./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/array-memsafety/openbsd_cstrncmp-alloca-2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version b5237d83 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_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/array-memsafety/openbsd_cstrncmp-alloca-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash e0283c4a072a13e5b82b0728b718582152e385c6ee1404b3ed9be4e37b84a0b2 --- 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-b5237d8 [2022-11-22 00:29:15,301 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-22 00:29:15,303 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-22 00:29:15,342 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-22 00:29:15,346 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-22 00:29:15,351 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-22 00:29:15,353 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-22 00:29:15,358 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-22 00:29:15,361 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-22 00:29:15,367 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-22 00:29:15,369 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-22 00:29:15,372 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-22 00:29:15,373 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-22 00:29:15,376 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-22 00:29:15,378 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-22 00:29:15,381 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-22 00:29:15,384 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-22 00:29:15,386 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-22 00:29:15,388 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-22 00:29:15,396 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-22 00:29:15,398 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-22 00:29:15,401 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-22 00:29:15,402 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-22 00:29:15,404 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-22 00:29:15,415 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-22 00:29:15,416 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-22 00:29:15,416 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-22 00:29:15,419 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-22 00:29:15,420 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-22 00:29:15,421 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-22 00:29:15,422 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-22 00:29:15,424 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-22 00:29:15,426 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-22 00:29:15,428 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-22 00:29:15,432 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-22 00:29:15,432 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-22 00:29:15,433 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-22 00:29:15,434 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-22 00:29:15,434 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-22 00:29:15,437 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-22 00:29:15,438 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-22 00:29:15,439 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2022-11-22 00:29:15,494 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-22 00:29:15,494 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-22 00:29:15,495 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-22 00:29:15,496 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-22 00:29:15,497 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-22 00:29:15,497 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-22 00:29:15,498 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-22 00:29:15,498 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-22 00:29:15,498 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-22 00:29:15,499 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-22 00:29:15,500 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-22 00:29:15,501 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-22 00:29:15,501 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-22 00:29:15,502 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-22 00:29:15,502 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-22 00:29:15,502 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-22 00:29:15,503 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-22 00:29:15,503 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-22 00:29:15,504 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-11-22 00:29:15,504 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-11-22 00:29:15,505 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-22 00:29:15,505 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-22 00:29:15,506 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2022-11-22 00:29:15,506 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-22 00:29:15,506 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-22 00:29:15,507 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-22 00:29:15,507 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2022-11-22 00:29:15,508 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2022-11-22 00:29:15,508 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2022-11-22 00:29:15,508 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-22 00:29:15,509 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2022-11-22 00:29:15,509 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-22 00:29:15,510 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-22 00:29:15,510 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-22 00:29:15,510 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-22 00:29:15,511 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-22 00:29:15,511 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-22 00:29:15,511 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-22 00:29:15,512 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-22 00:29:15,512 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-22 00:29:15,513 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-22 00:29:15,513 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-22 00:29:15,513 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_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> e0283c4a072a13e5b82b0728b718582152e385c6ee1404b3ed9be4e37b84a0b2 [2022-11-22 00:29:15,866 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-22 00:29:15,902 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-22 00:29:15,905 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-22 00:29:15,906 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-22 00:29:15,907 INFO L275 PluginConnector]: CDTParser initialized [2022-11-22 00:29:15,909 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/../../sv-benchmarks/c/array-memsafety/openbsd_cstrncmp-alloca-2.i [2022-11-22 00:29:19,239 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-22 00:29:19,503 INFO L351 CDTParser]: Found 1 translation units. [2022-11-22 00:29:19,503 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/sv-benchmarks/c/array-memsafety/openbsd_cstrncmp-alloca-2.i [2022-11-22 00:29:19,515 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/data/2bce58c72/0b0e681c4a534d57b370605bf9ff0c07/FLAG1014a4e35 [2022-11-22 00:29:19,531 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/data/2bce58c72/0b0e681c4a534d57b370605bf9ff0c07 [2022-11-22 00:29:19,533 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-22 00:29:19,535 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-22 00:29:19,536 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-22 00:29:19,537 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-22 00:29:19,545 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-22 00:29:19,546 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.11 12:29:19" (1/1) ... [2022-11-22 00:29:19,547 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7dddc4b5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:29:19, skipping insertion in model container [2022-11-22 00:29:19,547 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.11 12:29:19" (1/1) ... [2022-11-22 00:29:19,556 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-22 00:29:19,606 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-22 00:29:19,907 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-22 00:29:19,919 INFO L203 MainTranslator]: Completed pre-run [2022-11-22 00:29:19,960 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-22 00:29:19,987 INFO L208 MainTranslator]: Completed translation [2022-11-22 00:29:19,987 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:29:19 WrapperNode [2022-11-22 00:29:19,987 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-22 00:29:19,989 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-22 00:29:19,989 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-22 00:29:19,989 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-22 00:29:19,998 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:29:19" (1/1) ... [2022-11-22 00:29:20,011 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:29:19" (1/1) ... [2022-11-22 00:29:20,036 INFO L138 Inliner]: procedures = 117, calls = 18, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 103 [2022-11-22 00:29:20,037 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-22 00:29:20,038 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-22 00:29:20,038 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-22 00:29:20,038 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-22 00:29:20,049 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:29:19" (1/1) ... [2022-11-22 00:29:20,049 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:29:19" (1/1) ... [2022-11-22 00:29:20,053 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:29:19" (1/1) ... [2022-11-22 00:29:20,053 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:29:19" (1/1) ... [2022-11-22 00:29:20,060 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:29:19" (1/1) ... [2022-11-22 00:29:20,065 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:29:19" (1/1) ... [2022-11-22 00:29:20,067 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:29:19" (1/1) ... [2022-11-22 00:29:20,068 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:29:19" (1/1) ... [2022-11-22 00:29:20,070 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-22 00:29:20,072 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-22 00:29:20,072 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-22 00:29:20,072 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-22 00:29:20,073 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:29:19" (1/1) ... [2022-11-22 00:29:20,081 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-22 00:29:20,096 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 [2022-11-22 00:29:20,111 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-22 00:29:20,143 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-22 00:29:20,166 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-11-22 00:29:20,166 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-11-22 00:29:20,167 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-11-22 00:29:20,167 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-11-22 00:29:20,167 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-22 00:29:20,167 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-22 00:29:20,306 INFO L235 CfgBuilder]: Building ICFG [2022-11-22 00:29:20,308 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-22 00:29:20,669 INFO L276 CfgBuilder]: Performing block encoding [2022-11-22 00:29:20,808 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-22 00:29:20,809 INFO L300 CfgBuilder]: Removed 3 assume(true) statements. [2022-11-22 00:29:20,812 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 12:29:20 BoogieIcfgContainer [2022-11-22 00:29:20,812 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-22 00:29:20,819 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-22 00:29:20,819 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-22 00:29:20,824 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-22 00:29:20,824 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.11 12:29:19" (1/3) ... [2022-11-22 00:29:20,825 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@73558778 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.11 12:29:20, skipping insertion in model container [2022-11-22 00:29:20,825 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:29:19" (2/3) ... [2022-11-22 00:29:20,826 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@73558778 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.11 12:29:20, skipping insertion in model container [2022-11-22 00:29:20,826 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 12:29:20" (3/3) ... [2022-11-22 00:29:20,828 INFO L112 eAbstractionObserver]: Analyzing ICFG openbsd_cstrncmp-alloca-2.i [2022-11-22 00:29:20,871 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-22 00:29:20,872 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 19 error locations. [2022-11-22 00:29:20,929 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-22 00:29:20,937 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=false, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, 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;@40ab4493, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-22 00:29:20,938 INFO L358 AbstractCegarLoop]: Starting to check reachability of 19 error locations. [2022-11-22 00:29:20,943 INFO L276 IsEmpty]: Start isEmpty. Operand has 39 states, 19 states have (on average 2.3684210526315788) internal successors, (45), 38 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:29:20,952 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2022-11-22 00:29:20,952 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:29:20,953 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1] [2022-11-22 00:29:20,954 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-22 00:29:20,961 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:29:20,961 INFO L85 PathProgramCache]: Analyzing trace with hash 153537, now seen corresponding path program 1 times [2022-11-22 00:29:20,975 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:29:20,975 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [354996028] [2022-11-22 00:29:20,976 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:29:20,976 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:29:21,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:29:21,560 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 00:29:21,561 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:29:21,562 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [354996028] [2022-11-22 00:29:21,563 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [354996028] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 00:29:21,563 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-22 00:29:21,563 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2022-11-22 00:29:21,565 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1367395574] [2022-11-22 00:29:21,566 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 00:29:21,572 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-22 00:29:21,578 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 00:29:21,606 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-22 00:29:21,607 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-22 00:29:21,609 INFO L87 Difference]: Start difference. First operand has 39 states, 19 states have (on average 2.3684210526315788) internal successors, (45), 38 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:29:21,718 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 00:29:21,718 INFO L93 Difference]: Finished difference Result 37 states and 42 transitions. [2022-11-22 00:29:21,721 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-22 00:29:21,723 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 3 [2022-11-22 00:29:21,724 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 00:29:21,734 INFO L225 Difference]: With dead ends: 37 [2022-11-22 00:29:21,734 INFO L226 Difference]: Without dead ends: 36 [2022-11-22 00:29:21,737 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-22 00:29:21,746 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 37 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 27 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 28 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 27 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 00:29:21,751 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [37 Valid, 18 Invalid, 28 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 27 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 00:29:21,772 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2022-11-22 00:29:21,784 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2022-11-22 00:29:21,786 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 19 states have (on average 2.1578947368421053) internal successors, (41), 35 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:29:21,787 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 41 transitions. [2022-11-22 00:29:21,789 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 41 transitions. Word has length 3 [2022-11-22 00:29:21,789 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 00:29:21,789 INFO L495 AbstractCegarLoop]: Abstraction has 36 states and 41 transitions. [2022-11-22 00:29:21,790 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:29:21,790 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 41 transitions. [2022-11-22 00:29:21,790 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2022-11-22 00:29:21,791 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:29:21,791 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1] [2022-11-22 00:29:21,791 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-22 00:29:21,792 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-22 00:29:21,793 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:29:21,793 INFO L85 PathProgramCache]: Analyzing trace with hash 153538, now seen corresponding path program 1 times [2022-11-22 00:29:21,793 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:29:21,794 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [96454794] [2022-11-22 00:29:21,794 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:29:21,794 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:29:21,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:29:22,238 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 00:29:22,239 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:29:22,240 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [96454794] [2022-11-22 00:29:22,240 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [96454794] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 00:29:22,240 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-22 00:29:22,241 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-22 00:29:22,241 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2014629475] [2022-11-22 00:29:22,241 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 00:29:22,244 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-22 00:29:22,244 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 00:29:22,245 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-22 00:29:22,245 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-22 00:29:22,246 INFO L87 Difference]: Start difference. First operand 36 states and 41 transitions. Second operand has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:29:22,436 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 00:29:22,437 INFO L93 Difference]: Finished difference Result 70 states and 80 transitions. [2022-11-22 00:29:22,437 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-22 00:29:22,438 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 3 [2022-11-22 00:29:22,438 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 00:29:22,439 INFO L225 Difference]: With dead ends: 70 [2022-11-22 00:29:22,439 INFO L226 Difference]: Without dead ends: 70 [2022-11-22 00:29:22,440 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-11-22 00:29:22,442 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 38 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 67 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 55 SdHoareTripleChecker+Invalid, 67 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 67 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 00:29:22,443 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [38 Valid, 55 Invalid, 67 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 67 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 00:29:22,444 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2022-11-22 00:29:22,453 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 38. [2022-11-22 00:29:22,454 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 21 states have (on average 2.0952380952380953) internal successors, (44), 37 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:29:22,457 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 44 transitions. [2022-11-22 00:29:22,458 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 44 transitions. Word has length 3 [2022-11-22 00:29:22,459 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 00:29:22,459 INFO L495 AbstractCegarLoop]: Abstraction has 38 states and 44 transitions. [2022-11-22 00:29:22,459 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:29:22,460 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 44 transitions. [2022-11-22 00:29:22,460 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2022-11-22 00:29:22,461 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:29:22,461 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2022-11-22 00:29:22,461 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-11-22 00:29:22,462 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-22 00:29:22,462 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:29:22,462 INFO L85 PathProgramCache]: Analyzing trace with hash 4859024, now seen corresponding path program 1 times [2022-11-22 00:29:22,463 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:29:22,463 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1924254638] [2022-11-22 00:29:22,463 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:29:22,464 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:29:22,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:29:22,726 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 00:29:22,727 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:29:22,728 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1924254638] [2022-11-22 00:29:22,728 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1924254638] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 00:29:22,728 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-22 00:29:22,729 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-22 00:29:22,731 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1900984124] [2022-11-22 00:29:22,731 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 00:29:22,732 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-22 00:29:22,733 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 00:29:22,734 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-22 00:29:22,735 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-22 00:29:22,736 INFO L87 Difference]: Start difference. First operand 38 states and 44 transitions. Second operand has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:29:22,809 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 00:29:22,810 INFO L93 Difference]: Finished difference Result 37 states and 43 transitions. [2022-11-22 00:29:22,810 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-22 00:29:22,811 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2022-11-22 00:29:22,811 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 00:29:22,813 INFO L225 Difference]: With dead ends: 37 [2022-11-22 00:29:22,814 INFO L226 Difference]: Without dead ends: 37 [2022-11-22 00:29:22,814 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-22 00:29:22,822 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 39 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 23 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 00:29:22,823 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [39 Valid, 18 Invalid, 23 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 00:29:22,826 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2022-11-22 00:29:22,834 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2022-11-22 00:29:22,835 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 21 states have (on average 2.0476190476190474) internal successors, (43), 36 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:29:22,837 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 43 transitions. [2022-11-22 00:29:22,838 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 43 transitions. Word has length 4 [2022-11-22 00:29:22,838 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 00:29:22,839 INFO L495 AbstractCegarLoop]: Abstraction has 37 states and 43 transitions. [2022-11-22 00:29:22,840 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:29:22,840 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 43 transitions. [2022-11-22 00:29:22,840 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2022-11-22 00:29:22,840 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:29:22,841 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2022-11-22 00:29:22,841 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-11-22 00:29:22,841 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-22 00:29:22,843 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:29:22,844 INFO L85 PathProgramCache]: Analyzing trace with hash 4856286, now seen corresponding path program 1 times [2022-11-22 00:29:22,844 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:29:22,845 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [589285353] [2022-11-22 00:29:22,846 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:29:22,846 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:29:22,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:29:22,924 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 00:29:22,925 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:29:22,925 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [589285353] [2022-11-22 00:29:22,925 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [589285353] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 00:29:22,925 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-22 00:29:22,926 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2022-11-22 00:29:22,926 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1601242728] [2022-11-22 00:29:22,927 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 00:29:22,927 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-22 00:29:22,927 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 00:29:22,928 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-22 00:29:22,928 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-22 00:29:22,928 INFO L87 Difference]: Start difference. First operand 37 states and 43 transitions. Second operand has 3 states, 2 states have (on average 2.0) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:29:22,983 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 00:29:22,983 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2022-11-22 00:29:22,984 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-22 00:29:22,985 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2022-11-22 00:29:22,985 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 00:29:22,985 INFO L225 Difference]: With dead ends: 35 [2022-11-22 00:29:22,985 INFO L226 Difference]: Without dead ends: 35 [2022-11-22 00:29:22,987 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-22 00:29:22,997 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 33 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 24 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-22 00:29:22,999 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [33 Valid, 17 Invalid, 24 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 23 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-22 00:29:23,002 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2022-11-22 00:29:23,004 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2022-11-22 00:29:23,004 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 21 states have (on average 1.9523809523809523) internal successors, (41), 34 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:29:23,005 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 41 transitions. [2022-11-22 00:29:23,005 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 41 transitions. Word has length 4 [2022-11-22 00:29:23,005 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 00:29:23,006 INFO L495 AbstractCegarLoop]: Abstraction has 35 states and 41 transitions. [2022-11-22 00:29:23,006 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:29:23,006 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 41 transitions. [2022-11-22 00:29:23,006 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2022-11-22 00:29:23,006 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:29:23,007 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2022-11-22 00:29:23,007 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-11-22 00:29:23,007 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-22 00:29:23,008 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:29:23,008 INFO L85 PathProgramCache]: Analyzing trace with hash 4856287, now seen corresponding path program 1 times [2022-11-22 00:29:23,008 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:29:23,008 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2000725360] [2022-11-22 00:29:23,008 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:29:23,009 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:29:23,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:29:23,159 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 00:29:23,160 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:29:23,160 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2000725360] [2022-11-22 00:29:23,160 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2000725360] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 00:29:23,160 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-22 00:29:23,160 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-22 00:29:23,161 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2114860888] [2022-11-22 00:29:23,161 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 00:29:23,161 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-22 00:29:23,161 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 00:29:23,162 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-22 00:29:23,162 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-11-22 00:29:23,162 INFO L87 Difference]: Start difference. First operand 35 states and 41 transitions. Second operand has 5 states, 4 states have (on average 1.0) internal successors, (4), 4 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:29:23,275 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 00:29:23,275 INFO L93 Difference]: Finished difference Result 63 states and 73 transitions. [2022-11-22 00:29:23,276 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-22 00:29:23,276 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.0) internal successors, (4), 4 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2022-11-22 00:29:23,276 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 00:29:23,277 INFO L225 Difference]: With dead ends: 63 [2022-11-22 00:29:23,277 INFO L226 Difference]: Without dead ends: 63 [2022-11-22 00:29:23,278 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2022-11-22 00:29:23,278 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 100 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 65 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 100 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 65 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 65 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 00:29:23,279 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [100 Valid, 48 Invalid, 65 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 65 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 00:29:23,279 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2022-11-22 00:29:23,282 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 37. [2022-11-22 00:29:23,282 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 36 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:29:23,283 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 44 transitions. [2022-11-22 00:29:23,283 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 44 transitions. Word has length 4 [2022-11-22 00:29:23,283 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 00:29:23,283 INFO L495 AbstractCegarLoop]: Abstraction has 37 states and 44 transitions. [2022-11-22 00:29:23,284 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.0) internal successors, (4), 4 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:29:23,284 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 44 transitions. [2022-11-22 00:29:23,284 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2022-11-22 00:29:23,284 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:29:23,285 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1] [2022-11-22 00:29:23,285 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2022-11-22 00:29:23,285 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-22 00:29:23,286 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:29:23,286 INFO L85 PathProgramCache]: Analyzing trace with hash 147637247, now seen corresponding path program 1 times [2022-11-22 00:29:23,286 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:29:23,286 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1597781442] [2022-11-22 00:29:23,286 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:29:23,287 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:29:23,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:29:23,528 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 00:29:23,528 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:29:23,528 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1597781442] [2022-11-22 00:29:23,528 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1597781442] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 00:29:23,529 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1145199514] [2022-11-22 00:29:23,529 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:29:23,529 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:29:23,529 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 [2022-11-22 00:29:23,534 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 00:29:23,537 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-22 00:29:23,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:29:23,613 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-22 00:29:23,620 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 00:29:23,729 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 00:29:23,742 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 13 [2022-11-22 00:29:23,755 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2022-11-22 00:29:23,981 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 00:29:23,982 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 00:29:24,109 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 00:29:24,110 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1145199514] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 00:29:24,110 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1746553827] [2022-11-22 00:29:24,130 INFO L159 IcfgInterpreter]: Started Sifa with 4 locations of interest [2022-11-22 00:29:24,130 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 00:29:24,135 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 00:29:24,153 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 00:29:24,153 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 00:29:24,220 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 00:29:24,222 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-22 00:29:24,296 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-22 00:29:24,400 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:29:24,485 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:29:24,519 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 00:29:24,942 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '525#(and (not (<= (+ |ULTIMATE.start_main_~nondetString1~0#1.offset| |ULTIMATE.start_main_~i~0#1| 1) (select |#length| |ULTIMATE.start_main_~nondetString1~0#1.base|))) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc14#1.base|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 (+ 128 |ULTIMATE.start_main_#t~nondet16#1|)) (<= |ULTIMATE.start_main_#t~nondet16#1| 127) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.offset|) (<= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= 0 |#NULL.offset|) (= |ULTIMATE.start_main_#t~malloc14#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-22 00:29:24,942 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 00:29:24,942 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 00:29:24,942 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 9 [2022-11-22 00:29:24,942 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [447074220] [2022-11-22 00:29:24,942 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 00:29:24,943 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-11-22 