./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-examples/standard_strcmp_ground.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 38b53e6a 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_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-examples/standard_strcmp_ground.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash c802cbda9e8bed6a313e86b45d5d1f15426dd1417288149156d2bae000d97c78 --- 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-38b53e6 [2022-11-25 22:13:41,677 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-25 22:13:41,679 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-25 22:13:41,699 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-25 22:13:41,699 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-25 22:13:41,701 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-25 22:13:41,702 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-25 22:13:41,704 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-25 22:13:41,705 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-25 22:13:41,707 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-25 22:13:41,708 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-25 22:13:41,709 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-25 22:13:41,709 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-25 22:13:41,710 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-25 22:13:41,711 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-25 22:13:41,713 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-25 22:13:41,714 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-25 22:13:41,715 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-25 22:13:41,716 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-25 22:13:41,718 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-25 22:13:41,720 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-25 22:13:41,726 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-25 22:13:41,726 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-25 22:13:41,727 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-25 22:13:41,731 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-25 22:13:41,731 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-25 22:13:41,731 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-25 22:13:41,732 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-25 22:13:41,733 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-25 22:13:41,734 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-25 22:13:41,734 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-25 22:13:41,735 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-25 22:13:41,736 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-25 22:13:41,737 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-25 22:13:41,738 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-25 22:13:41,738 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-25 22:13:41,739 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-25 22:13:41,739 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-25 22:13:41,739 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-25 22:13:41,743 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-25 22:13:41,745 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-25 22:13:41,746 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-25 22:13:41,785 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-25 22:13:41,785 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-25 22:13:41,786 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-25 22:13:41,786 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-25 22:13:41,787 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-25 22:13:41,787 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-25 22:13:41,788 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-25 22:13:41,788 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-25 22:13:41,788 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-25 22:13:41,788 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-25 22:13:41,789 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-25 22:13:41,790 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-25 22:13:41,790 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-25 22:13:41,790 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-25 22:13:41,790 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-25 22:13:41,790 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-25 22:13:41,791 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-25 22:13:41,791 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-25 22:13:41,791 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-25 22:13:41,792 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-25 22:13:41,792 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-25 22:13:41,792 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-25 22:13:41,792 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-25 22:13:41,792 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-25 22:13:41,793 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-25 22:13:41,793 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-25 22:13:41,793 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-25 22:13:41,793 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-25 22:13:41,794 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-25 22:13:41,794 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-25 22:13:41,794 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-25 22:13:41,795 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-25 22:13:41,795 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-25 22:13:41,795 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-25 22:13:41,795 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-25 22:13:41,795 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-25 22:13:41,796 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-25 22:13:41,796 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-25 22:13:41,796 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-25 22:13:41,796 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-25 22:13:41,796 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-25 22:13:41,796 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_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> c802cbda9e8bed6a313e86b45d5d1f15426dd1417288149156d2bae000d97c78 [2022-11-25 22:13:42,105 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-25 22:13:42,141 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-25 22:13:42,144 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-25 22:13:42,145 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-25 22:13:42,146 INFO L275 PluginConnector]: CDTParser initialized [2022-11-25 22:13:42,147 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/../../sv-benchmarks/c/array-examples/standard_strcmp_ground.i [2022-11-25 22:13:45,351 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-25 22:13:45,597 INFO L351 CDTParser]: Found 1 translation units. [2022-11-25 22:13:45,597 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/sv-benchmarks/c/array-examples/standard_strcmp_ground.i [2022-11-25 22:13:45,602 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/data/692aaacad/500c4b12eb614b979359be55ce134398/FLAG000897796 [2022-11-25 22:13:45,615 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/data/692aaacad/500c4b12eb614b979359be55ce134398 [2022-11-25 22:13:45,618 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-25 22:13:45,619 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-25 22:13:45,621 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-25 22:13:45,621 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-25 22:13:45,625 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-25 22:13:45,626 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 10:13:45" (1/1) ... [2022-11-25 22:13:45,627 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5bec935c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 10:13:45, skipping insertion in model container [2022-11-25 22:13:45,627 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 10:13:45" (1/1) ... [2022-11-25 22:13:45,635 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-25 22:13:45,650 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-25 22:13:45,783 WARN L237 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/sv-benchmarks/c/array-examples/standard_strcmp_ground.i[815,828] [2022-11-25 22:13:45,800 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-25 22:13:45,808 INFO L203 MainTranslator]: Completed pre-run [2022-11-25 22:13:45,820 WARN L237 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/sv-benchmarks/c/array-examples/standard_strcmp_ground.i[815,828] [2022-11-25 22:13:45,827 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-25 22:13:45,839 INFO L208 MainTranslator]: Completed translation [2022-11-25 22:13:45,839 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 10:13:45 WrapperNode [2022-11-25 22:13:45,839 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-25 22:13:45,840 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-25 22:13:45,841 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-25 22:13:45,841 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-25 22:13:45,848 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 10:13:45" (1/1) ... [2022-11-25 22:13:45,855 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 10:13:45" (1/1) ... [2022-11-25 22:13:45,874 INFO L138 Inliner]: procedures = 17, calls = 20, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 78 [2022-11-25 22:13:45,874 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-25 22:13:45,875 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-25 22:13:45,875 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-25 22:13:45,875 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-25 22:13:45,883 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 10:13:45" (1/1) ... [2022-11-25 22:13:45,883 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 10:13:45" (1/1) ... [2022-11-25 22:13:45,885 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 10:13:45" (1/1) ... [2022-11-25 22:13:45,885 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 10:13:45" (1/1) ... [2022-11-25 22:13:45,890 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 10:13:45" (1/1) ... [2022-11-25 22:13:45,894 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 10:13:45" (1/1) ... [2022-11-25 22:13:45,895 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 10:13:45" (1/1) ... [2022-11-25 22:13:45,896 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 10:13:45" (1/1) ... [2022-11-25 22:13:45,898 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-25 22:13:45,899 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-25 22:13:45,899 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-25 22:13:45,899 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-25 22:13:45,900 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 10:13:45" (1/1) ... [2022-11-25 22:13:45,919 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-25 22:13:45,931 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 22:13:45,950 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-25 22:13:45,956 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-25 22:13:45,995 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-25 22:13:45,996 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-25 22:13:45,996 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-11-25 22:13:45,996 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-11-25 22:13:45,997 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-25 22:13:45,997 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-25 22:13:45,997 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-11-25 22:13:45,997 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-11-25 22:13:46,126 INFO L235 CfgBuilder]: Building ICFG [2022-11-25 22:13:46,128 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-25 22:13:46,399 INFO L276 CfgBuilder]: Performing block encoding [2022-11-25 22:13:46,432 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-25 22:13:46,432 INFO L300 CfgBuilder]: Removed 3 assume(true) statements. [2022-11-25 22:13:46,435 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 10:13:46 BoogieIcfgContainer [2022-11-25 22:13:46,435 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-25 22:13:46,438 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-25 22:13:46,438 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-25 22:13:46,441 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-25 22:13:46,442 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 10:13:45" (1/3) ... [2022-11-25 22:13:46,442 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@618c61c9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 10:13:46, skipping insertion in model container [2022-11-25 22:13:46,443 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 10:13:45" (2/3) ... [2022-11-25 22:13:46,443 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@618c61c9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 10:13:46, skipping insertion in model container [2022-11-25 22:13:46,443 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 10:13:46" (3/3) ... [2022-11-25 22:13:46,445 INFO L112 eAbstractionObserver]: Analyzing ICFG standard_strcmp_ground.i [2022-11-25 22:13:46,464 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-25 22:13:46,464 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-25 22:13:46,532 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-25 22:13:46,539 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@49549a7e, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-25 22:13:46,540 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-25 22:13:46,545 INFO L276 IsEmpty]: Start isEmpty. Operand has 13 states, 11 states have (on average 1.6363636363636365) internal successors, (18), 12 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) [2022-11-25 22:13:46,552 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2022-11-25 22:13:46,553 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 22:13:46,553 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 22:13:46,554 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 22:13:46,562 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 22:13:46,562 INFO L85 PathProgramCache]: Analyzing trace with hash -715237656, now seen corresponding path program 1 times [2022-11-25 22:13:46,573 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 22:13:46,574 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [166486157] [2022-11-25 22:13:46,574 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 22:13:46,575 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 22:13:46,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:13:46,843 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 22:13:46,844 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 22:13:46,844 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [166486157] [2022-11-25 22:13:46,845 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [166486157] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 22:13:46,845 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-25 22:13:46,846 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-25 22:13:46,847 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1384432549] [2022-11-25 22:13:46,849 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 22:13:46,855 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-25 22:13:46,856 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 22:13:46,906 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-25 22:13:46,907 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-25 22:13:46,910 INFO L87 Difference]: Start difference. First operand has 13 states, 11 states have (on average 1.6363636363636365) internal successors, (18), 12 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) Second operand has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 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) [2022-11-25 22:13:46,968 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 22:13:46,968 INFO L93 Difference]: Finished difference Result 25 states and 35 transitions. [2022-11-25 22:13:47,005 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-25 22:13:47,007 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 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 [2022-11-25 22:13:47,007 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 22:13:47,016 INFO L225 Difference]: With dead ends: 25 [2022-11-25 22:13:47,017 INFO L226 Difference]: Without dead ends: 12 [2022-11-25 22:13:47,019 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-25 22:13:47,023 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 0 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-25 22:13:47,024 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 20 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-25 22:13:47,053 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2022-11-25 22:13:47,064 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2022-11-25 22:13:47,065 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 11 states have (on average 1.3636363636363635) internal successors, (15), 11 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) [2022-11-25 22:13:47,066 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 15 transitions. [2022-11-25 22:13:47,075 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 15 transitions. Word has length 8 [2022-11-25 22:13:47,076 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 22:13:47,077 INFO L495 AbstractCegarLoop]: Abstraction has 12 states and 15 transitions. [2022-11-25 22:13:47,078 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 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) [2022-11-25 22:13:47,078 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 15 transitions. [2022-11-25 22:13:47,079 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-11-25 22:13:47,080 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 22:13:47,080 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 22:13:47,080 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-25 22:13:47,081 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 22:13:47,082 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 22:13:47,082 INFO L85 PathProgramCache]: Analyzing trace with hash 352703344, now seen corresponding path program 1 times [2022-11-25 22:13:47,082 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 22:13:47,082 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1250980937] [2022-11-25 22:13:47,083 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 22:13:47,083 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 22:13:47,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:13:47,208 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 22:13:47,208 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 22:13:47,208 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1250980937] [2022-11-25 22:13:47,208 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1250980937] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 22:13:47,209 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [227577082] [2022-11-25 22:13:47,209 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 22:13:47,209 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:13:47,209 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 22:13:47,213 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 22:13:47,224 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-25 22:13:47,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:13:47,297 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-25 22:13:47,301 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 22:13:47,317 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-25 22:13:47,318 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-25 22:13:47,318 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [227577082] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 22:13:47,318 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-25 22:13:47,319 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3] total 5 [2022-11-25 22:13:47,320 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1997584808] [2022-11-25 22:13:47,320 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 22:13:47,320 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-25 22:13:47,321 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 22:13:47,321 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-25 22:13:47,322 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-11-25 22:13:47,322 INFO L87 Difference]: Start difference. First operand 12 states and 15 transitions. Second operand has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 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) [2022-11-25 22:13:47,344 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 22:13:47,344 INFO L93 Difference]: Finished difference Result 28 states and 33 transitions. [2022-11-25 22:13:47,345 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-25 22:13:47,345 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 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 9 [2022-11-25 22:13:47,346 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 22:13:47,346 INFO L225 Difference]: With dead ends: 28 [2022-11-25 22:13:47,346 INFO L226 Difference]: Without dead ends: 21 [2022-11-25 22:13:47,347 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-11-25 22:13:47,348 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 9 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 14 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-25 22:13:47,349 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 14 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-25 22:13:47,350 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2022-11-25 22:13:47,352 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 13. [2022-11-25 22:13:47,353 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 12 states have (on average 1.3333333333333333) internal successors, (16), 12 states have internal predecessors, (16), 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) [2022-11-25 22:13:47,353 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 16 transitions. [2022-11-25 22:13:47,354 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 16 transitions. Word has length 9 [2022-11-25 22:13:47,354 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 22:13:47,354 INFO L495 AbstractCegarLoop]: Abstraction has 13 states and 16 transitions. [2022-11-25 22:13:47,355 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 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) [2022-11-25 22:13:47,355 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 16 transitions. [2022-11-25 22:13:47,355 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-11-25 22:13:47,355 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 22:13:47,356 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 22:13:47,368 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-25 22:13:47,561 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:13:47,562 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 22:13:47,563 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 22:13:47,563 INFO L85 PathProgramCache]: Analyzing trace with hash -201190691, now seen corresponding path program 1 times [2022-11-25 22:13:47,563 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 22:13:47,563 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1254919719] [2022-11-25 22:13:47,564 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 22:13:47,564 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 22:13:47,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:13:47,680 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 22:13:47,680 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 22:13:47,680 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1254919719] [2022-11-25 22:13:47,681 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1254919719] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 22:13:47,681 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [222212900] [2022-11-25 22:13:47,681 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 22:13:47,681 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:13:47,681 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 22:13:47,684 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 22:13:47,694 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-25 22:13:47,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:13:47,783 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 3 conjunts are in the unsatisfiable core [2022-11-25 22:13:47,784 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 22:13:47,820 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 22:13:47,820 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 22:13:47,852 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 22:13:47,852 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [222212900] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 22:13:47,853 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [593721399] [2022-11-25 22:13:47,883 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-25 22:13:47,883 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 22:13:47,887 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 22:13:47,892 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 22:13:47,893 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 22:13:47,968 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:13:47,971 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:13:48,047 INFO L321 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2022-11-25 22:13:48,049 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 53 [2022-11-25 22:13:48,074 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:13:48,075 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:13:48,077 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 8 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 27 [2022-11-25 22:13:48,155 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:13:48,156 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:13:48,162 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 8 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 35 [2022-11-25 22:13:48,375 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:13:48,378 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:13:48,383 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:13:48,384 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:13:48,385 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:13:48,478 INFO L321 Elim1Store]: treesize reduction 235, result has 16.4 percent of original size [2022-11-25 22:13:48,480 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 9 case distinctions, treesize of input 284 treesize of output 274 [2022-11-25 22:13:49,059 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:13:49,073 INFO L321 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2022-11-25 22:13:49,074 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 1 case distinctions, treesize of input 42 treesize of output 29 [2022-11-25 22:13:49,118 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 22:13:49,415 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [593721399] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 22:13:49,415 INFO L184 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2022-11-25 