./Ultimate.py --spec ../../sv-benchmarks/c/properties/no-overflow.prp --file ../../sv-benchmarks/c/Juliet_Test/CWE191_Integer_Underflow__int_fgets_multiply_42_bad.i --full-output --architecture 64bit -------------------------------------------------------------------------------- Checking for overflows Using default analysis Version 2329fc70 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_f5b131ac-6ad1-4078-83aa-f58bfc74505c/bin/utaipan-gh47qXpMRh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5b131ac-6ad1-4078-83aa-f58bfc74505c/bin/utaipan-gh47qXpMRh/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5b131ac-6ad1-4078-83aa-f58bfc74505c/bin/utaipan-gh47qXpMRh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5b131ac-6ad1-4078-83aa-f58bfc74505c/bin/utaipan-gh47qXpMRh/config/TaipanReach.xml -i ../../sv-benchmarks/c/Juliet_Test/CWE191_Integer_Underflow__int_fgets_multiply_42_bad.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5b131ac-6ad1-4078-83aa-f58bfc74505c/bin/utaipan-gh47qXpMRh/config/svcomp-Overflow-64bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5b131ac-6ad1-4078-83aa-f58bfc74505c/bin/utaipan-gh47qXpMRh --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! overflow) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 64bit --witnessprinter.graph.data.programhash afc1bd4fc34914887c296693ed71988d0af11205a8c6ccdc601bdcead6b103ab --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-2329fc7 [2022-12-14 06:45:02,011 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-12-14 06:45:02,013 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-12-14 06:45:02,032 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-12-14 06:45:02,032 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-12-14 06:45:02,033 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-12-14 06:45:02,034 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-12-14 06:45:02,036 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-12-14 06:45:02,038 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-12-14 06:45:02,038 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-12-14 06:45:02,039 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-12-14 06:45:02,040 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-12-14 06:45:02,041 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-12-14 06:45:02,042 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-12-14 06:45:02,043 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-12-14 06:45:02,044 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-12-14 06:45:02,045 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-12-14 06:45:02,046 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-12-14 06:45:02,047 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-12-14 06:45:02,049 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-12-14 06:45:02,050 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-12-14 06:45:02,052 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-12-14 06:45:02,053 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-12-14 06:45:02,054 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-12-14 06:45:02,057 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-12-14 06:45:02,057 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-12-14 06:45:02,057 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-12-14 06:45:02,058 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-12-14 06:45:02,059 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-12-14 06:45:02,060 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-12-14 06:45:02,060 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-12-14 06:45:02,061 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-12-14 06:45:02,061 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-12-14 06:45:02,062 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-12-14 06:45:02,063 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-12-14 06:45:02,063 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-12-14 06:45:02,064 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-12-14 06:45:02,064 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-12-14 06:45:02,064 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-12-14 06:45:02,065 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-12-14 06:45:02,066 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-12-14 06:45:02,066 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5b131ac-6ad1-4078-83aa-f58bfc74505c/bin/utaipan-gh47qXpMRh/config/svcomp-Overflow-64bit-Taipan_Default.epf [2022-12-14 06:45:02,086 INFO L113 SettingsManager]: Loading preferences was successful [2022-12-14 06:45:02,087 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-12-14 06:45:02,087 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-12-14 06:45:02,087 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-12-14 06:45:02,088 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-12-14 06:45:02,088 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-12-14 06:45:02,088 INFO L138 SettingsManager]: * User list type=DISABLED [2022-12-14 06:45:02,088 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-12-14 06:45:02,088 INFO L138 SettingsManager]: * Explicit value domain=true [2022-12-14 06:45:02,088 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-12-14 06:45:02,089 INFO L138 SettingsManager]: * Octagon Domain=false [2022-12-14 06:45:02,089 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-12-14 06:45:02,089 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-12-14 06:45:02,089 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-12-14 06:45:02,089 INFO L138 SettingsManager]: * Interval Domain=false [2022-12-14 06:45:02,089 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-12-14 06:45:02,090 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-12-14 06:45:02,090 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-12-14 06:45:02,090 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-12-14 06:45:02,091 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2022-12-14 06:45:02,091 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-12-14 06:45:02,091 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-12-14 06:45:02,091 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-12-14 06:45:02,091 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-12-14 06:45:02,092 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-12-14 06:45:02,092 INFO L138 SettingsManager]: * Check absence of signed integer overflows=true [2022-12-14 06:45:02,092 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-12-14 06:45:02,092 INFO L138 SettingsManager]: * Use constant arrays=true [2022-12-14 06:45:02,092 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-12-14 06:45:02,092 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-12-14 