00:29:24,943 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 00:29:24,943 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-11-22 00:29:24,944 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=138, Unknown=0, NotChecked=0, Total=182 [2022-11-22 00:29:24,944 INFO L87 Difference]: Start difference. First operand 37 states and 44 transitions. Second operand has 11 states, 10 states have (on average 1.5) internal successors, (15), 10 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:29:25,362 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 00:29:25,362 INFO L93 Difference]: Finished difference Result 99 states and 117 transitions. [2022-11-22 00:29:25,363 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-22 00:29:25,363 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 1.5) internal successors, (15), 10 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2022-11-22 00:29:25,363 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 00:29:25,364 INFO L225 Difference]: With dead ends: 99 [2022-11-22 00:29:25,364 INFO L226 Difference]: Without dead ends: 99 [2022-11-22 00:29:25,365 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=70, Invalid=202, Unknown=0, NotChecked=0, Total=272 [2022-11-22 00:29:25,365 INFO L413 NwaCegarLoop]: 48 mSDtfsCounter, 207 mSDsluCounter, 96 mSDsCounter, 0 mSdLazyCounter, 178 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 207 SdHoareTripleChecker+Valid, 144 SdHoareTripleChecker+Invalid, 184 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 178 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-22 00:29:25,366 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [207 Valid, 144 Invalid, 184 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 178 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-22 00:29:25,367 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2022-11-22 00:29:25,369 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 34. [2022-11-22 00:29:25,369 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 21 states have (on average 1.9047619047619047) internal successors, (40), 33 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:29:25,370 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 40 transitions. [2022-11-22 00:29:25,370 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 40 transitions. Word has length 5 [2022-11-22 00:29:25,370 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 00:29:25,370 INFO L495 AbstractCegarLoop]: Abstraction has 34 states and 40 transitions. [2022-11-22 00:29:25,371 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 1.5) internal successors, (15), 10 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:29:25,371 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 40 transitions. [2022-11-22 00:29:25,372 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2022-11-22 00:29:25,372 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:29:25,372 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2022-11-22 00:29:25,381 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-22 00:29:25,579 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2022-11-22 00:29:25,580 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-22 00:29:25,580 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:29:25,581 INFO L85 PathProgramCache]: Analyzing trace with hash 150629738, now seen corresponding path program 1 times [2022-11-22 00:29:25,581 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:29:25,581 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [924031265] [2022-11-22 00:29:25,581 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:29:25,581 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:29:25,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:29:25,888 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 00:29:25,888 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:29:25,888 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [924031265] [2022-11-22 00:29:25,889 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [924031265] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 00:29:25,889 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-22 00:29:25,889 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-22 00:29:25,889 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1358887970] [2022-11-22 00:29:25,889 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 00:29:25,890 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-22 00:29:25,890 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 00:29:25,891 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-22 00:29:25,891 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2022-11-22 00:29:25,891 INFO L87 Difference]: Start difference. First operand 34 states and 40 transitions. Second operand has 5 states, 4 states have (on average 1.25) internal successors, (5), 4 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:29:25,941 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 00:29:25,941 INFO L93 Difference]: Finished difference Result 33 states and 39 transitions. [2022-11-22 00:29:25,942 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-22 00:29:25,942 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.25) internal successors, (5), 4 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2022-11-22 00:29:25,942 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 00:29:25,944 INFO L225 Difference]: With dead ends: 33 [2022-11-22 00:29:25,944 INFO L226 Difference]: Without dead ends: 33 [2022-11-22 00:29:25,944 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2022-11-22 00:29:25,946 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 67 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 22 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-22 00:29:25,946 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [67 Valid, 16 Invalid, 22 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 20 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-22 00:29:25,947 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2022-11-22 00:29:25,955 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2022-11-22 00:29:25,957 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 21 states have (on average 1.8571428571428572) internal successors, (39), 32 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:29:25,958 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 39 transitions. [2022-11-22 00:29:25,959 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 39 transitions. Word has length 5 [2022-11-22 00:29:25,959 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 00:29:25,959 INFO L495 AbstractCegarLoop]: Abstraction has 33 states and 39 transitions. [2022-11-22 00:29:25,959 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.25) internal successors, (5), 4 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:29:25,964 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 39 transitions. [2022-11-22 00:29:25,965 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-11-22 00:29:25,965 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:29:25,966 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1] [2022-11-22 00:29:25,966 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2022-11-22 00:29:25,966 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-22 00:29:25,967 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:29:25,968 INFO L85 PathProgramCache]: Analyzing trace with hash 371993096, now seen corresponding path program 1 times [2022-11-22 00:29:25,968 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:29:25,970 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [656179703] [2022-11-22 00:29:25,970 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:29:25,971 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:29:25,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:29:26,238 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 00:29:26,239 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:29:26,239 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [656179703] [2022-11-22 00:29:26,239 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [656179703] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 00:29:26,240 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1379286815] [2022-11-22 00:29:26,240 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:29:26,240 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:29:26,240 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 [2022-11-22 00:29:26,243 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 00:29:26,255 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-22 00:29:26,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:29:26,339 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 16 conjunts are in the unsatisfiable core [2022-11-22 00:29:26,341 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 00:29:26,396 INFO L321 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2022-11-22 00:29:26,396 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 17 [2022-11-22 00:29:26,613 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 00:29:26,613 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 00:29:26,820 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 00:29:26,821 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1379286815] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 00:29:26,821 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [956340215] [2022-11-22 00:29:26,823 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2022-11-22 00:29:26,824 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 00:29:26,824 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 00:29:26,826 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 00:29:26,826 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 00:29:26,868 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 00:29:26,872 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-22 00:29:26,933 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:29:27,023 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:29:27,040 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 00:29:27,624 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '782#(and (not (<= (+ |ULTIMATE.start_main_~nondetString2~0#1.offset| |ULTIMATE.start_main_~i~1#1| 1) (select |#length| |ULTIMATE.start_main_~nondetString2~0#1.base|))) (= |ULTIMATE.start_main_~i~0#1| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc14#1.base|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_~length1~0#1| 1) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 (+ 128 |ULTIMATE.start_main_#t~nondet18#1|)) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |#NULL.offset| 0) (<= |ULTIMATE.start_main_#t~nondet18#1| 127) (< (+ |ULTIMATE.start_main_~i~1#1| 1) |ULTIMATE.start_main_~length2~0#1|) (= |ULTIMATE.start_main_#t~malloc14#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-22 00:29:27,624 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 00:29:27,624 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 00:29:27,624 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 12 [2022-11-22 00:29:27,625 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2032362021] [2022-11-22 00:29:27,625 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 00:29:27,625 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-11-22 00:29:27,625 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 00:29:27,626 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-11-22 00:29:27,626 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=237, Unknown=0, NotChecked=0, Total=306 [2022-11-22 00:29:27,626 INFO L87 Difference]: Start difference. First operand 33 states and 39 transitions. Second operand has 14 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 13 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:29:27,998 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 00:29:27,998 INFO L93 Difference]: Finished difference Result 83 states and 96 transitions. [2022-11-22 00:29:27,999 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-22 00:29:27,999 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 13 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2022-11-22 00:29:27,999 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 00:29:28,000 INFO L225 Difference]: With dead ends: 83 [2022-11-22 00:29:28,000 INFO L226 Difference]: Without dead ends: 83 [2022-11-22 00:29:28,000 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 95 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=104, Invalid=316, Unknown=0, NotChecked=0, Total=420 [2022-11-22 00:29:28,001 INFO L413 NwaCegarLoop]: 46 mSDtfsCounter, 222 mSDsluCounter, 110 mSDsCounter, 0 mSdLazyCounter, 170 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 222 SdHoareTripleChecker+Valid, 156 SdHoareTripleChecker+Invalid, 177 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 170 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 00:29:28,001 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [222 Valid, 156 Invalid, 177 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 170 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 00:29:28,002 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2022-11-22 00:29:28,004 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 30. [2022-11-22 00:29:28,004 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 19 states have (on average 1.8421052631578947) internal successors, (35), 29 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:29:28,004 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 35 transitions. [2022-11-22 00:29:28,005 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 35 transitions. Word has length 6 [2022-11-22 00:29:28,005 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 00:29:28,005 INFO L495 AbstractCegarLoop]: Abstraction has 30 states and 35 transitions. [2022-11-22 00:29:28,005 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 13 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:29:28,005 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 35 transitions. [2022-11-22 00:29:28,006 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-11-22 00:29:28,006 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:29:28,006 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2022-11-22 00:29:28,020 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-22 00:29:28,213 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2022-11-22 00:29:28,213 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr8REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-22 00:29:28,214 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:29:28,214 INFO L85 PathProgramCache]: Analyzing trace with hash -1273649236, now seen corresponding path program 1 times [2022-11-22 00:29:28,215 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:29:28,215 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1316368714] [2022-11-22 00:29:28,215 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:29:28,215 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:29:28,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:29:28,273 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 00:29:28,273 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:29:28,273 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1316368714] [2022-11-22 00:29:28,274 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1316368714] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 00:29:28,274 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-22 00:29:28,274 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-22 00:29:28,274 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [276105105] [2022-11-22 00:29:28,275 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 00:29:28,275 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-22 00:29:28,275 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 00:29:28,276 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-22 00:29:28,276 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-22 00:29:28,276 INFO L87 Difference]: Start difference. First operand 30 states and 35 transitions. Second operand has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 4 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:29:28,330 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 00:29:28,331 INFO L93 Difference]: Finished difference Result 28 states and 33 transitions. [2022-11-22 00:29:28,331 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-22 00:29:28,332 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 4 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2022-11-22 00:29:28,332 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 00:29:28,332 INFO L225 Difference]: With dead ends: 28 [2022-11-22 00:29:28,332 INFO L226 Difference]: Without dead ends: 28 [2022-11-22 00:29:28,333 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-11-22 00:29:28,334 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 49 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-22 00:29:28,334 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [49 Valid, 15 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 30 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-22 00:29:28,335 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2022-11-22 00:29:28,336 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2022-11-22 00:29:28,336 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 19 states have (on average 1.736842105263158) internal successors, (33), 27 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:29:28,337 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 33 transitions. [2022-11-22 00:29:28,337 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 33 transitions. Word has length 7 [2022-11-22 00:29:28,338 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 00:29:28,338 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 33 transitions. [2022-11-22 00:29:28,338 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 4 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:29:28,338 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 33 transitions. [2022-11-22 00:29:28,339 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-11-22 00:29:28,339 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:29:28,339 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2022-11-22 00:29:28,339 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2022-11-22 00:29:28,340 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-22 00:29:28,340 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:29:28,340 INFO L85 PathProgramCache]: Analyzing trace with hash -1273649235, now seen corresponding path program 1 times [2022-11-22 00:29:28,341 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:29:28,341 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1025613182] [2022-11-22 00:29:28,341 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:29:28,341 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:29:28,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:29:28,432 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 00:29:28,432 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:29:28,432 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1025613182] [2022-11-22 00:29:28,433 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1025613182] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 00:29:28,433 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-22 00:29:28,433 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-22 00:29:28,433 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1590297890] [2022-11-22 00:29:28,434 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 00:29:28,434 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-22 00:29:28,434 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 00:29:28,435 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-22 00:29:28,435 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-11-22 00:29:28,435 INFO L87 Difference]: Start difference. First operand 28 states and 33 transitions. Second operand has 5 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:29:28,505 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 00:29:28,505 INFO L93 Difference]: Finished difference Result 40 states and 45 transitions. [2022-11-22 00:29:28,506 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-22 00:29:28,506 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2022-11-22 00:29:28,506 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 00:29:28,506 INFO L225 Difference]: With dead ends: 40 [2022-11-22 00:29:28,507 INFO L226 Difference]: Without dead ends: 40 [2022-11-22 00:29:28,507 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2022-11-22 00:29:28,508 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 56 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 56 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 39 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 00:29:28,508 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [56 Valid, 26 Invalid, 39 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 00:29:28,509 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2022-11-22 00:29:28,510 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 32. [2022-11-22 00:29:28,511 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 23 states have (on average 1.7391304347826086) internal successors, (40), 31 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:29:28,511 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 40 transitions. [2022-11-22 00:29:28,511 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 40 transitions. Word has length 7 [2022-11-22 00:29:28,512 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 00:29:28,512 INFO L495 AbstractCegarLoop]: Abstraction has 32 states and 40 transitions. [2022-11-22 00:29:28,512 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:29:28,512 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 40 transitions. [2022-11-22 00:29:28,513 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2022-11-22 00:29:28,513 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:29:28,513 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 00:29:28,513 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2022-11-22 00:29:28,514 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr18ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-22 00:29:28,514 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:29:28,514 INFO L85 PathProgramCache]: Analyzing trace with hash -828421257, now seen corresponding path program 1 times [2022-11-22 00:29:28,515 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:29:28,515 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [565279722] [2022-11-22 00:29:28,515 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:29:28,515 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:29:28,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:29:28,689 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 00:29:28,690 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:29:28,690 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [565279722] [2022-11-22 00:29:28,690 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [565279722] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 00:29:28,690 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-22 00:29:28,690 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-22 00:29:28,691 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2065718714] [2022-11-22 00:29:28,691 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 00:29:28,692 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-22 00:29:28,692 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 00:29:28,692 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-22 00:29:28,693 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-22 00:29:28,693 INFO L87 Difference]: Start difference. First operand 32 states and 40 transitions. Second operand has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:29:28,733 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 00:29:28,733 INFO L93 Difference]: Finished difference Result 31 states and 39 transitions. [2022-11-22 00:29:28,733 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-22 00:29:28,734 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2022-11-22 00:29:28,734 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 00:29:28,735 INFO L225 Difference]: With dead ends: 31 [2022-11-22 00:29:28,735 INFO L226 Difference]: Without dead ends: 28 [2022-11-22 00:29:28,735 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-22 00:29:28,736 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 25 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 34 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-22 00:29:28,736 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [25 Valid, 30 Invalid, 34 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-22 00:29:28,737 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2022-11-22 00:29:28,740 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2022-11-22 00:29:28,740 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 20 states have (on average 1.65) internal successors, (33), 27 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:29:28,744 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 33 transitions. [2022-11-22 00:29:28,744 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 33 transitions. Word has length 8 [2022-11-22 00:29:28,744 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 00:29:28,744 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 33 transitions. [2022-11-22 00:29:28,745 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:29:28,745 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 33 transitions. [2022-11-22 00:29:28,746 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2022-11-22 00:29:28,746 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:29:28,746 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 00:29:28,746 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2022-11-22 00:29:28,747 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr10REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-22 00:29:28,747 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:29:28,747 INFO L85 PathProgramCache]: Analyzing trace with hash -828418907, now seen corresponding path program 1 times [2022-11-22 00:29:28,747 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:29:28,748 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [931098899] [2022-11-22 00:29:28,748 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:29:28,748 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:29:28,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:29:28,817 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 00:29:28,817 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:29:28,817 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [931098899] [2022-11-22 00:29:28,817 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [931098899] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 00:29:28,817 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-22 00:29:28,818 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-22 00:29:28,818 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1869835434] [2022-11-22 00:29:28,818 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 00:29:28,819 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-22 00:29:28,819 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 00:29:28,820 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-22 00:29:28,820 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-22 00:29:28,820 INFO L87 Difference]: Start difference. First operand 28 states and 33 transitions. Second operand has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:29:28,861 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 00:29:28,861 INFO L93 Difference]: Finished difference Result 27 states and 31 transitions. [2022-11-22 00:29:28,861 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-22 00:29:28,862 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2022-11-22 00:29:28,862 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 00:29:28,862 INFO L225 Difference]: With dead ends: 27 [2022-11-22 00:29:28,863 INFO L226 Difference]: Without dead ends: 27 [2022-11-22 00:29:28,863 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-11-22 00:29:28,865 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 15 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-22 00:29:28,865 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 21 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-22 00:29:28,866 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2022-11-22 00:29:28,867 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2022-11-22 00:29:28,868 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 20 states have (on average 1.55) internal successors, (31), 26 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:29:28,868 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 31 transitions. [2022-11-22 00:29:28,869 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 31 transitions. Word has length 8 [2022-11-22 00:29:28,869 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 00:29:28,869 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 31 transitions. [2022-11-22 00:29:28,869 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:29:28,870 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 31 transitions. [2022-11-22 00:29:28,870 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2022-11-22 00:29:28,870 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:29:28,870 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 00:29:28,871 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2022-11-22 00:29:28,871 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-22 00:29:28,872 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:29:28,872 INFO L85 PathProgramCache]: Analyzing trace with hash -828418906, now seen corresponding path program 1 times [2022-11-22 00:29:28,872 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:29:28,872 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1946676873] [2022-11-22 00:29:28,873 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:29:28,873 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:29:28,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:29:29,073 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 00:29:29,074 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:29:29,074 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1946676873] [2022-11-22 00:29:29,074 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1946676873] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 00:29:29,074 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-22 00:29:29,075 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-22 00:29:29,075 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [42192343] [2022-11-22 00:29:29,075 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 00:29:29,075 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-22 00:29:29,075 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 00:29:29,076 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-22 00:29:29,076 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-22 00:29:29,076 INFO L87 Difference]: Start difference. First operand 27 states and 31 transitions. Second operand has 5 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:29:29,140 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 00:29:29,141 INFO L93 Difference]: Finished difference Result 27 states and 30 transitions. [2022-11-22 00:29:29,141 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-22 00:29:29,141 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2022-11-22 00:29:29,142 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 00:29:29,142 INFO L225 Difference]: With dead ends: 27 [2022-11-22 00:29:29,142 INFO L226 Difference]: Without dead ends: 27 [2022-11-22 00:29:29,142 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2022-11-22 00:29:29,143 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 26 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 45 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 45 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 45 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-22 00:29:29,144 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [26 Valid, 28 Invalid, 45 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 45 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-22 00:29:29,144 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2022-11-22 00:29:29,145 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2022-11-22 00:29:29,145 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 20 states have (on average 1.5) internal successors, (30), 26 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:29:29,146 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 30 transitions. [2022-11-22 00:29:29,146 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 30 transitions. Word has length 8 [2022-11-22 00:29:29,146 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 00:29:29,146 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 30 transitions. [2022-11-22 00:29:29,146 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:29:29,147 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 30 transitions. [2022-11-22 00:29:29,147 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-11-22 00:29:29,147 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:29:29,147 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 00:29:29,148 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2022-11-22 00:29:29,148 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr16REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-22 00:29:29,148 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:29:29,148 INFO L85 PathProgramCache]: Analyzing trace with hash -1541618106, now seen corresponding path program 1 times [2022-11-22 00:29:29,149 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:29:29,149 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1985020654] [2022-11-22 00:29:29,149 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:29:29,149 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:29:29,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:29:29,190 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 00:29:29,190 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:29:29,190 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1985020654] [2022-11-22 00:29:29,191 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1985020654] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 00:29:29,191 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-22 00:29:29,191 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-22 00:29:29,191 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [311730690] [2022-11-22 00:29:29,191 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 00:29:29,192 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-22 00:29:29,192 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 00:29:29,192 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-22 00:29:29,193 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-22 00:29:29,193 INFO L87 Difference]: Start difference. First operand 27 states and 30 transitions. Second operand has 4 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:29:29,243 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 00:29:29,243 INFO L93 Difference]: Finished difference Result 26 states and 29 transitions. [2022-11-22 00:29:29,244 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-22 00:29:29,244 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2022-11-22 00:29:29,244 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 00:29:29,244 INFO L225 Difference]: With dead ends: 26 [2022-11-22 00:29:29,245 INFO L226 Difference]: Without dead ends: 26 [2022-11-22 00:29:29,245 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-11-22 00:29:29,246 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 13 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 40 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-22 00:29:29,246 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 18 Invalid, 40 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 39 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-22 00:29:29,246 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2022-11-22 00:29:29,247 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2022-11-22 00:29:29,248 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 20 states have (on average 1.45) internal successors, (29), 25 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:29:29,248 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 29 transitions. [2022-11-22 00:29:29,248 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 29 transitions. Word has length 10 [2022-11-22 00:29:29,248 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 00:29:29,248 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 29 transitions. [2022-11-22 00:29:29,249 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:29:29,249 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 29 transitions. [2022-11-22 00:29:29,249 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-11-22 00:29:29,249 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:29:29,250 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 00:29:29,250 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2022-11-22 00:29:29,250 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr17REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-22 00:29:29,251 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:29:29,251 INFO L85 PathProgramCache]: Analyzing trace with hash -1541618105, now seen corresponding path program 1 times [2022-11-22 00:29:29,251 