22:13:49,415 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [3, 3, 3] total 11 [2022-11-25 22:13:49,416 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1173126612] [2022-11-25 22:13:49,416 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 22:13:49,417 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-25 22:13:49,417 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 22:13:49,417 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-25 22:13:49,418 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=93, Unknown=0, NotChecked=0, Total=132 [2022-11-25 22:13:49,418 INFO L87 Difference]: Start difference. First operand 13 states and 16 transitions. Second operand has 7 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 6 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) [2022-11-25 22:13:49,490 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 22:13:49,490 INFO L93 Difference]: Finished difference Result 21 states and 25 transitions. [2022-11-25 22:13:49,490 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-25 22:13:49,491 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 6 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 [2022-11-25 22:13:49,491 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 22:13:49,491 INFO L225 Difference]: With dead ends: 21 [2022-11-25 22:13:49,492 INFO L226 Difference]: Without dead ends: 14 [2022-11-25 22:13:49,492 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=39, Invalid=93, Unknown=0, NotChecked=0, Total=132 [2022-11-25 22:13:49,493 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 12 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 38 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 22:13:49,494 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 18 Invalid, 38 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 38 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 22:13:49,495 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2022-11-25 22:13:49,498 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2022-11-25 22:13:49,498 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 13 states have (on average 1.3076923076923077) internal successors, (17), 13 states have internal predecessors, (17), 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) [2022-11-25 22:13:49,499 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 17 transitions. [2022-11-25 22:13:49,499 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 17 transitions. Word has length 10 [2022-11-25 22:13:49,499 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 22:13:49,500 INFO L495 AbstractCegarLoop]: Abstraction has 14 states and 17 transitions. [2022-11-25 22:13:49,500 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 6 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) [2022-11-25 22:13:49,500 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 17 transitions. [2022-11-25 22:13:49,500 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-11-25 22:13:49,501 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 22:13:49,501 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 22:13:49,507 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-25 22:13:49,707 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:13:49,707 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 22:13:49,707 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 22:13:49,707 INFO L85 PathProgramCache]: Analyzing trace with hash 975217493, now seen corresponding path program 1 times [2022-11-25 22:13:49,708 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 22:13:49,708 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1885598200] [2022-11-25 22:13:49,708 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 22:13:49,708 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 22:13:49,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:13:49,829 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-25 22:13:49,829 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 22:13:49,829 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1885598200] [2022-11-25 22:13:49,829 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1885598200] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 22:13:49,830 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [154239444] [2022-11-25 22:13:49,830 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 22:13:49,830 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:13:49,830 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 22:13:49,836 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 22:13:49,844 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-25 22:13:49,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:13:49,910 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 3 conjunts are in the unsatisfiable core [2022-11-25 22:13:49,911 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 22:13:49,925 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-25 22:13:49,926 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 22:13:49,945 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-25 22:13:49,946 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [154239444] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 22:13:49,951 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [295603130] [2022-11-25 22:13:49,954 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-25 22:13:49,955 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 22:13:49,955 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 22:13:49,955 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 22:13:49,956 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 22:13:49,988 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:13:49,989 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:13:50,025 INFO L321 Elim1Store]: treesize reduction 37, result has 32.7 percent of original size [2022-11-25 22:13:50,026 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 34 [2022-11-25 22:13:50,055 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:13:50,057 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:13:50,103 INFO L321 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2022-11-25 22:13:50,104 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 53 [2022-11-25 22:13:50,146 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:13:50,147 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:13:50,150 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 8 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 57 treesize of output 45 [2022-11-25 22:13:50,245 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:13:50,247 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:13:50,249 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:13:50,254 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:13:50,256 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:13:50,260 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:13:50,261 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:13:50,301 INFO L321 Elim1Store]: treesize reduction 135, result has 12.9 percent of original size [2022-11-25 22:13:50,302 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 304 treesize of output 272 [2022-11-25 22:13:50,389 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:13:50,402 INFO L321 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2022-11-25 22:13:50,404 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 1 case distinctions, treesize of input 42 treesize of output 29 [2022-11-25 22:13:50,624 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 22:13:51,393 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '339#(and (= |ULTIMATE.start__strcmp_#res#1| 0) (<= 0 |ULTIMATE.start__strcmp_#in~dst#1.offset|) (<= 0 |ULTIMATE.start__strcmp_~dst#1.base|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (= |ULTIMATE.start_main_~#b~0#1.offset| 0) (<= 0 |ULTIMATE.start__strcmp_~src#1.base|) (<= |ULTIMATE.start__strcmp_~src#1.offset| 0) (= |ULTIMATE.start_main_~c~0#1| |ULTIMATE.start__strcmp_#res#1|) (<= 0 |ULTIMATE.start__strcmp_#in~src#1.offset|) (<= 0 |ULTIMATE.start__strcmp_~dst#1.offset|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~x~0#1| 4))) |ULTIMATE.start_main_#t~mem8#1|) (<= 0 |ULTIMATE.start__strcmp_#in~src#1.base|) (<= 0 |ULTIMATE.start__strcmp_~src#1.offset|) (<= |ULTIMATE.start__strcmp_#in~dst#1.offset| 0) (<= |ULTIMATE.start__strcmp_#in~src#1.offset| 0) (<= |ULTIMATE.start__strcmp_~dst#1.offset| 0) (= |ULTIMATE.start_main_#t~mem9#1| (select (select |#memory_int| |ULTIMATE.start_main_~#b~0#1.base|) (+ |ULTIMATE.start_main_~#b~0#1.offset| (* |ULTIMATE.start_main_~x~0#1| 4)))) (<= 0 |ULTIMATE.start__strcmp_#in~dst#1.base|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_~x~0#1| 0) (<= 100000 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_main_~#b~0#1.base|) (<= 0 |#StackHeapBarrier|) (= (ite (= |ULTIMATE.start_main_#t~mem9#1| |ULTIMATE.start_main_#t~mem8#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 100000 |ULTIMATE.start__strcmp_~i~0#1|) (= |#NULL.base| 0))' at error location [2022-11-25 22:13:51,394 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 22:13:51,394 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 22:13:51,394 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2022-11-25 22:13:51,394 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [561105202] [2022-11-25 22:13:51,394 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 22:13:51,395 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-25 22:13:51,395 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 22:13:51,395 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-25 22:13:51,396 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=126, Unknown=0, NotChecked=0, Total=182 [2022-11-25 22:13:51,396 INFO L87 Difference]: Start difference. First operand 14 states and 17 transitions. Second operand has 7 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 6 states have internal predecessors, (16), 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) [2022-11-25 22:13:51,428 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 22:13:51,428 INFO L93 Difference]: Finished difference Result 28 states and 36 transitions. [2022-11-25 22:13:51,428 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-25 22:13:51,429 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 6 states have internal predecessors, (16), 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 [2022-11-25 22:13:51,429 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 22:13:51,429 INFO L225 Difference]: With dead ends: 28 [2022-11-25 22:13:51,429 INFO L226 Difference]: Without dead ends: 17 [2022-11-25 22:13:51,430 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 21 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=56, Invalid=126, Unknown=0, NotChecked=0, Total=182 [2022-11-25 22:13:51,431 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 0 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 27 SdHoareTripleChecker+Invalid, 17 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-25 22:13:51,431 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 27 Invalid, 17 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 16 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-25 22:13:51,432 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2022-11-25 22:13:51,435 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2022-11-25 22:13:51,436 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 16 states have (on average 1.25) internal successors, (20), 16 states have internal predecessors, (20), 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) [2022-11-25 22:13:51,436 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 20 transitions. [2022-11-25 22:13:51,436 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 20 transitions. Word has length 11 [2022-11-25 22:13:51,436 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 22:13:51,437 INFO L495 AbstractCegarLoop]: Abstraction has 17 states and 20 transitions. [2022-11-25 22:13:51,437 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 6 states have internal predecessors, (16), 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) [2022-11-25 22:13:51,437 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 20 transitions. [2022-11-25 22:13:51,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-11-25 22:13:51,438 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 22:13:51,438 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 22:13:51,447 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2022-11-25 22:13:51,644 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:13:51,644 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 22:13:51,644 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 22:13:51,645 INFO L85 PathProgramCache]: Analyzing trace with hash -1636529459, now seen corresponding path program 2 times [2022-11-25 22:13:51,645 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 22:13:51,645 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1627199564] [2022-11-25 22:13:51,645 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 22:13:51,645 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 22:13:51,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:13:51,742 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-25 22:13:51,742 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 22:13:51,742 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1627199564] [2022-11-25 22:13:51,742 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1627199564] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 22:13:51,742 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [782308119] [2022-11-25 22:13:51,743 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 22:13:51,743 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:13:51,743 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 22:13:51,750 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 22:13:51,754 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-25 22:13:51,824 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-11-25 22:13:51,825 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 22:13:51,826 INFO L263 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 3 conjunts are in the unsatisfiable core [2022-11-25 22:13:51,827 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 22:13:51,838 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-25 22:13:51,839 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 22:13:51,855 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-25 22:13:51,856 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [782308119] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 22:13:51,856 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [467596133] [2022-11-25 22:13:51,863 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-25 22:13:51,864 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 22:13:51,864 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 22:13:51,864 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 22:13:51,864 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 22:13:51,894 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:13:51,895 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:13:51,927 INFO L321 Elim1Store]: treesize reduction 37, result has 32.7 percent of original size [2022-11-25 22:13:51,927 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 34 [2022-11-25 22:13:51,943 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:13:51,945 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:13:51,987 INFO L321 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2022-11-25 22:13:51,988 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 53 [2022-11-25 22:13:52,020 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:13:52,021 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:13:52,024 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 8 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 57 treesize of output 45 [2022-11-25 22:13:52,099 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:13:52,100 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:13:52,102 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:13:52,103 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:13:52,104 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:13:52,107 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:13:52,108 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:13:52,151 INFO L321 Elim1Store]: treesize reduction 135, result has 12.9 percent of original size [2022-11-25 22:13:52,152 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 304 treesize of output 272 [2022-11-25 22:13:52,218 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:13:52,229 INFO L321 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2022-11-25 22:13:52,231 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 1 case distinctions, treesize of input 42 treesize of output 29 [2022-11-25 22:13:52,398 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 22:13:53,153 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '498#(and (= |ULTIMATE.start__strcmp_#res#1| 0) (<= 0 |ULTIMATE.start__strcmp_#in~dst#1.offset|) (<= 0 |ULTIMATE.start__strcmp_~dst#1.base|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (= |ULTIMATE.start_main_~#b~0#1.offset| 0) (<= 0 |ULTIMATE.start__strcmp_~src#1.base|) (<= |ULTIMATE.start__strcmp_~src#1.offset| 0) (= |ULTIMATE.start_main_~c~0#1| |ULTIMATE.start__strcmp_#res#1|) (<= 0 |ULTIMATE.start__strcmp_#in~src#1.offset|) (<= 0 |ULTIMATE.start__strcmp_~dst#1.offset|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~x~0#1| 4))) |ULTIMATE.start_main_#t~mem8#1|) (<= 0 |ULTIMATE.start__strcmp_#in~src#1.base|) (<= 0 |ULTIMATE.start__strcmp_~src#1.offset|) (<= |ULTIMATE.start__strcmp_#in~dst#1.offset| 0) (<= |ULTIMATE.start__strcmp_#in~src#1.offset| 0) (<= |ULTIMATE.start__strcmp_~dst#1.offset| 0) (= |ULTIMATE.start_main_#t~mem9#1| (select (select |#memory_int| |ULTIMATE.start_main_~#b~0#1.base|) (+ |ULTIMATE.start_main_~#b~0#1.offset| (* |ULTIMATE.start_main_~x~0#1| 4)))) (<= 0 |ULTIMATE.start__strcmp_#in~dst#1.base|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_~x~0#1| 0) (<= 100000 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_main_~#b~0#1.base|) (<= 0 |#StackHeapBarrier|) (= (ite (= |ULTIMATE.start_main_#t~mem9#1| |ULTIMATE.start_main_#t~mem8#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 100000 |ULTIMATE.start__strcmp_~i~0#1|) (= |#NULL.base| 0))' at error location [2022-11-25 22:13:53,153 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 22:13:53,153 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 22:13:53,153 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2022-11-25 22:13:53,153 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1185720905] [2022-11-25 22:13:53,153 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 22:13:53,154 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-25 22:13:53,154 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 22:13:53,154 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-25 22:13:53,155 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=126, Unknown=0, NotChecked=0, Total=182 [2022-11-25 22:13:53,155 INFO L87 Difference]: Start difference. First operand 17 states and 20 transitions. Second operand has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 7 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) [2022-11-25 22:13:53,203 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 22:13:53,203 INFO L93 Difference]: Finished difference Result 50 states and 58 transitions. [2022-11-25 22:13:53,204 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-25 22:13:53,204 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 7 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 14 [2022-11-25 22:13:53,204 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 22:13:53,205 INFO L225 Difference]: With dead ends: 50 [2022-11-25 22:13:53,206 INFO L226 Difference]: Without dead ends: 43 [2022-11-25 22:13:53,206 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 31 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=56, Invalid=126, Unknown=0, NotChecked=0, Total=182 [2022-11-25 22:13:53,208 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 50 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 26 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-25 22:13:53,209 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [50 Valid, 34 Invalid, 26 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-25 22:13:53,211 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2022-11-25 22:13:53,222 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 22. [2022-11-25 22:13:53,222 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 21 states have (on average 1.2857142857142858) internal successors, (27), 21 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) [2022-11-25 22:13:53,225 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 27 transitions. [2022-11-25 22:13:53,225 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 27 transitions. Word has length 14 [2022-11-25 22:13:53,225 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 22:13:53,226 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 27 transitions. [2022-11-25 22:13:53,226 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 7 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) [2022-11-25 22:13:53,226 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 27 transitions. [2022-11-25 22:13:53,228 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-11-25 22:13:53,228 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 22:13:53,228 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 22:13:53,234 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-25 22:13:53,434 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:13:53,434 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 22:13:53,435 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 22:13:53,435 INFO L85 PathProgramCache]: Analyzing trace with hash -1737865440, now seen corresponding path program 1 times [2022-11-25 22:13:53,435 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 22:13:53,435 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2132298128] [2022-11-25 22:13:53,435 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 22:13:53,435 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 22:13:53,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:13:53,501 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-25 22:13:53,502 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 22:13:53,502 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2132298128] [2022-11-25 22:13:53,502 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2132298128] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 22:13:53,502 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-25 22:13:53,502 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-25 22:13:53,503 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1293556198] [2022-11-25 22:13:53,503 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 22:13:53,503 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-25 22:13:53,503 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 22:13:53,504 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-25 22:13:53,504 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-25 22:13:53,504 INFO L87 Difference]: Start difference. First operand 22 states and 27 transitions. Second operand has 4 states, 4 states have (on average 2.75) 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) [2022-11-25 22:13:53,528 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 22:13:53,528 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2022-11-25 22:13:53,528 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-25 22:13:53,529 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.75) 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 15 [2022-11-25 22:13:53,529 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 22:13:53,529 INFO L225 Difference]: With dead ends: 29 [2022-11-25 22:13:53,529 INFO L226 Difference]: Without dead ends: 22 [2022-11-25 22:13:53,530 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 [2022-11-25 22:13:53,531 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 1 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 22 SdHoareTripleChecker+Invalid, 19 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-25 22:13:53,531 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 22 Invalid, 19 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-25 22:13:53,532 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2022-11-25 22:13:53,536 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2022-11-25 22:13:53,536 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 21 states have (on average 1.1428571428571428) internal successors, (24), 21 states have internal predecessors, (24), 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) [2022-11-25 22:13:53,537 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2022-11-25 22:13:53,537 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 15 [2022-11-25 22:13:53,537 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 22:13:53,537 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2022-11-25 22:13:53,537 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.75) 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) [2022-11-25 22:13:53,537 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2022-11-25 22:13:53,538 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-11-25 22:13:53,538 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 22:13:53,538 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 22:13:53,538 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2022-11-25 22:13:53,539 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 22:13:53,539 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 22:13:53,539 INFO L85 PathProgramCache]: Analyzing trace with hash 141189372, now seen corresponding path program 3 times [2022-11-25 22:13:53,539 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 22:13:53,539 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2113350589] [2022-11-25 22:13:53,540 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 22:13:53,540 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 22:13:53,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:13:53,640 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-11-25 22:13:53,640 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 22:13:53,640 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2113350589] [2022-11-25 22:13:53,641 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2113350589] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 22:13:53,641 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1677374627] [2022-11-25 22:13:53,641 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 22:13:53,641 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:13:53,641 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 22:13:53,642 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 22:13:53,656 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-25 22:13:53,735 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 22:13:53,735 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 22:13:53,737 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 6 conjunts are in the unsatisfiable core [2022-11-25 22:13:53,740 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 22:13:53,792 