06:45:02,093 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-12-14 06:45:02,093 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 06:45:02,093 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-12-14 06:45:02,093 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-12-14 06:45:02,093 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-12-14 06:45:02,093 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-12-14 06:45:02,093 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-12-14 06:45:02,094 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-12-14 06:45:02,094 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-12-14 06:45:02,094 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-12-14 06:45:02,094 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5b131ac-6ad1-4078-83aa-f58bfc74505c/bin/utaipan-gh47qXpMRh/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5b131ac-6ad1-4078-83aa-f58bfc74505c/bin/utaipan-gh47qXpMRh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! overflow) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 64bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> afc1bd4fc34914887c296693ed71988d0af11205a8c6ccdc601bdcead6b103ab [2022-12-14 06:45:02,294 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-12-14 06:45:02,311 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-12-14 06:45:02,313 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-12-14 06:45:02,314 INFO L271 PluginConnector]: Initializing CDTParser... [2022-12-14 06:45:02,314 INFO L275 PluginConnector]: CDTParser initialized [2022-12-14 06:45:02,315 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5b131ac-6ad1-4078-83aa-f58bfc74505c/bin/utaipan-gh47qXpMRh/../../sv-benchmarks/c/Juliet_Test/CWE191_Integer_Underflow__int_fgets_multiply_42_bad.i [2022-12-14 06:45:04,882 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-12-14 06:45:05,145 INFO L351 CDTParser]: Found 1 translation units. [2022-12-14 06:45:05,146 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5b131ac-6ad1-4078-83aa-f58bfc74505c/sv-benchmarks/c/Juliet_Test/CWE191_Integer_Underflow__int_fgets_multiply_42_bad.i [2022-12-14 06:45:05,158 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5b131ac-6ad1-4078-83aa-f58bfc74505c/bin/utaipan-gh47qXpMRh/data/197b3c7a5/babe4c982ab543afab4cb4d1a0f643c2/FLAGb6f7f23c7 [2022-12-14 06:45:05,451 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5b131ac-6ad1-4078-83aa-f58bfc74505c/bin/utaipan-gh47qXpMRh/data/197b3c7a5/babe4c982ab543afab4cb4d1a0f643c2 [2022-12-14 06:45:05,453 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-12-14 06:45:05,454 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-12-14 06:45:05,455 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-12-14 06:45:05,456 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-12-14 06:45:05,459 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-12-14 06:45:05,460 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 06:45:05" (1/1) ... [2022-12-14 06:45:05,461 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1ae7ba98 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 06:45:05, skipping insertion in model container [2022-12-14 06:45:05,461 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 06:45:05" (1/1) ... [2022-12-14 06:45:05,467 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-12-14 06:45:05,504 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-12-14 06:45:05,754 WARN L611 FunctionHandler]: implicit declaration of function __builtin_bswap16 [2022-12-14 06:45:06,094 WARN L623 FunctionHandler]: Unknown extern function puts [2022-12-14 06:45:06,099 WARN L623 FunctionHandler]: Unknown extern function __ctype_b_loc [2022-12-14 06:45:06,100 WARN L623 FunctionHandler]: Unknown extern function __ctype_b_loc [2022-12-14 06:45:06,102 WARN L623 FunctionHandler]: Unknown extern function iswxdigit [2022-12-14 06:45:06,102 WARN L623 FunctionHandler]: Unknown extern function iswxdigit [2022-12-14 06:45:06,117 WARN L623 FunctionHandler]: Unknown extern function fgets [2022-12-14 06:45:06,122 WARN L623 FunctionHandler]: Unknown extern function time [2022-12-14 06:45:06,123 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 06:45:06,131 INFO L203 MainTranslator]: Completed pre-run [2022-12-14 06:45:06,144 WARN L611 FunctionHandler]: implicit declaration of function __builtin_bswap16 [2022-12-14 06:45:06,173 WARN L623 FunctionHandler]: Unknown extern function puts [2022-12-14 06:45:06,174 WARN L623 FunctionHandler]: Unknown extern function __ctype_b_loc [2022-12-14 06:45:06,174 WARN L623 FunctionHandler]: Unknown extern function __ctype_b_loc [2022-12-14 06:45:06,176 WARN L623 FunctionHandler]: Unknown extern function iswxdigit [2022-12-14 06:45:06,176 WARN L623 FunctionHandler]: Unknown extern function iswxdigit [2022-12-14 06:45:06,179 WARN L623 FunctionHandler]: Unknown extern function fgets [2022-12-14 06:45:06,180 WARN L623 FunctionHandler]: Unknown extern function time [2022-12-14 06:45:06,181 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 06:45:06,294 INFO L208 MainTranslator]: Completed translation [2022-12-14 06:45:06,294 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 06:45:06 WrapperNode [2022-12-14 06:45:06,294 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-12-14 06:45:06,295 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-12-14 06:45:06,295 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-12-14 06:45:06,295 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-12-14 06:45:06,302 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 06:45:06" (1/1) ... [2022-12-14 06:45:06,321 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 06:45:06" (1/1) ... [2022-12-14 06:45:06,341 INFO L138 Inliner]: procedures = 501, calls = 63, calls flagged for inlining = 5, calls inlined = 5, statements flattened = 59 [2022-12-14 06:45:06,341 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-12-14 06:45:06,342 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-12-14 06:45:06,342 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-12-14 06:45:06,342 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-12-14 06:45:06,351 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 06:45:06" (1/1) ... [2022-12-14 06:45:06,351 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 06:45:06" (1/1) ... [2022-12-14 06:45:06,353 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 06:45:06" (1/1) ... [2022-12-14 06:45:06,353 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 06:45:06" (1/1) ... [2022-12-14 06:45:06,358 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 06:45:06" (1/1) ... [2022-12-14 06:45:06,359 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 06:45:06" (1/1) ... [2022-12-14 06:45:06,360 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 