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:29:29,251 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [342147777] [2022-11-22 00:29:29,251 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:29:29,252 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:29:29,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:29:29,354 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 00:29:29,354 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:29:29,355 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [342147777] [2022-11-22 00:29:29,355 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [342147777] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 00:29:29,355 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-22 00:29:29,355 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-22 00:29:29,355 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1969455081] [2022-11-22 00:29:29,356 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 00:29:29,356 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-22 00:29:29,356 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 00:29:29,356 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-22 00:29:29,357 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-11-22 00:29:29,357 INFO L87 Difference]: Start difference. First operand 26 states and 29 transitions. Second operand has 6 states, 5 states have (on average 2.0) internal successors, (10), 5 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:29:29,432 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 00:29:29,432 INFO L93 Difference]: Finished difference Result 31 states and 33 transitions. [2022-11-22 00:29:29,433 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-22 00:29:29,433 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 2.0) internal successors, (10), 5 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2022-11-22 00:29:29,433 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 00:29:29,433 INFO L225 Difference]: With dead ends: 31 [2022-11-22 00:29:29,433 INFO L226 Difference]: Without dead ends: 31 [2022-11-22 00:29:29,434 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2022-11-22 00:29:29,434 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 36 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 63 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 31 SdHoareTripleChecker+Invalid, 63 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 63 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 00:29:29,434 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [36 Valid, 31 Invalid, 63 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 63 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 00:29:29,435 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2022-11-22 00:29:29,436 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 27. [2022-11-22 00:29:29,436 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 21 states have (on average 1.4285714285714286) internal successors, (30), 26 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:29:29,436 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 30 transitions. [2022-11-22 00:29:29,436 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 30 transitions. Word has length 10 [2022-11-22 00:29:29,437 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 00:29:29,437 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 30 transitions. [2022-11-22 00:29:29,437 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 2.0) internal successors, (10), 5 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:29:29,437 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 30 transitions. [2022-11-22 00:29:29,437 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-11-22 00:29:29,437 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:29:29,437 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 00:29:29,438 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2022-11-22 00:29:29,438 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr14REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-22 00:29:29,438 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:29:29,438 INFO L85 PathProgramCache]: Analyzing trace with hash -545529691, now seen corresponding path program 1 times [2022-11-22 00:29:29,438 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:29:29,439 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [967045419] [2022-11-22 00:29:29,439 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:29:29,439 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:29:29,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:29:29,504 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 00:29:29,504 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:29:29,504 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [967045419] [2022-11-22 00:29:29,504 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [967045419] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 00:29:29,505 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-22 00:29:29,505 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-22 00:29:29,505 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1908130173] [2022-11-22 00:29:29,505 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 00:29:29,505 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-22 00:29:29,506 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 00:29:29,506 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-22 00:29:29,506 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-22 00:29:29,506 INFO L87 Difference]: Start difference. First operand 27 states and 30 transitions. Second operand has 4 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 4 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:29:29,539 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 00:29:29,539 INFO L93 Difference]: Finished difference Result 26 states and 29 transitions. [2022-11-22 00:29:29,543 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-22 00:29:29,543 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 4 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2022-11-22 00:29:29,543 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 00:29:29,544 INFO L225 Difference]: With dead ends: 26 [2022-11-22 00:29:29,544 INFO L226 Difference]: Without dead ends: 26 [2022-11-22 00:29:29,544 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-11-22 00:29:29,546 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 10 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 30 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-22 00:29:29,549 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 23 Invalid, 30 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 29 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-22 00:29:29,550 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2022-11-22 00:29:29,551 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2022-11-22 00:29:29,551 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 21 states have (on average 1.380952380952381) internal successors, (29), 25 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:29:29,552 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 29 transitions. [2022-11-22 00:29:29,552 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 29 transitions. Word has length 11 [2022-11-22 00:29:29,552 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 00:29:29,552 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 29 transitions. [2022-11-22 00:29:29,553 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 4 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:29:29,553 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 29 transitions. [2022-11-22 00:29:29,553 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-11-22 00:29:29,554 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:29:29,554 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 00:29:29,554 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2022-11-22 00:29:29,554 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-22 00:29:29,555 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:29:29,555 INFO L85 PathProgramCache]: Analyzing trace with hash -545529690, now seen corresponding path program 1 times [2022-11-22 00:29:29,555 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:29:29,555 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1911625993] [2022-11-22 00:29:29,555 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:29:29,555 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:29:29,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:29:29,801 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 00:29:29,802 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:29:29,802 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1911625993] [2022-11-22 00:29:29,802 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1911625993] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 00:29:29,802 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-22 00:29:29,802 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-22 00:29:29,802 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1631008869] [2022-11-22 00:29:29,803 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 00:29:29,803 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-22 00:29:29,803 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 00:29:29,803 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-22 00:29:29,804 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2022-11-22 00:29:29,804 INFO L87 Difference]: Start difference. First operand 26 states and 29 transitions. Second operand has 7 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 6 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:29:29,945 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 00:29:29,945 INFO L93 Difference]: Finished difference Result 31 states and 33 transitions. [2022-11-22 00:29:29,945 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-22 00:29:29,946 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 6 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2022-11-22 00:29:29,946 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 00:29:29,946 INFO L225 Difference]: With dead ends: 31 [2022-11-22 00:29:29,946 INFO L226 Difference]: Without dead ends: 29 [2022-11-22 00:29:29,946 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=80, Unknown=0, NotChecked=0, Total=110 [2022-11-22 00:29:29,947 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 35 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 94 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 22 SdHoareTripleChecker+Invalid, 95 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 94 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 00:29:29,947 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [35 Valid, 22 Invalid, 95 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 94 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 00:29:29,947 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2022-11-22 00:29:29,948 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 25. [2022-11-22 00:29:29,948 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 20 states have (on average 1.35) internal successors, (27), 24 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:29:29,949 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 27 transitions. [2022-11-22 00:29:29,949 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 27 transitions. Word has length 11 [2022-11-22 00:29:29,949 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 00:29:29,949 INFO L495 AbstractCegarLoop]: Abstraction has 25 states and 27 transitions. [2022-11-22 00:29:29,949 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 6 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:29:29,949 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 27 transitions. [2022-11-22 00:29:29,949 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-11-22 00:29:29,950 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:29:29,950 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 00:29:29,950 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2022-11-22 00:29:29,950 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-22 00:29:29,950 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:29:29,950 INFO L85 PathProgramCache]: Analyzing trace with hash -259611982, now seen corresponding path program 1 times [2022-11-22 00:29:29,951 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:29:29,951 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1719735734] [2022-11-22 00:29:29,951 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:29:29,951 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:29:29,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:29:30,217 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 00:29:30,218 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:29:30,218 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1719735734] [2022-11-22 00:29:30,218 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1719735734] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 00:29:30,218 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-22 00:29:30,219 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-11-22 00:29:30,219 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1993145564] [2022-11-22 00:29:30,219 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 00:29:30,219 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-11-22 00:29:30,219 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 00:29:30,220 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-11-22 00:29:30,220 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2022-11-22 00:29:30,220 INFO L87 Difference]: Start difference. First operand 25 states and 27 transitions. Second operand has 8 states, 8 states have (on average 1.625) internal successors, (13), 7 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:29:30,409 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 00:29:30,409 INFO L93 Difference]: Finished difference Result 37 states and 40 transitions. [2022-11-22 00:29:30,409 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-11-22 00:29:30,409 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.625) internal successors, (13), 7 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2022-11-22 00:29:30,409 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 00:29:30,410 INFO L225 Difference]: With dead ends: 37 [2022-11-22 00:29:30,410 INFO L226 Difference]: Without dead ends: 27 [2022-11-22 00:29:30,410 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=49, Invalid=107, Unknown=0, NotChecked=0, Total=156 [2022-11-22 00:29:30,411 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 27 mSDsluCounter, 58 mSDsCounter, 0 mSdLazyCounter, 93 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 67 SdHoareTripleChecker+Invalid, 94 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 93 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 00:29:30,411 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [27 Valid, 67 Invalid, 94 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 93 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 00:29:30,411 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2022-11-22 00:29:30,412 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 26. [2022-11-22 00:29:30,412 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 21 states have (on average 1.3333333333333333) internal successors, (28), 25 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:29:30,412 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2022-11-22 00:29:30,412 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 13 [2022-11-22 00:29:30,412 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 00:29:30,412 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2022-11-22 00:29:30,413 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 1.625) internal successors, (13), 7 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:29:30,413 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2022-11-22 00:29:30,413 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-11-22 00:29:30,413 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:29:30,413 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 00:29:30,413 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2022-11-22 00:29:30,413 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-22 00:29:30,414 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:29:30,414 INFO L85 PathProgramCache]: Analyzing trace with hash -88562001, now seen corresponding path program 1 times [2022-11-22 00:29:30,414 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:29:30,414 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1421562857] [2022-11-22 00:29:30,414 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:29:30,414 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:29:30,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:29:30,610 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 00:29:30,611 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:29:30,611 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1421562857] [2022-11-22 00:29:30,611 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1421562857] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 00:29:30,611 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1608146599] [2022-11-22 00:29:30,611 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:29:30,611 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:29:30,611 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 [2022-11-22 00:29:30,615 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 00:29:30,639 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-22 00:29:30,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:29:30,707 INFO L263 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-22 00:29:30,708 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 00:29:30,811 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 00:29:30,811 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 00:29:30,941 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2022-11-22 00:29:30,965 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 00:29:30,965 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1608146599] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 00:29:30,966 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1426966852] [2022-11-22 00:29:30,968 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-22 00:29:30,968 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 00:29:30,968 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 00:29:30,968 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 00:29:30,968 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 00:29:31,015 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 00:29:31,019 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-22 00:29:31,060 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-22 00:29:31,151 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:29:31,200 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:29:31,251 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:29:31,324 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-22 00:29:31,324 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-22 00:29:31,567 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 00:29:34,689 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [1426966852] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 00:29:34,689 INFO L184 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2022-11-22 00:29:34,690 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [7, 6, 6] total 28 [2022-11-22 00:29:34,690 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2131501315] [2022-11-22 00:29:34,690 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 00:29:34,691 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-11-22 00:29:34,691 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 00:29:34,691 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-11-22 00:29:34,692 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=683, Unknown=0, NotChecked=0, Total=812 [2022-11-22 00:29:34,692 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand has 13 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 12 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:29:34,911 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 00:29:34,911 INFO L93 Difference]: Finished difference Result 36 states and 38 transitions. [2022-11-22 00:29:34,911 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-22 00:29:34,911 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 12 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2022-11-22 00:29:34,912 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 00:29:34,912 INFO L225 Difference]: With dead ends: 36 [2022-11-22 00:29:34,912 INFO L226 Difference]: Without dead ends: 28 [2022-11-22 00:29:34,912 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 20 SyntacticMatches, 3 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 214 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=129, Invalid=683, Unknown=0, NotChecked=0, Total=812 [2022-11-22 00:29:34,913 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 32 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 118 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 119 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 118 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 00:29:34,913 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [32 Valid, 33 Invalid, 119 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 118 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 00:29:34,914 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2022-11-22 00:29:34,914 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2022-11-22 00:29:34,915 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 22 states have (on average 1.3181818181818181) internal successors, (29), 26 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:29:34,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 29 transitions. [2022-11-22 00:29:34,915 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 29 transitions. Word has length 15 [2022-11-22 00:29:34,915 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 00:29:34,915 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 29 transitions. [2022-11-22 00:29:34,915 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 12 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:29:34,916 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 29 transitions. [2022-11-22 00:29:34,916 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-11-22 00:29:34,916 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:29:34,916 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 00:29:34,921 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-22 00:29:35,116 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:29:35,117 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-22 00:29:35,117 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:29:35,117 INFO L85 PathProgramCache]: Analyzing trace with hash 1434102118, now seen corresponding path program 1 times [2022-11-22 00:29:35,117 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:29:35,117 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1991080216] [2022-11-22 00:29:35,117 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:29:35,118 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:29:35,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:29:35,356 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-22 00:29:35,356 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:29:35,356 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1991080216] [2022-11-22 00:29:35,356 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1991080216] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 00:29:35,357 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1304227242] [2022-11-22 00:29:35,357 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:29:35,357 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:29:35,357 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 [2022-11-22 00:29:35,358 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 00:29:35,387 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-22 00:29:35,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:29:35,454 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-22 00:29:35,456 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 00:29:35,549 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-22 00:29:35,549 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 00:29:35,677 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2022-11-22 00:29:35,706 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-22 00:29:35,707 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1304227242] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 00:29:35,707 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2020372245] [2022-11-22 00:29:35,712 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-11-22 00:29:35,712 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 00:29:35,712 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 00:29:35,713 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 00:29:35,713 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 00:29:35,750 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 00:29:35,752 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-22 00:29:35,794 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-22 00:29:35,877 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:29:35,946 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:29:35,991 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-22 00:29:36,068 INFO L321 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-11-22 00:29:36,068 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 84 treesize of output 83 [2022-11-22 00:29:36,123 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:29:36,148 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:29:36,203 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-22 00:29:36,204 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-22 00:29:37,526 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 00:29:41,410 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1860#(and (<= |ULTIMATE.start_cstrncmp_~s1#1.offset| (select |#length| |ULTIMATE.start_cstrncmp_~s1#1.base|)) (<= 0 |#NULL.base|) (<= 1 |ULTIMATE.start_cstrncmp_~s1#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc14#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc14#1.base|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (= (select |#valid| |ULTIMATE.start_cstrncmp_~s1#1.base|) 1) (<= |ULTIMATE.start_cstrncmp_~n#1| 2147483646) (<= |ULTIMATE.start_main_#t~nondet19#1| 2147483647) (<= 0 |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (not (= (mod |ULTIMATE.start_cstrncmp_~n#1| 4294967296) 0)) (not (= (select (select |#memory_int| |ULTIMATE.start_cstrncmp_~s1#1.base|) (+ (- 1) |ULTIMATE.start_cstrncmp_~s1#1.offset|)) 0)) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.offset|) (<= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_cstrncmp_~s2#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_cstrncmp_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#in~s1#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrncmp_~s1#1.base|) (<= 0 (+ 2147483648 |ULTIMATE.start_main_#t~nondet19#1|)) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |#NULL.base| 0) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrncmp_#in~n#1| 2147483647) (not (<= (+ |ULTIMATE.start_cstrncmp_~s1#1.offset| 1) (select |#length| |ULTIMATE.start_cstrncmp_~s1#1.base|))) (<= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= 0 (+ |ULTIMATE.start_cstrncmp_#in~n#1| 2147483648)) (<= 0 |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (<= 0 |#NULL.offset|) (<= |ULTIMATE.start_main_#t~malloc14#1.offset| 0) (<= |ULTIMATE.start_cstrncmp_#in~s1#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrncmp_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|))' at error location [2022-11-22 00:29:41,410 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 00:29:41,410 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 00:29:41,410 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 6] total 16 [2022-11-22 00:29:41,411 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [722497561] [2022-11-22 00:29:41,411 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 00:29:41,411 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-11-22 00:29:41,411 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 00:29:41,412 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-11-22 00:29:41,412 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=864, Unknown=0, NotChecked=0, Total=992 [2022-11-22 00:29:41,413 INFO L87 Difference]: Start difference. First operand 27 states and 29 transitions. Second operand has 18 states, 17 states have (on average 2.411764705882353) internal successors, (41), 17 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:29:41,699 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 00:29:41,700 INFO L93 Difference]: Finished difference Result 36 states and 38 transitions. [2022-11-22 00:29:41,700 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-11-22 00:29:41,700 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 2.411764705882353) internal successors, (41), 17 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2022-11-22 00:29:41,700 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 00:29:41,701 INFO L225 Difference]: With dead ends: 36 [2022-11-22 00:29:41,701 INFO L226 Difference]: Without dead ends: 36 [2022-11-22 00:29:41,702 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 24 SyntacticMatches, 2 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 358 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=202, Invalid=1204, Unknown=0, NotChecked=0, Total=1406 [2022-11-22 00:29:41,702 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 157 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 146 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 157 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 158 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 146 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 00:29:41,702 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [157 Valid, 29 Invalid, 158 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 146 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 00:29:41,703 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2022-11-22 00:29:41,703 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 29. [2022-11-22 00:29:41,704 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 25 states have (on average 1.24) internal successors, (31), 28 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:29:41,704 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 31 transitions. [2022-11-22 00:29:41,704 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 31 transitions. Word has length 17 [2022-11-22 00:29:41,704 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 00:29:41,704 INFO L495 AbstractCegarLoop]: Abstraction has 29 states and 31 transitions. [2022-11-22 00:29:41,704 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 17 states have (on average 2.411764705882353) internal successors, (41), 17 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:29:41,704 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 31 transitions. [2022-11-22 00:29:41,705 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2022-11-22 00:29:41,705 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:29:41,705 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 00:29:41,715 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-22 00:29:41,905 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:29:41,906 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-22 00:29:41,906 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:29:41,906 INFO L85 PathProgramCache]: Analyzing trace with hash 1507494413, now seen corresponding path program 1 times [2022-11-22 00:29:41,906 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:29:41,906 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1356412560] [2022-11-22 00:29:41,906 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:29:41,907 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:29:41,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:29:42,378 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-22 00:29:42,379 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:29:42,379 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1356412560] [2022-11-22 00:29:42,379 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1356412560] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 00:29:42,379 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [389409097] [2022-11-22 00:29:42,379 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:29:42,379 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:29:42,379 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 [2022-11-22 00:29:42,383 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 00:29:42,419 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-22 00:29:42,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:29:42,509 INFO L263 TraceCheckSpWp]: Trace formula consists of 176 conjuncts, 24 conjunts are in the unsatisfiable core [2022-11-22 00:29:42,511 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 00:29:42,619 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-22 00:29:42,620 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 00:29:42,788 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2022-11-22 00:29:42,820 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-22 00:29:42,820 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [389409097] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 00:29:42,821 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1699310384] [2022-11-22 00:29:42,823 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-11-22 00:29:42,823 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 00:29:42,823 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 00:29:42,823 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 00:29:42,824 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 00:29:42,856 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 00:29:42,857 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-22 00:29:42,907 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-22 00:29:42,961 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:29:43,004 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:29:43,052 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-22 00:29:43,126 INFO L321 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-11-22 00:29:43,127 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 84 treesize of output 83 [2022-11-22 00:29:43,190 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:29:43,216 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:29:43,284 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-22 00:29:43,284 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-22 00:29:44,224 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 00:29:47,490 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2071#(and (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc14#1.base|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_#t~nondet19#1| 2147483647) (<= 0 |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#t~post3#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_cstrncmp_~s2#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrncmp_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cstrncmp_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#in~s1#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrncmp_~s1#1.base|) (<= 0 (+ 2147483648 |ULTIMATE.start_main_#t~nondet19#1|)) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (< (select |#length| |ULTIMATE.start_cstrncmp_#t~post3#1.base|) (+ 1 |ULTIMATE.start_cstrncmp_#t~post3#1.offset|)) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrncmp_#in~n#1| 2147483647) (= |#NULL.offset| 0) (<= 0 (+ |ULTIMATE.start_cstrncmp_#in~n#1| 2147483648)) (<= 0 |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrncmp_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_cstrncmp_~s1#1.offset|) (= |ULTIMATE.start_main_#t~malloc14#1.offset| 0) (<= |ULTIMATE.start_cstrncmp_#in~s1#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrncmp_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-22 00:29:47,490 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 00:29:47,490 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 00:29:47,490 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 7] total 17 [2022-11-22 00:29:47,490 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1712761802] [2022-11-22 00:29:47,490 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 00:29:47,491 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-11-22 00:29:47,491 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 00:29:47,491 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-11-22 00:29:47,492 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=863, Unknown=0, NotChecked=0, Total=992 [2022-11-22 00:29:47,492 INFO L87 Difference]: Start difference. First operand 29 states and 31 transitions. Second operand has 18 states, 17 states have (on average 2.3529411764705883) internal successors, (40), 18 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:29:47,818 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 00:29:47,819 INFO L93 Difference]: Finished difference Result 32 states and 35 transitions. [2022-11-22 00:29:47,819 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-11-22 00:29:47,819 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 