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-25 22:13:53,792 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 22:13:53,864 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-25 22:13:53,864 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1677374627] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 22:13:53,864 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [990417832] [2022-11-25 22:13:53,867 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-25 22:13:53,867 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 22:13:53,867 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 22:13:53,868 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 22:13:53,868 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 22:13:53,886 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:13:53,888 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:13:53,925 INFO L321 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2022-11-25 22:13:53,925 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 53 [2022-11-25 22:13:53,938 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:13:53,940 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:13:53,942 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 8 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 27 [2022-11-25 22:13:53,968 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:13:53,969 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:13:53,973 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 8 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 57 treesize of output 45 [2022-11-25 22:13:54,046 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:13:54,047 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:13:54,049 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:13:54,051 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:13:54,055 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:13:54,061 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:13:54,071 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:13:54,107 INFO L321 Elim1Store]: treesize reduction 135, result has 12.9 percent of original size [2022-11-25 22:13:54,108 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 304 treesize of output 272 [2022-11-25 22:13:54,179 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:13:54,190 INFO L321 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2022-11-25 22:13:54,190 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 1 case distinctions, treesize of input 42 treesize of output 29 [2022-11-25 22:13:54,336 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 22:13:55,223 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '823#(and (= |ULTIMATE.start__strcmp_#res#1| 0) (<= 0 |ULTIMATE.start__strcmp_#in~dst#1.offset|) (<= 0 |ULTIMATE.start__strcmp_~dst#1.base|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (= |ULTIMATE.start_main_~#b~0#1.offset| 0) (<= 0 |ULTIMATE.start__strcmp_~src#1.base|) (<= |ULTIMATE.start__strcmp_~src#1.offset| 0) (= |ULTIMATE.start_main_~c~0#1| |ULTIMATE.start__strcmp_#res#1|) (<= 0 |ULTIMATE.start__strcmp_#in~src#1.offset|) (<= 0 |ULTIMATE.start__strcmp_~dst#1.offset|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~x~0#1| 4))) |ULTIMATE.start_main_#t~mem8#1|) (<= 0 |ULTIMATE.start__strcmp_#in~src#1.base|) (<= 0 |ULTIMATE.start__strcmp_~src#1.offset|) (<= |ULTIMATE.start__strcmp_#in~dst#1.offset| 0) (<= |ULTIMATE.start__strcmp_#in~src#1.offset| 0) (<= |ULTIMATE.start__strcmp_~dst#1.offset| 0) (= |ULTIMATE.start_main_#t~mem9#1| (select (select |#memory_int| |ULTIMATE.start_main_~#b~0#1.base|) (+ |ULTIMATE.start_main_~#b~0#1.offset| (* |ULTIMATE.start_main_~x~0#1| 4)))) (<= 0 |ULTIMATE.start__strcmp_#in~dst#1.base|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_~x~0#1| 0) (<= 100000 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_main_~#b~0#1.base|) (<= 0 |#StackHeapBarrier|) (= (ite (= |ULTIMATE.start_main_#t~mem9#1| |ULTIMATE.start_main_#t~mem8#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 100000 |ULTIMATE.start__strcmp_~i~0#1|) (= |#NULL.base| 0))' at error location [2022-11-25 22:13:55,223 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 22:13:55,223 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 22:13:55,223 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7, 7] total 17 [2022-11-25 22:13:55,224 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1526953637] [2022-11-25 22:13:55,224 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 22:13:55,224 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-11-25 22:13:55,224 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 22:13:55,226 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-11-25 22:13:55,226 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=121, Invalid=431, Unknown=0, NotChecked=0, Total=552 [2022-11-25 22:13:55,227 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 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) [2022-11-25 22:13:55,298 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 22:13:55,298 INFO L93 Difference]: Finished difference Result 51 states and 61 transitions. [2022-11-25 22:13:55,298 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-11-25 22:13:55,298 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 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) Word has length 20 [2022-11-25 22:13:55,299 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 22:13:55,299 INFO L225 Difference]: With dead ends: 51 [2022-11-25 22:13:55,299 INFO L226 Difference]: Without dead ends: 35 [2022-11-25 22:13:55,305 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 38 SyntacticMatches, 4 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 227 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=121, Invalid=431, Unknown=0, NotChecked=0, Total=552 [2022-11-25 22:13:55,307 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 2 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 53 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 53 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 22:13:55,307 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 36 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 53 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 22:13:55,310 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2022-11-25 22:13:55,323 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2022-11-25 22:13:55,325 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 34 states have (on average 1.088235294117647) internal successors, (37), 34 states have internal predecessors, (37), 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) [2022-11-25 22:13:55,326 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 37 transitions. [2022-11-25 22:13:55,327 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 37 transitions. Word has length 20 [2022-11-25 22:13:55,327 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 22:13:55,327 INFO L495 AbstractCegarLoop]: Abstraction has 35 states and 37 transitions. [2022-11-25 22:13:55,327 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 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) [2022-11-25 22:13:55,328 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 37 transitions. [2022-11-25 22:13:55,329 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2022-11-25 22:13:55,329 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 22:13:55,329 INFO L195 NwaCegarLoop]: trace histogram [10, 10, 5, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 22:13:55,339 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2022-11-25 22:13:55,538 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2022-11-25 22:13:55,539 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 22:13:55,539 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 22:13:55,539 INFO L85 PathProgramCache]: Analyzing trace with hash 536609826, now seen corresponding path program 4 times [2022-11-25 22:13:55,540 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 22:13:55,540 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [220294990] [2022-11-25 22:13:55,540 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 22:13:55,540 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 22:13:55,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:13:55,672 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2022-11-25 22:13:55,672 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 22:13:55,673 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [220294990] [2022-11-25 22:13:55,673 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [220294990] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 22:13:55,673 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1296373817] [2022-11-25 22:13:55,673 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-25 22:13:55,673 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:13:55,674 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 22:13:55,675 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 22:13:55,687 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-25 22:13:55,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:13:55,800 INFO L263 TraceCheckSpWp]: Trace formula consists of 264 conjuncts, 7 conjunts are in the unsatisfiable core [2022-11-25 22:13:55,802 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 22:13:55,817 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2022-11-25 22:13:55,818 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 22:13:55,893 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2022-11-25 22:13:55,894 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1296373817] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 22:13:55,894 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [399216009] [2022-11-25 22:13:55,896 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-25 22:13:55,896 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 22:13:55,896 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 22:13:55,897 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 22:13:55,897 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 22:13:55,911 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:13:55,912 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:13:55,949 INFO L321 Elim1Store]: treesize reduction 37, result has 32.7 percent of original size [2022-11-25 22:13:55,950 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 34 [2022-11-25 22:13:55,965 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:13:55,967 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:13:56,006 INFO L321 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2022-11-25 22:13:56,007 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 53 [2022-11-25 22:13:56,035 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:13:56,036 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:13:56,039 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 8 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 35 [2022-11-25 22:13:56,106 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:13:56,107 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:13:56,110 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:13:56,111 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:13:56,112 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:13:56,177 INFO L321 Elim1Store]: treesize reduction 235, result has 16.4 percent of original size [2022-11-25 22:13:56,178 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 9 case distinctions, treesize of input 284 treesize of output 274 [2022-11-25 22:13:56,434 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:13:56,445 INFO L321 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2022-11-25 22:13:56,446 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 1 case distinctions, treesize of input 42 treesize of output 29 [2022-11-25 22:13:56,573 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 22:13:57,496 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1168#(and (= |ULTIMATE.start__strcmp_#res#1| 0) (<= 0 |ULTIMATE.start__strcmp_#in~dst#1.offset|) (<= 0 |ULTIMATE.start__strcmp_~dst#1.base|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (= |ULTIMATE.start_main_~#b~0#1.offset| 0) (<= 0 |ULTIMATE.start__strcmp_~src#1.base|) (<= |ULTIMATE.start__strcmp_~src#1.offset| 0) (= |ULTIMATE.start_main_~c~0#1| |ULTIMATE.start__strcmp_#res#1|) (<= 0 |ULTIMATE.start__strcmp_#in~src#1.offset|) (<= 0 |ULTIMATE.start__strcmp_~dst#1.offset|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~x~0#1| 4))) |ULTIMATE.start_main_#t~mem8#1|) (<= 0 |ULTIMATE.start__strcmp_#in~src#1.base|) (<= 0 |ULTIMATE.start__strcmp_~src#1.offset|) (<= |ULTIMATE.start__strcmp_#in~dst#1.offset| 0) (<= |ULTIMATE.start__strcmp_#in~src#1.offset| 0) (<= |ULTIMATE.start__strcmp_~dst#1.offset| 0) (= |ULTIMATE.start_main_#t~mem9#1| (select (select |#memory_int| |ULTIMATE.start_main_~#b~0#1.base|) (+ |ULTIMATE.start_main_~#b~0#1.offset| (* |ULTIMATE.start_main_~x~0#1| 4)))) (<= 0 |ULTIMATE.start__strcmp_#in~dst#1.base|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_~x~0#1| 0) (<= 100000 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_main_~#b~0#1.base|) (<= 0 |#StackHeapBarrier|) (= (ite (= |ULTIMATE.start_main_#t~mem9#1| |ULTIMATE.start_main_#t~mem8#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 100000 |ULTIMATE.start__strcmp_~i~0#1|) (= |#NULL.base| 0))' at error location [2022-11-25 22:13:57,496 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 22:13:57,496 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 22:13:57,497 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 14 [2022-11-25 22:13:57,497 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [37139555] [2022-11-25 22:13:57,497 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 22:13:57,497 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-11-25 22:13:57,497 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 22:13:57,498 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-11-25 22:13:57,498 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=357, Unknown=0, NotChecked=0, Total=506 [2022-11-25 22:13:57,499 INFO L87 Difference]: Start difference. First operand 35 states and 37 transitions. Second operand has 15 states, 15 states have (on average 1.6) internal successors, (24), 14 states have internal predecessors, (24), 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) [2022-11-25 22:13:57,545 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 22:13:57,545 INFO L93 Difference]: Finished difference Result 70 states and 80 transitions. [2022-11-25 22:13:57,546 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-11-25 22:13:57,546 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.6) internal successors, (24), 14 states have internal predecessors, (24), 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 [2022-11-25 22:13:57,546 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 22:13:57,547 INFO L225 Difference]: With dead ends: 70 [2022-11-25 22:13:57,547 INFO L226 Difference]: Without dead ends: 42 [2022-11-25 22:13:57,547 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 83 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 172 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=149, Invalid=357, Unknown=0, NotChecked=0, Total=506 [2022-11-25 22:13:57,548 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 0 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 27 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 28 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 27 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-25 22:13:57,549 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 32 Invalid, 28 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 27 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-25 22:13:57,549 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2022-11-25 22:13:57,555 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2022-11-25 22:13:57,556 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 41 states have (on average 1.0731707317073171) internal successors, (44), 41 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) [2022-11-25 22:13:57,560 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 44 transitions. [2022-11-25 22:13:57,561 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 44 transitions. Word has length 33 [2022-11-25 22:13:57,561 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 22:13:57,561 INFO L495 AbstractCegarLoop]: Abstraction has 42 states and 44 transitions. [2022-11-25 22:13:57,561 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 1.6) internal successors, (24), 14 states have internal predecessors, (24), 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) [2022-11-25 22:13:57,562 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 44 transitions. [2022-11-25 22:13:57,562 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2022-11-25 22:13:57,562 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 22:13:57,564 INFO L195 NwaCegarLoop]: trace histogram [12, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 22:13:57,574 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-25 22:13:57,764 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:13:57,765 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 22:13:57,765 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 22:13:57,765 INFO L85 PathProgramCache]: Analyzing trace with hash 126903194, now seen corresponding path program 5 times [2022-11-25 22:13:57,765 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 22:13:57,765 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1756826997] [2022-11-25 22:13:57,765 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 22:13:57,765 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 22:13:57,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:13:58,141 INFO L134 CoverageAnalysis]: Checked inductivity of 178 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2022-11-25 22:13:58,141 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 22:13:58,141 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1756826997] [2022-11-25 22:13:58,141 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1756826997] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 22:13:58,141 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1071620340] [2022-11-25 22:13:58,142 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 22:13:58,142 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:13:58,142 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 22:13:58,143 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 22:13:58,171 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-25 22:13:58,261 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-25 22:13:58,261 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 22:13:58,263 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 40 conjunts are in the unsatisfiable core [2022-11-25 22:13:58,265 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 22:13:58,604 INFO L134 CoverageAnalysis]: Checked inductivity of 178 backedges. 0 proven. 19 refuted. 0 times theorem prover too weak. 159 trivial. 0 not checked. [2022-11-25 22:13:58,604 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 22:13:58,801 INFO L321 Elim1Store]: treesize reduction 15, result has 81.9 percent of original size [2022-11-25 22:13:58,802 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 75 [2022-11-25 22:13:59,030 INFO L134 CoverageAnalysis]: Checked inductivity of 178 backedges. 9 proven. 10 refuted. 0 times theorem prover too weak. 159 trivial. 0 not checked. [2022-11-25 22:13:59,031 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1071620340] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 22:13:59,031 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1867902766] [2022-11-25 22:13:59,033 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-25 22:13:59,033 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 22:13:59,033 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 22:13:59,033 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 22:13:59,033 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 22:13:59,046 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:13:59,047 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:13:59,080 INFO L321 Elim1Store]: treesize reduction 37, result has 32.7 percent of original size [2022-11-25 22:13:59,081 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 34 [2022-11-25 22:13:59,110 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:13:59,112 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:13:59,145 INFO L321 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2022-11-25 22:13:59,145 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 53 [2022-11-25 22:13:59,169 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:13:59,170 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:13:59,173 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 8 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 35 [2022-11-25 22:13:59,238 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:13:59,239 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:13:59,242 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:13:59,243 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:13:59,244 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:13:59,318 INFO L321 Elim1Store]: treesize reduction 235, result has 16.4 percent of original size [2022-11-25 22:13:59,319 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 9 case distinctions, treesize of input 284 treesize of output 274 [2022-11-25 22:13:59,541 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:13:59,552 INFO L321 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2022-11-25 22:13:59,552 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 1 case distinctions, treesize of input 42 treesize of output 29 [2022-11-25 22:13:59,678 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 22:14:00,981 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1613#(and (= |ULTIMATE.start__strcmp_#res#1| 0) (<= 0 |ULTIMATE.start__strcmp_#in~dst#1.offset|) (<= 0 |ULTIMATE.start__strcmp_~dst#1.base|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (= |ULTIMATE.start_main_~#b~0#1.offset| 0) (<= 0 |ULTIMATE.start__strcmp_~src#1.base|) (<= |ULTIMATE.start__strcmp_~src#1.offset| 0) (= |ULTIMATE.start_main_~c~0#1| |ULTIMATE.start__strcmp_#res#1|) (<= 0 |ULTIMATE.start__strcmp_#in~src#1.offset|) (<= 0 |ULTIMATE.start__strcmp_~dst#1.offset|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~x~0#1| 4))) |ULTIMATE.start_main_#t~mem8#1|) (<= 0 |ULTIMATE.start__strcmp_#in~src#1.base|) (<= 0 |ULTIMATE.start__strcmp_~src#1.offset|) (<= |ULTIMATE.start__strcmp_#in~dst#1.offset| 0) (<= |ULTIMATE.start__strcmp_#in~src#1.offset| 0) (<= |ULTIMATE.start__strcmp_~dst#1.offset| 0) (= |ULTIMATE.start_main_#t~mem9#1| (select (select |#memory_int| |ULTIMATE.start_main_~#b~0#1.base|) (+ |ULTIMATE.start_main_~#b~0#1.offset| (* |ULTIMATE.start_main_~x~0#1| 4)))) (<= 0 |ULTIMATE.start__strcmp_#in~dst#1.base|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_~x~0#1| 0) (<= 100000 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_main_~#b~0#1.base|) (<= 0 |#StackHeapBarrier|) (= (ite (= |ULTIMATE.start_main_#t~mem9#1| |ULTIMATE.start_main_#t~mem8#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 100000 |ULTIMATE.start__strcmp_~i~0#1|) (= |#NULL.base| 0))' at error location [2022-11-25 22:14:00,981 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 22:14:00,981 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 22:14:00,981 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 7, 7] total 26 [2022-11-25 22:14:00,981 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [626396825] [2022-11-25 22:14:00,981 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 22:14:00,982 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-11-25 22:14:00,982 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 22:14:00,983 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-11-25 22:14:00,983 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=183, Invalid=873, Unknown=0, NotChecked=0, Total=1056 [2022-11-25 22:14:00,983 INFO L87 Difference]: Start difference. First operand 42 states and 44 transitions. Second operand has 26 states, 26 states have (on average 1.7692307692307692) internal successors, (46), 26 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) [2022-11-25 22:14:01,481 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 22:14:01,481 INFO L93 Difference]: Finished difference Result 75 states and 80 transitions. [2022-11-25 22:14:01,484 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-11-25 22:14:01,484 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.7692307692307692) internal successors, (46), 26 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 40 [2022-11-25 22:14:01,484 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 22:14:01,485 INFO L225 Difference]: With dead ends: 75 [2022-11-25 22:14:01,485 INFO L226 Difference]: Without dead ends: 47 [2022-11-25 22:14:01,486 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 91 SyntacticMatches, 10 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 706 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=426, Invalid=2024, Unknown=0, NotChecked=0, Total=2450 [2022-11-25 22:14:01,487 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 15 mSDsluCounter, 55 mSDsCounter, 0 mSdLazyCounter, 139 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 60 SdHoareTripleChecker+Invalid, 140 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 139 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 22:14:01,487 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 60 Invalid, 140 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 139 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 22:14:01,491 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2022-11-25 22:14:01,498 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 45. [2022-11-25 22:14:01,503 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) [2022-11-25 22:14:01,503 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 47 transitions. [2022-11-25 22:14:01,503 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 47 transitions. Word has length 40 [2022-11-25 22:14:01,504 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 22:14:01,504 INFO L495 AbstractCegarLoop]: Abstraction has 45 states and 47 transitions. [2022-11-25 22:14:01,504 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 1.7692307692307692) internal successors, (46), 26 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) [2022-11-25 22:14:01,504 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 47 transitions. [2022-11-25 22:14:01,505 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-11-25 22:14:01,505 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 22:14:01,505 INFO L195 NwaCegarLoop]: trace histogram [13, 10, 10, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 22:14:01,516 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-25 22:14:01,710 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:14:01,711 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 22:14:01,711 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 22:14:01,711 INFO L85 PathProgramCache]: Analyzing trace with hash -1008499743, now seen corresponding path program 1 times [2022-11-25 22:14:01,711 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 22:14:01,712 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1933031639] [2022-11-25 22:14:01,712 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 22:14:01,712 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 22:14:01,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:14:02,087 INFO L134 CoverageAnalysis]: Checked inductivity of 193 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 102 trivial. 