 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aea414ea-b25b-4d6a-acea-5c5f4428b9ca/bin/ukojak-verify-EEHR8qb7sm/cvc4 --incremental --print-success --lang smt (2)] Waiting until timeout for monitored process [2024-11-13 20:49:30,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-13 20:49:30,252 ERROR L567 CodeCheckObserver]: First Tracecheck threw exception Proofs are not supported [2024-11-13 20:49:30,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-13 20:49:30,297 INFO L255 TraceCheckSpWp]: Trace formula consists of 31 conjuncts, 2 conjuncts are in the unsatisfiable core [2024-11-13 20:49:30,302 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-13 20:49:30,342 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-13 20:49:30,345 ERROR L418 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aea414ea-b25b-4d6a-acea-5c5f4428b9ca/bin/ukojak-verify-EEHR8qb7sm/cvc4 --incremental --print-success --lang smt (2)] Exception during sending of exit command (exit): Broken pipe [2024-11-13 20:49:30,345 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aea414ea-b25b-4d6a-acea-5c5f4428b9ca/bin/ukojak-verify-EEHR8qb7sm/cvc4 --incremental --print-success --lang smt (2)] Ended with exit code 0 [2024-11-13 20:49:30,400 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2024-11-13 20:49:30,402 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 13 states and 14 transitions. [2024-11-13 20:49:30,402 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2024-11-13 20:49:30,403 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2024-11-13 20:49:30,403 INFO L420 CodeCheckObserver]: Error Path is FOUND. [2024-11-13 20:49:30,403 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2024-11-13 20:49:30,403 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aea414ea-b25b-4d6a-acea-5c5f4428b9ca/bin/ukojak-verify-EEHR8qb7sm/cvc4 [2024-11-13 20:49:30,405 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aea414ea-b25b-4d6a-acea-5c5f4428b9ca/bin/ukojak-verify-EEHR8qb7sm/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2024-11-13 20:49:30,408 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aea414ea-b25b-4d6a-acea-5c5f4428b9ca/bin/ukojak-verify-EEHR8qb7sm/cvc4 --incremental --print-success --lang smt (3)] Waiting until timeout for monitored process [2024-11-13 20:49:30,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2024-11-13 20:49:30,574 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2024-11-13 20:49:30,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2024-11-13 20:49:30,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2024-11-13 20:49:30,727 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2024-11-13 20:49:30,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2024-11-13 20:49:30,776 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aea414ea-b25b-4d6a-acea-5c5f4428b9ca/bin/ukojak-verify-EEHR8qb7sm/cvc4 --incremental --print-success --lang smt (3)] Ended with exit code 0 [2024-11-13 20:49:30,777 WARN L473 CodeCheckObserver]: This program is UNSAFE, Check terminated with 2 iterations. [2024-11-13 20:49:30,811 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.codecheck CFG 13.11 08:49:30 ImpRootNode [2024-11-13 20:49:30,812 INFO L131 PluginConnector]: ------------------------ END CodeCheck---------------------------- [2024-11-13 20:49:30,812 INFO L112 PluginConnector]: ------------------------Witness Printer---------------------------- [2024-11-13 20:49:30,813 INFO L270 PluginConnector]: Initializing Witness Printer... [2024-11-13 20:49:30,813 INFO L274 PluginConnector]: Witness Printer initialized [2024-11-13 20:49:30,813 INFO L184 