06:45:06" (1/1) ... [2022-12-14 06:45:06,361 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 06:45:06" (1/1) ... [2022-12-14 06:45:06,362 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-12-14 06:45:06,363 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-12-14 06:45:06,363 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-12-14 06:45:06,363 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-12-14 06:45:06,363 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 06:45:06" (1/1) ... [2022-12-14 06:45:06,369 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 06:45:06,377 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5b131ac-6ad1-4078-83aa-f58bfc74505c/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 06:45:06,387 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5b131ac-6ad1-4078-83aa-f58bfc74505c/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-12-14 06:45:06,388 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5b131ac-6ad1-4078-83aa-f58bfc74505c/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-12-14 06:45:06,419 INFO L130 BoogieDeclarations]: Found specification of procedure fgets [2022-12-14 06:45:06,419 INFO L130 BoogieDeclarations]: Found specification of procedure printLine [2022-12-14 06:45:06,419 INFO L138 BoogieDeclarations]: Found implementation of procedure printLine [2022-12-14 06:45:06,419 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-12-14 06:45:06,419 INFO L130 BoogieDeclarations]: Found specification of procedure write~unchecked~int [2022-12-14 06:45:06,420 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-12-14 06:45:06,420 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-12-14 06:45:06,420 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-12-14 06:45:06,420 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-12-14 06:45:06,420 INFO L130 BoogieDeclarations]: Found specification of procedure time [2022-12-14 06:45:06,420 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-12-14 06:45:06,531 INFO L235 CfgBuilder]: Building ICFG [2022-12-14 06:45:06,533 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-12-14 06:45:06,625 INFO L276 CfgBuilder]: Performing block encoding [2022-12-14 06:45:06,649 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-12-14 06:45:06,650 INFO L300 CfgBuilder]: Removed 0 assume(true) statements. [2022-12-14 06:45:06,652 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 06:45:06 BoogieIcfgContainer [2022-12-14 06:45:06,652 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-12-14 06:45:06,654 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-12-14 06:45:06,654 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-12-14 06:45:06,657 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-12-14 06:45:06,657 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.12 06:45:05" (1/3) ... [2022-12-14 06:45:06,658 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4fee2f2f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 06:45:06, skipping insertion in model container [2022-12-14 06:45:06,658 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 06:45:06" (2/3) ... [2022-12-14 06:45:06,659 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4fee2f2f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 06:45:06, skipping insertion in model container [2022-12-14 06:45:06,659 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 06:45:06" (3/3) ... [2022-12-14 06:45:06,660 INFO L112 eAbstractionObserver]: Analyzing ICFG CWE191_Integer_Underflow__int_fgets_multiply_42_bad.i [2022-12-14 06:45:06,678 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-12-14 06:45:06,678 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2022-12-14 06:45:06,714 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-12-14 06:45:06,719 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@6935439f, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-12-14 06:45:06,719 INFO L358 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2022-12-14 06:45:06,722 INFO L276 IsEmpty]: Start isEmpty. Operand has 17 states, 10 states have (on average 1.4) internal successors, (14), 13 states have internal predecessors, (14), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-12-14 06:45:06,727 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-12-14 06:45:06,727 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 06:45:06,727 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 06:45:06,728 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONINTEGER_OVERFLOW === [ULTIMATE.startErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ULTIMATE.startErr1ASSERT_VIOLATIONINTEGER_OVERFLOW] === [2022-12-14 06:45:06,731 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 06:45:06,731 INFO L85 PathProgramCache]: Analyzing trace with hash -39584830, now seen corresponding path program 1 times [2022-12-14 06:45:06,738 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 06:45:06,738 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2092499654] [2022-12-14 06:45:06,738 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 06:45:06,738 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 06:45:06,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-12-14 06:45:06,848 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-12-14 06:45:06,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-12-14 06:45:06,891 INFO L130 FreeRefinementEngine]: Strategy SIFA_TAIPAN found a feasible trace [2022-12-14 06:45:06,893 INFO L360 BasicCegarLoop]: Counterexample is feasible [2022-12-14 06:45:06,894 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONINTEGER_OVERFLOW (1 of 2 remaining) [2022-12-14 06:45:06,896 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr1ASSERT_VIOLATIONINTEGER_OVERFLOW (0 of 2 remaining) [2022-12-14 06:45:06,897 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-12-14 06:45:06,901 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2022-12-14 06:45:06,906 INFO L178 ceAbstractionStarter]: Computing trace abstraction results [2022-12-14 06:45:06,928 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 14.12 06:45:06 BoogieIcfgContainer [2022-12-14 06:45:06,928 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2022-12-14 06:45:06,928 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2022-12-14 06:45:06,929 INFO L271 PluginConnector]: Initializing Witness Printer... [2022-12-14 06:45:06,929 INFO L275 PluginConnector]: Witness Printer initialized [2022-12-14 06:45:06,929 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 06:45:06" (3/4) ... [2022-12-14 06:45:06,932 INFO L140 WitnessPrinter]: No result that supports witness generation found [2022-12-14 06:45:06,932 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2022-12-14 06:45:06,933 INFO L158 Benchmark]: Toolchain (without parser) took 