0 not checked. [2022-11-25 22:14:02,087 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 22:14:02,088 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1933031639] [2022-11-25 22:14:02,088 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1933031639] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 22:14:02,088 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1722397435] [2022-11-25 22:14:02,088 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 22:14:02,088 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:14:02,088 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 22:14:02,089 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 22:14:02,103 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-25 22:14:02,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:14:02,260 INFO L263 TraceCheckSpWp]: Trace formula consists of 412 conjuncts, 15 conjunts are in the unsatisfiable core [2022-11-25 22:14:02,266 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 22:14:02,303 INFO L134 CoverageAnalysis]: Checked inductivity of 193 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 102 trivial. 0 not checked. [2022-11-25 22:14:02,303 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 22:14:02,618 INFO L134 CoverageAnalysis]: Checked inductivity of 193 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 102 trivial. 0 not checked. [2022-11-25 22:14:02,618 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1722397435] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 22:14:02,618 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1982434092] [2022-11-25 22:14:02,621 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-25 22:14:02,621 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 22:14:02,621 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 22:14:02,622 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 22:14:02,622 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 22:14:02,646 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:14:02,648 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:14:02,680 INFO L321 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2022-11-25 22:14:02,681 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 53 [2022-11-25 22:14:02,690 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:14:02,692 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:14:02,693 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 8 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 27 [2022-11-25 22:14:02,714 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:14:02,715 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:14:02,716 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 8 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 35 [2022-11-25 22:14:02,794 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:14:02,795 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:14:02,798 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:14:02,799 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:14:02,800 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:14:02,872 INFO L321 Elim1Store]: treesize reduction 235, result has 16.4 percent of original size [2022-11-25 22:14:02,872 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 9 case distinctions, treesize of input 284 treesize of output 274 [2022-11-25 22:14:03,103 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:14:03,114 INFO L321 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2022-11-25 22:14:03,114 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 1 case distinctions, treesize of input 42 treesize of output 29 [2022-11-25 22:14:03,373 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 22:14:04,273 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2133#(and (= |ULTIMATE.start_main_~c~0#1| 0) (= |ULTIMATE.start__strcmp_#res#1| 0) (<= 0 |ULTIMATE.start__strcmp_#in~dst#1.offset|) (<= 0 |ULTIMATE.start__strcmp_~dst#1.base|) (<= 0 |ULTIMATE.start_main_~x~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (= |ULTIMATE.start_main_~#b~0#1.offset| 0) (<= 0 |ULTIMATE.start__strcmp_~src#1.base|) (<= |ULTIMATE.start__strcmp_~src#1.offset| 0) (<= 0 |ULTIMATE.start__strcmp_#in~src#1.offset|) (<= 0 |ULTIMATE.start__strcmp_~dst#1.offset|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~x~0#1| 4))) |ULTIMATE.start_main_#t~mem8#1|) (<= 0 |ULTIMATE.start__strcmp_#in~src#1.base|) (<= 0 |ULTIMATE.start__strcmp_~src#1.offset|) (<= |ULTIMATE.start__strcmp_#in~dst#1.offset| 0) (<= |ULTIMATE.start__strcmp_#in~src#1.offset| 0) (< |ULTIMATE.start_main_~x~0#1| 100000) (<= |ULTIMATE.start__strcmp_~dst#1.offset| 0) (= |ULTIMATE.start_main_#t~mem9#1| (select (select |#memory_int| |ULTIMATE.start_main_~#b~0#1.base|) (+ |ULTIMATE.start_main_~#b~0#1.offset| (* |ULTIMATE.start_main_~x~0#1| 4)))) (<= 0 |ULTIMATE.start__strcmp_#in~dst#1.base|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 100000 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_main_~#b~0#1.base|) (<= 0 |#StackHeapBarrier|) (= (ite (= |ULTIMATE.start_main_#t~mem9#1| |ULTIMATE.start_main_#t~mem8#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 100000 |ULTIMATE.start__strcmp_~i~0#1|) (= |#NULL.base| 0))' at error location [2022-11-25 22:14:04,273 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 22:14:04,273 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 22:14:04,273 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 30 [2022-11-25 22:14:04,274 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [666764445] [2022-11-25 22:14:04,274 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 22:14:04,274 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2022-11-25 22:14:04,274 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 22:14:04,275 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2022-11-25 22:14:04,276 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=518, Invalid=1042, Unknown=0, NotChecked=0, Total=1560 [2022-11-25 22:14:04,276 INFO L87 Difference]: Start difference. First operand 45 states and 47 transitions. Second operand has 31 states, 31 states have (on average 1.3548387096774193) internal successors, (42), 30 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) [2022-11-25 22:14:04,356 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 22:14:04,356 INFO L93 Difference]: Finished difference Result 90 states and 108 transitions. [2022-11-25 22:14:04,357 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-11-25 22:14:04,357 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 1.3548387096774193) internal successors, (42), 30 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) Word has length 44 [2022-11-25 22:14:04,357 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 22:14:04,358 INFO L225 Difference]: With dead ends: 90 [2022-11-25 22:14:04,358 INFO L226 Difference]: Without dead ends: 60 [2022-11-25 22:14:04,359 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 145 GetRequests, 107 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 446 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=518, Invalid=1042, Unknown=0, NotChecked=0, Total=1560 [2022-11-25 22:14:04,360 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 0 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 54 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 64 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 54 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 22:14:04,360 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 64 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 54 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 22:14:04,361 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2022-11-25 22:14:04,370 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2022-11-25 22:14:04,370 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 59 states have (on average 1.0508474576271187) internal successors, (62), 59 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) [2022-11-25 22:14:04,371 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 62 transitions. [2022-11-25 22:14:04,371 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 62 transitions. Word has length 44 [2022-11-25 22:14:04,371 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 22:14:04,372 INFO L495 AbstractCegarLoop]: Abstraction has 60 states and 62 transitions. [2022-11-25 22:14:04,372 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 1.3548387096774193) internal successors, (42), 30 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) [2022-11-25 22:14:04,372 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 62 transitions. [2022-11-25 22:14:04,373 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2022-11-25 22:14:04,373 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 22:14:04,373 INFO L195 NwaCegarLoop]: trace histogram [28, 10, 10, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 22:14:04,387 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-25 22:14:04,579 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-11-25 22:14:04,580 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 22:14:04,580 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 22:14:04,580 INFO L85 PathProgramCache]: Analyzing trace with hash 409208169, now seen corresponding path program 2 times [2022-11-25 22:14:04,580 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 22:14:04,580 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [29962102] [2022-11-25 22:14:04,580 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 22:14:04,580 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 22:14:04,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:14:05,672 INFO L134 CoverageAnalysis]: Checked inductivity of 508 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 102 trivial. 0 not checked. [2022-11-25 22:14:05,673 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 22:14:05,673 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [29962102] [2022-11-25 22:14:05,673 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [29962102] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 22:14:05,673 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [32985836] [2022-11-25 22:14:05,673 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 22:14:05,673 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:14:05,674 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 22:14:05,676 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 22:14:05,679 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-25 22:14:05,988 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-11-25 22:14:05,988 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 22:14:05,991 INFO L263 TraceCheckSpWp]: Trace formula consists of 273 conjuncts, 46 conjunts are in the unsatisfiable core [2022-11-25 22:14:05,995 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 22:14:06,137 INFO L321 Elim1Store]: treesize reduction 34, result has 35.8 percent of original size [2022-11-25 22:14:06,138 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 44 treesize of output 82 [2022-11-25 22:14:06,147 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 0 case distinctions, treesize of input 12 treesize of output 11 [2022-11-25 22:14:06,153 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 0 case distinctions, treesize of input 20 treesize of output 19 [2022-11-25 22:14:06,186 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 0 case distinctions, treesize of input 43 treesize of output 25 [2022-11-25 22:14:06,190 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 17 treesize of output 11 [2022-11-25 22:14:07,322 INFO L134 CoverageAnalysis]: Checked inductivity of 508 backedges. 28 proven. 38 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2022-11-25 22:14:07,322 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 22:14:07,656 INFO L134 CoverageAnalysis]: Checked inductivity of 508 backedges. 34 proven. 4 refuted. 0 times theorem prover too weak. 470 trivial. 0 not checked. [2022-11-25 22:14:07,656 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [32985836] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 22:14:07,656 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [615958601] [2022-11-25 22:14:07,658 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-25 22:14:07,659 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 22:14:07,659 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 22:14:07,659 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 22:14:07,659 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 22:14:07,672 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:14:07,673 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:14:07,704 INFO L321 Elim1Store]: treesize reduction 37, result has 32.7 percent of original size [2022-11-25 22:14:07,705 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 34 [2022-11-25 22:14:07,717 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:14:07,719 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:14:07,756 INFO L321 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2022-11-25 22:14:07,757 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 53 [2022-11-25 22:14:07,779 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:14:07,780 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:14:07,782 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 8 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 35 [2022-11-25 22:14:07,845 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:14:07,847 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:14:07,850 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:14:07,852 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:14:07,852 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:14:07,917 INFO L321 Elim1Store]: treesize reduction 235, result has 16.4 percent of original size [2022-11-25 22:14:07,917 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 9 case distinctions, treesize of input 284 treesize of output 274 [2022-11-25 22:14:08,129 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:14:08,140 INFO L321 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2022-11-25 22:14:08,140 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 1 case distinctions, treesize of input 42 treesize of output 29 [2022-11-25 22:14:08,373 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 22:14:09,800 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2787#(and (= |ULTIMATE.start_main_~c~0#1| 0) (= |ULTIMATE.start__strcmp_#res#1| 0) (<= 0 |ULTIMATE.start__strcmp_#in~dst#1.offset|) (<= 0 |ULTIMATE.start__strcmp_~dst#1.base|) (<= 0 |ULTIMATE.start_main_~x~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (= |ULTIMATE.start_main_~#b~0#1.offset| 0) (<= 0 |ULTIMATE.start__strcmp_~src#1.base|) (<= |ULTIMATE.start__strcmp_~src#1.offset| 0) (<= 0 |ULTIMATE.start__strcmp_#in~src#1.offset|) (<= 0 |ULTIMATE.start__strcmp_~dst#1.offset|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~x~0#1| 4))) |ULTIMATE.start_main_#t~mem8#1|) (<= 0 |ULTIMATE.start__strcmp_#in~src#1.base|) (<= 0 |ULTIMATE.start__strcmp_~src#1.offset|) (<= |ULTIMATE.start__strcmp_#in~dst#1.offset| 0) (<= |ULTIMATE.start__strcmp_#in~src#1.offset| 0) (< |ULTIMATE.start_main_~x~0#1| 100000) (<= |ULTIMATE.start__strcmp_~dst#1.offset| 0) (= |ULTIMATE.start_main_#t~mem9#1| (select (select |#memory_int| |ULTIMATE.start_main_~#b~0#1.base|) (+ |ULTIMATE.start_main_~#b~0#1.offset| (* |ULTIMATE.start_main_~x~0#1| 4)))) (<= 0 |ULTIMATE.start__strcmp_#in~dst#1.base|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 100000 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_main_~#b~0#1.base|) (<= 0 |#StackHeapBarrier|) (= (ite (= |ULTIMATE.start_main_#t~mem9#1| |ULTIMATE.start_main_#t~mem8#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 100000 |ULTIMATE.start__strcmp_~i~0#1|) (= |#NULL.base| 0))' at error location [2022-11-25 22:14:09,801 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 22:14:09,801 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 22:14:09,801 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 10, 9] total 47 [2022-11-25 22:14:09,801 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [898054980] [2022-11-25 22:14:09,801 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 22:14:09,802 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2022-11-25 22:14:09,802 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 22:14:09,803 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2022-11-25 22:14:09,804 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=598, Invalid=2471, Unknown=11, NotChecked=0, Total=3080 [2022-11-25 22:14:09,805 INFO L87 Difference]: Start difference. First operand 60 states and 62 transitions. Second operand has 47 states, 47 states have (on average 1.5957446808510638) internal successors, (75), 47 states have internal predecessors, (75), 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) [2022-11-25 22:14:12,289 WARN L859 $PredicateComparison]: unable to prove that (let ((.cse2 (select |c_#memory_int| |c_ULTIMATE.start_main_~#a~0#1.base|)) (.cse0 (select |c_#memory_int| |c_ULTIMATE.start_main_~#b~0#1.base|))) (and (or (exists ((v_DerPreprocessor_1 (Array Int Int)) (v_DerPreprocessor_2 (Array Int Int)) (|v_ULTIMATE.start_main_~i~1#1_76| Int)) (and (let ((.cse1 (+ |c_ULTIMATE.start_main_~#b~0#1.offset| (* |v_ULTIMATE.start_main_~i~1#1_76| 4)))) (= (select .cse0 .cse1) (select v_DerPreprocessor_2 .cse1))) (= .cse2 (select (store (store (store (store |c_#memory_int| |c_ULTIMATE.start_main_~#a~0#1.base| v_DerPreprocessor_1) |c_ULTIMATE.start_main_~#b~0#1.base| v_DerPreprocessor_2) |c_ULTIMATE.start_main_~#a~0#1.base| v_DerPreprocessor_1) |c_ULTIMATE.start_main_~#b~0#1.base| v_DerPreprocessor_2) |c_ULTIMATE.start_main_~#a~0#1.base|)))) (= |c_ULTIMATE.start_main_~#b~0#1.base| |c_ULTIMATE.start_main_~#a~0#1.base|)) (not (= |c_ULTIMATE.start___VERIFIER_assert_~cond#1| 0)) (= |c_ULTIMATE.start_main_~#b~0#1.offset| 0) (= (select .cse2 (+ |c_ULTIMATE.start_main_~#a~0#1.offset| 4)) (select .cse0 (+ |c_ULTIMATE.start_main_~#b~0#1.offset| 4))) (= |c_ULTIMATE.start_main_~#a~0#1.offset| 0))) is different from true [2022-11-25 22:14:12,306 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 22:14:12,306 INFO L93 Difference]: Finished difference Result 101 states and 106 transitions. [2022-11-25 22:14:12,307 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2022-11-25 22:14:12,307 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 1.5957446808510638) internal successors, (75), 47 states have internal predecessors, (75), 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 59 [2022-11-25 22:14:12,307 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 22:14:12,308 INFO L225 Difference]: With dead ends: 101 [2022-11-25 22:14:12,308 INFO L226 Difference]: Without dead ends: 71 [2022-11-25 22:14:12,311 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 151 SyntacticMatches, 0 SemanticMatches, 89 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 1741 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=1586, Invalid=6387, Unknown=41, NotChecked=176, Total=8190 [2022-11-25 22:14:12,312 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 31 mSDsluCounter, 83 mSDsCounter, 0 mSdLazyCounter, 241 mSolverCounterSat, 3 mSolverCounterUnsat, 12 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 89 SdHoareTripleChecker+Invalid, 257 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 241 IncrementalHoareTripleChecker+Invalid, 12 IncrementalHoareTripleChecker+Unknown, 1 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-25 22:14:12,312 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [31 Valid, 89 Invalid, 257 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 241 Invalid, 12 Unknown, 1 Unchecked, 0.3s Time] [2022-11-25 22:14:12,313 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2022-11-25 22:14:12,340 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 64. [2022-11-25 22:14:12,341 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 63 states have (on average 1.0476190476190477) internal successors, (66), 63 states have internal predecessors, (66), 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) [2022-11-25 22:14:12,343 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 66 transitions. [2022-11-25 22:14:12,343 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 66 transitions. Word has length 59 [2022-11-25 22:14:12,343 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 22:14:12,344 INFO L495 AbstractCegarLoop]: Abstraction has 64 states and 66 transitions. [2022-11-25 22:14:12,344 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 47 states have (on average 1.5957446808510638) internal successors, (75), 47 states have internal predecessors, (75), 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) [2022-11-25 22:14:12,344 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 66 transitions. [2022-11-25 22:14:12,345 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2022-11-25 22:14:12,345 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 22:14:12,345 INFO L195 NwaCegarLoop]: trace histogram [29, 10, 10, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 22:14:12,360 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-25 22:14:12,552 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-11-25 22:14:12,552 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 22:14:12,552 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 22:14:12,552 INFO L85 PathProgramCache]: Analyzing trace with hash -899601470, now seen corresponding path program 3 times [2022-11-25 22:14:12,552 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 22:14:12,552 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [20122801] [2022-11-25 22:14:12,553 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 22:14:12,553 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 22:14:12,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:14:13,726 INFO L134 CoverageAnalysis]: Checked inductivity of 542 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 107 trivial. 0 not checked. [2022-11-25 22:14:13,726 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 22:14:13,726 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [20122801] [2022-11-25 22:14:13,727 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [20122801] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 22:14:13,727 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1031796372] [2022-11-25 22:14:13,727 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 22:14:13,727 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:14:13,727 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 22:14:13,729 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 22:14:13,755 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-25 22:14:14,002 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 22:14:14,002 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 22:14:14,005 INFO L263 TraceCheckSpWp]: Trace formula consists of 696 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-25 22:14:14,007 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 22:14:14,282 INFO L134 CoverageAnalysis]: Checked inductivity of 542 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2022-11-25 22:14:14,283 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 22:14:14,647 INFO L134 CoverageAnalysis]: Checked inductivity of 542 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2022-11-25 22:14:14,647 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1031796372] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 22:14:14,647 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [778561155] [2022-11-25 22:14:14,650 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-25 22:14:14,650 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 22:14:14,650 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 22:14:14,650 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 22:14:14,651 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 22:14:14,672 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:14:14,674 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:14:14,716 INFO L321 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2022-11-25 22:14:14,716 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 53 [2022-11-25 22:14:14,729 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:14:14,730 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:14:14,731 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 8 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 27 [2022-11-25 22:14:14,759 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:14:14,760 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:14:14,762 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 8 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 57 treesize of output 45 [2022-11-25 22:14:14,823 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:14:14,824 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:14:14,825 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:14:14,826 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:14:14,827 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:14:14,830 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:14:14,831 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:14:14,865 INFO L321 Elim1Store]: treesize reduction 135, result has 12.9 percent of original size [2022-11-25 22:14:14,866 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 304 treesize of output 272 [2022-11-25 22:14:14,928 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:14:14,939 INFO L321 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2022-11-25 22:14:14,940 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 1 case distinctions, treesize of input 42 treesize of output 29 [2022-11-25 22:14:15,190 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 22:14:16,786 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3563#(and (= |ULTIMATE.start_main_~c~0#1| 0) (= |ULTIMATE.start__strcmp_#res#1| 0) (<= 0 |ULTIMATE.start__strcmp_#in~dst#1.offset|) (<= 0 |ULTIMATE.start__strcmp_~dst#1.base|) (<= 0 |ULTIMATE.start_main_~x~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (= |ULTIMATE.start_main_~#b~0#1.offset| 0) (<= 0 |ULTIMATE.start__strcmp_~src#1.base|) (<= |ULTIMATE.start__strcmp_~src#1.offset| 0) (<= 0 |ULTIMATE.start__strcmp_#in~src#1.offset|) (<= 0 |ULTIMATE.start__strcmp_~dst#1.offset|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~x~0#1| 4))) |ULTIMATE.start_main_#t~mem8#1|) (<= 0 |ULTIMATE.start__strcmp_#in~src#1.base|) (<= 0 |ULTIMATE.start__strcmp_~src#1.offset|) (<= |ULTIMATE.start__strcmp_#in~dst#1.offset| 0) (<= |ULTIMATE.start__strcmp_#in~src#1.offset| 0) (< |ULTIMATE.start_main_~x~0#1| 100000) (<= |ULTIMATE.start__strcmp_~dst#1.offset| 0) (= |ULTIMATE.start_main_#t~mem9#1| (select (select |#memory_int| |ULTIMATE.start_main_~#b~0#1.base|) (+ |ULTIMATE.start_main_~#b~0#1.offset| (* |ULTIMATE.start_main_~x~0#1| 4)))) (<= 0 |ULTIMATE.start__strcmp_#in~dst#1.base|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 100000 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_main_~#b~0#1.base|) (<= 0 |#StackHeapBarrier|) (= (ite (= |ULTIMATE.start_main_#t~mem9#1| |ULTIMATE.start_main_#t~mem8#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 