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.11 08:49:29" (3/4) ... [2024-11-13 20:49:30,817 INFO L145 WitnessPrinter]: No result that supports witness generation found [2024-11-13 20:49:30,818 INFO L131 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2024-11-13 20:49:30,821 INFO L158 Benchmark]: Toolchain (without parser) took 2958.75ms. Allocated memory is still 100.7MB. Free memory was 74.7MB in the beginning and 64.9MB in the end (delta: 9.8MB). Peak memory consumption was 11.7MB. Max. memory is 16.1GB. [2024-11-13 20:49:30,821 INFO L158 Benchmark]: CDTParser took 0.43ms. Allocated memory is still 83.9MB. Free memory was 49.9MB in the beginning and 49.8MB in the end (delta: 107.8kB). There was no memory consumed. Max. memory is 16.1GB. [2024-11-13 20:49:30,822 INFO L158 Benchmark]: CACSL2BoogieTranslator took 1484.36ms. Allocated memory is still 100.7MB. Free memory was 74.5MB in the beginning and 45.4MB in the end (delta: 29.1MB). Peak memory consumption was 49.8MB. Max. memory is 16.1GB. [2024-11-13 20:49:30,822 INFO L158 Benchmark]: Boogie Procedure Inliner took 66.49ms. Allocated memory is still 100.7MB. Free memory was 45.4MB in the beginning and 42.6MB in the end (delta: 2.8MB). There was no memory consumed. Max. memory is 16.1GB. [2024-11-13 20:49:30,825 INFO L158 Benchmark]: Boogie Preprocessor took 31.50ms. Allocated memory is still 100.7MB. Free memory was 42.6MB in the beginning and 40.8MB in the end (delta: 1.7MB). There was no memory consumed. Max. memory is 16.1GB. [2024-11-13 20:49:30,825 INFO L158 Benchmark]: RCFGBuilder took 514.76ms. Allocated memory is still 100.7MB. Free memory was 40.8MB in the beginning and 55.3MB in the end (delta: -14.5MB). Peak memory consumption was 17.0MB. Max. memory is 16.1GB. [2024-11-13 20:49:30,826 INFO L158 Benchmark]: CodeCheck took 848.07ms. Allocated memory is still 100.7MB. Free memory was 55.3MB in the beginning and 65.4MB in the end (delta: -10.1MB). There was no memory consumed. Max. memory is 16.1GB. [2024-11-13 20:49:30,827 INFO L158 Benchmark]: Witness Printer took 5.74ms. Allocated memory is still 100.7MB. Free memory was 65.4MB in the beginning and 64.9MB in the end (delta: 524.1kB). There was no memory consumed. Max. memory is 16.1GB. [2024-11-13 20:49:30,831 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, 14 locations, 2 error locations. Started 1 CEGAR loops. OverallTime: 0.8s, OverallIterations: 2, TraceHistogramMax: 0, PathProgramHistogramMax: 0, EmptinessCheckTime: 0.0s, AutomataDifference: 0.0s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 0 mSolverCounterUnknown, 14 SdHoareTripleChecker+Valid, 0.0s IncrementalHoareTripleChecker+Time, 0 mSdLazyCounter, 0 mSDsluCounter, 6 SdHoareTripleChecker+Invalid, 0.0s Time, 0 mProtectedAction, 0 SdHoareTripleChecker+Unchecked, 0 IncrementalHoareTripleChecker+Unchecked, 0 mSDsCounter, 2 IncrementalHoareTripleChecker+Valid, 0 mProtectedPredicate, 7 IncrementalHoareTripleChecker+Invalid, 9 SdHoareTripleChecker+Unknown, 0 mSolverCounterNotChecked, 2 mSolverCounterUnsat, 6 mSDtfsCounter, 7 mSolverCounterSat, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Unknown, PredicateUnifierStatistics: 0 DeclaredPredicates, 46 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 2 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, 0.0s SatisfiabilityAnalysisTime, 0.0s InterpolantComputationTime, 15 NumberOfCodeBlocks, 15 NumberOfCodeBlocksAsserted, 2 NumberOfCheckSat, 6 ConstructedInterpolants, 0 QuantifiedInterpolants, 8 SizeOfPredicates, 0 NumberOfNonLiveVariables, 31 ConjunctsInSsa, 2 ConjunctsInUnsatCore, 1 InterpolantComputations, 1 