1479.10ms. Allocated memory is still 140.5MB. Free memory was 103.3MB in the beginning and 98.4MB in the end (delta: 4.8MB). Peak memory consumption was 5.3MB. Max. memory is 16.1GB. [2022-12-14 06:45:06,934 INFO L158 Benchmark]: CDTParser took 0.10ms. Allocated memory is still 102.8MB. Free memory is still 77.4MB. There was no memory consumed. Max. memory is 16.1GB. [2022-12-14 06:45:06,934 INFO L158 Benchmark]: CACSL2BoogieTranslator took 839.24ms. Allocated memory is still 140.5MB. Free memory was 102.8MB in the beginning and 85.8MB in the end (delta: 17.0MB). Peak memory consumption was 48.7MB. Max. memory is 16.1GB. [2022-12-14 06:45:06,935 INFO L158 Benchmark]: Boogie Procedure Inliner took 46.10ms. Allocated memory is still 140.5MB. Free memory was 85.8MB in the beginning and 82.4MB in the end (delta: 3.4MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2022-12-14 06:45:06,935 INFO L158 Benchmark]: Boogie Preprocessor took 20.58ms. Allocated memory is still 140.5MB. Free memory was 82.4MB in the beginning and 81.0MB in the end (delta: 1.5MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2022-12-14 06:45:06,936 INFO L158 Benchmark]: RCFGBuilder took 289.09ms. Allocated memory is still 140.5MB. Free memory was 81.0MB in the beginning and 66.3MB in the end (delta: 14.7MB). Peak memory consumption was 14.7MB. Max. memory is 16.1GB. [2022-12-14 06:45:06,936 INFO L158 Benchmark]: TraceAbstraction took 274.05ms. Allocated memory is still 140.5MB. Free memory was 65.7MB in the beginning and 98.9MB in the end (delta: -33.2MB). There was no memory consumed. Max. memory is 16.1GB. [2022-12-14 06:45:06,937 INFO L158 Benchmark]: Witness Printer took 3.97ms. Allocated memory is still 140.5MB. Free memory was 98.9MB in the beginning and 98.4MB in the end (delta: 481.2kB). There was no memory consumed. Max. memory is 16.1GB. [2022-12-14 06:45:06,939 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.10ms. Allocated memory is still 102.8MB. Free memory is still 77.4MB. There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 839.24ms. Allocated memory is still 140.5MB. Free memory was 102.8MB in the beginning and 85.8MB in the end (delta: 17.0MB). Peak memory consumption was 48.7MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 46.10ms. Allocated memory is still 140.5MB. Free memory was 85.8MB in the beginning and 82.4MB in the end (delta: 3.4MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Boogie Preprocessor took 20.58ms. Allocated memory is still 140.5MB. Free memory was 82.4MB in the beginning and 81.0MB in the end (delta: 1.5MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * RCFGBuilder took 289.09ms. Allocated memory is still 140.5MB. Free memory was 81.0MB in the beginning and 66.3MB in the end (delta: 14.7MB). Peak memory consumption was 14.7MB. Max. memory is 16.1GB. * TraceAbstraction took 274.05ms. Allocated memory is still 140.5MB. Free memory was 65.7MB in the beginning and 98.9MB in the end (delta: -33.2MB). There was no memory consumed. Max. memory is 16.1GB. * Witness Printer took 3.97ms. Allocated memory is still 140.5MB. Free memory was 98.9MB in the beginning and 98.4MB in the end (delta: 481.2kB). There was no memory consumed. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0s ErrorAutomatonConstructionTimeTotal, 0.0s FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0s ErrorAutomatonConstructionTimeAvg, 0.0s ErrorAutomatonDifferenceTimeAvg, 0.0s ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - UnprovableResult [Line: 1570]: Unable to prove that integer overflow can never occur Unable to prove that integer overflow can never occur Reason: overapproximation of atoi at line 1554. 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); [L1577] CALL 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, line={4:0}] [L1414] COND TRUE line != ((void *)0) [L1577] RET printLine("Calling bad()...") VAL [\old(argc)=1073741826, argc=1073741826, argv={1073741829:1073741827}, argv={1073741829:1073741827}, GLOBAL_CONST_FALSE=0, GLOBAL_CONST_FIVE=5, GLOBAL_CONST_TRUE=1, globalArgc=0, globalArgv={0:0}, globalFalse=0, globalFive=5, globalTrue=1] [L1578] CALL CWE191_Integer_Underflow__int_fgets_multiply_42_bad() [L1565] int data; [L1566] data = 0 [L1567] CALL, EXPR badSource(data) [L1551] char inputBuffer[(3 * sizeof(data) + 2)] = ""; [L1552] COND TRUE fgets(inputBuffer, (3 * sizeof(data) + 2), stdin) != ((void *)0) [L1554] data = atoi(inputBuffer) [L1551] char inputBuffer[(3 * sizeof(data) + 2)] = ""; [L1561] return data; [L1567] RET, EXPR badSource(data) [L1567] data = badSource(data) [L1568] COND TRUE data < 0 VAL [data=-1073741825, GLOBAL_CONST_FALSE=0, GLOBAL_CONST_FIVE=5, GLOBAL_CONST_TRUE=1, globalArgc=0, globalArgv={0:0}, globalFalse=0, globalFive=5, globalTrue=1] [L1570] data * 2 VAL [data=-1073741825, GLOBAL_CONST_FALSE=0, GLOBAL_CONST_FIVE=5, GLOBAL_CONST_TRUE=1, globalArgc=0, globalArgv={0:0}, globalFalse=0, globalFive=5, globalTrue=1] - UnprovableResult [Line: 1570]: Unable to prove that integer overflow can never occur Unable to prove that integer overflow can never occur Reason: Not analyzed. - StatisticsResult: Ultimate Automizer benchmark data CFG has 2 procedures, 17 locations, 2 error locations. Started 1 CEGAR loops. OverallTime: 0.2s, OverallIterations: 1, TraceHistogramMax: 1, PathProgramHistogramMax: 1, EmptinessCheckTime: 0.0s, AutomataDifference: 0.0s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: , PredicateUnifierStatistics: No data available, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=17occurred in iteration=0, InterpolantAutomatonStates: 0, traceCheckStatistics: No data available, 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: TRACE_CHECK: 0.0s SsaConstructionTime, 0.0s SatisfiabilityAnalysisTime, 0.0s InterpolantComputationTime, 9 NumberOfCodeBlocks, 9 NumberOfCodeBlocksAsserted, 1 NumberOfCheckSat, 0 ConstructedInterpolants, 0 QuantifiedInterpolants, 0 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 0 InterpolantComputations, 0 PerfectInterpolantSequences, 0/0 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: unable to determine feasibility of some traces [2022-12-14 06:45:06,952 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5b131ac-6ad1-4078-83aa-f58bfc74505c/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (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_f5b131ac-6ad1-4078-83aa-f58bfc74505c/bin/utaipan-gh47qXpMRh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5b131ac-6ad1-4078-83aa-f58bfc74505c/bin/utaipan-gh47qXpMRh/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5b131ac-6ad1-4078-83aa-f58bfc74505c/bin/utaipan-gh47qXpMRh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5b131ac-6ad1-4078-83aa-f58bfc74505c/bin/utaipan-gh47qXpMRh/config/TaipanReach.xml -i ../../sv-benchmarks/c/Juliet_Test/CWE191_Integer_Underflow__int_fgets_multiply_42_bad.