2.3529411764705883) internal successors, (40), 18 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2022-11-22 00:29:47,819 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 00:29:47,820 INFO L225 Difference]: With dead ends: 32 [2022-11-22 00:29:47,820 INFO L226 Difference]: Without dead ends: 32 [2022-11-22 00:29:47,821 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 28 SyntacticMatches, 2 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 403 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=191, Invalid=1215, Unknown=0, NotChecked=0, Total=1406 [2022-11-22 00:29:47,821 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 120 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 179 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 120 SdHoareTripleChecker+Valid, 42 SdHoareTripleChecker+Invalid, 187 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 179 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 00:29:47,822 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [120 Valid, 42 Invalid, 187 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 179 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 00:29:47,822 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2022-11-22 00:29:47,823 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2022-11-22 00:29:47,823 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 26 states have (on average 1.2307692307692308) internal successors, (32), 29 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:29:47,824 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2022-11-22 00:29:47,824 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 18 [2022-11-22 00:29:47,824 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 00:29:47,824 INFO L495 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2022-11-22 00:29:47,824 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 17 states have (on average 2.3529411764705883) internal successors, (40), 18 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:29:47,824 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2022-11-22 00:29:47,825 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-11-22 00:29:47,825 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:29:47,825 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 00:29:47,833 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-22 00:29:48,030 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:29:48,031 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr17REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-22 00:29:48,031 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:29:48,031 INFO L85 PathProgramCache]: Analyzing trace with hash 1298152942, now seen corresponding path program 1 times [2022-11-22 00:29:48,031 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:29:48,031 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [204754830] [2022-11-22 00:29:48,031 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:29:48,031 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:29:48,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:29:48,311 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-22 00:29:48,312 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:29:48,312 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [204754830] [2022-11-22 00:29:48,312 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [204754830] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 00:29:48,312 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1370304476] [2022-11-22 00:29:48,312 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:29:48,313 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:29:48,313 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 [2022-11-22 00:29:48,314 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 00:29:48,319 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-22 00:29:48,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:29:48,421 INFO L263 TraceCheckSpWp]: Trace formula consists of 192 conjuncts, 24 conjunts are in the unsatisfiable core [2022-11-22 00:29:48,422 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 00:29:48,551 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-22 00:29:48,551 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 00:29:48,754 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2022-11-22 00:29:48,793 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-22 00:29:48,794 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1370304476] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 00:29:48,794 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [362533088] [2022-11-22 00:29:48,796 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-11-22 00:29:48,796 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 00:29:48,797 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 00:29:48,797 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 00:29:48,797 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 00:29:48,828 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 00:29:48,830 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-22 00:29:48,881 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:29:48,964 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:29:48,991 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:29:49,062 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-22 00:29:49,103 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:29:49,131 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:29:49,184 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-22 00:29:49,184 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-22 00:29:50,139 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 00:29:53,612 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2293#(and (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc14#1.base|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (exists ((|v_ULTIMATE.start_cstrncmp_#t~post3#1.base_40| Int)) (and (<= 1 (select |#length| |v_ULTIMATE.start_cstrncmp_#t~post3#1.base_40|)) (= (select |#valid| |v_ULTIMATE.start_cstrncmp_#t~post3#1.base_40|) 1) (<= 0 |v_ULTIMATE.start_cstrncmp_#t~post3#1.base_40|))) (= (+ |ULTIMATE.start_cstrncmp_#t~post9#1.offset| 1) |ULTIMATE.start_cstrncmp_~s1#1.offset|) (<= |ULTIMATE.start_main_#t~nondet19#1| 2147483647) (<= 0 |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#t~post9#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (< (select |#length| |ULTIMATE.start_cstrncmp_#t~post9#1.base|) (+ |ULTIMATE.start_cstrncmp_#t~post9#1.offset| 1)) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_cstrncmp_~s2#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrncmp_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cstrncmp_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#in~s1#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 (+ 2147483648 |ULTIMATE.start_main_#t~nondet19#1|)) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrncmp_#t~post9#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrncmp_#in~n#1| 2147483647) (= |#NULL.offset| 0) (<= 0 (+ |ULTIMATE.start_cstrncmp_#in~n#1| 2147483648)) (<= 0 |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (= |ULTIMATE.start_main_#t~malloc14#1.offset| 0) (= |ULTIMATE.start_cstrncmp_#t~post9#1.base| |ULTIMATE.start_cstrncmp_~s1#1.base|) (<= |ULTIMATE.start_cstrncmp_#in~s1#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrncmp_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-22 00:29:53,612 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 00:29:53,612 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 00:29:53,612 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 7] total 18 [2022-11-22 00:29:53,612 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [412811925] [2022-11-22 00:29:53,612 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 00:29:53,613 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-11-22 00:29:53,613 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 00:29:53,614 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-11-22 00:29:53,614 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=988, Unknown=0, NotChecked=0, Total=1122 [2022-11-22 00:29:53,615 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand has 20 states, 19 states have (on average 2.473684210526316) internal successors, (47), 19 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:29:53,934 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 00:29:53,935 INFO L93 Difference]: Finished difference Result 36 states and 38 transitions. [2022-11-22 00:29:53,937 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-11-22 00:29:53,938 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 19 states have (on average 2.473684210526316) internal successors, (47), 19 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2022-11-22 00:29:53,938 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 00:29:53,938 INFO L225 Difference]: With dead ends: 36 [2022-11-22 00:29:53,938 INFO L226 Difference]: Without dead ends: 36 [2022-11-22 00:29:53,939 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 32 SyntacticMatches, 2 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 420 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=234, Invalid=1488, Unknown=0, NotChecked=0, Total=1722 [2022-11-22 00:29:53,940 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 169 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 146 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 169 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 154 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 146 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 00:29:53,940 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [169 Valid, 29 Invalid, 154 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 146 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 00:29:53,941 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2022-11-22 00:29:53,941 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 29. [2022-11-22 00:29:53,942 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 26 states have (on average 1.1923076923076923) internal successors, (31), 28 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:29:53,942 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 31 transitions. [2022-11-22 00:29:53,942 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 31 transitions. Word has length 20 [2022-11-22 00:29:53,942 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 00:29:53,943 INFO L495 AbstractCegarLoop]: Abstraction has 29 states and 31 transitions. [2022-11-22 00:29:53,943 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 19 states have (on average 2.473684210526316) internal successors, (47), 19 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:29:53,943 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 31 transitions. [2022-11-22 00:29:53,943 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-11-22 00:29:53,944 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:29:53,944 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 00:29:53,955 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-22 00:29:54,149 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:29:54,149 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-22 00:29:54,150 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:29:54,150 INFO L85 PathProgramCache]: Analyzing trace with hash 1588026847, now seen corresponding path program 1 times [2022-11-22 00:29:54,150 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:29:54,150 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1585629064] [2022-11-22 00:29:54,150 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:29:54,150 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:29:54,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:29:54,512 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-22 00:29:54,512 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:29:54,512 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1585629064] [2022-11-22 00:29:54,512 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1585629064] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 00:29:54,512 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1233789385] [2022-11-22 00:29:54,513 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:29:54,513 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:29:54,513 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 [2022-11-22 00:29:54,514 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 00:29:54,518 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-22 00:29:54,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:29:54,616 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 32 conjunts are in the unsatisfiable core [2022-11-22 00:29:54,618 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 00:29:54,742 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-22 00:29:54,743 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 00:29:54,933 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2022-11-22 00:29:54,966 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-22 00:29:54,966 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1233789385] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 00:29:54,966 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1336257008] [2022-11-22 00:29:54,968 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-22 00:29:54,968 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 00:29:54,969 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 00:29:54,969 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 00:29:54,969 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 00:29:55,007 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 00:29:55,008 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-22 00:29:55,057 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-22 00:29:55,107 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:29:55,155 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:29:55,207 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:29:55,254 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 85 treesize of output 77 [2022-11-22 00:29:55,312 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:29:55,347 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:29:55,447 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-22 00:29:55,448 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-22 00:29:56,014 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 00:29:59,467 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2528#(and (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc14#1.base|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (= (select |#valid| |ULTIMATE.start_cstrncmp_~s1#1.base|) 1) (<= |ULTIMATE.start_main_#t~nondet19#1| 2147483647) (<= 0 |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (= |ULTIMATE.start_cstrncmp_#t~mem7#1| (select (select |#memory_int| |ULTIMATE.start_cstrncmp_~s1#1.base|) |ULTIMATE.start_cstrncmp_~s1#1.offset|)) (< (select |#length| |ULTIMATE.start_cstrncmp_#t~pre6#1.base|) (+ |ULTIMATE.start_cstrncmp_#t~pre6#1.offset| 1)) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrncmp_~n#1| 2147483647) (<= (+ |ULTIMATE.start_cstrncmp_~s1#1.offset| 1) (select |#length| |ULTIMATE.start_cstrncmp_~s1#1.base|)) (<= 0 |ULTIMATE.start_cstrncmp_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#t~pre6#1.offset|) (<= 0 |ULTIMATE.start_cstrncmp_#in~s1#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrncmp_~s1#1.base|) (<= 0 (+ 2147483648 |ULTIMATE.start_main_#t~nondet19#1|)) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (= |ULTIMATE.start_cstrncmp_~s2#1.offset| |ULTIMATE.start_cstrncmp_#t~pre6#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrncmp_#in~n#1| 2147483647) (= |ULTIMATE.start_cstrncmp_~s2#1.base| |ULTIMATE.start_cstrncmp_#t~pre6#1.base|) (= |#NULL.offset| 0) (<= 0 (+ |ULTIMATE.start_cstrncmp_#in~n#1| 2147483648)) (<= 0 |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrncmp_~s1#1.offset|) (= |ULTIMATE.start_main_#t~malloc14#1.offset| 0) (<= |ULTIMATE.start_cstrncmp_#in~s1#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrncmp_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-22 00:29:59,467 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 00:29:59,467 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 00:29:59,467 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 19 [2022-11-22 00:29:59,467 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [918665588] [2022-11-22 00:29:59,467 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 00:29:59,468 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-11-22 00:29:59,468 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 00:29:59,468 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-11-22 00:29:59,469 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=175, Invalid=1085, Unknown=0, NotChecked=0, Total=1260 [2022-11-22 00:29:59,469 INFO L87 Difference]: Start difference. First operand 29 states and 31 transitions. Second operand has 20 states, 19 states have (on average 2.4210526315789473) internal successors, (46), 20 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:29:59,776 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 00:29:59,776 INFO L93 Difference]: Finished difference Result 38 states and 40 transitions. [2022-11-22 00:29:59,777 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-11-22 00:29:59,777 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 19 states have (on average 2.4210526315789473) internal successors, (46), 20 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2022-11-22 00:29:59,777 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 00:29:59,777 INFO L225 Difference]: With dead ends: 38 [2022-11-22 00:29:59,778 INFO L226 Difference]: Without dead ends: 36 [2022-11-22 00:29:59,778 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 34 SyntacticMatches, 2 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 458 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=243, Invalid=1479, Unknown=0, NotChecked=0, Total=1722 [2022-11-22 00:29:59,779 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 117 mSDsluCounter, 69 mSDsCounter, 0 mSdLazyCounter, 229 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 117 SdHoareTripleChecker+Valid, 79 SdHoareTripleChecker+Invalid, 238 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 229 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 00:29:59,779 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [117 Valid, 79 Invalid, 238 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 229 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 00:29:59,779 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2022-11-22 00:29:59,780 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 30. [2022-11-22 00:29:59,780 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 27 states have (on average 1.1851851851851851) internal successors, (32), 29 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:29:59,781 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2022-11-22 00:29:59,781 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 21 [2022-11-22 00:29:59,781 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 00:29:59,781 INFO L495 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2022-11-22 00:29:59,781 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 19 states have (on average 2.4210526315789473) internal successors, (46), 20 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:29:59,781 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2022-11-22 00:29:59,782 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-11-22 00:29:59,782 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:29:59,782 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 00:29:59,795 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-22 00:29:59,988 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2022-11-22 00:29:59,988 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-22 00:29:59,988 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:29:59,989 INFO L85 PathProgramCache]: Analyzing trace with hash 1388819883, now seen corresponding path program 2 times [2022-11-22 00:29:59,989 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:29:59,989 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1954336504] [2022-11-22 00:29:59,989 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:29:59,989 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:30:00,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:30:00,587 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-22 00:30:00,587 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:30:00,588 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1954336504] [2022-11-22 00:30:00,588 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1954336504] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 00:30:00,588 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [650200055] [2022-11-22 00:30:00,588 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 00:30:00,588 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:30:00,589 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 [2022-11-22 00:30:00,590 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 00:30:00,619 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-22 00:30:00,735 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-22 00:30:00,735 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 00:30:00,737 INFO L263 TraceCheckSpWp]: Trace formula consists of 204 conjuncts, 64 conjunts are in the unsatisfiable core [2022-11-22 00:30:00,741 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 00:30:00,764 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-22 00:30:00,764 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2022-11-22 00:30:01,005 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-22 00:30:01,560 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-22 00:30:01,801 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 00:30:01,802 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 00:30:01,812 INFO L321 Elim1Store]: treesize reduction 17, result has 15.0 percent of original size [2022-11-22 00:30:01,817 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 31 treesize of output 13 [2022-11-22 00:30:01,824 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-22 00:30:01,824 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 00:30:02,377 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-22 00:30:02,378 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 95 treesize of output 95 [2022-11-22 00:30:02,412 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 36 treesize of output 34 [2022-11-22 00:30:02,436 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-22 00:30:02,436 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 55 treesize of output 51 [2022-11-22 00:30:02,937 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-22 00:30:02,938 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [650200055] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 00:30:02,938 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [143148670] [2022-11-22 00:30:02,942 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-11-22 00:30:02,942 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 00:30:02,942 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 00:30:02,942 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 00:30:02,943 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 00:30:02,977 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 00:30:02,979 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-22 00:30:03,028 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-22 00:30:03,090 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:30:03,136 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:30:03,184 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-22 00:30:03,254 INFO L321 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-11-22 00:30:03,255 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 84 treesize of output 83 [2022-11-22 00:30:03,314 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:30:03,339 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:30:03,398 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-22 00:30:03,399 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-22 00:30:04,428 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 00:30:08,596 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2791#(and (<= |ULTIMATE.start_cstrncmp_~s1#1.offset| (select |#length| |ULTIMATE.start_cstrncmp_~s1#1.base|)) (<= 1 |ULTIMATE.start_cstrncmp_~s1#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc14#1.base|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (= (select |#valid| |ULTIMATE.start_cstrncmp_~s1#1.base|) 1) (<= |ULTIMATE.start_cstrncmp_~n#1| 2147483646) (<= |ULTIMATE.start_main_#t~nondet19#1| 2147483647) (<= 0 |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (not (= (mod |ULTIMATE.start_cstrncmp_~n#1| 4294967296) 0)) (not (= (select (select |#memory_int| |ULTIMATE.start_cstrncmp_~s1#1.base|) (+ (- 1) |ULTIMATE.start_cstrncmp_~s1#1.offset|)) 0)) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_cstrncmp_~s2#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_cstrncmp_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#in~s1#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrncmp_~s1#1.base|) (<= 0 (+ 2147483648 |ULTIMATE.start_main_#t~nondet19#1|)) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrncmp_#in~n#1| 2147483647) (not (<= (+ |ULTIMATE.start_cstrncmp_~s1#1.offset| 1) (select |#length| |ULTIMATE.start_cstrncmp_~s1#1.base|))) (= |#NULL.offset| 0) (<= 0 (+ |ULTIMATE.start_cstrncmp_#in~n#1| 2147483648)) (<= 0 |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (= |ULTIMATE.start_main_#t~malloc14#1.offset| 0) (<= |ULTIMATE.start_cstrncmp_#in~s1#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrncmp_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-22 00:30:08,596 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 00:30:08,596 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 00:30:08,596 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 14, 14] total 34 [2022-11-22 00:30:08,597 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1245904224] [2022-11-22 00:30:08,597 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 00:30:08,597 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-11-22 00:30:08,597 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 00:30:08,598 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-11-22 00:30:08,599 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=187, Invalid=2165, Unknown=0, NotChecked=0, Total=2352 [2022-11-22 00:30:08,599 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand has 35 states, 35 states have (on average 1.7714285714285714) internal successors, (62), 34 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:30:12,091 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 00:30:12,091 INFO L93 Difference]: Finished difference Result 84 states and 87 transitions. [2022-11-22 00:30:12,092 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2022-11-22 00:30:12,092 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.7714285714285714) internal successors, (62), 34 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 23 [2022-11-22 00:30:12,092 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 00:30:12,093 INFO L225 Difference]: With dead ends: 84 [2022-11-22 00:30:12,093 INFO L226 Difference]: Without dead ends: 36 [2022-11-22 00:30:12,095 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1843 ImplicationChecksByTransitivity, 8.4s TimeCoverageRelationStatistics Valid=1014, Invalid=6296, Unknown=0, NotChecked=0, Total=7310 [2022-11-22 00:30:12,096 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 329 mSDsluCounter, 53 mSDsCounter, 0 mSdLazyCounter, 453 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 329 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 494 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 453 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-22 00:30:12,096 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [329 Valid, 56 Invalid, 494 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 453 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-22 00:30:12,097 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2022-11-22 00:30:12,098 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 34. [2022-11-22 00:30:12,098 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 31 states have (on average 1.1612903225806452) internal successors, (36), 33 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:30:12,098 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 36 transitions. [2022-11-22 00:30:12,099 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 36 transitions. Word has length 23 [2022-11-22 00:30:12,099 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 00:30:12,099 INFO L495 AbstractCegarLoop]: Abstraction has 34 states and 36 transitions. [2022-11-22 00:30:12,099 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.7714285714285714) internal successors, (62), 34 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:30:12,099 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 36 transitions. [2022-11-22 00:30:12,100 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-11-22 00:30:12,100 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:30:12,100 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 00:30:12,107 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-22 00:30:12,306 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2022-11-22 00:30:12,306 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-22 00:30:12,307 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:30:12,307 INFO L85 PathProgramCache]: Analyzing trace with hash -518651425, now seen corresponding path program 3 times [2022-11-22 00:30:12,307 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:30:12,307 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [962879359] [2022-11-22 00:30:12,307 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:30:12,307 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:30:12,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:30:12,671 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-22 00:30:12,671 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:30:12,672 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [962879359] [2022-11-22 00:30:12,672 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [962879359] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 00:30:12,672 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [558477274] [2022-11-22 00:30:12,672 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 00:30:12,672 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:30:12,672 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 [2022-11-22 00:30:12,674 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 00:30:12,699 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-22 00:30:12,822 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 00:30:12,822 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 00:30:12,824 INFO L263 TraceCheckSpWp]: Trace formula consists of 230 conjuncts, 29 conjunts are in the unsatisfiable core [2022-11-22 00:30:12,826 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 00:30:12,994 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 1 proven. 11 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-22 00:30:12,995 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 00:30:13,199 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2022-11-22 00:30:13,264 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 1 proven. 11 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-22 00:30:13,264 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [558477274] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 00:30:13,264 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [685750883] [2022-11-22 00:30:13,266 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-11-22 00:30:13,266 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 00:30:13,267 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 00:30:13,267 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 00:30:13,267 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 00:30:13,298 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 00:30:13,299 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-22 00:30:13,349 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-22 00:30:13,408 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:30:13,460 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:30:13,512 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:30:13,573 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 85 treesize of output 77 [2022-11-22 00:30:13,629 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:30:13,662 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:30:13,721 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-22 00:30:13,721 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-22 00:30:14,156 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 00:30:17,308 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3174#(and (< (select |#length| |ULTIMATE.start_cstrncmp_~s1#1.base|) (+ |ULTIMATE.start_cstrncmp_~s1#1.offset| 1)) (<= 0 |ULTIMATE.start_main_#t~malloc14#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc14#1.base|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_#t~nondet19#1| 2147483647) (<= 0 |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.offset|) (<= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrncmp_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cstrncmp_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#in~s1#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrncmp_~s1#1.base|) (<= 0 (+ 2147483648 |ULTIMATE.start_main_#t~nondet19#1|)) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrncmp_#in~n#1| 2147483647) (<= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= 0 (+ |ULTIMATE.start_cstrncmp_#in~n#1| 2147483648)) (<= 0 |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (<= 0 |#NULL.offset|) (<= 0 |ULTIMATE.start_cstrncmp_~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrncmp_~s2#1.offset|) (<= |ULTIMATE.start_main_#t~malloc14#1.offset| 0) (<= |ULTIMATE.start_cstrncmp_#in~s1#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrncmp_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-22 00:30:17,309 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 00:30:17,309 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 00:30:17,309 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 19 [2022-11-22 00:30:17,309 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1419553251] [2022-11-22 00:30:17,309 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 00:30:17,309 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-11-22 00:30:17,309 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 00:30:17,310 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-11-22 00:30:17,310 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=142, Invalid=1048, Unknown=0, NotChecked=0, Total=1190 [2022-11-22 00:30:17,311 INFO L87 Difference]: Start difference. First operand 34 states and 36 transitions. Second operand has 21 states, 20 states have (on average 2.85) internal successors, (57), 20 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:30:17,627 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 00:30:17,627 INFO L93 Difference]: Finished difference Result 44 states and 46 transitions. [2022-11-22 00:30:17,627 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-11-22 00:30:17,628 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 2.85) internal successors, (57), 20 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 27 [2022-11-22 00:30:17,628 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 00:30:17,628 INFO L225 Difference]: With dead ends: 44 [2022-11-22 00:30:17,628 INFO L226 Difference]: Without dead ends: 44 [2022-11-22 00:30:17,629 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 51 SyntacticMatches, 3 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 381 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=244, Invalid=1478, Unknown=0, NotChecked=0, Total=1722 [2022-11-22 00:30:17,629 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 230 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 196 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 230 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 205 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 196 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 00:30:17,629 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [230 Valid, 33 Invalid, 205 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 196 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 00:30:17,630 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2022-11-22 00:30:17,631 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 38. [2022-11-22 00:30:17,631 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 35 states have (on average 1.1428571428571428) internal successors, (40), 37 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:30:17,631 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2022-11-22 00:30:17,632 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 27 [2022-11-22 00:30:17,632 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 00:30:17,632 INFO L495 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2022-11-22 00:30:17,632 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 20 states have (on average 2.85) internal successors, (57), 20 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:30:17,632 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2022-11-22 00:30:17,633 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-11-22 00:30:17,633 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:30:17,633 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 00:30:17,639 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2022-11-22 00:30:17,838 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:30:17,839 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-22 00:30:17,839 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:30:17,839 INFO L85 PathProgramCache]: Analyzing trace with hash 1101676724, now seen corresponding path program 2 times [2022-11-22 00:30:17,839 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:30:17,839 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2141137180] [2022-11-22 00:30:17,839 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:30:17,839 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:30:17,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:30:18,260 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-22 00:30:18,260 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:30:18,260 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2141137180] [2022-11-22 00:30:18,261 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2141137180] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 00:30:18,261 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1796523798] [2022-11-22 00:30:18,261 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 00:30:18,261 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:30:18,261 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 [2022-11-22 00:30:18,263 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 00:30:18,311 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-22 00:30:18,646 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-22 00:30:18,646 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 00:30:18,648 INFO L263 TraceCheckSpWp]: Trace formula consists of 244 conjuncts, 33 conjunts are in the unsatisfiable core [2022-11-22 00:30:18,650 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 00:30:18,796 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 1 proven. 