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: 1555]: Unable to prove that integer overflow can never occur Unable to prove that integer overflow can never occur Reason: overapproximation of large string literal at line 1562. Possible FailurePath: [L1522] const int GLOBAL_CONST_TRUE = 1; [L1523] const int GLOBAL_CONST_FALSE = 0; [L1524] const int GLOBAL_CONST_FIVE = 5; [L1525] int globalTrue = 1; [L1526] int globalFalse = 0; [L1527] int globalFive = 5; [L1546] int globalArgc = 0; [L1547] char** globalArgv = ((void *)0); [L1562] CALL printLine("Calling bad()...") VAL [GLOBAL_CONST_FALSE=0, GLOBAL_CONST_FIVE=5, GLOBAL_CONST_TRUE=1, \old(line)={1:0}, globalArgc=0, globalArgv={0:0}, globalFalse=0, globalFive=5, globalTrue=1] [L1414] COND TRUE line != ((void *)0) [L1562] RET printLine("Calling bad()...") VAL [GLOBAL_CONST_FALSE=0, GLOBAL_CONST_FIVE=5, GLOBAL_CONST_TRUE=1, globalArgc=0, globalArgv={0:0}, globalFalse=0, globalFive=5, globalTrue=1] [L1563] CALL CWE190_Integer_Overflow__int_rand_multiply_01_bad() [L1550] int data; [L1551] data = 0 [L1552] EXPR rand() & 1 ? (((unsigned)rand()<<30) ^ ((unsigned)rand()<<15) ^ rand()) : -(((unsigned)rand()<<30) ^ ((unsigned)rand()<<15) ^ rand()) - 1 [L1552] EXPR rand() & 1 ? (((unsigned)rand()<<30) ^ ((unsigned)rand()<<15) ^ rand()) : -(((unsigned)rand()<<30) ^ ((unsigned)rand()<<15) ^ rand()) - 1 [L1552] data = ((int)(rand() & 1 ? (((unsigned)rand()<<30) ^ ((unsigned)rand()<<15) ^ rand()) : -(((unsigned)rand()<<30) ^ ((unsigned)rand()<<15) ^ rand()) - 1)) [L1553] COND TRUE data > 0 VAL [GLOBAL_CONST_FALSE=0, GLOBAL_CONST_FIVE=5, GLOBAL_CONST_TRUE=1, data=2147483647, globalArgc=0, globalArgv={0:0}, globalFalse=0, globalFive=5, globalTrue=1] [L1555] data * 2 VAL [GLOBAL_CONST_FALSE=0, GLOBAL_CONST_FIVE=5, GLOBAL_CONST_TRUE=1, globalArgc=0, globalArgv={0:0}, globalFalse=0, globalFive=5, globalTrue=1] * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.43ms. Allocated memory is still 83.9MB. Free memory was 49.9MB in the beginning and 49.8MB in the end (delta: 107.8kB). There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 1484.36ms. Allocated memory is still 100.7MB. Free memory was 74.5MB in the beginning and 45.4MB in the end (delta: 29.1MB). Peak memory consumption was 49.8MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 66.49ms. Allocated memory is still 100.7MB. Free memory was 45.4MB in the beginning and 42.6MB in the end (delta: 2.8MB). There was no memory consumed. Max. memory is 16.1GB. * Boogie Preprocessor took 31.50ms. Allocated memory is still 100.7MB. Free memory was 42.6MB in the beginning and 40.8MB in the end (delta: 1.7MB). There was no memory consumed. Max. memory is 16.1GB. * RCFGBuilder took 514.76ms. Allocated memory is still 100.7MB. Free memory was 40.8MB in the beginning and 55.3MB in the end (delta: -14.5MB). Peak memory consumption was 17.0MB. Max. memory is 16.1GB. * CodeCheck took 848.07ms. Allocated memory is still 100.7MB. Free memory was 55.3MB in the beginning and 65.4MB in the end (delta: -10.1MB). There was no memory consumed. Max. memory is 16.1GB. * Witness Printer took 5.74ms. Allocated memory is still 100.7MB. Free memory was 65.4MB in the beginning and 64.9MB in the end (delta: 524.1kB). There was no memory consumed. Max. memory is 16.1GB. RESULT: Ultimate could not prove your program: unable to determine feasibility of some traces [2024-11-13 20:49:30,864 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aea414ea-b25b-4d6a-acea-5c5f4428b9ca/bin/ukojak-verify-EEHR8qb7sm/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 Writing output log to file Ultimate.log Result: UNKNOWN: Overapproximated counterexample