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5b131ac-6ad1-4078-83aa-f58bfc74505c/bin/utaipan-gh47qXpMRh/config/svcomp-Overflow-64bit-Taipan_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5b131ac-6ad1-4078-83aa-f58bfc74505c/bin/utaipan-gh47qXpMRh --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! overflow) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 64bit --witnessprinter.graph.data.programhash afc1bd4fc34914887c296693ed71988d0af11205a8c6ccdc601bdcead6b103ab --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-2329fc7 [2022-12-14 06:45:08,644 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-12-14 06:45:08,645 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-12-14 06:45:08,663 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-12-14 06:45:08,664 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-12-14 06:45:08,664 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-12-14 06:45:08,666 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-12-14 06:45:08,667 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-12-14 06:45:08,669 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-12-14 06:45:08,669 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-12-14 06:45:08,670 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-12-14 06:45:08,671 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-12-14 06:45:08,672 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-12-14 06:45:08,673 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-12-14 06:45:08,674 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-12-14 06:45:08,675 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-12-14 06:45:08,676 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-12-14 06:45:08,677 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-12-14 06:45:08,678 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-12-14 06:45:08,680 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-12-14 06:45:08,681 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-12-14 06:45:08,682 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-12-14 06:45:08,684 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-12-14 06:45:08,684 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-12-14 06:45:08,688 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-12-14 06:45:08,688 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-12-14 06:45:08,688 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-12-14 06:45:08,689 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-12-14 06:45:08,690 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-12-14 06:45:08,690 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-12-14 06:45:08,691 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-12-14 06:45:08,691 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-12-14 06:45:08,692 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-12-14 06:45:08,693 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-12-14 06:45:08,699 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-12-14 06:45:08,699 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-12-14 06:45:08,700 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-12-14 06:45:08,700 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-12-14 06:45:08,700 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-12-14 06:45:08,701 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-12-14 06:45:08,701 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-12-14 06:45:08,702 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5b131ac-6ad1-4078-83aa-f58bfc74505c/bin/utaipan-gh47qXpMRh/config/svcomp-Overflow-64bit-Taipan_Bitvector.epf [2022-12-14 06:45:08,727 INFO L113 SettingsManager]: Loading preferences was successful [2022-12-14 06:45:08,727 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-12-14 06:45:08,728 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-12-14 06:45:08,728 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-12-14 06:45:08,729 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-12-14 06:45:08,729 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-12-14 06:45:08,729 INFO L138 SettingsManager]: * User list type=DISABLED [2022-12-14 06:45:08,729 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-12-14 06:45:08,729 INFO L138 SettingsManager]: * Explicit value domain=true [2022-12-14 06:45:08,730 INFO L138 SettingsManager]: * Octagon Domain=false [2022-12-14 06:45:08,730 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-12-14 06:45:08,730 INFO L138 SettingsManager]: * Interval Domain=false [2022-12-14 06:45:08,731 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-12-14 06:45:08,731 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2022-12-14 06:45:08,731 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-12-14 06:45:08,731 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-12-14 06:45:08,732 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-12-14 06:45:08,732 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-12-14 06:45:08,732 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2022-12-14 06:45:08,732 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2022-12-14 06:45:08,732 INFO L138 SettingsManager]: * Check absence of signed integer overflows=true [2022-12-14 06:45:08,732 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2022-12-14 06:45:08,733 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-12-14 06:45:08,733 INFO L138 SettingsManager]: * Use constant arrays=true [2022-12-14 06:45:08,733 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-12-14 06:45:08,733 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-12-14 06:45:08,733 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-12-14 06:45:08,734 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-12-14 06:45:08,734 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 06:45:08,734 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-12-14 06:45:08,734 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-12-14 06:45:08,734 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-12-14 06:45:08,735 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2022-12-14 06:45:08,735 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2022-12-14 06:45:08,735 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-12-14 06:45:08,735 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-12-14 06:45:08,735 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2022-12-14 06:45:08,736 INFO L138 SettingsManager]: * Logic for external solver=AUFBV 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_f5b131ac-6ad1-4078-83aa-f58bfc74505c/bin/utaipan-gh47qXpMRh/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5b131ac-6ad1-4078-83aa-f58bfc74505c/bin/utaipan-gh47qXpMRh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! overflow) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 64bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> afc1bd4fc34914887c296693ed71988d0af11205a8c6ccdc601bdcead6b103ab [2022-12-14 06:45:08,988 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-12-14 06:45:09,005 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-12-14 06:45:09,007 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-12-14 06:45:09,008 INFO L271 PluginConnector]: Initializing CDTParser... [2022-12-14 06:45:09,008 INFO L275 PluginConnector]: CDTParser initialized [2022-12-14 06:45:09,010 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5b131ac-6ad1-4078-83aa-f58bfc74505c/bin/utaipan-gh47qXpMRh/../../sv-benchmarks/c/Juliet_Test/CWE191_Integer_Underflow__int_fgets_multiply_42_bad.i [2022-12-14 06:45:11,601 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-12-14 06:45:11,824 INFO L351 CDTParser]: Found 1 translation units. [2022-12-14 06:45:11,824 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5b131ac-6ad1-4078-83aa-f58bfc74505c/sv-benchmarks/c/Juliet_Test/CWE191_Integer_Underflow__int_fgets_multiply_42_bad.i [2022-12-14 06:45:11,852 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5b131ac-6ad1-4078-83aa-f58bfc74505c/bin/utaipan-gh47qXpMRh/data/7808d1eea/fe32f52d799547b982fb2bbc2ce004b1/FLAG9cd62cb05 [2022-12-14 06:45:11,867 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5b131ac-6ad1-4078-83aa-f58bfc74505c/bin/utaipan-gh47qXpMRh/data/7808d1eea/fe32f52d799547b982fb2bbc2ce004b1 [2022-12-14 06:45:11,869 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-12-14 06:45:11,871 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-12-14 06:45:11,872 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-12-14 06:45:11,872 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-12-14 06:45:11,875 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-12-14 06:45:11,876 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 06:45:11" (1/1) ... [2022-12-14 06:45:11,877 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@391f4093 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 06:45:11, skipping insertion in model container [2022-12-14 06:45:11,877 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 06:45:11" (1/1) ... [2022-12-14 06:45:11,884 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-12-14 06:45:11,928 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-12-14 06:45:12,177 WARN L611 FunctionHandler]: implicit declaration of function __builtin_bswap16 [2022-12-14 06:45:12,504 WARN L623 FunctionHandler]: Unknown extern function puts [2022-12-14 06:45:12,508 WARN L623 FunctionHandler]: Unknown extern function __ctype_b_loc [2022-12-14 06:45:12,509 WARN L623 FunctionHandler]: Unknown extern function __ctype_b_loc [2022-12-14 06:45:12,511 WARN L623 FunctionHandler]: Unknown extern function iswxdigit [2022-12-14 06:45:12,512 WARN L623 FunctionHandler]: Unknown extern function iswxdigit [2022-12-14 06:45:12,526 WARN L623 FunctionHandler]: Unknown extern function fgets [2022-12-14 06:45:12,531 WARN L623 FunctionHandler]: Unknown extern function time [2022-12-14 06:45:12,531 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 06:45:12,542 INFO L203 MainTranslator]: Completed pre-run [2022-12-14 06:45:12,555 WARN L611 FunctionHandler]: implicit declaration of function __builtin_bswap16 [2022-12-14 06:45:12,588 WARN L623 FunctionHandler]: Unknown extern function puts [2022-12-14 06:45:12,589 WARN L623 FunctionHandler]: Unknown extern function __ctype_b_loc [2022-12-14 06:45:12,590 WARN L623 FunctionHandler]: Unknown extern function __ctype_b_loc [2022-12-14 06:45:12,591 WARN L623 FunctionHandler]: Unknown extern function iswxdigit [2022-12-14 06:45:12,592 WARN L623 FunctionHandler]: Unknown extern function iswxdigit [2022-12-14 06:45:12,595 WARN L623 FunctionHandler]: Unknown extern function fgets [2022-12-14 06:45:12,596 WARN L623 FunctionHandler]: Unknown extern function time [2022-12-14 06:45:12,597 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 06:45:12,725 INFO L208 MainTranslator]: Completed translation [2022-12-14 06:45:12,725 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 06:45:12 WrapperNode [2022-12-14 06:45:12,725 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-12-14 06:45:12,726 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-12-14 06:45:12,726 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-12-14 06:45:12,727 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-12-14 06:45:12,734 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 06:45:12" (1/1) ... [2022-12-14 06:45:12,762 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 06:45:12" (1/1) ... [2022-12-14 06:45:12,777 INFO L138 Inliner]: procedures = 506, calls = 63, calls flagged for inlining = 5, calls inlined = 5, statements flattened = 57 [2022-12-14 06:45:12,777 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-12-14 06:45:12,778 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-12-14 06:45:12,778 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-12-14 06:45:12,778 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-12-14 06:45:12,784 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 06:45:12" (1/1) ... [2022-12-14 06:45:12,785 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 06:45:12" (1/1) ... [2022-12-14 06:45:12,786 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 06:45:12" (1/1) ... [2022-12-14 06:45:12,787 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 06:45:12" (1/1) ... [2022-12-14 06:45:12,792 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 06:45:12" (1/1) ... [2022-12-14 06:45:12,793 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 06:45:12" (1/1) ... [2022-12-14 06:45:12,795 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 06:45:12" (1/1) ... [2022-12-14 06:45:12,796 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 06:45:12" (1/1) ... [2022-12-14 06:45:12,798 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-12-14 06:45:12,799 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-12-14 06:45:12,799 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-12-14 06:45:12,799 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-12-14 06:45:12,799 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 06:45:12" (1/1) ... [2022-12-14 06:45:12,804 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 06:45:12,814 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5b131ac-6ad1-4078-83aa-f58bfc74505c/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 06:45:12,825 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5b131ac-6ad1-4078-83aa-f58bfc74505c/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-12-14 06:45:12,827 