13 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-22 00:30:18,796 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 00:30:18,987 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2022-11-22 00:30:19,034 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 1 proven. 13 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-22 00:30:19,035 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1796523798] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 00:30:19,035 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1547567943] [2022-11-22 00:30:19,036 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-11-22 00:30:19,036 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 00:30:19,037 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 00:30:19,037 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 00:30:19,037 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 00:30:19,067 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 00:30:19,071 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-22 00:30:19,102 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:30:19,147 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:30:19,169 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:30:19,221 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:30:19,251 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:30:19,271 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:30:19,311 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-22 00:30:19,311 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-22 00:30:20,073 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 00:30:23,245 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3467#(and (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc14#1.base|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_#t~nondet19#1| 2147483647) (<= 0 |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#t~post3#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_cstrncmp_~s2#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrncmp_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cstrncmp_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#in~s1#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrncmp_~s1#1.base|) (<= 0 (+ 2147483648 |ULTIMATE.start_main_#t~nondet19#1|)) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (< (select |#length| |ULTIMATE.start_cstrncmp_#t~post3#1.base|) (+ 1 |ULTIMATE.start_cstrncmp_#t~post3#1.offset|)) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrncmp_#in~n#1| 2147483647) (= |#NULL.offset| 0) (<= 0 (+ |ULTIMATE.start_cstrncmp_#in~n#1| 2147483648)) (<= 0 |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrncmp_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_cstrncmp_~s1#1.offset|) (= |ULTIMATE.start_main_#t~malloc14#1.offset| 0) (<= |ULTIMATE.start_cstrncmp_#in~s1#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrncmp_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-22 00:30:23,245 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 00:30:23,245 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 00:30:23,245 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 20 [2022-11-22 00:30:23,245 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [937101931] [2022-11-22 00:30:23,245 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 00:30:23,246 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-11-22 00:30:23,246 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 00:30:23,246 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-11-22 00:30:23,247 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=1054, Unknown=0, NotChecked=0, Total=1190 [2022-11-22 00:30:23,247 INFO L87 Difference]: Start difference. First operand 38 states and 40 transitions. Second operand has 21 states, 20 states have (on average 2.8) internal successors, (56), 21 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:30:23,634 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 00:30:23,634 INFO L93 Difference]: Finished difference Result 40 states and 43 transitions. [2022-11-22 00:30:23,634 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-22 00:30:23,634 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 2.8) internal successors, (56), 21 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 28 [2022-11-22 00:30:23,635 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 00:30:23,635 INFO L225 Difference]: With dead ends: 40 [2022-11-22 00:30:23,635 INFO L226 Difference]: Without dead ends: 40 [2022-11-22 00:30:23,636 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 55 SyntacticMatches, 3 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 476 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=237, Invalid=1569, Unknown=0, NotChecked=0, Total=1806 [2022-11-22 00:30:23,637 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 104 mSDsluCounter, 43 mSDsCounter, 0 mSdLazyCounter, 203 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 104 SdHoareTripleChecker+Valid, 51 SdHoareTripleChecker+Invalid, 211 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 203 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 00:30:23,637 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [104 Valid, 51 Invalid, 211 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 203 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 00:30:23,637 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2022-11-22 00:30:23,638 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2022-11-22 00:30:23,638 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 36 states have (on average 1.1388888888888888) internal successors, (41), 38 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:30:23,639 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 41 transitions. [2022-11-22 00:30:23,639 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 41 transitions. Word has length 28 [2022-11-22 00:30:23,639 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 00:30:23,639 INFO L495 AbstractCegarLoop]: Abstraction has 39 states and 41 transitions. [2022-11-22 00:30:23,640 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 20 states have (on average 2.8) internal successors, (56), 21 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:30:23,640 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 41 transitions. [2022-11-22 00:30:23,640 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-11-22 00:30:23,640 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:30:23,640 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 00:30:23,647 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-22 00:30:23,846 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2022-11-22 00:30:23,846 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-22 00:30:23,846 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:30:23,846 INFO L85 PathProgramCache]: Analyzing trace with hash -2088775208, now seen corresponding path program 2 times [2022-11-22 00:30:23,847 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:30:23,847 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1918069684] [2022-11-22 00:30:23,847 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:30:23,847 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:30:23,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:30:24,263 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-22 00:30:24,263 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:30:24,263 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1918069684] [2022-11-22 00:30:24,263 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1918069684] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 00:30:24,264 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1018428132] [2022-11-22 00:30:24,264 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 00:30:24,264 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:30:24,264 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 [2022-11-22 00:30:24,267 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 00:30:24,271 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-22 00:30:24,370 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 1 check-sat command(s) [2022-11-22 00:30:24,370 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 00:30:24,371 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 13 conjunts are in the unsatisfiable core [2022-11-22 00:30:24,373 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 00:30:24,437 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-11-22 00:30:24,438 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-22 00:30:24,438 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1018428132] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 00:30:24,438 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-22 00:30:24,438 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [10] total 14 [2022-11-22 00:30:24,438 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [240881794] [2022-11-22 00:30:24,438 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 00:30:24,439 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-22 00:30:24,439 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 00:30:24,439 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-22 00:30:24,440 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=174, Unknown=0, NotChecked=0, Total=210 [2022-11-22 00:30:24,440 INFO L87 Difference]: Start difference. First operand 39 states and 41 transitions. Second operand has 5 states, 4 states have (on average 5.25) internal successors, (21), 5 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:30:24,496 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 00:30:24,496 INFO L93 Difference]: Finished difference Result 38 states and 40 transitions. [2022-11-22 00:30:24,496 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-22 00:30:24,497 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 5.25) internal successors, (21), 5 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 31 [2022-11-22 00:30:24,497 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 00:30:24,497 INFO L225 Difference]: With dead ends: 38 [2022-11-22 00:30:24,497 INFO L226 Difference]: Without dead ends: 36 [2022-11-22 00:30:24,498 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=40, Invalid=200, Unknown=0, NotChecked=0, Total=240 [2022-11-22 00:30:24,498 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 7 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 51 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-22 00:30:24,498 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 21 Invalid, 51 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-22 00:30:24,499 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2022-11-22 00:30:24,500 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2022-11-22 00:30:24,500 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 34 states have (on average 1.1176470588235294) internal successors, (38), 35 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:30:24,500 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2022-11-22 00:30:24,500 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 31 [2022-11-22 00:30:24,501 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 00:30:24,501 INFO L495 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2022-11-22 00:30:24,501 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 5.25) internal successors, (21), 5 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:30:24,501 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2022-11-22 00:30:24,501 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2022-11-22 00:30:24,502 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:30:24,502 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 00:30:24,511 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-11-22 00:30:24,707 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2022-11-22 00:30:24,708 INFO L420 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-22 00:30:24,708 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:30:24,708 INFO L85 PathProgramCache]: Analyzing trace with hash -1554837660, now seen corresponding path program 4 times [2022-11-22 00:30:24,708 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:30:24,708 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [565810446] [2022-11-22 00:30:24,708 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:30:24,709 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:30:24,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:30:25,415 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 5 proven. 20 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-22 00:30:25,415 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:30:25,415 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [565810446] [2022-11-22 00:30:25,415 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [565810446] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 00:30:25,415 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2094128956] [2022-11-22 00:30:25,415 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 00:30:25,416 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:30:25,416 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 [2022-11-22 00:30:25,419 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 00:30:25,441 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-11-22 00:30:25,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:30:25,589 INFO L263 TraceCheckSpWp]: Trace formula consists of 272 conjuncts, 82 conjunts are in the unsatisfiable core [2022-11-22 00:30:25,593 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 00:30:25,804 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:30:26,443 INFO L321 Elim1Store]: treesize reduction 32, result has 8.6 percent of original size [2022-11-22 00:30:26,444 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 29 treesize of output 13 [2022-11-22 00:30:26,447 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 5 proven. 20 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-22 00:30:26,448 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 00:30:26,894 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-22 00:30:26,894 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 99 treesize of output 99 [2022-11-22 00:30:26,927 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 26 [2022-11-22 00:30:26,944 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-22 00:30:26,944 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 45 treesize of output 37 [2022-11-22 00:30:27,211 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 5 proven. 20 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-22 00:30:27,211 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2094128956] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 00:30:27,211 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [12581057] [2022-11-22 00:30:27,213 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-11-22 00:30:27,213 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 00:30:27,214 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 00:30:27,214 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 00:30:27,214 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 00:30:27,252 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 00:30:27,253 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-22 00:30:27,300 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-22 00:30:27,346 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:30:27,392 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:30:27,433 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-22 00:30:27,501 INFO L321 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-11-22 00:30:27,502 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 84 treesize of output 83 [2022-11-22 00:30:27,558 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:30:27,582 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:30:27,650 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-22 00:30:27,651 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-22 00:30:28,638 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 00:30:32,988 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3989#(and (<= |ULTIMATE.start_cstrncmp_~s1#1.offset| (select |#length| |ULTIMATE.start_cstrncmp_~s1#1.base|)) (<= 1 |ULTIMATE.start_cstrncmp_~s1#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc14#1.base|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (= (select |#valid| |ULTIMATE.start_cstrncmp_~s1#1.base|) 1) (<= |ULTIMATE.start_cstrncmp_~n#1| 2147483646) (<= |ULTIMATE.start_main_#t~nondet19#1| 2147483647) (<= 0 |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (not (= (mod |ULTIMATE.start_cstrncmp_~n#1| 4294967296) 0)) (not (= (select (select |#memory_int| |ULTIMATE.start_cstrncmp_~s1#1.base|) (+ (- 1) |ULTIMATE.start_cstrncmp_~s1#1.offset|)) 0)) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_cstrncmp_~s2#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_cstrncmp_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#in~s1#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrncmp_~s1#1.base|) (<= 0 (+ 2147483648 |ULTIMATE.start_main_#t~nondet19#1|)) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrncmp_#in~n#1| 2147483647) (not (<= (+ |ULTIMATE.start_cstrncmp_~s1#1.offset| 1) (select |#length| |ULTIMATE.start_cstrncmp_~s1#1.base|))) (= |#NULL.offset| 0) (<= 0 (+ |ULTIMATE.start_cstrncmp_#in~n#1| 2147483648)) (<= 0 |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (= |ULTIMATE.start_main_#t~malloc14#1.offset| 0) (<= |ULTIMATE.start_cstrncmp_#in~s1#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrncmp_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-22 00:30:32,988 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 00:30:32,988 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 00:30:32,988 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 16, 16] total 40 [2022-11-22 00:30:32,989 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [905942255] [2022-11-22 00:30:32,989 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 00:30:32,989 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2022-11-22 00:30:32,989 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 00:30:32,989 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2022-11-22 00:30:32,990 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=198, Invalid=2664, Unknown=0, NotChecked=0, Total=2862 [2022-11-22 00:30:32,991 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand has 40 states, 40 states have (on average 2.15) internal successors, (86), 40 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:30:35,391 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 00:30:35,391 INFO L93 Difference]: Finished difference Result 110 states and 113 transitions. [2022-11-22 00:30:35,391 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2022-11-22 00:30:35,391 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 2.15) internal successors, (86), 40 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 33 [2022-11-22 00:30:35,392 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 00:30:35,392 INFO L225 Difference]: With dead ends: 110 [2022-11-22 00:30:35,392 INFO L226 Difference]: Without dead ends: 42 [2022-11-22 00:30:35,395 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 58 SyntacticMatches, 0 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1824 ImplicationChecksByTransitivity, 7.4s TimeCoverageRelationStatistics Valid=784, Invalid=7772, Unknown=0, NotChecked=0, Total=8556 [2022-11-22 00:30:35,396 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 328 mSDsluCounter, 125 mSDsCounter, 0 mSdLazyCounter, 820 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 328 SdHoareTripleChecker+Valid, 130 SdHoareTripleChecker+Invalid, 852 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 820 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-22 00:30:35,396 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [328 Valid, 130 Invalid, 852 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 820 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-22 00:30:35,396 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2022-11-22 00:30:35,397 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 40. [2022-11-22 00:30:35,398 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 38 states have (on average 1.105263157894737) internal successors, (42), 39 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:30:35,398 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 42 transitions. [2022-11-22 00:30:35,398 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 42 transitions. Word has length 33 [2022-11-22 00:30:35,398 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 00:30:35,399 INFO L495 AbstractCegarLoop]: Abstraction has 40 states and 42 transitions. [2022-11-22 00:30:35,399 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 2.15) internal successors, (86), 40 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:30:35,399 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 42 transitions. [2022-11-22 00:30:35,399 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-11-22 00:30:35,399 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:30:35,400 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 00:30:35,414 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-11-22 00:30:35,606 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2022-11-22 00:30:35,606 INFO L420 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-22 00:30:35,606 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:30:35,607 INFO L85 PathProgramCache]: Analyzing trace with hash -255573736, now seen corresponding path program 5 times [2022-11-22 00:30:35,607 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:30:35,607 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2060439527] [2022-11-22 00:30:35,607 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:30:35,607 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:30:35,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:30:36,016 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 1 proven. 29 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-22 00:30:36,016 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:30:36,016 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2060439527] [2022-11-22 00:30:36,016 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2060439527] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 00:30:36,016 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [608905699] [2022-11-22 00:30:36,017 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 00:30:36,017 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:30:36,017 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 [2022-11-22 00:30:36,018 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 00:30:36,023 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-11-22 00:30:36,414 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-22 00:30:36,414 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 00:30:36,418 INFO L263 TraceCheckSpWp]: Trace formula consists of 298 conjuncts, 49 conjunts are in the unsatisfiable core [2022-11-22 00:30:36,426 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 00:30:36,456 INFO L321 Elim1Store]: treesize reduction 11, result has 50.0 percent of original size [2022-11-22 00:30:36,457 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 17 [2022-11-22 00:30:36,471 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2022-11-22 00:30:36,722 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2022-11-22 00:30:36,808 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 23 [2022-11-22 00:30:37,174 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-22 00:30:37,174 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 24 treesize of output 21 [2022-11-22 00:30:37,289 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2022-11-22 00:30:37,289 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 00:30:37,819 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-22 00:30:37,820 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 24 [2022-11-22 00:30:37,835 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-22 00:30:37,836 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 37 treesize of output 34 [2022-11-22 00:30:37,845 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-22 00:30:38,242 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2022-11-22 00:30:38,243 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [608905699] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 00:30:38,244 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1716763963] [2022-11-22 00:30:38,246 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-11-22 00:30:38,249 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 00:30:38,249 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 00:30:38,250 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 00:30:38,250 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 00:30:38,282 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 00:30:38,286 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-22 00:30:38,326 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:30:38,374 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:30:38,400 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:30:38,459 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:30:38,493 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:30:38,516 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:30:38,562 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-22 00:30:38,562 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-22 00:30:39,423 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 00:30:43,239 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4473#(and (<= |ULTIMATE.start_cstrncmp_~s1#1.offset| (select |#length| |ULTIMATE.start_cstrncmp_~s1#1.base|)) (<= 1 |ULTIMATE.start_cstrncmp_~s1#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc14#1.base|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (= (select |#valid| |ULTIMATE.start_cstrncmp_~s1#1.base|) 1) (<= |ULTIMATE.start_cstrncmp_~n#1| 2147483646) (<= |ULTIMATE.start_main_#t~nondet19#1| 2147483647) (<= 0 |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (not (= (mod |ULTIMATE.start_cstrncmp_~n#1| 4294967296) 0)) (not (= (select (select |#memory_int| |ULTIMATE.start_cstrncmp_~s1#1.base|) (+ (- 1) |ULTIMATE.start_cstrncmp_~s1#1.offset|)) 0)) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_cstrncmp_~s2#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_cstrncmp_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#in~s1#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrncmp_~s1#1.base|) (<= 0 (+ 2147483648 |ULTIMATE.start_main_#t~nondet19#1|)) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrncmp_#in~n#1| 2147483647) (not (<= (+ |ULTIMATE.start_cstrncmp_~s1#1.offset| 1) (select |#length| |ULTIMATE.start_cstrncmp_~s1#1.base|))) (= |#NULL.offset| 0) (<= 0 (+ |ULTIMATE.start_cstrncmp_#in~n#1| 2147483648)) (<= 0 |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (= |ULTIMATE.start_main_#t~malloc14#1.offset| 0) (<= |ULTIMATE.start_cstrncmp_#in~s1#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrncmp_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-22 00:30:43,239 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 00:30:43,239 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 00:30:43,240 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 7, 7] total 24 [2022-11-22 00:30:43,240 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1562096702] [2022-11-22 00:30:43,240 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 00:30:43,240 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-11-22 00:30:43,240 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 00:30:43,241 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-11-22 00:30:43,241 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=1417, Unknown=0, NotChecked=0, Total=1560 [2022-11-22 00:30:43,241 INFO L87 Difference]: Start difference. First operand 40 states and 42 transitions. Second operand has 26 states, 25 states have (on average 3.08) internal successors, (77), 25 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:30:44,832 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 00:30:44,833 INFO L93 Difference]: Finished difference Result 47 states and 49 transitions. [2022-11-22 00:30:44,833 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-11-22 00:30:44,834 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 3.08) internal successors, (77), 25 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 37 [2022-11-22 00:30:44,834 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 00:30:44,834 INFO L225 Difference]: With dead ends: 47 [2022-11-22 00:30:44,834 INFO L226 Difference]: Without dead ends: 47 [2022-11-22 00:30:44,836 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 81 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 546 ImplicationChecksByTransitivity, 5.9s TimeCoverageRelationStatistics Valid=450, Invalid=2630, Unknown=0, NotChecked=0, Total=3080 [2022-11-22 00:30:44,836 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 284 mSDsluCounter, 33 mSDsCounter, 0 mSdLazyCounter, 264 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 284 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 287 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 264 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-22 00:30:44,837 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [284 Valid, 38 Invalid, 287 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 264 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-22 00:30:44,837 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2022-11-22 00:30:44,838 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 39. [2022-11-22 00:30:44,838 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 38 states have (on average 1.0789473684210527) internal successors, (41), 38 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:30:44,839 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 41 transitions. [2022-11-22 00:30:44,839 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 41 transitions. Word has length 37 [2022-11-22 00:30:44,839 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 00:30:44,839 INFO L495 AbstractCegarLoop]: Abstraction has 39 states and 41 transitions. [2022-11-22 00:30:44,839 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 25 states have (on average 3.08) internal successors, (77), 25 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:30:44,840 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 41 transitions. [2022-11-22 00:30:44,840 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2022-11-22 00:30:44,840 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:30:44,840 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 00:30:44,846 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2022-11-22 00:30:45,046 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2022-11-22 00:30:45,046 INFO L420 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-22 00:30:45,047 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:30:45,047 INFO L85 PathProgramCache]: Analyzing trace with hash 667150491, now seen corresponding path program 3 times [2022-11-22 00:30:45,047 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:30:45,047 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2125304279] [2022-11-22 00:30:45,047 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:30:45,047 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:30:45,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:30:45,566 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 1 proven. 32 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-22 00:30:45,566 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:30:45,567 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2125304279] [2022-11-22 00:30:45,567 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2125304279] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 00:30:45,567 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2045314849] [2022-11-22 00:30:45,567 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 00:30:45,567 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:30:45,567 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 [2022-11-22 00:30:45,571 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 00:30:45,599 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-11-22 00:30:45,738 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 00:30:45,738 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 00:30:45,741 INFO L263 TraceCheckSpWp]: Trace formula consists of 312 conjuncts, 43 conjunts are in the unsatisfiable core [2022-11-22 00:30:45,743 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 00:30:45,756 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-22 00:30:45,757 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2022-11-22 00:30:45,966 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 4 proven. 29 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-22 00:30:45,966 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 00:30:46,314 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 4 proven. 