100000 |ULTIMATE.start__strcmp_~i~0#1|) (= |#NULL.base| 0))' at error location [2022-11-25 22:14:16,786 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 22:14:16,786 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 22:14:16,786 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 13, 13] total 54 [2022-11-25 22:14:16,787 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1527864833] [2022-11-25 22:14:16,787 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 22:14:16,787 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 54 states [2022-11-25 22:14:16,787 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 22:14:16,788 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2022-11-25 22:14:16,789 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=814, Invalid=2968, Unknown=0, NotChecked=0, Total=3782 [2022-11-25 22:14:16,789 INFO L87 Difference]: Start difference. First operand 64 states and 66 transitions. Second operand has 54 states, 54 states have (on average 1.6111111111111112) internal successors, (87), 54 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) [2022-11-25 22:14:16,960 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 22:14:16,960 INFO L93 Difference]: Finished difference Result 122 states and 138 transitions. [2022-11-25 22:14:16,961 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2022-11-25 22:14:16,961 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 1.6111111111111112) internal successors, (87), 54 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) Word has length 63 [2022-11-25 22:14:16,961 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 22:14:16,962 INFO L225 Difference]: With dead ends: 122 [2022-11-25 22:14:16,962 INFO L226 Difference]: Without dead ends: 89 [2022-11-25 22:14:16,963 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 218 GetRequests, 148 SyntacticMatches, 10 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1724 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=814, Invalid=2968, Unknown=0, NotChecked=0, Total=3782 [2022-11-25 22:14:16,964 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 2 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 102 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 104 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 102 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 22:14:16,964 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 36 Invalid, 104 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 102 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 22:14:16,965 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2022-11-25 22:14:16,997 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 89. [2022-11-25 22:14:16,998 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) [2022-11-25 22:14:16,998 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 91 transitions. [2022-11-25 22:14:16,998 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 91 transitions. Word has length 63 [2022-11-25 22:14:16,999 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 22:14:16,999 INFO L495 AbstractCegarLoop]: Abstraction has 89 states and 91 transitions. [2022-11-25 22:14:17,000 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 54 states, 54 states have (on average 1.6111111111111112) internal successors, (87), 54 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) [2022-11-25 22:14:17,000 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 91 transitions. [2022-11-25 22:14:17,008 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2022-11-25 22:14:17,008 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 22:14:17,008 INFO L195 NwaCegarLoop]: trace histogram [30, 22, 22, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 22:14:17,020 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-25 22:14:17,215 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2022-11-25 22:14:17,215 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 22:14:17,215 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 22:14:17,215 INFO L85 PathProgramCache]: Analyzing trace with hash -276979850, now seen corresponding path program 4 times [2022-11-25 22:14:17,215 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 22:14:17,216 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1699868550] [2022-11-25 22:14:17,216 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 22:14:17,216 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 22:14:17,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:14:18,479 INFO L134 CoverageAnalysis]: Checked inductivity of 956 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 491 trivial. 0 not checked. [2022-11-25 22:14:18,480 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 22:14:18,480 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1699868550] [2022-11-25 22:14:18,480 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1699868550] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 22:14:18,480 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [183562272] [2022-11-25 22:14:18,480 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-25 22:14:18,480 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:14:18,481 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 22:14:18,481 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 22:14:18,491 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-25 22:14:18,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:14:18,781 INFO L263 TraceCheckSpWp]: Trace formula consists of 821 conjuncts, 32 conjunts are in the unsatisfiable core [2022-11-25 22:14:18,783 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 22:14:18,853 INFO L134 CoverageAnalysis]: Checked inductivity of 956 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 491 trivial. 0 not checked. [2022-11-25 22:14:18,853 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 22:14:20,155 INFO L134 CoverageAnalysis]: Checked inductivity of 956 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 491 trivial. 0 not checked. [2022-11-25 22:14:20,155 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [183562272] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 22:14:20,155 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [153574851] [2022-11-25 22:14:20,156 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-25 22:14:20,156 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 22:14:20,156 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 22:14:20,156 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 22:14:20,156 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 22:14:20,167 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:14:20,168 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:14:20,197 INFO L321 Elim1Store]: treesize reduction 37, result has 32.7 percent of original size [2022-11-25 22:14:20,197 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 34 [2022-11-25 22:14:20,209 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:14:20,211 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:14:20,243 INFO L321 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2022-11-25 22:14:20,243 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 53 [2022-11-25 22:14:20,273 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:14:20,274 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:14:20,276 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 8 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 57 treesize of output 45 [2022-11-25 22:14:20,335 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:14:20,336 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:14:20,338 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:14:20,339 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:14:20,340 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:14:20,343 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:14:20,344 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:14:20,380 INFO L321 Elim1Store]: treesize reduction 135, result has 12.9 percent of original size [2022-11-25 22:14:20,380 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 304 treesize of output 272 [2022-11-25 22:14:20,437 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:14:20,448 INFO L321 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2022-11-25 22:14:20,449 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 1 case distinctions, treesize of input 42 treesize of output 29 [2022-11-25 22:14:20,727 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 22:14:23,108 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4500#(and (= |ULTIMATE.start__strcmp_#res#1| 0) (<= 0 |ULTIMATE.start__strcmp_#in~dst#1.offset|) (<= 0 |ULTIMATE.start__strcmp_~dst#1.base|) (<= 0 |ULTIMATE.start_main_~x~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (= |ULTIMATE.start_main_~#b~0#1.offset| 0) (<= 0 |ULTIMATE.start__strcmp_~src#1.base|) (<= |ULTIMATE.start__strcmp_~src#1.offset| 0) (<= 0 |ULTIMATE.start__strcmp_#in~src#1.offset|) (<= 0 |ULTIMATE.start__strcmp_~dst#1.offset|) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~x~0#1| 4))) |ULTIMATE.start_main_#t~mem8#1|) (<= 0 |ULTIMATE.start__strcmp_#in~src#1.base|) (<= 0 |ULTIMATE.start__strcmp_~src#1.offset|) (<= 0 |ULTIMATE.start_main_~c~0#1|) (<= |ULTIMATE.start__strcmp_#in~dst#1.offset| 0) (<= |ULTIMATE.start__strcmp_#in~src#1.offset| 0) (<= |ULTIMATE.start_main_~c~0#1| 0) (< |ULTIMATE.start_main_~x~0#1| 100000) (<= |ULTIMATE.start__strcmp_~dst#1.offset| 0) (= |ULTIMATE.start_main_#t~mem9#1| (select (select |#memory_int| |ULTIMATE.start_main_~#b~0#1.base|) (+ |ULTIMATE.start_main_~#b~0#1.offset| (* |ULTIMATE.start_main_~x~0#1| 4)))) (<= 0 |ULTIMATE.start__strcmp_#in~dst#1.base|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 100000 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_main_~#b~0#1.base|) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= (ite (= |ULTIMATE.start_main_#t~mem9#1| |ULTIMATE.start_main_#t~mem8#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 100000 |ULTIMATE.start__strcmp_~i~0#1|) (= |#NULL.base| 0))' at error location [2022-11-25 22:14:23,108 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 22:14:23,109 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 22:14:23,109 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 64 [2022-11-25 22:14:23,109 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1096615050] [2022-11-25 22:14:23,109 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 22:14:23,109 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 65 states [2022-11-25 22:14:23,110 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 22:14:23,111 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2022-11-25 22:14:23,112 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2123, Invalid=3133, Unknown=0, NotChecked=0, Total=5256 [2022-11-25 22:14:23,112 INFO L87 Difference]: Start difference. First operand 89 states and 91 transitions. Second operand has 65 states, 65 states have (on average 1.1692307692307693) internal successors, (76), 64 states have internal predecessors, (76), 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) [2022-11-25 22:14:23,268 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 22:14:23,269 INFO L93 Difference]: Finished difference Result 178 states and 213 transitions. [2022-11-25 22:14:23,269 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2022-11-25 22:14:23,269 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 65 states have (on average 1.1692307692307693) internal successors, (76), 64 states have internal predecessors, (76), 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 [2022-11-25 22:14:23,270 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 22:14:23,270 INFO L225 Difference]: With dead ends: 178 [2022-11-25 22:14:23,270 INFO L226 Difference]: Without dead ends: 121 [2022-11-25 22:14:23,272 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 294 GetRequests, 201 SyntacticMatches, 22 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2916 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=2123, Invalid=3133, Unknown=0, NotChecked=0, Total=5256 [2022-11-25 22:14:23,273 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 0 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 94 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 80 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 [2022-11-25 22:14:23,273 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 80 Invalid, 95 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 94 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 22:14:23,274 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2022-11-25 22:14:23,304 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 121. [2022-11-25 22:14:23,305 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 121 states, 120 states have (on average 1.025) internal successors, (123), 120 states have internal predecessors, (123), 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) [2022-11-25 22:14:23,306 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 123 transitions. [2022-11-25 22:14:23,306 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 123 transitions. Word has length 88 [2022-11-25 22:14:23,306 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 22:14:23,306 INFO L495 AbstractCegarLoop]: Abstraction has 121 states and 123 transitions. [2022-11-25 22:14:23,306 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 65 states, 65 states have (on average 1.1692307692307693) internal successors, (76), 64 states have internal predecessors, (76), 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) [2022-11-25 22:14:23,307 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 123 transitions. [2022-11-25 22:14:23,308 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2022-11-25 22:14:23,308 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 22:14:23,308 INFO L195 NwaCegarLoop]: trace histogram [62, 22, 22, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 22:14:23,320 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-11-25 22:14:23,520 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:14:23,520 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 22:14:23,520 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 22:14:23,520 INFO L85 PathProgramCache]: Analyzing trace with hash -2051494026, now seen corresponding path program 5 times [2022-11-25 22:14:23,520 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 22:14:23,520 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [104239017] [2022-11-25 22:14:23,521 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 22:14:23,521 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 22:14:23,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:14:27,481 INFO L134 CoverageAnalysis]: Checked inductivity of 2444 backedges. 0 proven. 1953 refuted. 0 times theorem prover too weak. 491 trivial. 0 not checked. [2022-11-25 22:14:27,482 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 22:14:27,482 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [104239017] [2022-11-25 22:14:27,482 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [104239017] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 22:14:27,482 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [64177848] [2022-11-25 22:14:27,482 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 22:14:27,483 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:14:27,483 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 22:14:27,484 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 22:14:27,486 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-11-25 22:14:28,534 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2022-11-25 22:14:28,534 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 22:14:28,538 INFO L263 TraceCheckSpWp]: Trace formula consists of 371 conjuncts, 53 conjunts are in the unsatisfiable core [2022-11-25 22:14:28,541 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 22:14:29,798 INFO L134 CoverageAnalysis]: Checked inductivity of 2444 backedges. 0 proven. 130 refuted. 0 times theorem prover too weak. 2314 trivial. 0 not checked. [2022-11-25 22:14:29,798 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 22:14:30,361 INFO L321 Elim1Store]: treesize reduction 15, result has 83.5 percent of original size [2022-11-25 22:14:30,362 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 36 treesize of output 83 [2022-11-25 22:14:31,133 INFO L134 CoverageAnalysis]: Checked inductivity of 2444 backedges. 19 proven. 111 refuted. 0 times theorem prover too weak. 2314 trivial. 0 not checked. [2022-11-25 22:14:31,133 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [64177848] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 22:14:31,133 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [523753900] [2022-11-25 22:14:31,135 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-25 22:14:31,135 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 22:14:31,135 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 22:14:31,136 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 22:14:31,136 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 22:14:31,148 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:14:31,150 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:14:31,178 INFO L321 Elim1Store]: treesize reduction 37, result has 32.7 percent of original size [2022-11-25 22:14:31,178 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 34 [2022-11-25 22:14:31,195 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:14:31,197 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:14:31,237 INFO L321 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2022-11-25 22:14:31,238 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 53 [2022-11-25 22:14:31,266 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:14:31,267 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:14:31,269 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 8 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 57 treesize of output 45 [2022-11-25 22:14:31,333 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:14:31,334 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:14:31,336 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:14:31,337 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:14:31,338 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:14:31,341 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:14:31,343 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:14:31,377 INFO L321 Elim1Store]: treesize reduction 135, result has 12.9 percent of original size [2022-11-25 22:14:31,378 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 304 treesize of output 272 [2022-11-25 22:14:31,447 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:14:31,459 INFO L321 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2022-11-25 22:14:31,459 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 1 case distinctions, treesize of input 42 treesize of output 29 [2022-11-25 22:14:31,688 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 22:14:33,469 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5814#(and (= |ULTIMATE.start_main_~c~0#1| 0) (= |ULTIMATE.start__strcmp_#res#1| 0) (<= 0 |ULTIMATE.start__strcmp_#in~dst#1.offset|) (<= 0 |ULTIMATE.start__strcmp_~dst#1.base|) (<= 0 |ULTIMATE.start_main_~x~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (= |ULTIMATE.start_main_~#b~0#1.offset| 0) (<= 0 |ULTIMATE.start__strcmp_~src#1.base|) (<= |ULTIMATE.start__strcmp_~src#1.offset| 0) (<= 0 |ULTIMATE.start__strcmp_#in~src#1.offset|) (<= 0 |ULTIMATE.start__strcmp_~dst#1.offset|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~x~0#1| 4))) |ULTIMATE.start_main_#t~mem8#1|) (<= 0 |ULTIMATE.start__strcmp_#in~src#1.base|) (<= 0 |ULTIMATE.start__strcmp_~src#1.offset|) (<= |ULTIMATE.start__strcmp_#in~dst#1.offset| 0) (<= |ULTIMATE.start__strcmp_#in~src#1.offset| 0) (< |ULTIMATE.start_main_~x~0#1| 100000) (<= |ULTIMATE.start__strcmp_~dst#1.offset| 0) (= |ULTIMATE.start_main_#t~mem9#1| (select (select |#memory_int| |ULTIMATE.start_main_~#b~0#1.base|) (+ |ULTIMATE.start_main_~#b~0#1.offset| (* |ULTIMATE.start_main_~x~0#1| 4)))) (<= 0 |ULTIMATE.start__strcmp_#in~dst#1.base|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 100000 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_main_~#b~0#1.base|) (<= 0 |#StackHeapBarrier|) (= (ite (= |ULTIMATE.start_main_#t~mem9#1| |ULTIMATE.start_main_#t~mem8#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 100000 |ULTIMATE.start__strcmp_~i~0#1|) (= |#NULL.base| 0))' at error location [2022-11-25 22:14:33,469 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 22:14:33,469 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 22:14:33,469 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [64, 12, 12] total 86 [2022-11-25 22:14:33,469 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1193880266] [2022-11-25 22:14:33,469 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 22:14:33,470 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 86 states [2022-11-25 22:14:33,470 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 22:14:33,471 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 86 interpolants. [2022-11-25 22:14:33,473 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2225, Invalid=6705, Unknown=0, NotChecked=0, Total=8930 [2022-11-25 22:14:33,474 INFO L87 Difference]: Start difference. First operand 121 states and 123 transitions. Second operand has 86 states, 86 states have (on average 1.372093023255814) internal successors, (118), 86 states have internal predecessors, (118), 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) [2022-11-25 22:14:37,272 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 22:14:37,272 INFO L93 Difference]: Finished difference Result 184 states and 189 transitions. [2022-11-25 22:14:37,272 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 80 states. [2022-11-25 22:14:37,273 INFO L78 Accepts]: Start accepts. Automaton has has 86 states, 86 states have (on average 1.372093023255814) internal successors, (118), 86 states have internal predecessors, (118), 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 120 [2022-11-25 22:14:37,273 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 22:14:37,274 INFO L225 Difference]: With dead ends: 184 [2022-11-25 22:14:37,274 INFO L226 Difference]: Without dead ends: 127 [2022-11-25 22:14:37,280 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 493 GetRequests, 329 SyntacticMatches, 0 SemanticMatches, 164 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5472 ImplicationChecksByTransitivity, 8.1s TimeCoverageRelationStatistics Valid=6465, Invalid=20925, Unknown=0, NotChecked=0, Total=27390 [2022-11-25 22:14:37,280 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 32 mSDsluCounter, 71 mSDsCounter, 0 mSdLazyCounter, 354 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 77 SdHoareTripleChecker+Invalid, 358 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 354 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-25 22:14:37,281 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [32 Valid, 77 Invalid, 358 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 354 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-25 22:14:37,281 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2022-11-25 22:14:37,311 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 125. [2022-11-25 22:14:37,312 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 125 states, 124 states have (on average 1.0241935483870968) internal successors, (127), 124 states have internal predecessors, (127), 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) [2022-11-25 22:14:37,313 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 127 transitions. [2022-11-25 22:14:37,313 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 127 transitions. Word has length 120 [2022-11-25 22:14:37,313 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 22:14:37,313 INFO L495 AbstractCegarLoop]: Abstraction has 125 states and 127 transitions. [2022-11-25 22:14:37,314 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 86 states, 86 states have (on average 1.372093023255814) internal successors, (118), 86 states have internal predecessors, (118), 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) [2022-11-25 22:14:37,314 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 127 transitions. [2022-11-25 22:14:37,315 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2022-11-25 22:14:37,315 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 22:14:37,315 INFO L195 NwaCegarLoop]: trace histogram [63, 22, 22, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 22:14:37,327 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-11-25 22:14:37,523 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-11-25 22:14:37,523 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 22:14:37,523 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 22:14:37,523 INFO L85 PathProgramCache]: Analyzing trace with hash -1866749307, now seen corresponding path program 6 times [2022-11-25 22:14:37,523 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 22:14:37,523 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1426260552] [2022-11-25 22:14:37,524 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 22:14:37,524 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 22:14:37,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:14:41,509 INFO L134 CoverageAnalysis]: Checked inductivity of 2515 backedges. 0 proven. 2016 refuted. 0 times theorem prover too weak. 499 trivial. 0 not checked. [2022-11-25 22:14:41,509 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 22:14:41,510 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1426260552] [2022-11-25 22:14:41,510 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1426260552] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 22:14:41,510 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [31423145] [2022-11-25 22:14:41,510 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 22:14:41,510 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:14:41,510 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 22:14:41,511 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 22:14:41,513 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-11-25 22:14:41,967 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 22:14:41,967 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 22:14:41,973 INFO L263 TraceCheckSpWp]: Trace formula consists of 1394 conjuncts, 24 conjunts are in the unsatisfiable core [2022-11-25 22:14:41,976 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 22:14:42,945 INFO L134 CoverageAnalysis]: Checked inductivity of 2515 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 2031 trivial. 0 not checked. [2022-11-25 22:14:42,945 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 22:14:44,349 INFO L134 CoverageAnalysis]: Checked inductivity of 2515 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 2031 trivial. 