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5b131ac-6ad1-4078-83aa-f58bfc74505c/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-12-14 06:45:12,868 INFO L130 BoogieDeclarations]: Found specification of procedure fgets [2022-12-14 06:45:12,868 INFO L130 BoogieDeclarations]: Found specification of procedure printLine [2022-12-14 06:45:12,868 INFO L138 BoogieDeclarations]: Found implementation of procedure printLine [2022-12-14 06:45:12,868 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-12-14 06:45:12,868 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2022-12-14 06:45:12,868 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-12-14 06:45:12,868 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-12-14 06:45:12,869 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-12-14 06:45:12,869 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-12-14 06:45:12,869 INFO L130 BoogieDeclarations]: Found specification of procedure time [2022-12-14 06:45:12,869 INFO L130 BoogieDeclarations]: Found specification of procedure write~unchecked~intINTTYPE1 [2022-12-14 06:45:12,998 INFO L235 CfgBuilder]: Building ICFG [2022-12-14 06:45:13,000 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-12-14 06:45:13,133 INFO L276 CfgBuilder]: Performing block encoding [2022-12-14 06:45:13,138 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-12-14 06:45:13,138 INFO L300 CfgBuilder]: Removed 0 assume(true) statements. [2022-12-14 06:45:13,140 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 06:45:13 BoogieIcfgContainer [2022-12-14 06:45:13,140 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-12-14 06:45:13,141 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-12-14 06:45:13,141 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-12-14 06:45:13,144 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-12-14 06:45:13,144 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.12 06:45:11" (1/3) ... [2022-12-14 06:45:13,144 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@bc598c1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 06:45:13, skipping insertion in model container [2022-12-14 06:45:13,144 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 06:45:12" (2/3) ... [2022-12-14 06:45:13,145 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@bc598c1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 06:45:13, skipping insertion in model container [2022-12-14 06:45:13,145 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 06:45:13" (3/3) ... [2022-12-14 06:45:13,146 INFO L112 eAbstractionObserver]: Analyzing ICFG CWE191_Integer_Underflow__int_fgets_multiply_42_bad.i [2022-12-14 06:45:13,160 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-12-14 06:45:13,160 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2022-12-14 06:45:13,196 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-12-14 06:45:13,201 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@3fea356, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-12-14 06:45:13,201 INFO L358 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2022-12-14 06:45:13,205 INFO L276 IsEmpty]: Start isEmpty. Operand has 24 states, 17 states have (on average 1.2941176470588236) internal successors, (22), 20 states have internal predecessors, (22), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-12-14 06:45:13,211 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-12-14 06:45:13,211 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 06:45:13,211 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 06:45:13,212 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONINTEGER_OVERFLOW === [ULTIMATE.startErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ULTIMATE.startErr1ASSERT_VIOLATIONINTEGER_OVERFLOW] === [2022-12-14 06:45:13,216 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 06:45:13,216 INFO L85 PathProgramCache]: Analyzing trace with hash -761706190, now seen corresponding path program 1 times [2022-12-14 06:45:13,227 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-12-14 06:45:13,227 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [394029896] [2022-12-14 06:45:13,227 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 06:45:13,227 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-12-14 06:45:13,228 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5b131ac-6ad1-4078-83aa-f58bfc74505c/bin/utaipan-gh47qXpMRh/mathsat [2022-12-14 06:45:13,229 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5b131ac-6ad1-4078-83aa-f58bfc74505c/bin/utaipan-gh47qXpMRh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-12-14 06:45:13,230 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5b131ac-6ad1-4078-83aa-f58bfc74505c/bin/utaipan-gh47qXpMRh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2022-12-14 06:45:13,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-12-14 06:45:13,353 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-12-14 06:45:13,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-12-14 06:45:13,429 INFO L130 FreeRefinementEngine]: Strategy WALRUS found a feasible trace [2022-12-14 06:45:13,431 INFO L360 BasicCegarLoop]: Counterexample is feasible [2022-12-14 06:45:13,432 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONINTEGER_OVERFLOW (1 of 2 remaining) [2022-12-14 06:45:13,434 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr1ASSERT_VIOLATIONINTEGER_OVERFLOW (0 of 2 remaining) [2022-12-14 06:45:13,445 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5b131ac-6ad1-4078-83aa-f58bfc74505c/bin/utaipan-gh47qXpMRh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2022-12-14 06:45:13,635 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5b131ac-6ad1-4078-83aa-f58bfc74505c/bin/utaipan-gh47qXpMRh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-12-14 06:45:13,638 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2022-12-14 06:45:13,642 INFO L178 ceAbstractionStarter]: Computing trace abstraction results [2022-12-14 06:45:13,662 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 14.12 06:45:13 BoogieIcfgContainer [2022-12-14 06:45:13,662 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2022-12-14 06:45:13,663 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2022-12-14 06:45:13,663 INFO L271 PluginConnector]: Initializing Witness Printer... [2022-12-14 06:45:13,663 INFO L275 PluginConnector]: Witness Printer initialized [2022-12-14 06:45:13,663 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 06:45:13" (3/4) ... [2022-12-14 06:45:13,666 INFO L140 WitnessPrinter]: No result that supports witness generation found [2022-12-14 06:45:13,667 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2022-12-14 06:45:13,668 INFO L158 Benchmark]: Toolchain (without parser) took 1796.97ms. Allocated memory is still 62.9MB. Free memory was 30.5MB in the beginning and 29.9MB in the end (delta: 