29 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-22 00:30:46,314 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2045314849] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 00:30:46,314 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1468203348] [2022-11-22 00:30:46,316 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-11-22 00:30:46,316 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 00:30:46,316 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 00:30:46,316 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 00:30:46,316 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 00:30:46,347 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 00:30:46,349 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-22 00:30:46,381 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-22 00:30:46,424 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:30:46,462 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:30:46,501 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:30:46,549 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 85 treesize of output 77 [2022-11-22 00:30:46,594 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:30:46,626 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:30:46,685 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-22 00:30:46,685 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-22 00:30:47,102 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 00:30:50,368 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4856#(and (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc14#1.base|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_#t~nondet19#1| 2147483647) (<= 0 |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#t~post3#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_cstrncmp_~s2#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrncmp_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cstrncmp_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#in~s1#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrncmp_~s1#1.base|) (<= 0 (+ 2147483648 |ULTIMATE.start_main_#t~nondet19#1|)) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (< (select |#length| |ULTIMATE.start_cstrncmp_#t~post3#1.base|) (+ 1 |ULTIMATE.start_cstrncmp_#t~post3#1.offset|)) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrncmp_#in~n#1| 2147483647) (= |#NULL.offset| 0) (<= 0 (+ |ULTIMATE.start_cstrncmp_#in~n#1| 2147483648)) (<= 0 |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrncmp_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_cstrncmp_~s1#1.offset|) (= |ULTIMATE.start_main_#t~malloc14#1.offset| 0) (<= |ULTIMATE.start_cstrncmp_#in~s1#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrncmp_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-22 00:30:50,368 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 00:30:50,368 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 00:30:50,368 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 28 [2022-11-22 00:30:50,368 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [800317533] [2022-11-22 00:30:50,369 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 00:30:50,369 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-11-22 00:30:50,369 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 00:30:50,370 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-11-22 00:30:50,370 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=214, Invalid=1592, Unknown=0, NotChecked=0, Total=1806 [2022-11-22 00:30:50,371 INFO L87 Difference]: Start difference. First operand 39 states and 41 transitions. Second operand has 29 states, 28 states have (on average 2.892857142857143) internal successors, (81), 29 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:30:50,822 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 00:30:50,822 INFO L93 Difference]: Finished difference Result 46 states and 48 transitions. [2022-11-22 00:30:50,822 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-11-22 00:30:50,823 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 28 states have (on average 2.892857142857143) internal successors, (81), 29 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 38 [2022-11-22 00:30:50,823 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 00:30:50,823 INFO L225 Difference]: With dead ends: 46 [2022-11-22 00:30:50,823 INFO L226 Difference]: Without dead ends: 46 [2022-11-22 00:30:50,824 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 82 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 697 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=405, Invalid=2351, Unknown=0, NotChecked=0, Total=2756 [2022-11-22 00:30:50,824 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 210 mSDsluCounter, 53 mSDsCounter, 0 mSdLazyCounter, 237 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 210 SdHoareTripleChecker+Valid, 64 SdHoareTripleChecker+Invalid, 248 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 237 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 00:30:50,825 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [210 Valid, 64 Invalid, 248 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 237 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 00:30:50,825 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2022-11-22 00:30:50,826 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2022-11-22 00:30:50,826 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 44 states have (on average 1.0681818181818181) internal successors, (47), 44 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:30:50,826 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 47 transitions. [2022-11-22 00:30:50,826 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 47 transitions. Word has length 38 [2022-11-22 00:30:50,827 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 00:30:50,827 INFO L495 AbstractCegarLoop]: Abstraction has 45 states and 47 transitions. [2022-11-22 00:30:50,827 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 28 states have (on average 2.892857142857143) internal successors, (81), 29 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:30:50,827 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 47 transitions. [2022-11-22 00:30:50,827 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-11-22 00:30:50,827 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:30:50,827 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 00:30:50,839 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2022-11-22 00:30:51,033 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:30:51,034 INFO L420 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-22 00:30:51,034 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:30:51,034 INFO L85 PathProgramCache]: Analyzing trace with hash -489766282, now seen corresponding path program 4 times [2022-11-22 00:30:51,034 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:30:51,034 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [191020855] [2022-11-22 00:30:51,035 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:30:51,035 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:30:51,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:30:51,766 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 31 proven. 22 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-22 00:30:51,766 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:30:51,766 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [191020855] [2022-11-22 00:30:51,766 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [191020855] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 00:30:51,767 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1126406769] [2022-11-22 00:30:51,767 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 00:30:51,767 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:30:51,767 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 [2022-11-22 00:30:51,769 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 00:30:51,775 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-11-22 00:30:51,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:30:51,939 INFO L263 TraceCheckSpWp]: Trace formula consists of 354 conjuncts, 112 conjunts are in the unsatisfiable core [2022-11-22 00:30:51,941 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 00:30:52,235 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:30:53,014 INFO L321 Elim1Store]: treesize reduction 32, result has 8.6 percent of original size [2022-11-22 00:30:53,015 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 29 treesize of output 13 [2022-11-22 00:30:53,058 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 11 proven. 51 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 00:30:53,058 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 00:30:53,686 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-22 00:30:53,686 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 99 treesize of output 99 [2022-11-22 00:30:53,694 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 26 [2022-11-22 00:30:53,721 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-22 00:30:53,721 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 45 treesize of output 37 [2022-11-22 00:30:54,044 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 11 proven. 42 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-22 00:30:54,044 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1126406769] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 00:30:54,044 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1641303888] [2022-11-22 00:30:54,046 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-11-22 00:30:54,046 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 00:30:54,046 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 00:30:54,047 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 00:30:54,047 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 00:30:54,078 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 00:30:54,079 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-22 00:30:54,129 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-22 00:30:54,176 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:30:54,219 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:30:54,263 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:30:54,313 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 85 treesize of output 77 [2022-11-22 00:30:54,375 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:30:54,415 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:30:54,467 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-22 00:30:54,468 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-22 00:30:54,912 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 00:30:58,968 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5291#(and (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc14#1.base|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_#t~nondet19#1| 2147483647) (<= 0 |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#t~post3#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_cstrncmp_~s2#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrncmp_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cstrncmp_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#in~s1#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrncmp_~s1#1.base|) (<= 0 (+ 2147483648 |ULTIMATE.start_main_#t~nondet19#1|)) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (< (select |#length| |ULTIMATE.start_cstrncmp_#t~post3#1.base|) (+ 1 |ULTIMATE.start_cstrncmp_#t~post3#1.offset|)) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrncmp_#in~n#1| 2147483647) (= |#NULL.offset| 0) (<= 0 (+ |ULTIMATE.start_cstrncmp_#in~n#1| 2147483648)) (<= 0 |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrncmp_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_cstrncmp_~s1#1.offset|) (= |ULTIMATE.start_main_#t~malloc14#1.offset| 0) (<= |ULTIMATE.start_cstrncmp_#in~s1#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrncmp_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-22 00:30:58,968 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 00:30:58,968 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 00:30:58,968 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 22, 19] total 52 [2022-11-22 00:30:58,968 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [510845572] [2022-11-22 00:30:58,969 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 00:30:58,969 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2022-11-22 00:30:58,969 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 00:30:58,970 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2022-11-22 00:30:58,971 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=239, Invalid=4051, Unknown=0, NotChecked=0, Total=4290 [2022-11-22 00:30:58,971 INFO L87 Difference]: Start difference. First operand 45 states and 47 transitions. Second operand has 52 states, 52 states have (on average 2.2884615384615383) internal successors, (119), 52 states have internal predecessors, (119), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:31:03,196 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 00:31:03,196 INFO L93 Difference]: Finished difference Result 141 states and 144 transitions. [2022-11-22 00:31:03,196 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2022-11-22 00:31:03,197 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 2.2884615384615383) internal successors, (119), 52 states have internal predecessors, (119), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 44 [2022-11-22 00:31:03,197 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 00:31:03,197 INFO L225 Difference]: With dead ends: 141 [2022-11-22 00:31:03,197 INFO L226 Difference]: Without dead ends: 51 [2022-11-22 00:31:03,200 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 190 GetRequests, 80 SyntacticMatches, 0 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2815 ImplicationChecksByTransitivity, 8.9s TimeCoverageRelationStatistics Valid=922, Invalid=11510, Unknown=0, NotChecked=0, Total=12432 [2022-11-22 00:31:03,201 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 336 mSDsluCounter, 197 mSDsCounter, 0 mSdLazyCounter, 1332 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 336 SdHoareTripleChecker+Valid, 203 SdHoareTripleChecker+Invalid, 1365 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 1332 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-11-22 00:31:03,201 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [336 Valid, 203 Invalid, 1365 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 1332 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-11-22 00:31:03,201 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2022-11-22 00:31:03,202 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 49. [2022-11-22 00:31:03,203 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 48 states have (on average 1.0625) internal successors, (51), 48 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:31:03,203 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 51 transitions. [2022-11-22 00:31:03,203 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 51 transitions. Word has length 44 [2022-11-22 00:31:03,203 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 00:31:03,203 INFO L495 AbstractCegarLoop]: Abstraction has 49 states and 51 transitions. [2022-11-22 00:31:03,203 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 52 states have (on average 2.2884615384615383) internal successors, (119), 52 states have internal predecessors, (119), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:31:03,204 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 51 transitions. [2022-11-22 00:31:03,204 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2022-11-22 00:31:03,204 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:31:03,204 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 00:31:03,218 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-11-22 00:31:03,411 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:31:03,411 INFO L420 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-22 00:31:03,412 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:31:03,412 INFO L85 PathProgramCache]: Analyzing trace with hash -690949694, now seen corresponding path program 5 times [2022-11-22 00:31:03,412 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:31:03,412 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [373661075] [2022-11-22 00:31:03,412 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:31:03,412 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:31:03,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:31:04,031 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 4 proven. 56 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-11-22 00:31:04,032 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:31:04,032 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [373661075] [2022-11-22 00:31:04,032 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [373661075] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 00:31:04,032 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [823967570] [2022-11-22 00:31:04,032 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 00:31:04,033 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:31:04,033 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 [2022-11-22 00:31:04,034 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 00:31:04,036 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-11-22 00:31:04,324 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-11-22 00:31:04,324 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 00:31:04,328 INFO L263 TraceCheckSpWp]: Trace formula consists of 380 conjuncts, 45 conjunts are in the unsatisfiable core [2022-11-22 00:31:04,330 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 00:31:04,611 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 9 proven. 51 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-11-22 00:31:04,611 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 00:31:04,914 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2022-11-22 00:31:04,985 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 9 proven. 51 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-11-22 00:31:04,985 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [823967570] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 00:31:04,986 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [316580322] [2022-11-22 00:31:04,987 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-11-22 00:31:04,987 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 00:31:04,987 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 00:31:04,988 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 00:31:04,988 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 00:31:05,015 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 00:31:05,019 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-22 00:31:05,053 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:31:05,089 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:31:05,108 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:31:05,165 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:31:05,193 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:31:05,210 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:31:05,276 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-22 00:31:05,277 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-22 00:31:05,922 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 00:31:09,313 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5903#(and (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc14#1.base|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_#t~nondet19#1| 2147483647) (<= 0 |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#t~post3#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_cstrncmp_~s2#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrncmp_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cstrncmp_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#in~s1#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrncmp_~s1#1.base|) (<= 0 (+ 2147483648 |ULTIMATE.start_main_#t~nondet19#1|)) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (< (select |#length| |ULTIMATE.start_cstrncmp_#t~post3#1.base|) (+ 1 |ULTIMATE.start_cstrncmp_#t~post3#1.offset|)) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrncmp_#in~n#1| 2147483647) (= |#NULL.offset| 0) (<= 0 (+ |ULTIMATE.start_cstrncmp_#in~n#1| 2147483648)) (<= 0 |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrncmp_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_cstrncmp_~s1#1.offset|) (= |ULTIMATE.start_main_#t~malloc14#1.offset| 0) (<= |ULTIMATE.start_cstrncmp_#in~s1#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrncmp_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-22 00:31:09,314 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 00:31:09,314 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 00:31:09,314 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 33 [2022-11-22 00:31:09,314 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1775212229] [2022-11-22 00:31:09,315 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 00:31:09,315 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2022-11-22 00:31:09,316 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 00:31:09,317 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2022-11-22 00:31:09,318 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=250, Invalid=2006, Unknown=0, NotChecked=0, Total=2256 [2022-11-22 00:31:09,326 INFO L87 Difference]: Start difference. First operand 49 states and 51 transitions. Second operand has 34 states, 33 states have (on average 3.393939393939394) internal successors, (112), 34 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:31:09,916 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 00:31:09,916 INFO L93 Difference]: Finished difference Result 56 states and 58 transitions. [2022-11-22 00:31:09,917 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-11-22 00:31:09,917 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 33 states have (on average 3.393939393939394) internal successors, (112), 34 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 48 [2022-11-22 00:31:09,917 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 00:31:09,917 INFO L225 Difference]: With dead ends: 56 [2022-11-22 00:31:09,917 INFO L226 Difference]: Without dead ends: 56 [2022-11-22 00:31:09,918 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 104 SyntacticMatches, 5 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1087 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=497, Invalid=3043, Unknown=0, NotChecked=0, Total=3540 [2022-11-22 00:31:09,919 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 256 mSDsluCounter, 81 mSDsCounter, 0 mSdLazyCounter, 358 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 256 SdHoareTripleChecker+Valid, 94 SdHoareTripleChecker+Invalid, 374 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 358 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 00:31:09,919 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [256 Valid, 94 Invalid, 374 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 358 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 00:31:09,919 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2022-11-22 00:31:09,920 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2022-11-22 00:31:09,921 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 54 states have (on average 1.0555555555555556) internal successors, (57), 54 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:31:09,921 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 57 transitions. [2022-11-22 00:31:09,921 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 57 transitions. Word has length 48 [2022-11-22 00:31:09,921 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 00:31:09,921 INFO L495 AbstractCegarLoop]: Abstraction has 55 states and 57 transitions. [2022-11-22 00:31:09,922 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 33 states have (on average 3.393939393939394) internal successors, (112), 34 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:31:09,922 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 57 transitions. [2022-11-22 00:31:09,922 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2022-11-22 00:31:09,922 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:31:09,922 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 5, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 00:31:09,933 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-11-22 00:31:10,122 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable31 [2022-11-22 00:31:10,123 INFO L420 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-22 00:31:10,123 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:31:10,123 INFO L85 PathProgramCache]: Analyzing trace with hash 2068058717, now seen corresponding path program 6 times [2022-11-22 00:31:10,123 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:31:10,123 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1223559869] [2022-11-22 00:31:10,123 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:31:10,124 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:31:10,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:31:11,148 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 53 proven. 33 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-11-22 00:31:11,149 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:31:11,149 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1223559869] [2022-11-22 00:31:11,149 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1223559869] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 00:31:11,149 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [563461746] [2022-11-22 00:31:11,149 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 00:31:11,149 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:31:11,149 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 [2022-11-22 00:31:11,150 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 00:31:11,153 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-11-22 00:31:11,340 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 00:31:11,341 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 00:31:11,344 INFO L263 TraceCheckSpWp]: Trace formula consists of 422 conjuncts, 110 conjunts are in the unsatisfiable core [2022-11-22 00:31:11,346 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 00:31:11,515 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:31:12,210 INFO L321 Elim1Store]: treesize reduction 34, result has 8.1 percent of original size [2022-11-22 00:31:12,211 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 29 treesize of output 13 [2022-11-22 00:31:12,248 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 14 proven. 72 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-11-22 00:31:12,248 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 00:31:15,089 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-22 00:31:15,089 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 99 treesize of output 99 [2022-11-22 00:31:15,121 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 26 [2022-11-22 00:31:15,137 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-22 00:31:15,138 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 45 treesize of output 37 [2022-11-22 00:31:15,404 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 14 proven. 72 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-11-22 00:31:15,405 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [563461746] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 00:31:15,405 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1844516720] [2022-11-22 00:31:15,406 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-11-22 00:31:15,407 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 00:31:15,407 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 00:31:15,407 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 00:31:15,407 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 00:31:15,440 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 00:31:15,446 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-22 00:31:15,483 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-22 00:31:15,535 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:31:15,596 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:31:15,641 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:31:15,695 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 85 treesize of output 77 [2022-11-22 00:31:15,752 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:31:15,787 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:31:15,846 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-22 00:31:15,847 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-22 00:31:16,335 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 00:31:20,368 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6417#(and (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc14#1.base|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_#t~nondet19#1| 2147483647) (<= 0 |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#t~post3#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_cstrncmp_~s2#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrncmp_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cstrncmp_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#in~s1#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrncmp_~s1#1.base|) (<= 0 (+ 2147483648 |ULTIMATE.start_main_#t~nondet19#1|)) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (< (select |#length| |ULTIMATE.start_cstrncmp_#t~post3#1.base|) (+ 1 |ULTIMATE.start_cstrncmp_#t~post3#1.offset|)) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrncmp_#in~n#1| 2147483647) (= |#NULL.offset| 0) (<= 0 (+ |ULTIMATE.start_cstrncmp_#in~n#1| 2147483648)) (<= 0 |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrncmp_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_cstrncmp_~s1#1.offset|) (= |ULTIMATE.start_main_#t~malloc14#1.offset| 0) (<= |ULTIMATE.start_cstrncmp_#in~s1#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrncmp_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-22 00:31:20,369 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 00:31:20,369 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 00:31:20,369 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 18, 22] total 47 [2022-11-22 00:31:20,369 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1463392521] [2022-11-22 00:31:20,369 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 00:31:20,370 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2022-11-22 00:31:20,370 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 00:31:20,371 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2022-11-22 00:31:20,371 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=3467, Unknown=1, NotChecked=0, Total=3660 [2022-11-22 00:31:20,372 INFO L87 Difference]: Start difference. First operand 55 states and 57 transitions. Second operand has 47 states, 47 states have (on average 2.723404255319149) internal successors, (128), 47 states have internal predecessors, (128), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:31:25,157 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 00:31:25,157 INFO L93 Difference]: Finished difference Result 171 states and 174 transitions. [2022-11-22 00:31:25,158 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2022-11-22 00:31:25,158 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 2.723404255319149) internal successors, (128), 47 states have internal predecessors, (128), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 54 [2022-11-22 00:31:25,158 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 00:31:25,159 INFO L225 Difference]: With dead ends: 171 [2022-11-22 00:31:25,159 INFO L226 Difference]: Without dead ends: 61 [2022-11-22 00:31:25,160 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 225 GetRequests, 115 SyntacticMatches, 2 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 2830 ImplicationChecksByTransitivity, 11.1s TimeCoverageRelationStatistics Valid=838, Invalid=11151, Unknown=1, NotChecked=0, Total=11990 [2022-11-22 00:31:25,160 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 356 mSDsluCounter, 244 mSDsCounter, 0 mSdLazyCounter, 1512 mSolverCounterSat, 39 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 356 SdHoareTripleChecker+Valid, 251 SdHoareTripleChecker+Invalid, 1551 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 1512 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2022-11-22 00:31:25,161 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [356 Valid, 251 Invalid, 1551 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [39 Valid, 1512 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2022-11-22 00:31:25,161 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2022-11-22 00:31:25,162 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 59. [2022-11-22 00:31:25,162 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 58 states have (on average 1.0517241379310345) internal successors, (61), 58 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:31:25,163 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 61 transitions. [2022-11-22 00:31:25,163 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 61 transitions. Word has length 54 [2022-11-22 00:31:25,163 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 00:31:25,163 INFO L495 AbstractCegarLoop]: Abstraction has 59 states and 61 transitions. [2022-11-22 00:31:25,164 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 47 states have (on average 2.723404255319149) internal successors, (128), 47 states have internal predecessors, (128), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:31:25,164 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 61 transitions. [2022-11-22 00:31:25,164 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2022-11-22 00:31:25,165 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:31:25,165 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 00:31:25,173 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-11-22 00:31:25,373 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2022-11-22 00:31:25,373 INFO L420 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-22 00:31:25,374 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:31:25,374 INFO L85 PathProgramCache]: Analyzing trace with hash 1634651177, now seen corresponding path program 7 times [2022-11-22 00:31:25,374 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:31:25,374 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1549187699] [2022-11-22 00:31:25,374 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:31:25,374 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:31:25,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:31:26,262 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 9 proven. 86 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2022-11-22 00:31:26,262 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:31:26,262 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1549187699] [2022-11-22 00:31:26,263 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1549187699] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 00:31:26,263 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1345354330] [2022-11-22 00:31:26,263 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 00:31:26,263 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:31:26,263 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 [2022-11-22 00:31:26,267 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 00:31:26,272 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-11-22 00:31:26,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:31:26,467 INFO L263 TraceCheckSpWp]: Trace formula consists of 448 conjuncts, 60 conjunts are in the unsatisfiable core [2022-11-22 00:31:26,469 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 00:31:26,774 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 16 proven. 79 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2022-11-22 00:31:26,774 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 00:31:27,109 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2022-11-22 00:31:27,205 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 16 proven. 79 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2022-11-22 00:31:27,205 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1345354330] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 00:31:27,205 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [990969680] [2022-11-22 00:31:27,207 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-11-22 00:31:27,207 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 00:31:27,207 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 00:31:27,207 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 00:31:27,208 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 00:31:27,237 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 00:31:27,238 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-22 00:31:27,275 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-22 00:31:27,314 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:31:27,357 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:31:27,397 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:31:27,436 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 85 treesize of output 77 [2022-11-22 00:31:27,481 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:31:27,515 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:31:27,570 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-22 00:31:27,570 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-22 00:31:27,977 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 00:31:30,956 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7134#(and (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc14#1.base|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_#t~nondet19#1| 2147483647) (<= 0 |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#t~post3#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_cstrncmp_~s2#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrncmp_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cstrncmp_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#in~s1#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrncmp_~s1#1.base|) (<= 0 (+ 2147483648 |ULTIMATE.start_main_#t~nondet19#1|)) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (< (select |#length| |ULTIMATE.start_cstrncmp_#t~post3#1.base|) (+ 1 |ULTIMATE.start_cstrncmp_#t~post3#1.offset|)) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrncmp_#in~n#1| 2147483647) (= |#NULL.offset| 0) (<= 0 (+ |ULTIMATE.start_cstrncmp_#in~n#1| 2147483648)) (<= 0 |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrncmp_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_cstrncmp_~s1#1.offset|) (= |ULTIMATE.start_main_#t~malloc14#1.offset| 0) (<= |ULTIMATE.start_cstrncmp_#in~s1#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrncmp_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-22 00:31:30,956 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 00:31:30,956 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 00:31:30,956 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 32 [2022-11-22 00:31:30,956 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1200665636] [2022-11-22 00:31:30,956 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 00:31:30,957 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2022-11-22 00:31:30,957 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 00:31:30,957 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2022-11-22 00:31:30,957 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=229, Invalid=1933, Unknown=0, NotChecked=0, Total=2162 [2022-11-22 00:31:30,958 INFO L87 Difference]: Start difference. First operand 59 states and 61 transitions. Second operand has 33 states, 32 states have (on average 3.25) internal successors, (104), 33 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:31:31,686 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 00:31:31,687 INFO L93 Difference]: Finished difference Result 66 states and 68 transitions. [2022-11-22 00:31:31,687 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-11-22 00:31:31,687 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 32 states have (on average 3.25) internal successors, (104), 33 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 58 [2022-11-22 00:31:31,687 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 00:31:31,688 INFO L225 Difference]: With dead ends: 66 [2022-11-22 00:31:31,688 INFO L226 Difference]: Without dead ends: 66 [2022-11-22 00:31:31,689 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 201 GetRequests, 136 SyntacticMatches, 6 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1058 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=510, Invalid=3150, Unknown=0, NotChecked=0, Total=3660 [2022-11-22 00:31:31,689 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 197 mSDsluCounter, 121 mSDsCounter, 0 mSdLazyCounter, 502 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 197 SdHoareTripleChecker+Valid, 136 SdHoareTripleChecker+Invalid, 514 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 502 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-22 00:31:31,690 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [197 Valid, 136 Invalid, 514 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 502 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-22 00:31:31,690 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2022-11-22 00:31:31,692 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2022-11-22 00:31:31,692 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 64 states have (on average 1.046875) internal successors, (67), 64 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:31:31,692 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 67 transitions. [2022-11-22 00:31:31,693 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 67 transitions. Word has length 58 [2022-11-22 00:31:31,693 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 00:31:31,693 INFO L495 AbstractCegarLoop]: Abstraction has 65 states and 67 transitions. [2022-11-22 00:31:31,693 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 32 states have (on average 3.25) internal successors, (104), 33 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:31:31,694 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 67 transitions. [2022-11-22 00:31:31,694 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2022-11-22 00:31:31,694 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:31:31,694 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 6, 6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 00:31:31,708 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2022-11-22 00:31:31,901 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:31:31,902 INFO L420 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-22 00:31:31,902 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:31:31,902 INFO L85 PathProgramCache]: Analyzing trace with hash 859325316, now seen corresponding path program 8 times [2022-11-22 00:31:31,902 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:31:31,902 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [283969609] [2022-11-22 00:31:31,903 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:31:31,903 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:31:31,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:31:33,131 INFO L134 CoverageAnalysis]: Checked inductivity of 152 backedges. 