0 not checked. [2022-11-25 22:14:44,349 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [31423145] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 22:14:44,349 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1899617477] [2022-11-25 22:14:44,351 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-25 22:14:44,351 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 22:14:44,352 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 22:14:44,352 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 22:14:44,352 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 22:14:44,371 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:14:44,373 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:14:44,406 INFO L321 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2022-11-25 22:14:44,406 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 53 [2022-11-25 22:14:44,418 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:14:44,419 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:14:44,423 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 8 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 27 [2022-11-25 22:14:44,441 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:14:44,442 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:14:44,446 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 8 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 35 [2022-11-25 22:14:44,507 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:14:44,508 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:14:44,511 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:14:44,512 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:14:44,513 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:14:44,587 INFO L321 Elim1Store]: treesize reduction 235, result has 16.4 percent of original size [2022-11-25 22:14:44,588 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 9 case distinctions, treesize of input 284 treesize of output 274 [2022-11-25 22:14:44,800 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:14:44,815 INFO L321 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2022-11-25 22:14:44,815 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 1 case distinctions, treesize of input 42 treesize of output 29 [2022-11-25 22:14:45,019 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 22:14:46,625 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7336#(and (= |ULTIMATE.start_main_~c~0#1| 0) (= |ULTIMATE.start__strcmp_#res#1| 0) (<= 0 |ULTIMATE.start__strcmp_#in~dst#1.offset|) (<= 0 |ULTIMATE.start__strcmp_~dst#1.base|) (<= 0 |ULTIMATE.start_main_~x~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (= |ULTIMATE.start_main_~#b~0#1.offset| 0) (<= 0 |ULTIMATE.start__strcmp_~src#1.base|) (<= |ULTIMATE.start__strcmp_~src#1.offset| 0) (<= 0 |ULTIMATE.start__strcmp_#in~src#1.offset|) (<= 0 |ULTIMATE.start__strcmp_~dst#1.offset|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~x~0#1| 4))) |ULTIMATE.start_main_#t~mem8#1|) (<= 0 |ULTIMATE.start__strcmp_#in~src#1.base|) (<= 0 |ULTIMATE.start__strcmp_~src#1.offset|) (<= |ULTIMATE.start__strcmp_#in~dst#1.offset| 0) (<= |ULTIMATE.start__strcmp_#in~src#1.offset| 0) (< |ULTIMATE.start_main_~x~0#1| 100000) (<= |ULTIMATE.start__strcmp_~dst#1.offset| 0) (= |ULTIMATE.start_main_#t~mem9#1| (select (select |#memory_int| |ULTIMATE.start_main_~#b~0#1.base|) (+ |ULTIMATE.start_main_~#b~0#1.offset| (* |ULTIMATE.start_main_~x~0#1| 4)))) (<= 0 |ULTIMATE.start__strcmp_#in~dst#1.base|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 100000 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_main_~#b~0#1.base|) (<= 0 |#StackHeapBarrier|) (= (ite (= |ULTIMATE.start_main_#t~mem9#1| |ULTIMATE.start_main_#t~mem8#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 100000 |ULTIMATE.start__strcmp_~i~0#1|) (= |#NULL.base| 0))' at error location [2022-11-25 22:14:46,626 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 22:14:46,626 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 22:14:46,626 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [65, 25, 25] total 112 [2022-11-25 22:14:46,626 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1884831282] [2022-11-25 22:14:46,627 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 22:14:46,627 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 112 states [2022-11-25 22:14:46,627 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 22:14:46,629 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 112 interpolants. [2022-11-25 22:14:46,630 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3325, Invalid=11195, Unknown=0, NotChecked=0, Total=14520 [2022-11-25 22:14:46,631 INFO L87 Difference]: Start difference. First operand 125 states and 127 transitions. Second operand has 112 states, 112 states have (on average 1.5089285714285714) internal successors, (169), 112 states have internal predecessors, (169), 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) [2022-11-25 22:14:46,931 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 22:14:46,931 INFO L93 Difference]: Finished difference Result 234 states and 262 transitions. [2022-11-25 22:14:46,931 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 112 states. [2022-11-25 22:14:46,932 INFO L78 Accepts]: Start accepts. Automaton has has 112 states, 112 states have (on average 1.5089285714285714) internal successors, (169), 112 states have internal predecessors, (169), 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 124 [2022-11-25 22:14:46,932 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 22:14:46,933 INFO L225 Difference]: With dead ends: 234 [2022-11-25 22:14:46,933 INFO L226 Difference]: Without dead ends: 174 [2022-11-25 22:14:46,935 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 435 GetRequests, 316 SyntacticMatches, 0 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4084 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=3325, Invalid=11195, Unknown=0, NotChecked=0, Total=14520 [2022-11-25 22:14:46,936 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 2 mSDsluCounter, 60 mSDsCounter, 0 mSdLazyCounter, 208 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 66 SdHoareTripleChecker+Invalid, 210 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 208 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-25 22:14:46,936 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 66 Invalid, 210 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 208 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-25 22:14:46,937 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 174 states. [2022-11-25 22:14:46,968 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 174 to 174. [2022-11-25 22:14:46,969 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 174 states, 173 states have (on average 1.0173410404624277) internal successors, (176), 173 states have internal predecessors, (176), 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) [2022-11-25 22:14:46,970 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 176 transitions. [2022-11-25 22:14:46,970 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 176 transitions. Word has length 124 [2022-11-25 22:14:46,970 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 22:14:46,971 INFO L495 AbstractCegarLoop]: Abstraction has 174 states and 176 transitions. [2022-11-25 22:14:46,971 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 112 states, 112 states have (on average 1.5089285714285714) internal successors, (169), 112 states have internal predecessors, (169), 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) [2022-11-25 22:14:46,971 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 176 transitions. [2022-11-25 22:14:46,973 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 174 [2022-11-25 22:14:46,973 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 22:14:46,973 INFO L195 NwaCegarLoop]: trace histogram [64, 46, 46, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 22:14:46,982 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-11-25 22:14:47,182 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-11-25 22:14:47,182 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 22:14:47,182 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 22:14:47,183 INFO L85 PathProgramCache]: Analyzing trace with hash -1803810411, now seen corresponding path program 7 times [2022-11-25 22:14:47,183 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 22:14:47,183 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1424477937] [2022-11-25 22:14:47,183 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 22:14:47,183 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 22:14:47,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:14:51,367 INFO L134 CoverageAnalysis]: Checked inductivity of 4211 backedges. 0 proven. 2080 refuted. 0 times theorem prover too weak. 2131 trivial. 0 not checked. [2022-11-25 22:14:51,368 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 22:14:51,368 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1424477937] [2022-11-25 22:14:51,368 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1424477937] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 22:14:51,368 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [280711759] [2022-11-25 22:14:51,368 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-25 22:14:51,368 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:14:51,369 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 22:14:51,369 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 22:14:51,372 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-11-25 22:14:51,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:14:51,907 INFO L263 TraceCheckSpWp]: Trace formula consists of 1627 conjuncts, 66 conjunts are in the unsatisfiable core [2022-11-25 22:14:51,910 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 22:14:52,052 INFO L134 CoverageAnalysis]: Checked inductivity of 4211 backedges. 0 proven. 2080 refuted. 0 times theorem prover too weak. 2131 trivial. 0 not checked. [2022-11-25 22:14:52,052 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 22:14:57,264 INFO L134 CoverageAnalysis]: Checked inductivity of 4211 backedges. 0 proven. 2080 refuted. 0 times theorem prover too weak. 2131 trivial. 0 not checked. [2022-11-25 22:14:57,264 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [280711759] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 22:14:57,264 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [894689973] [2022-11-25 22:14:57,265 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-25 22:14:57,265 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 22:14:57,266 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 22:14:57,266 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 22:14:57,266 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 22:14:57,279 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:14:57,280 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:14:57,308 INFO L321 Elim1Store]: treesize reduction 37, result has 32.7 percent of original size [2022-11-25 22:14:57,308 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 34 [2022-11-25 22:14:57,321 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:14:57,323 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:14:57,357 INFO L321 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2022-11-25 22:14:57,357 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 53 [2022-11-25 22:14:57,380 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:14:57,381 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:14:57,383 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 8 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 57 treesize of output 45 [2022-11-25 22:14:57,432 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:14:57,433 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:14:57,435 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:14:57,436 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:14:57,436 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:14:57,439 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:14:57,440 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:14:57,471 INFO L321 Elim1Store]: treesize reduction 135, result has 12.9 percent of original size [2022-11-25 22:14:57,471 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 304 treesize of output 272 [2022-11-25 22:14:57,530 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:14:57,541 INFO L321 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2022-11-25 22:14:57,542 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 1 case distinctions, treesize of input 42 treesize of output 29 [2022-11-25 22:14:57,801 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 22:15:03,467 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9180#(and (= |ULTIMATE.start__strcmp_#res#1| 0) (<= 0 |ULTIMATE.start__strcmp_#in~dst#1.offset|) (<= 0 |ULTIMATE.start__strcmp_~dst#1.base|) (<= 0 |ULTIMATE.start_main_~x~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (= |ULTIMATE.start_main_~#b~0#1.offset| 0) (<= 0 |ULTIMATE.start__strcmp_~src#1.base|) (<= |ULTIMATE.start__strcmp_~src#1.offset| 0) (<= 0 |ULTIMATE.start__strcmp_#in~src#1.offset|) (<= 0 |ULTIMATE.start__strcmp_~dst#1.offset|) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~x~0#1| 4))) |ULTIMATE.start_main_#t~mem8#1|) (<= 0 |ULTIMATE.start__strcmp_#in~src#1.base|) (<= 0 |ULTIMATE.start__strcmp_~src#1.offset|) (<= 0 |ULTIMATE.start_main_~c~0#1|) (<= |ULTIMATE.start__strcmp_#in~dst#1.offset| 0) (<= |ULTIMATE.start__strcmp_#in~src#1.offset| 0) (<= |ULTIMATE.start_main_~c~0#1| 0) (< |ULTIMATE.start_main_~x~0#1| 100000) (<= |ULTIMATE.start__strcmp_~dst#1.offset| 0) (= |ULTIMATE.start_main_#t~mem9#1| (select (select |#memory_int| |ULTIMATE.start_main_~#b~0#1.base|) (+ |ULTIMATE.start_main_~#b~0#1.offset| (* |ULTIMATE.start_main_~x~0#1| 4)))) (<= 0 |ULTIMATE.start__strcmp_#in~dst#1.base|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 100000 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_main_~#b~0#1.base|) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= (ite (= |ULTIMATE.start_main_#t~mem9#1| |ULTIMATE.start_main_#t~mem8#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 100000 |ULTIMATE.start__strcmp_~i~0#1|) (= |#NULL.base| 0))' at error location [2022-11-25 22:15:03,467 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 22:15:03,468 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 22:15:03,468 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [66, 66, 66] total 132 [2022-11-25 22:15:03,468 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1811688749] [2022-11-25 22:15:03,468 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 22:15:03,469 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 133 states [2022-11-25 22:15:03,469 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 22:15:03,471 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 133 interpolants. [2022-11-25 22:15:03,473 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8821, Invalid=10919, Unknown=0, NotChecked=0, Total=19740 [2022-11-25 22:15:03,473 INFO L87 Difference]: Start difference. First operand 174 states and 176 transitions. Second operand has 133 states, 133 states have (on average 1.0827067669172932) internal successors, (144), 132 states have internal predecessors, (144), 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) [2022-11-25 22:15:03,777 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 22:15:03,777 INFO L93 Difference]: Finished difference Result 348 states and 417 transitions. [2022-11-25 22:15:03,778 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 132 states. [2022-11-25 22:15:03,778 INFO L78 Accepts]: Start accepts. Automaton has has 133 states, 133 states have (on average 1.0827067669172932) internal successors, (144), 132 states have internal predecessors, (144), 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 173 [2022-11-25 22:15:03,778 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 22:15:03,780 INFO L225 Difference]: With dead ends: 348 [2022-11-25 22:15:03,780 INFO L226 Difference]: Without dead ends: 240 [2022-11-25 22:15:03,781 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 583 GetRequests, 398 SyntacticMatches, 46 SemanticMatches, 139 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10792 ImplicationChecksByTransitivity, 12.6s TimeCoverageRelationStatistics Valid=8821, Invalid=10919, Unknown=0, NotChecked=0, Total=19740 [2022-11-25 22:15:03,782 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 0 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 156 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 64 SdHoareTripleChecker+Invalid, 157 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 156 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 22:15:03,782 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 64 Invalid, 157 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 156 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 22:15:03,783 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 240 states. [2022-11-25 22:15:03,818 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 240 to 240. [2022-11-25 22:15:03,819 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 240 states, 239 states have (on average 1.0125523012552302) internal successors, (242), 239 states have internal predecessors, (242), 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) [2022-11-25 22:15:03,819 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 240 states to 240 states and 242 transitions. [2022-11-25 22:15:03,819 INFO L78 Accepts]: Start accepts. Automaton has 240 states and 242 transitions. Word has length 173 [2022-11-25 22:15:03,820 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 22:15:03,820 INFO L495 AbstractCegarLoop]: Abstraction has 240 states and 242 transitions. [2022-11-25 22:15:03,820 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 133 states, 133 states have (on average 1.0827067669172932) internal successors, (144), 132 states have internal predecessors, (144), 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) [2022-11-25 22:15:03,820 INFO L276 IsEmpty]: Start isEmpty. Operand 240 states and 242 transitions. [2022-11-25 22:15:03,823 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 240 [2022-11-25 22:15:03,823 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 22:15:03,823 INFO L195 NwaCegarLoop]: trace histogram [130, 46, 46, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 22:15:03,831 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-11-25 22:15:04,031 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-11-25 22:15:04,031 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 22:15:04,032 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 22:15:04,032 INFO L85 PathProgramCache]: Analyzing trace with hash -1650919275, now seen corresponding path program 8 times [2022-11-25 22:15:04,032 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 22:15:04,032 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [783500825] [2022-11-25 22:15:04,032 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 22:15:04,032 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 22:15:04,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:15:16,924 INFO L134 CoverageAnalysis]: Checked inductivity of 10646 backedges. 0 proven. 8515 refuted. 0 times theorem prover too weak. 2131 trivial. 0 not checked. [2022-11-25 22:15:16,925 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 22:15:16,925 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [783500825] [2022-11-25 22:15:16,925 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [783500825] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 22:15:16,925 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [78612125] [2022-11-25 22:15:16,925 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 22:15:16,925 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:15:16,925 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 22:15:16,926 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 22:15:16,929 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-11-25 22:15:19,754 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2022-11-25 22:15:19,754 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 22:15:19,762 INFO L263 TraceCheckSpWp]: Trace formula consists of 469 conjuncts, 57 conjunts are in the unsatisfiable core [2022-11-25 22:15:19,765 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 22:15:22,091 INFO L134 CoverageAnalysis]: Checked inductivity of 10646 backedges. 0 proven. 367 refuted. 0 times theorem prover too weak. 10279 trivial. 0 not checked. [2022-11-25 22:15:22,091 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 22:15:23,087 INFO L321 Elim1Store]: treesize reduction 15, result has 83.5 percent of original size [2022-11-25 22:15:23,087 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 36 treesize of output 83 [2022-11-25 22:15:24,287 INFO L134 CoverageAnalysis]: Checked inductivity of 10646 backedges. 42 proven. 325 refuted. 0 times theorem prover too weak. 10279 trivial. 0 not checked. [2022-11-25 22:15:24,287 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [78612125] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 22:15:24,287 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [633444418] [2022-11-25 22:15:24,289 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-25 22:15:24,289 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 22:15:24,289 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 22:15:24,289 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 22:15:24,289 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 22:15:24,308 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:15:24,309 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:15:24,339 INFO L321 Elim1Store]: treesize reduction 37, result has 32.7 percent of original size [2022-11-25 22:15:24,339 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 34 [2022-11-25 22:15:24,350 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:15:24,352 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:15:24,385 INFO L321 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2022-11-25 22:15:24,386 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 53 [2022-11-25 22:15:24,408 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:15:24,409 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:15:24,413 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 8 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 57 treesize of output 45 [2022-11-25 22:15:24,476 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:15:24,477 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:15:24,478 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:15:24,480 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:15:24,480 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:15:24,483 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:15:24,484 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:15:24,513 INFO L321 Elim1Store]: treesize reduction 135, result has 12.9 percent of original size [2022-11-25 22:15:24,514 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 304 treesize of output 272 [2022-11-25 22:15:24,574 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:15:24,585 INFO L321 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2022-11-25 22:15:24,586 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 1 case distinctions, treesize of input 42 treesize of output 29 [2022-11-25 22:15:24,788 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 22:15:36,190 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11780#(and (= |ULTIMATE.start_main_~c~0#1| 0) (= |ULTIMATE.start__strcmp_#res#1| 0) (<= 0 |ULTIMATE.start__strcmp_#in~dst#1.offset|) (<= 0 |ULTIMATE.start__strcmp_~dst#1.base|) (<= 0 |ULTIMATE.start_main_~x~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (= |ULTIMATE.start_main_~#b~0#1.offset| 0) (<= 0 |ULTIMATE.start__strcmp_~src#1.base|) (<= |ULTIMATE.start__strcmp_~src#1.offset| 0) (<= 0 |ULTIMATE.start__strcmp_#in~src#1.offset|) (<= 0 |ULTIMATE.start__strcmp_~dst#1.offset|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~x~0#1| 4))) |ULTIMATE.start_main_#t~mem8#1|) (<= 0 |ULTIMATE.start__strcmp_#in~src#1.base|) (<= 0 |ULTIMATE.start__strcmp_~src#1.offset|) (<= |ULTIMATE.start__strcmp_#in~dst#1.offset| 0) (<= |ULTIMATE.start__strcmp_#in~src#1.offset| 0) (< |ULTIMATE.start_main_~x~0#1| 100000) (<= |ULTIMATE.start__strcmp_~dst#1.offset| 0) (= |ULTIMATE.start_main_#t~mem9#1| (select (select |#memory_int| |ULTIMATE.start_main_~#b~0#1.base|) (+ |ULTIMATE.start_main_~#b~0#1.offset| (* |ULTIMATE.start_main_~x~0#1| 4)))) (<= 0 |ULTIMATE.start__strcmp_#in~dst#1.base|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 100000 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_main_~#b~0#1.base|) (<= 0 |#StackHeapBarrier|) (= (ite (= |ULTIMATE.start_main_#t~mem9#1| |ULTIMATE.start_main_#t~mem8#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 100000 |ULTIMATE.start__strcmp_~i~0#1|) (= |#NULL.base| 0))' at error location [2022-11-25 22:15:36,190 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 22:15:36,190 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 22:15:36,191 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [132, 14, 14] total 158 [2022-11-25 22:15:36,191 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2119087712] [2022-11-25 22:15:36,191 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 22:15:36,192 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 158 states [2022-11-25 22:15:36,192 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 22:15:36,195 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 158 interpolants. [2022-11-25 22:15:36,196 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8927, Invalid=18463, Unknown=0, NotChecked=0, Total=27390 [2022-11-25 22:15:36,196 INFO L87 Difference]: Start difference. First operand 240 states and 242 transitions. Second operand has 158 states, 158 states have (on average 1.240506329113924) internal successors, (196), 158 states have internal predecessors, (196), 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) [2022-11-25 22:15:48,311 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 22:15:48,312 INFO L93 Difference]: Finished difference Result 354 states and 359 transitions. [2022-11-25 22:15:48,312 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 151 states. [2022-11-25 22:15:48,312 INFO L78 Accepts]: Start accepts. Automaton has has 158 states, 158 states have (on average 1.240506329113924) internal successors, (196), 158 states have internal predecessors, (196), 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 239 [2022-11-25 22:15:48,312 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 22:15:48,313 INFO L225 Difference]: With dead ends: 354 [2022-11-25 22:15:48,314 INFO L226 Difference]: Without dead ends: 246 [2022-11-25 22:15:48,320 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 987 GetRequests, 637 SyntacticMatches, 46 SemanticMatches, 304 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22836 ImplicationChecksByTransitivity, 32.1s TimeCoverageRelationStatistics Valid=26573, Invalid=66757, Unknown=0, NotChecked=0, Total=93330 [2022-11-25 22:15:48,320 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 38 mSDsluCounter, 131 mSDsCounter, 0 mSdLazyCounter, 626 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 138 SdHoareTripleChecker+Invalid, 632 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 626 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-25 22:15:48,321 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [38 Valid, 138 Invalid, 632 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 626 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-25 22:15:48,321 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 246 states. [2022-11-25 22:15:48,368 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 246 to 244. [2022-11-25 22:15:48,368 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 244 states, 243 states have (on average 1.0123456790123457) internal successors, (246), 243 states have internal predecessors, (246), 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) [2022-11-25 22:15:48,369 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 244 states to 244 states and 246 transitions. [2022-11-25 22:15:48,369 INFO L78 Accepts]: Start accepts. Automaton has 244 states and 246 transitions. Word has length 239 [2022-11-25 22:15:48,369 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 22:15:48,369 INFO L495 AbstractCegarLoop]: Abstraction has 244 states and 246 transitions. [2022-11-25 22:15:48,370 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 158 states, 158 states have (on average 1.240506329113924) internal successors, (196), 158 states have internal predecessors, (196), 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) [2022-11-25 22:15:48,370 INFO L276 IsEmpty]: Start isEmpty. Operand 244 states and 246 transitions. [2022-11-25 22:15:48,372 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 244 [2022-11-25 22:15:48,373 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 22:15:48,373 INFO L195 NwaCegarLoop]: trace histogram [131, 46, 46, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 22:15:48,383 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2022-11-25 22:15:48,582 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-11-25 22:15:48,583 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 22:15:48,583 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 22:15:48,583 INFO L85 PathProgramCache]: Analyzing trace with hash -1401019114, now seen corresponding path program 9 times [2022-11-25 22:15:48,583 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 22:15:48,583 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [169451510] [2022-11-25 22:15:48,583 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 22:15:48,583 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 22:15:48,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:16:01,759 INFO L134 CoverageAnalysis]: Checked inductivity of 10788 backedges. 