628.2kB). There was no memory consumed. Max. memory is 16.1GB. [2022-12-14 06:45:13,668 INFO L158 Benchmark]: CDTParser took 0.17ms. Allocated memory is still 50.3MB. Free memory was 28.8MB in the beginning and 28.8MB in the end (delta: 52.4kB). There was no memory consumed. Max. memory is 16.1GB. [2022-12-14 06:45:13,669 INFO L158 Benchmark]: CACSL2BoogieTranslator took 853.80ms. Allocated memory is still 62.9MB. Free memory was 30.4MB in the beginning and 36.8MB in the end (delta: -6.4MB). Peak memory consumption was 12.3MB. Max. memory is 16.1GB. [2022-12-14 06:45:13,669 INFO L158 Benchmark]: Boogie Procedure Inliner took 51.03ms. Allocated memory is still 62.9MB. Free memory was 36.8MB in the beginning and 33.6MB in the end (delta: 3.2MB). Peak memory consumption was 4.2MB. Max. memory is 16.1GB. [2022-12-14 06:45:13,670 INFO L158 Benchmark]: Boogie Preprocessor took 20.67ms. Allocated memory is still 62.9MB. Free memory was 33.6MB in the beginning and 31.5MB in the end (delta: 2.1MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2022-12-14 06:45:13,670 INFO L158 Benchmark]: RCFGBuilder took 341.18ms. Allocated memory is still 62.9MB. Free memory was 31.5MB in the beginning and 32.2MB in the end (delta: -663.9kB). Peak memory consumption was 14.4MB. Max. memory is 16.1GB. [2022-12-14 06:45:13,671 INFO L158 Benchmark]: TraceAbstraction took 520.72ms. Allocated memory is still 62.9MB. Free memory was 31.8MB in the beginning and 30.5MB in the end (delta: 1.3MB). Peak memory consumption was 804.9kB. Max. memory is 16.1GB. [2022-12-14 06:45:13,671 INFO L158 Benchmark]: Witness Printer took 4.06ms. Allocated memory is still 62.9MB. Free memory was 30.5MB in the beginning and 29.9MB in the end (delta: 553.5kB). There was no memory consumed. Max. memory is 16.1GB. [2022-12-14 06:45:13,674 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.17ms. Allocated memory is still 50.3MB. Free memory was 28.8MB in the beginning and 28.8MB in the end (delta: 52.4kB). There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 853.80ms. Allocated memory is still 62.9MB. Free memory was 30.4MB in the beginning and 36.8MB in the end (delta: -6.4MB). Peak memory consumption was 12.3MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 51.03ms. Allocated memory is still 62.9MB. Free memory was 36.8MB in the beginning and 33.6MB in the end (delta: 3.2MB). Peak memory consumption was 4.2MB. Max. memory is 16.1GB. * Boogie Preprocessor took 20.67ms. Allocated memory is still 62.9MB. Free memory was 33.6MB in the beginning and 31.5MB in the end (delta: 2.1MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * RCFGBuilder took 341.18ms. Allocated memory is still 62.9MB. Free memory was 31.5MB in the beginning and 32.2MB in the end (delta: -663.9kB). Peak memory consumption was 14.4MB. Max. memory is 16.1GB. * TraceAbstraction took 520.72ms. Allocated memory is still 62.9MB. Free memory was 31.8MB in the beginning and 30.5MB in the end (delta: 1.3MB). Peak memory consumption was 804.9kB. Max. memory is 16.1GB. * Witness Printer took 4.06ms. Allocated memory is still 62.9MB. Free memory was 30.5MB in the beginning and 29.9MB in the end (delta: 553.5kB). There was no memory consumed. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0s ErrorAutomatonConstructionTimeTotal, 0.0s FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0s ErrorAutomatonConstructionTimeAvg, 0.0s ErrorAutomatonDifferenceTimeAvg, 0.0s ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - UnprovableResult [Line: 1570]: Unable to prove that integer overflow can never occur Unable to prove that integer overflow can never occur Reason: overapproximation of atoi at line 1554. 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); VAL [GLOBAL_CONST_FALSE=0, GLOBAL_CONST_FIVE=5, GLOBAL_CONST_TRUE=1, globalArgc=0, globalArgv={0:0}, globalFalse=0, globalFive=5, globalTrue=1] [L1577] CALL 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, line={4:0}] [L1414] COND TRUE line != ((void *)0) [L1577] RET printLine("Calling bad()...") VAL [\old(argc)=12, argc=12, argv={13:12}, argv={13:12}, GLOBAL_CONST_FALSE=0, GLOBAL_CONST_FIVE=5, GLOBAL_CONST_TRUE=1, globalArgc=0, globalArgv={0:0}, globalFalse=0, globalFive=5, globalTrue=1] [L1578] CALL CWE191_Integer_Underflow__int_fgets_multiply_42_bad() [L1565] int data; [L1566] data = 0 [L1567] CALL, EXPR badSource(data) [L1551] char inputBuffer[(3 * sizeof(data) + 2)] = ""; [L1552] COND TRUE fgets(inputBuffer, (3 * sizeof(data) + 2), stdin) != ((void *)0) [L1554] data = atoi(inputBuffer) [L1551] char inputBuffer[(3 * sizeof(data) + 2)] = ""; [L1561] return data; VAL [\old(data)=0, \result=-2147483648, data=-2147483648, GLOBAL_CONST_FALSE=0, GLOBAL_CONST_FIVE=5, GLOBAL_CONST_TRUE=1, globalArgc=0, globalArgv={0:0}, globalFalse=0, globalFive=5, globalTrue=1] [L1567] RET, EXPR badSource(data) [L1567] data = badSource(data) [L1568] COND TRUE data < 0 VAL [data=-2147483648, GLOBAL_CONST_FALSE=0, GLOBAL_CONST_FIVE=5, GLOBAL_CONST_TRUE=1, globalArgc=0, globalArgv={0:0}, globalFalse=0, globalFive=5, globalTrue=1] [L1570] data * 2 VAL [data=-2147483648, GLOBAL_CONST_FALSE=0, GLOBAL_CONST_FIVE=5, GLOBAL_CONST_TRUE=1, globalArgc=0, globalArgv={0:0}, globalFalse=0, globalFive=5, globalTrue=1] - UnprovableResult [Line: 1570]: Unable to prove that integer overflow can never occur Unable to prove that integer overflow can never occur Reason: Not analyzed. - StatisticsResult: Ultimate Automizer benchmark data CFG has 2 procedures, 24 locations, 2 error locations. Started 1 CEGAR loops. OverallTime: 0.5s, OverallIterations: 1, TraceHistogramMax: 1, PathProgramHistogramMax: 1, EmptinessCheckTime: 0.0s, AutomataDifference: 0.0s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: , PredicateUnifierStatistics: No data available, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=24occurred in iteration=0, InterpolantAutomatonStates: 0, traceCheckStatistics: No data available, 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: TRACE_CHECK: 0.0s SsaConstructionTime, 0.0s SatisfiabilityAnalysisTime, 0.0s InterpolantComputationTime, 13 NumberOfCodeBlocks, 13 NumberOfCodeBlocksAsserted, 1 NumberOfCheckSat, 0 ConstructedInterpolants, 0 QuantifiedInterpolants, 0 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 0 InterpolantComputations, 0 PerfectInterpolantSequences, 0/0 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: unable to determine feasibility of some traces [2022-12-14 06:45:13,689 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5b131ac-6ad1-4078-83aa-f58bfc74505c/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Ended with exit code 0 Received shutdown request... --- End real Ultimate output --- Execution finished normally Writing output log to file Ultimate.log Result: UNKNOWN: Overapproximated counterexample