81 proven. 46 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2022-11-22 00:31:33,131 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:31:33,132 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [283969609] [2022-11-22 00:31:33,132 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [283969609] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 00:31:33,132 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1506179760] [2022-11-22 00:31:33,132 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 00:31:33,132 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:31:33,132 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 [2022-11-22 00:31:33,133 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 00:31:33,136 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-11-22 00:31:33,610 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2022-11-22 00:31:33,610 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 00:31:33,616 INFO L263 TraceCheckSpWp]: Trace formula consists of 490 conjuncts, 96 conjunts are in the unsatisfiable core [2022-11-22 00:31:33,620 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 00:31:33,644 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-22 00:31:33,645 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2022-11-22 00:31:33,667 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2022-11-22 00:31:34,401 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2022-11-22 00:31:34,407 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-22 00:31:34,517 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 22 [2022-11-22 00:31:35,588 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 00:31:35,598 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-22 00:31:35,599 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 10 [2022-11-22 00:31:35,644 INFO L134 CoverageAnalysis]: Checked inductivity of 152 backedges. 17 proven. 110 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2022-11-22 00:31:35,644 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 00:31:36,047 WARN L837 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_812 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~nondetString2~0#1.base| v_ArrVal_812) |c_ULTIMATE.start_main_~nondetString1~0#1.base|) (+ 5 |c_ULTIMATE.start_main_~nondetString1~0#1.offset|)) 0)) is different from false [2022-11-22 00:31:36,056 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-22 00:31:36,056 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 24 [2022-11-22 00:31:36,067 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-22 00:31:36,067 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 37 treesize of output 32 [2022-11-22 00:31:36,076 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2022-11-22 00:31:36,973 INFO L134 CoverageAnalysis]: Checked inductivity of 152 backedges. 17 proven. 110 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2022-11-22 00:31:36,973 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1506179760] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 00:31:36,973 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1076360037] [2022-11-22 00:31:36,975 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-11-22 00:31:36,975 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 00:31:36,975 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 00:31:36,976 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 00:31:36,976 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 00:31:37,012 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 00:31:37,017 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-22 00:31:37,052 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:31:37,096 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:31:37,117 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:31:37,166 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-22 00:31:37,193 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:31:37,215 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:31:37,263 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-22 00:31:37,263 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-22 00:31:37,855 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 00:31:42,419 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7738#(and (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc14#1.base|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_#t~nondet19#1| 2147483647) (<= 0 |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#t~post3#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_cstrncmp_~s2#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrncmp_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cstrncmp_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#in~s1#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrncmp_~s1#1.base|) (<= 0 (+ 2147483648 |ULTIMATE.start_main_#t~nondet19#1|)) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (< (select |#length| |ULTIMATE.start_cstrncmp_#t~post3#1.base|) (+ 1 |ULTIMATE.start_cstrncmp_#t~post3#1.offset|)) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrncmp_#in~n#1| 2147483647) (= |#NULL.offset| 0) (<= 0 (+ |ULTIMATE.start_cstrncmp_#in~n#1| 2147483648)) (<= 0 |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrncmp_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_cstrncmp_~s1#1.offset|) (= |ULTIMATE.start_main_#t~malloc14#1.offset| 0) (<= |ULTIMATE.start_cstrncmp_#in~s1#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrncmp_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-22 00:31:42,419 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 00:31:42,419 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 00:31:42,419 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 19, 18] total 52 [2022-11-22 00:31:42,419 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1390069172] [2022-11-22 00:31:42,419 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 00:31:42,420 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2022-11-22 00:31:42,420 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 00:31:42,420 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2022-11-22 00:31:42,421 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=218, Invalid=4075, Unknown=1, NotChecked=128, Total=4422 [2022-11-22 00:31:42,421 INFO L87 Difference]: Start difference. First operand 65 states and 67 transitions. Second operand has 53 states, 53 states have (on average 3.0754716981132075) internal successors, (163), 52 states have internal predecessors, (163), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:31:48,518 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 00:31:48,518 INFO L93 Difference]: Finished difference Result 117 states and 120 transitions. [2022-11-22 00:31:48,518 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-11-22 00:31:48,519 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 3.0754716981132075) internal successors, (163), 52 states have internal predecessors, (163), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 64 [2022-11-22 00:31:48,519 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 00:31:48,519 INFO L225 Difference]: With dead ends: 117 [2022-11-22 00:31:48,519 INFO L226 Difference]: Without dead ends: 68 [2022-11-22 00:31:48,520 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 231 GetRequests, 142 SyntacticMatches, 1 SemanticMatches, 88 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 1615 ImplicationChecksByTransitivity, 10.5s TimeCoverageRelationStatistics Valid=586, Invalid=7246, Unknown=4, NotChecked=174, Total=8010 [2022-11-22 00:31:48,520 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 343 mSDsluCounter, 206 mSDsCounter, 0 mSdLazyCounter, 1362 mSolverCounterSat, 34 mSolverCounterUnsat, 28 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 343 SdHoareTripleChecker+Valid, 213 SdHoareTripleChecker+Invalid, 1487 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 1362 IncrementalHoareTripleChecker+Invalid, 28 IncrementalHoareTripleChecker+Unknown, 63 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2022-11-22 00:31:48,520 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [343 Valid, 213 Invalid, 1487 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 1362 Invalid, 28 Unknown, 63 Unchecked, 2.5s Time] [2022-11-22 00:31:48,521 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2022-11-22 00:31:48,522 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 67. [2022-11-22 00:31:48,522 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 66 states have (on average 1.0454545454545454) internal successors, (69), 66 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:31:48,522 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 69 transitions. [2022-11-22 00:31:48,523 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 69 transitions. Word has length 64 [2022-11-22 00:31:48,523 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 00:31:48,523 INFO L495 AbstractCegarLoop]: Abstraction has 67 states and 69 transitions. [2022-11-22 00:31:48,523 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 53 states have (on average 3.0754716981132075) internal successors, (163), 52 states have internal predecessors, (163), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:31:48,523 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 69 transitions. [2022-11-22 00:31:48,524 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2022-11-22 00:31:48,524 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:31:48,524 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 6, 6, 6, 6, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 00:31:48,530 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Ended with exit code 0 [2022-11-22 00:31:48,727 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2022-11-22 00:31:48,727 INFO L420 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-22 00:31:48,728 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:31:48,728 INFO L85 PathProgramCache]: Analyzing trace with hash -391778201, now seen corresponding path program 9 times [2022-11-22 00:31:48,728 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:31:48,728 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1070356082] [2022-11-22 00:31:48,728 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:31:48,728 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:31:48,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:31:50,380 INFO L134 CoverageAnalysis]: Checked inductivity of 163 backedges. 17 proven. 146 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 00:31:50,380 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:31:50,380 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1070356082] [2022-11-22 00:31:50,380 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1070356082] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 00:31:50,380 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [833429364] [2022-11-22 00:31:50,380 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 00:31:50,381 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:31:50,381 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 [2022-11-22 00:31:50,382 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 00:31:50,384 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-11-22 00:31:50,717 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 00:31:50,717 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 00:31:50,723 INFO L263 TraceCheckSpWp]: Trace formula consists of 503 conjuncts, 132 conjunts are in the unsatisfiable core [2022-11-22 00:31:50,726 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 00:31:51,137 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:31:51,447 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2022-11-22 00:31:51,449 INFO L134 CoverageAnalysis]: Checked inductivity of 163 backedges. 17 proven. 110 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-11-22 00:31:51,450 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 00:31:54,396 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-22 00:31:54,397 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 99 treesize of output 99 [2022-11-22 00:31:54,407 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 26 [2022-11-22 00:31:54,441 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-22 00:31:54,441 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 45 treesize of output 37 [2022-11-22 00:31:54,913 INFO L134 CoverageAnalysis]: Checked inductivity of 163 backedges. 17 proven. 110 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-11-22 00:31:54,914 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [833429364] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 00:31:54,914 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1834922584] [2022-11-22 00:31:54,915 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-11-22 00:31:54,916 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 00:31:54,916 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 00:31:54,916 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 00:31:54,916 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 00:31:54,941 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 00:31:54,942 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-22 00:31:54,977 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-22 00:31:55,036 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:31:55,078 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:31:55,123 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-22 00:31:55,181 INFO L321 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-11-22 00:31:55,182 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 84 treesize of output 83 [2022-11-22 00:31:55,240 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:31:55,259 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:31:55,298 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-22 00:31:55,298 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-22 00:31:55,926 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 00:32:01,175 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8432#(and (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc14#1.base|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_#t~nondet19#1| 2147483647) (<= 0 |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#t~post3#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_cstrncmp_~s2#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrncmp_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cstrncmp_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#in~s1#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrncmp_~s1#1.base|) (<= 0 (+ 2147483648 |ULTIMATE.start_main_#t~nondet19#1|)) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (< (select |#length| |ULTIMATE.start_cstrncmp_#t~post3#1.base|) (+ 1 |ULTIMATE.start_cstrncmp_#t~post3#1.offset|)) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrncmp_#in~n#1| 2147483647) (= |#NULL.offset| 0) (<= 0 (+ |ULTIMATE.start_cstrncmp_#in~n#1| 2147483648)) (<= 0 |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrncmp_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_cstrncmp_~s1#1.offset|) (= |ULTIMATE.start_main_#t~malloc14#1.offset| 0) (<= |ULTIMATE.start_cstrncmp_#in~s1#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrncmp_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-22 00:32:01,176 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 00:32:01,176 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 00:32:01,176 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 20, 25] total 60 [2022-11-22 00:32:01,177 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [606827704] [2022-11-22 00:32:01,177 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 00:32:01,177 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 60 states [2022-11-22 00:32:01,178 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 00:32:01,178 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2022-11-22 00:32:01,179 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=308, Invalid=5093, Unknown=1, NotChecked=0, Total=5402 [2022-11-22 00:32:01,179 INFO L87 Difference]: Start difference. First operand 67 states and 69 transitions. Second operand has 60 states, 60 states have (on average 2.316666666666667) internal successors, (139), 60 states have internal predecessors, (139), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:32:03,737 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 00:32:03,737 INFO L93 Difference]: Finished difference Result 109 states and 111 transitions. [2022-11-22 00:32:03,737 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-11-22 00:32:03,738 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 60 states have (on average 2.316666666666667) internal successors, (139), 60 states have internal predecessors, (139), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 66 [2022-11-22 00:32:03,738 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 00:32:03,738 INFO L225 Difference]: With dead ends: 109 [2022-11-22 00:32:03,738 INFO L226 Difference]: Without dead ends: 71 [2022-11-22 00:32:03,743 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 246 GetRequests, 149 SyntacticMatches, 2 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2156 ImplicationChecksByTransitivity, 10.8s TimeCoverageRelationStatistics Valid=671, Invalid=8640, Unknown=1, NotChecked=0, Total=9312 [2022-11-22 00:32:03,744 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 231 mSDsluCounter, 310 mSDsCounter, 0 mSdLazyCounter, 1836 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 231 SdHoareTripleChecker+Valid, 322 SdHoareTripleChecker+Invalid, 1865 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 1836 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2022-11-22 00:32:03,744 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [231 Valid, 322 Invalid, 1865 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 1836 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2022-11-22 00:32:03,745 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2022-11-22 00:32:03,747 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 69. [2022-11-22 00:32:03,748 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 68 states have (on average 1.0441176470588236) internal successors, (71), 68 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:32:03,748 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 71 transitions. [2022-11-22 00:32:03,748 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 71 transitions. Word has length 66 [2022-11-22 00:32:03,749 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 00:32:03,749 INFO L495 AbstractCegarLoop]: Abstraction has 69 states and 71 transitions. [2022-11-22 00:32:03,749 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 60 states, 60 states have (on average 2.316666666666667) internal successors, (139), 60 states have internal predecessors, (139), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:32:03,749 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 71 transitions. [2022-11-22 00:32:03,750 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2022-11-22 00:32:03,750 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:32:03,750 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 00:32:03,755 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Ended with exit code 0 [2022-11-22 00:32:03,950 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:32:03,951 INFO L420 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-22 00:32:03,951 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:32:03,951 INFO L85 PathProgramCache]: Analyzing trace with hash -2127632432, now seen corresponding path program 10 times [2022-11-22 00:32:03,952 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:32:03,952 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [590845546] [2022-11-22 00:32:03,952 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:32:03,952 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:32:03,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:32:04,852 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 16 proven. 122 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-11-22 00:32:04,852 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:32:04,852 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [590845546] [2022-11-22 00:32:04,852 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [590845546] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 00:32:04,852 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1364053012] [2022-11-22 00:32:04,852 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 00:32:04,853 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:32:04,853 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 [2022-11-22 00:32:04,854 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 00:32:04,856 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-11-22 00:32:05,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:32:05,044 INFO L263 TraceCheckSpWp]: Trace formula consists of 516 conjuncts, 69 conjunts are in the unsatisfiable core [2022-11-22 00:32:05,046 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 00:32:05,376 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 25 proven. 113 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-11-22 00:32:05,376 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 00:32:05,807 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2022-11-22 00:32:05,968 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 25 proven. 113 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-11-22 00:32:05,968 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1364053012] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 00:32:05,969 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [404128278] [2022-11-22 00:32:05,970 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-11-22 00:32:05,970 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 00:32:05,971 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 00:32:05,971 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 00:32:05,971 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 00:32:06,014 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 00:32:06,015 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-22 00:32:06,046 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-22 00:32:06,100 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:32:06,137 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:32:06,202 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-22 00:32:06,257 INFO L321 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-11-22 00:32:06,258 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 84 treesize of output 83 [2022-11-22 00:32:06,313 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:32:06,335 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:32:06,381 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-22 00:32:06,381 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-22 00:32:07,100 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 00:32:11,401 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9109#(and (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc14#1.base|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_#t~nondet19#1| 2147483647) (<= 0 |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#t~post3#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_cstrncmp_~s2#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrncmp_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cstrncmp_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#in~s1#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrncmp_~s1#1.base|) (<= 0 (+ 2147483648 |ULTIMATE.start_main_#t~nondet19#1|)) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (< (select |#length| |ULTIMATE.start_cstrncmp_#t~post3#1.base|) (+ 1 |ULTIMATE.start_cstrncmp_#t~post3#1.offset|)) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrncmp_#in~n#1| 2147483647) (= |#NULL.offset| 0) (<= 0 (+ |ULTIMATE.start_cstrncmp_#in~n#1| 2147483648)) (<= 0 |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrncmp_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_cstrncmp_~s1#1.offset|) (= |ULTIMATE.start_main_#t~malloc14#1.offset| 0) (<= |ULTIMATE.start_cstrncmp_#in~s1#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrncmp_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-22 00:32:11,401 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 00:32:11,401 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 00:32:11,402 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 36 [2022-11-22 00:32:11,402 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [699051051] [2022-11-22 00:32:11,402 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 00:32:11,402 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2022-11-22 00:32:11,402 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 00:32:11,403 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2022-11-22 00:32:11,403 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=254, Invalid=2296, Unknown=0, NotChecked=0, Total=2550 [2022-11-22 00:32:11,403 INFO L87 Difference]: Start difference. First operand 69 states and 71 transitions. Second operand has 37 states, 36 states have (on average 3.3333333333333335) internal successors, (120), 37 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:32:12,263 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 00:32:12,264 INFO L93 Difference]: Finished difference Result 76 states and 78 transitions. [2022-11-22 00:32:12,264 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-11-22 00:32:12,264 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 36 states have (on average 3.3333333333333335) internal successors, (120), 37 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 68 [2022-11-22 00:32:12,265 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 00:32:12,265 INFO L225 Difference]: With dead ends: 76 [2022-11-22 00:32:12,265 INFO L226 Difference]: Without dead ends: 76 [2022-11-22 00:32:12,266 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 235 GetRequests, 163 SyntacticMatches, 7 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1310 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=615, Invalid=3807, Unknown=0, NotChecked=0, Total=4422 [2022-11-22 00:32:12,266 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 471 mSDsluCounter, 139 mSDsCounter, 0 mSdLazyCounter, 568 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 471 SdHoareTripleChecker+Valid, 156 SdHoareTripleChecker+Invalid, 582 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 568 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-22 00:32:12,267 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [471 Valid, 156 Invalid, 582 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 568 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-22 00:32:12,267 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2022-11-22 00:32:12,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 75. [2022-11-22 00:32:12,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 74 states have (on average 1.0405405405405406) internal successors, (77), 74 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:32:12,270 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 77 transitions. [2022-11-22 00:32:12,270 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 77 transitions. Word has length 68 [2022-11-22 00:32:12,270 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 00:32:12,271 INFO L495 AbstractCegarLoop]: Abstraction has 75 states and 77 transitions. [2022-11-22 00:32:12,271 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 36 states have (on average 3.3333333333333335) internal successors, (120), 37 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:32:12,271 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 77 transitions. [2022-11-22 00:32:12,272 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2022-11-22 00:32:12,272 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:32:12,272 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 7, 7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 00:32:12,283 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Ended with exit code 0 [2022-11-22 00:32:12,479 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2022-11-22 00:32:12,480 INFO L420 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-22 00:32:12,480 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:32:12,480 INFO L85 PathProgramCache]: Analyzing trace with hash 1298712043, now seen corresponding path program 11 times [2022-11-22 00:32:12,480 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:32:12,480 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [804581829] [2022-11-22 00:32:12,480 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:32:12,481 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:32:12,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:32:13,970 INFO L134 CoverageAnalysis]: Checked inductivity of 212 backedges. 115 proven. 61 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-11-22 00:32:13,970 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:32:13,970 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [804581829] [2022-11-22 00:32:13,970 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [804581829] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 00:32:13,970 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2140133713] [2022-11-22 00:32:13,970 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 00:32:13,970 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:32:13,971 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 [2022-11-22 00:32:13,972 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 00:32:13,974 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-11-22 00:32:14,731 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2022-11-22 00:32:14,731 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 00:32:14,738 INFO L263 TraceCheckSpWp]: Trace formula consists of 558 conjuncts, 96 conjunts are in the unsatisfiable core [2022-11-22 00:32:14,741 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 00:32:15,059 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:32:16,211 INFO L321 Elim1Store]: treesize reduction 34, result has 8.1 percent of original size [2022-11-22 00:32:16,212 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 29 treesize of output 13 [2022-11-22 00:32:16,257 INFO L134 CoverageAnalysis]: Checked inductivity of 212 backedges. 20 proven. 156 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-11-22 00:32:16,257 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 00:39:14,046 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-22 00:39:14,046 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 99 treesize of output 99 [2022-11-22 00:39:14,060 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 26 [2022-11-22 00:39:14,093 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-22 00:39:14,094 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 45 treesize of output 39 [2022-11-22 00:39:14,366 INFO L134 CoverageAnalysis]: Checked inductivity of 212 backedges. 20 proven. 