0 proven. 8646 refuted. 0 times theorem prover too weak. 2142 trivial. 0 not checked. [2022-11-25 22:16:01,759 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 22:16:01,759 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [169451510] [2022-11-25 22:16:01,760 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [169451510] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 22:16:01,760 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [862286535] [2022-11-25 22:16:01,760 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 22:16:01,760 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:16:01,760 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 22:16:01,761 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 22:16:01,763 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-11-25 22:16:02,654 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 22:16:02,654 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 22:16:02,666 INFO L263 TraceCheckSpWp]: Trace formula consists of 2778 conjuncts, 48 conjunts are in the unsatisfiable core [2022-11-25 22:16:02,671 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 22:16:06,321 INFO L134 CoverageAnalysis]: Checked inductivity of 10788 backedges. 0 proven. 2116 refuted. 0 times theorem prover too weak. 8672 trivial. 0 not checked. [2022-11-25 22:16:06,321 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 22:16:11,607 INFO L134 CoverageAnalysis]: Checked inductivity of 10788 backedges. 0 proven. 2116 refuted. 0 times theorem prover too weak. 8672 trivial. 0 not checked. [2022-11-25 22:16:11,608 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [862286535] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 22:16:11,608 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [500440361] [2022-11-25 22:16:11,610 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-25 22:16:11,610 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 22:16:11,610 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 22:16:11,610 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 22:16:11,611 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 22:16:11,629 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:16:11,631 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:16:11,668 INFO L321 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2022-11-25 22:16:11,668 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 53 [2022-11-25 22:16:11,683 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:16:11,684 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:16:11,685 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 8 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 27 [2022-11-25 22:16:11,704 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:16:11,705 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:16:11,707 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 8 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 57 treesize of output 45 [2022-11-25 22:16:11,769 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:16:11,770 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:16:11,771 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:16:11,772 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:16:11,773 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:16:11,776 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:16:11,777 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:16:11,810 INFO L321 Elim1Store]: treesize reduction 135, result has 12.9 percent of original size [2022-11-25 22:16:11,811 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 304 treesize of output 272 [2022-11-25 22:16:11,870 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:16:11,882 INFO L321 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2022-11-25 22:16:11,883 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 1 case distinctions, treesize of input 42 treesize of output 29 [2022-11-25 22:16:12,102 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 22:16:14,770 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '14769#(and (= |ULTIMATE.start_main_~c~0#1| 0) (= |ULTIMATE.start__strcmp_#res#1| 0) (<= 0 |ULTIMATE.start__strcmp_#in~dst#1.offset|) (<= 0 |ULTIMATE.start__strcmp_~dst#1.base|) (<= 0 |ULTIMATE.start_main_~x~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (= |ULTIMATE.start_main_~#b~0#1.offset| 0) (<= 0 |ULTIMATE.start__strcmp_~src#1.base|) (<= |ULTIMATE.start__strcmp_~src#1.offset| 0) (<= 0 |ULTIMATE.start__strcmp_#in~src#1.offset|) (<= 0 |ULTIMATE.start__strcmp_~dst#1.offset|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~x~0#1| 4))) |ULTIMATE.start_main_#t~mem8#1|) (<= 0 |ULTIMATE.start__strcmp_#in~src#1.base|) (<= 0 |ULTIMATE.start__strcmp_~src#1.offset|) (<= |ULTIMATE.start__strcmp_#in~dst#1.offset| 0) (<= |ULTIMATE.start__strcmp_#in~src#1.offset| 0) (< |ULTIMATE.start_main_~x~0#1| 100000) (<= |ULTIMATE.start__strcmp_~dst#1.offset| 0) (= |ULTIMATE.start_main_#t~mem9#1| (select (select |#memory_int| |ULTIMATE.start_main_~#b~0#1.base|) (+ |ULTIMATE.start_main_~#b~0#1.offset| (* |ULTIMATE.start_main_~x~0#1| 4)))) (<= 0 |ULTIMATE.start__strcmp_#in~dst#1.base|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 100000 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_main_~#b~0#1.base|) (<= 0 |#StackHeapBarrier|) (= (ite (= |ULTIMATE.start_main_#t~mem9#1| |ULTIMATE.start_main_#t~mem8#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 100000 |ULTIMATE.start__strcmp_~i~0#1|) (= |#NULL.base| 0))' at error location [2022-11-25 22:16:14,770 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 22:16:14,770 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 22:16:14,771 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [133, 49, 49] total 228 [2022-11-25 22:16:14,771 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1798189821] [2022-11-25 22:16:14,771 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 22:16:14,771 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 228 states [2022-11-25 22:16:14,771 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 22:16:14,773 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 228 interpolants. [2022-11-25 22:16:14,775 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13523, Invalid=42409, Unknown=0, NotChecked=0, Total=55932 [2022-11-25 22:16:14,776 INFO L87 Difference]: Start difference. First operand 244 states and 246 transitions. Second operand has 228 states, 228 states have (on average 1.4605263157894737) internal successors, (333), 228 states have internal predecessors, (333), 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) [2022-11-25 22:16:15,510 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 22:16:15,510 INFO L93 Difference]: Finished difference Result 452 states and 504 transitions. [2022-11-25 22:16:15,510 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 228 states. [2022-11-25 22:16:15,511 INFO L78 Accepts]: Start accepts. Automaton has has 228 states, 228 states have (on average 1.4605263157894737) internal successors, (333), 228 states have internal predecessors, (333), 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 243 [2022-11-25 22:16:15,511 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 22:16:15,512 INFO L225 Difference]: With dead ends: 452 [2022-11-25 22:16:15,512 INFO L226 Difference]: Without dead ends: 341 [2022-11-25 22:16:15,516 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 860 GetRequests, 625 SyntacticMatches, 0 SemanticMatches, 235 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14760 ImplicationChecksByTransitivity, 18.1s TimeCoverageRelationStatistics Valid=13523, Invalid=42409, Unknown=0, NotChecked=0, Total=55932 [2022-11-25 22:16:15,517 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 2 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 362 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 54 SdHoareTripleChecker+Invalid, 364 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 362 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-25 22:16:15,517 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 54 Invalid, 364 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 362 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-25 22:16:15,518 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 341 states. [2022-11-25 22:16:15,566 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 341 to 341. [2022-11-25 22:16:15,566 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 341 states, 340 states have (on average 1.0088235294117647) internal successors, (343), 340 states have internal predecessors, (343), 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) [2022-11-25 22:16:15,567 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 341 states to 341 states and 343 transitions. [2022-11-25 22:16:15,567 INFO L78 Accepts]: Start accepts. Automaton has 341 states and 343 transitions. Word has length 243 [2022-11-25 22:16:15,567 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 22:16:15,568 INFO L495 AbstractCegarLoop]: Abstraction has 341 states and 343 transitions. [2022-11-25 22:16:15,568 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 228 states, 228 states have (on average 1.4605263157894737) internal successors, (333), 228 states have internal predecessors, (333), 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) [2022-11-25 22:16:15,568 INFO L276 IsEmpty]: Start isEmpty. Operand 341 states and 343 transitions. [2022-11-25 22:16:15,570 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 341 [2022-11-25 22:16:15,570 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 22:16:15,571 INFO L195 NwaCegarLoop]: trace histogram [132, 94, 94, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 22:16:15,580 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-11-25 22:16:15,779 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-11-25 22:16:15,779 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 22:16:15,780 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 22:16:15,780 INFO L85 PathProgramCache]: Analyzing trace with hash -2018186114, now seen corresponding path program 10 times [2022-11-25 22:16:15,780 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 22:16:15,780 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [89532206] [2022-11-25 22:16:15,780 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 22:16:15,780 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 22:16:16,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:16:29,790 INFO L134 CoverageAnalysis]: Checked inductivity of 17640 backedges. 0 proven. 8778 refuted. 0 times theorem prover too weak. 8862 trivial. 0 not checked. [2022-11-25 22:16:29,790 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 22:16:29,791 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [89532206] [2022-11-25 22:16:29,791 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [89532206] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 22:16:29,791 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2104768345] [2022-11-25 22:16:29,791 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-25 22:16:29,791 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:16:29,791 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 22:16:29,799 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 22:16:29,819 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-11-25 22:16:30,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:16:30,909 INFO L263 TraceCheckSpWp]: Trace formula consists of 3227 conjuncts, 134 conjunts are in the unsatisfiable core [2022-11-25 22:16:30,915 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 22:16:31,134 INFO L134 CoverageAnalysis]: Checked inductivity of 17640 backedges. 0 proven. 8778 refuted. 0 times theorem prover too weak. 8862 trivial. 0 not checked. [2022-11-25 22:16:31,134 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 22:16:52,544 INFO L134 CoverageAnalysis]: Checked inductivity of 17640 backedges. 0 proven. 8778 refuted. 0 times theorem prover too weak. 8862 trivial. 0 not checked. [2022-11-25 22:16:52,544 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2104768345] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 22:16:52,544 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1793180665] [2022-11-25 22:16:52,546 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-25 22:16:52,546 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 22:16:52,547 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 22:16:52,547 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 22:16:52,547 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 22:16:52,557 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:16:52,558 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:16:52,584 INFO L321 Elim1Store]: treesize reduction 37, result has 32.7 percent of original size [2022-11-25 22:16:52,585 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 34 [2022-11-25 22:16:52,596 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:16:52,598 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:16:52,629 INFO L321 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2022-11-25 22:16:52,629 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 53 [2022-11-25 22:16:52,651 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:16:52,652 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:16:52,653 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 8 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 57 treesize of output 45 [2022-11-25 22:16:52,712 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:16:52,713 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:16:52,714 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:16:52,715 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:16:52,716 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:16:52,718 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:16:52,719 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:16:52,750 INFO L321 Elim1Store]: treesize reduction 135, result has 12.9 percent of original size [2022-11-25 22:16:52,750 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 304 treesize of output 272 [2022-11-25 22:16:52,813 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:16:52,824 INFO L321 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2022-11-25 22:16:52,824 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 1 case distinctions, treesize of input 42 treesize of output 29 [2022-11-25 22:16:52,990 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 22:16:55,114 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '18395#(and (= |ULTIMATE.start_main_~c~0#1| 0) (= |ULTIMATE.start__strcmp_#res#1| 0) (<= 0 |ULTIMATE.start__strcmp_#in~dst#1.offset|) (<= 0 |ULTIMATE.start__strcmp_~dst#1.base|) (<= 0 |ULTIMATE.start_main_~x~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (= |ULTIMATE.start_main_~#b~0#1.offset| 0) (<= 0 |ULTIMATE.start__strcmp_~src#1.base|) (<= |ULTIMATE.start__strcmp_~src#1.offset| 0) (<= 0 |ULTIMATE.start__strcmp_#in~src#1.offset|) (<= 0 |ULTIMATE.start__strcmp_~dst#1.offset|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~x~0#1| 4))) |ULTIMATE.start_main_#t~mem8#1|) (<= 0 |ULTIMATE.start__strcmp_#in~src#1.base|) (<= 0 |ULTIMATE.start__strcmp_~src#1.offset|) (<= |ULTIMATE.start__strcmp_#in~dst#1.offset| 0) (<= |ULTIMATE.start__strcmp_#in~src#1.offset| 0) (< |ULTIMATE.start_main_~x~0#1| 100000) (<= |ULTIMATE.start__strcmp_~dst#1.offset| 0) (= |ULTIMATE.start_main_#t~mem9#1| (select (select |#memory_int| |ULTIMATE.start_main_~#b~0#1.base|) (+ |ULTIMATE.start_main_~#b~0#1.offset| (* |ULTIMATE.start_main_~x~0#1| 4)))) (<= 0 |ULTIMATE.start__strcmp_#in~dst#1.base|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 100000 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_main_~#b~0#1.base|) (<= 0 |#StackHeapBarrier|) (= (ite (= |ULTIMATE.start_main_#t~mem9#1| |ULTIMATE.start_main_#t~mem8#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 100000 |ULTIMATE.start__strcmp_~i~0#1|) (= |#NULL.base| 0))' at error location [2022-11-25 22:16:55,114 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 22:16:55,114 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 22:16:55,115 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [134, 134, 134] total 268 [2022-11-25 22:16:55,115 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [265434532] [2022-11-25 22:16:55,115 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 22:16:55,116 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 269 states [2022-11-25 22:16:55,116 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 22:16:55,124 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 269 interpolants. [2022-11-25 22:16:55,130 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36099, Invalid=40907, Unknown=0, NotChecked=0, Total=77006 [2022-11-25 22:16:55,130 INFO L87 Difference]: Start difference. First operand 341 states and 343 transitions. Second operand has 269 states, 269 states have (on average 1.0408921933085502) internal successors, (280), 268 states have internal predecessors, (280), 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) [2022-11-25 22:16:56,166 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 22:16:56,166 INFO L93 Difference]: Finished difference Result 682 states and 819 transitions. [2022-11-25 22:16:56,166 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 268 states. [2022-11-25 22:16:56,167 INFO L78 Accepts]: Start accepts. Automaton has has 269 states, 269 states have (on average 1.0408921933085502) internal successors, (280), 268 states have internal predecessors, (280), 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 340 [2022-11-25 22:16:56,167 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 22:16:56,169 INFO L225 Difference]: With dead ends: 682 [2022-11-25 22:16:56,169 INFO L226 Difference]: Without dead ends: 475 [2022-11-25 22:16:56,174 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1152 GetRequests, 876 SyntacticMatches, 0 SemanticMatches, 276 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4135 ImplicationChecksByTransitivity, 30.2s TimeCoverageRelationStatistics Valid=36099, Invalid=40907, Unknown=0, NotChecked=0, Total=77006 [2022-11-25 22:16:56,175 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 0 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 293 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 64 SdHoareTripleChecker+Invalid, 294 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 293 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-25 22:16:56,175 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 64 Invalid, 294 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 293 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-25 22:16:56,176 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 475 states. [2022-11-25 22:16:56,242 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 475 to 475. [2022-11-25 22:16:56,243 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 475 states, 474 states have (on average 1.0063291139240507) internal successors, (477), 474 states have internal predecessors, (477), 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) [2022-11-25 22:16:56,244 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 475 states to 475 states and 477 transitions. [2022-11-25 22:16:56,244 INFO L78 Accepts]: Start accepts. Automaton has 475 states and 477 transitions. Word has length 340 [2022-11-25 22:16:56,245 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 22:16:56,245 INFO L495 AbstractCegarLoop]: Abstraction has 475 states and 477 transitions. [2022-11-25 22:16:56,246 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 269 states, 269 states have (on average 1.0408921933085502) internal successors, (280), 268 states have internal predecessors, (280), 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) [2022-11-25 22:16:56,246 INFO L276 IsEmpty]: Start isEmpty. Operand 475 states and 477 transitions. [2022-11-25 22:16:56,249 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 475 [2022-11-25 22:16:56,249 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 22:16:56,249 INFO L195 NwaCegarLoop]: trace histogram [266, 94, 94, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 22:16:56,261 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-11-25 22:16:56,460 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:16:56,461 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 22:16:56,461 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 22:16:56,461 INFO L85 PathProgramCache]: Analyzing trace with hash 1279434622, now seen corresponding path program 11 times [2022-11-25 22:16:56,461 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 22:16:56,461 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1236173769] [2022-11-25 22:16:56,461 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 22:16:56,461 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 22:16:57,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:17:51,053 INFO L134 CoverageAnalysis]: Checked inductivity of 44373 backedges. 0 proven. 35511 refuted. 0 times theorem prover too weak. 8862 trivial. 0 not checked. [2022-11-25 22:17:51,053 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 22:17:51,054 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1236173769] [2022-11-25 22:17:51,054 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1236173769] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 22:17:51,054 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [849398255] [2022-11-25 22:17:51,054 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 22:17:51,054 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:17:51,055 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 22:17:51,059 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 22:17:51,079 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-11-25 22:17:57,115 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2022-11-25 22:17:57,115 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 22:17:57,126 INFO L263 TraceCheckSpWp]: Trace formula consists of 567 conjuncts, 61 conjunts are in the unsatisfiable core [2022-11-25 22:17:57,134 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 22:18:02,132 INFO L134 CoverageAnalysis]: Checked inductivity of 44373 backedges. 0 proven. 941 refuted. 0 times theorem prover too weak. 43432 trivial. 0 not checked. [2022-11-25 22:18:02,132 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 22:18:04,294 INFO L321 Elim1Store]: treesize reduction 15, result has 83.5 percent of original size [2022-11-25 22:18:04,294 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 36 treesize of output 83 [2022-11-25 22:18:06,383 INFO L134 CoverageAnalysis]: Checked inductivity of 44373 backedges. 89 proven. 852 refuted. 0 times theorem prover too weak. 43432 trivial. 