156 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-11-22 00:39:14,366 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2140133713] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 00:39:14,366 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1450807352] [2022-11-22 00:39:14,367 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-11-22 00:39:14,367 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 00:39:14,368 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 00:39:14,368 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 00:39:14,368 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 00:39:14,399 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 00:39:14,402 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-22 00:39:14,435 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:39:14,472 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:39:14,498 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:39:14,544 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:39:14,585 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:39:14,608 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:39:14,668 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-22 00:39:14,669 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-22 00:39:15,307 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 00:39:20,129 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9798#(and (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc14#1.base|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_#t~nondet19#1| 2147483647) (<= 0 |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#t~post3#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_cstrncmp_~s2#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrncmp_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cstrncmp_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#in~s1#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrncmp_~s1#1.base|) (<= 0 (+ 2147483648 |ULTIMATE.start_main_#t~nondet19#1|)) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (< (select |#length| |ULTIMATE.start_cstrncmp_#t~post3#1.base|) (+ 1 |ULTIMATE.start_cstrncmp_#t~post3#1.offset|)) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrncmp_#in~n#1| 2147483647) (= |#NULL.offset| 0) (<= 0 (+ |ULTIMATE.start_cstrncmp_#in~n#1| 2147483648)) (<= 0 |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrncmp_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_cstrncmp_~s1#1.offset|) (= |ULTIMATE.start_main_#t~malloc14#1.offset| 0) (<= |ULTIMATE.start_cstrncmp_#in~s1#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrncmp_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-22 00:39:20,129 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 00:39:20,129 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 00:39:20,129 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 22, 23] total 54 [2022-11-22 00:39:20,129 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [981278480] [2022-11-22 00:39:20,130 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 00:39:20,130 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 54 states [2022-11-22 00:39:20,130 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 00:39:20,131 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2022-11-22 00:39:20,131 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=210, Invalid=4126, Unknown=220, NotChecked=0, Total=4556 [2022-11-22 00:39:20,132 INFO L87 Difference]: Start difference. First operand 75 states and 77 transitions. Second operand has 54 states, 54 states have (on average 3.185185185185185) internal successors, (172), 54 states have internal predecessors, (172), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:42:14,009 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 00:42:14,009 INFO L93 Difference]: Finished difference Result 231 states and 234 transitions. [2022-11-22 00:42:14,010 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 78 states. [2022-11-22 00:42:14,010 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 3.185185185185185) internal successors, (172), 54 states have internal predecessors, (172), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 74 [2022-11-22 00:42:14,011 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 00:42:14,011 INFO L225 Difference]: With dead ends: 231 [2022-11-22 00:42:14,011 INFO L226 Difference]: Without dead ends: 81 [2022-11-22 00:42:14,012 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 305 GetRequests, 172 SyntacticMatches, 2 SemanticMatches, 131 ConstructedPredicates, 0 IntricatePredicates, 2 DeprecatedPredicates, 4239 ImplicationChecksByTransitivity, 595.7s TimeCoverageRelationStatistics Valid=1096, Invalid=16139, Unknown=321, NotChecked=0, Total=17556 [2022-11-22 00:42:14,013 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 330 mSDsluCounter, 365 mSDsCounter, 0 mSdLazyCounter, 2290 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 330 SdHoareTripleChecker+Valid, 374 SdHoareTripleChecker+Invalid, 2325 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 2290 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2022-11-22 00:42:14,013 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [330 Valid, 374 Invalid, 2325 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 2290 Invalid, 0 Unknown, 0 Unchecked, 2.1s Time] [2022-11-22 00:42:14,014 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2022-11-22 00:42:14,015 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 79. [2022-11-22 00:42:14,015 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 78 states have (on average 1.0384615384615385) internal successors, (81), 78 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:42:14,016 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 81 transitions. [2022-11-22 00:42:14,016 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 81 transitions. Word has length 74 [2022-11-22 00:42:14,016 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 00:42:14,016 INFO L495 AbstractCegarLoop]: Abstraction has 79 states and 81 transitions. [2022-11-22 00:42:14,016 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 54 states, 54 states have (on average 3.185185185185185) internal successors, (172), 54 states have internal predecessors, (172), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:42:14,017 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 81 transitions. [2022-11-22 00:42:14,017 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2022-11-22 00:42:14,017 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:42:14,018 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 00:42:14,027 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Ended with exit code 0 [2022-11-22 00:42:14,226 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2022-11-22 00:42:14,227 INFO L420 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-22 00:42:14,227 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:42:14,227 INFO L85 PathProgramCache]: Analyzing trace with hash 899069111, now seen corresponding path program 12 times [2022-11-22 00:42:14,227 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:42:14,227 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [148837959] [2022-11-22 00:42:14,228 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:42:14,228 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:42:14,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:42:15,563 INFO L134 CoverageAnalysis]: Checked inductivity of 238 backedges. 25 proven. 164 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2022-11-22 00:42:15,563 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:42:15,563 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [148837959] [2022-11-22 00:42:15,563 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [148837959] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 00:42:15,563 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [776470688] [2022-11-22 00:42:15,563 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 00:42:15,564 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:42:15,564 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 [2022-11-22 00:42:15,571 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 00:42:15,581 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-11-22 00:42:16,308 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 00:42:16,308 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 00:42:16,315 INFO L263 TraceCheckSpWp]: Trace formula consists of 584 conjuncts, 79 conjunts are in the unsatisfiable core [2022-11-22 00:42:16,318 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 00:42:16,334 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-22 00:42:16,334 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2022-11-22 00:42:16,850 INFO L134 CoverageAnalysis]: Checked inductivity of 238 backedges. 36 proven. 153 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2022-11-22 00:42:16,850 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 00:42:17,929 INFO L134 CoverageAnalysis]: Checked inductivity of 238 backedges. 36 proven. 153 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2022-11-22 00:42:17,930 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [776470688] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 00:42:17,930 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1397151348] [2022-11-22 00:42:17,931 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-11-22 00:42:17,932 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 00:42:17,932 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 00:42:17,932 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 00:42:17,932 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 00:42:17,962 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 00:42:17,963 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-22 00:42:18,007 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:42:18,044 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:42:18,070 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:42:18,123 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:42:18,158 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:42:18,177 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:42:18,228 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-22 00:42:18,228 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-22 00:42:18,955 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 00:42:23,845 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10763#(and (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc14#1.base|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_#t~nondet19#1| 2147483647) (<= 0 |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#t~post3#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_cstrncmp_~s2#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrncmp_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cstrncmp_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#in~s1#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrncmp_~s1#1.base|) (<= 0 (+ 2147483648 |ULTIMATE.start_main_#t~nondet19#1|)) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (< (select |#length| |ULTIMATE.start_cstrncmp_#t~post3#1.base|) (+ 1 |ULTIMATE.start_cstrncmp_#t~post3#1.offset|)) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrncmp_#in~n#1| 2147483647) (= |#NULL.offset| 0) (<= 0 (+ |ULTIMATE.start_cstrncmp_#in~n#1| 2147483648)) (<= 0 |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrncmp_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_cstrncmp_~s1#1.offset|) (= |ULTIMATE.start_main_#t~malloc14#1.offset| 0) (<= |ULTIMATE.start_cstrncmp_#in~s1#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrncmp_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-22 00:42:23,845 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 00:42:23,845 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 00:42:23,845 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 48 [2022-11-22 00:42:23,845 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [664693297] [2022-11-22 00:42:23,845 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 00:42:23,846 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2022-11-22 00:42:23,846 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 00:42:23,847 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2022-11-22 00:42:23,847 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=383, Invalid=3523, Unknown=0, NotChecked=0, Total=3906 [2022-11-22 00:42:23,847 INFO L87 Difference]: Start difference. First operand 79 states and 81 transitions. Second operand has 49 states, 48 states have (on average 3.1875) internal successors, (153), 49 states have internal predecessors, (153), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:42:25,255 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 00:42:25,256 INFO L93 Difference]: Finished difference Result 86 states and 88 transitions. [2022-11-22 00:42:25,256 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-11-22 00:42:25,256 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 48 states have (on average 3.1875) internal successors, (153), 49 states have internal predecessors, (153), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 78 [2022-11-22 00:42:25,257 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 00:42:25,257 INFO L225 Difference]: With dead ends: 86 [2022-11-22 00:42:25,257 INFO L226 Difference]: Without dead ends: 86 [2022-11-22 00:42:25,258 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 269 GetRequests, 190 SyntacticMatches, 0 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1804 ImplicationChecksByTransitivity, 7.2s TimeCoverageRelationStatistics Valid=978, Invalid=5502, Unknown=0, NotChecked=0, Total=6480 [2022-11-22 00:42:25,259 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 416 mSDsluCounter, 166 mSDsCounter, 0 mSdLazyCounter, 693 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 416 SdHoareTripleChecker+Valid, 183 SdHoareTripleChecker+Invalid, 707 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 693 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-22 00:42:25,259 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [416 Valid, 183 Invalid, 707 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 693 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-22 00:42:25,259 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2022-11-22 00:42:25,261 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 85. [2022-11-22 00:42:25,261 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 84 states have (on average 1.0357142857142858) internal successors, (87), 84 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:42:25,262 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 87 transitions. [2022-11-22 00:42:25,262 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 87 transitions. Word has length 78 [2022-11-22 00:42:25,262 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 00:42:25,263 INFO L495 AbstractCegarLoop]: Abstraction has 85 states and 87 transitions. [2022-11-22 00:42:25,263 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 48 states have (on average 3.1875) internal successors, (153), 49 states have internal predecessors, (153), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:42:25,263 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 87 transitions. [2022-11-22 00:42:25,264 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2022-11-22 00:42:25,264 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:42:25,264 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 8, 8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 00:42:25,278 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2022-11-22 00:42:25,472 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2022-11-22 00:42:25,473 INFO L420 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-22 00:42:25,473 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:42:25,473 INFO L85 PathProgramCache]: Analyzing trace with hash 193399186, now seen corresponding path program 13 times [2022-11-22 00:42:25,473 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:42:25,473 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [252366957] [2022-11-22 00:42:25,474 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:42:25,474 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:42:25,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:42:27,105 INFO L134 CoverageAnalysis]: Checked inductivity of 282 backedges. 155 proven. 78 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2022-11-22 00:42:27,106 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:42:27,106 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [252366957] [2022-11-22 00:42:27,106 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [252366957] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 00:42:27,106 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2079986505] [2022-11-22 00:42:27,106 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 00:42:27,107 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:42:27,107 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 [2022-11-22 00:42:27,111 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 00:42:27,144 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2022-11-22 00:42:27,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:42:27,403 INFO L263 TraceCheckSpWp]: Trace formula consists of 626 conjuncts, 188 conjunts are in the unsatisfiable core [2022-11-22 00:42:27,405 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 00:42:28,208 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:42:30,543 INFO L321 Elim1Store]: treesize reduction 32, result has 8.6 percent of original size [2022-11-22 00:42:30,543 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 29 treesize of output 13 [2022-11-22 00:42:30,624 INFO L134 CoverageAnalysis]: Checked inductivity of 282 backedges. 23 proven. 259 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 00:42:30,624 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 00:42:32,841 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-22 00:42:32,842 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 99 treesize of output 99 [2022-11-22 00:42:32,881 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 26 [2022-11-22 00:42:32,901 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-22 00:42:32,901 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 45 treesize of output 37 [2022-11-22 00:42:34,063 INFO L134 CoverageAnalysis]: Checked inductivity of 282 backedges. 23 proven. 210 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2022-11-22 00:42:34,064 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2079986505] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 00:42:34,064 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1691808950] [2022-11-22 00:42:34,065 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-11-22 00:42:34,066 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 00:42:34,066 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 00:42:34,066 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 00:42:34,066 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 00:42:34,098 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 00:42:34,099 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-22 00:42:34,138 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:42:34,184 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:42:34,221 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:42:34,280 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-22 00:42:34,320 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:42:34,346 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:42:34,393 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-22 00:42:34,393 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-22 00:42:35,115 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 00:42:42,469 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11570#(and (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc14#1.base|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_#t~nondet19#1| 2147483647) (<= 0 |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#t~post3#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_cstrncmp_~s2#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrncmp_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cstrncmp_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#in~s1#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrncmp_~s1#1.base|) (<= 0 (+ 2147483648 |ULTIMATE.start_main_#t~nondet19#1|)) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (< (select |#length| |ULTIMATE.start_cstrncmp_#t~post3#1.base|) (+ 1 |ULTIMATE.start_cstrncmp_#t~post3#1.offset|)) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrncmp_#in~n#1| 2147483647) (= |#NULL.offset| 0) (<= 0 (+ |ULTIMATE.start_cstrncmp_#in~n#1| 2147483648)) (<= 0 |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrncmp_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_cstrncmp_~s1#1.offset|) (= |ULTIMATE.start_main_#t~malloc14#1.offset| 0) (<= |ULTIMATE.start_cstrncmp_#in~s1#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrncmp_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-22 00:42:42,469 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 00:42:42,469 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 00:42:42,470 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 38, 31] total 88 [2022-11-22 00:42:42,470 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1079130259] [2022-11-22 00:42:42,470 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 00:42:42,470 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 88 states [2022-11-22 00:42:42,470 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 00:42:42,471 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 88 interpolants. [2022-11-22 00:42:42,471 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=350, Invalid=9952, Unknown=0, NotChecked=0, Total=10302 [2022-11-22 00:42:42,472 INFO L87 Difference]: Start difference. First operand 85 states and 87 transitions. Second operand has 88 states, 88 states have (on average 2.534090909090909) internal successors, (223), 88 states have internal predecessors, (223), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:42:56,962 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 00:42:56,963 INFO L93 Difference]: Finished difference Result 261 states and 264 transitions. [2022-11-22 00:42:56,963 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 95 states. [2022-11-22 00:42:56,963 INFO L78 Accepts]: Start accepts. Automaton has has 88 states, 88 states have (on average 2.534090909090909) internal successors, (223), 88 states have internal predecessors, (223), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 84 [2022-11-22 00:42:56,964 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 00:42:56,964 INFO L225 Difference]: With dead ends: 261 [2022-11-22 00:42:56,964 INFO L226 Difference]: Without dead ends: 91 [2022-11-22 00:42:56,967 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 354 GetRequests, 172 SyntacticMatches, 0 SemanticMatches, 182 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7102 ImplicationChecksByTransitivity, 24.0s TimeCoverageRelationStatistics Valid=1659, Invalid=32013, Unknown=0, NotChecked=0, Total=33672 [2022-11-22 00:42:56,968 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 509 mSDsluCounter, 615 mSDsCounter, 0 mSdLazyCounter, 4597 mSolverCounterSat, 66 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 509 SdHoareTripleChecker+Valid, 625 SdHoareTripleChecker+Invalid, 4663 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 66 IncrementalHoareTripleChecker+Valid, 4597 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.7s IncrementalHoareTripleChecker+Time [2022-11-22 00:42:56,968 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [509 Valid, 625 Invalid, 4663 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [66 Valid, 4597 Invalid, 0 Unknown, 0 Unchecked, 3.7s Time] [2022-11-22 00:42:56,968 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2022-11-22 00:42:56,970 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 89. [2022-11-22 00:42:56,970 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 88 states have (on average 1.0340909090909092) internal successors, (91), 88 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:42:56,971 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 91 transitions. [2022-11-22 00:42:56,971 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 91 transitions. Word has length 84 [2022-11-22 00:42:56,971 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 00:42:56,972 INFO L495 AbstractCegarLoop]: Abstraction has 89 states and 91 transitions. [2022-11-22 00:42:56,972 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 88 states, 88 states have (on average 2.534090909090909) internal successors, (223), 88 states have internal predecessors, (223), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:42:56,972 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 91 transitions. [2022-11-22 00:42:56,973 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2022-11-22 00:42:56,973 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:42:56,973 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 00:42:56,983 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2022-11-22 00:42:57,181 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2022-11-22 00:42:57,182 INFO L420 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-22 00:42:57,182 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:42:57,182 INFO L85 PathProgramCache]: Analyzing trace with hash -1558207778, now seen corresponding path program 14 times [2022-11-22 00:42:57,182 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:42:57,182 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1011979094] [2022-11-22 00:42:57,182 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:42:57,183 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:42:57,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:42:58,546 INFO L134 CoverageAnalysis]: Checked inductivity of 312 backedges. 36 proven. 212 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2022-11-22 00:42:58,546 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:42:58,547 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1011979094] [2022-11-22 00:42:58,547 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1011979094] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 00:42:58,547 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [611840201] [2022-11-22 00:42:58,547 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 00:42:58,547 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:42:58,547 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 [2022-11-22 00:42:58,548 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 00:42:58,571 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2022-11-22 00:43:00,160 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2022-11-22 00:43:00,160 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 00:43:00,167 INFO L263 TraceCheckSpWp]: Trace formula consists of 652 conjuncts, 73 conjunts are in the unsatisfiable core [2022-11-22 00:43:00,170 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 00:43:00,914 INFO L134 CoverageAnalysis]: Checked inductivity of 312 backedges. 49 proven. 199 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2022-11-22 00:43:00,915 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 00:43:01,699 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2022-11-22 00:43:01,931 INFO L134 CoverageAnalysis]: Checked inductivity of 312 backedges. 49 proven. 199 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2022-11-22 00:43:01,931 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [611840201] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 00:43:01,931 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [883017044] [2022-11-22 00:43:01,932 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-11-22 00:43:01,932 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 00:43:01,932 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 00:43:01,932 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 00:43:01,933 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 00:43:01,971 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 00:43:01,972 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-22 00:43:02,022 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:43:02,064 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:43:02,089 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:43:02,147 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:43:02,185 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:43:02,211 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:43:02,259 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-22 00:43:02,259 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-22 00:43:02,964 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 00:43:07,967 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12674#(and (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc14#1.base|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_#t~nondet19#1| 2147483647) (<= 0 |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#t~post3#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_cstrncmp_~s2#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrncmp_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cstrncmp_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#in~s1#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrncmp_~s1#1.base|) (<= 0 (+ 2147483648 |ULTIMATE.start_main_#t~nondet19#1|)) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (< (select |#length| |ULTIMATE.start_cstrncmp_#t~post3#1.base|) (+ 1 |ULTIMATE.start_cstrncmp_#t~post3#1.offset|)) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrncmp_#in~n#1| 2147483647) (= |#NULL.offset| 0) (<= 0 (+ |ULTIMATE.start_cstrncmp_#in~n#1| 2147483648)) (<= 0 |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrncmp_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_cstrncmp_~s1#1.offset|) (= |ULTIMATE.start_main_#t~malloc14#1.offset| 0) (<= |ULTIMATE.start_cstrncmp_#in~s1#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrncmp_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-22 00:43:07,967 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 00:43:07,967 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 00:43:07,968 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 53 [2022-11-22 00:43:07,968 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1547512945] [2022-11-22 00:43:07,968 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 00:43:07,968 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 54 states [2022-11-22 00:43:07,968 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 00:43:07,969 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2022-11-22 00:43:07,969 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=502, Invalid=4054, Unknown=0, NotChecked=0, Total=4556 [2022-11-22 00:43:07,969 INFO L87 Difference]: Start difference. First operand 89 states and 91 transitions. Second operand has 54 states, 53 states have (on average 3.7735849056603774) internal successors, (200), 54 states have internal predecessors, (200), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:43:09,425 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 00:43:09,425 INFO L93 Difference]: Finished difference Result 96 states and 98 transitions. [2022-11-22 00:43:09,425 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2022-11-22 00:43:09,426 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 53 states have (on average 3.7735849056603774) internal successors, (200), 54 states have internal predecessors, (200), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 88 [2022-11-22 00:43:09,426 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 00:43:09,427 INFO L225 Difference]: With dead ends: 96 [2022-11-22 00:43:09,427 INFO L226 Difference]: Without dead ends: 96 [2022-11-22 00:43:09,427 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 303 GetRequests, 208 SyntacticMatches, 9 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2593 ImplicationChecksByTransitivity, 7.5s TimeCoverageRelationStatistics Valid=1161, Invalid=6495, Unknown=0, NotChecked=0, Total=7656 [2022-11-22 00:43:09,428 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 431 mSDsluCounter, 197 mSDsCounter, 0 mSdLazyCounter, 784 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 431 SdHoareTripleChecker+Valid, 218 SdHoareTripleChecker+Invalid, 816 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 784 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-22 00:43:09,428 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [431 Valid, 218 Invalid, 816 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 784 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-22 00:43:09,428 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2022-11-22 00:43:09,430 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 95. [2022-11-22 00:43:09,431 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 94 states have (on average 1.0319148936170213) internal successors, (97), 94 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:43:09,431 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 97 transitions. [2022-11-22 00:43:09,431 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 97 transitions. Word has length 88 [2022-11-22 00:43:09,432 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 00:43:09,432 INFO L495 AbstractCegarLoop]: Abstraction has 95 states and 97 transitions. [2022-11-22 00:43:09,432 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 54 states, 53 states have (on average 3.7735849056603774) internal successors, (200), 54 states have internal predecessors, (200), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:43:09,432 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 97 transitions. [2022-11-22 00:43:09,433 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2022-11-22 00:43:09,433 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:43:09,433 INFO L195 NwaCegarLoop]: trace histogram [10, 9, 9, 9, 9, 9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 00:43:09,451 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2022-11-22 00:43:09,651 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:43:09,651 INFO L420 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-22 00:43:09,651 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:43:09,652 INFO L85 PathProgramCache]: Analyzing trace with hash 1295548025, now seen corresponding path program 15 times [2022-11-22 00:43:09,652 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:43:09,652 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [8803113] [2022-11-22 00:43:09,652 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:43:09,652 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:43:09,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:43:11,762 INFO L134 CoverageAnalysis]: Checked inductivity of 362 backedges. 201 proven. 97 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2022-11-22 00:43:11,762 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:43:11,763 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [8803113] [2022-11-22 00:43:11,763 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [8803113] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 00:43:11,763 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [871820848] [2022-11-22 00:43:11,763 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 00:43:11,763 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:43:11,763 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 [2022-11-22 00:43:11,764 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 00:43:11,767 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2e43eb80-4d51-45cf-bab9-a8570a17ff57/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2022-11-22 00:43:12,333 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 00:43:12,333 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 00:43:12,342 INFO L263 TraceCheckSpWp]: Trace formula consists of 694 conjuncts, 191 conjunts are in the unsatisfiable core [2022-11-22 00:43:12,345 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 00:43:12,977 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:43:15,509 INFO L321 Elim1Store]: treesize reduction 32, result has 8.6 percent of original size [2022-11-22 00:43:15,509 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 29 treesize of output 13 [2022-11-22 00:43:15,590 INFO L134 CoverageAnalysis]: Checked inductivity of 362 backedges. 26 proven. 272 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2022-11-22 00:43:15,590 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 00:43:18,110 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-22 00:43:18,110 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 99 treesize of output 99 [2022-11-22 00:43:18,122 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 26 [2022-11-22 00:43:18,154 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-22 00:43:18,154 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 45 treesize of output 37 [2022-11-22 00:43:19,388 INFO L134 CoverageAnalysis]: Checked inductivity of 362 backedges. 26 proven. 272 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2022-11-22 00:43:19,389 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [871820848] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 00:43:19,389 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [158328136] [2022-11-22 00:43:19,390 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-11-22 00:43:19,391 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 00:43:19,391 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 00:43:19,391 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 00:43:19,391 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 00:43:19,425 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 00:43:19,428 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-22 00:43:19,464 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-22 00:43:19,532 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:43:19,588 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:43:19,642 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-22 00:43:19,711 INFO L321 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-11-22 00:43:19,712 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 84 treesize of output 83 [2022-11-22 00:43:19,772 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:43:19,795 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-22 00:43:19,840 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-22 00:43:19,840 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-22 00:43:20,504 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 00:43:27,447 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13566#(and (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc14#1.base|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_#t~nondet19#1| 2147483647) (<= 0 |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#t~post3#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_cstrncmp_~s2#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrncmp_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cstrncmp_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#in~s1#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrncmp_~s1#1.base|) (<= 0 (+ 2147483648 |ULTIMATE.start_main_#t~nondet19#1|)) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (< (select |#length| |ULTIMATE.start_cstrncmp_#t~post3#1.base|) (+ 1 |ULTIMATE.start_cstrncmp_#t~post3#1.offset|)) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrncmp_#in~n#1| 2147483647) (= |#NULL.offset| 0) (<= 0 (+ |ULTIMATE.start_cstrncmp_#in~n#1| 2147483648)) (<= 0 |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrncmp_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_cstrncmp_~s1#1.offset|) (= |ULTIMATE.start_main_#t~malloc14#1.offset| 0) (<= |ULTIMATE.start_cstrncmp_#in~s1#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrncmp_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-22 00:43:27,447 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 00:43:27,447 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 00:43:27,447 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 34, 34] total 89 [2022-11-22 00:43:27,447 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [814420890] [2022-11-22 00:43:27,448 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 00:43:27,448 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 89 states [2022-11-22 00:43:27,448 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 00:43:27,449 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 89 interpolants. [2022-11-22 00:43:27,449 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=358, Invalid=10148, Unknown=0, NotChecked=0, Total=10506 [2022-11-22 00:43:27,450 INFO L87 Difference]: Start difference. First operand 95 states and 97 transitions. Second operand has 89 states, 89 states have (on average 2.640449438202247) internal successors, (235), 89 states have internal predecessors, (235), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)