0 not checked. [2022-11-25 22:18:06,383 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [849398255] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 22:18:06,383 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1151507333] [2022-11-25 22:18:06,385 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-25 22:18:06,385 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 22:18:06,385 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 22:18:06,386 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 22:18:06,386 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 22:18:06,401 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:18:06,403 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:18:06,434 INFO L321 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2022-11-25 22:18:06,435 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 53 [2022-11-25 22:18:06,444 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:18:06,445 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:18:06,446 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 8 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 27 [2022-11-25 22:18:06,467 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:18:06,468 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:18:06,469 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 8 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 57 treesize of output 45 [2022-11-25 22:18:06,527 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:18:06,528 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:18:06,530 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:18:06,531 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:18:06,535 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:18:06,538 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:18:06,540 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:18:06,573 INFO L321 Elim1Store]: treesize reduction 135, result has 12.9 percent of original size [2022-11-25 22:18:06,574 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 304 treesize of output 272 [2022-11-25 22:18:06,633 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:18:06,644 INFO L321 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2022-11-25 22:18:06,645 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 1 case distinctions, treesize of input 42 treesize of output 29 [2022-11-25 22:18:06,838 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 22:18:45,398 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '23534#(and (= |ULTIMATE.start__strcmp_#res#1| 0) (<= 0 |ULTIMATE.start__strcmp_#in~dst#1.offset|) (<= 0 |ULTIMATE.start__strcmp_~dst#1.base|) (<= 0 |ULTIMATE.start_main_~x~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (= |ULTIMATE.start_main_~#b~0#1.offset| 0) (<= 0 |ULTIMATE.start__strcmp_~src#1.base|) (<= |ULTIMATE.start__strcmp_~src#1.offset| 0) (<= 0 |ULTIMATE.start__strcmp_#in~src#1.offset|) (<= 0 |ULTIMATE.start__strcmp_~dst#1.offset|) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~x~0#1| 4))) |ULTIMATE.start_main_#t~mem8#1|) (<= 0 |ULTIMATE.start__strcmp_#in~src#1.base|) (<= 0 |ULTIMATE.start__strcmp_~src#1.offset|) (<= 0 |ULTIMATE.start_main_~c~0#1|) (<= |ULTIMATE.start__strcmp_#in~dst#1.offset| 0) (<= |ULTIMATE.start__strcmp_#in~src#1.offset| 0) (<= |ULTIMATE.start_main_~c~0#1| 0) (< |ULTIMATE.start_main_~x~0#1| 100000) (<= |ULTIMATE.start__strcmp_~dst#1.offset| 0) (= |ULTIMATE.start_main_#t~mem9#1| (select (select |#memory_int| |ULTIMATE.start_main_~#b~0#1.base|) (+ |ULTIMATE.start_main_~#b~0#1.offset| (* |ULTIMATE.start_main_~x~0#1| 4)))) (<= 0 |ULTIMATE.start__strcmp_#in~dst#1.base|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 100000 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_main_~#b~0#1.base|) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= (ite (= |ULTIMATE.start_main_#t~mem9#1| |ULTIMATE.start_main_#t~mem8#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 100000 |ULTIMATE.start__strcmp_~i~0#1|) (= |#NULL.base| 0))' at error location [2022-11-25 22:18:45,398 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 22:18:45,398 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 22:18:45,399 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [268, 16, 16] total 298 [2022-11-25 22:18:45,399 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [421252057] [2022-11-25 22:18:45,399 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 22:18:45,400 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 298 states [2022-11-25 22:18:45,400 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 22:18:45,408 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 298 interpolants. [2022-11-25 22:18:45,414 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36210, Invalid=57120, Unknown=0, NotChecked=0, Total=93330 [2022-11-25 22:18:45,414 INFO L87 Difference]: Start difference. First operand 475 states and 477 transitions. Second operand has 298 states, 298 states have (on average 1.1476510067114094) internal successors, (342), 298 states have internal predecessors, (342), 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) [2022-11-25 22:19:29,026 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 22:19:29,026 INFO L93 Difference]: Finished difference Result 688 states and 693 transitions. [2022-11-25 22:19:29,027 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 292 states. [2022-11-25 22:19:29,027 INFO L78 Accepts]: Start accepts. Automaton has has 298 states, 298 states have (on average 1.1476510067114094) internal successors, (342), 298 states have internal predecessors, (342), 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 474 [2022-11-25 22:19:29,028 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 22:19:29,030 INFO L225 Difference]: With dead ends: 688 [2022-11-25 22:19:29,030 INFO L226 Difference]: Without dead ends: 481 [2022-11-25 22:19:29,046 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1967 GetRequests, 1290 SyntacticMatches, 94 SemanticMatches, 583 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 79636 ImplicationChecksByTransitivity, 114.0s TimeCoverageRelationStatistics Valid=108426, Invalid=233214, Unknown=0, NotChecked=0, Total=341640 [2022-11-25 22:19:29,047 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 39 mSDsluCounter, 160 mSDsCounter, 0 mSdLazyCounter, 924 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 168 SdHoareTripleChecker+Invalid, 930 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 924 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-11-25 22:19:29,047 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [39 Valid, 168 Invalid, 930 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 924 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-11-25 22:19:29,048 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 481 states. [2022-11-25 22:19:29,144 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 481 to 479. [2022-11-25 22:19:29,145 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 479 states, 478 states have (on average 1.006276150627615) internal successors, (481), 478 states have internal predecessors, (481), 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) [2022-11-25 22:19:29,146 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 479 states to 479 states and 481 transitions. [2022-11-25 22:19:29,146 INFO L78 Accepts]: Start accepts. Automaton has 479 states and 481 transitions. Word has length 474 [2022-11-25 22:19:29,146 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 22:19:29,146 INFO L495 AbstractCegarLoop]: Abstraction has 479 states and 481 transitions. [2022-11-25 22:19:29,147 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 298 states, 298 states have (on average 1.1476510067114094) internal successors, (342), 298 states have internal predecessors, (342), 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) [2022-11-25 22:19:29,147 INFO L276 IsEmpty]: Start isEmpty. Operand 479 states and 481 transitions. [2022-11-25 22:19:29,149 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 479 [2022-11-25 22:19:29,149 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 22:19:29,149 INFO L195 NwaCegarLoop]: trace histogram [267, 94, 94, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 22:19:29,160 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2022-11-25 22:19:29,349 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:19:29,350 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 22:19:29,350 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 22:19:29,350 INFO L85 PathProgramCache]: Analyzing trace with hash -554107011, now seen corresponding path program 12 times [2022-11-25 22:19:29,350 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 22:19:29,351 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1375466917] [2022-11-25 22:19:29,351 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 22:19:29,351 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 22:19:30,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:20:25,369 INFO L134 CoverageAnalysis]: Checked inductivity of 44654 backedges. 0 proven. 35778 refuted. 0 times theorem prover too weak. 8876 trivial. 0 not checked. [2022-11-25 22:20:25,370 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 22:20:25,370 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1375466917] [2022-11-25 22:20:25,370 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1375466917] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 22:20:25,370 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1846726134] [2022-11-25 22:20:25,370 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 22:20:25,371 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:20:25,371 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 22:20:25,375 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 22:20:25,399 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-11-25 22:20:27,250 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 22:20:27,250 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 22:20:27,277 INFO L263 TraceCheckSpWp]: Trace formula consists of 5534 conjuncts, 96 conjunts are in the unsatisfiable core [2022-11-25 22:20:27,287 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 22:20:41,509 INFO L134 CoverageAnalysis]: Checked inductivity of 44654 backedges. 0 proven. 8836 refuted. 0 times theorem prover too weak. 35818 trivial. 0 not checked. [2022-11-25 22:20:41,510 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 22:21:03,010 INFO L134 CoverageAnalysis]: Checked inductivity of 44654 backedges. 0 proven. 8836 refuted. 0 times theorem prover too weak. 35818 trivial. 0 not checked. [2022-11-25 22:21:03,010 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1846726134] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 22:21:03,010 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [208334315] [2022-11-25 22:21:03,012 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-25 22:21:03,012 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 22:21:03,012 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 22:21:03,012 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 22:21:03,013 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 22:21:03,030 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:21:03,031 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:21:03,064 INFO L321 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2022-11-25 22:21:03,065 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 53 [2022-11-25 22:21:03,074 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:21:03,075 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:21:03,076 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 8 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 27 [2022-11-25 22:21:03,095 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:21:03,096 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:21:03,097 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 8 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 57 treesize of output 45 [2022-11-25 22:21:03,150 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:21:03,151 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:21:03,152 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:21:03,153 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:21:03,154 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:21:03,157 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:21:03,158 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:21:03,188 INFO L321 Elim1Store]: treesize reduction 135, result has 12.9 percent of original size [2022-11-25 22:21:03,188 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 304 treesize of output 272 [2022-11-25 22:21:03,245 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:21:03,256 INFO L321 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2022-11-25 22:21:03,257 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 1 case distinctions, treesize of input 42 treesize of output 29 [2022-11-25 22:21:03,449 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 22:21:48,546 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '29431#(and (= |ULTIMATE.start__strcmp_#res#1| 0) (<= 0 |ULTIMATE.start__strcmp_#in~dst#1.offset|) (<= 0 |ULTIMATE.start__strcmp_~dst#1.base|) (<= 0 |ULTIMATE.start_main_~x~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (= |ULTIMATE.start_main_~#b~0#1.offset| 0) (<= 0 |ULTIMATE.start__strcmp_~src#1.base|) (<= |ULTIMATE.start__strcmp_~src#1.offset| 0) (<= 0 |ULTIMATE.start__strcmp_#in~src#1.offset|) (<= 0 |ULTIMATE.start__strcmp_~dst#1.offset|) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~x~0#1| 4))) |ULTIMATE.start_main_#t~mem8#1|) (<= 0 |ULTIMATE.start__strcmp_#in~src#1.base|) (<= 0 |ULTIMATE.start__strcmp_~src#1.offset|) (<= 0 |ULTIMATE.start_main_~c~0#1|) (<= |ULTIMATE.start__strcmp_#in~dst#1.offset| 0) (<= |ULTIMATE.start__strcmp_#in~src#1.offset| 0) (<= |ULTIMATE.start_main_~c~0#1| 0) (< |ULTIMATE.start_main_~x~0#1| 100000) (<= |ULTIMATE.start__strcmp_~dst#1.offset| 0) (= |ULTIMATE.start_main_#t~mem9#1| (select (select |#memory_int| |ULTIMATE.start_main_~#b~0#1.base|) (+ |ULTIMATE.start_main_~#b~0#1.offset| (* |ULTIMATE.start_main_~x~0#1| 4)))) (<= 0 |ULTIMATE.start__strcmp_#in~dst#1.base|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 100000 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_main_~#b~0#1.base|) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= (ite (= |ULTIMATE.start_main_#t~mem9#1| |ULTIMATE.start_main_#t~mem8#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 100000 |ULTIMATE.start__strcmp_~i~0#1|) (= |#NULL.base| 0))' at error location [2022-11-25 22:21:48,546 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 22:21:48,547 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 22:21:48,547 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [269, 97, 97] total 460 [2022-11-25 22:21:48,547 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [436055080] [2022-11-25 22:21:48,547 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 22:21:48,548 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 460 states [2022-11-25 22:21:48,548 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 22:21:48,560 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 460 interpolants. [2022-11-25 22:21:48,573 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=54693, Invalid=163863, Unknown=0, NotChecked=0, Total=218556 [2022-11-25 22:21:48,574 INFO L87 Difference]: Start difference. First operand 479 states and 481 transitions. Second operand has 460 states, 460 states have (on average 1.4369565217391305) internal successors, (661), 460 states have internal predecessors, (661), 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) [2022-11-25 22:21:51,369 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 22:21:51,369 INFO L93 Difference]: Finished difference Result 882 states and 982 transitions. [2022-11-25 22:21:51,369 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 460 states. [2022-11-25 22:21:51,370 INFO L78 Accepts]: Start accepts. Automaton has has 460 states, 460 states have (on average 1.4369565217391305) internal successors, (661), 460 states have internal predecessors, (661), 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 478 [2022-11-25 22:21:51,370 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 22:21:51,372 INFO L225 Difference]: With dead ends: 882 [2022-11-25 22:21:51,373 INFO L226 Difference]: Without dead ends: 672 [2022-11-25 22:21:51,383 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1701 GetRequests, 1141 SyntacticMatches, 94 SemanticMatches, 466 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 106836 ImplicationChecksByTransitivity, 109.0s TimeCoverageRelationStatistics Valid=54693, Invalid=163863, Unknown=0, NotChecked=0, Total=218556 [2022-11-25 22:21:51,383 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 2 mSDsluCounter, 78 mSDsCounter, 0 mSdLazyCounter, 712 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 714 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 712 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-11-25 22:21:51,384 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 84 Invalid, 714 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 712 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-11-25 22:21:51,385 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 672 states. [2022-11-25 22:21:51,515 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 672 to 672. [2022-11-25 22:21:51,517 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 672 states, 671 states have (on average 1.0044709388971684) internal successors, (674), 671 states have internal predecessors, (674), 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) [2022-11-25 22:21:51,518 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 672 states to 672 states and 674 transitions. [2022-11-25 22:21:51,518 INFO L78 Accepts]: Start accepts. Automaton has 672 states and 674 transitions. Word has length 478 [2022-11-25 22:21:51,519 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 22:21:51,519 INFO L495 AbstractCegarLoop]: Abstraction has 672 states and 674 transitions. [2022-11-25 22:21:51,520 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 460 states, 460 states have (on average 1.4369565217391305) internal successors, (661), 460 states have internal predecessors, (661), 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) [2022-11-25 22:21:51,520 INFO L276 IsEmpty]: Start isEmpty. Operand 672 states and 674 transitions. [2022-11-25 22:21:51,525 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 672 [2022-11-25 22:21:51,525 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 22:21:51,526 INFO L195 NwaCegarLoop]: trace histogram [268, 190, 190, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 22:21:51,544 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2022-11-25 22:21:51,739 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:21:51,739 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 22:21:51,739 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 22:21:51,739 INFO L85 PathProgramCache]: Analyzing trace with hash -271906779, now seen corresponding path program 13 times [2022-11-25 22:21:51,740 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 22:21:51,740 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [458355554] [2022-11-25 22:21:51,740 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 22:21:51,740 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 22:21:52,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:23:02,474 INFO L134 CoverageAnalysis]: Checked inductivity of 72186 backedges. 0 proven. 36046 refuted. 0 times theorem prover too weak. 36140 trivial. 0 not checked. [2022-11-25 22:23:02,474 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 22:23:02,474 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [458355554] [2022-11-25 22:23:02,474 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [458355554] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 22:23:02,474 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1732020529] [2022-11-25 22:23:02,474 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-25 22:23:02,474 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:23:02,475 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 22:23:02,477 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 22:23:02,478 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-11-25 22:23:04,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:23:04,762 INFO L263 TraceCheckSpWp]: Trace formula consists of 6415 conjuncts, 270 conjunts are in the unsatisfiable core [2022-11-25 22:23:04,776 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 22:23:05,263 INFO L134 CoverageAnalysis]: Checked inductivity of 72186 backedges. 0 proven. 36046 refuted. 0 times theorem prover too weak. 36140 trivial. 0 not checked. [2022-11-25 22:23:05,264 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 22:24:34,977 INFO L134 CoverageAnalysis]: Checked inductivity of 72186 backedges. 0 proven. 36046 refuted. 0 times theorem prover too weak. 36140 trivial. 0 not checked. [2022-11-25 22:24:34,978 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1732020529] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 22:24:34,978 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1310512573] [2022-11-25 22:24:34,979 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-25 22:24:34,979 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 22:24:34,979 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 22:24:34,979 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 22:24:34,979 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 22:24:34,994 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:24:34,995 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:24:35,023 INFO L321 Elim1Store]: treesize reduction 37, result has 32.7 percent of original size [2022-11-25 22:24:35,024 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 34 [2022-11-25 22:24:35,034 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:24:35,036 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:24:35,070 INFO L321 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2022-11-25 22:24:35,071 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 53 [2022-11-25 22:24:35,090 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:24:35,091 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:24:35,092 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 8 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 35 [2022-11-25 22:24:35,152 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:24:35,153 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:24:35,156 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:24:35,156 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:24:35,157 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:24:35,225 INFO L321 Elim1Store]: treesize reduction 235, result has 16.4 percent of original size [2022-11-25 22:24:35,225 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 9 case distinctions, treesize of input 284 treesize of output 274 [2022-11-25 22:24:35,405 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:24:35,416 INFO L321 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2022-11-25 22:24:35,417 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 1 case distinctions, treesize of input 42 treesize of output 29 [2022-11-25 22:24:35,585 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 22:25:40,275 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '36590#(and (= |ULTIMATE.start_main_~c~0#1| 0) (= |ULTIMATE.start__strcmp_#res#1| 0) (<= 0 |ULTIMATE.start__strcmp_#in~dst#1.offset|) (<= 0 |ULTIMATE.start__strcmp_~dst#1.base|) (<= 0 |ULTIMATE.start_main_~x~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (= |ULTIMATE.start_main_~#b~0#1.offset| 0) (<= 0 |ULTIMATE.start__strcmp_~src#1.base|) (<= |ULTIMATE.start__strcmp_~src#1.offset| 0) (<= 0 |ULTIMATE.start__strcmp_#in~src#1.offset|) (<= 0 |ULTIMATE.start__strcmp_~dst#1.offset|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~x~0#1| 4))) |ULTIMATE.start_main_#t~mem8#1|) (<= 0 |ULTIMATE.start__strcmp_#in~src#1.base|) (<= 0 |ULTIMATE.start__strcmp_~src#1.offset|) (<= |ULTIMATE.start__strcmp_#in~dst#1.offset| 0) (<= |ULTIMATE.start__strcmp_#in~src#1.offset| 0) (< |ULTIMATE.start_main_~x~0#1| 100000) (<= |ULTIMATE.start__strcmp_~dst#1.offset| 0) (= |ULTIMATE.start_main_#t~mem9#1| (select (select |#memory_int| |ULTIMATE.start_main_~#b~0#1.base|) (+ |ULTIMATE.start_main_~#b~0#1.offset| (* |ULTIMATE.start_main_~x~0#1| 4)))) (<= 0 |ULTIMATE.start__strcmp_#in~dst#1.base|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 100000 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_main_~#b~0#1.base|) (<= 0 |#StackHeapBarrier|) (= (ite (= |ULTIMATE.start_main_#t~mem9#1| |ULTIMATE.start_main_#t~mem8#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 100000 |ULTIMATE.start__strcmp_~i~0#1|) (= |#NULL.base| 0))' at error location [2022-11-25 22:25:40,275 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 22:25:40,275 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 22:25:40,276 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [270, 270, 270] total 540 [2022-11-25 22:25:40,276 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1272852592] [2022-11-25 22:25:40,276 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 22:25:40,277 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 541 states [2022-11-25 22:25:40,278 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 22:25:40,304 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 541 interpolants. [2022-11-25 22:25:40,315 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=146113, Invalid=154739, Unknown=0, NotChecked=0, Total=300852 [2022-11-25 22:25:40,316 INFO L87 Difference]: Start difference. First operand 672 states and 674 transitions. Second operand has 541 states, 541 states have (on average 1.0203327171903882) internal successors, (552), 540 states have internal predecessors, (552), 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) [2022-11-25 22:25:46,105 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 22:25:46,105 INFO L93 Difference]: Finished difference Result 1344 states and 1617 transitions. [2022-11-25 22:25:46,107 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 540 states. [2022-11-25 22:25:46,107 INFO L78 Accepts]: Start accepts. Automaton has has 541 states, 541 states have (on average 1.0203327171903882) internal successors, (552), 540 states have internal predecessors, (552), 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 671 [2022-11-25 22:25:46,108 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 22:25:46,110 INFO L225 Difference]: With dead ends: 1344 [2022-11-25 22:25:46,111 INFO L226 Difference]: Without dead ends: 942 [2022-11-25 22:25:46,128 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2281 GetRequests, 1544 SyntacticMatches, 190 SemanticMatches, 547 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 160864 ImplicationChecksByTransitivity, 182.7s TimeCoverageRelationStatistics Valid=146113, Invalid=154739, Unknown=0, NotChecked=0, Total=300852 [2022-11-25 22:25:46,129 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 0 mSDsluCounter, 80 mSDsCounter, 0 mSdLazyCounter, 574 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 88 SdHoareTripleChecker+Invalid, 575 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 574 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-25 22:25:46,129 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 88 Invalid, 575 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 574 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-25 22:25:46,130 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 942 states. [2022-11-25 22:25:46,343 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 942 to 942. [2022-11-25 22:25:46,345 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 942 states, 941 states have (on average 1.0031880977683316) internal successors, (944), 941 states have internal predecessors, (944), 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) [2022-11-25 22:25:46,347 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 942 states to 942 states and 944 transitions. [2022-11-25 22:25:46,347 INFO L78 Accepts]: Start accepts. Automaton has 942 states and 944 transitions. Word has length 671 [2022-11-25 22:25:46,348 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 22:25:46,348 INFO L495 AbstractCegarLoop]: Abstraction has 942 states and 944 transitions. [2022-11-25 22:25:46,349 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 541 states, 541 states have (on average 1.0203327171903882) internal successors, (552), 540 states have internal predecessors, (552), 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) [2022-11-25 22:25:46,349 INFO L276 IsEmpty]: Start isEmpty. Operand 942 states and 944 transitions. [2022-11-25 22:25:46,358 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 942 [2022-11-25 22:25:46,358 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 22:25:46,359 INFO L195 NwaCegarLoop]: trace histogram [538, 190, 190, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 22:25:46,387 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2022-11-25 22:25:46,575 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f28ac09-22aa-471e-bc13-fcf8e25935b7/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2022-11-25 22:25:46,575 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 22:25:46,575 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 22:25:46,575 INFO L85 PathProgramCache]: Analyzing trace with hash -1021513435, now seen corresponding path program 14 times [2022-11-25 22:25:46,576 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 22:25:46,576 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1812853169] [2022-11-25 22:25:46,576 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 22:25:46,576 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 22:25:48,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat